CN216819525U - Motor rotor and self-starting synchronous reluctance motor and compressor thereof - Google Patents

Abstract

The utility model provides a motor rotor, a self-starting synchronous reluctance motor and a compressor thereof, wherein the motor rotor is provided with a slit groove, a second filling groove and a first filling groove on a first rotor punching sheet, an outer side magnetic barrier layer comprises the first filling groove, an inner side magnetic barrier layer comprises the slit groove and second filling grooves positioned at two ends of the slit groove, a partition rib is arranged between the second filling groove and the slit groove in the same layer, a second rotor punching sheet is arranged between an end ring and the first rotor punching sheet, a communicating groove is arranged on the second rotor punching sheet corresponding to the filling groove, the radial width between an inner hole and an outer circle of the second rotor punching sheet is different, and the radial width of a rotor blocking sheet on a d axis is larger than that on a q axis. According to the utility model, the radial width of the second rotor punching sheet on the q axis is smaller than that of the second rotor punching sheet on the d axis, so that slit grooves with enough areas can be directly contacted with air to form circulation holes, and the heat dissipation of the rotor is increased.

Description

Motor rotor and self-starting synchronous reluctance motor and compressor thereof

Technical Field

The utility model belongs to the technical field of motor design, and particularly relates to a motor rotor, a self-starting synchronous reluctance motor and a compressor thereof.

Background

The self-starting synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the synchronous reluctance motor, realizes self-starting through asynchronous torque generated by a rotor conducting bar, and does not need to be driven by a frequency converter. Compared with an asynchronous motor, the motor can realize constant-speed operation, the loss of a rotor is low, and the efficiency in synchronous operation is improved; compared with an asynchronous starting permanent magnet synchronous motor, the motor does not use permanent magnet materials, is low in cost and does not have the problem of demagnetization of permanent magnets. However, the self-starting synchronous reluctance motor has a problem that heat dissipation of the motor is difficult due to a multi-layer magnetic barrier layer structure of the motor.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a motor rotor, a self-starting synchronous reluctance motor thereof and a compressor, which can overcome the defect that the motor rotor of the self-starting synchronous reluctance motor in the related art has a multi-layer magnetic barrier layer structure, so that the heat dissipation of the motor is difficult.

In order to solve the problems, the utility model provides a motor rotor, which comprises a rotor core, wherein the rotor core comprises a first rotor punching sheet and a second rotor punching sheet, a filling groove and a slit groove are formed in the first rotor punching sheet, the filling groove comprises a second filling groove and a first filling groove, a plurality of magnetic barrier layers are arranged on the first rotor punching sheet at intervals along the q axis of the first rotor punching sheet, the plurality of magnetic barrier layers comprise two outer magnetic barrier layers and a plurality of inner magnetic barrier layers positioned between the two outer magnetic barrier layers, the outer magnetic barrier layers comprise first filling grooves, the inner magnetic barrier layers comprise slit grooves and second filling grooves positioned at two ends of the slit grooves, in the inner magnetic barrier layers, a dividing rib is arranged between the second filling groove and the slit grooves, the second rotor punching sheet is arranged between an end ring and the first rotor punching sheet, communication grooves are arranged on the second rotor punching sheet corresponding to the filling grooves, the radial widths of an inner hole of the second rotor punching sheet and the outer circle of the second rotor punching sheet are different in positions, and the radial width of the rotor blade on the d axis is larger than that on the q axis.

In some embodiments, the radial width kd1 of the second rotor sheet on the d axis and the radial width kq1 of the second rotor sheet on the q axis satisfy 1.1 ≦ kd1/kq1 ≦ 2.8.

In some embodiments, 1.2. ltoreq. kd1/kq 1. ltoreq.1.8.

In some embodiments, the total area of the slot slots on the first rotor sheet on the inner circumferential side of the inner hole of the second rotor sheet accounts for at least 20% of the total area of the motor flow hole.

In some embodiments, the total area of the slit grooves on the inner hole inner peripheral side of the second rotor punching sheet on the first rotor punching sheet accounts for 25% -40% of the total area of the motor flow hole.

In some embodiments, the maximum width of the outer profile of the second rotor sheet is no greater than the outer diameter of the first rotor sheet; and/or the axial thickness of the second rotor punching sheet is not less than that of the single first rotor punching sheet.

In some embodiments, the maximum width of the inner hole of the second rotor punching sheet on the q axis is not less than the maximum width of the inner hole of the second rotor punching sheet on the d axis, and the ratio of the maximum width of the inner hole of the second rotor punching sheet on the q axis to the maximum width of the inner hole of the second rotor punching sheet on the d axis is 1-1.5.

In some embodiments, the total area of the communication slots on the second rotor sheet is no greater than the total area of the fill slots provided on the first rotor sheet.

In some embodiments, the communication groove provided in the second rotor sheet is the same as the filling groove provided in the first rotor sheet, and the area of the single communication groove on the second rotor sheet is not greater than that of the single filling groove on the first rotor sheet.

In some embodiments, the width between the inner hole of the second rotor punching sheet and the communication groove along the d-axis direction is larger than the width of the dividing rib between the communication groove and the slit groove.

In some embodiments, the total area of the slot slots on the first rotor sheet located within the inner bore of the second rotor sheet accounts for at least 30% of the total area of the rotor slot slots.

In some embodiments, the total area of the slot slots on the first rotor sheet located within the inner bore of the second rotor sheet accounts for 45% to 65% of the total area of the rotor slot slots.

In some embodiments, the area of the slit groove in each layer of the magnetic barrier layer on the first rotor punching sheet located in the inner hole of the second rotor punching sheet gradually decreases from the rotor shaft hole side to the rotor outer circle side.

In some embodiments, the maximum width of the outer profile of the end ring is not greater than the maximum width of the outer profile of the second rotor sheet, and/or the maximum distance from the center of the rotor core to the end face of the end ring is not less than the maximum distance from the center of the rotor core to the end face of the second rotor sheet.

In some embodiments, the radial width between the end ring inner bore and the outer circle is k9 on the d-axis and k10 on the q-axis, 1.1 ≦ k9/k10 ≦ 2.8.

In some embodiments, 1.2 ≦ k9/k10 ≦ 1.8.

In some embodiments, a central point exists on an axial plane where the side edge of each of the dividing ribs close to the outer circle side of the rotor is located, the distance between two central points corresponding to two dividing ribs in any two adjacent magnetic barrier layers along the d-axis direction is L, the maximum distance between the magnetic conduction channels formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis direction is W, and L is greater than or equal to 0 and less than 2W.

In some embodiments, a central point exists on an axial plane where a side edge of each of the two dividing ribs close to the outer circle side of the rotor is located, the distance between two central points corresponding to two dividing ribs in any two adjacent magnetic barrier layers along the direction of the d axis is L, the width of an air gap formed between the inner diameter of the stator and the outer diameter of the rotor is sigma, and L is greater than or equal to 0 and less than 8 sigma.

In some embodiments, the width of the dividing rib of the outermost magnetic barrier layer close to the outer circle side of the rotor along the d-axis direction is L1, the width of the dividing rib of the innermost magnetic barrier layer close to the shaft hole side along the d-axis direction is L2, L1 is not less than L2, L1 is not less than 0.5 sigma, and sigma is the width of the air gap between the stator and the rotor.

In some embodiments, in the first quadrant of the dq axes, the distance between the center of the division rib and the d-axis and the q-axis satisfies kq ═ ν kd + λ, kq is the distance between the center of the division rib and the q-axis, kd is the distance between the center of the division rib and the d-axis, ν ≦ 0.28 ≦ 0.46, λ ≦ 28 ≦ 33.

In some embodiments, the width of the slot in the q-axis decreases continuously by at least 3 layers in a direction away from the d-axis; and/or the ratio of the sum of the widths of all the slit grooves and the first filling grooves in the q axis (d1+ ∑ d2) to the width d3 of the shaft hole to the outer circumference of the rotor is 0.2-0.5, wherein d1 is the width of the first filling groove in the q axis, and d2 is the width of the slit groove in the q axis.

