JP2004173440A - Stator structure of rotating electric machine - Google Patents

Abstract

An object of the present invention is to provide a stator structure of a rotating electric machine that can improve the assemblability of the stator and prevent a reduction in efficiency of the rotating electric machine.
A rotating electric machine in which a base (4) of a tooth (3) made of a laminated steel plate is inserted and held in a recess (2) formed in a core back (1) made of a laminated steel plate in the axial direction of the stator in the axial direction of the stator. In the stator structure of the first embodiment, the width of the base portion 4 in the circumferential direction at the front end portion 4a is narrower than the remaining portion 7 at the insertion front end portion 6 from the insertion side end surface to the recess 2 to a predetermined position in the stator axial direction. The recess 2 has an insertion tip fitting portion 8 for fitting the insertion tip portion 6 at the tip 4 a of the base 4 with the opening width in the stator circumferential direction corresponding to the width of the base 4 in the stator circumferential direction. And is formed narrower than the remaining portion 9.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stator structure of a rotating electric machine.
[0002]
[Prior art]
As a conventional stator structure, for example, a structure shown in a perspective view in FIG. 5 is known. This stator structure has a plurality of teeth 51 and a ring-shaped core back 52 that fits and holds these teeth 51 at equal intervals in the circumferential direction, and has a slot 53 between adjacent teeth 51. A stator coil (not shown) is mounted.
[0003]
As shown in a perspective view in FIG. 6, the teeth 51 are made of a laminated steel plate formed by laminating and bonding, caulking, or welding electromagnetic thin plates such as a silicon steel plate, and a notch 56 is formed in a base portion 55 thereof. Have been.
[0004]
As shown in a partial perspective view of FIG. 7, the core back 52 is also made of a laminated steel sheet formed by laminating electromagnetic thin sheets such as a silicon steel sheet and bonding, caulking, or welding to each other. Is formed with a concave portion 57 extending in the stator axial direction F and having a similar shape to the base portion 55 of the tooth 51, and the base portion 55 of the tooth 51 is press-fitted into the concave portion 57 from the stator axial direction. ing.
[0005]
Note that the width of the base portion 55 of the teeth 51 in the stator circumferential direction is the same in the stator axial direction, and the width of the concave portion 57 of the core back 52 in the stator circumferential direction is also the same in the stator axial direction. In addition, the width at the base 55 of the teeth 51 in the circumferential direction of the stator is substantially equal.
[0006]
However, in such a stator structure, since the base 55 of the tooth 51 similarly made of a laminated steel plate is press-fitted into the concave portion 57 of the core back 52 made of the laminated steel plate from the axial direction of the stator, and thus fitted together. The mouth of the mouth and the tightness of the press fit become tight. For this reason, high positioning accuracy is required at the time of assembly, and automatic assembly becomes difficult.
[0007]
As a solution to this problem, a protruding piece with a sloped tip is formed at the base of the tooth, and the inner peripheral side of the core back is slightly larger than the protruding piece of the tooth, and the inner edge is cut diagonally. After forming the missing recess, insert the teeth protruding piece into the core back recess, rotate it toward the inclined portion to engage the inclined portion and the inner edge of the recess, and then weld the engaged portion Alternatively, a stator structure that is fixed by bonding has been proposed (for example, Patent Document 1).
[0008]
[Patent Document 1]
JP-A-7-59278 (paragraph numbers 0017 to 0026, FIGS. 1, 2, and 3)
[0009]
[Problems to be solved by the invention]
However, in the stator structure described in Patent Document 1, since the recess of the core back is larger than the projection of the tooth, an air gap is formed in the recess after the teeth are assembled, and the magnetic permeability at that portion is reduced. As a result, there is a concern that the efficiency of the rotating electrical machine may be reduced due to saturation of the magnetic flux density.
[0010]
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a stator structure of a rotating electric machine that can improve the assemblability of the stator and prevent a decrease in the efficiency of the rotating electric machine.
[0011]
[Means for Solving the Problems]
The invention of a stator structure for a rotating electric machine according to claim 1, which achieves the above object, provides a stator in which a base of a tooth made of a laminated steel sheet is provided in a recess formed in a core back made of a laminated steel sheet so as to extend in a stator axial direction. In the stator structure of a rotating electric machine, which is inserted and held in the axial direction, the base has a width in the circumferential direction of the stator at a distal end thereof, which is the insertion end from the insertion side end face to the concave portion to a predetermined position in the stator axial direction. The portion is formed narrower than the remaining portion, and the recess fits the insertion tip at the tip of the base in such a manner that the opening width in the stator circumferential direction corresponds to the width of the base in the stator circumferential direction. It is characterized in that the insertion tip fitting portion to be combined is formed narrower than the remaining portion.
[0012]
