Rotary electric machine

• US 7,193,348 B2
• Filed: 09/12/2005
• Issued: 03/20/2007
• Est. Priority Date: 07/11/2002
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Wada, Hitoshi, Ishida, Hiroshi, Ishikawa, Hiroaki
• Primary Examiner(s): Mullins; Burton
• Application Number:
  US11/223,103
• Publication Number:
  US 20060006756A1
• Time in Patent Office: 554 Days
• Field of Search: None
• US Class Current: 310/184
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 3/12 arranged in slots

Abstract

In a vehicular alternator, a stator is arranged to oppose a rotor in a housing. The stator includes a stator core, which forms a plurality of slots extending in an axial direction of the stator core, and a stator winding wound around the stator core. The stator winding includes electric conductors held in the slots. Each of the electric conductors has a circumferential width that is smaller than a circumferential distance between a first wall and a second wall defining the slot. The first wall and the second wall oppose each other in a circumferential direction. The electric conductors are alternately in contact with one of the first wall and the second wall.

Claims

1. A rotary electric machine, comprising:

a rotor;

a stator core disposed to oppose the rotor, wherein the stator core is formed with a plurality of slots extending in an axial direction, and each of the slots is defined with a first wall and a second wall that oppose each other in a circumferential direction; and

a stator winding wound around the stator core, wherein the stator winding is a continuous winding, the stator winding includes insertion portions held in the slots, each of the insertion portions has a cirumferential width that is smaller than a distance between the first wall and the second wall of the slot, one of the insertion portions contacts the first wall of the slot through an insulator, another one of the insertion portions contacts the second wall of the slot through the insulator, and the insertion portions alternately contact the first wall and the second wall.

2. The rotary electric machine according to claim 1, wherein an even number of insertion portions is inserted into each slot, half of the insertion portions contact the first wall of the slot, and the remaining half of the insertion portions contact the second wall of the slot.

3. The rotary electric machine according to claim 2, wherein the insertion portions contact the walls of the slot through the insulator by coil spring back.

4. The rotary electric machine according to claim 1, wherein the insertion portions contact the walls of the slot through the insulator by coil spring back.

5. The rotary electric machine according to claim 1, wherein the insertion portions are arranged in a row such that each insertion portion contacts one of the first and second walls through the insulator.