WO2016009770A1

WO2016009770A1 - Rotor

Info

Publication number: WO2016009770A1
Application number: PCT/JP2015/067283
Authority: WO
Inventors: 智則佐々木; 祐弥井沢; 清上辻
Original assignee: 株式会社豊田自動織機
Priority date: 2014-07-16
Filing date: 2015-06-16
Publication date: 2016-01-21
Also published as: JP2016025669A

Abstract

A bracket (4) is provided so as to cover an end surface (3a) of a rotor core (3) by allowing the side wall portion (13) thereof to be inserted into a recess portion (20). A shaft (12) is provided coaxially with a substrate (11) and the side wall portion (13) is provided along the peripheral edge of the substrate (11), so that the side wall portion (13) is coaxial with the shaft. Further, since the recess portion (20) is coaxial with the rotor core (3), if the bracket (4) is provided so as to cover the end surface (3a) of the rotor core (3) by allowing the side wall portion (13) to be inserted into the recess portion (20) formed along the outer circumferential surface of the rotor core (3), the shaft (12) and the rotor core (3) easily become coaxial with each other.

Description

Rotor

The present invention relates to a rotor, and more particularly to a rotor including a rotor core and a bracket.

Generally, an outer rotor of a double rotor motor includes, for example, a cylindrical outer rotor core in which a plurality of annular steel plates are laminated and a shaft for transmitting rotation of the outer rotor, as described in Patent Document 1. And having a bracket. In order to position the outer rotor core and the bracket coaxially, conventionally, a positioning pin is used, or a center hole or a magnet hole of the outer rotor core is used.

JP 2004-72945 A

However, the conventional positioning method has a problem that it cannot be accurately positioned.

The present invention has been made to solve such problems, and an object thereof is to provide a rotor in which a rotor core and a bracket are accurately positioned.

The rotor according to the present invention includes a cylindrical rotor core and a bracket having a shaft. The rotor core is formed with a recess recessed in the axial direction with respect to one end face, and the bracket is inserted into the recess. The bracket is attached to the rotor core so that the shaft and the rotor core are coaxial by inserting the insertion portion into the recess.

According to this invention, the bracket is attached to the rotor core so that the shaft and the rotor core are coaxial by inserting the insertion portion of the bracket into the concave portion that is recessed in the axial direction with respect to one end surface of the rotor core. And the bracket can be accurately positioned.

It is sectional drawing of the rotor which concerns on Embodiment 1 of this invention. 3 is a plan view of a rotor core of the rotor according to Embodiment 1. FIG. FIG. 6 is a plan view of a rotor core according to a modification of the rotor according to the first embodiment. FIG. 10 is a cross-sectional view of another modification of the rotor according to the first embodiment. FIG. 10 is a cross-sectional view of still another modification of the rotor according to the first embodiment. FIG. 10 is a plan view of a rotor core of still another modified example of the rotor according to the first embodiment. It is sectional drawing of the double rotor motor provided with the rotor which concerns on Embodiment 2. FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
As illustrated in FIG. 1, the rotor 1 includes a cylindrical rotor core 3 in which a plurality of annular steel plates 2 are stacked and a columnar center hole 5 is formed so as to penetrate in the axial direction. And a bracket 4 provided so as to cover one end face 3a. The bracket 4 includes a circular substrate 11 having the same diameter as the outer diameter of the rotor core 3, a cylindrical shaft 12 provided coaxially with the substrate 11 and perpendicular to the substrate 11, and the shaft 11 opposite to the shaft 12. A cylindrical side wall portion 13 is provided on the side along the periphery of the substrate 11 and has the same outer diameter as the substrate 11. That is, the side wall portion 13 has a cylindrical shape concentric with the shaft 12.

The rotor core 3 is provided with a recess 20 that is recessed in the axial direction with respect to the end surface 3a. As shown in FIG. 2, the recess 20 is formed along the outer peripheral surface of the rotor core 3. The thickness of the recess 20 in the radial direction of the rotor core 3 is the same as the thickness of the side wall 13 (see FIG. 1) of the bracket 4 (see FIG. 1). Inside the rotor core 3, a plurality of magnets 21 are provided inside the rotor core 3 in the radial direction of the rotor core 3 so as to extend in the axial direction of the rotor core 3. That is, the recess 20 has an annular shape concentric with the rotor core 3.