According to the first aspect of the present invention, the insertion front end portion of the tooth base portion is narrow, and the opening width of the entrance portion of the core back recess into which the tooth base portion is inserted is determined by the insertion front end of the tooth base portion. Because the width is wider than the part, the teeth base can be easily inserted into the recess even if the positioning accuracy between the teeth base and the recess is poor when assembling the teeth, and the insertion tip of the teeth base is located at the entrance of the recess. After the insertion, the tooth base can be inserted into the concave portion and fitted with the concave portion as a guide. Therefore, the assemblability of the stator can be improved, automatic assembly can be easily performed, and an undesired air gap can be prevented from being formed in the fitting portion between the tooth base and the core back recess, so that the efficiency of the rotating electric machine can be improved. It is possible to prevent a decrease.
[0013]
According to a second aspect of the present invention, in the stator structure of the rotating electric machine according to the first aspect, the dimension of the concave portion in the axial direction of the stator at the insertion tip fitting portion is A, and the dimension of the base in the axial direction of the stator at the insertion tip portion of the base portion. When the dimension is A 'and the thickness of each steel plate constituting the teeth is D', A '≧ A and A'-A <D' are satisfied.
[0014]
According to the second aspect of the present invention, when the tooth base is inserted into the recess and the insertion side end surface of the tooth base is fitted to the one end surface of the core back and fitted, the stator peripheral portion at the tooth base in the stator axial direction is provided. Between the step portion having a different width in the direction and the step portion having a different width in the circumferential direction of the stator in the concave portion, an air gap less than the thickness of one steel sheet constituting the teeth is formed at the maximum. Thus, formation of an air gap can be further suppressed. In addition, when the step portion of the tooth base is fitted in close contact with the step portion of the concave portion in the stator axial direction, the insertion tip portion of the tooth base is less than the thickness of one steel plate at a maximum. Since it only projects from the end face, it is possible to more reliably prevent a decrease in the efficiency of the rotating electric machine.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a stator structure of a rotating electric machine according to the present invention will be described with reference to FIGS. The arrow F indicates the stator axis direction.
[0016]
1 is a perspective view showing a configuration of a main part of a stator structure, FIG. 2 is a perspective view showing a configuration of a tooth shown in FIG. 1, FIG. 3 is a partial perspective view showing a configuration of a core back, and FIG. It is a figure for explaining the punching process of the steel plate to be performed.
[0017]
In the stator structure of the present embodiment, similarly to the conventional stator structure shown in FIG. 5, concave portions 2 extending in the axial direction are formed at equal intervals in the circumferential direction on the inner peripheral surface side of the ring-shaped core back 1. The bases 4 of the teeth 3 are inserted into the respective recesses 2 in the axial direction of the stator and are fitted and held in the respective recesses 2. A coil side (not shown) of the stator coil is inserted between the adjacent teeth, that is, in the slot 5. It is to be attached. The core back 1 and the teeth 3 are each formed of a laminated steel sheet formed by laminating electromagnetic thin sheets such as a silicon steel sheet and bonding, caulking, or welding.
[0018]
In such a stator structure, in the present embodiment, as shown in FIG. 2, the width of the tip 4 a of the base 4 of the tooth 3 in the circumferential direction of the stator is set in the axial direction of the stator from the insertion side end face of the core back 1 into the recess 2. Is formed narrower than the remaining portion 7 at the insertion tip portion 6 up to the predetermined position.
[0019]
In addition, the opening width of the recess 2 of the core back 1 in the circumferential direction of the stator corresponds to the width of the base 4 of the teeth 3 in the circumferential direction of the stator, as shown in FIG. 6 is formed narrower than the remaining portion 9 in the insertion tip fitting portion 8 into which the fitting 6 is fitted.
[0020]
Here, the dimension in the axial direction of the stator at the insertion end fitting portion 8 of the concave portion 2 is A, the dimension in the axial direction of the stator at the narrow insertion distal portion 6 of the base 4 is A ′, and the thickness of each steel plate constituting the teeth 3. When D 'is D', A '≧ A and A'-A <D' are satisfied.
[0021]
In manufacturing the teeth 3 made of the laminated steel sheet by punching an electromagnetic thin plate, for example, as shown in FIG. 4, the electromagnetic thin plate 11 is provided with a narrow tip punching station 12 having a movable punch, and a movable punch. When the teeth are to be sequentially conveyed to the wide-end punching station 13 and the common-section punching station 14 having the fixed punch, and a tooth piece having the narrow tip 4a is formed, the narrow tip-end punching station 12 is movable. A narrow tip portion 4a is formed in the electromagnetic thin plate 11 by performing punching by projecting the punch, and the next wide tip end punching station 13 passes through the electromagnetic thin plate 11 without retracting and punching the movable punch. At the next common punching station 14, the fixed punch is protruded to narrow the width. Punching teeth common portion 4b continuous from the leading end portion 4a.
[0022]
Further, when forming a tooth piece having a wide distal end portion 4a, the narrow distal end punching station 12 passes the electromagnetic thin plate 11 without retracting and punching the movable punch, and the next wide distal end punching station. A wide end portion 4a is formed on the electromagnetic thin plate 11 by projecting a movable punch at 13 to perform punching, and a fixed punch is protruded at the next common punching station 14 to connect a tooth continuous to the wide end portion 4a. The common part 4b is punched.
[0023]
In this manner, a number of tooth pieces each having a narrow distal end 4a and a number of tooth pieces each having a wide distal end 4a are formed and laminated as shown in FIG. 2, and these are bonded, caulked, or welded. To form the teeth 3. The core back 1 is formed in the same manner as the teeth 3.
