An active front end (AFE rectifier) suitable for the PowerFlex 7000 80026-044-03 topology is also commonly called a PWM rectifier. This is particularly attractive for applications with new motors since it does not require an isolation transformer to meet IEEE-519.

Most available technologies in today’s MV market require a multi-winding transformer to mitigate the unwanted harmonics through cancellation by phase shifting the transformer secondary windings. Depending on the topology, the transformer can have up to 15 sets of secondary windings.

The PowerFlex 7000 80026-044-03 achieves near sinusoidal current and voltage waveforms to the motor, resulting in no significant additional heating or insulation stress. Temperature rise in the motor connected to the VFD is typically 3 °C (37 °F) higher compared to across the line operation. Dv/dt in the voltage waveform is less than 10 volts / microsecond.

The peak voltage that the motor insulation will see is the rated motor RMS voltage divided by 0.707. Reflected wave and dv/dt issues often associated with VSI (voltage source inverter) drives are a non-issue with the PowerFlex 7000.  

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