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  5. Motor Diagnosis & Rewinding

Motor Diagnosis & Rewinding

Three-phase motor faults — windings, bearings and the supply problems that destroy otherwise healthy machines. Most burnt-out motors were killed by something outside them, so these guides diagnose the installation as well as the machine, and set out honestly when a rewind is worth it and when it is not.

Winding failure andinsulation…1 guideSingle-phasing and supplyfaults1 guideBearing failure andmechanical…1 guideOverload protection andduty1 guideVariable-speed driveinteraction1 guideRepair, rewind or replace1 guideMotor
Fault domains for Motor. Solid outline means a published guide covers that domain; dashed means the guide is not yet written. 6 of 6 covered.

What this covers

  • ▪Winding failure and insulation testing — Three-Phase Motor Failure
  • ▪Single-phasing and supply faults — Three-Phase Motor Failure
  • ▪Bearing failure and mechanical causes — Motor Bearing Failure
  • ▪Overload protection and duty — Motor Overload Keeps Tripping
  • ▪Variable-speed drive interaction — VFD Tripping
  • ▪Repair, rewind or replace — Three-Phase Motor Failure

Diagnosis guides

  • Three-Phase Motor Failure — Diagnosis, and Whether to Repair or Rewind

    Three-phase squirrel-cage induction motors on direct-on-line, star-delta, soft-start and variable-speed drives

    9 diagnostic steps · advanced · qualified electrician

  • Motor Overload Keeps Tripping — Diagnosis

    Three-phase motors on direct-on-line, star-delta and soft-start control, with thermal or electronic overload protection

    8 diagnostic steps · intermediate · qualified electrician

  • Motor Bearing Failure — Noise, Heat and Knowing When to Stop

    Three-phase squirrel-cage induction motors, foot and flange mounted, direct-on-line and drive-fed, driving pumps, fans, compressors and conveyors

    8 diagnostic steps · intermediate · technician

Related guides

Filed under another category, but they cover part of the scope above.

  • VFD Tripping — Reading Drive Faults and Finding the Real Cause

    in Industrial Electronics & Drives · 9 diagnostic steps

Want us to do the work?

These guides are written so you can diagnose the fault yourself. If you would rather an engineer handled it, our mobile workshop covers all 47 counties.

Motor Diagnosis & Rewinding servicesTalk to an engineer

Related categories

  • Industrial Electronics & Drives
  • Pump Diagnosis & Repair
  • Test Instruments & Measurement