Step motor velocity control

Details Step motor velocity control Step motor velocity control

G - Physics

05

B

318/18

G05B 19/40 (2006.01) H02P 8/14 (2006.01)

Patent

CA 1081315

STEP MOTOR VELOCITY CONTROL ABSTRACT OF THE DISCLOSURE A drive control system for a stepping motor having an optical disk sensor on the rotor shaft. A binary counter counts output pulses from a clock running much raster than the, maximum speed expected from the optical disk. Optically- generated pulses, synchronized with the counted pulses, transfer the count from the counter into a storage register and reset the counter. The count achieved by the counter is inversely proportional to the velocity of the rotor shaft. More pulses and a higher count means a lower shaft speed. Therefore, the contents of the register is a coded measure of shaft speed. A code converter is used to determine the power input to the stepping motor to maintain a desired shaft speed. Therefore, the higher the motor speed and the lower the counter output between successive optically gen- erated pulses, the less power is delivered to the stepping motor coils. -1-

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