JP2014073013A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that suppresses vibration of a yoke.SOLUTION: A rotary electric machine 10 includes: an armature 12; a yoke 36 that is formed into a cylindrical shape and that houses the armature 12; a spiral member 38 that is inserted on an inner side of the yoke 36 with an axial direction of the yoke 36 as an axial direction thereof, that is fixed to an inner circumferential surface 36A of the yoke 36, and that has elasticity in a radial direction and in the axial direction; and magnets 40 that are fixed to an inner circumferential portion 38C of the spiral member 38 and that face the armature 12 in the radial direction.

Description

  The present invention relates to a rotating electrical machine.

  2. Description of the Related Art Conventionally, there is known a rotating electric machine including an armature, a cylindrically formed yoke that accommodates the armature, and a magnet that is fixed to the inner peripheral surface of the yoke and faces the armature in the radial direction ( For example, see Patent Document 1).

JP 2001-352700 A Special table 2003-530808 gazette

  In such a rotating electrical machine, an electromagnetic force acts between the current flowing through the armature winding and the magnetic field of the magnet. This electromagnetic force varies with the rotation of the armature. In addition, due to the fluctuation of the electromagnetic force, an excitation force is applied to the magnet as vibration. This vibration is transmitted to the yoke and can cause, for example, motor noise.

  Then, an object of this invention is to provide the rotary electric machine which can suppress the vibration of a yoke.

  In order to achieve the above object, a rotating electrical machine according to claim 1 is provided with an armature, a yoke that is formed in a cylindrical shape and that houses the armature, and an inner side of the yoke with the axial direction of the yoke as an axial direction. And a helical member fixed to the inner peripheral surface of the yoke and having elasticity in the radial direction and the axial direction, and fixed to the inner peripheral portion of the helical member, and opposed to the armature in the radial direction. And a magnet to perform.

  According to this rotating electrical machine, a spiral member having elasticity in the radial direction and the axial direction is inserted inside the yoke with the axial direction of the yoke as the axial direction. And the magnet is being fixed to the yoke via this spiral member. Therefore, even when the excitation force resulting from the electromagnetic force is applied to the magnet, the excitation force can be attenuated by the spiral member. Thereby, the vibration of the yoke can be suppressed.

  The rotating electrical machine according to claim 2 is the rotating electrical machine according to claim 1, wherein the spiral member is filled with an adhesive so that at least part of the spiral gap is formed in the spiral member. The magnet is applied, and the magnet is fixed to the inner peripheral portion of the spiral member via the adhesive.

  According to this rotating electrical machine, at least a part of the adhesive applied to the spiral member for fixing the magnet is filled in the spiral gap formed in the spiral member. Therefore, when the excitation force resulting from the electromagnetic force is applied to the magnet, the vibration transmitted to the spiral member can be converted into the frictional heat of the adhesive. Thereby, the vibration of the yoke can be further suppressed.

  The rotating electrical machine according to claim 3 is the rotating electrical machine according to claim 1 or 2, wherein the axial end of the spiral member projects in the axial direction of the spiral member with respect to the magnet. It is said that.

  According to this rotating electrical machine, the axial end of the spiral member protrudes in the axial direction of the spiral member with respect to the magnet. Therefore, since the axial length of the spiral member is ensured with respect to the magnet, the exciting force applied to the magnet can be attenuated more effectively by the spiral member.

  The rotating electrical machine according to claim 4 is the rotating electrical machine according to any one of claims 1 to 3, wherein the helical member is closely fixed to the inner peripheral surface of the yoke. .

  According to this rotating electrical machine, the spiral member is tightly fixed to the inner peripheral surface of the yoke. Therefore, it is easy to assemble the spiral member to the yoke, and rattling of the spiral member with respect to the yoke can be suppressed.

  The rotating electrical machine according to claim 5 is the rotating electrical machine according to any one of claims 1 to 4, wherein the spiral member is formed of a ferromagnetic material.

  According to this rotating electrical machine, the spiral member is formed of a ferromagnetic material. Therefore, since this helical member constitutes a magnetic circuit together with the yoke, the yoke can be formed thin.

It is a longitudinal cross-sectional view of the rotary electric machine which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the stator shown by FIG. It is the figure which looked at the stator and armature shown by FIG. 1 from the axial direction. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure which shows the modification of the spiral member shown by FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  A rotating electrical machine 10 according to an embodiment of the present invention shown in FIG. 1 is a brushed DC motor, and includes an armature 12, a front housing 14, a brush device 16, and a stator 18.

