Stators of dynamoelectric machines

• US 4,415,822 A
• Filed: 09/23/1981
• Issued: 11/15/1983
• Est. Priority Date: 10/03/1980
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Toshiba Corporation)
• Original Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Toshiba Corporation)
• Inventors: Aiba, Toshiyuki
• Primary Examiner(s): GONZALES, JOHN F
• Application Number:
  US06/304,906
• Time in Patent Office: 783 Days
• Field of Search: 310/52, 310/58-60, 310/64, 310/65
• US Class Current: 310/59
• CPC Class Codes: H02K 1/20 with channels or ducts for flow of cooling medium

Abstract

A stator of a dynamoelectric machine comprises an iron core formed by laminating irons sheets, armature coils received in slots of the iron core, a plurality of spacer blocks extending radially in contact with an end surface of the iron core, clamping end plates for clamping the iron core, and buffer boards located between the spacer blocks. The spacer blocks include long ones located between an outer periphery of the iron core and teeth portions thereof and short ones located between the outer periphery and the bottom portions of the slots. Each of the short spacer blocks is provided with a radially extending channel formed on the side surface facing to the end surface of the iron core and the channel has gas air outlet and one end opened on the side facing to the slot bottom to form an inlet for a cooling gas.

Claims

1. In a stator of a dynamoelectric machine of the type comprising an iron core formed by laminating iron sheets, armature coils received in slots of said iron core, a plurality of spacer blocks extending radially in contact with an end surface of said iron core, said spacer blocks including long spacer blocks extending between an outer periphery of the iron core and teeth portions thereof and short spacer blocks extending between said outer periphery and the bottom portions of said slots, and clamping end plates for axially clamping said iron core, the improvement in which each of said short spacer blocks is provided with a radially extending channel formed on the side surface facing toward the end surface of said iron core, said channel having a gas outlet and an end opened on the side facing to said slot bottom to form an inlet for a cooling gas, each of said short spacer blocks being provided with a groove formed at an intermediate portion thereof and provided with end openings opened to the spaces between said short and long spacer blocks, said channel being terminated at and connected with said groove, and in which buffer boards are provided between the long and short spacer blocks to form a narrow space between said long and short spacer blocks to change gas-flow speed for effectively guiding cooling gas into said inlet and cooling said slot bottom, said buffer boards being disposed between said groove and the end opening of said channel.