Step motor exciting apparatus

Details Step motor exciting apparatus Step motor exciting apparatus

1982-10-20

1984-12-25

Truhe, J. V.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02K 2904

Patent

active

044906641

ABSTRACT:
An apparatus for exciting a step motor such as a step motor employed as a drive source for conveying original documents in a reading device such as a facsimile system. To vary the feed pitch in the auxiliary scanning direction of the original, staircase waveform exciting currents are applied through A-phase and B-phase exciting coils of the step motor. The apparatus of the invention provides for equal step sizes of the two waveforms and waveforms which are precise complements of one another. Currents flowing in the two exciting coils are sensed and voltages representing the sensed currents are divided in ratios determined by division ratio control signals read from a ROM. The divided signals are compared with a reference signal to provide pulse drive signals of constant currents during each step.

REFERENCES:
patent: 4336484 (1982-06-01), Marinko

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