Permanent magnet motor or actuator with field weakening...

Details Permanent magnet motor or actuator with field weakening... Permanent magnet motor or actuator with field weakening...

2008-09-11

2011-12-06

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156330, C310S156370, C310S154480

Reexamination Certificate

active

08072107

ABSTRACT:
The present disclosure relates generally to a permanent magnet, brushless motor comprising a primary rotor having alternating magnetic poles around a circumference, a secondary rotor similar to the primary rotor. The primary rotor may be free to rotate by approximately plus or minus one pole of the secondary rotor. As such, when the two rotor components have opposite polarities aligned, the motor may be in a field weakened state. Generally, the field weakened state may be the normal state of the motor. As a significant load is encountered, the rotors may automatically transition to a non-weakened state wherein similar polarities are aligned on the rotors. A permanent magnet, brushless motor as described herein may be employed at a motor level or integrated into a linear actuator, wherein the rotor of the permanent magnet, brushless motor may include a hollow shaft.

REFERENCES:
patent: 6636788 (2003-10-01), Tamagawa et al.
patent: 2007/0205683 (2007-09-01), Kawamura et al.
patent: 2004064942 (2004-02-01), None
Machine translation JP2004064942 (2004).

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