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US 4,727,300 AGranted
Motor control method
AssigneeFuji Photo Film Co., Ltd.
InventorsKazuo Horikawa, Yoshiaki Ishino, Takenori Tomita
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Abstract
A signal representing the period between adjacent positive-going edges and the period between adjacent negative-going edges of a pulse train generated by a rotary encoder coupled coaxially to a motor is compared with a reference period signal for the motor to produce a deviation signal. The rotation of the motor is controlled by the deviation signal.
Claims2
A method of controlling a motor coupled coaxially to a rotary encoder, comprising the steps of:
- (a) obtaining a first signal by counting clock pulses based on adjacent positive-going edges of a pulse train generated by said rotary encoder;
- (b) obtaining a second signal by counting clock pulses based on adjacent negative-going edges of the pulse train;
- (c) comparing said first signal with a reference period signal for the motor to produce a first deviation signal;
- (d) comparing said second signal with the reference period signal to produce a second deviation signal;
- and
- (e) controlling the rotation of the motor in accordance with the first and second deviation signals.
3 more elements
Dependencies are inferred from the claim text.