Controller for motor

Details Controller for motor Controller for motor

2007-08-07

2009-11-24

Masih, Karen (Department: 2837)

Electricity: motive power systems

Induction motor systems

With plural separately movable rotors

C318S727000, C318S721000

Reexamination Certificate

active

07622883

ABSTRACT:
There is provided a controller for a motor capable of changing the phase difference between two rotors that can prevent demagnetization of permanent magnets or the rotors. The motor has two rotors each having a permanent magnet and phase difference changing driving means for changing the phase difference between the rotors. The controller has a demagnetization determining means for determining whether or not demagnetization of the permanent magnets of the rotors occurs during operation of the motor, and rotor phase difference controlling means for controlling the phase difference changing driving means to change the phase difference between the rotors from a current phase difference to a phase difference that results in a higher strength of a composite field of the permanent magnets if the result of determination by the demagnetization determining means is positive.

REFERENCES:
patent: 4305031 (1981-12-01), Wharton
patent: 5245238 (1993-09-01), Lynch et al.
patent: 6563246 (2003-05-01), Kajiura et al.
patent: 2004/0207475 (2004-10-01), Minamino et al.
patent: 2002-204541 (2002-07-01), None

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