As shown in FIG. 1, the bracket 4 is provided so as to cover the end surface 3 a of the rotor core 3 so that the side wall portion 13 is inserted into the recess 20. Here, since the side wall part 13 is inserted in the recessed part 20, it comprises an insertion part. Since the substrate 11 is in contact with the end surface 3 a, the bracket 4 can be fixed with respect to the axial direction of the rotor core 3. Instead of this configuration, the bracket 4 can be fixed with respect to the axial direction of the rotor core 3 even if the end surface 13 a of the side wall 13 is in contact with the bottom 20 a of the recess 20. Both configurations, that is, a configuration in which the substrate 11 is in contact with the end surface 3 a and the end surface 13 a of the side wall portion 13 is in contact with the bottom portion 20 a of the recess 20.

Here, from the fact that the shaft 12 is provided coaxially with the substrate 11 and that the side wall portion 13 is provided along the periphery of the substrate 11, the side wall portion 13 is coaxial with the shaft, and Since the recess 20 is coaxial with the rotor core 3, if the bracket 4 is provided so as to cover the end surface 3a of the rotor core 3 by inserting the side wall portion 13 into the recess 20 formed along the outer peripheral surface of the rotor core 3, The shaft 12 and the rotor core 3 are easily coaxial.

Thus, by inserting the side wall 13 of the bracket 4 into the recess 20 that is recessed in the axial direction with respect to the end surface 3a of the rotor core 3, the bracket 4 is attached to the rotor core 3 so that the shaft 12 and the rotor core 3 are coaxial. Since it is attached, the rotor core 3 and the bracket 4 can be accurately positioned.

In the first embodiment, the recess 20 is continuously formed along the outer peripheral surface of the rotor core 3, but is not limited to this embodiment. For example, as shown in FIG. 3, a recess 22 that is partially recessed with respect to the end surface 3 a along the outer peripheral surface of the rotor core 3 may be used. In this case, the insertion portion provided in the bracket 4 can be inserted into the recess 22 along the peripheral edge of the substrate 11 of the bracket 4 instead of the complete cylindrical side wall portion 13 as in the first embodiment. Only the shaped member needs to be provided. From the viewpoint of positioning the rotor core 3 and the bracket 4, the number of the recesses 22 may be one, but in order to firmly fix the bracket 4 to the rotor core 3, it is preferable to form two or more recesses 22. For example, by providing the two concave portions 22 at positions symmetrical with respect to the center of the rotor core 3, the dynamic balance of the bracket 4 can be improved.

In Embodiment 1, the recess 20 is formed by cutting the end surface 3a of the rotor core 3 in the axial direction, but the present invention is not limited to this embodiment. As shown in FIG. 4, a cylindrical protrusion 30 may be fixed along the center hole 5 perpendicular to the end surface 3a, and the recess 23 may be formed by the protrusion 30 and the end surface 3a. In this case, by attaching the protrusion 30 to the end face 3 a of the rotor core 3, the end face 30 a of the protrusion 30 becomes the end face of the rotor core 3, and the original end face 3 a becomes the bottom of the recess 23.

In the first embodiment, the recess 20 is formed along the outer peripheral surface of the rotor core 3, but is not limited to this embodiment. As shown in FIG. 5, the recess 24 may be formed by cutting out the inner peripheral surface 3 b of the rotor core 3 along the center hole 5. Further, the recess formed by cutting out the inner peripheral surface 3 b of the rotor core 3 along the center hole 5 does not have to be a perfect annular shape, and is partially curved in an arc shape along the center hole 5. It may be a concave portion.

Furthermore, the concave portion is not limited to being formed along the outer peripheral surface and the inner peripheral surface 3b of the rotor core 3. As shown in FIG. 6, in the region where the magnet 21 does not exist between the outer peripheral surface and the inner peripheral surface 3 b of the rotor core 3, the recess 25 is recessed with respect to the end surface 3 a and concentric with the center hole 5. Also good. The recess 25 may not be a perfect annular shape, and may be a recess partially curved concentrically with the center hole 5. Further, the curved concave portion is not limited to a shape curved in an annular shape, and no matter how curved, if the concave portion becomes coaxial with the rotor core 3 by inserting the insertion portion into the concave portion. Good.

In the first embodiment, the

recesses

20 and 22 to 25 are provided in order to position the rotor core 3 and the bracket 4 with high precision. However, the existing recesses, for example, a recess for reducing torque ripple and a skew are provided. You may utilize the recessed part for an effect.

