JP6180719B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine.

  Conventionally, an armature, a yoke formed by bending a plate material, a 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 are provided. Rotating electric machines are known. In a conventional rotating electrical machine, a joint portion between one end portion and another end portion in the circumferential direction of the yoke is formed linearly along the axial direction of the yoke (see, for example, Patent Document 1).

JP 2001-352700 A

  By the way, in such a rotating electrical machine, an electromagnetic force acts between the current flowing in 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 may cause motor noise.

  Moreover, in the yoke of the conventional rotating electrical machine, the mating portion formed linearly along the axial direction is a portion having lower rigidity than the other portions of the yoke. For this reason, when the excitation force is applied to the magnet as described above and the yoke vibrates in the radial direction, the stress concentrates on the mating portion, and as a result, the vibration of the yoke and, consequently, the motor noise may increase. is there.

  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 formed into a cylindrical shape by bending an armature and at least one plate, and a yoke that houses the armature; A magnet fixed to the inner peripheral surface of the yoke and opposed to the armature in the radial direction, and formed at a mating portion of one end and the other end in the circumferential direction of the yoke, and the axial direction of the yoke Adjacent to each other, and a plurality of stepped portions that are stepwise different from each other in the circumferential direction of the yoke, and provided adjacent to each of the plurality of stepped portions, at one end in the circumferential direction of the yoke A plurality of engagement projections formed, and a plurality of engagement recesses formed at the other end in the circumferential direction of the yoke and respectively engaged with the plurality of engagement projections. And the engaging convex portion adjacent to the stepped portion Said engaging recess and a plurality of pairs respectively constituted for engaging the engaging protrusion is are offset in the circumferential direction of and from each other said yoke forms a stepped, the magnets are of the yoke The mating portion that is formed in an arc shape along the peripheral surface and has the plurality of step portions is formed at a position that overlaps the circumferential direction of the magnet and the yoke .

According to this rotating electrical machine, a plurality of step portions that are adjacent to each other in the axial direction of the yoke and that have different positions in the circumferential direction of the yoke are adjacent to each other in the circumferential direction of the yoke. Is formed. And in this each level | step-difference part, an engaging convex part and an engaging recessed part are engaged, and the matching part is joined. Accordingly, since a plurality of joints in the mating portion are adjacent to each other in the axial direction of the yoke and are displaced from each other in the circumferential direction of the yoke, even when an excitation force due to electromagnetic force is applied to the magnet, the circumferential direction of the yoke It can suppress that stress concentrates on the specific location in. Thereby, the vibration of the yoke can be suppressed.
Further, according to this rotating electric machine, the mating portion having a plurality of step portions is formed at a position where the magnet formed in an arc shape and the yoke overlap in the circumferential direction. Accordingly, the magnet rigidity can be compensated for the decrease in the rigidity of the yoke due to the formation of the mating portion.

Moreover, according to this rotary electric machine, the several level | step-difference part has comprised step shape. Therefore, even when the excitation force resulting from the electromagnetic force is applied to the magnet, the stress generated in the yoke can be dispersed in the circumferential direction of the yoke. Thereby, the vibration of the yoke can be more effectively suppressed.

According to a second aspect of the present invention , in the rotary electric machine according to the first aspect , a rib extending in the circumferential direction is formed on the yoke.

  According to this rotating electrical machine, a rib extending in the circumferential direction is formed on the yoke. Therefore, since the rigidity of the yoke can be increased by the rib, the effect of suppressing the vibration of the yoke can be increased.

The rotating electrical machine according to claim 3 is the rotating electrical machine according to claim 2 , wherein the rib is formed at a position overlapping each of the plurality of stepped portions in the axial direction of the yoke. ing.

  According to this rotating electrical machine, the rib is formed at a position that overlaps each of the plurality of step portions in the axial direction of the yoke. Therefore, since the rigidity of each of the plurality of step portions can be improved by the plurality of ribs, the effect of suppressing the vibration of the yoke can be further enhanced.

The rotating electrical machine according to claim 4 is the rotating electrical machine according to any one of claims 1 to 3 , wherein a width along the axial direction of the yoke in each of the plurality of stepped portions is A, When the shift amount along the circumferential direction of the yoke in a pair of adjacent step portions among the plurality of step portions is B, A ≦ B is set.

  According to this rotating electrical machine, the width A along the axial direction of the yoke in each of the plurality of stepped portions, and the shift amount B along the circumferential direction of the yoke in a pair of adjacent stepped portions among the plurality of stepped portions. The relationship is set to A ≦ B. Accordingly, the distance (shift amount B) between the step portions adjacent to each other in the circumferential direction of the yoke is ensured while suppressing the joining length (width A) by the step portion, so that the stress generated in the yoke can be more effectively reduced. Can be dispersed. Thereby, the effect which suppresses the vibration of a yoke can also be heightened by this.

