Frequency sensitive resistor starting style wound rotor induction motor manual direction switching circuit

Published:2011/7/5 9:51:00 Author:John | Keyword: Frequency sensitive resistor, wound rotor, induction motor | From:SeekIC

The figure shows a manual-start reversible circuit. The forward starting button STF is pressed and another pair of normally closed contacts of STF disconnect. So the reverse coil KMR loop is cut. At this time, the forward KMF coil pulls and the wound rotor motor is connected with frequency sensitive resistor L in series. It is at the starting state and its speed gradually increases. When the speed rises to about 70% of rated speed, press the running button SN is pressed to lead the KM3 to coil and be self-protected. And the frequency sensitive resistor is shorted. The motor runs into full-voltage operation. When the process is completed, press the STP to park. Similarly, press the button STR and the motor will start to start on the reverse. Press the SN for running into the full-voltage operation state.



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