Method and apparatus for eliminating ripple component from motor

Details Method and apparatus for eliminating ripple component from motor Method and apparatus for eliminating ripple component from motor

1976-08-27

1981-08-11

Witkowski, S. J.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318331, 318621, 318622, G05B 500, H02P 500, H02P 700

Patent

active

042836654

ABSTRACT:
In a motor control circuit, a rotational speed detection signal containing a ripple component superimposed on a d.c. component is applied to both a low pass filter/phase lagging circuit and to a phase leading circuit, the output signals of which have a phase difference of approximately 180 degrees, to effectively cancel the ripple component and thereby extract only the d.c. component. The latter is balanced against an r.p.m. reference voltage in a comparison circuit whose output is fed back to a drive winding control circuit of the motor.

REFERENCES:
patent: 2751548 (1956-06-01), Gunderson
patent: 2892164 (1959-06-01), Woll
patent: 3474346 (1969-10-01), Schaefer
patent: 3518519 (1970-06-01), Callan
patent: 3551780 (1970-12-01), Gautherin
patent: 3600663 (1971-08-01), Wagner
patent: 3761741 (1973-09-01), Hoeft

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