JP2606480Y2 - Rotating electric machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a rotating electric machine, and more particularly to insulation of a coil end of a stator coil.

[0002]

2. Description of the Related Art FIG. 4 shows a stator core 1 of a rotating electric machine, which has a structure in which silicon steel sheets are laminated. A slot 2 for fitting is punched out. Cooling ducts 3 are provided at several locations in the axial direction of the stator core 1. In this structure, since the opening end face of the slot 2 has a corner 2a as shown in an enlarged manner in FIG. 5, when the stator coil is fitted into the slot 2,
Insulation is rubbed in the portion a, and the coil is damaged, and the coil is damaged due to the force applied during the coil connection, resulting in a defective product. It is conceivable to work by changing the dimensions of the silicon steel sheet one by one so that the opening end face of the slot 2 does not become the corner 2a. However, changing the size of the slot 2 one by one requires workability and cost. I want to avoid from the aspect of. Conventionally, in order to reduce even a little damage caused by the corner 2a of the opening end face of the slot 2, the fixing is strengthened by attaching a reinforcing inclusion 4 or a coil presser 5 shown in FIG.

[0003] In the above description of the related art, the problem caused by the corner 2a of the opening end of the slot 2 when the stator coil is fitted into the stator core 1 has been described. It is also known that the highest stress is applied to the portion A of the stator coil 6 at the portion A shown in FIG. That is, FIG.
(C) The insulation thickness T between the coil 6 and the iron core 1 is uniform both in the slot in the iron core 1 and at the end of the iron core 1, and the insulator 7 is expensive, requires a large number of winding steps, and is made as thin as possible. . For this reason, while the coil 6 is supported by the slot 2 in the iron core 1, stress concentrates on the portion A at the coil end at the end of the iron core 1, and the coil retainer 5 and the reinforcing inclusion 4 are provided. As a result,
Due to the bondage, labor is required, and skilled work and labor costs are high.

The present invention has been made in view of the above-described problems, and is intended to reduce the concentration of stress without a coil presser or a reinforcing inclusion.
It is another object of the present invention to provide a stator for a rotating electrical machine in which a corner of an opening end of a slot is eliminated to prevent damage to a coil.

[0005]

According to the present invention, there is provided a rotating electric machine having a stator in which a stator coil is integrated with a slot of the stator core. First cooling from the axial end of the slot
1 stack worth of slots to the duct is formed to be larger than the slot in the axially central portion, first from the axial end
One slot portion of the stack content to the cooling duct, the axis direction a slot in which the stator coil is inserted
It has the same width and the same depth as the central slot,
Slot formed to be continuous with the slot at the center in the direction
The stator is formed by fitting a block-shaped molded body made of an insulator having a slot.

(2) In the above (1), the molded body
The open end of the slot having characterized the kite is curved.

[0007]

First, a large slot near the end of the stator core in the axial direction is made large, and a part of the slot is increased by the increased thickness.
By providing the insulating material consists of block-shaped molded article from the <br/> insulating layer is increased thereby preventing insulation failure due to damage of the coils. Secondly, since there is an insulating molded article having a curved portion in the axially formed end slot, it is possible to prevent the stress from being excessively concentrated at the corner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS. FIGS. 1 to 3 show an embodiment of the present invention, in which a slot 2 of a stator core 1 in which a stator coil 6 is fitted has a distance C from an axial end face thereof, for example, a cooling duct.
Is made larger by the length of one stack . That is, a silicon steel plate laminated is punched so as to increase the groove width and depth of the slot 2 by a predetermined length at the end of the iron core as shown in FIG. When the silicon steel sheets punched in this manner are laminated, the slot 2 becomes larger by the width T in FIG. 2, and the insulator 7 can be arranged at the interval T.

As a result, since the punching of the stator core 1 is automated, punching only the portion of the distance C from the end face of the core so as to increase the interval T requires binding the conventional coil retainer or reinforcing inclusion. become cheaper than, hands insulation to the interval T
By providing the object 7, sufficient insulation can be provided up to the coil end , and it is possible to cope with stress concentration at the portion A (see FIG. 6) .

In this embodiment, as shown in FIG. 3, for example, a slot 2 having a wide groove width and a depth corresponding to one stack from the end face of the stator core 1 to the cooling duct 3 is formed with an insulating material 7. The product 8 is fitted. This molded product 8
Is the same width and width as the axial center slot of stator core 1.
And the same depth and continuous with the slot in the axial center
It includes a formed slot 8a to open end of the slot 8a is in a smooth and Nakuwan song that angulate. Note that slot 8a is equal to the coil width.
May be slightly smaller. That is, the slot 8 of the molded product 8
The width and depth of “a” depend on the elasticity of the insulating material used.
May be slightly smaller.

Since the end surface of the molded product 8 is curved,
The stator coil is easy to insert, the coil insulation is not damaged, and the coil connection is not damaged even if a force is applied. Further, since the molded article 8 is an insulator, a squeeze margin can be provided between the molded article 8 and the coil coated with the insulation, and the support can be more firmly supported than the conventional reinforcing inclusion. In addition, the coil retainer and the reinforcing inclusion can be omitted, and this omission does not cause damage to the insulating layer, and the life of the device is not changed.

[0012]

According to the present invention, as described in the above embodiments , the slot insulator is located at the end of the iron core.
The coil was integrated by fitting a block-shaped molded body
No damage, such as damaging the coil, is eliminated. Only
Stress without the need for coil holders or reinforcing inclusions
Concentration can be reduced. Also fit a block-shaped molded body
It is easy to install itself, and
Stable insulation strength without falling off when mounting the file
Can be secured and maintained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment.

FIG. 2 is a side view of the part of FIG. 1;

FIG. 3 is a configuration diagram of a molded body according to one embodiment .

FIG. 4 is a configuration diagram of a stator core.

FIG. 5 is an enlarged view of an end face of the slot opening of FIG. 4;

FIG. 6 is an explanatory diagram of conventional stator coil insulation and fixing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stator core 2 Slot 6 Stator coil 7 Insulator (molded body) 8 Concrete block-shaped molded body 8a Slot

Continuation of the front page (56) References JP-A-1-308138 (JP, A) JP-A-63-206133 (JP, A) JP-A-3-50945 (JP, U) JP-A 64-2547 (JP , U) Japanese Utility Model Showa 62-185462 (JP, U) Japanese Utility Model Showa 59-63649 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A rotating electric machine having a stator in which a stator coil is integrated with a slot of a stator core, wherein one of the slots provided in the stator core extends from an axial end to a first cooling duct. the stack portion of the slot is formed to be larger than the slot in the axially central portion, 1 stack worth to first cooling duct from the axial end
Of the slot portion, the same width and as the axial central portion of the slot a slot in which the stator coil is inserted
It has the same depth and is continuous with the slot at the axial center.
A rotating electric machine characterized in that a stator is formed by fitting a block-shaped molded body made of an insulator having a slot formed as described above . 2. The rotating electric machine according to claim 1, wherein an opening end of a slot of the molded body is curved.