CN216146166U - Rotor punching sheet structure - Google Patents
Rotor punching sheet structure Download PDFInfo
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- CN216146166U CN216146166U CN202120424867.5U CN202120424867U CN216146166U CN 216146166 U CN216146166 U CN 216146166U CN 202120424867 U CN202120424867 U CN 202120424867U CN 216146166 U CN216146166 U CN 216146166U
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Abstract
本实用新型公开了一种转子冲片结构，包括冲片本体，所述冲片本体上设置有多个沿周向对称分布的磁极，每一磁极包括一个关于D轴中心线对称的第一磁钢槽、两个关于D轴中心线呈V形对称分布的第二磁钢槽、两个对称分布于第一磁钢槽两端外侧第一空气槽，和一个位于两个第二磁钢槽的近心端的中间的第二空气槽；所述第一空气槽与冲片本体外圆形成第一磁桥，第一磁钢槽与第一空气槽之间形成第二磁桥；所述第二磁钢槽的远心端与冲片本体外圆形成第三磁桥，第二磁钢槽的近心端与第二空气槽之间形成第四磁桥。本实用新型的转子冲片结构，通过创新的设计，具有高效、高性能、低噪声、高转速、低成本的显著优点。
The utility model discloses a rotor punching structure, comprising a punching body, a plurality of magnetic poles symmetrically distributed along the circumferential direction are arranged on the punching body, and each magnetic pole includes a first magnetic pole symmetrical about the center line of the D axis Steel grooves, two second magnetic steel grooves symmetrically distributed in a V shape with respect to the centerline of the D axis, two first air grooves symmetrically distributed on the outside of both ends of the first magnetic steel groove, and one located in the two second magnetic steel grooves The second air slot in the middle of the proximal end of the die; the first air slot and the outer circumference of the punch body form a first magnetic bridge, and a second magnetic bridge is formed between the first magnetic steel slot and the first air slot; the first magnetic bridge is formed between the first magnetic steel slot and the first air slot; A third magnetic bridge is formed between the distal end of the second magnetic steel slot and the outer circumference of the punching body, and a fourth magnetic bridge is formed between the proximal end of the second magnetic steel slot and the second air slot. The rotor punching structure of the utility model has the remarkable advantages of high efficiency, high performance, low noise, high rotational speed and low cost through innovative design.
Description
Technical Field
The utility model relates to the field of new energy automobile motors, in particular to a rotor punching sheet structure.
Background
The permanent magnet synchronous motor is used as the most main motor type of a driving motor of a new energy automobile, has the outstanding advantages of high efficiency and high performance, and along with the increasing requirements of the new energy automobile on the cost, silence and rotating speed of the driving motor, the electromagnetic scheme with high efficiency, high performance, low noise, high rotating speed and low cost is the difficult point designed by the latter electromagnetic scheme.
The rotor punching sheet is used as the most core part of the permanent magnet synchronous motor, and directly determines key indexes such as performance, cost, noise and the like of a motor scheme. The traditional permanent magnet motor rotor punching sheet cannot give consideration to all the key indexes.
The disclosed patent document 1 (publication number CN 111654133 a) discloses a motor rotor punching sheet and a motor rotor assembly system, wherein the motor rotor punching sheet comprises a rotor punching sheet body, and is provided with multiple groups of magnetic steel grooves, multiple groups of auxiliary grooves and multiple harmonic elimination holes, the multiple groups of magnetic steel grooves are distributed at intervals along the circumferential direction of the rotor punching sheet body, each group of magnetic steel grooves comprises a first magnetic steel groove and a second magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are sequentially distributed at intervals in the direction from the edge to the center of the rotor punching sheet body, the second magnetic steel groove comprises a first section and a second section, and a magnetic bridge is arranged between the first section and the second section; the auxiliary grooves are arranged corresponding to the magnetic steel grooves, and each auxiliary groove comprises two open grooves correspondingly positioned at two ends of a first magnetic steel groove; the plurality of detuning holes are correspondingly arranged between every two adjacent first magnetic steel grooves.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: based on the design of the rotor punching sheet, the rotor punching sheet structure with high efficiency, high performance, low noise, high rotating speed and low cost is provided.
