JP2008178191A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To favorably eliminate imbalance in weight due to an eccentric shaft portion and facilitate the assembling of an insulating member. <P>SOLUTION: An electric motor includes a laminated core 41 fixed on a rotating shaft having the eccentric shaft portion decentered from the shaft center; the insulating member attached to an end of the laminated core 41 in the direction of lamination; and a magnet wire wound on the laminated core 41 through the insulating member. The laminated core 41 includes: multiple core members 41A; and cut core members 41B<SB>1</SB>, 41B<SB>2</SB>that have a cut portion 41d formed by cutting off part of a core member 41A and eliminates imbalance in weight produced by the eccentric shaft portion. The cut core members 41B<SB>1</SB>, 41B<SB>2</SB>are disposed inside at least a core member 41A, disposed at an end of the laminated core 41 in the direction of lamination, in the direction of lamination. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric motor, for example, an electric motor suitable for use in a vehicle brake hydraulic pressure control device.

  An electric motor that functions as a power source of a reciprocating pump mounted on a base body of a vehicle brake hydraulic pressure control device has an eccentric shaft portion that drives a plunger of the reciprocating pump on a rotating shaft. In an electric motor having such an eccentric shaft portion, an unbalance in weight due to the eccentric shaft portion occurs during rotation, and vibration caused by this causes noise. For this reason, conventionally, a member for canceling the weight imbalance due to the eccentric shaft portion is attached to the laminated core fixed to the rotating shaft, or the core member laminated at the stacking direction end portion of the laminated core is partially attached. By deleting, the balance of the weight of the laminated core is adjusted (for example, refer to Patent Document 1).

Specifically, in this electric motor, the balance of the weight of the laminated core is adjusted by notching the core member of the laminated core to a predetermined size over a plurality of pieces from the end of the laminated core, and by the eccentric shaft portion. The weight imbalance during rotation is negated.
JP-A-6-6944

  However, in Patent Document 1, a cut portion having a predetermined size is formed at the end portion of the laminated core. Therefore, when an insulating member is assembled to the end portion of the laminated core, a gap formed by the cut portion is formed inside the insulating member. As a result, the insulating member may be bent or distorted toward the cut portion due to the tension of the wound magnet wire (armature winding).

In this case, a protrusion that can be disposed in the gap is provided inside the insulating member, and the insulating member is assembled to the laminated core so that the protrusion is disposed in the gap. It is possible to withstand.
However, with such a configuration, when the insulating member is assembled to the laminated core, the protrusion of the insulating member must be aligned with the gap of the laminated core, which causes a problem that the assembling work becomes extremely complicated.
In particular, the cut portion formed in the laminated core is difficult to visually distinguish during assembly, and the assembly work is complicated.

  From such a viewpoint, it is an object of the present invention to provide an electric motor that can suitably cancel out an unbalance in weight due to an eccentric shaft portion and can be easily assembled with an insulating member.

  The present invention that solves such a problem is attached to a rotating shaft having an eccentric shaft portion that is eccentric with respect to the shaft center, a laminated core fixed to the rotating shaft, and an end portion of the laminated core in the lamination direction. An insulating motor, and a magnet wire wound around the laminated core via the insulating member, wherein the laminated core includes a plurality of core members and a part of the core member. A cut core member that has a cut portion formed by cutting and cancels the weight imbalance caused by the eccentric shaft portion, and the cut core member is at least in the stacking direction of the stacked cores. It is characterized by being arranged inside the stacking direction with respect to the core member arranged at the end.

According to this electric motor, the cut core member that cancels the imbalance of the weight caused by the eccentric shaft portion is configured to be disposed on the inner side in the stacking direction than the core member disposed at the end portion in the stacking direction of the stacked core. Therefore, the cut part of the cut core member is not located at the end of the laminated core in the lamination direction. Therefore, the end portion in the stacking direction of the stacked core is shaped so as not to have irregularities due to the cut-out portion, and the insulating member is provided like a conventional case where a protrusion corresponding to the cut-out portion is provided on the inner side of the insulating member. When assembling to the laminated core, it is not necessary to align the assembling between the insulating member and the laminated core. This simplifies mounting when assembling the insulating member to the laminated core and improves productivity.
In addition, since the insulating member is supported by the core member without the cut portion, it is possible to prevent the insulating member from being bent or distorted, and to realize a stable long-term operation of the electric motor.

