JP5271991B2 - Rotating electric machine stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive stator of a rotary electric machine, whose assembly is easy and in which winding is prevented from dropping in a gap between adjacent insulators. <P>SOLUTION: In the stator of the rotary electric machine, a notch portion 5 is formed in a yoke portion 3 connecting adjacent teeth 2 in a circumferential direction. A magnetic substance developed in the notch portion is folded and is formed in a cylindrical shape. A step portion 7 is formed between a slot bottom 31 in the yoke portion and a split face 32 forming the notch portion. An insulator 4 which is integrally molded to cover a peripheral face of the teeth, the slot bottom and a surface of a side portion 71 extending in a radial direction in the step portion is arranged. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a stator for a rotating electrical machine formed by bending an iron core having a notch in a yoke portion into a cylindrical shape.

  As a conventional technique, an insulating member is disposed so as to cover a surface of a salient pole of a connecting iron core formed by bending a magnetic member in which a plurality of salient poles each having a plurality of laminated magnetic thin plates are connected to each other. And a rotor having a coil wound around the salient pole of the iron core via an insulating member, and a rotor disposed radially inward of the armature. Insulating members respectively disposed on the salient poles adjacent to each other abut against each other when the magnetic member is bent so that the respective slot width dimensions formed between the salient poles are made uniform. Yes (see, for example, Patent Document 1).

JP 2002-291190 A (first page, FIG. 1)

  In the case of the conventional technology as described above, although the width dimension of each slot is equally spaced, there is no variation in the acting magnetic force, and the effect of uniformizing the torque is obtained, but the insulating member is separated from the iron core. If resin molding is performed and each slot is inserted from both sides in the axial direction during assembly, the time and cost required for the assembly work increase, and the molding of the insulating member requires high dimensional accuracy, resulting in a low manufacturing cost. There was a problem of swelling.

  In order to solve such a problem, a method in which the insulator is integrally formed by molding from the teeth portion to the bottom of the slot is conceivable. In this case, the position of the end portion on the split surface side at the bottom of the slot of the insulator is a metal required for molding. Because it is regulated by the mold seal part, the circumferential length is insufficient, and when the iron core is bent into an annular shape, the adjacent insulator gap becomes larger than the diameter of the winding, and the winding falls into the insulator gap, There was a risk of impairing insulation by contact with the connecting iron core. Also, in order to ensure insulation under such conditions, the number of windings must be reduced, and there is a problem that the space factor cannot be improved.

  The present invention has been made in view of the actual state of the prior art as described above, is easy to assemble, and there is no fear that the winding falls into the gap between adjacent insulators, and the insulation performance and the space factor are improved at a low cost. It aims at obtaining the stator of the rotary electric machine which can be provided.

The stator of the rotating electrical machine according to the present invention is formed in a cylindrical shape by forming a notch portion in a yoke portion that connects adjacent teeth portions in the circumferential direction, and bending the magnetic material developed in the notch portion. A stator of a rotating electrical machine, wherein a step portion is formed between a slot bottom surface of the yoke portion and a split surface forming the notch, and a peripheral surface of the teeth portion, the slot bottom surface, and the step portion An insulator integrally molded so as to cover the surface of the side surface portion extending in the radial direction, and the stepped surface side of the stepped surface extending in the circumferential direction connected to the divided surface in the stepped portion The predetermined length is exposed from the insulator as a mold seal portion length necessary for the molding .
In the stator of the rotating electrical machine according to the present invention, a notch is formed in a yoke portion that connects adjacent teeth portions in the circumferential direction, and a magnetic body developed in the notch is bent to form a cylindrical shape. A stator of a rotating electric machine, wherein a step is formed between a slot bottom surface of the yoke portion and a split surface forming the notch, and a peripheral surface of the teeth portion, the slot bottom surface, and the An insulator integrally molded so as to cover the surface of the side surface portion extending in the radial direction in the step portion is provided, and the dimension in the circumferential direction of the step surface in the step portion is a mold seal necessary for molding It is more than the value which added the part length and the thickness of the said insulator, It is characterized by the above-mentioned.