  The armature 12 has a shaft 22, a commutator 24, a core 26, and a winding 28. A pair of bearings 30 and 32 are provided on the front housing 14 and a bottom portion 44 of a yoke 36 described later, respectively, and the shaft 22 is rotatably supported by the pair of bearings 30 and 32. The commutator 24 and the core 26 are fixed to the shaft 22, and the winding 28 is wound around the core 26. In addition, the terminal portion of the winding 28 is connected to the commutator 24.

  The front housing 14 is fixed to the end of the yoke 36 on the opening side, and the brush device 16 is fixed to the front housing 14. The brush device 16 includes a brush 34, and the brush 34 is in contact with the commutator 24.

  The stator 18 includes a yoke 36, a spiral member 38, and a magnet 40. The yoke 36 is made of a ferromagnetic material such as iron. The yoke 36 is formed in a bottomed cylindrical shape having an outer peripheral portion 42 and a bottom portion 44, and the armature 12 is accommodated inside the yoke 36.

  As shown in FIG. 2, the spiral member 38 is formed by a spiral spring member, and has elasticity in the radial direction and the axial direction. The cross-sectional shape of the wire constituting the spiral member 38 is circular. The spiral member 38 is formed of a ferromagnetic material such as iron, and is inserted inside the yoke 36 with the axial direction of the yoke 36 as the axial direction.

  In this embodiment, as an example, the spiral member 38 is tightly fixed to the inner peripheral surface 36 </ b> A of the yoke 36 by being press-fitted inside the yoke 36 while being rotated in the direction of reducing the diameter. The spiral member 38 has an axial length longer than that of a magnet 40 described later, and ends 38A and 38B (ends in the axial direction) on both sides in the axial direction of the spiral member 38 with respect to the magnet 40 in the axial direction. Protruding.

  As shown in FIG. 4, the plurality of winding portions 46 constituting the spiral member 38 are separated from each other. In the spiral member 38, a spiral gap 48 is formed along the boundary between the winding portions 46 adjacent to each other in the axial direction of the spiral member 38.

  The adhesive 50 is applied to the inner peripheral portion 38 </ b> C of the spiral member 38 over substantially the entire axial direction of the spiral member 38. A part of the adhesive 50 is filled in the gap 48, and another part of the adhesive 50 forms a layer on the inner peripheral portion 38 </ b> C of the spiral member 38. The magnet 40 is fixed to the inner peripheral portion 38 </ b> C of the spiral member 38 through the adhesive 50.

  Further, as shown in FIG. 3, the magnet 40 is formed in an arc shape along the inner peripheral surface 36 </ b> A of the yoke 36. In the present embodiment, as an example, the magnets 40 are respectively provided at positions facing the radial direction of the spiral member 38. Each magnet 40 faces the armature 12 in the radial direction.

  In the rotating electrical machine 10, when current is supplied to the brush 34, this current flows to the winding 28 via the commutator 24. Further, an electromagnetic force acts between the current flowing through the winding 28 and the magnetic field of the magnet 40, and the armature 12 is rotated.

  Next, the operation and effect of one embodiment of the present invention will be described.

  As described above in detail, according to the rotating electrical machine 10 according to an embodiment of the present invention, the spiral member 38 having elasticity in the radial direction and the axial direction is disposed inside the yoke 36 so that the axial direction of the yoke 36 is axial. Has been inserted as. The magnet 40 is fixed to the yoke 36 via the spiral member 38. Therefore, even when the excitation force resulting from the electromagnetic force is applied to the magnet 40, this excitation force can be attenuated (absorbed) by the spiral member 38.

  In other words, an excitation force along the radial direction of the yoke 36 is mainly generated in the magnet 40, but a part of this excitation force is converted by the spiral member 38 into the axial direction of the spiral member 38. The excitation force generated in the radial direction and the axial direction is attenuated by the spiral member 38 having elasticity in the radial direction and the axial direction. Thereby, the vibration of the yoke 36 can be suppressed.

  In addition, a part of the adhesive 50 applied to the spiral member 38 for fixing the magnet 40 is filled in a spiral gap 48 formed in the spiral member 38. Therefore, when the excitation force resulting from the electromagnetic force is applied to the magnet 40, the vibration transmitted to the spiral member 38 can be converted into the frictional heat of the adhesive 50. Thereby, the vibration of the yoke 36 can be further suppressed.

