H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/101
H02P 25/14 (2006.01)
Patent
CA 1067140
Abstract of the Disclosure The present invention comprises speed control systems ant methods for universal-type electric motors. A typical motor speed control system according to the present invention includes a power modulator circuit, for example a controlled bridge rectifier circuit, for controlling the power supplied to the motor. A current transformer or a resistor provides a voltage which is directly proportional to the instantaneous motor terminal current. A potentiometer connected to the current transformer and a resistor connected to the potentiometer tap provides a sensing current which is directly proportional to the voltage across the current transformer, ant thus to the instantaneous motor terminal current. A potentiometer connected to the motor and a resistor connected to the potentiometer tap provides a sensing current which is directly proportional to the instant- aneous motor terminal voltage. A summing amplifier algebraically sums the instantaneous values of the two sensing currents and an integrating amplifier averages the sum of the instantaneous values. A feedback circuit generates a signal for operating the controlled bridge rectifier, the signal having a phase determined by the output of the integrating amplifier, whereby the output of the integrating amplifier controls the phase of the controlled bridge rectifier and thereby controls the power supplied to the motor.
272656
Brigham Young University
Na
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