JP2000156951A - Electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rotating machine provided with an insulator on which coils can be positively wound regularly. SOLUTION: This electric rotating machine, a cylindrical part 5A comprises a flange part 6A and a flange part 7A which are formed at both ends of the cylindrical part 5A are composed, and an insulator 4A in which coils 8 wound on the cylindrical part 5A is inserted into and placed on the tooth part of a stator core. The outer circumferential face of the cylindrical part 5A is formed into a taper shape in which the outside diameter on the winding start side of the coils 8 is small. Thereby, when the coils 8 are wound on the insulator 4A, gaps (g) are not generated between the coils 8, and the coils 8 can be regularly wound positively and at high density.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine in which an insulator such as a bobbin around which a coil is wound is inserted into the teeth of a stator core.

[0002]

2. Description of the Related Art A conventional rotary electric machine is as shown in FIGS. In both figures, reference numeral 1 denotes a stator core, which comprises a ring-shaped yoke portion 2 and a tooth portion 3 which is closely fixed to the yoke portion 2. Reference numeral 4 denotes an insulator inserted into the tooth portion 3, which is, for example, a bobbin. The bobbin 4 includes a tubular portion 5 and flange portions 6 and 7 formed at both axial ends of the tubular portion 5. Reference numeral 8 denotes a coil wound around the outer peripheral surface of the cylindrical portion 5 of the bobbin 4. The winding around the bobbin 4 is performed before the bobbin 4 is inserted into the tooth portion 3 of the stator core 1. 9 is a rotor.

[0003]

However, in the prior art, the cylindrical portion of the bobbin 4 has a cylindrical shape having the same outer diameter at any position, and thus has the following problems. (1) When the coil 8a of the first layer, which is the lowermost layer, is wound around the bobbin 4, even if tension is applied to the coil 8a to be wound, the outer circumferential surface is pressed against the coil 8a that has already been wound so that the coil 8a is brought into close contact therewith. Since no horizontal force is generated, a gap g is easily generated between the coils 8a of the first layer, so that it is not possible to perform reliable winding. For this reason, the coil of the first layer is disturbed and wound, and the high-density aligned winding cannot be performed even after the coil 8b of the second layer, resulting in poor space efficiency. Therefore, the performance of the rotating electric machine could not be sufficiently exhibited. (2) Also, the coils will be forced into each other,
There is a possibility that the coil may be damaged and insulation failure may occur.
In FIG. 3, in order to compare the winding states,
The coil group on the left side of the bobbin 4 shows a state in which the windings are neatly wound, and the coil group on the right side shows a state in which a gap is formed between the coils and the windings are disordered. The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a rotating electrical machine having an insulator that can reliably align and wind a coil.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an insulator comprising a cylindrical portion and side walls formed at both ends of the cylindrical portion, wherein a coil is wound around the cylindrical portion. In the rotating electric machine, the outer peripheral surface of the cylindrical portion is tapered so that the outer diameter at the winding start side of the coil is small. By the above means, when winding the coil around the insulator, no gap is generated between the coils, and the coil is reliably and densely aligned and wound.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Since the entire configuration of the rotating electric machine is the same as that of the conventional example shown in FIG. 2, illustration and description are omitted. The figures are exaggerated for clarity. In FIG. 1, the same reference numerals as those in FIGS. 2 and 3 indicate the same or corresponding parts. The overall configuration of the bobbin (insulator) 4A is substantially the same as that of the conventional example, but in the present invention, the cylindrical portion 5A is formed.
A is the outer peripheral surface of the coil 8 on the winding start side (collar portion 7A side)
Are formed in a tapered shape having a small outer diameter. In FIG. 1, the winding start side of the coil 8 of the bobbin 4A is the stator core 1
Is set on the inner peripheral side, but may be set on the outer peripheral side, that is, on the side of the collar portion 6A. In such a bobbin configuration, when winding the coil 8 around the bobbin 4A, the bobbin 4
When a tension is applied to the coil of the first layer wound around the cylindrical portion 5A of A, a lateral force acts to shift the coil to the winding start side having a small diameter. No gap is formed between the coils. Therefore, between the first layer coils 8a, valleys formed between the arc portions of the coils are reliably provided at a constant pitch, and the second layer coils 8b
Is wound so as to ride on the valley formed between the coils 8a of the first layer, and the coil 8 is properly aligned and wound. The coils of the third and subsequent layers are wound in a similar manner. Therefore, the coil 8 can be reliably aligned and wound on the bobbin 4A, and a high-density winding can be performed in a certain space to improve space efficiency and improve the performance of the rotating electric machine. In addition, since the coil 8 can be securely wound around the outer periphery of the cylindrical portion of the bobbin 4A, the coils do not forcibly press each other, and insulation failure can be prevented. In the present invention, the insulator is not limited to the bobbin, but may be applied to an insulator that covers the teeth of the stator core from both sides in the axial direction to insulate the teeth.

[0006]

As described above, the present invention provides a bobbin 4
Since the outer peripheral surface of the cylindrical portion A is formed in a tapered shape with a small outer diameter on the winding start side of the coil 8, the following effects are obtained. (1) Since the coil 8 can be securely wound around the bobbin 4A, winding can be performed at a high density within a certain space, and the performance of the rotating electric machine can be improved. (2) Since the coils 8 can be reliably aligned and wound, the coils will not be pressed against each other and insulation failure can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a state in which a coil is wound around a bobbin according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a rotary electric machine showing a conventional example.

FIG. 3 is a sectional view of a main part showing a state in which a coil is wound around a bobbin in a conventional example.
The coil group on the left side of the bobbin 4 shows a state in which the windings are neatly wound, and the coil group on the right side shows a state in which a gap is formed between the coils and the windings are disordered.

[Description of Signs] 1 Stator core 2 Yoke part 3 Teeth part 4, 4A bobbin 5, 5A cylindrical part 6, 6A collar part, 7, 7A collar part, 8 coil, 8a First layer coil, 8b 2nd layer coil, 9 rotors, g gap

Claims (1)

[Claims] 1. A rotary member comprising a cylindrical portion and flange portions formed at both ends of the cylindrical portion, and an insulator having a coil wound around the cylindrical portion is inserted into a tooth portion of a stator core. In the electric machine, the outer peripheral surface of the tubular portion is tapered so that the outer diameter on the winding start side of the coil is small.