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Trade press article — Plant Engineering

Considerations for using VFDs with standard motors

  • December 2016
  • Number of views: 12933
  • Article rating:

By Mike Howell
EASA Technical Support Specialist

Motors that meet the requirements of NEMA: MG1 Part 31 are designed for use with variable-frequency drives (VFDs). Motors that meet the requirements of NEMA: MG1 Part 30 may be suitable for inverter duty if appropriate measures are taken such as line conditioning. End users desiring speed and/or torque control often procure and install VFDs to modify existing applications where a standard-induction motor is in place. Frequently, they try to control costs by using the existing motor. There are a few areas of concern involving misapplication of a standard induction motor.

Topics covered include:

  • Speed-torque characteristics
  • Shaft currents
  • Installation

READ THE ARTICLE



EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines
  • Section 5: Electronics

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards

Tags: Variable frequency drives Shaft currents Motor controls
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