Method and/or apparatus for controlling the motor speed of an el

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

1988-05-10

1989-11-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

048810223

ABSTRACT:
A method and apparatus is shown to control both the 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.

REFERENCES:
patent: 3909687 (1975-09-01), Abbondanti
patent: 3989991 (1967-11-01), Brennen

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