Laminated core structure of motor

• US 7,626,306 B2
• Filed: 11/28/2007
• Issued: 12/01/2009
• Est. Priority Date: 12/01/2006
• Status: Active Grant

• Current Assignee: Oriental Motor Company Limited
• Original Assignee: Oriental Motor Company Limited
• Inventors: Sato, Yasuo
• Primary Examiner(s): Lam; Thanh
• Application Number:
  US11/946,476
• Publication Number:
  US 20080129141A1
• Time in Patent Office: 734 Days
• Field of Search: 310/43, 310/45, 310/254, 310216-217, 310/261, 310/259
• US Class Current: 310/216.055
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/2713 the magnetisation axis of the magnets being axial, e.g. claw-pole type
• CPC Class Codes: H02K 2201/09 Magnetic cores comprising laminations characterised by being fastened by caulking
• CPC Class Codes: H02K 37/14 with magnets rotating within the armatures

Abstract

The laminated core structure of a motor includes a stator iron core formed by laminating a plurality of stator iron core thin sheets in which a plurality of magnetic poles are provided at fixed intervals along the circumferential direction on the inner peripheral side so as to project toward the center direction, and a rotor iron core arranged on the axis line of the stator iron core concentrically with the stator iron core and formed by laminating a plurality of disc-shaped rotor iron core thin sheets, the stator iron core and the rotor iron core each being fastened by caulking the plurality of thin sheets to each other. The core loss produced by caulking is decreased by particular placement of the center of a caulking uneven part of the stator iron core thin sheet and the center of a caulking uneven part of the rotor iron core thin sheet.

Claims

1. A laminated core structure of a motor, comprising a stator iron core formed by laminating a plurality of stator iron core thin sheets in which a plurality of magnetic poles are provided at fixed intervals along the circumferential direction on the inner peripheral side so as to project toward the center direction, and a rotor iron core which is arranged on the axis line of the stator iron core concentrically with the stator iron core and is formed by laminating a plurality of disc-shaped rotor iron core thin sheets, the stator iron core and the rotor iron core each being fastened by caulking the plurality of thin sheets to each other,

wherein the center of a caulking uneven part of the stator iron core thin sheet is provided on the outside of a minimum circle the radius of which is a distance from the center of the stator iron core thin sheet to the shortest outer edge thereof, and the center of a caulking uneven part of the rotor iron core thin sheet is provided on the inside from an outer edge of the rotor more than the width from an outside edge of the stator iron core thin sheet to a slot part thereof.

2. The laminated core structure of a motor according to claim 1, wherein the stator iron core has a substantially square-shaped external shape, and the center of the caulking uneven part of the stator iron core thin sheet is provided between an assembling screw hole formed at four corners of the stator iron core thin sheet and a corner outer edge of the stator iron core thin sheet.