Embodiment 2. FIG.
Next, the configuration of a rotor according to Embodiment 2 of the present invention will be described. In the second embodiment, the same reference numerals as those in FIGS. 1 to 6 are the same or similar components, and detailed description thereof is omitted.
The rotor according to the second embodiment of the present invention is an outer rotor of a double rotor motor with respect to the first embodiment.

FIG. 7 shows a cross-sectional view of a double rotor motor 40 provided with the rotor according to the second embodiment of the present invention as the outer rotor 41. The double rotor motor 40 is provided so as to be rotatable between a cylindrical stator 43, an inner rotor 42 that is a second rotor rotatably provided inside the stator 43, and the inner rotor 42 and the stator 43. The outer rotor 41 is provided.

A magnet (not shown) is provided on the outer rotor core 44 of the outer rotor 41, and coils (not shown) are wound around the inner rotor core 45 of the inner rotor 42 and the stator core 46 of the stator 43, respectively. Usually, the stator core 46 having a larger outer diameter has a larger amount of coil to be wound. Therefore, the height from the end face 46a of the coil end 48 protruding from the end face 46a of the stator core 46 protrudes from the end face 45a of the inner rotor core 45. It becomes higher than the height from the end surface 45 a of the coil end 47. Therefore, when the positions of the coil ends 47 and 48 are made flush with each other at the end of the double rotor motor 40, the axial length h _{2 of the} inner rotor core 45 is equal to the axial length h of the stator core 46. longer than _{_{_{1 (h 1 <h 2)}}} . That is, in the double rotor motor 40, the end surface 45a protrudes in the axial direction, and the end surface 46a is recessed in the axial direction. On the other hand, the axial length of the outer rotor core 44 and the inner rotor core 45 are each h _2, each of the end faces 44a and 45a are flush with.

Since the number of magnetic fluxes in the direction parallel to the axial direction between the magnet in the outer rotor core 44 and the coil wound around the stator core 46 is smaller than the number of magnetic fluxes in the direction perpendicular to the axial direction, the end face of the stator core 46 The number of magnetic fluxes that wraps around the coil wound around the stator core 46 from the magnet located at the portion Δh of the outer rotor core 44 that protrudes in the axial direction from 46a is small. That is, the portion Δh contributes little to the motor performance when viewed from the stator 43 side. On the other hand, the end face 45a of the inner rotor core 45 and the end face 44a of the outer rotor core 44 are flush with each other, and thus contribute to the motor performance over the entire length. Therefore, from the viewpoint of the motor performance, the recess 50 is preferably formed along the outer peripheral surface of the outer rotor core 44, and the bottom 50 a of the recess 50 is formed so as to be flush with the end surface 46 a of the stator core 46.

Thus, also for the outer rotor 41 of the double rotor motor 40, by inserting the side wall portion 13 (see FIG. 1) of the bracket 4 (see FIG. 1) into the recess 50, the same principle as in the first embodiment, The outer rotor core 44 and the bracket can be accurately positioned.

In the second embodiment, the outer rotor core 44 is longer in the axial direction than the stator core 46. However, when the stator core 46 is longer in the axial direction than the outer rotor core 44, the outer rotor core 44 is longer. What is necessary is just to form along the inner peripheral surface.
All the modifications in the first embodiment can also be applied to the second embodiment.

Claims

A cylindrical rotor core;
A bracket having a shaft,
The rotor core is formed with a recess recessed in the axial direction with respect to one end face,
The bracket is provided with an insertion portion to be inserted into the recess,
A rotor in which the bracket is attached to the rotor core so that the shaft and the rotor core are coaxial with each other by inserting the insertion portion into the recess.
The rotor according to claim 1, wherein the concave portion is curved so as to be coaxial with the rotor core, and the insertion portion is curved so as to be coaxial with the shaft.
3. The rotor according to claim 1, wherein the rotor is provided between a stator and a second rotor that is rotatably provided inside the stator.
The end surface of the stator core of the stator and the end surface of the second rotor core of the second rotor are not flush with each other,
The end surface of the rotor core of the rotor is flush with the end surface of the stator core of the stator or the end surface of the second rotor core of the second rotor that protrudes in the axial direction.
4. The rotor according to claim 3, wherein a bottom portion of the recess is flush with an end surface of the stator core of the stator or the end surface of the second rotor core of the second rotor that is recessed in the axial direction.