JP6776834B2 - How to heat the coil heating device - Google Patents

Description

The present invention relates to a stator core and a coil heating device that heats a coil wound around the stator core.

A coil heating device that heats the stator core and the coil by passing an electric current through the coil exteriored by the teeth portion of the stator core is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-296151

Here, it is assumed that the stator core has an annular yoke portion as a base portion and a plurality of teeth portions formed along the circumferential direction of the yoke portion and extending inward. A slot portion is formed between the tooth portions adjacent to the stator core. The coil heating device heats the stator core and the coil by passing an electric current through the coil inserted into the slot portion and wound around the stator core.
In this case, an opening of the slot portion is formed between the tips of the adjacent teeth portions. Therefore, when a current is passed through the coil, the magnetic flux easily penetrates the coil in the vicinity of this opening. As a result, the temperature tends to rise particularly in the vicinity of the opening of the slot portion, and the heating temperature of the coil may become non-uniform.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a coil heating device capable of uniformly heating a coil of a stator core.

One aspect of the present invention for achieving the above object is
A slot formed between adjacent tooth portions of a stator core having an annular yoke portion serving as a base and a plurality of teeth portions formed along the circumferential direction of the yoke portion and extending inward. A coil heating device that heats the stator core and the coil by passing an electric current through a coil that is inserted into the portion and wound around the stator core.
The coil heating device is characterized in that a magnetic material is provided in the opening of the slot portion formed between the tips of the adjacent teeth portions.

According to the present invention, it is possible to provide a coil heating device capable of uniformly heating the coil of the stator core.

It is a partial cross-sectional view which expanded a part of the stator core which is one Embodiment of this invention. It is sectional drawing which shows the one slot part in FIG. 1 enlarged. It is a block diagram which shows the schematic system configuration of the coil heating apparatus which concerns on one Embodiment of this invention. It is the figure which provided the magnetic material so that the opening of a slot part is closed from the outside. (A) It is a figure which shows the temperature change of the stator core when the coil is heated by the conventional coil heating apparatus. (B) It is a figure which shows the temperature change of the stator core when the coil of the stator core is heated by the coil heating device which has the magnetic material which concerns on one Embodiment of this invention. It is a figure provided so that a magnetic material fills an opening of a slot part. It is a figure which shows the magnetic flux in the vicinity of the opening of a slot portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The coil heating device according to an embodiment of the present invention heats a coil and a stator core wound around a stator core of an automobile generator or the like. For example, in the manufacturing process of a stator core of an automobile generator, after winding a coil around the stator core, the entire coil is impregnated with varnish, and in this state, the coil is heated using a coil heating device to obtain the impregnated varnish. It can be efficiently cured and dried.

FIG. 1 is an enlarged partial cross-sectional view of a part of the stator core according to the embodiment of the present invention. In FIG. 1, the circumferential direction of the stator core 10 is indicated by an arrow C, and the radial direction is indicated by an arrow R. The axial direction of the stator core 10 is the direction perpendicular to the paper surface of FIG.

A rotor (not shown) is rotatably provided inside the stator core 10 around which the coil 11 is wound through a gap to form a rotary electric machine. The stator core 10 is formed by laminating a large number of annular magnetic plates and integrally connecting them.

The stator core 10 includes an annular yoke portion 12 as a base portion, and a plurality of tooth portions 13 formed along the circumferential direction (C direction) of the yoke portion 12 and extending inward (R direction). Have. A slot portion 14 is formed between the adjacent teeth portions 13. The slot portion 14 opens inward in the radial direction and extends in the axial direction of the stator core 10 and opens at both ends in the axial direction.

FIG. 2 is an enlarged cross-sectional view showing one slot portion in FIG. The slot portion 14 has a substantially rectangular cross section having a constant width w in the direction orthogonal to the radial direction. The slot portion 14 is defined by a tooth side surface 15 of two adjacent tooth portions 13 facing each other and a yoke side surface 16 facing the slot portion 14.

Further, in the opening 17 inward in the radial direction of the slot portion 14, a protruding portion 18 is formed so as to project from the tips of two adjacent tooth portions 13 so as to face each other in the circumferential direction. The protruding portion 18 forms the opening 17 narrower than the width w of the slot portion 14, so that the coil 11 inserted and arranged in the slot portion 14 does not come out of the slot portion 14, as will be described later. There is.

In the slot portion 14, the insulating paper 19 is arranged in a state of being bent in a substantially U shape. The insulating paper 19 has a function of electrically insulating the coil 11 arranged in the slot portion 14 and the stator core 10. The insulating paper 19 is made of, for example, a sheet material or a film material made of an insulating resin. As shown in FIG. 2, the coil 11 is inserted and arranged inside the insulating paper 19 arranged in the slot portion 14. The coil 11 is made of, for example, copper or the like, and is composed of a flat wire having a substantially rectangular cross section. For example, a plurality of coils 11 are arranged side by side in the radial direction in one slot portion 14.

FIG. 3 is a block diagram showing a schematic system configuration of the coil heating device according to the present embodiment. The coil heating device 1 according to the present embodiment is configured as, for example, a high-frequency induction heating device, and induces heating of the coil 11 by passing a high-frequency current through the coil 11. The coil heating device 1 uses a high-frequency oscillator 2 that outputs a high-frequency current to the coil 11, an operation panel 3 for inputting operation information by the user, and a high-frequency oscillator 2 based on the operation information from the operation panel 3. It has a control unit 4 for controlling and a storage unit 5 for storing data.

