JP2016039664A - Rotating electric machine rotor and rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a rotary electric machine capable of accurately aligning a rotor yoke, an output transmission member, and a central axis of the rotary shaft, and a rotary electric machine. SOLUTION: A first flange portion 21 having a cylindrical first cylindrical portion 20 and continuously protruding from one end of the first cylindrical portion 20 in the radial direction and having a hole 23 in the center thereof. A rotor yoke 2 made of a magnetic material, a plurality of permanent magnets 3 held on the outer peripheral surface of the first cylindrical portion 20 of the rotor yoke 2 at intervals in the circumferential direction, and the inside of the first flange portion 21. In the rotor 100 of a rotary electric machine provided with an output transmission member 4 which is fixedly held via an insulator 5 and transmits a rotational force generated in the rotor yoke 2 to a rotary shaft 6, the output transmission member 4 is used. A second cylindrical portion 40 fitted to the outer peripheral surface of the rotating shaft 6 so as to be coaxial with the rotating shaft 6, and a second flange portion 41 protruding outward in the radial direction from one end of the second cylindrical portion 40. .. [Selection diagram] Fig. 1

Description

  The present invention relates to a rotor of a rotating electric machine and a rotating electric machine using a permanent magnet mainly used for an air conditioner, a home appliance, and the like.

  In general, an air conditioner that performs air conditioning such as cooling and heating as one of the electric devices includes a fan for blowing air and a rotating electrical machine (motor) for rotationally driving the fan. In recent years, brushless DC motors having superiority in maintenance and energy efficiency are often used as motors used in such devices.

  In this brushless DC motor, an inverter of a pulse width modulation type (hereinafter referred to as PWM method) is used. When the brushless DC motor is driven by a PWM inverter, the neutral point potential of the winding does not become zero, so that a potential difference (hereinafter referred to as shaft voltage) is generated between the outer ring and the inner ring of the bearing. The shaft voltage includes a high-frequency component due to switching of the inverter. When the shaft voltage reaches the dielectric breakdown voltage of the oil film inside the bearing, a minute current flows inside the bearing, and electrolytic corrosion occurs inside the bearing. It is known that when electrolytic corrosion progresses, wavy wear reduction occurs in the bearing inner ring, bearing outer ring or bearing ball, and the motor noise caused by the bearing gradually increases.

  Therefore, in Patent Document 1, for example, a magnet, a rotor yoke, an output transmission portion that is a flat plate located inside the rotor yoke, and the rotor yoke and the output transmission portion are connected by integral molding, and the magnet is connected to the rotor yoke. A rotor of an electric motor comprising an insulating resin portion fixed to the outside of the rotor, and the shape of the output transmission portion is a shape in which protrusions are provided at several locations on the outer periphery, and the end surface portion of the rotor yoke, the protrusions There has been proposed a rotor of an electric motor that has a concave shape at a portion facing the motor. With this configuration, the rotor yoke and the output shaft are insulated from each other, the current generated in the rotor yoke is not transmitted to the output shaft, and the electrolytic corrosion of the bearing that causes drive noise is less likely to occur.

JP 2000-78787 A (FIGS. 1 and 2)

  In the invention according to Patent Document 1, the axial thickness of the disk-shaped output transmission member is very thin with respect to the axial length of the rotor yoke, and the output transmission member is at one end side in the axial direction of the rotor yoke. Since it is biased to be fixed via resin, it is difficult to accurately align the rotor yoke, the output transmission member, and the center axis of the rotating shaft, and there is a problem that the rotor that rotates at high speed is likely to be shaken. .

  The present invention has been made to solve the above-described problems, and can easily align the rotor yoke, the output transmission member, and the central axis of the rotating shaft with high accuracy while suppressing electrolytic corrosion of bearings and the like. An object of the present invention is to provide a rotor of a rotating electrical machine and a rotating electrical machine that are capable of rotating at a high speed and that do not shake the rotor core.