In some embodiments, the minimum width W1 of the magnetic conduction channel between two adjacent filling grooves, W1 ≧ d, d is the minimum width of the magnetic conduction channel formed between the slit grooves corresponding to the two filling grooves

In some embodiments, the minimum distance h1 of the magnetic conduction channel between two adjacent magnetic barrier layers along the q-axis direction should satisfy h1 ≧ 1.5h2, and h2 is the minimum width along the q-axis direction of the magnetic barrier layer with the smaller width along the q-axis direction in the two adjacent magnetic barrier layers.

In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel on the q axis gradually decreases towards the direction away from the d axis.

In some embodiments, the width of each magnetic conduction channel on the q axis is continuously reduced by at least three layers towards the direction far away from the d axis, and/or the magnetic conduction channel is formed between two adjacent magnetic barrier layers, and for the magnetic conduction channel consisting of the arc line segment and the straight line segment, the width of the magnetic conduction channel is gradually increased from the q axis to two sides of the q axis.

In some embodiments, the ratio of the width of the slit groove in the q-axis to the width of the slit groove near the end of the filling groove in each of the barrier layers is τ 1, and τ 1 gradually increases from the innermost barrier layer to the outermost barrier layer.

In some embodiments, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove on the q-axis in each layer of the magnetic barrier layer is τ 2, and τ 2 > 1.4.

In some embodiments, in the outer layer magnetic barrier layer near the outer circle side of the rotor, the width in the d-axis direction between the end portions of the two second filling grooves at both ends of the slit groove on the side near the slit groove is k 3; in the inner layer magnetic barrier layer adjacent to the inner layer magnetic barrier layer and close to the shaft hole side, the width between the end parts of two second filling grooves at two ends of the slit groove and close to the slit groove side along the d-axis direction is k4, and then 0.5-k 3/k 4-1 or 0.5-k 4/k 3-1.

In some embodiments, in the outermost magnetic barrier layer on the outer circumferential side of the rotor, the width in the d-axis direction between the ends on the slit groove side of the two second filling grooves located at both ends of the slit groove is k 5; in the innermost magnetic barrier layer close to the rotor shaft hole side, the width between the end parts of two second filling grooves at two ends of the slit groove close to the slit groove side along the d-axis direction is k6, and then 0.5-k 5/k 6-1 or 0.5-k 6/k 5-1.

In some embodiments, the first filling groove is located in a q-axis direction of the outer periphery of the rotor, has a segmented structure, and is composed of a plurality of q-axis filling grooves, and ribs are arranged between every two adjacent q-axis filling grooves.

In some embodiments, the first filled trench has a number of ribs of y, 1 ≦ y ≦ 4.

In some embodiments, the width of the rib between any two adjacent q-axis filling grooves along the d-axis direction is L3, L3 > 0.1M1, L3 > 0.1M2, L3 > 0.05(M1+ M2), and M1 and M2 are the maximum widths of the any two adjacent q-axis filling grooves along the d-axis direction, respectively.

In some embodiments, the sum of the widths of the ribs between any two adjacent q-axis filling grooves in the d-axis direction is Σ L3, Σ L3 > 0.1 Σ (M1+ M2), Σ (M1+ M2) is the sum of the widths of the q-axis filling grooves in the d-axis direction.

In some embodiments, the width difference between the ribs is within ± 20%; and/or the minimum value L3 of the width of each rib is required to satisfy L3 ≧ sigma, which is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

In some embodiments, the difference in area of each q-axis filled slot is within ± 30%.

In some embodiments, the included angle between the two ends of the first filling groove and the connecting line of the center of the rotor is alpha 1, and alpha 1 is more than or equal to 20 degrees and less than or equal to 60 degrees.

In some embodiments, the filling trench has a length extending in a direction that is not more than 5% angularly offset from the parallel to the d-axis.

In some embodiments, a width of the first filling groove in the d-axis direction is smaller than a width in the d-axis direction between end portions of two second filling grooves in adjacent magnetic barrier layers on a side close to the slit groove.

In some embodiments, the ratio of the distance k12 from the rotor center in the q-axis direction to the rotor radius Rr of the first filling groove satisfies 0.82 ≦ k12/Rr ≦ 0.96.

In some embodiments, the ratio of the distance of the side edges of the two innermost magnetic barrier layers close to the shaft hole side on the q axis to the width of the rotating shaft on the q axis is more than 1.2; and/or the ratio of the diameter of an arc line segment of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q axis is larger than 2.

In some embodiments, the maximum thickness of the first filling groove along the q-axis direction is k, the maximum thickness of the second filling groove in the magnetic barrier layer adjacent to the first filling groove along the q-axis direction is k1, and the minimum thickness of the magnetic conduction channel connected with the second filling groove along the q-axis direction is k2, so that the thickness is 1 & lt k/k1 & lt 2, and 0.8 & lt k/k2 & lt 1.6.

In some embodiments, the interval between the filling groove of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is h3, the interval between the outermost magnetic barrier layer close to the outer circle side of the rotor and the outer circle of the rotor is h4, then h4 is more than or equal to h3, 0 is more than or equal to h3 and less than or equal to 2.5 sigma, and sigma is the width of an air gap between the inner diameter of the stator and the outer diameter of the rotor.

In some embodiments, the maximum width in the q-axis direction of the end portion of the filling groove near the outer circumferential side of the rotor is not greater than the maximum width in the q-axis direction of the region of the filling groove near the q-axis of the rotor.

In some embodiments, the width of the filling groove in the q-axis direction deviates by no more than 5% from the outer circumferential side of the rotor to the q-axis of the rotor.

In some embodiments, the first rotor sheet has at least five filling grooves with different filling areas; and/or the total filling area of the first filling groove and the second filling groove accounts for 30-70% of the total area of the first filling groove, the second filling groove and the slit groove.

In some embodiments, the ratio τ of the maximum value and the minimum value of the thicknesses in the q-axis direction of all the filled grooves satisfies 1 ≦ τ ≦ 2.

In some embodiments, the width of each second filling groove in the direction of the d axis gradually increases toward the direction of the d axis.

In some embodiments, the maximum width of each second filling groove along the direction of the d axis increases continuously in at least three layers towards the direction close to the d axis; and/or the maximum width of each second filling groove along the direction of the d axis is continuously reduced from the inner magnetic barrier layer of the second layer close to the d axis to the magnetic barrier layer close to the outer circle side of the rotor in the direction far away from the d axis.

In some embodiments, the grooves of at least part of the first filling grooves and the second filling grooves are filled with conductive and non-conductive materials, the filling grooves are connected in a self-short circuit mode through end rings at two ends of the second rotor punching sheet to form a squirrel cage structure, and the end rings are made of the same materials as the filling materials in the filling grooves.

In some embodiments, the slit groove consists of arc line segments and/or straight line segments, the radian of the arc line segments of the slit groove is gradually increased from the axial hole side of the rotor to the excircle side of the rotor, the radian of the outer arc of the slit groove on the same layer is greater than that of the inner arc, and the arc line segments protrude towards the side far away from the axial hole; or the two ends of the slit groove extend along the direction of the d axis to form straight line segments, the two ends of part or all of the slit groove are parallel to the d axis, and the width of the slit groove is gradually increased from the middle position of the slit groove to the two ends.

In some embodiments, the curve length between the end parts of each layer of slit grooves close to the two second filling grooves gradually decreases from the rotor shaft hole side to the rotor excircle side, and the curve length decreasing proportion of the adjacent slit grooves is 5% -25%; and/or the maximum width of the shaft hole in the q-axis direction is not greater than the maximum width of the shaft hole in the d-axis direction.

The utility model also provides a self-starting synchronous reluctance motor which comprises the motor rotor.

