Which field control method for a DC series motor involves shunting a portion of motor current around the series field to reduce the field flux and increase the speed of the motor? 

Explanation:

• The field diverter method is a field control technique employed in DC series motors to regulate their speed. DC series motors have a field winding connected in series with the armature.
• In the field diverter method, a diverter or shunt resistor is connected in parallel with the series field winding.
• By doing so, a portion of the motor current is diverted away from the series field, reducing the overall field current and, consequently, the field flux.
• Reducing the field flux in a DC series motor leads to a decrease in the counter electromotive force (back EMF) generated by the motor. With a reduced back EMF, the motor can achieve higher speeds, making this method suitable for speed control applications. The diverter resistor serves as a path for the diverted current, allowing the motor to operate efficiently at different speeds.