JP5484793B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a structure of a rotating electrical machine that fixes a stator in a cylindrical case.

  As this type of rotating electrical machine, Patent Document 1 discloses a brushed motor 1 shown in FIG.

  The motor 1 includes a bottomed cylindrical case 2, a cylindrical stator 3 fixed to the inner periphery of the case 2, a bracket 6 attached to the opening of the case 2, and the case 2. And a rotor 9 rotatably supported by a ball bearing 7 fixed to the bottom and a ball bearing 8 fixed to the inner periphery of the bracket 6.

  The stator 3 includes a cylindrical stator core 4 having a plurality of magnetic pole portions 4 a and permanent magnets 5 embedded in the magnetic pole portions 4 a of the stator core 4.

  In the motor 1, electricity supplied from a power source (not shown) through the lead wire 14, the brush 11, and the commutator 10 flows in the winding of the rotor 9, so that the magnetic force of the permanent magnet 5 acts on the rotor 9 in the rotation direction. The rotor 9 is rotationally driven.

  The stator core 4 is formed by laminating a plurality of steel plates. Each magnetic pole portion 4a of the stator core 4 is provided with a hole 4d into which the permanent magnet 5 is inserted, and the permanent magnet 5 is fixed in the hole 4d by adhesion or the like.

JP 2009-5541 A

  However, in the motor 1 shown in FIG. 2 disclosed in Patent Document 1, the permanent magnet 5 is disposed through the stator core 4. However, since the axial positioning is not performed, the stator core 4 and the permanent magnet are arranged. There was a possibility that torque ripple and cogging torque would increase due to a slight shift in the axial direction at the mounting position 5.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine that can suppress an increase in torque ripple and cogging torque.

A rotating electrical machine according to an aspect of the present invention includes a bottomed cylindrical case, a rotating shaft, a rotor rotating around the rotating shaft, a permanent magnet and a permanent magnet penetrating in the rotating shaft direction of the rotor. and a cylindrical stator core accommodating a stator interposed into the case, is interposed between the bottom and the stator of the case, the annular abutting the one end face and the end face of the permanent magnet of the stator core A positioning ring, and an adhesive that is applied to the other end surface of the stator core and the other end surface of the permanent magnet on the opening side of the case, and covers the other end surface of the stator core and the other end surface of the permanent magnet to bond the stator core and the permanent magnet. It is characterized by providing . In addition, a rotating electrical machine according to another aspect of the present invention includes a bottomed cylindrical case, a rotor that has a rotating shaft, and that rotates around the rotating shaft, and a through hole that penetrates the permanent magnet and the rotor in the rotating shaft direction. A cylindrical stator core that has a hole and accommodates a permanent magnet in the through-hole, and is interposed between the case, a bottom portion of the case and the stator, and one end surface of the stator core It is applied to the annular positioning ring that contacts one end surface of the permanent magnet and the other end surface of the stator core on the case opening side and the other end surface of the permanent magnet, and spreads between the through hole of the stator core and the surface of the permanent magnet. And an adhesive for adhering the stator core and the permanent magnet.

  According to the present invention, the stator core and the permanent magnet of the stator are positioned in the direction of the rotation axis of the rotor with respect to the bottom of the case by bringing the end faces into contact with the ring, and the positioning accuracy of both is enhanced. Thereby, the rotating electrical machine can suppress an increase in torque ripple and cogging torque.

Sectional drawing of the rotary electric machine which shows embodiment of this invention. Sectional drawing of the motor which shows a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of a brushed motor 1 provided as a rotating electrical machine.

  The motor 1 includes a bottomed cylindrical case 2, a cylindrical stator 3 fixed to the inner periphery of the case 2, a rotor 9 that rotates inside the stator 3, and a rectification provided in the rotor 9. A child (not shown) and a brush (not shown) slidably contacting the outer periphery of the commutator are provided.

  A bracket (not shown) is attached to the opening of the case 2. The rotor 9 is rotatably supported by a ball bearing 7 interposed in the bottom 2a of the case 2 and a ball bearing (not shown) interposed in the bracket.

  The stator 3 includes a stator core 4 and permanent magnets 5 embedded in the magnetic pole portions 4 a of the stator core 4.

  The stator core 4 has four magnetic pole portions 4a and a cylindrical yoke portion 4g connecting the magnetic pole portions 4a, and the motor 1 is configured as a four-pole motor. The number of magnetic poles of the motor 1 is not limited to this, and is increased or decreased according to the specification.

  In the motor 1, electricity supplied from a power source (not shown) via a lead wire, a brush, and a commutator flows in the winding of the rotor 9, so that the magnetic force generated in the rotor 9 rotates in the rotational direction with respect to the magnetic force of the permanent magnet 5. Thus, the rotor 9 is driven to rotate.

  The stator core 4 is formed by laminating a plurality of steel plates. The stator core 4 may be formed by, for example, sintering.

  The stator core 4 has its outer peripheral surface 4f fixed in the case 2 by press fitting.

  The permanent magnet 5 is provided so as to penetrate each magnetic pole portion 4 a of the stator core 4 in the direction of the rotation axis O of the rotor 9.

  Each magnetic pole portion 4a of the stator core 4 is provided with a hole 4d extending in the direction of the rotation axis O of the rotor 9 as a housing portion for housing the permanent magnet 5. The flat permanent magnet 5 is inserted into the hole 4d from the direction of the rotation axis O of the rotor 9 and interposed.

