Apparatus for dividing the step angle of a stepping motor

Electricity: motive power systems – Open-loop stepping motor control systems

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G05B 1940

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active

042976251

ABSTRACT:
Apparatus for electronically dividing the primary step of a stepping motor to provide an increased number of steps per revolution of the motor. Integrated circuit counters operate in an incremental or decremental mode to sequentially access data words in a sine memory and a cosine memory. Digital-to-analog converters apply the digital data words of the sine and cosine memories to operate phase power transitors and to thereby generate corresponding amplitude changes in the controlled driving current of two associated active phase windings of the stepping motor. An incrementally increasing controlled current signal is applied to one activated phase winding and a corresponding incrementally decreasing controlled current signal is applied to the other of the activated phase windings to smoothly step the motor in angular increments corresponding to the increasing or decreasing amplitudes of current, as defined by the data words of the sine and cosine memories. A voltage boost circuit is employed to apply increased voltage to an active phase winding if increasing current is being applied to the winding.

REFERENCES:
patent: 3885210 (1975-05-01), Burnett
patent: 4087732 (1978-05-01), Pritchard
patent: 4091316 (1978-05-01), Friedman
patent: 4100471 (1978-07-01), Pritchard
patent: 4121145 (1978-10-01), Talmadge
patent: 4140955 (1979-02-01), Drabing
patent: 4145644 (1979-03-01), Liu
patent: 4151449 (1979-04-01), Takahashi

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