Motor stator and stator manufacturing method

• US 8,063,518 B2
• Filed: 10/30/2007
• Issued: 11/22/2011
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Asai, Masataka
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US12/513,766
• Publication Number:
  US 20090302694A1
• Time in Patent Office: 1,484 Days
• Field of Search: 310/43, 310/45, 310/208, 310/254.1, 310/216.008, 310/216.009, 310/216.084, 310/216.135, 428/339, 428/323, 428/327, 428/332
• US Class Current: 310/43
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: H02K 3/18 Windings for salient poles
• CPC Class Codes: H02K 3/325 for windings on salient poles, such as claw-shaped poles
• CPC Class Codes: H02K 9/223 Heat bridges
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A motor stator includes a plurality of stator cores constituted of divided cores and cassette coils which are conductive coils. One of the divided core and the cassette coil is integrally formed with an insulator of a thermosetting resin by insert molding. A stator assembly including the plurality of cassette coils is covered with a thermosetting resin by molding to produce the state.

Claims

1. A motor stator including a plurality of stator coils, wherein each of said plurality of stator coils is formed of a conductive coil wound on a divided stator core, wherein

the divided stator core is integrally formed with an insulator made of a thermosetting resin by insert molding,

the stator including the plurality of stator coils is covered with a molded layer made of a thermosetting resin by molding, and

boundary surfaces between each divided stator core and each stator coil include only a boundary surface between the divided stator core and the insulator, a boundary surface between the insulator and the molded layer, and a boundary surface between the molded layer and the stator coil.

2. The motor stator according to claim 1, wherein

the thermosetting resin forming the insulator and the thermosetting resin forming the molded layer are equal in linear expansion coefficient.

3. The motor stator of claim 1, wherein the molded layer is made of a thermosetting resin filled with high-heat conductivity fillers.

4. The motor stator according to claim 1, wherein

the thermosetting resin forming the insulator is larger in heat conductivity than the thermosetting resin forming the molded layer.

5. The motor stator according to claim 1, wherein

the conductive coil is a coil that has a flat shape in section and is wound edgewise, and the insulator is partly formed at four corners of one of the stator core and the conductive coil.

11. The motor stator according to claim 3, wherein

the resins equal in linear expansion coefficient are an epoxy thermosetting resin containing 60 to 80 vol % of filler, and

the linear expansion coefficient is 10 to 20 ppm/°

C.

6. A motor stator including a plurality of stator coils wherein each of said plurality of stator coils is formed of a conductive coil wound on a divided stator core, wherein

the conductive coil is integrally formed with an insulator made of a thermosetting resin by insert molding,

the stator including the plurality of stator coils is covered with a molded layer made of a thermosetting resin by molding, and

boundary surfaces between each divided stator core and each stator coil include only a boundary surface between the divided stator core and the molded layer, a boundary surface between the molded layer and the insulator, and a boundary surface between the insulator and the stator coil.

7. The motor stator according to claim 6, wherein

the thermosetting resin forming the insulator and the thermosetting resin forming the molded layer are equal in linear expansion coefficient.

8. The motor stator according to claim 7, wherein

the resins equal in linear expansion coefficient are in epoxy thermosetting resin containing 60 to 80 vol % of filler, and

the linear expansion coefficient is 10 to 20 ppm/°

C.

9. The motor stator according to claim 7, wherein

the thermosetting resin forming the insulator is larger in heat conductivity than the thermosetting resin forming the molded layer.

10. The motor stator according to claim 6, wherein

the conductive coil is a coil that has a flat shape in section and is wound edgewise, and

the insulator is partly formed at four corners of one of the stator core and the conductive coil.

12. The motor stator of claim 6, wherein the molded layer is made of a thermosetting resin filled with high-heat conductivity fillers.