Assertion: armature | /r/HasProperty | engineered for rated maximum rpm
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text: They are engineered for a rated maximum rpm, and if that is exceeded (e.g. a motor runaway where the shunt winding loses power while the motor is unloaded), the wedges on some slots may fail, allowing the copper winding wire to exit the slots up into the air gap between the rotor and the field pole pieces while the rotor is spinning at high speed.