  Further, according to the present invention, the cut core member is disposed in the vicinity of the end portion on the side close to the eccentric shaft portion in the stacking direction of the laminated core, the eccentric shaft center of the eccentric shaft portion, and the cutting portion It is preferable that the central portion coincides with the radial direction of the laminated core.

  According to this electric motor, since the eccentric shaft center of the eccentric shaft portion and the central portion of the cut portion coincide with the radial direction of the laminated core, the unbalance of the weight when the eccentric shaft portion is stationary and rotating is more suitable. It is possible to cancel out and to realize stable rotation.

  Further, in the present invention, the cut core member is also disposed in the vicinity of the end portion on the side far from the eccentric shaft portion in the stacking direction of the laminated core, and the cut disposed on the side close to the eccentric shaft portion. The core member and the cut core member disposed on the side far from the eccentric shaft portion are configured such that the cut portions are opposed to each other with the shaft center of the rotating shaft interposed therebetween. Is good.

  According to the electric motor configured as described above, since the cut portions are arranged so as to face each other across the axis of the rotation shaft, weight imbalance by providing the eccentric shaft portion, particularly during rotation The weight imbalance can be canceled out more favorably, and stable rotation can be realized.

  Further, in the present invention, the cut core member closer to the eccentric shaft portion is configured such that the cut portion is formed larger than the cut portion of the cut core member far from the eccentric shaft portion. It is good to do.

  According to the electric motor configured as described above, it is possible to optimize the balance of weight at the time of stationary and rotation by providing the eccentric shaft portion, and it is possible to realize further stable rotation.

  In the present invention, it is preferable that the cut core member is continuously laminated in at least one place of the laminated core. According to the electric motor configured as described above, at least one location of the laminated core, the cut portion is continuous in the lamination direction of the laminated core, and the weight is unbalanced by providing the eccentric shaft portion, particularly the weight during rotation. Unbalance can be suitably canceled, and stable rotation can be realized. Moreover, since the cut core member is continuously laminated when the laminated cores are laminated, the workability when forming the laminated core can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to cancel the weight imbalance by an eccentric shaft part suitably, the electric motor with which an assembly | attachment of an insulating member is easy is obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. In the following embodiments, an electric motor used in a vehicle brake hydraulic pressure control device is illustrated, but the application of the electric motor according to the present invention is not limited.

(First embodiment)
As shown in FIG. 1, the electric motor M according to the present embodiment is applied to a vehicle brake hydraulic pressure control device U and serves as a power source for a reciprocating pump P mounted on a base body 100. It is integrally fixed to one surface of 100.

  In addition to the electric motor M, the base 100 has a reciprocating pump P, a normally open solenoid valve 101, a normally closed solenoid valve 102, a pressure sensor 103, A reservoir 104, a control housing 105, and the like are attached. As shown in FIG. 2, the control housing 105 includes a control board 106 for controlling the electric motor M and the electromagnetic valves 101 and 102, a connection terminal 107 for supplying electric power to the electric motor M, and the electromagnetic valves 101 and 102. The electromagnetic coil 108 and the like for driving are accommodated.

  The electric motor M includes a motor housing 10, a stator 20, a rotating shaft 30, a rotor 40, a commutator (commutator) 50, a brush 60, and the like.

  The motor housing 10 includes a yoke 11 that is formed in a substantially bottomed cylindrical shape, and a cover 12 that covers the opening of the yoke 11. A ball bearing 11 b is fixed to the bottom of the yoke 11. A ball bearing 12 a is fixed inside the cover 12.

  The rotating shaft 30 is provided on a main shaft portion 31 rotatably supported by the ball bearings 11 b and 12 a, an eccentric shaft portion 32 projecting from an end surface of the main shaft portion 31, and an end surface of the eccentric shaft portion 32. And a distal end shaft portion 33. A ball bearing 32a that is in contact with a plunger (not shown) of the reciprocating pump P shown in FIG. 1 is fitted in the eccentric shaft portion 32 so that the plunger can reciprocate between the eccentric shaft portion 32 and the ball bearing 32a. The eccentric cam is configured. The tip shaft portion 33 is coaxially supported by the main shaft portion 31 and is rotatably supported by a ball bearing 33 a fixed to the mounting hole 110 of the base body 100. A seal member 111 is interposed between the base body 100 and the electric motor M.

