JPH0574154U - Rotating electric machine - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the loss of the stator core and increase the slot volume. [Structure] A notch portion 3 is formed in the outer diameter portion of a stator core 1 in the stacking direction, and a U-shaped spring member 4 having a protrusion 6 on a side piece 5 is cut from the outside when the stator core 1 is stacked. The silicon steel plates 2 pressed and punched out were fixed to each other by inserting into the notches 3, and then an insulating layer including the spring member 4 was formed by baking coating of epoxy resin, and then the protrusion 6 of the spring member 4 was formed. The winding 7 is provided as a guide for the coil crossover.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary electric machine, and more particularly to improvements for reducing the loss of the stator core and increasing the slot volume, and is useful when applied to, for example, an induction rotary electric machine or a synchronous rotary electric machine including a brushless rotary electric machine.

[0002]

[Prior Art]

 The following (1) to (3) are known as conventional methods for manufacturing a stator core. (1) Laminate stamped silicon steel sheets, and fix the silicon steel sheets by welding the outer diameter surface of this laminate (laminated iron core) at multiple circumferential positions along the lamination direction. Method. (2) A method of fixing silicon steel sheets by punching holes through the side surface near the outer diameter when punching out the silicon steel sheets and then caulking the entire body by inserting pins into the holes after lamination. .. (3) A method of fixing the silicon steel sheets by forming a projection partly at the time of pressing the silicon steel sheet, stacking the projection part together, and then deforming the projection part by press caulking (for example, , V caulking method, etc.).

Further, the following (a) and (b) are known as methods for performing insulation and winding treatment on the stator core formed by stacking and fixing as described above. (A) A method in which a nylon resin molded by injection molding as a slot insulator (referred to as an insulator) is fitted into the inner surface of the slot of the stator core and its peripheral portion, and then winding is performed. In this case, many insulators have a projection on the end face thereof, which serves as a guide for preventing the coil crossover from falling into the slot during the winding process. (B) A method in which an insulating layer is formed on the surface of the stator core by a baking coating method of epoxy resin and winding is performed. In this case, in order to guide the coil crossover wire, a hole is preliminarily formed in the stator core, a pin-shaped member is erected in the hole for the guide, and then an insulating layer is baked and coated. ..

[0004]

[Problems to be solved by the device]

 The above conventional techniques have the following drawbacks (i) to (iv). (I) When fixing the laminated silicon steel plates by welding in (1) above or by V crimping in (3) above, the alternating magnetic flux cannot be obtained because the silicon steel plates cannot conduct insulation at the fixing part. The eddy current loss that occurs when the slab passes is increased. (Ii) When fixing the laminated silicon steel plates by crimping the pins through the holes in (2) above, using conductive pins such as iron or aluminum will prevent the insulation. The eddy current loss increases as in the above item (i). In addition to this, since the holes are made, the cross-sectional area of the magnetic path at that part becomes narrower, so that the magnetic flux density partially increases, thus increasing the magnetomotive force loss and further partially The loss will increase. (iii) When the insulation treatment is performed with the insulator of (a) above, it is necessary to use a relatively thick-walled insulator because it is necessary to increase the mechanical strength of the nylon resin and improve the injection moldability. This leads to a reduction in slot volume. Further, since the space of the winding is reduced due to the reduction of the slot volume, the heat capacity of the rotating electric machine is reduced. (iv) When the insulation treatment is performed by baking coating of the epoxy resin described in (b) above, it is necessary to erect the pin-shaped member as a guide for the coil crossover wire, which results in extra cost for the pin-shaped member. , Normally, a circular hole is made to stand up this pin-shaped member, so that the magnetic path cross-sectional area of that part is narrowed as in the case of (ii) above, so the magnetic flux density is partially increased. , The magnetomotive force loss increases, and further the iron loss partially increases.

An object of the present invention is to provide a rotating electric machine that solves the above-mentioned drawbacks of the conventional technology.

[0006]

[Means for Solving the Problems]

 The structure of the rotating electric machine according to the invention of claim 1 has a notch portion formed in the outer diameter portion of the steel plate laminate of the stator along the laminating direction, and is inserted into the notch portion and is provided with two facing portions. It is characterized in that the side piece has a U-shaped spring member that elastically holds the steel plate laminate from both sides in the laminating direction.

In this case, as in the second aspect of the invention, it is desirable that the steel plate laminate together with the spring member be coated with an epoxy resin. Further, it is preferable that the spring member has a protrusion protruding from the side piece, and the coil connecting wire of the stator winding is guided to the protrusion.

