Stepper motor shaft position sensor

Details Stepper motor shaft position sensor Stepper motor shaft position sensor

1987-08-31

1988-12-13

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 368 66, 368 80, H02P 800

Patent

active

047913436

ABSTRACT:
A stepper motor shaft position sensor differentiates the current provided when the stepper motor is excited as by a step command voltage. The differentiated current is, in effect, a signature indicative of whether or not the motor shaft has taken a step. If the differentiated current falls below a predetermined level within a predetermined interval the motor shaft has taken a step as indicated by a sensor output at a predetermined logic level. Otherwise, the sensor output is at another predetermined logic level indicating that a step has not been taken and the motor is in a stalled condition. The sensor output is applied to a utilizing means which provides a continuous verification of the steppper motor shaft position.

REFERENCES:
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patent: 4216648 (1980-08-01), Maire
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patent: 4422040 (1983-12-01), Raider et al.
patent: 4551665 (1985-11-01), Antognini et al.
Step Motors and Control Systems, Kuo, p. 283, 1979.

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