Step motor velocity control

Details Step motor velocity control Step motor velocity control

1977-01-24

1978-08-15

Hohauser, Herman J.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318254, 318138, G05B 1940

Patent

active

041075943

ABSTRACT:
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 faster 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 generated pulses, the less power is delivered to the stepping motor coils.

REFERENCES:
patent: 3368128 (1968-02-01), Parrish
patent: 3757191 (1973-09-01), Agati et al.
patent: 3777245 (1973-12-01), May
patent: 3816656 (1974-06-01), Ludwig
patent: 3982622 (1976-09-01), Bellino et al.
McSparran et al., Stepper Motor Control System, 3-1974; IBM Technical Disclosure Bulletin; vol. 16, No. 10.

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