Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
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.
Botsch Sr. Bradley J.
Masih Karen
Motorola Inc.
Shoop Jr. William M.
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