The utility model also provides a compressor which comprises the self-starting synchronous reluctance motor.

According to the motor rotor and the self-starting synchronous reluctance motor and the compressor thereof, the q-axis direction of the second rotor punching sheet corresponds to the slit groove of the first rotor punching sheet, the radial width of the second rotor punching sheet on the q-axis is smaller than that on the d-axis, so that the slit grooves with enough area can be directly contacted with air to form circulation holes, and the heat dissipation of the rotor is increased.

Drawings

FIG. 1 is a schematic perspective view of a rotor of an electric machine according to an embodiment of the present invention

Fig. 2 is a schematic structural view (axial direction) of a first rotor sheet of a motor rotor according to an embodiment of the present invention;

fig. 3 is a schematic structural view (axial direction) of a second rotor sheet of the motor rotor according to the embodiment of the present invention;

FIG. 4 is a schematic structural view (axial direction) of an electronic rotor according to an embodiment of the present invention;

fig. 5 is a schematic structural view (axial direction) of a first rotor sheet of a motor rotor according to another embodiment of the present invention;

fig. 6 is a schematic structural view (axial direction) of a second rotor punching of a motor rotor according to another embodiment of the present invention;

fig. 7 is a schematic structural view (axial direction) of an electronic rotor according to another embodiment of the present invention;

fig. 8 is a comparison of temperature rise, loss, and efficiency of a motor using the technical solution of the present invention and a motor in the prior art.

The reference numerals are represented as:

2. a second rotor sheet; 21. a communicating groove; 3. an end ring; 4. a first rotor sheet; 51. a first filling groove; 511. q-axis filling grooves; 52. a second filling groove; 6. a slit groove; 7. a shaft hole; 8. cutting ribs; 9. and (5) ribs.

Detailed Description

Referring to fig. 1 to 8 in combination, according to an embodiment of the present invention, the present invention provides a self-starting synchronous reluctance motor rotor, which can increase the area of the rotor directly contacting air, form circulation holes, and increase the heat dissipation of the rotor by the special design of a rotor core.

The specific implementation is described below by taking the rotor as an example in conjunction with the accompanying drawings, and fig. 1 is a schematic view of a rotor of an electric machine, which includes a first rotor punching sheet 4, a second rotor punching sheet 2, and an end ring 3. Fig. 2 shows a first rotor sheet 4 according to a first embodiment, the first rotor sheet 4 is provided with a filling groove, a slit groove 6 and a shaft hole 7, and the filling groove 5 includes a first filling groove 51 and a second filling groove 52. The radial width between different positions of the inner hole of the second rotor punching sheet 2 and the excircle, namely the distance between the connecting line of the rotor center and the rotor excircle and two points where the inner hole of the second rotor punching sheet 2 intersects with the excircle, is unequal, and the radial width of the second rotor punching sheet 2 on the d axis is greater than the radial width of the second rotor punching sheet 2 on the q axis. The q-axis direction of the second rotor punching sheet 2 corresponds to the slit groove 6 of the first rotor punching sheet 4, and the radial width of the second rotor punching sheet 2 on the q-axis is smaller than that on the d-axis, so that the slit grooves 6 with enough areas are in direct contact with air to form circulation holes, and the heat dissipation of the rotor is increased. As shown in fig. 8, the temperature rise, loss and efficiency of the motor of the present invention is compared with those of the prior art, and it can be seen that the temperature rise of the motor is low in the present invention, which further reduces the copper and aluminum consumption and improves the motor efficiency.

In some embodiments, the radial width kd1 of the second rotor punching sheet 2 on the d axis and the radial width kq1 of the second rotor punching sheet 2 on the q axis satisfy 1.1 ≦ kd1/kq1 ≦ 2.8, and more preferably 1.2 ≦ kd1/kq1 ≦ 1.8. The ratio of the d-axis radial width to the q-axis radial width of the second rotor punching sheet 2 is limited, so that on one hand, the radial thickness of the end ring 3 and further the starting capability of the motor cannot be influenced due to the fact that kd1 is too small, and on the other hand, the area of the slot 6 in direct contact with air cannot be influenced due to the fact that kd1 is too large, and the heat dissipation of the rotor cannot be influenced.

In some embodiments, the total area of the slit grooves 6 on the first rotor punching sheet 4 located inside the inner hole of the second rotor punching sheet 2 accounts for at least 20% of the total area of the motor flow holes (stator flow holes, rotor flow holes), and more preferably, the ratio is 25% to 40%. The total area of the slit grooves 6 in the inner hole of the second rotor punching sheet 2 is limited, so that enough areas of the slit grooves 6 are ensured to be in direct contact with air, and the heat dissipation of the rotor is further improved.

In some embodiments, the maximum width of the outer profile of the second rotor sheet 2 is not greater than the diameter of the outer circle of the first rotor sheet 4. The second rotor punching sheet 2 is used as a part of the rotor, the outer contour of the second rotor punching sheet is not larger than the outer circle of the first rotor punching sheet 4, and an air gap with a certain width is formed between the second rotor punching sheet and the stator.

In some embodiments, the maximum width of the inner hole of the second rotor punching sheet 2 on the q axis is not less than the maximum width of the inner hole of the second rotor punching sheet 2 on the d axis, and the ratio of the maximum width of the inner hole of the second rotor punching sheet 2 on the q axis to the maximum width of the inner hole of the second rotor punching sheet 2 on the d axis is 1-1.5. The maximum width of the inner hole of the second rotor punching sheet 2 on the q axis is not less than the maximum width of the inner hole on the d axis, so that slit grooves 6 with enough areas are in direct contact with air to form circulation holes, and the heat dissipation of the rotor is increased; and the ratio of the maximum width of the inner hole q axis of the second rotor punching sheet 2 to the maximum width of the inner hole d axis is limited so as to further ensure that the slit grooves 6 with enough areas are in direct contact with air.

In some embodiments, the thickness of the second rotor punching sheet 2 in the laminating direction of the first rotor punching sheets 4 is not less than that of the single first rotor punching sheets 4, so as to ensure the mechanical strength of the rotor.

In some embodiments, the total area of the communication grooves 21 on the second rotor punching sheet 2 is not greater than the total area of the filling grooves provided on the first rotor punching sheet 4. The communicating groove 21 in the second rotor punching sheet 2 is an inlet for filling the filling groove in the first rotor punching sheet 4 with the material, and the communicating groove 21 is formed in the second rotor punching sheet 2 so that the filling material can enter the filling groove in the first rotor punching sheet 4; the total area of the communication groove 21 on the second rotor punching sheet 2 is not larger than the total area of the filling groove arranged on the first rotor punching sheet 4, the stress area of the non-filling groove part of the first rotor punching sheet 4 can be reduced when the material is filled, the mechanical strength of the first rotor punching sheet in the material filling process is ensured, and the deformation is reduced.

In some embodiments, the communication groove 21 provided in the second rotor punching sheet 2 and the filling groove provided in the first rotor punching sheet 4 are located at the same position, and the area of the single communication groove 21 on the second rotor punching sheet 2 is not greater than that of the single filling groove on the first rotor punching sheet 4, so as to reduce local deformation of the first rotor punching sheet 4 when filling material.

In some embodiments, the width between the inner hole of the second rotor sheet 2 and the communication groove 21 in the d-axis direction should be greater than the width of the dividing rib 8 between the communication groove 21 and the slit groove 6, so as to ensure that the slit groove 6 is not filled during the manufacturing process of the rotor.

In some embodiments, the total area of the slit grooves 6 in the inner hole of the second rotor punching sheet 2 on the first rotor punching sheet 4 accounts for at least 30% of the total area of the slit grooves 6 of the rotor, and more preferably, the ratio is 45% to 65%, so as to ensure that enough areas of the slit grooves 6 directly contact with air to form circulation holes, and the heat dissipation of the rotor is increased.

