Electricity: motive power systems – Positional servo systems – With compensating features
Patent
1993-05-13
1994-09-27
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With compensating features
318629, 318432, G05B 500
Patent
active
053509897
ABSTRACT:
A torque oscillation compensation system and circuit that senses battery current to compensate for electrical motor torque pulsations. An input source provides a torque/current command input signal that drives the motor, and a summing device has one input coupled to receive the torque/current command input signal. A controller is coupled to the summing device and to power switching circuitry that is coupled between the battery and the electric motor. An oscillation compensation circuit is coupled between the battery and the summing device that generates a compensation signal that is combined with the torque/current command input signal and compensates for output shaft oscillators. The oscillation compensation circuit comprises an AC coupling capacitor, an amplifier having a predetermined transfer function that is designed to provide for the proper amount of compensation. The present invention compensates for the torque fluctuations caused by induction motors and permits stable operation thereof. The novelty of the present invention is that compensation is achieved by sensing the AC ripple component of the battery or DC power supply input to power switching circuitry used to drive the motor. This signal is an indication of torque fluctuation and is used to to modulate the motor current and/or motor slip and/or commutating angle and/or the motor field current to eliminate the torque fluctuations of the motor output shaft.
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Alkov L. A.
Cabeca John W.
Denson-Low W. K.
Hughes Aircraft Company
Shoop Jr. William M.
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