speed control of slipring motor
Posted 16 August 2003 - 04:36 AM
THANKS IN ADVANCE.
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Posted 16 August 2003 - 10:13 PM
Variation in the value of the resistance in the rotor circuit of a slip ring motor, alters the motor torque curve. Essentially, the slip of maximum torque increases with increasing resistance. If you have a constant torque load, you can use this as a means of controlling the speed of the motor. If the load torque varies, the speed will alter with the load torque variation. Consider that the resistors control the torque of the motor, not the speed.
Additionally, there is considerable slip los when operating at 10% speed. This power loss is dissipated in the rotor resistors, so I expect that the pony motor solution is a good one in that the speed will be constant and the efficiency will be much higher.
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