In some embodiments, the area of the slit groove 6 in each layer of the magnetic barrier layer on the first rotor punching sheet 4 within the inner hole of the second rotor punching sheet 2 gradually decreases from the rotor shaft hole side to the rotor outer circle side. At this time, the end ring 3 has a certain thickness along the q-axis direction at the position of the magnetic barrier layer close to the outer circle side of the rotor, so that the end ring 3 can be ensured to have a certain volume to improve the starting capability of the motor.

In some embodiments, the maximum width of the outer contour of the end ring 3 is not greater than the maximum width of the outer contour of the second rotor punching 2, and the maximum distance from the center of the rotor core to the end face of the end ring 3 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor punching 2. The maximum width of the outer contour of the end ring 3 is not greater than that of the outer contour of the second rotor punching 2, so that the part, which is not covered by the second rotor punching 2, of the first rotor punching 4, located on the outer circle side of the rotor, is stressed when materials are filled, and local deformation is reduced; the maximum distance from the center of the rotor core to the end face of the end ring 3 is not less than the maximum distance from the center of the rotor core to the end face of the second rotor punching sheet 2, the end ring 3 with a certain volume of the rotor is guaranteed, and the starting capability of the motor is improved.

In some embodiments, the radial width between the inner bore and the outer circle of the end ring 3 is k9 on the d-axis and k10 on the q-axis, then 1.1. ltoreq. k9/k 10. ltoreq.2.8, more preferably 1.2. ltoreq. k9/k 10. ltoreq.1.8. The inner-layer filling groove close to the shaft hole side has larger width along the d-axis direction, and in order to enable the filling groove to be self-short-circuited, the radial width of the end ring 3 along the d-axis direction is larger; in order to secure an area of the slit groove 6 directly contacting the air, the radial width of the end ring 3 in the d-axis direction cannot be excessively large.

In some embodiments, in each magnetic barrier layer structure composed of the second filling groove 52 and the slit groove 6, the dividing rib 8 is present between the second filling groove 52 and the slit groove 6. A central point is arranged on an axial plane where the side edge of the segmentation rib 8 close to the outer circle side of the rotor is located, the distance between two central points corresponding to two segmentation ribs 8 in any two adjacent magnetic barrier layers along the d-axis direction is L, the maximum distance between the magnetic conduction channels formed between the filling grooves in the two adjacent magnetic barrier layers along the q-axis direction is W, then L is equal to or greater than 0 and less than 2W, more preferably, L is equal to or greater than 0 and less than W, and most preferably, L is equal to or greater than 0 and less than 0.8W. The minimum distance between the rotor filling grooves is limited, on one hand, the saturation of the magnetic conduction channels between the filling grooves can be reduced, on the other hand, the relative positions of the magnetic conduction channels and the stator teeth can be staggered, so that the harmonic waves of the motor can be reduced, the torque pulsation is reduced, the harmonic loss is reduced, and the efficiency and the running stability of the motor are improved.

It should be noted that the central point is a geometric central point of an axial plane where a side edge of the dividing rib 8 close to the outer circle of the rotor is located, as shown in fig. 2, the plane is a parallelogram plane extending along the axial direction of the first rotor sheet 4, the geometric central point of the parallelogram plane is also an intersection of diagonals of the parallelogram plane, and after the projection in the axial direction of the first rotor sheet 4, the geometric central point is a middle point of a length of the side edge of the dividing rib 8 close to the outer circle of the rotor.

In some embodiments, a central point exists on an axial plane where a side edge of the dividing rib 8 close to one side of the outer circle of the rotor is located, a distance between two central points corresponding to two dividing ribs 8 in any two adjacent magnetic barrier layers along the d-axis direction is L, and a width of an air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, then L should satisfy 0 < L < 8 σ, and more preferably, L is greater than or equal to 0 and less than or equal to 6 σ. The segmentation ribs 8 can enhance the mechanical strength of the rotor, reduce the deformation of the rotor in the manufacturing process and reduce the process difficulty. The relative distance of the segmentation ribs 8 between each filling groove and the slit groove 6 of the rotor is limited, the area of bearing pressure between two adjacent magnetic barrier layers can be increased, the effect of mutual support is formed, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In some embodiments, the width of the dividing rib 8 of the outermost magnetic barrier layer close to the outer circle side of the rotor along the d-axis direction is L1, the width of the dividing rib 8 of the innermost magnetic barrier layer close to the shaft hole side along the d-axis direction is L2, L1 is not less than L2, L1 is not less than 0.5 sigma, and sigma is the width of the air gap between the stator and the rotor. The minimum width of the segmentation ribs 8 is limited, so that the processing difficulty can be reduced, and the mechanical strength of the rotor is improved; l1 is more than or equal to L2, the magnetic flux leakage of the inner layer magnetic barrier layer can be reduced, and the motor efficiency is improved.

In some embodiments, the plane where the side surface of the split rib 8 is located is parallel to or intersects with the plane where the q-axis is located, that is, the shape of the split rib 8 is not limited to be rectangular, trapezoidal or arc, and the structure of the split rib 8 can be flexibly selected according to the trend of the magnetic leakage force line, so as to reduce magnetic leakage.

In some embodiments, in the first quadrant of the dq axis, the distance between the center of the division rib 8 and the d axis and the q axis satisfies- ν kd + λ, wherein kq is the distance between the center of the division rib 8 and the q axis, kd is the distance between the center of the division rib 8 and the d axis, ν satisfies 0.28 ≦ ν ≦ 0.46 (dimensionless), and λ satisfies 28 ≦ λ ≦ 33 (dimensions are consistent with kq and kd), so as to define the position and width of the division rib 8 and reduce the risk of deformation of the rotor.

In some embodiments, the width of the slit groove 6 in the q-axis decreases continuously by at least 3 layers in a direction away from the d-axis; the ratio of the sum of the widths of all the slit grooves 6 and the first filling grooves 51 in the q axis (d1+ ∑ d2) to the width d3 of the shaft hole 7 to the outer circumference of the rotor is 0.2 to 0.5, i.e., (d1+ ∑ d2)/d3 is 0.2 to 0.5, and more preferably, the ratio is 0.3 to 0.4, where d1 is the width of the first filling groove 51 in the q axis and d2 is the width of the slit groove in the q axis. The purpose is to select reasonable magnetic barrier to account for than, has both guaranteed sufficient magnetic barrier width, guarantees reasonable magnetic flow channel again, when increasing the motor salient pole ratio, prevents that the magnetic circuit from oversaturating.

In some embodiments, the minimum width W1 of the magnetic conduction channel between two adjacent filling grooves should satisfy W1 ≧ d, which is the minimum width of the magnetic conduction channel formed between the slit grooves 6 corresponding to the two filling grooves; more preferably, W1/d > 1.15. The purpose is to ensure that enough width is left between the filling grooves, and avoid magnetic field saturation from occurring and influencing the magnetic flux circulation of the channels between the magnetic barrier layers.

In some embodiments, the minimum distance h1 of the magnetic conduction channel between two adjacent magnetic barrier layers along the q-axis direction should satisfy h1 ≧ 1.5h2, and h2 is the minimum width along the q-axis direction of the magnetic barrier layer with the smaller width along the q-axis direction in the two adjacent magnetic barrier layers. The rotor processing difficulty can be reduced by the arrangement, and the uniformity and the unsaturation degree of the magnetic density distribution of the rotor are ensured.

In some embodiments, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel on the q axis is approximately gradually reduced towards the direction away from the d axis; more preferably, the width of each magnetic conduction channel on the q axis is continuously reduced by at least 3 layers in the direction away from the d axis. The effect of the magnetic conduction channel and the stator which are closer to the shaft hole 7 is larger, and the influence on the performance of the motor is larger. This setting guarantees to be close to shaft hole side guide magnetic channel width on the basis of rational utilization rotor space, helps promoting motor performance. And a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conduction channel consisting of the arc line sections and the straight line sections is gradually increased from the q axis to two sides of the q axis (the width of the magnetic conduction channel is defined as the shortest distance from each point on one side edge of the two side edges of the magnetic conduction channel to the other side edge). The width of the magnetic conduction channel defined herein is the cross-sectional width of the magnetic line of force passing on the rotor, thus being beneficial to reducing the magnetic density saturation degree of the rotor and reducing the loss of the motor.

