Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-11-06
1999-11-23
Masih, Karen
Electricity: motive power systems
Induction motor systems
Primary circuit control
318437, 318607, 318798, 318778, 388911, 360 75, H02P 528
Patent
active
059906561
ABSTRACT:
A frequency detector for a PLL controller, the controller being for generating an output signal to control a motor driver electrically connected to a motor having multiple phase windings arranged as a stator and a rotor having a permanent magnet or a DC current excitation winding for rotating the rotor, the motor driver selectively establishing current paths through selected windings in response to said output signal, to provide maximum torque to the rotor based on the rotational position of the rotor relative to the windings, the frequency detector comprising a monitor for detecting a number of pulses in said output signal during a time period between a first and a second rotational position of the rotor relative to the windings and a governor for generating a frequency control signal as a function of said number of pulses, wherein the PLL controller generates said output signal at output frequencies selectively as a function of said frequency control signal, whereby the frequency detector minimizes a difference between the frequency of the output signal and a corresponding rotational frequency of the rotor.
REFERENCES:
patent: 4409533 (1983-10-01), Kawabata
patent: 4495474 (1985-01-01), Nishikawa et al.
patent: 5384675 (1995-01-01), Crawforth et al.
patent: 5729118 (1998-03-01), Yanagisawa et al.
Masih Karen
Quantum Corporation
Zarrabian Michael
LandOfFree
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