Motor driving apparatus

Details Motor driving apparatus Motor driving apparatus

1985-03-26

1987-01-20

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

046382356

ABSTRACT:
A stepper motor driving apparatus drives a stepper motor with first and second stator windings inductively connected at one end. A power source section is coupled at one end to a chopper transistor coupled to the node of the windings. The first and second stator windings are connected at the other end to a current sensing resistor through two switching transistors, and also coupled to the inverting terminal of a comparator. Two back-to-back diodes are connected between the other ends of the first and second stator windings. The comparator compares the current detected by the current sensing resistor with a first reference value. As long as the chopper transistor is off, it compares a second reference value slightly less than half the first reference value with the current detected by the current sensing resistor. The chopper transistor is turned on and off in accordance with the result of the comparison performed by the comparator, so that the difference between the detected current and the first or second reference value may be reduced.

REFERENCES:
patent: 4535294 (1985-08-01), Ericksen et al.

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