  The rotor 40 includes a laminated core 41 fitted in the main shaft portion 31 of the rotating shaft 30, insulators 42 a and 42 b as insulating members covering the laminated core 41, and a magnet wound around a slot formed in the laminated core 41. And a wire (armature winding) 43. The rotor 40 is located on the inner peripheral side of the stator 20.

As shown in FIG. 3, the laminated core 41 is formed by laminating a plurality of core members 41 </ b> A and cut core members 41 </ _b > B ₁ and 41 </ _b > B ₂ , and insulators 42 a and 42 b are assembled at both ends in the laminating direction. In addition, an insertion hole 41 c through which the main shaft portion 31 (see FIG. 2, hereinafter the same) is inserted is formed at the center of the laminated core 41. Here, the cut core members 41B ₁ and 41B ₂ are disposed on the inner side in the stacking direction than the core member 41A disposed at the end of the stacked core 41 in the stacking direction. Incidentally, cut core member _41B 1, 41B _2, since it is formed in the same shape, the description will be mainly given to cut the core member 41B ₁ in the following description.

As shown in FIG. 4, the core member 41 </ b> A has an annular portion 411 and a plurality of teeth pieces 41 a provided radially from the annular portion 411, and the insertion hole 41 c (see FIG. 3) at the center portion. A hole 41c _{1 to} be formed is formed. As will be described later, a magnet wire 43 (see FIG. 2) is wound around the laminated teeth piece 41a via the insulators 42a and 42b in a state where the laminated core 41 is configured. The pore walls of the hole 41c _1, grooves 41c ₂ that spline engages (not shown) formed on the main shaft 31 are formed.

The cut core members 41B ₁ and 41B ₂ are sandwiched between the core members 41A that are laminated in the laminated core 41 and constitute the laminated core 41 as described above, and the eccentric shaft portion 32 in the laminated direction of the laminated core 41. It is arranged in the vicinity of the end portion (hereinafter referred to as one end portion) close to (see FIG. 2).
Cut the core member 41B ₁ has a shape formed by cutting a portion of the core member 41A. In other words, cut core member 41B ₁ has a cutout 41d which is formed by cutting a portion of the core member 41A, by the cutouts 41d, the eccentric shaft portion 32 of the rotary shaft 30 during rotation (Fig. 2 It has a function to cancel the weight imbalance caused by reference (the same shall apply hereinafter). In the present embodiment, by a short tooth pieces 41a ₁ by cutting the tooth pieces 41a, cut portions 41d are formed. The size of the cut portion 41d which is formed (number and ablation length of the tooth pieces 41a ₁₎ is eccentric amount of the eccentric shaft portion 32 is appropriately set in consideration of the weight or the like of the laminated core 41. In this example, the circumferential direction of three to form the teeth piece 41a proximal portion near three teeth pieces 41a ₁ was excised from (the vicinity of the annular portion 411) the adjacent to and forms a cut portion 41d.

As described above, the cut core member 41 </ b> B ₁ is arranged on the one end side of the laminated core 41 and on the inner side in the lamination direction than the core member 41 </ b> A arranged at one end of the laminated core 41. Here, the two cut core members 41B ₁ and 41B ₂ are continuously arranged (overlaid) with the same position of the cut portion 41d, and as shown in FIG. When viewed from the stacking direction, the positional relationship between the eccentric shaft center O2 of the eccentric shaft portion 32 and the central portion (circumferential center portion (centroid of the cut portion 41d)) T1 of the cut portion 41d is the laminated core 41. It is arrange | positioned so that it may correspond with radial direction. That is, the cut core members 41B ₁ and 41B ₂ are positioned such that the central portion T1 of the cut portion 41d is positioned on the extension of the straight line L1 that extends from the axis O1 of the rotating shaft 30 through the eccentric axis O2. It is aligned and stacked.
The positional relationship between the eccentric shaft center O2 of the eccentric shaft portion 32 and the center portion T1 of the cut portion 41d contributes to more suitably canceling the weight imbalance when the eccentric shaft portion 32 is stationary and rotating. To do.

