Question
Download Solution PDFIn the field flux control method of DC motor speed control, ___________ power and ___________ torque is obtained for speeds above base speed.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 4):(constant, variable)
Concept:
In the field flux control method of DC motor speed control, constant power and variable torque are obtained for speeds above base speed.
The figure shows a field diverter circuit which is used for speed control of the DC motor In this method, a low-value resistance (diverter) is connected across the field as shown in the figure A variable resistor connected in parallel with the series-wound field to control speed is called a diverter
By adjusting the diverter resistance, any desired amount of current can be passed through the diverter, so the flux can be decreased, and the speed of the motor is increased In this method, the speed can be controlled only above normal speed
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