In some embodiments, the ratio of the width of the slit groove 6 in the q-axis to the width of the slit groove 6 near the end of the filling groove in each of the magnetic barrier layers is τ 1, and τ 1 is generally gradually increased from the innermost magnetic barrier layer to the outermost magnetic barrier layer. The width of a magnetic conduction channel between the inner magnetic barrier layers is ensured, the proportion of the magnetic barrier layers is ensured, and the performance of the motor is improved. In each layer of magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove 6 on the q-axis is tau 2, tau 2 is greater than 1.4, preferably 1.5 < tau 2 < 3.0. Limiting the ratio to ensure that the filling groove has a certain width to increase the arrangement area; limiting the range of this ratio also ensures that the width of the magnetic conduction path between the filled slots is maintained.

In some embodiments, in the outer layer barrier layer on the outer circumferential side of the rotor, the width in the d-axis direction between the end portions on the side close to the slit groove 6 of the two second filling grooves 52 located at both ends of the slit groove 6 is k 3; in the inner layer magnetic barrier layer adjacent to the inner layer magnetic barrier layer on the side close to the shaft hole, the width between the end parts of the two second filling grooves 52 at the two ends of the slit groove 6 on the side close to the slit groove 6 along the d-axis direction is k4, and then 0.5 is not less than k3/k4 is not more than 1 or 0.5 is not less than k4/k3 is not more than 1. Under the condition of being limited by the rotor space, the arrangement can increase the area of the filling groove and improve the starting capability of the motor.

In some embodiments, in the outermost magnetic barrier layer on the rotor outer circumferential side, the width in the d-axis direction between the end portions on the slit groove 6 side of the two second filling grooves 52 located at both ends of the slit groove 6 is k 5; in the innermost magnetic barrier layer close to the rotor shaft hole side, the width along the d-axis direction between the end parts of the two second filling grooves 52 at the two ends of the slit groove 6 close to the slit groove 6 is k6, and then 0.5 is not less than k5/k6 is not more than 1 or 0.5 is not less than k6/k5 is not more than 1. Under the condition of being limited by the rotor space, the arrangement can increase the area of the filling groove and improve the starting capability of the motor.

In some embodiments, the first filling groove 51 is located in the q-axis direction of the rotor outer periphery, has a segmented structure, and is composed of a plurality of q-axis filling grooves 511, and the rib 9 is present between each two adjacent q-axis filling grooves 511. The first filling grooves 51 have the number y of the ribs 9, and y satisfies 1. ltoreq. y.ltoreq.4. The outermost magnetic barrier layer composed of the first filling grooves 51 near the outer circumferential side of the rotor is the most easily deformable portion of the rotor, and the deformation of the rotor at this position can be reduced by dividing the outermost first filling grooves 51 into a plurality of q-axis filling grooves 511.

In some embodiments, the width of the rib 9 between any two adjacent q-axis filling grooves 511 along the d-axis direction is L3, then L3 should satisfy L3 > 0.1M1, L3 > 0.1M2, L3 > 0.05(M1+ M2), and M1 and M2 are the maximum widths of the any two adjacent q-axis filling grooves 511 along the d-axis direction. The maximum width of the q-axis filling groove 511 along the d-axis direction is limited, so that the saturation of a channel between outer magnetic barrier layers of the rotor can be reduced, the harmonic wave of the motor can be reduced, the torque pulsation can be reduced, the harmonic wave loss can be reduced, and the efficiency and the running stability of the motor can be improved; and meanwhile, the width of the rib 9 between the q-axis filling grooves 511 is limited, so that the stress area of the outermost magnetic barrier layer of the rotor can be ensured, the mechanical strength of the rotor is further enhanced, the deformation of the rotor in the manufacturing process is reduced, and the process difficulty is reduced.

In some embodiments, the sum of the widths of the ribs 9 between any two adjacent q-axis filling grooves 511 in the d-axis direction is Σ L3 (the values of each L3 are equal or unequal), and Σ L3 > 0.1 Σ (M1+ M2), and Σ (M1+ M2) is the sum of the widths of each q-axis filling groove 511 in the d-axis direction. So configured, the mechanical strength of the rotor may be ensured in some embodiments.

In some embodiments, the width difference between the ribs 9 is within ± 20%, and the minimum value L3 of the width of each rib 9 should satisfy L3 ≧ σ, which is the width of the air gap between the stator inner diameter and the rotor outer diameter, to reduce local deformation of the rotor at the outermost magnetic barrier layer.

In some embodiments, the widths of different portions of the same rib 9 in the direction of the d-axis are equal or unequal, i.e., the shape of the rib 9 is not limited to be rectangular or trapezoidal or arc. The same rib 9 may be provided with a larger width in the d-axis direction at a portion where the risk of local deformation is large, and may be provided with a smaller width in the d-axis direction at a portion where the risk of local deformation is small.

In some embodiments, the difference in area of each q-axis filled trench 511 is within ± 30%, and more preferably, the difference in area of each q-axis filled trench 511 is within ± 15%. The arrangement ensures that the area difference of pressure bearing at each position of the outermost magnetic barrier layer is not large, and local deformation is avoided.

In some embodiments, the included angle α 1 between the two ends of the first filling groove 51 and the connecting line of the rotor center should satisfy 20 ° ≦ α 1 ≦ 60 °, more preferably, α 1 should satisfy 30 ° ≦ α 1 ≦ 50 °, and most preferably, α 1 should satisfy 30 ° ≦ α 1 ≦ 35 °. By the arrangement, the magnetic barrier layer is formed and serves as a filling groove, so that the magnetic barrier layer can be used as the magnetic barrier layer to increase the reluctance torque of the motor, and can also be used as a starting squirrel cage for improving the starting performance of the motor.

In some embodiments, the filled trenches, including the first filled trench 51 and the second filled trench 52, extend approximately parallel to the d-axis with an angular deviation of no more than 5%. Extending in a direction parallel to the d-axis to form a smooth magnetic conduction channel with the adjacent magnetic barrier layers.

In some embodiments, the width of the first filling groove 51 in the d-axis direction is smaller than the width in the d-axis direction between the end portions of the two second filling grooves 52 in the magnetic barrier layers adjacent thereto on the side close to the slit groove 6. This is provided for the purpose of limiting the width of the first filling groove 51 in the d-axis direction to avoid deformation of the rotor toward the axial hole side or toward the outer circle side due to an excessively large width.

In some embodiments, the ratio of the distance k12 from the rotor center in the q-axis direction of the first filling groove 51 to the rotor radius Rr satisfies 0.82. ltoreq. k 12/Rr. ltoreq.0.96. If k12/Rr is too small, the outermost layer of magnetic conduction channel is too narrow, the loss of the motor is increased, and the efficiency is reduced; if k12/Rr is too large, the distance between the first filling groove 51 and the outer circumference of the rotor becomes too small, and the difficulty of machining increases. The ratio of the distance of the side edge close to the shaft hole side of the two innermost magnetic barrier layers close to the shaft hole side on the q axis to the width of the rotating shaft on the q axis is greater than 1.2, so that on one hand, the width of a magnetic conduction channel between the innermost magnetic barrier layers and the rotating shaft can be ensured, the magnetic flux density saturation of the rotor is reduced, and on the other hand, the mechanical strength of the rotor close to the rotating shaft can be enhanced. The ratio of the diameter of an arc line section of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q shaft is larger than 2, so that the magnetic barrier layers are arranged by reasonably utilizing the rotor space.