In this invention, a step portion is formed between the slot bottom surface of the yoke portion and the dividing surface forming the notch portion, and the peripheral surface of the tooth portion, the slot bottom surface, and the side surface portion extending in the radial direction at the step portion. Insulator molded so as to integrally cover the surface of the step, and a predetermined length on the divided surface side is necessary for the molding, among the step surfaces extending in the circumferential direction connected to the divided surface in the stepped portion As the length of the mold seal portion exposed from the insulator, the circumferential length of the insulator covering the bottom of the slot is increased, and the gap between adjacent insulators can be made smaller than the diameter of the winding. it can. For this reason, there is no possibility that the insulation falls due to the winding falling into the gap between the adjacent insulators. Further, since the number of windings can be increased, the space factor can be improved and the quality can be improved. Furthermore, since the insulator is integrally formed with the iron core by molding, assembly is easy and the processing cost can be reduced. Then, the insulator can be easily molded.
In the present invention, a step portion is formed between the slot bottom surface of the yoke portion and the dividing surface forming the notch portion, and extends in the radial direction of the peripheral surface of the tooth portion, the slot bottom surface, and the step portion. An insulator molded so as to integrally cover the surface of the side surface part is provided, and the circumferential dimension of the step surface of the step part is obtained by adding the mold seal part length necessary for molding and the thickness of the insulator. When the value is equal to or greater than the above value, the circumferential length of the insulator covering the bottom surface of the slot is increased, and the gap between adjacent insulators can be made smaller than the diameter of the winding. For this reason, there is no possibility that the insulation falls due to the winding falling into the gap between the adjacent insulators. Further, since the number of windings can be increased, the space factor can be improved and the quality can be improved. Furthermore, since the insulator is integrally formed with the iron core by molding, assembly is easy and the processing cost can be reduced. And stabilization of the integral molding which concerns on an insulator can be aimed at.

It is sectional drawing which shows the principal part of the stator of the rotary electric machine which concerns on Embodiment 1 of this invention in an unfolded state. It is principal part sectional drawing which shows the state which bent the stator core of FIG. 1 in the cylindrical shape. It is principal part sectional drawing which shows the state which gave the coil | winding to the teeth part of FIG. It is principal part sectional drawing which shows the state which bent the stator core of FIG. 3 in the cylindrical shape. It is a reference figure explaining the stator core structure which assumed the conventional device for comparison.

Embodiment 1 FIG.
1 is a cross-sectional view showing a main part of a stator of a rotary electric machine according to Embodiment 1 of the present invention in an unfolded state, and FIG. 2 is a main part cross-sectional view showing a state in which the stator core of FIG. 3 is a cross-sectional view of a main part showing a state where the teeth of FIG. 1 are wound, and FIG. 4 is a cross-sectional view of the main part showing a state in which the stator core of FIG. 3 is bent into a cylindrical shape. 1, 2, and 4, all the diagrams shown in the enlarged circles A, B, and C drawn at the tip of the arrow are enlarged views. In the figure, the stator core 1 of the rotating electrical machine according to the first embodiment is formed so as to connect a plurality of teeth portions 2 projecting in the central direction and the outer peripheral portions of the adjacent tooth portions 2 in the circumferential direction. The yoke portion 3, the outer peripheral surface of the tooth portion 2, the slot bottom surface 31 that is the inner peripheral surface of the yoke portion 3, and the insulator 4 that is integrally molded so as to straddle the step portion 7 described later. As shown in FIG. 2, a slot S is formed between adjacent tooth portions 2.

  In the yoke part 3 located in the circumferential direction intermediate part between the adjacent teeth parts 2, the notch part 5 formed in the outer peripheral surface direction from the radial center side and the outer peripheral end of the notch part 5 are formed. A thin portion 6 is configured. In addition, at the beginning of the manufacturing process, the notch part 5 has a notch that reaches the outer peripheral surface (not shown), and the stator core 1 is separated in the circumferential direction and deployed. It is formed in the state. A stepped step portion 7 is formed between the slot bottom surface 31 in the yoke portion 3 and the dividing surface 32 forming the notch 5, that is, at the corner where the slot bottom surface 31 and the dividing surface 32 intersect. . As shown in the enlarged circle B of FIG. 2, the stepped portion 7 extends in the radial direction connecting to the side surface 71 connected to the slot bottom surface 31 and the outer diameter side end of the side surface 71 and the dividing surface 32. It consists of an existing stepped surface 72.

  The insulator 4 is molded so as to be integrally covered from the outer peripheral surface of the tooth portion 2 through the slot bottom surface 31 in the yoke portion 3 and across the side surface portion 71 in the stepped portion 7. In the stepped portion 7, a predetermined length (dimension c) on the divided surface 32 side is exposed from the insulator end surface 41 as shown in the enlarged circle A in FIG. 1, and the exposed portion is the insulator. 4 is a mold seal portion 72a necessary for molding. In this example, the tooth portions 2 are provided at equal intervals in the circumferential direction, and the notch portion 5 is provided at the center of the adjacent tooth portions 2. When attention is paid to one tooth portion 2, as shown in FIG. 1, the notch portion 5 and the step portion 7 are formed symmetrically with respect to the center line O in the drawing. The stator core 1 is formed by laminating a predetermined number of magnetic thin plates.

