Stepper motor control that adjusts to motor loading

Details Stepper motor control that adjusts to motor loading Stepper motor control that adjusts to motor loading

1998-09-21

2000-01-11

Masih, Karen

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318648, 318649, 318585, 318654, G05B 1940

Patent

active

060139994

ABSTRACT:
A system and method are provided for controlling a stepper motor having a rotor and a multi-phase stator. Sinusoidal command signals define a commanded position of the motor's rotor. An actual position of the rotor is sensed as a function of an electrical angle between the actual position and the commanded position. The actual position is defined by sinusoidal position signals. An adjustment signal is generated using the sinusoidal command signals and sinusoidal position signals. The adjustment signal is defined as a function of the cosine of the electrical angle. The adjustment signal is multiplied by each sinusoidal command signal to generate a corresponding set of excitation signals, each of which is applied to a corresponding phase of the multi-phase stator.

REFERENCES:
patent: 3984748 (1976-10-01), Sullivan
Power-Conserving Stepping-Motor Drive Circuits, United States National Aeronautics and Space Administration Tech Briefs, Jul. 1994, p. 30, vol. 18 #7, Associated Business Publications Co., NY,NY.
Simpler Power-Conserving Stepping-Motor Drive Circuit, United States National Aeronautics and Space Administration Tech Briefs, Mar. 1997, p. 6b, vol. 21 No. 3, Associated Business Publications Co., NY, NY.

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