Stator coil heating apparatus and stator coil heating method

a stator coil and heating apparatus technology, applied in the direction of induction heating, dynamo-electric machines, packaging, etc., can solve the problems of increasing the temperature of the stator in a slow manner, increasing the cost of electrical energy consumption, and increasing the heating time of the heating process. , to achieve the effect of high cost, and prolonging the heating tim

US20100295412A1Inactive Publication Date: 2010-11-25TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2010-11-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

A stator coil heating apparatus and a stator coil heating method that are capable of effectively preventing a core from thermal deformation particularly caused due to a magnetic flux generated by a coil head, without the problem of heating temperature variation, and also shortening a time for the process of heating a stator coil, are provided.A stator coil heating apparatus A to heat a stator coil L wound around a circular core F, comprises: induction heating coil heads 1 and 11 that heat the circular coil L by generating an inductive effect acting from outside in the thickness direction of the core F, against circular winding coil bases La and Lb that are sticking out of end faces Fa and Fb of the core F in the thickness direction thereof; and shields 2 and 12 that block a magnetic flux generated by the coil heads 1 and 11, out of the end faces Fa and Fb of the core F in the thickness direction thereof.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to a stator coil heating apparatus and a stator coil heating method that are used in the manufacturing process of a stator such as an automotive electrical generator.BACKGROUND OF THE ART

[0002] As generally practiced, in the manufacturing process of a stator that is an automotive electrical generator, a three-phase stator coil is wound around a circular core, and after that, the entire stator coil including a circular winding coil base that is sticking out of an end face of the core in the axial direction thereof, is impregnated with varnish. In this state of things, the stator coil is heated, and thereby the impregnating varnish is harden-dried.

[0003] After impregnating the stator coil with varnish, it is conventionally practiced that the entire stator is inserted into a heating furnace while being rotated, and thereby the impregnating varnish is harden-dried with heated air.

[0004] However, in the method of harden-drying varnis...

Examples

Embodiment Construction

[0109]FIG. 1 is an exploded perspective view showing a stator coil heating apparatus according to an embodiment of the present invention, FIG. 2 is a plain view showing the same stator coil heating apparatus set on a stator, and FIG. 3 is a half cutaway view showing the same stator coil heating apparatus set on a stator.

[0110]This embodiment will be explained with the example of heating a stator coil of a stator that is an automotive electrical generator. However, it is not limited thereto.

[0111]As shown in FIG. 1 through FIG. 3, a stator M comprises a circular core F constructed of a plurality of thin silicon steel plates layered in the thickness direction and a three-phase stator coil L wound around the core F. And circular winding coil bases La and Lb are sticking out of the end faces Fa and Fb of the core F in the thickness direction (the axial direction: the vertical direction in Figure) thereof, respectively. The entire stator coil L including these winding coil bases La and L...