  Further, both end portions 38 </ b> A and 38 </ b> B in the axial direction of the spiral member 38 protrude in the axial direction of the spiral member 38 with respect to the magnet 40. Therefore, since the axial length of the spiral member 38 is ensured to be long with respect to the magnet 40, the excitation force applied to the magnet 40 can be attenuated more effectively by the spiral member 38.

  Further, the spiral member 38 is tightly fixed to the inner peripheral surface 36 </ b> A of the yoke 36. Therefore, the assembly of the spiral member 38 to the yoke 36 is easy, and rattling of the spiral member 38 with respect to the yoke 36 can be suppressed.

  Further, since the vibration of the yoke 36 can be suppressed by the above-described spiral member 38 and the adhesive 50, the yoke 36 can be thinned. Thereby, the weight reduction and cost reduction of the yoke 36 can be achieved.

  Further, the spiral member 38 is formed of a ferromagnetic material. Accordingly, since the spiral member 38 forms a magnetic circuit together with the yoke 36, the yoke 36 can be formed thin.

  Further, since the spiral member 38 can be manufactured at a high yield rate, the vibration of the yoke 36 can be suppressed while reducing the cost.

  Next, a modification of one embodiment of the present invention will be described.

  In the above embodiment, a part of the adhesive 50 is filled in the gap 48, and the other part of the adhesive 50 is layered on the surface of the inner peripheral portion 38C of the spiral member 38. A portion of the adhesive 50 that forms a layer on the inner peripheral portion 38C of the spiral member 38 may be omitted. That is, the magnet 40 may be fixed to the inner peripheral portion 38 </ b> C of the spiral member 38 with the adhesive 50 filled in the gap 48 while being in contact with the inner peripheral portion 38 </ b> C of the spiral member 38.

  Moreover, in the said embodiment, although the spiral member 38 was formed by processing a cross-section circular wire rod in the shape of a spiral, as shown in FIG. It may be formed by processing in a spiral shape.

  In the above-described embodiment, both end portions 38A and 38B on both sides in the axial direction of the spiral member 38 protrude in the axial direction of the spiral member 38 with respect to the magnet 40, but both end portions 38A and 38B on both sides in the axial direction. Only one of them may protrude in the axial direction of the spiral member 38 with respect to the magnet 40.

  Further, the spiral member 38 is tightly fixed to the inner peripheral surface 36A of the yoke 36 by being press-fitted inside the yoke 36 while being rotated in the direction of reducing the diameter. The inner peripheral surface 36 </ b> A of 36 may be tightly fixed.

  Further, the yoke 36 is formed in a cylindrical shape, but may have another cross-sectional shape as long as it is cylindrical.

  The spiral member 38 is preferably formed of a ferromagnetic material, but may be other than a ferromagnetic material.

  Note that the plurality of modified examples can be implemented by being combined as appropriate.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Rotary electric machine, 12 ... Armature, 14 ... Front housing, 16 ... Brush apparatus, 18 ... Stator, 22 ... Shaft, 24 ... Commutator, 26. ..Core, 28 ... winding, 30, 32 ... bearing, 34 ... brush, 36 ... yoke, 36A ... inner peripheral surface, 38 ... spiral member, 38A, 38B ..End (axial end), 38C ... inner periphery, 40 ... magnet, 42 ... outer periphery, 44 ... bottom, 46 ... winding part, 48 ... Gap, 50 ... adhesive

Claims (5)

Armature,
A yoke formed in a cylindrical shape and containing the armature;
A helical member that is inserted inside the yoke with the axial direction of the yoke as an axial direction, is fixed to the inner peripheral surface of the yoke, and has elasticity in the radial direction and the axial direction;
A magnet fixed to an inner peripheral portion of the spiral member and opposed to the armature in a radial direction;
Rotating electric machine with The spiral member is coated with an adhesive so that at least part of the spiral gap formed in the spiral member is filled,
The magnet is fixed to the inner peripheral portion of the spiral member via the adhesive.
The rotating electrical machine according to claim 1. The axial end of the spiral member protrudes in the axial direction of the spiral member with respect to the magnet.
The rotating electrical machine according to claim 1 or 2. The spiral member is closely fixed to the inner peripheral surface of the yoke.
The rotary electric machine as described in any one of Claims 1-3. The spiral member is formed of a ferromagnetic material.
The rotary electric machine as described in any one of Claims 1-4.

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