In a WRIM, the rotor winding is made of many turns of insulated wire and is connected to slip rings on the motor shaft. An external resistor or other control devices can be connected in the rotor circuit. Resistors allow control of the motor speed, although significant power is dissipated in the external resistance. A converter can be fed from the rotor circuit and return the slip-frequency power that would otherwise be wasted back into the power system through an inverter or separate motor-generator. COUNT 4
QSN1 Where might a resistor be attached? ANS1 rotor circuit QSN2 What can a resistor control? ANS2 motor speed QSN3 How might wasted power be salvaged? ANS3 inverter or separate motor-generator QSN4 From where may a converter be fed? ANS4 rotor circuit