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