jul 18, 2020 in wound rotor motors, the rotor is wound with wire similar to the stator, with their terminal ends connected to 3 slip rings on the output shaft. these slip rings are attached to brushes and variable power resistor banks, where operators can change the speed of the motor by varying the resistance through the rotor coils.
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jim mckee (deceased) alabama electric motor service sheffield, alabama technical education committee member the slip ring or wound rotor induction motor (wrim) has been used in a variety of applications. many of these applications use the wrim s high starting torque capabil ity while limiting current to start and run very high inertia loads such as hammer mills, rolling mills, centri fuges
the rotor lead connection to a slip ring. when inspecting a wound rotor motor and the rotor lead is the point of failure, the transient caused by a rapid restrike is a strong contender for the root cause of the failure. if it was not caused by an operator tapping the button,