JPS6028750A - Cooling structure of stator coil - Google Patents

Abstract

PURPOSE:To suppress the temperature rise of a winding by interposing a thermal conductive heat transfer member between a coil end and the inner surface of an outer frame, thereby reducing thermal resistance of air between the coil end and the outer frame. CONSTITUTION:A pair of heat transfer rings 12 made of a thermal conductive material are interposed between the coil end 8' of a coil 8 and the inner surface of an outer frame 1 secured with a stator core 7. This rings 12 are shrinkage- fitted fixedly at the coils 8' of both sides to the opposed inner surfaces of the outer frame 1 at both sides. The thermal resistance between the coil ends 8' and the outer frame 1 decreases by mounting the rings 12, and a heat transfer passage, increases, thereby reducing the temperature of the coil 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling structure for a stator coil in a rotating machine such as an electric motor.

Conventionally, there was a motor shown in FIG. 1 as an electric motor.

In the figure, 1 is an outer frame, 2 is a load side bracket, 3 is an anti-load side bracket, 4 is an outer fan cover for directing the wind from the outer fan 5 along the outer frame 1, and 6 is supported by bearings 10 and 11. 1 is a stator core attached to the outer frame 1, 8 is a coil attached to the stator core 7, 8' is a coil end, and 9 is a rotor core attached to the shaft 6. In such an electric motor, the heat generated in the coil 8 is transmitted to the stator core 1 and is further removed from the outer frame 1 by the cooling air blown and stopped by the outer fan 5. Also, since the heat generated at the coil end 8' has a large thermal resistance of air,
It is transmitted from the stator core T to the outer frame 1 and released to the outside. Figure 2 shows the thermal circuit. In the conventional electric motor, the thermal resistance R1 of the air between the coil end 8' and the outer frame 10 is very large, so the heat of the coil end 8' is transmitted to the outside through R3-R4-R5-R6. Become. Therefore, the temperature of the coil as a whole increases because the heat transfer path is narrow.

In view of the above-mentioned conventional circumstances, the present invention aims to suppress the temperature rise of the winding by reducing the thermal resistance of the air between the coil end and the outer frame.

That is, the present invention provides a cooling structure for a stator coil of a rotating machine in which a heat transfer member made of a material with good thermal conductivity is interposed between the coil end of the stator coil of a rotating machine and the inner surface of an outer frame to which a stator core is fixed. It is. The present invention also provides a stator coil cooling structure in which a gap formed between the coil end and the inner surface of the outer frame is filled with resin with a heat transfer member interposed therebetween.

Hereinafter, embodiments of the present invention will be explained based on FIGS. 3 and 4.

In these figures, the same elements K as in FIG. 1 are given the same reference numerals to simplify the explanation.

FIG. 3 is a diagram showing an embodiment of the first invention, and 12 in the figure indicates heat generated between the coil end 8' of the coil 8 and the inner surface of the outer frame 1 to which the stator core 1 is fixed. A pair of heat transfer rings used as heat transfer members made of a material with good conductivity.

This heat transfer ring 12 is fixed by shrink-fitting the coil ends 8' on both sides to the inner surfaces of the outer frame 1 on both sides facing each other.

According to this configuration, the thermal resistance between the coil end 8' and the outer frame 1 (R1 in FIG. 2) is reduced by attaching the heat transfer ring 12.
) becomes small, the heat transfer path increases, and the temperature of the coil 8 can be lowered.

In the above embodiment, the heat transfer ring 12 is interposed, but a tape-like member made of a material with good thermal conductivity may be wrapped around the outer periphery of the insulator of the coil end 8' to serve as a heat transfer member. The effect of this can be obtained.

FIG. 4 is a diagram showing an embodiment of the second invention, in which 13 shows the heat transfer ring 12t attached to the coil end 8'.
The resin fills the gap formed between the inner surface of the outer frame 1 and the inner surface of the outer frame 1 under partial pressure. is filled with.

According to this configuration, the thermal resistance between the coil end 8 and the outer frame 1 (R1 in FIG. 2) is reduced by the intervention of the heat transfer ring 12.
By filling the gap with the resin 13, the thermal resistance of the gap can be reduced, the heat transfer path can be increased, and the temperature of the coil 8 can be lowered. .

In this embodiment, the heat transfer ring 12 is interposed, but a tape-like member made of a material with good thermal conductivity is wrapped around the outer periphery of the insulator of the coil end 8', and this tape-like member and the outer frame are The same effect can be obtained by filling the gap with the inner surface of the first part with resin.

As explained above, according to the present invention, by interposing a heat transfer member with good thermal conductivity between the coil end and the inner surface of the outer frame, the thermal resistance between the coil end and the outer frame can be reduced. By making it possible to reduce the coil temperature, it is possible to increase the heat capacity of the rotating machine of the electric motor, and it is possible to produce a larger output in a smaller space.
It has the advantage of being compact and can be provided at low cost.

Furthermore, by filling the gap formed between the coil end and the inner surface of the outer frame with resin with the heat transfer member interposed therebetween, the thermal resistance of the selective gap can be reduced, and the coil temperature can be further reduced. The coil cooling effect can be further increased.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing the structure of a conventional electric motor, Figure 2 is a diagram showing the heat circuit from the coil to the outside air, Figures 3 and 4 are
The figure is a cross-sectional side view showing an embodiment of the present invention. 1... Outer frame T... Stator core 8... Coil 8
'... Coil end 12... Heat transfer ring 13...
・Resin agent Masuo Oiwa (and 2 others) $1 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] α) A heat transfer member made of a material with good thermal conductivity is interposed between the coil end of the stator coil of the rotating machine and the inner surface of the outer frame to which the stator core is fixed. Features a stator coil cooling structure. (2) A heat transfer member made of a material with good thermal conductivity is interposed between the coil end of the stator coil of the rotating machine and the inner surface of the outer frame to which the stator core is fixed; A cooling structure for a stator coil, characterized in that a gap formed between the coil end and an inner surface of the outer frame is filled with resin in the above-mentioned state.