A rotor of a rotating electrical machine according to the present invention includes a cylindrical first cylindrical portion, and a first flange having a hole in the center that protrudes in the radial direction of the first cylindrical portion continuously from one end of the first cylindrical portion. A rotor yoke made of a magnetic material having a portion;
A plurality of permanent magnets held on the outer circumferential surface of the first cylindrical portion of the rotor yoke at intervals in the circumferential direction;
In the rotor of the rotating electrical machine, including an output transmission member that is fixedly held inside the first flange portion via an insulator and transmits a rotational force generated in the rotor yoke to a rotation shaft.
The output transmission member includes a second cylindrical portion that fits on the outer peripheral surface of the rotating shaft so as to be coaxial with the rotating shaft, and a second flange portion that protrudes radially outward from one end of the second cylindrical portion. It is equipped with.
The rotating electrical machine according to the present invention includes the rotor of the rotating electrical machine described above and a stator that inserts the rotor on the inner peripheral side.

In the rotor of the rotating electrical machine according to the present invention, the output transmission member is fitted from the second cylindrical portion that fits to the outer peripheral surface of the rotating shaft so as to be coaxial with the rotating shaft, and from one end of the second cylindrical portion. Since it is equipped with a second flange part that projects radially outward, it can easily and accurately couple the output transmission member and the central axis of the rotating shaft while suppressing electric corrosion of bearings, etc. However, it is possible to provide a rotor of a rotating electrical machine in which no blur occurs in the rotor core.
Since the rotating electrical machine according to the present invention includes the rotor of the rotating electrical machine described above and a stator that inserts the rotor on the inner peripheral side, the rotating electrical machine does not cause blur in the rotor core even during high-speed rotation. Can be provided.

It is the front view and sectional drawing of the rotor which concern on Embodiment 1 of this invention. It is the perspective view and front view which show only the rotor yoke and output transmission member which concern on Embodiment 1 of this invention. It is the front view, side view, and perspective view of the output transmission member which concern on Embodiment 1 of this invention. It is sectional drawing of the rotary electric machine which concerns on Embodiment 1 of this invention. It is the front view and sectional drawing of the rotor which concern on Embodiment 2 of this invention. It is the perspective view and front view which show only the rotor yoke and output transmission member which concern on Embodiment 2 of this invention. It is the front view, side view, and perspective view of an output transmission member concerning Embodiment 2 of this invention. It is sectional drawing of the rotor which concerns on Embodiment 3 of this invention. It is the front view, side view, and perspective view of an output transmission member concerning Embodiment 4 of this invention. It is the front view and sectional drawing of the rotor which concern on Embodiment 5 of this invention. It is the perspective view and front view which show only the rotor yoke and output transmission member which concern on Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
In addition, in this specification, an axial direction means the axial direction of the rotating shaft of a rotor. The radial direction and the circumferential direction refer to the radial direction and the circumferential direction of the rotor yoke.

FIG. 1A is a front view of the rotor 100.
FIG.1 (b) is sectional drawing in the AA of the rotor 100 of Fig.1 (a).
1A and 1B, a rotor 100 includes a rotor yoke 2, a permanent magnet 3 held at equal intervals on the outer peripheral surface of a cylindrical portion 20 (first cylindrical portion) of the rotor yoke 2, and An output transmission member 4 fixed through an insulator 5 inside the rotor yoke 2 and a rotary shaft 6 press-fitted into the output transmission member 4 are provided.

FIG. 2A is a perspective view showing only the output transmission member 4 and the rotor yoke 2 of the rotor 100. The positional relationship and shape of the output transmission member 4 and the rotor yoke 2 are shown.
FIG.2 (b) is the front view which looked at Fig.2 (a) from right above.
The rotor yoke 2 is made of a magnetic material such as iron, and has a cylindrical portion 20 and an annular flange portion 21 (first flange portion) projecting radially inward continuously from one end of the cylindrical portion 20 on the outermost periphery. . A hole 23 is opened at the center of the flange portion 21. On the inner peripheral surface of the hole 23, recesses 23a and protrusions 23b are alternately provided at equal intervals, and the inner periphery of the hole 23 has an uneven gear shape as shown in FIG.

