Consider a separately-excited DC motor with an armature resistance RA=0.25 2 and terminal voltage VT 150 V. The motor rated speed is 1800 RPM. The field winding supply VF=36 V and the field resistance i: adjustable. The motor has compensating windings and interpoles. IF (A) EA (V) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 30 60 85 102 115 124 130 134 These values were taken at speed n=1800 RPM If the motor is driving a load at rated armature current IA = 46 A, with Radi RF=90 S2. Find the speed of rotation ofthe motor in RPM. Select one: O a. None Ob. Speedn= 2444 RPM O. Speed n = 1326 RPM K d. Speed n= 1800 RPM

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Q: Discuss the advantages of flux weakening operating regime in a DC motor.

A:

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.