Method and apparatus for reducing recurrent fluctuations in moto

Details Method and apparatus for reducing recurrent fluctuations in moto Method and apparatus for reducing recurrent fluctuations in moto

1991-02-27

1992-06-16

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

Unwanted harmonic or voltage component elimination...

318602, G05B 501

Patent

active

051227193

ABSTRACT:
In a system for compensating predictable periodic speed variations in the electric motor of a velocity servo, which speed variations may include variations at frequencies above the velocity servo bandwidth, circuitry is provided for generating synchronized reference signal frequency components corresponding in frequency to at least one ripple frequency component of the torque. Each of the synchronized reference signal frequency components is adjusted, while the motor shaft is revolving, in phase and amplitude in a sense to reduce the ripple at that frequency in motor speed. Both manual and self-adjusting embodiments are shown, each including real time spectrum analysis of motor torque to guide the phase and frequency adjustments.

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