The technical scheme of the utility model is as follows:
a rotor punching structure is characterized by comprising a punching body, wherein a plurality of magnetic poles which are symmetrically distributed along the circumferential direction are arranged on the punching body, and each magnetic pole comprises a first magnetic steel groove, two second magnetic steel grooves, two first air grooves and a second air groove;
the first magnetic steel groove is symmetrical about the central line of the D shaft, and first magnetic steel is arranged in the first magnetic steel groove; the two first air grooves are symmetrically distributed at the outer sides of the two ends of the first magnetic steel groove; the first air groove and the outer circle of the punching sheet body form a first magnetic bridge, and a second magnetic bridge is formed between the first magnetic steel groove and the first air groove;
the two second magnetic steel grooves are symmetrically distributed in a V shape around the central line of the D shaft, and a second magnetic steel is respectively arranged in the two second magnetic steel grooves; the second air groove is positioned in the middle of the proximal ends of the two second magnetic steel grooves; the far-center end of the second magnetic steel groove and the outer circle of the punching sheet body form a third magnetic bridge, and a fourth magnetic bridge is formed between the near-center end of the second magnetic steel groove and the second air groove.
Preferably, the first air groove is provided with four side edges, wherein the side edge adjacent to the outer circle of the punching sheet body is an arc line segment concentric with the outer circle of the punching sheet body, and the side edge and the outer circle of the punching sheet body form a first magnetic bridge with equal width; the adjacent side edges of the first air groove and the first magnetic steel groove are parallel to each other to form a second magnetic bridge with the same width.
Preferably, the included angle between the second magnetic bridge and the long edge of the first magnetic steel is 130-140 degrees.
Preferably, the included angle between the second magnetic bridge and the long side of the first magnetic steel is 132-137 degrees.
Preferably, the included angle between the second magnetic bridge and the long edge of the first magnetic steel is 135 degrees.
Preferably, the side edge of the second magnetic steel groove adjacent to the outer circle of the stamped sheet body is an arc line segment concentric with the outer circle of the stamped sheet body, and the side edge of the far-end and the outer circle of the stamped sheet body form a third magnetic bridge with the same width.
Preferably, the included angle between the connecting line from the outermost point of the second magnetic steel groove to the central point of the punching sheet and the central line of the D axis is 20-21 degrees.
Preferably, the included angle between the connecting line from the outermost point of the second magnetic steel groove to the central point of the punching sheet and the central line of the D axis is 20.5-21 degrees.
Preferably, the second air groove is of a trapezoidal structure and is symmetrical about a central line of the D axis, and an included angle between two side edges of the second air groove is 0-10 degrees; the adjacent side edges of the second magnetic steel groove and the second air groove are parallel to each other to form a fourth magnetic bridge with the same width.
Preferably, the included angle between the two side edges of the second air groove is 5 degrees.
Preferably, the width of the first magnetic bridge is the same as that of the second magnetic bridge, and the width of the fourth magnetic bridge is 1.4 to 1.6 times that of the third magnetic bridge.
Preferably, two rotor surface grooves are further formed in the outer circumference of the rotor sheet located on the outer side of the magnetic pole, and the two rotor surface grooves are symmetrically distributed on the central line of the D shaft.
Preferably, the included angle between the line from the midpoint of the groove on the surface of the rotor to the center point of the punching sheet body and the central line of the D axis is 12.5-13 degrees; the depth of the groove on the surface of the rotor is 0.4-0.6% of the radius of the punching sheet body, and the width of the groove is 2-4% of the radius of the punching sheet body.
Preferably, the line segment joints of the side edges of the first magnetic steel groove, the second magnetic steel groove, the first air groove, the second air groove and the rotor surface groove are all arranged in fillet guiding structures.