In some embodiments, the maximum thickness of the first filling groove 51 in the q-axis direction is k, the maximum thickness of the second filling groove 52 in the magnetic barrier layer adjacent to the first filling groove in the q-axis direction is k1, and the minimum thickness of the magnetic conduction channel adjacent to the second filling groove in the q-axis direction is k2, so that 1 < k/k1 ≦ 2, and 0.8 < k/k2 ≦ 1.6. The thickness of the first filling groove 51 along the q-axis direction is ensured to reduce the processing difficulty, and the width of the outermost magnetic conduction channel is also ensured to improve the motor performance.

In some embodiments, the interval between the filling groove of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is h3, the interval between the outermost magnetic barrier layer close to the outer circle side of the rotor and the outer circle of the rotor is h4, then h4 is more than or equal to h3, 0 is more than or equal to h3 and less than or equal to 2.5 sigma, and sigma is the width of an air gap between the inner diameter of the stator and the outer diameter of the rotor. H3 is more than or equal to 0 and less than or equal to 2.5 sigma, namely the filling groove is an open groove or a closed groove, when the filling groove is the closed groove, the maximum interval between the filling groove and the outer circle of the rotor is limited, and the magnetic leakage can be reduced; h4 is more than or equal to h3, so that the magnetic leakage of the inner magnetic barrier layer can be reduced, and the mechanical strength of the outer magnetic barrier layer is ensured.

In some embodiments, the maximum width of the end part of the filling groove close to the outer circle side of the rotor along the q-axis direction is not more than the maximum width of the area of the filling groove close to the q-axis of the rotor along the q-axis direction, more preferably, the widths of the filling groove from the outer circle side of the rotor to the q-axis of the rotor are approximately equal, the width deviation is not more than 5%, the magnetic channel width between the rotor magnetic barrier layers close to the air gap is ensured, and the rotor saturation is reduced. Providing the filled slots with approximately equal widths along the q-axis direction can increase the area of the filled slots while ensuring the width of the magnetic tunnel near the air gap, which can help improve starting.

In some embodiments, the rotor of the motor comprises at least more than 5 filling grooves with different areas; the total area of the first filling groove 51 and the second filling groove 52 of the filling groove should account for 30% to 70% of the total area of the first filling groove 51, the second filling groove 52 and the slit groove 6 of the rotor groove, and more preferably, the ratio is 35% to 50%. The area of the filling groove with a certain proportion is ensured, so that the motor has certain on-load starting capability.

In some embodiments, the ratio τ of the maximum value and the minimum value of the thicknesses of all the filled grooves in the q-axis direction satisfies 1 ≦ τ ≦ 2; more preferably 1.3. ltoreq. tau. ltoreq.1.5. The ratio is limited, on one hand, the efficiency cannot be influenced because the width of the magnetic conduction channel is too small due to the fact that the thickness of the filling groove is too large in the q-axis direction, and on the other hand, the starting cannot be influenced because the area of the filling groove is too small due to the fact that the thickness of the filling groove is too small in the q-axis direction.

In some embodiments, the width of each second filling groove 52 in the direction of the d-axis is generally gradually increased toward the direction of the d-axis; more preferably, the maximum width of each second filling groove 52 along the d-axis direction increases continuously by at least 3 layers toward the d-axis direction; optimally, the maximum width of each second filling groove 52 in the direction of the d axis decreases continuously from the second layer of the magnetic barrier layer close to the d axis to the magnetic barrier layer close to the outer circle side of the rotor in the direction away from the d axis. By the arrangement, the amount of cast aluminum with a proper area can be ensured under the condition of reasonably utilizing the space of the rotor, and the starting capability of the motor is improved.

In some embodiments, the filled slots, including at least a part of the first filled slot 51 and the second filled slot 52, are filled with an electrically and magnetically conductive material, the filled slots are self-short-circuited by the end rings 3 at both ends of the second rotor sheet 2 to form a squirrel cage structure, and the material of the end rings 3 is the same as that of the filled slots. The squirrel-cage structure with self-short circuit provides asynchronous torque at the starting stage of the motor so as to realize the self-starting of the motor; the multi-layer magnetic barrier layer structure provides reluctance torque for the motor so as to realize synchronous operation of the motor.

In some embodiments, the slit groove 6 is composed of arc line segments and/or straight line segments, the arc degree of the arc line segment of the slit groove 6 is gradually increased from the rotor shaft hole side to the rotor outer circle side, and the arc degree of the outer circle of the slit groove 6 on the same layer is larger than that of the inner circle, and the arc line segment protrudes toward the side far away from the shaft hole side; or the two ends of the slit groove 6 extend along the d-axis direction to form straight line segments, the two ends of part or all of the slit groove 6 are parallel to the d-axis, and the width of the slit groove 6 is gradually increased from the middle position (q-axis) of the slit groove 6 to the two ends (d-axis). Open in the middle of the rotor has shaft hole 7, and such setting mode can increase the utilization ratio in rotor space, and rational arrangement slot 6 to increase rotor salient pole ratio, promote motor reluctance torque.

In some embodiments, the curve length between the ends of each layer of the slit grooves 6 near the two second filling grooves 52 gradually decreases from the rotor shaft hole side to the rotor outer circumferential side, and the curve length of the adjacent slit grooves 6 decreases by a ratio of 5% to 25%. The shaft hole 7 is arranged in the middle of the rotor, so that the purpose of setting is to ensure the proportion of the magnetic barrier layer under the condition of reasonably utilizing the space of the rotor, and the performance of the motor is improved.

In some embodiments, the maximum width of the shaft hole 7 in the q-axis direction is not greater than the maximum width of the shaft hole 7 in the d-axis direction. The slot groove 6 is arranged in the q-axis direction, and the utilization rate of the rotor space can be increased by the arrangement mode, so that the slot groove 6 is reasonably arranged, the rotor salient pole ratio is increased, and the motor reluctance torque is improved.

In some embodiments, the shaft hole 7 is composed of arc line segments and/or straight line segments, i.e. the shape of the shaft hole 7 is not limited to be circular or elliptical or ellipse-like or quadrilateral, and the shape of the shaft hole 7 can be flexibly selected according to the arrangement of the slit groove 6.

The balance blocks are arranged on the end rings 3 at two ends of the rotor and are placed on one side, with large radial width, between the inner hole and the outer circle of the end ring 3.

The utility model provides a self-starting synchronous reluctance motor rotor, which realizes the self-starting of a motor through asynchronous torque provided by a rotor conducting bar (namely a component formed after a filling groove is filled), solves the problem that the synchronous reluctance motor needs to be driven by a frequency converter, reduces the loss of the motor and improves the efficiency of the motor; the motor rotor can reduce the harmonic wave of a motor, reduce torque pulsation, reduce harmonic loss and improve the efficiency and the operation stability of the motor; the area of the rotor in direct contact with air can be increased, circulation holes are formed, and the heat dissipation of the rotor is increased.

It will be understood that the length, width, thickness, diameter, etc. of the relevant structure of the rotor core in the present invention may preferably be measured in mm, and other suitable measurement units may be selected and used as appropriate.

According to the embodiment of the utility model, the self-starting synchronous reluctance motor, in particular to the self-starting synchronous reluctance two-pole motor, comprises the motor rotor, and the load inertia connected with the output end of the motor shaft is less than 60% of the inertia of the rotating shaft system of the motor.

