Method and/or apparatus for controlling the motor speed of...

Details Method and/or apparatus for controlling the motor speed of... Method and/or apparatus for controlling the motor speed of...

G - Physics

01

R

318/98

G01R 21/06 (2006.01)

Patent

CA 1288464

ABSTRACT METHOD AND APPARATUS FOR CONTROLLING AN ELECTRIC A.C. MOTOR This application discloses a method and apparatus for controlling both the motor terminal voltage and motor terminal current to vary in exact proportion as the motor shaft torque varies for any given excitation frequency. This obviates the need for ancillary motor speed control and prevents voltage boosting at low speeds from resulting in excessive motor losses for no load conditions. A motor is powered from an inverter, the inverter providing an output voltage with independent control of amplitude and frequency. A frequency signal is fed directly to the inverter from a frequency input, the frequency input also being connected to a multiplier. The multiplier provides the amplitude signal for the inverter based on the product of the input frequency and motor current.

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