Stepper motor control

Details Stepper motor control Stepper motor control

1982-07-02

1984-08-28

Dobeck, B.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02K 2902

Patent

active

044686013

ABSTRACT:
An improvement in the operation of a system where the driving means is a stepper motor comprises provision of a special software routine implemented by a microprocessor controlling the delivery of a counted series of pulses to drive the stepper motor. The improved routine removes excitation from the stepper motor when not receiving a series of stepping pulses thus eliminating the heat dissipation of such a motor when not in motion. Loss of position is avoided by utilizing the inherent detenting action of the stepper motor's permanent magnet field. Provision is also made for proper damping to prevent error due to overshoot. Where several stepper motors are used in a system the reduction of heat dissipation permits a significant simplification of the system cooling requirements. A single power supply may be shared among the motors thus further simplifying the system.

REFERENCES:
patent: 4147968 (1979-04-01), Goble
Second Int. Conf. on Small and Special Electrical Machines, Sep. 22-24, 1981, R. Whitaker et al., p. 46, "Microprocessor Control of a Step Motor with Various Inertia Loads".
Hughes et al., "Electromagnetic Damping in Stepping Motors", Proc. IEEE, vol. 122, No. 8, Aug. 1975, p. 819.

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