Frequency detector

Details Frequency detector Frequency detector

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.

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