Drive circuit for a stepping motor control device

Details Drive circuit for a stepping motor control device Drive circuit for a stepping motor control device

1988-10-07

1990-03-06

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

049069101

ABSTRACT:
A pulse motor control apparatus for a polyphase excitation type pulse motor variably and independently controls excitation currents supplied to excitation coils. Ratios of any excitation current to other excitation currents supplied to the excitation coils are changed stepwise to rotate a composite magnetic field vector forward by those excitation coils each multiple of a real number of a predetermined unit angle at one time for controlling the rotational angle of a rotor of the pulse vector. The pulse motor control apparatus assures fine control for the rotational angle of the rotor compared with prior cases where currents supplied to a plurality of excitation coils are switched on and off for rotational control. Application of the present control apparatus to printers, etc., precludes replacement of gears, etc., due to types of print heads mounted thereon. Additional advantages such as inprovement of a torque ripple upon driving the pulse motor assure extensive application to various fields.

REFERENCES:
patent: 3750000 (1973-07-01), Bruckner et al.
patent: 4107593 (1978-08-01), Anderson
patent: 4336484 (1982-06-01), Marinko
patent: 4358725 (1982-11-01), Brendemuehl
patent: 4431955 (1984-02-01), Faedi et al.
patent: 4769585 (1988-09-01), Tanuma et al.

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