Title:
SQUIRREL-CAGE ROTOR WITH PERMANENT MAGNET
Document Type and Number:
Japanese Patent JPS61177146
Kind Code:
A
Abstract:
PURPOSE:To prevent a magnet from demagnetizing by disposing a heat insulator between the permanent magnet mounting slot of a squirrel-cage rotor and the magnet, and interrupting the transfer of heat when melted aluminum is filled in the rotor conductor slot. CONSTITUTION:The prescribed number of steel plates punched with slots 2, 12, bolt holes 5, and a rotational shaft hole 7 are laminated to form a rotor core 11 from punched plates 1. A permanent magnet 3 coated with a heat insulator 4 on the outer periphery is inserted into the slot 12. A bolt 8 is inserted to the hole 5, and the steel plates are clamped together with the side plates of the same shape, not shown. Then, melted aluminum is filled in the slot 2, hardened, a rotor conductor 21 and a shortcircuiting ring, not shown, are formed at both ends of the conductor 21 to form a squirrel-cage rotor. Thus, it can prevent the heat of the melted aluminum from transferring to the magnet 3 to prevent the permanent magnet from demagnetizing and to prevent a motor from deteriorating in its performance.
Inventors:
HANAI TAKASHI
Application Number:
JP1430185A
Publication Date:
August 08, 1986
Filing Date:
January 30, 1985
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H02K1/27; H02K21/46; (IPC1-7): H02K21/08
Attorney, Agent or Firm:
Noriyuki Noriyuki