Control of stepper motor
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United States of America Patent
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-
May 11, 1999
Grant Date -
N/A
app pub date -
Dec 8, 1995
filing date -
Dec 9, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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