The utility model has the advantages that:
the rotor punching sheet structure has the remarkable advantages of high efficiency, high performance, low noise, high rotating speed and low cost through innovative design. Wherein:
(1) the second air slot is arranged between the two second magnetic steel slots close to the center, so that the D-axis inductance can be effectively reduced, but the Q-axis inductance is not influenced, the salient pole rate of the rotor is obviously higher than that of the traditional rotor, and the design target of high performance and low cost can be realized;
(2) the rotor surface groove is arranged, the rotor surface groove is provided with the fillet guiding structure, and the depth and the width of the groove are designed, so that harmonic electromagnetic force can be effectively reduced, and the adverse effect on the performance of a motor is avoided;
(3) according to the utility model, the included angle between the connecting line from the outermost point of the second magnetic steel groove to the central point of the punching sheet and the central line of the D axis is elaborately designed, so that the stress of the third magnetic bridge can be effectively reduced, the width of the third magnetic bridge can be reduced, the magnetic leakage of the magnetic steel can be reduced, and the utilization rate of the magnetic steel can be improved.
(4) According to the utility model, by designing the width ratio of the fourth magnetic bridge to the third magnetic bridge, and the included angle between two side edges of the fourth magnetic bridge, and combining the reasonable design of the included angle between the connecting line from the outermost point of the second magnetic steel groove to the central point of the punching sheet and the central line of the D axis, the stress of the third magnetic bridge and the stress of the fourth magnetic bridge can be equivalent; the situation that material waste is caused by overlarge stress of one magnetic bridge and undersize stress of the other magnetic bridge is avoided;
(5) according to the utility model, the included angle between the second magnetic bridge and the long edge of the first magnetic steel is designed, so that the stress at the second magnetic bridge can be reduced, and the width of the magnetic bridge can be reduced on the premise of keeping the performance unchanged, thereby reducing the magnetic leakage of the magnetic steel and improving the utilization rate of the magnetic steel.
Drawings
The utility model is further described with reference to the following figures and examples:
FIG. 1 is an overall schematic view of a rotor sheet structure;
FIG. 2 is a schematic view of one magnetic pole of a rotor lamination configuration;
FIG. 3 is a schematic view of a rotor groove design;
FIG. 4 is an exploded view of an embodiment stator-rotor air gap radial electromagnetic force FF 2;
FIG. 5 is an exploded view of stator-rotor air gap radial electromagnetic force FF2 of a comparative example;
FIG. 6 is a stress cloud of an embodiment;
FIG. 7 is a stress cloud plot of a third magnetic bridge of a comparative example;
FIG. 8 is a stress cloud of a second magnetic bridge of an embodiment;
fig. 9 is a stress cloud of the second magnetic bridge of the comparative example.
In the drawings: 1. a first magnetic steel; 2. a first magnetic steel slot; 3. a second magnetic steel; 4. a second magnetic steel slot; 5. a first air tank; 6. a second air tank; 7. a groove is formed on the surface of the rotor; 8. a first magnetic bridge; 9. a second magnetic bridge; 10. a third magnetic bridge; 11. a fourth magnetic bridge; 12. a D-axis central line; 13. the included angle between the second magnetic bridge and the long edge of the first magnetic steel; 14. and the included angle between the connecting line from the outermost point of the second magnetic steel groove to the central point of the punching sheet and the central line of the D axis.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 and 2, the utility model provides a rotor punching structure, which comprises a punching body, wherein a plurality of magnetic poles are symmetrically distributed along the circumferential direction on the punching body, and each magnetic pole comprises a first magnetic steel slot 2, two second magnetic steel slots 4, two first air slots 5 and a second air slot 6.
The first magnetic steel groove 2 is symmetrical about a D-axis central line 12, and a first magnetic steel 1 is arranged in the first magnetic steel groove 2; the two first air grooves 5 are symmetrically distributed at the outer sides of the two ends of the first magnetic steel groove 2; the first air groove 5 and the outer circle of the punching sheet body form a first magnetic bridge 8, and a second magnetic bridge 9 is formed between the first magnetic steel groove 2 and the first air groove 5.
