The thin winding in a shunt motor is used to reduce the amount of current flowing through the motor. This helps to reduce the amount of heat generated in the motor, which in turn helps to increase the efficiency of the motor. The thin winding also helps to reduce the amount of voltage drop across the motor, which helps to reduce the amount of power lost in the motor. In comparison, the thicker winding in a series motor is used to increase the amount of current flowing through the motor, which helps to increase the torque output of the motor.
