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What device has to be added for running three phase 5 HP motor from the available single phase source?

What device has to be added for running three phase 5 HP motor from the available single phase source? Correct Answer Inverter/UPS

3-phase power from a single-phase source
Several relatively simple and inexpensive alternatives exist to provide 3-phase power where only single-phase service is available. These alternatives include:

  • • Static 3-phase Converter
  • • Rotary 3-phase Converter
  • • Digital 3-phase Converter
  • • Variable Frequency Drive (VFD)

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Variable Frequency Drive (VFD) (Inverter/UPS)

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                                                                                   Fig: Schematic of Variable Frequency Drive

  • A Variable Frequency Drive (VFD or VSD or electronic 3-phase inverter) changes single-phase power into direct current and then inverts the direct current to 3-phase power.
  • This is done using electronic controls to simulate 3-phase alternating current.
  • The electronics in the converter allow control of motor speed, torque and direction of rotation, and often allow for a soft start to bring the motor up to speed gradually.
  • Since it must be programmed, a VFD typically is dedicated to running only one motor.
  • VFDs can be more affordable than rotary converters for lower horsepower motors, however above 10 HP the savings starts declining

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