Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1987-05-15
1990-06-12
Shoop, Jr., William M.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388812, 388810, 388912, 318608, H02P 500
Patent
active
049339850
ABSTRACT:
A rotation drive device for driving a rotator is disclosed, comprising an electric motor for driving the rotator, a phase detecting circuit for detecting the phase of rotation of the rotator, a reference signal source for forming a reference signal of a constant period, a phase control circuit for controlling the motor in such a manner that the phase difference between the output of the reference signal source and the output of the phase detecting circuit becomes a constant value, a detecting circuit for detecting a fact that the reading-out of the phase difference is not completed in the time interval between the successive two outputs of the phase detecting circuit, a control circuit for varying the number of cycles of phase difference computing operation of the phase control circuit depending on the time interval between the successive two outputs of the phase detecting circuit, another detecting circuit for detecting a fact that the phase detecting circuit has produced no output in one period of the reference signal, and another detecting circuit for detecting a fact that the production of an output of the phase detecting circuit has repeated a plurality of times in one period of the reference signal.
REFERENCES:
patent: 4254367 (1981-03-01), Sakamoto
patent: 4259698 (1981-03-01), Takada
patent: 4283671 (1981-08-01), Nakano et al.
patent: 4287458 (1981-09-01), Nakamura et al.
patent: 4301395 (1981-11-01), Furuhata
patent: 4418307 (1983-11-01), Hoffman et al.
patent: 4564795 (1986-01-01), Parkes et al.
patent: 4658191 (1987-04-01), Okita et al.
Canon Kabushiki Kaisha
Martin David
Shoop Jr. William M.
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