According to an embodiment of the present invention, there is also provided a compressor including the self-starting synchronous reluctance motor described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (42)

1. A motor rotor is characterized by comprising a rotor core, wherein the rotor core comprises a first rotor punching sheet (4) and a second rotor punching sheet (2), a filling groove and a slit groove (6) are formed in the first rotor punching sheet (4), the filling groove comprises a second filling groove (52) and a first filling groove (51), a plurality of magnetic barrier layers spaced along a q axis of the first rotor punching sheet (4) are arranged on the first rotor punching sheet, the plurality of magnetic barrier layers comprise two outer magnetic barrier layers and a plurality of inner magnetic barrier layers positioned between the two outer magnetic barrier layers, the outer magnetic barrier layers comprise a first filling groove (51), the inner magnetic barrier layers comprise a slit groove (6) and second filling grooves (52) positioned at two ends of the slit groove (6), a partition rib (8) is arranged between the second filling groove (52) and the slit groove (6) in the same inner magnetic barrier layer, and the second rotor punching sheet (2) is arranged between an end ring (3) and the first rotor punching sheet (4), the second rotor punching sheet (2) is provided with a communicating groove (21) corresponding to the filling groove, the radial width between the inner hole of the second rotor punching sheet (2) and the excircle of the second rotor punching sheet is unequal at different positions, and the radial width of the rotor separation blade on the d axis is greater than that on the q axis.

2. The machine rotor as claimed in claim 1, characterized in that the radial width kd1 of the second rotor sheet (2) in the d-axis and the radial width kq1 thereof in the q-axis satisfy 1.1 ≦ kd1/kq1 ≦ 2.8.

3. The machine rotor as claimed in claim 2, characterized in that 1.2. ltoreq. kd1/kq 1. ltoreq.1.8.

4. The rotor of an electric machine according to claim 1, characterised in that the total area of the slot slots (6) on the first rotor sheet (4) on the inner circumferential side of the inner bore of the second rotor sheet (2) accounts for at least 20% of the total area of the flow opening of the electric machine.

5. The motor rotor as recited in claim 4, characterized in that the total area of the slot grooves (6) on the first rotor punching (4) at the inner peripheral side of the inner bore of the second rotor punching (2) accounts for 25-40% of the total area of the motor flow hole.

6. The electric machine rotor as recited in claim 1, characterized in that the maximum width of the outer contour of the second rotor sheet (2) is not greater than the outer diameter of the first rotor sheet (4); and/or the axial thickness of the second rotor punching sheet (2) is not less than that of the single first rotor punching sheet (4).

7. The motor rotor as recited in claim 1, characterized in that the maximum width of the inner hole of the second rotor punching sheet (2) on the q axis is not less than the maximum width on the d axis, and the ratio of the maximum width of the inner hole of the second rotor punching sheet (2) on the q axis to the maximum width on the d axis is 1-1.5; and or the total area of the communication grooves (21) on the second rotor punching sheet (2) is not more than the total area of the filling grooves arranged on the first rotor punching sheet (4).

8. The motor rotor as recited in claim 1, characterized in that the communicating groove (21) provided on the second rotor punching (2) has the same position as the filling groove provided on the first rotor punching (4), and the area of the single communicating groove (21) on the second rotor punching (2) is not larger than that of the single filling groove on the first rotor punching (4); and/or the width between the inner hole of the second rotor punching sheet (2) and the communication groove (21) along the d-axis direction is larger than the width of the dividing rib (8) between the communication groove (21) and the slit groove (6).

9. An electric machine rotor according to claim 1, characterized in that the total area of the slot slots (6) in the first rotor sheet (4) located inside the inner bore of the second rotor sheet (2) accounts for at least 30% of the total area of the rotor slot slots (6).

10. An electric machine rotor according to claim 9, characterised in that the total area of the slot slots (6) in the first rotor sheet (4) that are located within the inner bore of the second rotor sheet (2) is 45-65% of the total area of the rotor slot slots (6).

11. The motor rotor as recited in claim 1, characterized in that the area of the slit grooves (6) in each layer of magnetic barrier layer on the first rotor punching sheet (4) within the inner hole of the second rotor punching sheet (2) is gradually reduced from the rotor shaft hole side to the rotor outer circle side.

12. An electric machine rotor according to claim 1, characterized in that the maximum width of the outer contour of the end ring (3) is not larger than the maximum width of the outer contour of the second rotor sheet (2) and/or the maximum distance from the center of the rotor core to the end face of the end ring (3) is not smaller than the maximum distance from the center of the rotor core to the end face of the second rotor sheet (2).

13. An electric machine rotor according to claim 1, characterised in that the radial width between the inner bore and the outer circle of the end ring (3) is k9 on the d-axis and k10 on the q-axis, 1.1 ≦ k9/k10 ≦ 2.8.

14. The rotor of claim 13, wherein 1.2 ≦ k9/k10 ≦ 1.8.

15. The motor rotor according to claim 1, wherein a central point exists on the axial plane where the side edge of the dividing rib (8) close to the outer circle side of the rotor is located, the distance between two central points corresponding to two dividing ribs (8) in any two adjacent magnetic barrier layers along the d-axis direction is L, the maximum distance of a magnetic conduction channel formed between filling grooves in the two adjacent magnetic barrier layers along the q-axis direction is W, and L is more than or equal to 0 and less than 2W.

16. The motor rotor as recited in claim 1, characterized in that the axial plane where the side edge of the dividing rib (8) near the outer circle side of the rotor is located has a central point, the distance between two corresponding central points of two dividing ribs (8) in any two adjacent magnetic barrier layers along the d-axis direction is L, the width of the air gap formed between the inner diameter of the stator and the outer diameter of the rotor is σ, and L is more than or equal to 0 and less than 8 σ; or the width of the dividing rib (8) of the outermost magnetic barrier layer close to the outer circle side of the rotor along the d-axis direction is L1, the width of the dividing rib (8) of the innermost magnetic barrier layer close to the shaft hole side along the d-axis direction is L2, L1 is not less than L2, L1 is not less than 0.5 sigma, and sigma is the width of an air gap between the stator and the rotor.

17. The rotor of an electric machine according to claim 1, characterized in that in the first quadrant of the dq axes, the distance of the center of the division rib (8) with respect to the d-axis and the q-axis satisfies kq- ν kd + λ, kq being the distance of the center of the division rib (8) to the q-axis, kd being the distance of the center of the division rib (8) to the d-axis, ν 0.28 ≦ 0.46, λ 28 ≦ 33.

18. A rotor according to claim 1, characterised in that the width of the slot (6) in the q-axis decreases continuously in a direction away from the d-axis by at least 3 layers; and/or the ratio of the sum of the widths of all the slit grooves (6) and the first filling grooves (51) on the q axis (d1+ ∑ d2) to the width d3 of the shaft hole (7) to the outer circumference of the rotor is 0.2-0.5, wherein d1 is the width of the first filling groove (51) on the q axis, and d2 is the width of the slit groove (6) on the q axis.

19. An electric machine rotor, according to claim 1, characterized in that the minimum width W1, W1 ≧ d of the magnetic conduction channel between two adjacent filling slots, d being the minimum width of the magnetic conduction channel formed between the slit slot (6) corresponding to the two filling slots.

20. The motor rotor as claimed in claim 1, wherein the minimum distance h1 of the magnetic conduction channel between two adjacent magnetic barrier layers along the q-axis direction is such that h1 is more than or equal to 1.5h2, and h2 is the minimum width of the magnetic barrier layer with smaller width along the q-axis direction in the two adjacent magnetic barrier layers along the q-axis direction; or, a magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of each magnetic conduction channel on the q axis is gradually reduced towards the direction far away from the d axis.

21. An electric machine rotor according to claim 20, wherein the width of each magnetic conduction channel in the q axis is continuously reduced by at least three layers in a direction away from the d axis, and/or the magnetic conduction channel is formed between two adjacent magnetic barrier layers, and the width of the magnetic conduction channel formed by the arc line segments and the straight line segments is gradually increased from the q axis to two sides of the q axis.

