Electricity: motive power systems – Linear-movement motors
Patent
1975-07-10
1977-08-02
Duggan, Donovan F.
Electricity: motive power systems
Linear-movement motors
318227, 318230, 318231, H02K 4100
Patent
active
040399079
ABSTRACT:
A control circuit is provided for a linear induction motor to control motor thrust in relation to a reference thrust. An analog circuit, or computer, is supplied signals representative of the voltage and current to the motor. This analog circuit includes circuit elements simulating the stator or primary resistance of the motor, and it develops a control signal proportional to the power delivered to the motor less the copper losses in the primary resistance. This control signal is proportional to motor thrust if magnetizing losses and secondary resistance losses are ignored. A reference thrust signal is compared with this control signal, and the error between these two signals is used to control the firing angles of controlled rectifiers in a controlled rectifier bridge network supplying power to the motor. By this control loop the power supplied to the motor is regulated to control the thrust instantaneously developed in relation to a reference thrust.
REFERENCES:
patent: 3387197 (1968-06-01), Paulus
patent: 3441823 (1969-04-01), Schlabach
patent: 3525100 (1970-08-01), Duff
patent: 3549966 (1970-12-01), Wilson
patent: 3611089 (1971-10-01), Mokrytzki
patent: 3619749 (1971-11-01), Schieman
patent: 3619750 (1971-11-01), Mokrytzki
patent: 3719869 (1973-03-01), Coho
patent: 3735219 (1973-05-01), Kahn et al.
patent: 3775652 (1973-11-01), Bowler et al.
Gupta Prabodh Chandra
Marsh Arthur H.
Duggan Donovan F.
Mayer Robert T.
Otis Elevator Company
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