Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1984-01-20
1986-01-14
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318318, 318490, 318800, 318801, 318802, H12P 516, H02P 536
Patent
active
045647950
ABSTRACT:
An improved motor speed control system for high speed, high resolution motor control applications such as centrifuges is presented. A proportional, or proportional and integral motor control system is provided with improved circuitry which uses digital phase lock techniques to generate a speed difference signal that accurately reflects the difference between the actual and desired speed of the motor. This speed difference signal is used to adjust the speed of the motor until the actual and desired speeds become approximately equal to one another. An error integrating network may then be enabled to eliminate any remaining difference between actual and desired speed, thereby assuring a negligible speed error.
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Title: A Phase-Locked Loop Motor Control System, Author: D. H. Smithgall, Date: Nov. 1975, Publisher: IEEE.
Franklin Robert C.
Parkes Christopher W.
Beckman Instruments Inc.
Harder P. R.
Ip Paul Shik Luen
Markl S. R.
May W. H .
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