Stepper motor controllers

Details Stepper motor controllers Stepper motor controllers

1991-05-03

1993-04-27

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

052065715

ABSTRACT:
A driver for a stepper motor including means (Q45, 45, 47, 402) for sampling the current in a motor winding (43) at an instant determined by means (401, 400)for generating a predetermined delay following winding commutation. The sample is compared with winding current by a comparator (403) the output of which is stored at a subsequent instant in a flip-flop (416) to provide an output (42). Current generated within the windings due to rotor motion provide a difference in output when the motor is running or blocked. The invention provides a solution to the problem of motion detection of a stepper motor without recourse to a positional sensor.

REFERENCES:
patent: 4658194 (1987-04-01), Richter et al.
patent: 4734632 (1988-03-01), Kamikura et al.
patent: 4775902 (1988-10-01), Trovato et al.

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