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SPM Synchronous Motor Protection & Control

The SPM controls starting, synchronizing, and protection of collector-ring or brushless type synchronous motors.


  • Collector-ring synchronous motors

Protection & Control

  • Field application
  • PF regulation maximizes efficiency
  • Reluctance torque synchronizing
  • Re-synchronizing
  • DC field current loss
  • DC field voltage check
  • Incomplete sequence
  • Field winding overtemperature
  • Power factor (pull-out)
  • Stall/acceleration
  • Restart lockout

Technical Documents


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