Title: Flux corrective control apparatus for motor drives

Abstract: A direct current motor control apparatus includes corrective circuit for eliminating the influence of non-linearities on speed regulation as a result of load variations. A summer circuit at the input of the speed regulator algebraically combines signals representing respectively the armature current and voltage to derive a signal representing the counter-electromotive force of the motor. The latter signal is compared in the summer circuit with a signal representing motor speed for supplying a corrective error signal to the speed regulator, thereby to keep the air gap flux constant and provide a speed-load characteristic which is linear in relation to the armature current drop.

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Inventors: Harris, Walter R. (Williamsville, NY, US)

Application Number: 546849
Filing Date: 1975-02-03
Publication_date: 1977-09-13
Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
Primary Class(es): 388/806 318/521, 318/532, 388/902, 388/917
Other Classes:
US Patent Ref:

3569809	Mar, 1971	Comer	318/338.
3735220	May, 1973	Renner et al.	318/493.
3735226	May, 1973	Pittner	318/338.
3811079	May, 1974	Tashiro et al.	318/338.
3887855	Jun, 1975	Klimo	318/338.

Other Refs:
Primary Examiner: Dobeck, B.
Assistant Examiner:
Attorney: Lorin; C. M.