Stepping motor drive circuit

Details Stepping motor drive circuit Stepping motor drive circuit

1985-11-22

1987-06-16

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

046738568

ABSTRACT:
A stepping motor drive circuit includes a power source terminal and a reference potential terminal, a plurality of switching transistors, respectively connected between the reference potential terminal and ends of a plurality of excitation coils, for controlling currents flowing through the excitation coils, and a constant current control circuit for setting the currents flowing through the power source terminal and the excitation coils to a constant value. The constant current control circuit includes a first pnp transistor whose emitter is connected to the power source terminal through a first resistor and whose collector is connected to the other end of each of the excitation coils, and a second pnp transistor whose emitter is connected to the power source terminal and whose collector is connected to the reference potential terminal through a second resistor and to a base of the first pnp transistor and whose base is connected to the emitter of the first pnp transistor through a third resistor and to the collector of the first pnp transistor in series through a resistor and a capacitor.

REFERENCES:
patent: 4368414 (1983-01-01), Watanabe et al.

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