JPH062955U - Three-phase induction motor stator - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the reliability of insulation by eliminating the protrusion of the connecting member inserted in the slot. A three-phase stator in which different phases of coil ends of stator windings 32, 33, 34 projecting outward from both end surfaces of a stator core 31 are insulated by insulating paper A, The connecting member 30 that connects the insulating papers A at both coil ends is inserted into the slot into which the inner coil of the coils sandwiching the insulating paper is inserted, and this coil prevents the connecting members from popping out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a three-phase induction motor stator, and more particularly to a three-phase induction motor stator having an improved insertion position of an insulator that insulates coil ends from each other.

[0002]

[Prior art]

 In the stator of a three-phase induction motor, insulating paper is sandwiched between the phases of both coil ends to insulate the phases. Fig. 4 is an expanded view of this type of interphase insulator, where symbol A indicates an insulating paper, and a pair of two insulating papers A and A that insulate the phases of both coil ends of the stator, respectively. Are connected by a plurality of linear connecting members 30 to form an insulator. The positions of the insulating paper A and the coils of the respective phases are schematically shown in FIG. 3 for a stator of a two-pole three-phase induction motor, for example. Here, on the inner peripheral surface of the stator core 31, a large number of slots extending in the axial direction are formed in the peripheral direction of the core, and the numbers 1 to 24 assigned to each slot are for identifying the slot. It shows the slot number. The coils are a U-phase coil 32, a V-phase coil 33, and a W-phase coil 34 in order from the outside, and an insulating paper A is interposed at the position shown by the broken line in order to insulate the phases of these coil ends.

Conventionally, as shown in FIG. 5, the insulating coupling member 30 is inserted into an empty slot in which the coil winding is not inserted. In this case, the position of the slot into which the connecting member 31 is inserted is determined so that the tensile force is distributed in a balanced manner on the insulating papers A, A at both coil ends.

[0004]

[Problems to be solved by the device]

 However, recent material-saving, high-efficiency induction motors are designed to minimize the size of the stator coil end. Therefore, when the coil end is pressed against the iron core by a jig in the stator manufacturing process, the connecting member 30 that has been in the slot until then tends to pop out (see FIG. 5). The work of re-inserting the connecting member 30 protruding from such a slot into the slot is complicated and time-consuming, and if the protruding connecting member 30 is caught by another jig and cut, the insulator A will come off and insulation failure will occur. There was a problem. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a stator for a three-phase induction motor, which solves the problems of the above-mentioned conventional technique and eliminates the protrusion of the connecting member inserted in the slot to improve the insulation reliability. .

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a three-phase stator in which different phases of the coil ends of the stator windings protruding outward from both end surfaces of the stator core are insulated by insulating paper. The connecting member connecting the insulating papers at both coil ends is inserted into the slot into which the inner coil is inserted among the coils sandwiching the insulating paper.

[0006]

[Action]

 According to the present invention, in the slot into which the connecting member for connecting the insulating paper is inserted, the connecting member is always accommodated inside the inner coil, so that the inner coil prevents the connecting member from popping out.

[0007]

【Example】

 Hereinafter, an embodiment of a stator of a three-phase induction motor according to the present invention will be described with reference to the accompanying drawings.

The same components as those of the above-described conventional example will be described with the same reference numerals. FIG. 2 is a developed view of the insulator, and the insulating paper A is cut into a strip shape suitable for insulating the coil ends of the respective phases. Four connecting members 30 are used and are bonded to the insulating paper A at positions corresponding to the positions of the slots into which these connecting members are inserted. Two such insulators are used to insulate each phase.

FIG. 1 is a diagram schematically showing the positional relationship between the coils of each phase and the insulator when the present invention is applied to a three-phase stator of a two-pole three-phase induction motor.

In this embodiment, insulating paper A ₁ for insulating between the coil ends of the U-phase coil 32 and the V-phase coil 33, and insulating paper A for insulating between the coil ends of the V-phase coil 33 and the W-phase coil 34. For each of the _two , the connecting member 30 is inserted in the slot into which the inner coil is inserted.

First, the outermost winding of the U-phase coil 32 is inserted into slots 1, 2, slots 11, 12, slots 13, 14 and slots 23, 24 (in the figure, The coil winding to be inserted is indicated by a circle.) On one end surface of the stator core 31, as shown in the drawing, the coil ends of the U-phase coil 32 are formed so as to connect the slots 1 and 12 and the slots 13 and 24 in an arc. The windings of the V-phase coil 33, which is the coil inside the U-phase coil 32, are to be inserted into the slots 21, 22, slots 7, 8, slots 9, 10 and slots 19, 20, respectively. The coil ends of the V-phase coil 33 are formed between the slots 21 and 8 and between the slots 9 and 20. The connecting member 30 (represented by symbol X in the figure) of the insulating paper A ₁ that insulates between the coil ends of the U-phase coil 32 and the V-phase coil 33 is the V-phase coil 3 after the U-phase coil 32 is mounted. 3 are inserted in advance in slots 21 and 22, slots 9 and 10, slots 19 and 20, and slots 7 and 8. Therefore, by inserting the V-phase coil 33 into these slots, the connecting member 30 is housed so as to be pushed into the inside of the slot. Therefore, the connecting member 30 is prevented from being caught by the jig or the like and popping out.

Similarly, with respect to the insulating paper A ₂ between the V-phase coil 33 and the W-phase coil 34, slots 5, 6 into which the inner W-phase coil 34 is inserted, slots 15, 16 and slot 17 are arranged. , 18, slots 3 and 4, the connecting member 30 is inserted in advance, and then the winding of the W-phase coil is inserted to form the coil.

[0013]

[Effect of device]

 As is clear from the above description, according to the present invention, the connecting member that connects the insulating papers of both coil ends is inserted in the slot into which the inner coil of the coils sandwiching the insulating paper is inserted. The connecting member is always accommodated in the inner side of the coil winding in the slot. Therefore, the connecting member does not jump out of the slot, and unnecessary work such as re-inserting the connecting member in the slot during manufacturing is eliminated, and the workability of assembly is improved. Further, since the connecting member can be completely prevented from popping out, it is possible to prevent an accident such as the insulating paper coming off due to the cutting of the connecting member to cause insulation failure, and it is possible to improve the reliability of insulation.

[Brief description of drawings]

FIG. 1 is a schematic view showing an arrangement of an insulator and a coil in an embodiment of a stator of a three-phase induction motor according to the present invention.

FIG. 2 is a development view of an insulator used in this example.

FIG. 3 is a schematic diagram showing an arrangement of insulators and coils in a conventional stator.

FIG. 4 is a development view of a conventional insulator.

FIG. 5 is a perspective view showing a state where the connecting member of the coil and the insulator is protruded when the connecting member of the coil and the insulator is attached to the slot in the conventional stator.

[Explanation of symbols]

 1 to 24 slot 30 connecting member 31 stator core 32 U-phase coil 33 V-phase coil 34 W-phase coil A insulating paper

Claims (1)

[Scope of utility model registration request] 1. A stator of a three-phase induction motor in which different phases of coil ends of a stator winding protruding outwardly from both end faces of a stator core are insulated by insulating paper. A connecting member that connects the insulating paper,
A stator for a three-phase induction motor, characterized in that it is inserted into a slot into which an inner coil of the coils sandwiching the insulating paper is inserted.