  The cylindrical portion 20 of the rotor yoke 2 has an axial length approximately the same as the axial length of the permanent magnet 3 in order to secure a flow path for magnetic flux generated from the permanent magnet 3. The rotor yoke 2 is manufactured by a highly productive method such as press working. Specifically, a cylindrical plate 20 is formed by drawing and pressing a magnetic plate material, and the hole at the center of the flange portion is formed by press punching. In this case, an R-shaped portion 24 is formed at the connection portion between the flange portion 21 and the cylindrical portion 20.

FIG. 3A is a front view of the output transmission member 4 as viewed from the upper side (axial direction) of FIG.
FIG. 3B is a side view of the output transmission member 4.
FIG. 3C is a perspective view of the output transmission member 4.
The output transmission member 4 includes a cylindrical portion 40 (second cylindrical portion) in which the inner peripheral surface 40 c is fitted to the outer peripheral surface of the rotating shaft 6, and a flange portion 41 (first portion) projecting radially outward from one end of the cylindrical portion 40. 2 flanges). The output transmission member 4 is formed by drawing from a single material, and the rotating shaft 6 is press-fitted into the cylindrical portion 40 of the output transmission member 4.

  The cylindrical portion 40 has a size necessary for ensuring the coaxial accuracy of the output transmission member 4 with respect to the rotation shaft 6. Further, by providing the cylindrical portion 40 and increasing the surface area of the fitting portion between the rotary shaft 6 and the output transmission member 4, the rotational force generated in the rotor yoke 2 can be sufficiently transmitted to the rotary shaft 6, and the output transmission member The holding force between 4 and the rotary shaft 6 can be further strengthened.

  As shown in FIG. 3A, the outer peripheral shape of the flange portion 41 viewed from the axial direction is substantially similar to the shape of the hole 23 of the flange portion 21 of the rotor yoke 2 viewed from the axial direction. The concave portions 41a and the convex portions 41b are alternately provided in the shape of a concave and convex gear. The concave portion 41a of the flange portion 41 of the output transmission member 4 and the convex portion 23b of the flange portion 21 of the rotor yoke 2, and the convex portion 41b of the flange portion 41 of the output transmission member 4 and the concave portion of the flange portion 21 of the rotor yoke 2 23a is in mesh with the insulator 5 without being in direct contact therewith.

  An insulator 5 (not shown in FIGS. 2A and 2B) is interposed between the rotor yoke 2 and the output transmission member 4 so that the output transmission member 4 and the rotor yoke 2 are electrically insulated. Become. Further, since the innermost peripheral portion 23d of the rotor yoke 2 has a configuration closer to the rotating shaft 6 than the outermost peripheral portion 41d of the output transmission member 4, the rotational torque generated near the permanent magnet 3 is The flange 21 of the rotor yoke 2, the insulator 5, the output transmission member 4, and the rotation shaft 6 are transmitted in this order. At this time, the insulator 5 receiving the rotational torque mainly receives a force in the circumferential direction (rotating direction), and in the regions 50a and 50b where the rotor yoke 2 and the output transmission member 4 overlap in the circumferential direction, Subject to compressive load. As described above, since the load mainly received by the insulator 5 is a tensile load or a compressive load, extreme stress concentration is prevented compared to the bending load, and the rotor 100 of the rotating electrical machine with high reliability is obtained.

  As shown in FIG. 1B, the rotating shaft 6 is supported by two bearings 7a and 7b, and each bearing 7a and 7b is an E-ring fitted in a groove 60 provided in the rotating shaft 6. 8 is stopped. Although not shown, in order to suppress the press-fitting load on the rotary shaft 6, it is desirable that the cylindrical portion 40 is notched or the press-fitted portion of the rotary shaft 6 is knurled.

  The insulator 5 is fixed in a state where the output transmission member 4 and the rotor yoke 2 are electrically insulated, and has a shape distributed on the outer peripheral side from the hole 23 in order to support the weight of the rotor yoke 2. It is integrally molded. The insulator 5 is preferably made of, for example, PBT (polybutylene terephthalate) resin and the like, and glass fiber or the like is blended to increase strength and suppress molding shrinkage. In the present embodiment, when viewed from the axial direction, the insulator covers the gap between a circle passing outside the outermost peripheral portion 23e of the flange portion 21 and a circle passing inside the innermost peripheral portion 41e of the flange portion 41. 5 is provided.

