Salient-pole rotary electric machine

• US 4,795,933 A
• Filed: 07/28/1983
• Issued: 01/03/1989
• Est. Priority Date: 08/06/1982
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakai, Koichi
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US06/518,108
• Time in Patent Office: 1,986 Days
• Field of Search: 310/269, 310/214, 310/52, 310/53, 310/57, 310/58, 310/59, 310/60 R, 310/60 A, 310/61, 310/64, 310/65, 310/55
• US Class Current: 310/269
• CPC Class Codes: H02K 9/18 wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing
• CPC Class Codes: Y10S 174/20 Stator
• CPC Class Codes: Y10S 174/32 having means for cooling

Abstract

A salient-pole rotary electric machine comprises a stator including a stator core formed with a plurality of ventilation ducts spaced apart by a predetermined distance in its axial direction and extending in its radial direction, and a stator winding would around the stator core, and a rotor including a rotor shaft, a rotor rim rotatable together with the rotor shaft, a plurality of salient field poles disposed on the outer periphery of the rotor rim in circumferentially spaced apart relation and extending in the axial direction of the rotor rim, and cooling gas passages defined between every adjacent salient field poles. In the rotary electric machine, a closure member is bured in each of the cooling gas passages between the salient field poles to extend from one of the axial ends to the center of the cooling gas passage, and the closure members are disposed between the adjacent salient field poles in a relation alternate with each other in the axial direction of the salient field poles. The alternate arrangement of the closure members reduces the mechanical losses of the salient-pole rotary electric machine and ensures uniform cooling of the stator throughout the axial length of the stator.

Claims

1. A rotary electric machine of a salient pole type comprising a stator including a stator core and a stator winding wound around said stator core, said stator core being formed with a plurality of ventilation ducts spaced apart by a predetermined distance in its axial direction and extending in its radial direction, and a rotor including a rotor shaft, a rotor rim rotatable together with said rotor shaft, a plurality of salient field poles disposed on the outer periphery of said rotor rim in circumferentially spaced apart relationship and extending in the axial direction of said rotor rim, and cooling gas passages defined between every adjacent salient field pole, wherein a closure member having a total length about one-half that of the salient field pole is buried in each of said cooling gas passages between said salient field poles to extend from one of the axial ends to the center of said cooling gas passage, said closure members are being disposed between the adjacent salient field poles in an alternate relationship with each other in the axial direction of said salient field poles, and said closure members have a radial width such that each closure member extends from approximately an outer peripheral surface of the field poles to an outer peripheral surface of the rotor rim whereby cooling gas is prevented from flowing in an axial direction of the respective closure members.

2. A rotary electric machine of the salient pole type as claimed in claim 1, wherein said closure members are made of an electrical insulating material.