Feedback circuitry for D.C. motor speed control

Details Feedback circuitry for D.C. motor speed control Feedback circuitry for D.C. motor speed control

1987-04-08

1989-07-25

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388901, 388907, 388910, 388917, 388921, H02P 516

Patent

active

048517445

ABSTRACT:
A circuit for controlling the speed of a DC motor provides delay and sampling means in the feedback loop to delay the triggering of the SCRs driving the DC motor and measured the motor armature voltage during the period of the delay, thereby eliminating errors in the armature motor voltage caused by the SCR motor excitation.
Alternatively, the current to the motor is measured to generate a pulse output for initiating an interval during which the measured armature voltage is sampled and transmitted to a summator for generating an error signal controlling application of power to the DC motor whereupon the aforesaid interval is terminated upon receiving a pulse indicative of power application to the DC motor.

REFERENCES:
patent: 3553551 (1969-05-01), Arnold
patent: 3950682 (1976-04-01), Dohanich, Jr.
patent: 4096422 (1978-06-01), Fleming et al.
patent: 4153863 (1979-05-01), Schachte et al.
patent: 4288729 (1981-09-01), Anzai et al.
patent: 4390826 (1983-06-01), Erdman et al.
patent: 4586121 (1986-04-01), Gilliam
patent: 4636935 (1987-01-01), Tschernenko et al.

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