As shown in FIG. 2, when the yoke part 3 is bent at the thin part 6 so as to make the opposed divided surfaces 32 abut each other, the corner part 4 a of the insulator 4 is formed as shown in the enlarged circle B. A small gap of size f is formed so as not to interfere with the opposing corner 4a. The gap dimension f is sufficiently larger than the diameter φ of the winding 8 when the winding 8 such as an enameled wire is applied around the tooth portion 2 as shown in FIG. Is a small one,
0 ≦ f <φ
It is comprised so that it may become a relationship.
Further, when the dimension required for the mold seal portion 72a is c, the thickness of the insulator 4 is d, and the circumferential dimension of the step surface 72 is e, the dimension e of the step surface 72 in the step portion 7 is:
e ≧ c + d
It is comprised so that it may become a relationship.

On the other hand, the broken line shown in the enlarged circle A of FIG. 1 shows the shape and position of the stator core and insulator of the comparative example assuming the conventional apparatus shown in FIG. 5, and 32A shown by the broken line is the yoke part 3A. A dividing surface, similarly 41A, is an insulator end surface. A stator core 1A as a comparative example corresponds to a conventional device in which the step portion 7 of the first embodiment is not provided as shown in the reference diagram of FIG. That is, in FIG. 5, the slot bottom surface 31 </ b> A in the yoke portion 3 </ b> A provided so as to connect the outer peripheral portion of the tooth portion 2 in the circumferential direction is formed so as to continue to the dividing surface 32 </ b> A that forms the notch portion 5. As shown in the enlarged circle D in FIG. 5, the slot bottom surface 31A is mostly covered by the insulator 4A, and a mold seal having a predetermined dimension c _A is provided between the insulator end surface 41A and the vicinity of the upper end of the dividing surface 32A. The part 31Aa is exposed.

Here, as shown in FIG. 5, the dimension from the end surface of the tooth portion 2 of the slot bottom surface 31A to the dividing surface 32A forming the cutout portion 5 is b _A in the comparative example, and the teeth in the insulator 4A covering the slot bottom surface 31A. the dimension from the end face parts 2 to the insulator end surface 41A _{a a,} the thickness of the insulator 4A and _{d a.} Further, as shown in the enlarged circle E in FIG. 5, the dimension of the gap between the opposing insulators 4A when the winding 8 is coiled on each tooth portion 2 of the stator core 1A and then bent into a cylindrical shape. Let f _A be.

Next, the operation of the first embodiment configured as described above will be described. First, as shown in FIG. 1, the dimension from the end surface of the tooth portion 2 of the slot bottom surface 31 to the side surface portion 71 of the stepped portion 7 is b, and the end surface of the insulator 4 from the end surface of the tooth portion 2 that covers the slot bottom surface 31. The dimension up to 41 is a. As a premise, the thickness d of the insulator 4 of the first embodiment is equal to the thickness d _A of the insulator 4 of the comparative example, and similarly, the dimension c of the mold seal portion 72a and the mold seal portion 31Aa the dimensions c _a equal, furthermore, the diameter f and the teeth 2 sizes windings 8 (8a) or the like is also assumed to be equal to each other. That is,
Let d = d _A and c = c _A.

In the first embodiment, a stepped step portion 7 is formed between the slot bottom surface 31 of the yoke portion 3 and the dividing surface 32 forming the notch portion 5, and the dividing surface 32 of the step portion 7 A predetermined length (dimension c or more) on the divided surface 32 side among the connected step surfaces 72 is ensured in an exposed state as a mold seal portion 72a, while the insulator 4 is stepped from the peripheral surface of the tooth portion 2 through the slot bottom surface 31. By providing so as to cover the side surface portion 71 on the circumferential side in the portion 7, as shown in an enlarged circle A in FIG. 1, the dimension a from the end surface of the teeth portion 2 to the insulator end surface 41 in the insulator 4 is For the dimension a _{A in the} comparative example,
a> a _A
And it gets bigger.

