Three-phase induction motors are widely used in various industrial applications due to their robustness, reliability, and efficiency. Chopper control resistance is one of the methods used to control the speed of these motors. In this method, a chopper circuit is used to vary the resistance in the rotor circuit of the motor, which changes the rotor current and hence the torque and speed of the motor.


In a three-phase induction motor, the torque is proportional to the rotor current. When the chopper circuit is used to control the resistance in the rotor circuit, the rotor current is varied, which changes the torque produced by the motor. The higher the rotor current, the higher the torque produced by the motor.


The chopper control resistance method can be used to vary the torque of the motor by changing the resistance in the rotor circuit. When the resistance is increased, the rotor current decreases, which reduces the torque produced by the motor. Conversely, when the resistance is decreased, the rotor current increases, which increases the torque produced by the motor.


The chopper control resistance method has several advantages over other methods of speed control in three-phase induction motors, such as:

• Simple and cost-effective


• Provides smooth and stepless speed control


• Reduces power consumption and improves efficiency


• Provides high starting torque

In conclusion, the torque produced by a three-phase induction motor with chopper control resistance is proportional to the rotor current. The chopper control resistance method can be used to vary the torque of the motor by changing the resistance in the rotor circuit, and it has several advantages over other methods of speed control.