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3- Briefly explain the duty of commutation and brushes in DC motors by considering the working principle of DC motors. D
Posted: Fri Jul 01, 2022 5:59 am
by answerhappygod
- 3 Briefly Explain The Duty Of Commutation And Brushes In Dc Motors By Considering The Working Principle Of Dc Motors D 1 (30.82 KiB) Viewed 40 times
3- Briefly explain the duty of commutation and brushes in DC motors by considering the working principle of DC motors. Draw the equivalent circuit of the series DC motor. Derive the torque-speed equation and sketch the torque-speed graph. Why are these motors used in high-torque applications? What will happen if mechanical load is disconnected from shaft? 100 V series DC motor has an armature resistance of 0.75 Q and series field resistance of 0.25 0. In one loading condition, the motor consumes 20 A, and the speed of the motor is 1000 rpm. The loading decreases and current consumption becomes 10 A. Find the new speed of the machine (Assume that B-H curve is linear and armature reaction is neglected.) How do we increase the speed of shunt DC motor by adjusting the field resistance? Briefly explain step by step. Explain the advantages and the disadvantages of permanent magnet DC motors.