Stator winding structure for gap winding type electric rotary machine

• US 4,137,471 A
• Filed: 12/20/1976
• Issued: 01/30/1979
• Est. Priority Date: 12/25/1975
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sato, Masaki, Takahashi, Noriyoshi, Takahashi, Miyoshi, Watanabe, Mashatoshi
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/752,100
• Time in Patent Office: 771 Days
• Field of Search: 310/254, 310/51, 310/214, 310/258, 310/215, 310/259, 310/194, 310/208, 310/269, 310/179, 310/43, 310/45, 310/180, 310/184, 336/100, 264/272
• US Class Current: 310/51
• CPC Class Codes: H02K 3/00 Details of windings
• CPC Class Codes: H02K 3/47 Air-gap windings, i.e. iron-free windings

Abstract

In a gap winding type electric rotary machine, a stator winding consisting of a plurality of stator coils is mounted on the inner surface of a stator core within the air gap defined by the clearance between the stator core and the rotor core, in such a manner that the stator coils are grouped together in a plurality of stator coil units and each stator coil unit is encapsulated in a solid casing comprising an outer cover fixed to the inner surface of the stator core through an elastic sheet and an inner cover closing the outer cover. The inner clearance within the solid casing is also provided with an elastic sheet.

Claims

1. A gap winding type electric rotary machine having a stator core, a rotor core disposed in a bore of said stator core, a stator winding disposed in a cylindrical gap defined between said stator core and said rotor core, and supporting means for fixing said stator winding on the inner surface of said stator core, said stator winding comprising a plurality of coils, characterized in that each of said coils is supported by said supporting means and comprises

a plurality of conductors,

electric insulating means covering and bundling said plurality of conductors,

a solid and nonmagnetic casing enclosing said electric insulating means, and

vibration absorbing means disposed between said electric insulating means and said solid and nonmagnetic casing.

2. The gap winding type electric rotary machine as defined in claim 1, wherein said solid and nonmagnetic casing comprises a plurality of detachable covers.

3. A gap winding type electric rotary machine having a stator core, a rotor core disposed in a bore of said stator core, a stator winding disposed in a cylindrical gap defined between said stator core and said rotor core, and supporting means for fixing said stator winding on the inner surface of said stator core, said stator winding comprising a plurality of coils, characterized in that each of said coils is supported by said supporting means and comprises

a plurality of conductors,

electric insulating means covering and bundling said plurality of conductors,

a solid and nonmagnetic casing enclosing said electrically insulated conductors,

first vibration absorbing means disposed between said electric insulating means and said solid and nonmagnetic casing, and

second vibration absorbing means disposed between said solid and nonmagnetic casing and the inner surface of said stator core and between said solid and nonmagnetic casing and said supporting means.

4. The gap winding type electric rotary machine as defined in claim 3, wherein said solid and nonmagnetic casing comprises a plurality of detachable covers.

5. The gap winding type electric rotary machine as defined in claim 3, wherein said coils are disposed in first and second radially separated circumferential planes and have the same electrical phase.

6. A gap winding type electric rotary machine having a stator core, a rotor core disposed in a bore of the stator core, a cylindrical gap being defined between the stator core and the rotor core, a stator winding disposed in the gap, and supporting means to fix the stator winding on the inner surface of the stator core, characterized in that the stator winding comprises a plurality of coil unit groups, at least one of said coil unit groups being encapuslated in enveloping means for concentrating vibrations within the respective coil unit group, said enveloping means comprising a solid casing which is supported by said supporting means, and

vibration absorbing means comprising an elastic sheet surrounding said at least one coil unit group and disposed at least at the inside of said casing between said at least one coil unit group and said casing.

7. A gap winding type electric rotary machine having a stator core, a rotor core disposed in a bore of the stator core, a cylindrical gap being defined between the stator core and the rotor core, a stator winding disposed in the gap, and supporting means to fix the stator winding on the inner surface of the stator core, characterized in that the stator winding comprises a plurality of coil unit groups, at least one of said coil unit groups being encapsulated in enveloping means for concentrating vibrations within the respective coil unit group, said enveloping means comprising a solid casing which is supported by said supporting means, and vibration absorbing means including an elastic sheet covering part of said casing and being disposed at least at the inside of said casing between said casing and said stator core.

8. The gap winding type electric rotary machine as defined in claim 7, wherein said vibration absorbing means further includes an elastic sheet within said casing surrounding said coil unit group and electrical insulating means covering said coil unit group within said elastic sheet.

9. A gap winding type electric rotary machine having a stator core, a rotor core disposed in a bore of the stator core, a cylindrical gap being defined between the stator core and the rotor core, a stator winding disposed in the gap, and supporting means to fix the stator winding on the inner surface of the stator core, characterized in that the stator winding comprises a plurality of coil unit groups, each of said coil unit groups comprising a plurality of coil units disposed in first and second radially separated planes, the coil units of each coil unit group having the same electrical phase, at least one of said coil unit groups being encapsulated in enveloping means for concentrating vibrations within the respective coil unit group, said enveloping means comprising a solid casing which is supported by said supporting means, and vibration absorbing means including an elastic sheet surrounding said coil unit group and disposed at least at the inside of said casing between said coil unit and said casing.