We have a specification of PM synchronous motor driven by VFD. The motor spec requires external inductance about 20 microHenry. Our understanding was that this inductance is required to reduce dv/dt of PWM voltage pulses, thus reducing a stress applied to motor insulation, reducing accelerated insulation aging effect, and optimize a service life. However, the motor MFG states that this additional inductance is required to reduce rotor overheating. Is this true? Unfortunately, the motor MFG (outside of USA) would not provide further explanation.
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