22. The rotor of an electric machine according to claim 1, characterized in that in each layer of the magnetic barrier layers, the ratio of the width of the slit groove (6) in the q axis to the width of the slit groove (6) near the end of the filling groove is τ 1, τ 1 gradually increases from the innermost layer of the magnetic barrier layer to the outermost layer of the magnetic barrier layer; and/or in each layer of magnetic barrier layer, the ratio of the maximum width of the filling groove along the q-axis direction to the width of the slit groove (6) on the q-axis is tau 2, and the tau 2 is more than 1.4.

23. The motor rotor as recited in claim 1, wherein in the outer layer magnetic barrier layer near the outer circumferential side of the rotor, the width in the d-axis direction between the end portions near the slit groove (6) side of the two second filling grooves (52) located at both ends of the slit groove (6) is k 3; in the inner layer magnetic barrier layer adjacent to the inner layer magnetic barrier layer on the side close to the shaft hole, the width between the end parts of two second filling grooves (52) positioned at the two ends of the slit groove (6) on the side close to the slit groove (6) along the direction of the d axis is k4, and then 0.5-k 3/k 4-1 or 0.5-k 4/k 3-1.

24. The motor rotor as recited in claim 1, wherein in the outermost magnetic barrier layer on the rotor outer circumferential side, the width in the d-axis direction between the end portions on the slit groove (6) side of the two second filling grooves (52) located at both ends of the slit groove (6) is k 5; in the innermost magnetic barrier layer close to the rotor shaft hole side, the width along the d-axis direction between the end parts of two second filling grooves (52) at two ends of the slit groove (6) on the side close to the slit groove (6) is k6, and then 0.5-k 5/k 6-1 or 0.5-k 6/k 5-1.

25. The electric machine rotor as recited in claim 1, characterized in that the first filling groove (51) is located in the q-axis direction of the rotor periphery, has a segmented structure, and is composed of a plurality of q-axis filling grooves (511), and ribs (9) are present between every two adjacent q-axis filling grooves (511).

26. An electric machine rotor, according to claim 25, characterised in that the first filling grooves (51) have a number y of ribs (9), 1 ≦ y ≦ 4; and/or the width of the rib (9) between any two adjacent q-axis filling grooves (511) along the d-axis direction is L3, L3 is more than 0.1M1, L3 is more than 0.1M2, L3 is more than 0.05(M1+ M2), and M1 and M2 are respectively the maximum width of the any two adjacent q-axis filling grooves (511) along the d-axis direction.

27. A rotor for an electric machine according to claim 25, characterized in that the sum of the widths of the ribs (9) between any two adjacent q-axis filling grooves (511) in the d-axis direction is Σ L3, Σ L3 > 0.1 Σ (M1+ M2), Σ (M1+ M2) being the sum of the widths of the respective q-axis filling grooves (511) in the d-axis direction.

28. A rotor according to claim 25, characterised in that the width difference between the ribs (9) is within ± 20%; and/or the minimum value L3 of the width of each rib (9) should satisfy L3 ≧ sigma, and sigma is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

29. An electric machine rotor, according to claim 25, characterised in that the difference in area of each q-axis filling slot (511) is within ± 30%.

30. The motor rotor as recited in claim 1, characterized in that the angle between the two ends of the first filling groove (51) and the connecting line of the rotor center is α 1, and α 1 is more than or equal to 20 ° and less than or equal to 60 °; and/or the length extension direction of the filling groove deviates from the parallel angle of the d axis by no more than 5%.

31. The electric machine rotor according to claim 1, characterized in that the width of the first filling groove (51) in the d-axis direction is smaller than the width in the d-axis direction between the end portions of two second filling grooves (52) in the adjacent magnetic barrier layers adjacent thereto on the side close to the slit groove (6); and/or the ratio of the distance k12 from the first filling groove (51) to the rotor center in the q-axis direction to the rotor radius Rr satisfies 0.82 ≦ k12/Rr ≦ 0.96.

32. The electric machine rotor as claimed in claim 1, wherein the ratio of the distance in the q-axis direction of the side edges of the two innermost barrier layers close to the shaft hole side to the width in the q-axis direction of the rotating shaft is greater than 1.2; and/or the ratio of the diameter of an arc line segment of the side edge of the innermost magnetic barrier layer close to the shaft hole side and close to the shaft hole side to the width of the rotating shaft on the q axis is larger than 2.

33. The motor rotor as claimed in claim 1, wherein the maximum thickness of the first filling groove (51) along the q-axis direction is k, the maximum thickness of the second filling groove (52) in the magnetic barrier layer adjacent to the first filling groove along the q-axis direction is k1, and the minimum thickness of the magnetic conduction channel connected with the second filling groove along the q-axis direction is k2, so that 1 < k/k1 ≦ 2, 0.8 < k/k2 ≦ 1.6; or the interval between the filling groove of the innermost magnetic barrier layer close to the shaft hole side and the outer circle of the rotor is h3, the interval between the outermost magnetic barrier layer close to the outer circle side of the rotor and the outer circle of the rotor is h4, then h4 is not less than h3, h3 is not less than 0 and not more than 2.5 sigma, and sigma is the width of the air gap between the inner diameter of the stator and the outer diameter of the rotor.

34. The electric motor rotor as claimed in claim 1, wherein a maximum width in the q-axis direction of an end portion of the filling groove near the outer circumferential side of the rotor is not greater than a maximum width in the q-axis direction of a region of the filling groove near the q-axis of the rotor; and/or, the width deviation of the filling groove along the q-axis direction from the outer circle side of the rotor to the q-axis of the rotor is not more than 5%.

35. The motor rotor as recited in claim 1, characterized in that the first rotor sheet (4) has at least five filling grooves with different filling areas; and/or the total filling area of the first filling groove (51) and the second filling groove (52) accounts for 30-70% of the total area of the first filling groove (51), the second filling groove (52) and the slit groove (6).

36. The motor rotor as claimed in claim 1, wherein a ratio τ of a maximum value and a minimum value of the thicknesses of all the filling grooves in the q-axis direction satisfies 1 ≦ τ ≦ 2; alternatively, the width of each second filling groove (52) along the d-axis direction gradually increases toward the d-axis direction.

37. The electric machine rotor as recited in claim 36, characterized in that, towards the direction close to the d-axis, the maximum width of each second filling groove (52) along the d-axis direction increases continuously for at least three layers; and/or the maximum width of each second filling groove (52) along the direction of the d axis continuously decreases from the inner magnetic barrier layer of the second layer close to the d axis to the magnetic barrier layer close to the outer circle side of the rotor in the direction far away from the d axis.

38. The electric motor rotor as recited in claim 1, characterized in that at least some of the first (51) and second (52) filled slots are filled with an electrically and magnetically conductive material, the filled slots are self-short-circuited by end rings (3) at both ends of the second rotor sheet (2) to form a squirrel cage structure, and the material of the end rings (3) is the same as the material filled in the filled slots.

39. The motor rotor according to claim 1, characterized in that the slot (6) is composed of arc segments and/or straight segments, the arc of the arc segment of the slot (6) is gradually increased from the rotor shaft hole side to the rotor outer circle side, and the outer arc of the slot (6) on the same layer is larger than the inner arc, the arc segment protrudes toward the side far from the shaft hole; or the two ends of the slit groove (6) extend to form straight line segments along the direction of the d axis, the two ends of part or all of the slit groove (6) are parallel to the d axis, and the width of the slit groove (6) is gradually increased from the middle position of the slit groove (6) to the two ends.

40. The motor rotor as recited in claim 1, characterized in that the curve length between the ends of each layer of slit grooves (6) close to the two second filling grooves (52) is gradually decreased from the rotor shaft hole side to the rotor outer circle side, and the curve length decreasing proportion of the adjacent slit grooves (6) is 5% -25%; and/or the maximum width of the shaft hole (7) in the q-axis direction is not greater than the maximum width of the shaft hole (7) in the d-axis direction.

41. A self-starting synchronous reluctance machine comprising the machine rotor of any one of claims 1 to 40.

42. A compressor, comprising the self-starting synchronous reluctance motor of claim 41.

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