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Energy Efficiency Improvement with Permanent Magnet Motors and Variable-Frequency Drives

Jan 01, 2013

In the induction motor, slip frequency (i.e., the frequency difference between stator rotating flux and mechanical rotating speed) induces current in the rotor windings. The interaction between rotating magnetic field and induced rotor current produces a driving force, but the motor current causes copper loss (calculated as I2R) that decreases motor efficiency.

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