Stepper motor control circuit and apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 7, 1989
Grant Date -
N/A
app pub date -
Oct 7, 1987
filing date -
Oct 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a motor control circuit for a stepper motor which causes a motor shaft to oscillate between an incremental rotational position nearest above and nearest below a commanded average rotational position identified by an electrical command signal. A clock is provided for sending periodic clock signal pulses to the control circuit. An up/down counter is connected to the clock for counting clock pulses on each clock cycle and for providing an output signal in the form of a binary representation of total clock pulses. A comparing circuit electrically connected to the up/down counter is used to control an up/down direction of the up/down counter before each clock signal pulse so that the up/down counter causes the motor shaft to rotate to a position nearest beyond the commanded shaft position and to thereafter oscillate between an incremental count nearest above and an incremental count nearest below the commanded average rotational position. The invention provides the benefit of greater average shaft position resolution and, additionally, because oscillation is provided, the present invention is particularly useful in the electrical positioning of valve spools or variable displacement pumps in a manner which reduces the possibility of spool sticking.
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