It is a longitudinal cross-sectional view of the rotary electric machine which concerns on one Embodiment of this invention. It is the figure which looked at the stator and armature shown by FIG. 1 from the axial direction. FIG. 3 is a perspective view of a yoke shown in FIG. 2. It is a two-view figure (a front view and a side view) which shows the board | plate material before forming the yoke shown by FIG. It is a principal part enlarged view of the board | plate material shown by FIG. It is a figure which shows the modification of the yoke shown by FIG. It is a figure which shows the modification of the matching part 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 stator 14, a front housing 16, an end housing 18, and a brush device 20. .

  The armature 12 has a shaft 22, a commutator 24, a core 26, and a winding 28. The shaft 22 is rotatably supported by a pair of bearings 30 and 32 provided in the front housing 16 and the end housing 18, and the commutator 24 and the core 26 are fixed to the shaft 22. The winding 28 is wound around the core 26, and the end portion of the winding 28 is connected to the commutator 24.

  The stator 14 has a yoke 34 and a magnet 36. As will be described later, the yoke 34 is formed in a cylindrical shape by bending a substantially square plate (steel plate). The armature 12 is accommodated inside the yoke 34. As shown in FIG. 2, the magnet 36 is formed in an arc shape along the inner peripheral surface of the yoke 34. The magnet 36 is fixed to the inner peripheral surface of the yoke 34 by, for example, adhesion, and is opposed to the armature 12 in the radial direction. In the present embodiment, as an example, the magnets 36 are provided at positions facing the yoke 34 in the radial direction.

  As shown in FIG. 1, the front housing 16 is fixed to an end portion on one axial side of the yoke 34, and the end housing 18 is fixed to an end portion on the other axial side of the yoke 34. The brush device 20 is fixed to the front housing 16. The brush device 20 includes a brush 38, and the brush 38 is in contact with the commutator 24.

  In the rotating electrical machine 10, when current is supplied to the brush 38, this current flows to the winding 28 via the commutator 24. Further, an electromagnetic force acts between the current flowing in the winding 28 and the magnetic field of the magnet 36, and the armature 12 is rotated.

  Next, a more specific configuration of the yoke 34 will be described.

  As shown in FIG. 3, as an example, the yoke 34 is formed in a cylindrical shape by bending a single plate material 40 having a substantially square shape. As shown in FIG. 4, the plate member 40 that is the material of the yoke 34 is formed by pressing a long material 42. A plurality of plate members 40 are continuously formed from a single material 42.

  As shown in FIG. 3, a plurality of stepped portions 51, 52, and 53 are formed at the mating portion 44 between one end portion 34 </ b> A and the other end portion 34 </ b> B in the circumferential direction of the yoke 34. As an example, the plurality of step portions 51, 52, 53 have a step shape, and the positions of the yoke 34 in the circumferential direction are different from each other. That is, the step portion 52 on the axially central side of the yoke 34 is formed so as to be shifted to one side in the circumferential direction (arrow R1 side) of the yoke 34 with respect to the step portion 51 on one end side of the yoke 34 in the axial direction. The stepped portion 53 on the other axial end side of 34 is formed so as to be shifted from the stepped portion 52 on the axially central side of the yoke 34 to one circumferential side (arrow R1 side) of the yoke 34.

  Further, each of the plurality of step portions 51, 52, 53 is provided with an engaging convex portion 54 and an engaging concave portion 56, respectively. The plurality of engaging convex portions 54 are formed at one end portion 34A (one end portion) in the circumferential direction of the yoke 34, and the plurality of engaging concave portions 56 are other end portions in the circumferential direction of the yoke 34. 34B (the other end) is formed.

  Each engaging convex part 54 is formed in the shape of a tongue piece projecting toward the other end part 34 </ b> B along the circumferential direction of the yoke 34. Each of the engaging projections 54 is formed in a substantially trapezoidal shape so that the width along the axial direction of the yoke 34 increases as it goes toward one side in the circumferential direction of the yoke 34 (arrow R1 side).

  The engaging recess 56 is formed in a cutout shape that opens toward the one end 34 </ b> A in the circumferential direction of the yoke 34. The engaging concave portion 56 is formed in a substantially trapezoidal shape similar to the engaging convex portion 54, and the width along the axial direction of the yoke 34 increases as it goes to one side in the circumferential direction of the yoke 34 (arrow R1 side). It is formed as follows. Then, by engaging the plurality of engaging projections 54 with the plurality of engaging recesses 56, respectively, the joining portion 44 of the one end 34A and the other end 34B in the circumferential direction of the yoke 34 is joined. ing.

  As shown in FIG. 2, the mating portion 44 having the plurality of step portions 51, 52, 53 is formed at a position where the magnet 36 formed in an arc shape and the yoke 34 overlap in the circumferential direction. That is, the mating portion 44 is formed within a range in which the magnet 36 in the circumferential direction of the yoke 34 is provided.