The operation panel unit 3 is configured so that the operator can set heating conditions such as heating temperature and heating time according to the type of the stator core 10 from the operation panel. The heating conditions set by the operation panel unit 3 are stored in the storage unit 5 as a heating chart. The control unit 4 calls the heating chart stored in the storage unit 5 from the operation panel unit 3 according to the operation information. Then, the control unit 4 controls the high frequency oscillation unit 2 based on the called heating chart. As a result, the coil 11 can be heated under the heating conditions based on the heating chart.

The control unit 4 is, for example, a CPU (Central Processing Unit) 41 that performs control processing, arithmetic processing, etc., a ROM (Read Only Memory) or RAM (Random Access Memory) in which control programs, arithmetic programs, etc. executed by the CPU 41 are stored. ), A memory 42, and an interface unit (I / F) 43 for inputting / outputting signals to / from the outside, and the like, each of which is composed of hardware. The CPU 41, the memory 42, and the interface unit 43 are connected to each other via a data bus or the like.

By the way, as described above, an opening of the slot portion is formed between the tips of the teeth portions adjacent to the stator core. Therefore, in the conventional coil heating device, when a high-frequency current is passed through the coil, the magnetic flux easily penetrates the coil in the vicinity of the opening of the slot portion, and the temperature rises particularly easily in the vicinity of the opening. For example, as shown in FIG. 7, in the vicinity of the tooth side surface 100 and the yoke side surface 101 of the slot portion, the magnetic flux of the coil is attracted by the stator core (magnetic plate), so that the magnetic flux does not easily penetrate the coil. On the other hand, since the opening 103 of the slot portion is a space and there is nothing that attracts the magnetic flux, the magnetic flux easily penetrates the coil. For this reason, the temperature tends to rise particularly in the vicinity of the opening 103 of the slot portion, and the heating temperature of the coil may become non-uniform.

On the other hand, in the coil heating device 1 according to the present embodiment, the magnetic material 20 is provided in the opening 17 of the slot portion 14 formed between the tips of the adjacent teeth portions 13. The magnetic flux 20 near the opening 17 of the slot portion 14 is attracted by the magnetic body 20, and it becomes difficult for the magnetic flux to penetrate the coil 11 as in the vicinity of the tooth side surface 15 and the yoke side surface 16. As a result, the local temperature rise in the vicinity of the opening 17 of the slot portion 14 is suppressed, and the heating temperature of the coil 11 can be made uniform. That is, the coil 11 of the stator core 10 can be heated uniformly.

For example, at the time of induction heating of the coil 11, as shown in FIG. 4, a plate-shaped magnetic body 20 is provided in the opening 17 of the slot portion 14 so as to close the opening 17 from the outside. The magnetic body 20 has, for example, a rectangular cross section and extends in the direction perpendicular to the paper surface, and is made of a magnetic material such as a magnet, iron, or ferrite. As shown in FIG. 4, the magnetic flux lines of the coil 11 are connected without interruption around the coil 11 via the magnetic body 20, and the magnetic flux can be suppressed from locally penetrating the coil 11. After the induction heating of the coil 11, the magnetic material 20 is removed from the opening 17 of the slot portion 14.

FIG. 5A is a diagram showing a temperature change of the stator core when the coil is heated by the conventional coil heating device. FIG. 5B is a diagram showing a temperature change of the stator core when the coil of the stator core is heated by the coil heating device having the magnetic body 20 according to the present embodiment. In FIGS. 5A and 5B, the solid line (1) shows the temperature change near the opening 17 of the slot portion 14 of the stator core 10, and the dotted line (2) is near the tooth side surface 15 and the yoke side surface 16 of the stator core 10. It shows the temperature change.

In the conventional coil heating device of FIG. 5A, the temperature near the opening 103 of the slot portion of the stator core is significantly higher than the temperature near the tooth side surface 100 and the yoke side surface 101, and the temperature is high. It is non-uniform (Fig. 7). On the other hand, in the coil heating device 1 according to the present embodiment of FIG. 5B, the temperature near the opening 17 of the slot portion 14 of the stator core 10 and the temperature near the tooth side surface 15 and the yoke side surface 16 are substantially the same. It can be seen that the temperature is changing and the temperature is uniform.

As described above, in the coil heating device 1 according to the present embodiment, the magnetic material 20 is provided in the opening 17 of the slot portion 14 formed between the tips of the adjacent teeth portions 13. As a result, the coil 11 of the stator core 10 can be heated uniformly.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.
In the above embodiment, the magnetic material 20 is provided in the opening 17 of the slot portion 14 so as to close the opening 17 from the outside, but the present invention is not limited to this. For example, as shown in FIG. 6, the magnetic material 20 may be provided so as to fill the opening 17 of the slot portion 14. The configuration in which the magnetic material 20 is provided in the opening 17 of the slot portion 14 described above is an example, and the present invention is not limited to this.

1 coil heating device, 2 high frequency oscillator, 3 operation panel, 4 control, 5 storage, 10 stator core, 11 coil, 12 yoke, 13 teeth, 14 slots, 15 teeth side, 16 yoke side, 17 Opening, 18 protrusions, 19 insulating paper, 20 magnetic material

Claims (1)

A slot formed between adjacent tooth portions of a stator core having an annular yoke portion serving as a base and a plurality of teeth portions formed along the circumferential direction of the yoke portion and extending inward. It is a heating method of a coil heating device that heats the stator core and the coil by passing an electric current through a coil that is inserted into the portion and wound around the stator core.
Wherein the opening of said slot portion formed between the tips of adjacent teeth, the steps of Ru provided a magnetic substance,
A step of heating the stator core and the coil by passing an electric current through the coil wound around the stator core after the magnetic material is provided.
After heating, the step of removing the magnetic material from the opening of the slot portion and
A method for heating a coil heating device, which comprises .

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