  As a specific method of manufacturing the rotor 100, the cylindrical portion 20 of the rotor yoke 2 and the cylindrical portion 40 of the output transmission member 4 are arranged so that the rotor yoke 2 and the output transmission member 4 have the relative positional relationship shown in FIG. The insulator 5 is integrally molded so as to cover these above-mentioned ranges while being fixed to the molding die. Thereby, the coaxial precision of the cylindrical part 20 and the cylindrical part 40 can be improved, and as a result, the coaxial precision of the rotor yoke 2 and the rotating shaft 6 can be improved.

  As another manufacturing method, the insulator 5 is integrated by holding the rotating shaft 6 and the cylindrical portion 20 of the rotor yoke 2 with a molding die while the output transmission member 4 and the rotating shaft 6 are press-fitted in advance. It can also be molded. Thereby, the coaxial precision of the rotating shaft 6 and the cylindrical part 20 can further be improved.

FIG. 4 is a cross-sectional view of the rotating electrical machine 1 according to the present embodiment.
As shown in the figure, the rotating electrical machine 1 is obtained by inserting the rotor 100 into a separately manufactured stator 9.

  According to the rotor 100 and the rotating electrical machine 1 of the rotating electrical machine according to the first embodiment, the cylindrical yoke portion 40 is fitted to the rotating shaft 6 so that the rotor yoke is restrained from electrolytic corrosion of a bearing or the like. 2. The center axis of the output transmission member 4 and the rotating shaft 6 can be easily and accurately aligned, and a rotating electrical machine and a rotating electrical machine in which the rotor core does not shake even during high-speed rotation can be provided. Further, stress concentration and molding shrinkage on the insulator 5 can be suppressed.

  The axial length of the insulator 5 is much shorter than the axial length of the rotor yoke 2. Therefore, the dimensional change due to the axial shrinkage of the insulator 5 can be minimized. A radial load generated due to the unbalance of the rotor 100 is transmitted from the cylindrical portion 40 of the output transmission member 4 to the rotating shaft 6. Therefore, by making the distance between the bearing 7a and the cylindrical portion 40 and the distance between the bearing 7b and the cylindrical portion 40 equal, the load applied to the bearings 7a and 7b can be made uniform. Thereby, bearing 7a, 7b can be reduced in size.

  Further, since the bearing 7b can be disposed in the space inside the cylindrical portion 20 of the rotor yoke 2, the shaft length of the rotating shaft 6 can be reduced, and the material cost and processing cost of the rotating shaft 6 can be suppressed. it can.

  In the present embodiment, the E-ring 8 is used in the configuration for holding the bearings 7a and 7b. However, instead of the E-ring 8, a step for holding may be provided on the rotary shaft 6.

Embodiment 2. FIG.
Hereinafter, the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 5A is a front view of the rotor 200.
FIG.5 (b) is sectional drawing in the BB line of the rotor 200 of FIG.5 (b).
FIG. 6A is a perspective view showing only the rotor yoke 2 and the output transmission member 204. The positional relationship and shape of the output transmission member 204 and the rotor yoke 2 are shown.
FIG.6 (b) is the front view which looked at Fig.6 (a) from right above.
FIG. 7A is a front view of the output transmission member 204 as viewed from the upper side (axial direction) of FIG.
FIG. 7B is a side view of the output transmission member 204.
FIG. 7C is a perspective view of the output transmission member 204.

  The configuration of the output transmission member 204 is different between the rotor 100 according to the first embodiment and the rotor 200 according to the present embodiment. The output transmission member 204 includes a cylindrical portion 240, a flange portion 241, and a protrusion 43 extending in the axial direction (the side opposite to the side where the cylindrical portion 240 is provided) from the outer peripheral portion of the flange portion 241. Is press-fitted into the cylindrical portion 240.

