A DC shunt motor drives a centrifugal pump at a speed of 1000 rpm when the...

A DC shunt motor drives a centrifugal pump at a speed of 1000 rpm when the terminal voltage and line currents are 200 V and 50 A, respectively. Given the armature resistance, Ra = 0.1 ohm and field resistance, Rf =100 ohm. Design a circuit which the speed of the motor can be controlled by using the added resistance method to the armature circuit and the maximum starting current is 120 A. Next, if the added resistance in the designed circuit above can be adjusted so that the speed is 800 – 900 rpm, analyze the minimum and maximum values of the resistance should be adjusted in the armature circuit. Then, design a circuit which the terminal voltage can be adjusted so that a conveyor can be operated at speed 745.46 rpm.

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Manojponduru answered 1 year ago

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