Method and/or apparatus for controlling the motor speed of an electric AC motor and/or a method of determining torque
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United States of America Patent
Stats
-
Nov 14, 1989
Issued Date -
N/A
app pub date -
May 10, 1988
filing date -
Mar 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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