Driving device for a stepping motor

Details Driving device for a stepping motor Driving device for a stepping motor

1986-09-26

1988-03-29

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

G05B 1940

Patent

active

047346329

ABSTRACT:
A driving device for a stepping motor wherein detection of a position of the rotor of a stepping motor can be effected accurately without the necessity of adjustments of various elements. The device detects a current flow in a field winding of an energized phase and compares it with a simulated saturation curve to detect a back EMF induced in the winding to find a current position of the rotor of the motor.
The simulated saturation curve is produced by energizing the winding with a low voltage, measuring current flows in the winding as voltage signals at three different points of time, and calculating several data indicating a saturation curve from the voltage signals. The data are stored in memory and recalled one after another to produce a corresponding voltage when the field winding is energized.

REFERENCES:
patent: 4446413 (1984-05-01), Remur et al.
patent: 4480218 (1984-10-01), Hair

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