Closed loop stepper motor circuitry without encoder

Details Closed loop stepper motor circuitry without encoder Closed loop stepper motor circuitry without encoder

1979-10-29

1981-03-10

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318721, G05B 1940

Patent

active

042556937

ABSTRACT:
Stepper motor control circuitry including a phase locked loop circuit formed by a phase detector outputted to a filter and a voltage controlled triangular and square wave generator which has a frequency control input terminal connected to the output of the filter and which provides a square wave on an output thereof connected as an input to the phase detector. An oscillator drives the phase detector, and the outputs of the generator are connected as inputs to a pulse width modulated driver which has its outputs connected to the coils of the stepper motor. A differential amplifier is connected across one of the coils of the motor, and a balanced modulator synchronous detector or multiplier has two inputs one of which constitutes an output of the differential amplifier and the other of which is a connection to the square wave output of the generator. The output of the multiplier constitutes an error signal which is supplied to a summing junction between the filter and generator so that, upon the application of an instantaneous load to the stepper motor, the error signal causes a very quick return to normal speed of the motor.

REFERENCES:
patent: 3601678 (1971-08-01), Vestal et al.
patent: 3660747 (1972-05-01), Kruer et al.
patent: 3684934 (1972-08-01), Loyzim
patent: 4065708 (1977-12-01), Ulland et al.
patent: 4119901 (1978-10-01), Leenhouts
A. C. Leenhouts et al., "An Active Stabilization Technique for Open Loop PM Step Motor Drive Systems", May 24-27, 1977, from Proceedings Sixth Annual Symposium, University of Illinois.
G. Singh, "On Current Detection in Variable Reluctance Step Motors", May 24-27, 1977, from Proceedings Sixth Annual Symposium, University of Illinois.

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