Further, since the dimension a in the circumferential direction of the insulator 4 is increased, the dimension f of the gap between the opposite corners 4a of the adjacent insulators 4 when the stator core 1 is bent is the dimension f in the comparative example. _{For A} ,
f <f _A
And it gets smaller. As a result, the winding 8 (8a) falls into the gap between the adjacent insulators 4, and there is no possibility that the stator core 1 and the winding 8 come into contact with each other. Furthermore, the circumferential dimension “a” of the insulator 4 at the slot bottom surface 31 is larger than that in the comparative example, and the gap dimension “f” between the insulators 4 is reduced, so that the enlarged circle C in FIG. Further, it is possible to increase the number of windings 8a indicated by broken lines, and the space factor can be improved.
In addition, since the dimension e of the stepped surface 72 in the stepped portion 7 is configured so as to satisfy the relationship of e ≧ c + d, the mold seal portion 72a is reliably secured, and the insulator 4 can be easily molded.

  As described above, according to the first embodiment, the stepped step portion 7 is formed between the slot bottom surface 31 in the yoke portion 3 and the dividing surface 32 that forms the notch portion 5, and the teeth portion 2 By providing the insulator 4 molded so as to integrally cover the outer peripheral surface, the slot bottom surface 31, and the surface of the side surface portion 71 extending in the radial direction in the stepped portion 7, the insulator 4 covering the slot bottom surface 31 is provided. The circumferential length a can be increased, and the gap f between adjacent insulators can be made smaller than the diameter φ of the winding 8.

  For this reason, there is no risk of impairing the insulating property due to the winding 8 falling into the gap between adjacent insulators, and the quality can be further improved in terms of the insulating property. Moreover, since the number of windings 8 can be increased, the space factor can be improved. Furthermore, since the insulator 4 is integrally formed with the stator core 1, assembly is easy, and processing costs can be reduced. Further, the dimension f between the opposing insulators 4 when the stator core 1 is bent is smaller than the diameter φ of the winding 8, and adjacent insulators 4 do not interfere with each other even after the bending. Due to the structure, the roundness after bending of the stator core 1 can be secured. Further, the dimension e in the circumferential direction of the stepped surface 72 is set to a value equal to or greater than the value obtained by adding the length c of the mold seal portion 72a and the thickness d of the insulator 4, thereby stabilizing the integral molding of the insulator 4. be able to.

  In the description of the above embodiment, the case where the mold seal portion 72a is exposed is illustrated. However, in this case, the exposure is a state where the surface of the iron core is not covered by the insulator 4, For example, even if the surface of the mold seal portion 72a is covered with a cured film of impregnating resin, it is included in the exposure. It goes without saying that various modifications and changes are possible within the scope of the present invention.

  1, 1A stator core, 2 teeth part, 3, 3A yoke part, 31, 31A slot bottom face, 31Aa mold seal part, 32, 32A split surface, 4, 4A insulator, 4a corner part, 41, 41A insulator end face, 5 Notch part, 6 Thin part, 7 Step part, 71 Side part, 72 Step part, 72a Mold seal part, 8, 8a Winding, O Center line, S slot, φ diameter.

Claims (3)

A stator of a rotating electrical machine in which a notch portion is formed in a yoke portion that connects adjacent teeth portions to each other in the circumferential direction, and a magnetic body developed in the notch portion is bent to form a cylindrical shape. Steps are formed between the slot bottom surface of the portion and the dividing surface forming the notch, and the peripheral surface of the tooth portion, the slot bottom surface, and the surface of the side surface portion extending in the radial direction of the step portion And a predetermined length on the divided surface side of the step surface extending in the circumferential direction connected to the divided surface in the stepped portion is a gold necessary for the molding. as a mold seal part length, the stator of the rotary electric machine characterized in that it is exposed from the insulator. Gap size of the corner cross of opposing provided on the teeth adjacent the insulator is claimed in claim 1, characterized in that the smaller dimension than the diameter of the wound winding the teeth Stator of rotating electrical machine. A stator of a rotating electrical machine in which a notch portion is formed in a yoke portion that connects adjacent teeth portions to each other in the circumferential direction, and a magnetic body developed in the notch portion is bent to form a cylindrical shape. Steps are formed between the slot bottom surface of the portion and the dividing surface forming the notch, and the peripheral surface of the tooth portion, the slot bottom surface, and the surface of the side surface portion extending in the radial direction of the step portion And the circumferential dimension of the stepped surface of the stepped portion is not less than the value obtained by adding the mold seal portion length necessary for molding and the thickness of the insulator. the stator of that rotary electric machine to wherein there.

Images