Phase locked stepper motor controlled light chopper

Details Phase locked stepper motor controlled light chopper Phase locked stepper motor controlled light chopper

1985-04-25

1986-12-23

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

046314660

ABSTRACT:
A phase locked loop stepper motor controlled light chopper for providing a specific pattern reversal rate. The stepper motor controlled light chopper includes a phase comparator for comparing the phase of a reference signal to the phase of a comparison signal; a RC low pass filter for filtering the output of the phase comparator; a voltage controlled oscillator having a frequency varying in response to the output of the RC filter. The chopper also includes a binary counter for generating count signals responsive to the frequency of the voltage controlled oscillator; a divide by 10 circuit counting one of the outputs of the binary counter and providing the comparison signal. The light chopper also includes a memory circuit for storing an eight state four bit gray code for driving a four phase stepper motor as a chopper wheel in a specified pattern mounted on a drive shaft.

REFERENCES:
patent: 3435213 (1969-03-01), Colbow et al.
patent: 4145644 (1979-03-01), Lin
patent: 4272712 (1981-06-01), Beling et al.
patent: 4523224 (1985-06-01), Longacre, Jr.

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