  A plurality of ribs 61A, 61B, 62A, 62B, 63A, 63B extending in the circumferential direction are formed on the outer peripheral surface of the yoke 34. The ribs 61 </ b> A and 61 </ b> B are formed at positions overlapping the stepped portion 51 and the yoke 34 in the axial direction. Similarly, the ribs 62A and 62B are formed at positions where the stepped portion 52 and the yoke 34 overlap in the axial direction, and the ribs 63A and 63B are positions where the stepped portion 53 and the yoke 34 overlap in the axial direction. Are formed respectively.

  Further, the rib 61A is located on both sides of the yoke 34 in the axial direction with respect to the engaging convex portion 54 provided on the step portion 51, and the rib 61B is the engaging convex portion 54 provided on the step portion 51. And the yoke 34 are overlapped in the axial direction. Similarly, the ribs 62 </ b> A are positioned on both sides of the yoke 34 in the axial direction with respect to the engaging convex portions 54 provided on the stepped portion 52, and the ribs 62 </ b> B are engaged engaging portions provided on the stepped portion 52. 54 and the yoke 34 are formed at positions that overlap in the axial direction. The ribs 63A are positioned on both sides in the axial direction of the yoke 34 with respect to the engaging convex portions 54 provided on the stepped portion 53, and the ribs 63B are engaged on the engaging convex portions 54 provided on the stepped portion 53. And the yoke 34 are overlapped in the axial direction.

  Further, the ribs 61A, 62A, 63A form an annular shape along the circumferential direction of the yoke 34 in a state where the mating portion 44 is joined. On the other hand, the ribs 61B, 62B, 63B are formed in a rail shape extending from one end 34A in the circumferential direction of the yoke 34 to the other end 34B. The ribs 61B, 62B, 63B are aligned with each other. In the state in which the portion 44 is joined, the shape in which the engaging convex portion 54 and the engaging concave portion 56 are formed is interrupted.

  In addition, the plurality of step portions 51, 52, and 53 have the following dimension settings. That is, the width along the axial direction of the yoke 34 in each of the plurality of step portions 51, 52, 53 is A, and the circumferential direction of the yoke 34 in a pair of adjacent step portions among the plurality of step portions 51, 52, 53. Is set so that A ≦ B. The widths A of the plurality of step portions 51, 52, 53 are set to be the same. Further, in the plurality of step portions 51, 52, 53, the shift amount B is constant.

  The plurality of step portions 51, 52, 53, the plurality of engaging convex portions 54, the plurality of engaging concave portions 56, and the plurality of ribs 61 A, 61 B, 62 A, 62 B, 63 A, 63 B are the same as the material of the yoke 34. It is formed when the plate material 40 is pressed (see FIG. 4).

  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 one embodiment of the present invention, the yoke 34 is mutually connected to the mating portion 44 between the one end 34A and the other end 34B in the circumferential direction of the yoke 34. A plurality of step portions 51, 52, and 53 having different circumferential positions are formed. And in this level | step-difference part 51-53, the engagement part 44 and the engagement recessed part 56 are engaged, and the matching part 44 is joined. Accordingly, since a plurality of joints are shifted from each other in the circumferential direction of the yoke 34 in the mating portion 44, even when the excitation force F (see FIG. 2) due to electromagnetic force is applied to the magnet 36, It can suppress that stress concentrates on the specific location in a direction. Thereby, the vibration of the yoke 34 can be suppressed.

  In particular, the plurality of step portions 51 to 53 are stepped. Therefore, even when an excitation force resulting from the electromagnetic force is applied to the magnet 36, the stress generated in the yoke 34 can be dispersed in the circumferential direction of the yoke 34. Thereby, the vibration of the yoke 34 can be suppressed more effectively.

  In addition, the yoke 34 is formed with a plurality of ribs 61A, 61B, 62A, 62B, 63A, 63B extending in the circumferential direction. Therefore, since the rigidity of the yoke 34 can be increased by the plurality of ribs 61A to 63B, the effect of suppressing the vibration of the yoke 34 can be increased.

  The plurality of ribs 61 </ b> A to 63 </ b> B are formed at positions that overlap each of the plurality of step portions 51 to 53 in the axial direction of the yoke 34. Therefore, since the rigidity of each of the plurality of step portions 51 to 53 can be improved by the plurality of ribs 61A to 63B, the effect of suppressing the vibration of the yoke 34 can be further enhanced.

  Further, since the vibration of the yoke 34 can be suppressed by the plurality of step portions 51 to 53 having the engaging convex portion 54 and the engaging concave portion 56 and the plurality of ribs 61A to 63B, the yoke 34 can be thinned. become. Thereby, the yoke 34 can be reduced in weight.