The two second magnetic steel grooves 4 are symmetrically distributed in a V shape around the D-axis central line 12, and a second magnetic steel 3 is respectively arranged inside each of the two second magnetic steel grooves 4; the second air slot 6 is positioned in the middle of the proximal ends of the two second magnetic steel slots 4; the far-end of the second magnetic steel groove 4 and the excircle of the punching sheet body form a third magnetic bridge 10, and a fourth magnetic bridge 11 is formed between the near-center end of the second magnetic steel groove 4 and the second air groove 6.
The rotor punching sheet structure provided by the utility model has the remarkable advantages of high efficiency, high performance, low noise, high rotating speed and low cost through an innovative design.
The utility model also provides a rotor punching structure which comprises a punching body with the radius of 71.4mm, wherein 8 magnetic poles which are symmetrically distributed along the circumferential direction are arranged on the punching body; each magnetic pole comprises a first magnetic steel slot 2, two second magnetic steel slots 4, two first air slots 5 and a second air slot 6, and two rotor surface grooves 7 which are symmetrically distributed by using a D-axis central line 12 are further arranged on the circumference of a punching sheet on the outer side of each magnetic pole.
As shown in fig. 2, the first magnetic steel groove 2 is symmetrical about a D-axis central line 12, and a first magnetic steel 1 is installed in the first magnetic steel groove 2; the two first air grooves 5 are symmetrically distributed at the outer sides of the two ends of the first magnetic steel groove 2; the first air groove 5 and the outer circle of the punching sheet body form a first magnetic bridge 8, and a second magnetic bridge 9 is formed between the first magnetic steel groove 2 and the first air groove 5; the two second magnetic steel grooves 4 are symmetrically distributed in a V shape around the D-axis central line 12, and a second magnetic steel 3 is respectively arranged inside each of the two second magnetic steel grooves 4; the second air slot 6 is positioned in the middle of the proximal ends of the two second magnetic steel slots 4; the far-end of the second magnetic steel groove 4 and the excircle of the punching sheet body form a third magnetic bridge 10, and a fourth magnetic bridge 11 is formed between the near-center end of the second magnetic steel groove 4 and the second air groove 6.
In the rotor formed by the punching sheet structure, the side edge of the far end of the second magnetic steel groove 4 adjacent to the outer circle of the punching sheet body is an arc line section concentric with the outer circle of the punching sheet body, and the side edge of the far end and the outer circle of the punching sheet body form a third magnetic bridge 10 with the same width. The second air groove 6 is of a trapezoidal structure and is symmetrical about a D-axis central line 12; the adjacent side edges of the second magnetic steel slot 4 and the second air slot 6 are parallel to each other to form a fourth magnetic bridge 11 with the same width. The second air slot 6 can effectively reduce the D-axis inductance, but has no influence on the Q-axis inductance, so that the salient pole ratio of the rotor of the utility model is obviously higher than that of the traditional rotor, and the design target of high performance and low cost can be realized.
Fig. 3 is a schematic design diagram of a rotor surface groove 7 in this embodiment, an initial groove is a triangular groove as shown by a dotted line in the figure, an arc-shaped groove is formed by adding a rounded corner structure, the groove depth is 0.4% -0.6% of the radius of the stamped steel body, the width is 2% -4% of the radius of the stamped steel body, the preferred depth is 0.35mm, and the width is 2.1 mm.
In the rotor formed by the punching sheet structure, the included angle between the connecting line of the groove 7 on the surface of the rotor to the central point of the punching sheet and the central line of the D shaft is 12.5-13 degrees, preferably 12.6 degrees, and the groove can effectively reduce the radial (0, 48 f) electromagnetic force of the air gap of the stator and the rotor of the motor, thereby effectively improving the noise of the motor. Fig. 4 is an exploded view of FFT2 of the stator-rotor air gap radial electromagnetic force under peak torque of the present embodiment, fig. 5 is an exploded view of FFT2 of the stator-rotor air gap radial electromagnetic force of the motor under the same working condition of the case of removing the rotor surface groove, and the radial (0, 48 f) electromagnetic force of the present embodiment is only 65% of that of the comparative case.
