JP2001309619A - Winding method for stator coil in rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a way for easily winding a stator coil in good order to a cylindrical stator core at the inner radius of which a slot is formed. SOLUTION: The stator coil 2 made of an elastic material is formed in advance in a state of being wound to the stator core 1, the formed coil is stretched to an axial direction and elastically deformed in a spiral shape having a diameter smaller than an inside diameter of the stator core 1, and then the elastically deformed coil is inserted into the inner radius of the stator core 1 to be elastically recovered in sequence so that the stator coil 2 can be housed in the slot 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of a method for winding a stator coil wound around a stator (stator) of a rotating electric machine such as a motor or a generator (alternator).

[0002]

2. Description of the Related Art In general, in this type of rotary electric machine, there is a type in which a stator coil is wound in a wave winding shape on an annular stator core having a slot formed in an inner peripheral surface portion, and the stator coil is wound. As a method, for example,
As shown in JP-A-3-69448, a coil is wound in a zigzag shape around winding pieces arranged alternately around an axis, and the bundle of coils is pushed out in the radial direction in a state where the coil is applied to the stator, thereby forming a slot in the stator core. And Japanese Patent Application Laid-Open No. 54-99901,
As disclosed in Japanese Patent Application Laid-Open No. 843, a coil formed in a planar star shape in advance is inserted into a slot of a stator core while being bent and deformed by about 90 degrees.

[0003]

However, in any of the above, the shape of the stator coil is different before and after being accommodated in the slot, so that the shape is required. There is a possibility that insulation may be damaged due to rubbing of the slot and the slot, so that insulation inspection after shaping is necessary, and even if the shaping is performed, all coil ends can not be aligned and the space factor decreases. In addition, there is a problem that as a result of shaping, it takes time to disassemble, and these have problems to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been created with the object of solving these problems, and is an annular ring having a slot formed in an inner peripheral surface portion. When winding the stator coil around the stator core, the stator coil is made of a material having elasticity, and before the stator coil is wound around the stator core, the stator coil is preformed into a shape wound around the stator core,
The molded product is stretched in the axial direction and elastically deformed so as to be a spiral having a diameter smaller than the inner diameter of the stator core, and the elastically deformed product is inserted into the inner peripheral side of the stator core from one end in the axial direction, and from the inserted side. The stator coil is wound around the stator core by successively returning to elasticity and housing the stator coil in the slot. By doing so, the winding work of the stator coil can be easily performed, and shaping is not required, thereby improving the working efficiency. Further, since the stator core is elastically restored to the shape when formed in advance, it is wound in an orderly manner, which can contribute to an improvement in the space factor. Also,
The disassembly of the stator is simplified, which is convenient for recycling.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an annular stator core constituting a generator (in the present embodiment, a three-phase AC generator), and a plurality of stator coils 2 on the inner peripheral surface of the stator core 1 are inserted. A slot 3 is formed. And the stator coil 2 of each phase is
Each of the slots 3 is wound in a wave-like manner in every other slot 3 while being shifted from each other in the circumferential direction. Each slot 3 accommodates a plurality of stator coils 2 of the same phase. It is supposed to be.

[0006] The stator coil 2 is formed using a material having elasticity. In winding the stator coil 2 around the stator core 1, first, before winding the stator coil 2 of each phase on the stator core 1, an ideal wave winding shape wound on the stator core 1 in advance is used. It is molded in detail so that In this case, the coil end portions protruding from both ends in the axial direction of the stator core 1 are also formed into an ideal shape in detail, for example, the coil ends are arranged substantially in a line and a gap through which cooling air passes is secured. I do.

Next, the formed first-phase stator coil 2 is elastically deformed so as to have a spiral shape having a diameter slightly smaller than the inner diameter of the stator core 1 by being pulled in the axial direction. 3 is inserted into the inner peripheral side of the stator core 1 from the side inserted into the groove bottom (outer diameter side).
Then, the stator coil 2 is automatically elastically restored from the side inserted into the inner periphery of the stator core 1 so that the stator coil 2 automatically expands in the outer diameter direction and is accommodated in the slot 3. Is wound around the stator core 1 in an ideal shape. Next, the second-phase stator coil 2 is wound around the stator core 1 in the same manner as in the first-phase, while being shifted from the first-phase stator coil 2 by two slots in the circumferential direction, and furthermore, And the third phase stator coil 2 is wound around the stator core 1.
The work of winding the stator coil 2 around the end is completed. When the formed stator coil 2 is elastically deformed, the entire stator coil 2 may be pulled in the axial direction to form a spiral shape. However, the stator coil 2 is elastically deformed by being sequentially pulled from the side inserted into the inner peripheral side of the stator core 1. You may do it.

In the configuration described above, the stator coil 2 is formed using a material having elasticity. When the stator coil 2 is wound around the stator core 1, as described above, the stator core 2 The stator coil 2 is formed in advance so as to have an ideal shape wound on the stator core 1, and the formed shape is pulled in the axial direction to be elastically deformed into a spiral having a smaller diameter than the inner diameter of the stator core 1. The deformed material is inserted into the inner peripheral side of the stator core 1 and sequentially elastically restored, so that the stator coil 2
Is automatically stored in the slot 3 and wound around the stator core 1 in an ideal shape.

As a result, the work of winding the stator coil 2 on the stator core 1 can be easily performed, and the stator coil is housed in the slot like a conventional winding piece or one that is bent and deformed. Eliminating the need for shaping later increases work efficiency. In addition, there is no risk of insulation being damaged at the time of shaping, so that inspection of insulation after shaping is not required. Further, since the stator coil 2 wound around the stator core 1 is elastically restored to an ideal shape when preliminarily formed, the coil end portion is also wound in a state in which the coil end portion is neatly aligned. , The space factor can be improved. In addition, disassembly is simplified, which is convenient for recycling and the like.

[Brief description of the drawings]

FIG. 1 is a partially cutaway view showing a winding state of a stator coil.

FIG. 2 is an explanatory view showing a process of winding a stator coil around a stator core.

[Explanation of symbols]

 1 stator core 2 stator coil 3 slot

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Claims (1)

[Claims] When winding a stator coil around an annular stator core having a slot formed in an inner peripheral surface thereof,
The stator coil is made of a material having elasticity, and before the stator coil is wound around the stator core, the stator coil is pre-formed into a shape wound around the stator core, and the formed stator coil is pulled in the axial direction to form the stator coil. It is elastically deformed so as to form a spiral with a smaller diameter than the inner diameter, the elastically deformed one is inserted into the inner peripheral side of the stator core from one axial end side, and elastically restored sequentially from the inserted side to put the stator coil in the slot. A method of winding a stator coil in a rotating electric machine in which a stator coil is wound around a stator core by being housed.