[0008]

[Action]

 In the structure of the invention of claim 1, the side piece of the spring member clamps the steel plate laminate by elastic force to fix it. In this case, eddy current loss does not increase, because fixing can be performed without breaking the insulation as compared with fixing by welding or V-staking. Also, the spring member can be thin, and the notch can be as shallow as it is enough to insert a U-shaped spring member.Therefore, when making a through hole for inserting the caulking pin or when using a guide pin. The cross-sectional area of the magnetic path is not narrowed and the increase in magnetic flux density can be suppressed as compared with the case where a hole is formed to erect the member. Therefore, the magnetomotive force loss is small and the increase in partial iron loss can be suppressed.

According to the second aspect of the invention, the insulator is unnecessary. According to the epoxy resin coating, the insulating layer can be formed extremely thin as compared with the insulator, and the slot volume is hardly reduced. Therefore, the winding space can be widened and the heat capacity does not decrease.

According to the third aspect of the invention, the projection of the side piece of the spring member serves as a guide to prevent the coil crossover from falling into the slot during the winding process. In this case, it is possible to use a guide having a high mechanical strength even though it is thinner than the protrusion formed on the insulator. Further, since the spring member has the guide, it is easy to secure the insulation distance between the coil and the frame.

[0011]

【Example】

 Hereinafter, the rotating electric machine of the present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a view of the stator core 1 as viewed from the stacking direction (front side), and a plurality of shallow notches 3 are formed in the outer diameter portion of the silicon steel plate 2 of each layer at the time of punching. The press-cut silicon steel plates 2 are laminated in accordance with the cutout portions 3. FIG. 2 shows a spring member 4, in which a thin plate-shaped spring material is formed in a U shape in which the distance between the tips is narrower than the laminated thickness, and the tips of both side pieces 5 are bent outward to form a protrusion 6. There is.

Such a spring member 4 was inserted into the notch 3 of the steel plate laminate from the outside when the press-cut silicon steel plates 2 were laminated, and fixed by the elastic force of the side pieces 5 from both sides in the lamination direction. See FIG.

After that, an insulating layer (not shown) including the spring member 4 was formed by a baking coating method of epoxy resin.

Next, the protrusion 6 of the side piece 5 of the spring member 4 is used as a guide for the coil crossover wire in the winding process, and the teeth are wound around the teeth of the stator core 1 as shown in FIGS. 7 was applied. However, in FIG. 4, only one phase of the coil connecting wire 8 is shown as a representative. In FIG. 4, 9 is a slot.

In the above embodiment, the spring member 4 was inserted into the notch 3 of the stator core 1 only by its elastic force. However, when the spring member 4 moves or falls off during the insulation treatment, When inserting the spring member 4, the spring member 4 and the stator core 1 are adhered to each other with an adhesive (not shown).

[0016]

[Effect of the device]

 According to the present invention, there are the following effects (1) to (3). (1) According to the first aspect of the present invention, the side pieces of the spring member fix the steel plate laminated body by elastically sandwiching it. Therefore, compared with welding or fixing by V-caulking, since the fixing can be performed without breaking the insulation, the eddy current loss does not increase. Also, the spring member may be thin, and the notch may be as shallow as it is enough to insert the U-shaped spring member.Therefore, when making a through hole for inserting the caulking pin or for guiding. The cross-sectional area of the magnetic path is not narrowed and the increase in magnetic flux density can be suppressed as compared with the case where a hole is formed to erect the pin-shaped member. Therefore, the magnetomotive force loss is small, and the increase in partial iron loss can be suppressed. (2) In the invention of claim 2, since the insulating layer is formed by the epoxy resin coating, it is extremely thin as compared with the insulator, and the slot volume is hardly reduced. Therefore, the winding space can be widened and the heat capacity does not decrease. (3) In the invention of claim 3, the projection of the side piece of the spring member serves as a guide to prevent the coil crossover from falling into the slot during the winding process. In this case, it is possible to use a guide having a high mechanical strength even if it is thinner than the protrusion formed on the insulator. Further, since the spring member has the guide, it is easy to secure the insulation distance between the coil and the frame.

[Brief description of drawings]

FIG. 1 is a front view showing a stator core in a stacking direction.

FIG. 2 is a view showing a spring member.

FIG. 3 is a side view of the stator core after the winding process.

FIG. 4 is a front view of a stator core after a winding process.

[Explanation of symbols]

 1 Stator Iron Core 2 Pressed Silicon Steel Plate 3 Notch 4 Spring Member 5 Side Piece 6 Projection 7 Winding 8 Coil Crossover 9 Slot

Claims (3)

[Scope of utility model registration request] 1. A stator steel plate laminate having a notched portion formed in the outer diameter portion along the laminating direction, the two side pieces facing each other forming a steel plate laminate. A rotating electric machine comprising a U-shaped spring member elastically sandwiched from both sides in the stacking direction. 2. The rotary electric machine according to claim 1, wherein the steel plate laminate is coated with an epoxy resin together with the spring-like member inserted in the cutout portion. 3. The U-shaped spring member has a protrusion protruding from the side piece, and the coil connecting wire of the stator winding is guided by the protrusion. Rotating electric machine.