Insulation structure of rotary electrical machinery

Abstract

An insulation structure of rotary electrical machinery which electrically insulates teeth of a stator from a winding wound on the teeth includes: an insulator made from hard insulation material, disposed on both axial ends of the teeth, and having a side wall disposed along a side surface of the teeth crossing to a circumferential direction thereof, and a high-heat-conductive electrical-insulation resin sheet disposed along the side surface of the teeth and insulating the teeth from the winding, wherein an axial end portion of the high-heat-conductive electrical-insulation resin sheet is disposed between the side wall of the insulator and the side surface of the teeth and is stacked on the side wall in a prescribed axial extent.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a stator piece before a winding is wound in a stator having an insulation structure of rotary electrical machinery according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the stator piece.

FIG. 3 is a side view showing the stator piece.

FIG. 4 is a sectional view taken along the line I-I in FIG. 3.

FIG. 5 is a sectional view taken along the line II-II in FIG. 3.

FIG. 6 is a sectional view taken along the line III-III in FIG. 3.

FIG. 7 is a perspective view showing the assembly of a stator and a rotor of the electrical machinery of the embodiment.

FIG. 8 is a perspective view showing the stator piece after the winding is wound.

FIG. 9 is a perspective view showing a stator piece before winding having a conventional structure.

FIG. 10 is a sectional view taken along the line X-X in FIG. 9.

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9.

Claims

1. An insulation structure of rotary electrical machinery which electrically insulates teeth of a stator from a winding wound on the teeth comprising: an insulator made from hard insulation material, disposed on both axial ends of the teeth, and having a side wall disposed along a side surface of the teeth crossing to a circumferential direction thereof; anda high-heat-conductive electrical-insulation resin sheet disposed along the side surface of the teeth and insulating the teeth from the winding, whereinan axial end portion of the high-heat-conductive electrical-insulation resin sheet is disposed between the side wall of the insulator and the side surface of the teeth and is stacked on the side wall in a prescribed axial extent.

2. The insulation structure of rotary electrical machinery according to claim 1, wherein a thickness of a superposition portion of the high-heat-conductive electrical-insulation resin sheet which is stacked on the insulator is smaller than a thickness of a non-superposition portion of the high-heat-conductive electrical-insulation resin sheet which is not stacked on the insulator.

3. The insulation structure of rotary electrical machinery according to claim 1, wherein an axial length at which the high-heat-conductive electrical-insulation resin sheet and the side wall of the insulator are stacked is set based on a diameter of the stator.

4. An insulation structure of rotary electrical machinery which electrically insulates teeth of a stator from a winding wound on the teeth comprising: an insulator made from hard insulation material, disposed on both axial ends of the teeth, and having a side wall disposed along a side surface of the teeth crossing to a circumferential direction thereof; anda high-heat-conductive electrical-insulation laminated resin sheet formed by laminating a plurality of high-heat-conductive electrical-insulation resin sheets each varying an axial length thereof, disposed along the side surface of the teeth, and insulating the teeth from the winding, whereinan axial end portion of the high-heat-conductive electrical-insulation laminated resin sheet is stacked on the side wall of the insulator in a prescribed axial extent.

5. An insulation structure of rotary electrical machinery according to claim 4, wherein an axial length at which the high-heat-conductive electrical-insulation laminated resin sheet and the side wall of the insulator are stacked is set based on a diameter of the stator.