Control of stepper motor

Details Control of stepper motor Control of stepper motor

1995-12-08

1999-05-11

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P8/00

Patent

active

059031263

ABSTRACT:
The present invention relates to a method and a circuit arrangement for controlling a stepper motor, e.g. in a panoramic X-ray apparatus. In the method of the invention, the control data of a processor (5) is first converted into an analog signal with a digital-analog converter (6), and the signal thus obtained is integrated with an integrating circuit (7,10), whereafter the signal is converted into pulses controlling the stepper motor (9) with a voltage-frequency converter (8). The circuit arrangement comprises preferably one or two integrators. In consequence, the changes in the speed of rotation of the stepper motor can be made stepless, whereby the stresses directed at the mobile parts are small, and mechanical oscillation caused by high momentary forces is avoided. In addition, the loading of the processor can be made uniform. Error correction circuits employing feedback are employed to enhance operation of the invention.

REFERENCES:
patent: 3719878 (1973-03-01), Ferguson et al.
patent: 4349771 (1982-09-01), Buxton
patent: 4420717 (1983-12-01), Wallace et al.
patent: 4587473 (1986-05-01), Turvey
patent: 4929879 (1990-05-01), Wright et al.

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