Stator for outer rotor-type multi-pole generator

• US 6,333,579 B1
• Filed: 03/20/2000
• Issued: 12/25/2001
• Est. Priority Date: 03/31/1999
• Status: Active Grant

• Current Assignee: Sawafuji Electric Company Limited
• Original Assignee: Sawafuji Electric Company Limited
• Inventors: Hirano, Hidetoshi, Tozuka, Masayuki
• Primary Examiner(s): Nguyen, Tran
• Assistant Examiner(s): LE, DANG D
• Application Number:
  US09/528,987
• Time in Patent Office: 645 Days
• Field of Search: 310/194, 310/71, 310/43, 310/254, 310/259, 310/258, 310/260
• US Class Current: 310/194
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2203/12 Machines characterised by the bobbins for supporting the windings
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 7/1815 structurally associated with reciprocating piston engines general aspects of generating sets, e.g. housing, F02B63/04
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

In a stator for an outer rotor-type multi-pole generator, in which coils of an identical type but different from a coil wound around a particular one of cylindrical portions integrally included in a bobbin to cover a plurality of salient poles of a stator core, are wound around a pair of the cylindrical portions adjoining and located on opposite sides of the particular cylindrical portion, a recess concaved inwards in a radial direction of a core base is provided in a guide projection at a location corresponding to the particular one of the cylindrical portions, and a crossover wire is disposed in the recess. Thus, the particular cylindrical portion and the crossover wire can be insulated from each other to ensure a stable insulating property, while avoiding an increase in operating steps.

Claims

1. A stator for an outer rotor multi-pole generator, comprising a stator core including a plurality of salient poles projectingly mounted at equal distances from one another on an outer periphery of a core base formed into a ring shape, and a bobbin made of a synthetic resin, wherein said bobbin is integrally provided with a main bobbin portion covering at least the outer periphery of said core base, a plurality of cylindrical portions protruding from said main bobbin portion so as to cover said salient poles excluding tip ends of the salient poles, and a guide projection which protrudes in a cylindrical shape from one end surface of said main bobbin portion, said stator core and said bobbin being coupled by molding to each other, and a plurality of first coils identical to one another but different from a second coil wound around a particular one of said cylindrical portions, each one of a pair of the first coils is wound around a respective one of a pair of the cylindrical portions adjoining and located on opposite sides of said particular one of the cylindrical portions, a crossover wire connecting said pair of identical first coils being disposed along a portion of an outer periphery of said guide projection, and wherein said guide projection is partially depressed radially inwardly to define a recess between the outer periphery of the guide projection and radially inner ends of said first and second coils, said crossover wire being disposed in said recess.

2. A stator for an outer rotor multi-pole generator according to claim 1, wherein said first coils are DC coils and said second coil is an exciter coil.

3. A stator for an outer rotor multi-pole generator, comprising a stator core including a plurality of salient poles projectingly mounted at equal distances from one another on an outer periphery of a core base formed into a ring shape, and a bobbin made of a synthetic resin, wherein said bobbin is integrally provided with a main bobbin portion covering at least the outer periphery of said core base, a plurality of cylindrical portions protruding from said main bobbin portion so as to cover said salient poles excluding their tip ends, and a guide projection which protrudes in a cylindrical shape from one end surface of said main bobbin portion, said stator core and said bobbin being coupled by molding to each other, and a plurality of first coils identical to one another but different from a second coil wound around particular one of said cylindrical portions, each one of a pair of the first coils being wound around a respective one of a pair of the cylindrical portions adjoining and located on opposite sides of said particular one of the cylindrical portions, respectively, a crossover wire connecting said pair of identical first coils being disposed along a portion of an outer periphery of said guide projection, and wherein said particular one of said cylindrical portions integrally included in said bobbin is integrally provided at a base end thereof with a collar which protrudes radially outwardly from and extends about an outer periphery of the second coil wound around said particular one of the cylindrical portions, said collar being positioned radially outwardly of radially inner ends of said first coils, said crossover wire being disposed between said collar and said guide projection.

4. A stator for an outer rotor multi-pole generator according to claim 3, wherein said collar has a pair of grooves provided therein, and lead wires, which extend from opposite ends of the second coil wound around said particular cylindrical portion and which are connected to an external lead wire terminal and an earth terminal, are inserted through said grooves.

5. A stator for an outer rotor multi-pole generator according to claim 3, wherein said first coils are DC coils and said second coil is an exciter coil.