  In addition, you may provide the groove | channel extended in the rotating shaft O direction of the rotor 9 as an accommodating part in which the permanent magnet 5 is accommodated. In this case, the permanent magnet 5 is interposed in the groove and has a portion exposed from the inner peripheral surface or the outer peripheral surface of the stator core 4.

  As a means for positioning the stator 3 with respect to the case 2, a positioning ring 20 is interposed between the bottom 2 a of the case 2 and the end surface 3 a of the stator 3.

The positioning ring 20 is formed in an annular shape, and has an end surface 20 a that contacts the bottom 2 a of the case 2, an outer peripheral surface 20 b that contacts the inner peripheral surface 2 b of the case 2, and an end surface 20 c that contacts the end surface 3 a of the stator 3. .

  The positioning ring 20 is made of resin. The positioning ring 20 may be formed of a nonmagnetic material such as an aluminum material.

  An annular gap 21 is provided between the corner 2 d of the case 2 and the positioning ring 20. Thus, the positioning ring 20 is interposed at a predetermined position where the end surface 20 a abuts against the bottom 2 a of the case 2 without interfering with the corner 2 d of the case 2.

  The stator core 4 and the permanent magnet 5 of the stator 3 are positioned in the direction of the rotation axis O of the rotor 9 with respect to the bottom portion 2a of the case 2 by contacting the end faces 4c and 5a with the positioning ring 20, and the positioning of the two is performed. Increases accuracy.

  The stator core 4 and the permanent magnet 5 are bonded to the end face 3e on the opening side (commutator side) of the case 2 of the stator 3 by applying an adhesive 25.

  When the adhesive 25 having a high viscosity is used, the adhesive 25 is provided so as to cover the end face 4e of the stator core 4 and the end face 5e of the permanent magnet 5, and adheres the stator core 4 and the permanent magnet 5.

  Further, when a low viscosity adhesive is used, the adhesive 25 spreads between the hole 4 d of the stator core 4 and the surface of the permanent magnet 5 to bond the stator core 4 and the permanent magnet 5.

At the time of this bonding, the end face 20c of the positioning ring 20 abuts against the end face 3a of the stator 3 and closes the opening end of the hole 4d, so that the adhesive 25 extends over the positioning ring 20 toward the bottom 2a of the case 2. This prevents the problem that the adhesive 25 adheres to the ball bearing 7 or the like.

  In the present embodiment, a rotating electrical machine (motor 1) in which a rotor 9 rotates inside a stator 3 is a bottomed cylindrical case 2 and a cylindrical stator 3 interposed in the case 2. And an annular positioning ring 20 interposed between the bottom 2a of the case 2 and the stator 3, and the stator 3 penetrates the permanent magnet 5 and the permanent magnet 5 in the direction of the rotation axis O of the rotor 9. A cylindrical stator core 4 having an accommodating portion (hole 4d) for accommodating the permanent magnet 5 and the stator core 4 in the direction of the rotation axis of the rotor 9 when the end faces 4c and 5a abut against the positioning ring 20. It was set as the structure positioned about.

  Based on the above configuration, the stator core 4 and the permanent magnet 5 of the stator 3 are positioned in the direction of the rotation axis O of the rotor 9 with respect to the bottom 2a of the case 2 by the end surfaces 4c and 5a coming into contact with the ring 20. Therefore, both positioning accuracy can be improved. Thereby, the rotating electrical machine (motor 1) can suppress an increase in torque ripple and cogging torque.

  In the present embodiment, the stator core 4 and the permanent magnet 5 are bonded to each other by applying the adhesive 25 to the end surface 5e on the opening side (commutator side) of the case 2 of the stator 3.

  Based on the above configuration, the permanent magnet 5 is prevented from moving relative to the stator core 4 due to vibration or impact.

  The present invention is not limited to a motor, and can also be applied to a rotating electrical machine such as a generator that generates an electromotive force in a stator by the magnetic force of a rotating rotor.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Motor 2 Case 2a Bottom part 3 Stator 3a End surface 3e End surface 4 Stator core 4c End surface 4e End surface 4d Hole (accommodating part)
5 Permanent magnet 5a End face 5e End face 9 Rotor 20 Positioning ring 25 Adhesive

Claims (3)

A bottomed cylindrical case,
A rotor having a rotation axis and rotating about the rotation axis;
And a cylindrical stator core which accommodates the permanent magnet the permanent magnet is passed through the rotational axis of the rotor, and Luz stator is interposed in said casing,
An annular positioning ring interposed between the bottom of the case and the stator and abutting against one end face of the stator core and one end face of the permanent magnet ;
It is applied to the other end surface of the stator core and the other end surface of the permanent magnet, which are the opening side of the case, and covers the other end surface of the stator core and the other end surface of the permanent magnet to bond the stator core and the permanent magnet. rotating electric machine, wherein the adhesive, that Ru comprising a. A bottomed cylindrical case,
A rotor having a rotation axis and rotating about the rotation axis;
A stator having a permanent magnet and a cylindrical stator core having a through-hole penetrating in the rotational axis direction of the rotor and accommodating the permanent magnet in the through-hole, and interposed in the case;
An annular positioning ring interposed between the bottom of the case and the stator and abutting against one end face of the stator core and one end face of the permanent magnet;
It is applied to the other end surface of the stator core and the other end surface of the permanent magnet, which are the opening side of the case, and spreads between the through hole of the stator core and the surface of the permanent magnet to bond the stator core and the permanent magnet. it comprising: an adhesive, a rotary electric machine. The rotating electrical machine according to claim 1, wherein the positioning ring is provided with an annular recess for forming an annular gap between the positioning ring and a corner of the case.

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