Question
Download Solution PDFIf the field of a DC shunt motor is opened while running, what will happen to the speed?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFIn a DC shunt motor, \({E_b} \propto N\phi\)
For a constant back emf, flux is inversely proportional to the speed of the motor.
If field winding is disconnected accidentally, the speed would dangerously increase in order to maintain the back emf of the motor. For a constant back emf, flux is inversely proportional to the speed of the motor.
In the case of a series machine if field winding disconnected, then the motor circuit is open and no current will pass through the armature, for the operation of machine interaction of two fluxes is necessary thus the machine won't operate.
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