[0024]
After the core back 1 and the plurality of teeth 3 are formed in advance as described above, each of the teeth 3 is inserted into each of the recesses 2 of the core back 1 with the narrow distal end 4a side as the insertion distal end side. Is inserted in the axial direction of the stator from the side of the opening width and is fitted and held.
[0025]
As described above, in the present embodiment, the insertion distal end portion 6 at the distal end portion 4a of the base 4 of the tooth 3 is made narrow, and the opening at the entrance portion of the recess 2 of the core back 1 into which the distal end portion 4a of the base 4 is inserted. Since the width is wider than the insertion tip 6, even if the positioning accuracy between the base 4 of the teeth 3 and the recess 2 of the core back 1 during assembly of the teeth is poor, the base 4 can be easily inserted into the recess 2. Can be. Moreover, after the insertion distal end portion 6 is inserted into the entrance portion of the concave portion 2, the base portion 4 can be inserted into the concave portion 2 with the concave portion 2 as a guide and fitted.
[0026]
Further, the dimension in the axial direction of the stator at the insertion end fitting portion 8 of the recess 2 is A, the dimension in the axial direction of the stator at the narrow insertion end portion 6 of the base 4 is A ′, and the thickness of each steel plate constituting the teeth 3 is A. When D ′, A ′ ≧ A and A′−A <D ′ are satisfied, so that the formation of an air gap in the fitting portion between the core back 1 and the teeth 3 can be minimized. it can.
[0027]
That is, when the base 4 of the tooth 3 is inserted into the recess 2 of the core back 1 and the end face of the base 4 of the tooth 3 on the insertion side is fitted to the one end face of the core back 1 and fitted, the axial direction of the stator 3 Between the stepped portion of the base portion 4 of the tooth 3 having a different width in the stator circumferential direction and the stepped portion of the concave portion 2 having a different width in the stator circumferential direction, at most less than the thickness of one steel sheet constituting the tooth 3 Only the air gap is formed, and the expansion of the air gap can be suppressed. When the stepped portion of the base 4 of the tooth 3 is closely fitted to the stepped portion of the recess 2 in the axial direction of the stator, the insertion end portion 7 of the base 4 of the tooth 3 has a thickness of at most one steel plate. Since it only protrudes from the one end surface of the core back 1 by less than that, it is possible to reliably prevent a decrease in the efficiency of the rotating electric machine.
[0028]
Therefore, the assemblability of the stator can be improved, the automatic assembling can be facilitated, and the reduction in the efficiency of the rotating electric machine can be reliably prevented.
[0029]
The present invention is not limited to the above embodiment, but can be variously modified without departing from the spirit of the invention.
[0030]
【The invention's effect】
As described above, according to the present invention, the circumferential width of the stator at the distal end portion of the base of the tooth is set to the remaining portion at the insertion distal end portion from the insertion side end surface of the core back to the concave portion to the predetermined position in the stator axial direction. The width of the opening of the recess of the core back in the circumferential direction of the stator corresponds to the width of the base of the tooth in the circumferential direction of the stator. The fitting portion is formed to be narrower than the remaining portion, and the base of the tooth is inserted into the recess from the stator axial direction so as to be fitted and held. The assemblability can be improved, the formation of an air gap in the fitting portion can be suppressed, and a decrease in the efficiency of the rotating electric machine can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a main part of a stator structure of a rotating electric machine according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a configuration of a tooth shown in FIG.
FIG. 3 is a partial perspective view showing a configuration of a core back.
FIG. 4 is a view for explaining a punching process of a steel plate constituting the teeth shown in FIG. 1;
FIG. 5 is a perspective view showing a configuration of a main part of a conventional stator structure.
FIG. 6 is a perspective view showing a configuration of a tooth shown in FIG. 5;
FIG. 7 is a partial perspective view showing the configuration of the core back.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Core back 2 Depression 3 Teeth 4 Base 4a Tip 4b Common teeth 5 Slot 6 Insertion tip 7 Remaining part 8 Insertion tip fitting part 9 Remaining part

Claims (2)

In a stator structure of a rotating electric machine, a base of a tooth made of a laminated steel sheet is inserted and held in a recess formed by extending a core back made of a laminated steel sheet in a stator axial direction from a stator axial direction,
The base portion has a width in the circumferential direction of the stator at a distal end portion, the insertion distal end portion from the insertion side end surface to the concave portion to a predetermined position in the stator axial direction is formed narrower than the remaining portion,
The recess has an opening width in the stator circumferential direction corresponding to the width of the base in the stator circumferential direction, and the insertion tip fitting portion for fitting the insertion tip portion at the tip of the base is larger than the remaining portion. A stator structure for a rotating electric machine characterized by being formed narrow. The dimension of the recess at the insertion tip fitting portion in the axial direction of the stator is A, the dimension of the base at the insertion tip portion in the axial direction of the stator is A ', and the thickness of each steel plate constituting the teeth is D'. 2. The stator structure according to claim 1, wherein A '≧ A and A'-A <D' are satisfied.

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