Motor Drive Power Systems Interactions
ISBN: 978-1-4244-6096-0
Year Published: 1997
Pages: 130
Variable speed ac drives using a PWM controlled induction motor fed from a constant voltage dc link circuit have matured as a standard drive technology for a wide range of industrial applications.
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Variable speed ac drives using a PWM controlled induction motor fed from a constant voltage dc link circuit have matured as a standard drive technology for a wide range of industrial applications. In this system, the amount of energy stored in the dc link capacitor is relatively small. When the supply of power is interrupted, the dc link energy is absorbed by the motor load within a few milliseconds. Since the electronic control system loses power as well, the inverter must be shut down by an undervoltage protection scheme in order to avoid ill-defined operating conditions and possible damage to the power semiconductors. The machine gets deenergized, but continues rotating for some more time owing to the inertia of the mechanical system.
