Speed controller for mill drives and the like

Details Speed controller for mill drives and the like Speed controller for mill drives and the like

1984-09-19

1985-12-03

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318329, 318434, 318331, 318317, G05B 500, H02D 516

Patent

active

045568308

ABSTRACT:
A speed controller for a mill drive has two control portions. The first control portion has a first speed of response for controlling mill speed during normal operation. The second control portion has a second speed of response, faster than the first speed of response, for controlling mill speed following abrupt changes in load torque. The first control portion has a reference speed input and this is compared with actual motor speed and the result gives a current reference signal. The current reference signal is compared with a signal representing actual current to derive an error signal used to control the supply of power to the motor. The second control portion multiplies the current reference signal with a signal representing flux to provide a signal representing a model of developed torque. This is compared with a signal representing a model of load torque and the difference integrated to provide a signal representing a model of motor speed. This is compared with actual motor speed and the difference integrated to provide the previously referred to model of load torque. The model of load torque signal is differentiated to provide a compensating speed signal. The compensating speed signal is used to adjust the comparison, in the first portion, of reference speed and actual speed.

REFERENCES:
patent: 3617844 (1971-11-01), Grygera
patent: 4243921 (1981-01-01), Tamura et al.
patent: 4268782 (1981-05-01), Kawada et al.
patent: 4311951 (1982-01-01), Walker et al.
patent: 4446409 (1984-05-01), Rawicz et al.
patent: 4476417 (1984-10-01), Zimmermann

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