Method and apparatus for starting an electric motor

Electricity: motive power systems – Induction motor systems – Primary circuit control

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Details

318798815-, 318432, 318453, 318479, H02P 126

Patent

active

057173052

ABSTRACT:
A method and apparatus for controlling an AC motor are described wherein a frequency generator is configured to generate a signal representative of the stator electrical frequency and to estimate the rotor electrical frequency of the motor during operation. The generator operates on torque and flux current reference signals and on d-axis voltage reference and feedback signals to determine the electrical frequencies. The generator ramps up gain values applied to the torque current reference signals and to a voltage error signals representative of the difference between the d-axis voltage reference and feedback signals during a startup phase of operation to enhance performance and stability of the drive during this phase. The generator includes feedforward and feedback portions that contribute components of the final stator frequency signal. The components are filtered differently during startup and running phases of operation to provide the desired frequency signals.

REFERENCES:
patent: 5479081 (1995-12-01), Seibel et al.

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