Stator for inner rotor type mold brushless motor

• US 20080157610A1
• Filed: 12/04/2007
• Published: 07/03/2008
• Est. Priority Date: 12/28/2006
• Status: Active Grant

• Current Assignee: Ichinomiya Denki Co., Ltd.
• Original Assignee: Ichinomiya Denki Co., Ltd.
• Inventors: Watanabe, Koji, Shindo, Toshio
• Granted Patent: US 7,626,303 B2
• Time in Patent Office: Days
• US Class Current: 310/43
• 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 3/522 for generally annular cores with salient poles

Abstract

A stator includes split cores arranged in a cylindrical shape. Coils are wound continuously around teeth of split cores forming the same electrical phase via a bridge line. On the outer surface of the split core, openings are formed at the upper end face and the lower end face. Through these openings, a convex portion of a jig is inserted to an engagement groove, whereby the split core is supported by the jig. A bridge line of each coil is led out from the teeth side to the outer surface side through an outlet. The led-out bridge lines are placed in storage grooves in a mutually non-contact manner.

Claims

1. A stator for an inner rotor type mold brushless motor, comprising:

a plurality of split cores each corresponding to a tooth and arranged in a cylindrical shape;

end insulators, each of which covers the tooth of each split core for insulation; and

coils that are insulated from the split cores by the end insulators and are wound continuously around teeth of split cores forming a same electrical phase via a bridge line,

wherein

an outer surface of each split core is provided with openings at both ends of the split core in a motor axis direction, the openings communicating with each other, and an engagement groove that can engage with a jig that supports the split core, and

each end insulator is provided with an outlet and storage grooves, the outlet leading the bridge line of each coil to an outer surface side of the end insulator and the storage grooves accommodating bridge lines of coils forming different electrical phases in a mutually non-contact manner.

2. The stator for an inner rotor type mold brushless motor according to claim 1, wherein at least two or more outlets are provided for each end insulator,

wherein

a first outlet is continuous with all of the storage grooves of the end insulator, and

a second outlet is continuous with any one of the storage grooves of the end insulator.

3. The stator for an inner rotor type mold brushless motor according to claim 2, wherein the storage grooves are provided to be aligned in the motor axis direction in stages in number corresponding to the number of electrical phases to be formed by the coils, and each storage groove accommodates one bridge line in cooperation with a storage groove in a stage in a different number of an adjacent end insulator.

4. The stator for an inner rotor type mold brushless motor according to claim 3, wherein the storage groove accommodating one bridge line is linearly continuous with the storage groove of the adjacent end insulator that accommodates the bridge line in cooperation therewith.

5. The stator for an inner rotor type mold brushless motor according to claim 1, wherein the engagement groove is a dovetail groove.

6. The stator for an inner rotor type mold brushless motor according to claim 1 further comprising a mold resin that molds at least the storage grooves.

7. The stator for an inner rotor types mold brushless motor according to claim 6, wherein the mold resin is filled at least in the engagement grooves.