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The use of frequency inverter enables a continuous control of the motor speed and provides constant torque in the whole speed range.
The rating for variable speed induction motors need to be selected based on the following aspects:
While variable speed drives provide highest energy saving for variable torque (Centrifugal pump, fan) applications, for constant torque and constant power application, Variable speed drives offer significant process control improvements. Basic inverters permit operation over a typical 20:1 speed range. With closed loop vector control the effective range may be increased to 1000:1.
The main International Standards that deal with this subject are:
IEC: 60034-17 - Rotating Electrical Machines - Part 17: Cage induction motors when fed from converters.
IEC 60034-25 - Rotating Electrical Machines - Part 25: Guide for the design and performance of cage induction motors specifically designed for converter supply
Main Features of inverter duty motor: