Control for a stepper motor or other synchronous motor

Details Control for a stepper motor or other synchronous motor Control for a stepper motor or other synchronous motor

1986-05-12

1987-10-13

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

G05B 1940

Patent

active

047001208

ABSTRACT:
Closed loop control for a stepper motor or other synchronous motor. A digital/frequency interface provides drive current to the motor at a frequency determined by output of speed limiter. Required rate-of-change of speed is calculated and applied via rate-of-change limiter to adder which sums rate-of-change signal with existing speed signal. The required rate-of-change is calculated by a calculator in accordance with existing speed, remaining distance to run, and the predetermined rate-of-change signal, to ensure that motor is brought to rest in controlled fashion without overshoot which normally occurs in closed loop control with rate-of-change limitation.

REFERENCES:
patent: 4025837 (1977-05-01), Meier et al.
patent: 4126821 (1978-11-01), Cannon

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