PERMANENT MAGNET TYPE SYNCHRONOUS ELECTRIC MOTOR, ITS MANUFACTURE AND CENTRIFUGAL COMPRESSOR PROVIDED WITH THE PERMANENT MAGNET TYPE SYNCHRONOUS ELECTRIC MOTOR

Japanese Patent JP3484051

B2

PROBLEM TO BE SOLVED: To provide an electric motor which can be operated/rotated at a high speed and has a highly reliable permanent magnet and to provide a rotor used for it.
SOLUTION: The rotor of an electric machine has a rotary shaft 1a and a permanent magnetic sleeve, engaged with the rotary shaft 1a by oil pressure engagement. The permanent magnetic sleeve is formed by successively providing plural ring-like permanent magnetic 3 and covering the outer peripheral parts of the ring-like permanent magnets 3 by CFRP(carbon fiber reinforcing plastic) 4b. A rigid sleeve 2b is arranged for the inner peripheral side of the permanent magnets 3 and titanium rings 5 and 6 on the shaft end sides of the permanent magnets 3 as protection. Thus, the inner diameter of the sleeve is temporarily enlarged by introducing a high pressure oil into the inner periphery of the rigid sleeve 2b from a hydraulic path 20b formed in the rigid sleeve 2b. engagement with the rotary shaft can be realized, and a fastening margin is formed between the sleeve and the rotary shaft, when oil pressure is abolished. Thus, idling of the sleeve can be prevented, even at high speed rotation.

Haruo Miura
Kazuki Takahashi
Hideo Nishida
Naohiko Takahashi
Yasuo Fukushima

JP24502697A

January 06, 2004

September 10, 1997

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Hitachi Industries Co., Ltd.

H02K1/28; H02K1/27; H02K15/02; H02K15/03; H02K21/12; H02K21/16; (IPC1-7): H02K1/27; H02K1/28; H02K15/02; H02K21/16

JP9224339A
JP9195982A
JP984284A
JP6351182A
JP5256309A
JP5236687A
JP311948A
JP2231945A

Yasuo Sakuta

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