  Further, the width A along the axial direction of the yoke 34 in each of the plurality of step portions 51 to 53 and the shift amount along the circumferential direction of the yoke 34 in a pair of adjacent step portions among the plurality of step portions 51 to 53. The relationship with B is set to A ≦ B. Therefore, since the gap (shift amount B) between the step portions 51 to 53 adjacent to each other in the circumferential direction of the yoke 34 is widely secured while suppressing the joining length (width A) by the step portions 51 to 53, the yoke 34 is secured. Can be more effectively dispersed. Thereby, the effect of suppressing the vibration of the yoke 34 can also be enhanced by this.

  The mating portion 44 having a plurality of step portions 51 to 53 is formed at a position where the magnet 36 formed in an arc shape and the yoke 34 overlap in the circumferential direction. Accordingly, the magnet 36 can compensate for the rigidity reduction of the yoke 34 due to the formation of the mating portion 44.

  In addition, since the plurality of plate members 40 are formed from the material 42 so that the longitudinal direction of the material 42 coincides with the circumferential direction of the yoke 34, processing with a high yield is possible.

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

  In the above-described embodiment of the present invention, the yoke 34 is formed in a cylindrical shape by bending a single plate member 40. For example, as shown in FIG. It may be formed in a cylindrical shape by bending or bending three or more plate materials. That is, the yoke 34 may be formed in a cylindrical shape by combining a plurality of plate members 40 bent in an arc shape. Also in this case, the structure of the mating portion 44 is the same as described above.

  Further, the yoke 34 is formed in a cylindrical shape, but may have another cross-sectional shape as long as it is cylindrical.

Further, the stepped portions 51 to 53 are stepped so that the positions in the circumferential direction of the yoke 34 are different from each other. For example, as shown in FIG. If the circumferential positions of the yokes 34 are different from each other, the stepped shape may not be formed (a shape other than the stepped shape may be used). The modification shown in FIG. 7 is a reference example.

  Moreover, although the three level difference parts 51-53 were formed in the matching part 44, the number of several level difference parts may be others.

  Further, the plurality of step portions 51 to 53 are sequentially shifted to one side in the circumferential direction of the yoke 34 (in the direction of arrow R1 in FIG. 3), but sequentially in the circumferential direction other side of the yoke 34 (in the direction of arrow R2 in FIG. 3). It may be shifted.

  Further, although the widths A of the plurality of step portions 51 to 53 are set to be the same as each other, they may be different from each other. Similarly, in the plurality of step portions 51 to 53, the shift amount B is constant, but may be different from each other.

  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 ... Stator, 16 ... Front housing, 18 ... End housing, 20 ... Brush apparatus, 22 ... Shaft, 24. .... Commutator, 26 ... Core, 28 ... Winding, 30, 32 ... Bearing, 34 ... Yoke, 34A ... One end, 34B ... Other end, 36 ... Magnet, 38 ... Brush, 40 ... Plate material, 42 ... Material, 44 ... Matching part, 51, 52, 53 ... Step part, 54 ... Engaging convex part 56 ... engaging recess, 61A, 61B, 62A, 62B, 63A, 63B ... ribs

Claims (4)

Armature,
A yoke that is formed into a cylindrical shape by bending at least one plate, and accommodates the armature;
A magnet fixed to the inner peripheral surface of the yoke and facing the armature in a radial direction;
A plurality of steps formed in a joint portion between one end portion and the other end portion in the circumferential direction of the yoke, and adjacent to each other in the axial direction of the yoke, differing from each other in the circumferential direction of the yoke and forming a stepped shape. And
A plurality of engaging convex portions provided adjacent to each of the plurality of stepped portions and formed at one end in the circumferential direction of the yoke;
A plurality of engaging recesses formed at the other end in the circumferential direction of the yoke and respectively engaged with the plurality of engaging protrusions;
With
A plurality of sets each constituted by the stepped portion, the engaging convex portion adjacent to the stepped portion, and the engaging concave portion engaged with the engaging convex portion form a step shape and mutually Offset in the circumferential direction of the yoke ,
The magnet is formed in an arc shape along the inner peripheral surface of the yoke,
The mating portion having the plurality of step portions is formed at a position overlapping the magnet and the yoke in the circumferential direction.
Rotating electric machine. Ribs extending in the circumferential direction are formed on the yoke,
The rotating electrical machine according to claim 1. The rib is formed at a position overlapping each of the plurality of stepped portions in the axial direction of the yoke,
The rotating electrical machine according to claim 2. When the width along the axial direction of the yoke in each of the plurality of stepped portions is A, and the shift amount along the circumferential direction of the yoke in a pair of adjacent stepped portions among the plurality of stepped portions is B , A ≦ B is set,
The rotary electric machine as described in any one of Claims 1-3.

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