As shown in FIG. 4, the insulators 42 a and 42 b are made of an insulating material, for example, a resin molding material. A bottomed cylindrical base portion 421 and a radial cover portion 422 formed integrally with the base portion 421. And. An insertion hole portion 423 through which the main shaft portion 31 of the rotating shaft 30 is inserted is formed in the base portion 421. The cover 422 has a plurality of side walls 424 protruding therefrom. The side wall 424 is inserted between the adjacent tooth pieces 41a of the laminated core member 41A and the cut core members 41B ₁ and 41B ₂ so as to cover the side wall surface formed by the tooth pieces 41a. The side walls 424 are formed integrally with a pair of adjacent side walls 424, as shown in the insulator 42b illustrated in FIG. 4 with the side attached to the laminated core 41 facing the front side. It has a substantially C shape in plan view.
When such insulators 42a and 42b are assembled to the laminated core 41, as shown in FIG. 3, each end 41b of the teeth piece 41a (the outer peripheral surface of the laminated core 41) is exposed at the end of each side wall 424. It is supposed to be.

  As shown in FIG. 2, the commutator 50 is fitted in the main shaft portion 31 between the rotor 40 and the ball bearing 12 a and rotates together with the main shaft portion 31. The brush 60 contacts the outer peripheral surface of the commutator 50.

  The brush 60 is movably accommodated in the brush accommodating portion 73 while being urged toward the commutator 50 by a coil spring 73b serving as a brush spring. It comes in contact with the outer peripheral surface.

The brush holder 70 has a holder main body 70A and a rod-like portion 70B protruding from the holder main body 70A, and is fixed by fitting the holder main body 70A into the yoke 11 between the cover 12 and the rotor 40. The
When the electric motor M is assembled to the base body 100, the rod-like part 70 </ b> B is inserted into the insertion hole 109 formed in the base body 100, and the tip portion protrudes toward the control housing 105 side. The rod-like portion 70B includes two power supply paths 78 made of a conductor (only one is shown), and the base end portion of the connection terminal 70c projects from the holder body 70A into the rod-like portion 70B. In addition, the tip portion is connected to the connection terminal 107 of the control housing 105 when the electric motor M is assembled to the base body 100.

As shown in FIG. 4, the laminated core 41 of the electric motor M configured as described above is obtained by laminating a predetermined number of core members 41A and cut core members 41B ₁ and 41B ₂ so as to be integrated. It is formed by fixing to (fixing by caulking etc.). Here, as described above, the cut core members 41B ₁ and 41B ₂ are arranged on the one end portion side of the laminated core 41 so as to be inside in the lamination direction with respect to the core member 41A arranged at one end portion of the laminated core 41. It is arranged near one end.

And the insulators 42a and 42b are assembled | attached to the both ends of the lamination direction of the laminated core 41 assembled. Here, since the cut core members 41B ₁ and 41B ₂ are not disposed at one end of the laminated core 41 and the cut portion 41d is not positioned, when the insulator 42a is assembled to the one end, Insulator 42a can be easily assembled without requiring such complicated positioning. Further, the rotor 40 is manufactured by winding the magnet wire 43 around the slot formed in the laminated core 41.

Next, as shown in FIG. 6, the rotor 40 and the commutator 50 assembled in this way are pressed into the rotating shaft 30 and assembled. In this case, as shown in FIG. 5, the positional relationship between the eccentric shaft center O2 of the eccentric shaft portion 32 and the central portion (circumferential center portion) T1 of the cut portion 41d coincides with the radial direction of the laminated core 41. Assemble as follows. Then, as shown in FIG. 6, the brush 60 and the like are assembled to the brush holder 70, and the brush holder 70 is inserted into the rotating shaft 30. Further, the cover 12 into which the ball bearing 12a is press-fitted is press-fitted into the rotary shaft 30 and assembled. Finally, the cover 12 is press-fitted into the yoke 11 on which the ball bearing 11b and the stator 20 are fixed in advance. . Then, a bearing 32a (see FIG. 2) is press-fitted into the eccentric shaft portion 32 of the rotary shaft 30 and assembled.
Thereby, the electric motor M is manufactured.