In the rotor formed by the punching sheet structure, the included angle 14 between the connecting line from the outermost point of the second magnetic steel groove 4 to the punching sheet central point and the D-axis central line is 20-21 degrees, and preferably 20.5-215 degrees. This angle can effectively reduce the stress of third magnetic bridge 10 to can reduce the width of third magnetic bridge 10, reduce the magnetic leakage of magnet steel, promote the utilization ratio of magnet steel. Fig. 6 and 7 are the third magnetic bridge stress distribution under the same working condition for the present embodiment and the case with the angle of 19 °, respectively, the maximum stress of the present embodiment is 254Mpa, the comparative case is 380Mpa, and the comparative case is 126Mpa higher than the example.
In the rotor composed of the punching sheet structure, the width of the fourth magnetic bridge 11 is 1.4-1.6 times, preferably 1.5 times, of the width of the third magnetic bridge 10, the included angle of two side edges of the second air groove is 0-10 degrees, preferably 5 degrees, and then the stress of the third magnetic bridge 10 and the stress of the fourth magnetic bridge 11 are equivalent by combining the reasonable design of the included angle between the connecting line from the outermost point of the second magnetic steel groove 4 to the central point of the punching sheet and the central line of the D axis; fig. 6 shows the stress distribution of the rotor sheet at a certain rotation speed in the embodiment, the maximum stress of the third magnetic bridge is 254Mpa, and the maximum stress of the fourth magnetic bridge is 252Mpa, which are basically equivalent to each other, so that the situation that one of the magnetic bridges has too large stress and the other magnetic bridge has too small stress, which causes material waste, is avoided.
In the rotor formed by the punching sheet structure, the first air groove 5 is provided with four side edges, wherein the side edge adjacent to the excircle of the punching sheet body is an arc line segment concentric with the excircle of the punching sheet body, and the side edge and the excircle of the punching sheet body form a first magnetic bridge 8 with equal width; the adjacent side edges of the first air slot 5 and the first magnetic steel slot 2 are parallel to each other to form a second magnetic bridge 9 with the same width. The width of the first magnetic bridge 8 is the same as the width of the second magnetic bridge 9. The included angle 13 scope on the long limit of second magnetic bridge 9 and the long limit of first magnet steel 1 is 130 ~140, and preferred scope is 132 ~ 137, and further preferred included angle is 135, and this included angle is the obtuse angle, and the stress of second magnetic bridge department can be reduced to this angle, consequently can be under the prerequisite that the holding performance is unchangeable, reduces the width of magnetic bridge, consequently reduces the magnet steel magnetic leakage, promotes the magnet steel utilization ratio. Fig. 8 and 9 are stress distributions of the second magnetic bridge under the same working condition for the present embodiment and the case with the included angle of 122 °, respectively, where the maximum stress of the present embodiment is 250Mpa, the maximum stress of the comparative case is 305Mpa, and the maximum stress of the comparative case is 55Mpa higher than that of the example.
In the embodiment of the utility model, the line segment joints of the side edges of the first magnetic steel groove 2, the second magnetic steel groove 4, the first air groove 5, the second air groove 6 and the rotor surface groove 7 are respectively provided with a fillet guiding structure, the radius of the fillet guiding structure is at least 0.3mm, and the radius of the fillet guiding structure can be properly increased according to the size of each groove, for example, the radius R of the fillet in the middle of the rotor surface groove 7 is 1.5mm, and the radius R of the fillets on the two sides is 1 mm.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the utility model are covered in the protection scope of the utility model.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120424867.5U CN216146166U (en) | 2021-02-26 | 2021-02-26 | Rotor punching sheet structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120424867.5U CN216146166U (en) | 2021-02-26 | 2021-02-26 | Rotor punching sheet structure |
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| CN216146166U true CN216146166U (en) | 2022-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865368A (en) * | 2021-02-26 | 2021-05-28 | 合肥巨一动力系统有限公司 | Rotor punching sheet structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865368A (en) * | 2021-02-26 | 2021-05-28 | 合肥巨一动力系统有限公司 | Rotor punching sheet structure |
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