  Each protrusion 43 of the output transmission member 204 is housed in the recess 23 a of the flange portion 21 of the rotor yoke 2, and is fixed in an electrically insulated state via an insulator 205. Further, as shown in FIG. 6B, the flange portion 241 of the output transmission member 204 overlaps with the tip of the convex portion 23b of the flange portion 21 of the rotor yoke 2 when viewed from the axial direction. Insulated and fixed by.

  According to the rotor 200 and the rotating electrical machine of the rotating electrical machine according to the second embodiment, the cylindrical portion 240 that is a fitting portion between the rotating shaft 6 and the output transmission member 204 is disposed near the center in the axial direction of the rotor yoke 2. Therefore, the radial load is transmitted to the rotating shaft 6 near the center in the axial direction of the rotor yoke 2. A radial load can be evenly distributed to the bearings 7a and 7b. Thereby, the burden concerning bearing 7a, 7b reduces, and the space | interval between bearing 7a, 7b can be made small. Thereby, a more compact rotating electrical machine in which the axial length of the rotating shaft 6 is suppressed can be obtained.

  Further, even if an axial load due to its own weight or magnetic attraction force is applied to the rotor 200, the flange portion 241 of the output transmission member 204 and the flange portion 21 of the rotor yoke 2 are arranged so as to overlap each other when viewed from the axial direction. Therefore, a tensile load and a compressive load are applied to the insulator 5 in a portion where both are overlapped. Thereby, extreme stress concentration on the insulator 5 can be prevented, and a highly reliable rotor 200 can be obtained.

Embodiment 3 FIG.
Hereinafter, the third embodiment of the present invention will be described with reference to the drawings, focusing on differences from the first and second embodiments.
FIG. 8 is a cross-sectional view of the rotor 300.
As shown in FIG. 8, the cylindrical portion 340 employed in the present embodiment has a shape obtained by extending the cylindrical portion 40 of the first embodiment in the axial direction. The end surface 44 of the cylindrical portion 340 on the side where the flange portion 341 is not provided is abutted against the inner ring of the bearing 7b and used as a bearing stopper. Thereby, the number of E-rings 8 used in the first embodiment can be reduced, and the component cost can be reduced.

Embodiment 4 FIG.
Hereinafter, the fourth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the second embodiment.
FIG. 9A is a front view of the output transmission member 404.
FIG. 9B is a side view of the output transmission member 404.
FIG. 9C is a perspective view of the output transmission member 404.
In the second embodiment, the protrusion 43 of the output transmission member 204 protrudes in the axial direction from the outer peripheral portion of the flange portion 241 toward the side where the cylindrical portion 240 is not present. In the present embodiment, FIG. ), (C), the protrusion 443 protrudes in the axial direction from the outer peripheral portion of the flange portion 441 toward the side where the cylindrical portion 440 exists (in the same direction). Since other configurations and effects are the same as those of the second embodiment, the description thereof is omitted.

Embodiment 5 FIG.
Hereinafter, the fifth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the second to fourth embodiments.
FIG. 10A is a front view of the rotor 500.
FIG.10 (b) is sectional drawing in the CC line of the rotor 500 of Fig.10 (a).
FIG. 11A is a perspective view showing only the rotor yoke 2 and the output transmission member 404. The positional relationship and shape of the output transmission member 404 and the rotor yoke 2 are shown.
FIG.11 (b) is the front view which looked at Fig.11 (a) from right above.

  As shown in FIG. 10, the rotor 500 includes a rotor yoke 2, an output transmission member 404 (same as that of the fourth embodiment) disposed inside the rotor yoke 2, an output transmission member 404 and the rotor yoke. Two sets of rotor yoke units 11 made of an insulator 505 integrally molded between the two, a permanent magnet 503 held by the cylindrical portion 20 of the two rotor yoke units 11, and the rotor yoke unit 11. A rotation shaft 506 is press-fitted into the cylindrical portion 440 of each output transmission member 404.

  The respective rotor yoke units 11 are arranged adjacent to each other so that the open end surfaces 22 of the cylindrical portions 20 of the respective rotor yokes 2 are aligned. The axial length of the cylindrical portion 20 of the rotor yoke 2 is about half of the axial length of the permanent magnet 503. Since other configurations are the same as those in the second to fourth embodiments, the description thereof is omitted.