According to the electric motor M according to this embodiment configured as described above, the cut core members 41B ₁ and 41B ₂ that cancel the weight imbalance caused by the eccentric shaft portion 32 are arranged at one end portion of the laminated core 41. Since the configuration is arranged on the inner side in the stacking direction than the core member 41A, the cut portion 41d (cut portion space 41D1) of the cut core members 41B ₁ and 41B ₂ is not positioned at one end portion of the stacked core 41. Therefore, one end portion of the laminated core 41 is shaped so as not to be uneven by the cut portion 41d, and when the insulator 42a is assembled to the laminated core 41, a protrusion corresponding to the cut portion is formed on the inner side of the conventional insulating member. There is no need to perform positioning as in the case of providing a portion. This simplifies mounting when assembling the insulator 42a to the laminated core 41 and improves productivity.
Moreover, the deflection and distortion of the insulators 42a and 42b can be prevented, and stable operation of the electric motor M can be realized in the long term.

  Further, the eccentric shaft center O2 of the eccentric shaft portion 32 and the center portion T1 of the cut portion 41d coincide with the radial direction of the laminated core 41 when viewed from the laminated direction of the laminated core 41. The imbalance of the weight at the time of stationary and rotation can be canceled more suitably, and stable rotation can be realized.

In addition, since the cut core members 41B ₁ and 41B ₂ are continuously stacked, the two cut portions 41d are continuously formed in the stacking direction of the stacked core 41 so that one large cut portion space 41D1 is formed. Thus, the imbalance of the weight at the time of rotation of the eccentric shaft portion 32 can be preferably canceled out, and stable rotation can be realized. Moreover, since the cut core members 41B ₁ and 41B ₂ are continuously laminated when the laminated core 41 is laminated, workability when forming the laminated core 41 can be improved.

In addition, when the electric motor M is small, it is difficult to configure so as to cancel the weight imbalance by attaching a member around the laminated core 41 in a limited space in the yoke 11. Thus, the cut core members 41B ₁ and 41B ₂ are provided on the inner side in the stacking direction of the core member 41A at one end of the stacked core 41 so as to cancel the weight imbalance while preventing the insulators 42a and 42b from being bent or distorted. The configuration is effective in further reducing the size of the electric motor M.

Also, it was confirmed that in the above embodiment, three teeth pieces 41a adjacent in the circumferential direction to form a three teeth pieces 41a ₁ and excised from its proximal end near, it has formed the cut portion 41d, which is limited to Instead, the teeth pieces 41a may be cut every other piece or _{every other} piece in the circumferential direction to form the teeth pieces 41a1, and a plurality of cut portions 41d may be formed.

(Second Embodiment)
Next, an electric motor according to a second embodiment of the present invention will be described.
The difference between the electric motor M of the present embodiment and the first embodiment is that, as shown in FIG. 7, in addition to the cut core members 41B ₁ and 41B ₂ described above, the eccentric shaft portion in the stacking direction of the stacked core 41 ′. Cut core members 41B ₃ and 41B ₄ are arranged in the vicinity of an end portion (hereinafter referred to as the other end portion) far from 32, and a cut portion 41d ′ (cut portion space 41D2) is formed also on the other end side. It is a point constructed as described above, and there is no change in other points.

As shown in FIG. 8, the laminated core 41 ′ is formed by laminating cut core members 41B ₃ and 41B ₄ in addition to a plurality of core members 41A and cut core members 41B ₁ and 41B _2, and at both ends in the laminating direction. Insulators 42a and 42b are assembled. Here, as described above, the cut core members 41B ₁ and 41B ₂ are disposed on the inner side in the stacking direction than the core member 41A disposed at one end of the stacked core 41 ′, and the cut core member 41B. _3, 41B ₄ are arranged on the inner side in the lamination direction than the core member 41A which is disposed at the other end of the laminated core 41 '.
In the present embodiment, the cut portions 41d of the cut core members 41B ₁ and 41B _{2 on} the one end side are set to be larger than the cut portions 41d ′ provided on the cut core members 41B ₃ and 41B ₄ on the other end side. Has been. That is, a cut portion space 41D2 that is smaller than the cut portion space 41D1 on the one end side is formed on the other end side far from the eccentric shaft portion 32. In addition, since the cut core members 41B ₃ and 41B ₄ are formed in the same shape, the cut core member 41B ₃ will be mainly described in the following description.

