- The speed control of the Slip ring induction motor by chopper is shown in the figure A.
- The ON and OFF time of chopper is adjusted in order to get desirable speed of the motor.
- The three phase rectifier converts AC into DC.
- The copper losses are very high due to high content of harmonics at the output of the rectifier.
- The function of the inductor is to reduce ripple at the output of the rectifier.
- When chopper CH is ON, the resistance R2 is short circuited. Similarly when the chopper CH is OFF, the external resistance is equal to R1 + R2.
- The average external resistance can vary by switching chopper.
Effective external resistance =
R1 ( TON
) + ( R1 + R2 )( TON + TOFF ) / ( TON
+ TOFF )
- The speed of the slipring induction motor depends upon rotor resistance.
- The high speed operation of motor is obtained by low rotor resistance and vice versa.
- The speed of the motor can be changed by ON – OFF control of chopper.
- The transistor is used as switching device for low power, GTO for medium power and SCR for high power requirement in the chopper circuit.
Very insightful post.
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