Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1974-05-07
1976-07-27
Dobeck, B.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318318, 318327, H02P 500
Patent
active
039719740
ABSTRACT:
A controlling apparatus adapted to drive a D.C. motor at a constant speed in synchronization with an external reference signal. In order to detect rotational speed of the D.C. motor, a tachogenerator is provided, and means for generating a reference signal is also provided. A comparator circuit is provided to compare a frequency signal from the tachogenerator with a reference frequency signal from the reference signal generation means. A current controlling semi-conductor, which is turned ON or OFF by an output from the comparator circuit, is connected in series with the D.C. motor and the power source. With this arrangement, a voltage applied to the D.C. motor may be varied in response to conduction and non-conduction of the current controlling semi-conductor to enable the D.C. motor to initiate self-starting and to be driven at a constant speed synchronously with a reference signal after it has reached its synchronous speed.
REFERENCES:
patent: 2809339 (1957-10-01), Guggi
patent: 3079539 (1963-02-01), Guerth
patent: 3192461 (1965-06-01), Hohne, Jr.
patent: 3382423 (1968-05-01), Clark
patent: 3577057 (1971-05-01), Dyer
patent: 3812410 (1974-05-01), Schaub et al.
Canon Kabushiki Kaisha
Dobeck B.
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