Cut the core member 41B ₃ is sandwiched core member 41A constituting the laminated core 41 are laminated on the laminated core 41 'in like. Cut the core member 41B ₃ is, although the cut core member 41B ₁ basically shape the same, 'tooth pieces 41a to form the' cut portion 41d is cut in the cut core member 41B ₁ whose cut position has the compared to the cutting positions of the teeth piece 41a ₁ which forms a part 41d is a front end portion side of the teeth piece 41a. As a result, the volume of the cut portion space 41D2 formed on the other end side by the two cut core members 41B ₃ and 41B ₄ is smaller than the cut portion space 41D1 on the one end side. The size of the cut portion 41d ′ to be formed (the number of teeth 41a ′ and the cut length) depends on the eccentric amount of the eccentric shaft portion 32, the weight of the laminated core 41 ′, the size of the cut portion space 41D1, and the like. It is set as appropriate in consideration. In this example, three teeth pieces 41a adjacent to each other in the circumferential direction are cut to form three teeth pieces 41a ′, thereby forming a cut portion 41d ′.

As described above, the cut core members 41B ₃ and 41B ₄ are disposed on the inner side in the stacking direction with respect to the core member 41A disposed at the other end of the stacked core 41 ′. 41 'has a configuration in which cut core members 41B ₁ and 41B ₂ and cut core members 41B ₃ and 41B ₄ are arranged near both ends. Here, the two cut core members 41B ₃ and 41B ₄ are continuously arranged with the same position of the cut portion 41d ′, and as shown in FIG. 9, the stacking direction of the stacked core 41 ′ When viewed from above, the excision part 41d and the excision part 41d ′ are arranged so as to oppose each other across the axis O1 of the rotary shaft 30 (arranged on the opposite side in the radial direction). That is, the two cut core members 41B ₃ and 41B ₄ sandwich the axis O1 of the rotation shaft 30 and cut the cut portion 41d on the extension of the straight line L2 passing through the axis O1 and the center portion T1 of the cut portion 41d. The center portion T2 (the center portion in the circumferential direction (centroid in the cut portion 41d ')) is aligned and stacked. Further, when viewed from the stacking direction of the stacked core 41, the eccentric shaft center O2 of the eccentric shaft portion 32 is located closer to the center portion T1 of the cut portion 41d than the shaft center O1 of the rotating shaft 30 on the straight line L2. Yes. That is, the eccentric shaft center O2 of the eccentric shaft portion 32 and the central portion T1 of the cut portion 41d coincide with the radial direction of the laminated core 41.
The positional relationship between the center portion T1 of the cut portion 41d and the center portion T2 of the cut portion 41d ′ is more suitable for weight imbalance by providing the eccentric shaft portion 32, particularly weight unbalance during rotation. Contributes to countering.

As shown in FIG. 8, the laminated core 41 ′ of the electric motor M configured as described above is obtained by laminating a plurality of core members 41 </ b> A and cut core members 41 </ b> B _{1 to} 41 </ b> B ₄ at predetermined positions. It is formed by fixing (caulking and fixing) so as to be integrated. Here, as described above, the cut core members 41B _{1 to} 41B ₄ are arranged on the inner side in the laminating direction than the core members 41A arranged at both ends of the laminated core 41 ′, and the cut core members 41B _{1 to} 41B ₄ are arranged in the laminating direction of the laminated core 41 ′. It is comprised so that core member 41A may be located in both ends.
Therefore, both end portions of the laminated core 41 ′ are shaped so as not to have irregularities due to the cut portions 41d and 41d ′, and when the insulators 42a and 42b are assembled to the laminated core 41 ′, the inner side of the conventional insulating member is not formed. Thus, there is no trouble of performing alignment as in the case of providing a protrusion corresponding to the cut portion. As a result, mounting when the insulators 42a and 42b are assembled to the laminated core 41 ′ is simplified and productivity is improved.
Moreover, the deflection and distortion of the insulators 42a and 42b can be prevented, and stable operation of the electric motor M can be realized in the long term.

  Further, since the cut portions 41d and 41d ′ are disposed so as to face each other across the axis O1 of the rotating shaft 30 when viewed from the stacking direction of the stacked core 41 ′, the eccentric shaft portion 32 is provided. The weight unbalance due to the rotation, particularly the weight unbalance during rotation, can be canceled more suitably, and stable rotation can be realized.

