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Article

Unbalanced Magnetic Pull in Three-phase Electric Motors

  • November 2021
  • Number of views: 9195
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Tom Bishop, P.E.
EASA Senior Technical Support Specialist

Although unbalanced magnetic pull can affect other rotating electric machines such as DC motors and generators and single-phase motors and generators, our focus in this article will be on three-phase squirrel cage induction motors. The two main topics are unbalanced magnetic pull (UMP) and rotor pullover. For clarity we will begin by defining and briefly explaining these terms.

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

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

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 13: Motor Alignment, Vibration & Noise

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 13: Motor Alignment, Vibration & Noise

Root Cause Failure Analysis
Mechanical Repair Fundamentals of Electric Motors
  • Section 12: Vibration & Motor Geometry

Tags: Rotor pullover Air gap Unbalanced magnetic pull
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