According to the rotor 500 and the rotating electrical machine of the rotating electrical machine according to the fifth embodiment, the two cylindrical portions 440 are arranged at an interval, and can be generated in the rotor due to the unbalance of the magnetic attractive force. A robust rotor 500 having high rigidity against moment load can be obtained.
In addition, a permanent magnet having an axial length longer than the limit drawing depth of the rotor yoke 2 can be used, and a high output motor can be obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 rotary electric machine, 100, 200, 300, 500 rotor, 2 rotor yoke,
20 cylindrical part, 21 flange part, 22 end face, 23 hole, 23a, 41a recessed part,
23b, 41b convex part, 23d innermost peripheral part, 23e outermost peripheral part, 24R shape part,
3,503 permanent magnet, 4,204,404 output transmission member,
40, 240, 340, 440 cylindrical portion, 40c inner peripheral surface,
41, 241, 441 flange portion, 41d outermost peripheral portion, 41e innermost peripheral portion,
43,443 protrusion, 44 end face, 5,205,505 insulator, 6,506 rotating shaft, 50a, 50b region, 7a, 7b bearing, 8 ring, 9 stator,
11 Rotor yoke unit, 60 grooves.

Claims (11)

A rotor yoke made of a magnetic material having a cylindrical first cylindrical portion and a first flange portion that is continuous from one end of the first cylindrical portion and projects in the radial direction of the first cylindrical portion and has a hole in the center. When,
A plurality of permanent magnets held on the outer circumferential surface of the first cylindrical portion of the rotor yoke at intervals in the circumferential direction;
In the rotor of the rotating electrical machine, including an output transmission member that is fixedly held inside the first flange portion via an insulator and transmits a rotational force generated in the rotor yoke to a rotation shaft.
The output transmission member includes a second cylindrical portion that fits on the outer peripheral surface of the rotating shaft so as to be coaxial with the rotating shaft, and a second flange portion that protrudes radially outward from one end of the second cylindrical portion. And a rotor of a rotating electrical machine. The rotation according to claim 1, wherein when the rotor is viewed from the axial direction, the innermost peripheral portion of the first flange portion is formed at a position closer to the rotation shaft than the outermost peripheral portion of the second flange portion. Electric rotor. The first flange portion has a plurality of concave portions and convex portions provided at equal intervals on the inner peripheral portion,
The second flange portion includes a plurality of protrusions that are bent at equal intervals in the axial direction from the outer peripheral portion and protrude.
The rotor of a rotating electrical machine according to claim 2, wherein each of the protrusions is fixed in each of the recesses via the insulator. The rotor of the rotating electrical machine according to claim 3, wherein the protrusion protrudes from the second flange portion toward a side opposite to the side where the second cylindrical portion is located. The rotor of the rotating electrical machine according to claim 3, wherein the protrusion protrudes from the second flange portion toward a side where the second cylindrical portion is located. The rotation of the rotating electrical machine according to any one of claims 3 to 5, wherein when the rotor is viewed from an axial direction, a tip of the convex portion is formed at a position overlapping the second flange portion. Child. 7. The rotor of a rotating electrical machine according to claim 1, comprising two sets of rotor yoke units in which the output transmission member is fixed to the rotor yoke via the insulator. The rotor of a rotating electrical machine according to claim 7, wherein the two sets of the rotor yoke units are disposed adjacent to each other so that the first flange portion is on the outer side in the axial direction of the rotation shaft. The end surface of the second cylindrical portion on the side where the second flange portion is not provided is formed so as to be in contact with a bearing that rotatably supports the rotary shaft. The rotor of the rotary electric machine as described in 2. The part or all of one bearing which supports the said rotating shaft rotatably is arrange | positioned in the axial direction inner side rather than the end surface of the side without the said 1st flange part of the said rotor yoke. The rotor of the rotary electric machine according to any one of 9. A rotating electrical machine comprising: the rotor of the rotating electrical machine according to any one of claims 1 to 10; and a stator that inserts the rotor on an inner peripheral side.

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