In addition, the cut core members 41B ₁ and 41B ₂ on the one end side that is closer to the eccentric shaft portion 32 have the cut portions 41d on the other end portions farther from the eccentric shaft portion 32 than the cut core members 41B ₃ and 41B. because it is larger than the _fourth cut portion 41d ', it is possible to optimize the weight balance during rest and rotation due to the provision of the eccentric shaft portion 32, it is possible to realize a rotation more stable .

In the present embodiment, the number of the cut core members 41B _{1 to} 41B ₄ is two at each end of the laminated core 41 ′. However, the present invention is not limited to this. The number of the other end portion may be two as well as three. In addition, the sizes of the cut portions 41d and 41d ′ can be appropriately selected and set, and the cut core members 41B _{1 to} 41B ₄ may be formed in different sizes.

Moreover, in this embodiment, the three teeth pieces 41a adjacent in the circumferential direction are excised to form the three teeth pieces 41a ₁ (41a ′), and the excised portion 41d (41d ′) is formed. There is no limitation, and the teeth pieces 41a are cut every other piece or _{every other} piece in the circumferential direction to form teeth pieces 41a ₁ (41a ′), and a plurality of cut portions 41d (41d ′) are formed. May be.

1 is an exploded perspective view showing a vehicle brake hydraulic pressure control device using an electric motor according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded side sectional view showing a vehicle brake hydraulic pressure control device in which an electric motor according to a first embodiment of the present invention is used. It is the expansion perspective view which showed the laminated core which assembled | attached the insulator. It is a disassembled perspective view of a rotor (magnet wire omitted). It is a schematic diagram which shows the positional relationship of an eccentric shaft part and a cutting part. It is explanatory drawing at the time of an assembly | attachment. It is a decomposition side sectional view showing the brake fluid pressure control device for vehicles in which the electric motor concerning a 2nd embodiment of the present invention was used. It is a disassembled perspective view of a rotor (magnet wire omitted). It is a schematic diagram which shows the mutual positional relationship of the cutting part provided in the both ends of the laminated core.

Explanation of symbols

M the electric motor 10 motor housing 11 yoke 30 rotates shaft 31 main shaft 32 eccentric shaft 40 rotor 41 laminated core 41A core member 41a teeth pieces 41a _1, 41a 'teeth pieces 41d, 41d' cutouts 41D1,41D2 cutout space 42a 42b Insulator (insulating member)
43 Magnet Wire 100 Base 41B ₁ , 41B ₂ Cut Core Member 41B ₃ , 41B ₄ Cut Core Member M Electric Motor O1 Axis O2 Eccentric Axis T1, T2 Center U U Brake Brake Pressure Control Device

Claims (5)

A rotating shaft having an eccentric shaft portion eccentric with respect to the shaft center;
A laminated core fixed to the rotating shaft;
An insulating member attached to an end of the laminated core in the lamination direction;
An electric motor comprising a magnet wire wound around the laminated core via the insulating member,
The laminated core is
A plurality of core members, and a cut core member having a cut portion formed by cutting a part of the core member and canceling the weight imbalance caused by the eccentric shaft portion.
The electric motor according to claim 1, wherein the cut core member is disposed at an inner side in the stacking direction than at least the core member disposed at an end portion of the stacked core in the stacking direction.   The cut core member is disposed in the vicinity of the end near the eccentric shaft portion in the stacking direction of the laminated core, and the eccentric shaft center of the eccentric shaft portion and the central portion of the cut portion are The electric motor according to claim 1, wherein the electric motor matches a radial direction of the laminated core. The cut core member is also disposed in the vicinity of the end portion on the side far from the eccentric shaft portion in the stacking direction of the stacked core,
The cut core member disposed on the side closer to the eccentric shaft portion and the cut core member disposed on the side farther from the eccentric shaft portion are configured such that the cut portion is located on both sides of the shaft center of the rotating shaft. The electric motor according to claim 2, wherein the electric motor is disposed so as to oppose to the electric motor.   The cut core member on the side close to the eccentric shaft portion is formed such that the cut portion is larger than the cut portion of the cut core member on the side far from the eccentric shaft portion. 3. The electric motor according to 3.   The electric motor according to any one of claims 1 to 4, wherein a plurality of the cut core members are continuously stacked at least at one position of the stacked core.

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