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locked rotor on repulsion motor

locked rotor on repulsion motor

locked rotor on repulsion motor

(OP)
Hi:

I have an older 3hp repulsion motor.  Whem starting it, with or without load, the rotor locks.  When I give it slight push, it works normal.  I checked the armature and the 4 brushes and they were clean.  Since the brushes are movable, I tried them in different positions to no avail.  The winding on the rotor looks normal with no discoloration.

Thanks in advance for your input,

Windbug      

RE: locked rotor on repulsion motor

Either a shorted commutator, shorted windings or a shorting bracelet hanging up in the shorting position may cause similar symptoms. Check the linkage on the shorting bracelet first.
respectfully

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