Using the equivalent circuit of a separately excited DC motor, illustrate what affects the speed of such a motor.
A 28 V separately excited motor has the following specifications:
Armature resistance = 0.5 ohms
Voltage constant = 0.7 V/rad/s,
Torque constant = 100 Nm/s
Field current = 10 mA
Calculate the speed when the developed torque is 10 Nm.
Demonstrate how the torque of the motor can be increased without reducing the speed. (5 marks)
Infer from the results you have obtained from Q1a, explain how speed control can be achieved in a permanent magnet brushed DC motor.
Compare the advantages and disadvantages of using brushless DC permanent magnet motors with using permanent magnet brush DC motor in drones.
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Distinguish between AC synchronous motor and AC induction motor with reference to their speed, torque, advantages, and disadvantages.
Figure Q2(b) shows an equivalent circuit of a 3 phase 8 pole 115 V 400 Hz aircraft induction motor. Interpret the equivalent circuit and explain how Rm affects the performance of the motor.
For the motor in Figure Q2(b), given that Xs = 0.24 ohm, Rs = 3.5 ohm, Xi’ = 0.6 ohm, Rr = 0.5 ohm, Xm = 16 ohm and there is negligible core losses. The motor speed at full load is 5850 rpm. Demonstrate how you would calculate Q2c(i) to Q2c(v).
The synchronous speed.
The stator current and power factor.
The stator copper loss.
The rotor copper loss.
Appraise with justifications whether the above motor is suitable for the following applications stated in Q2d(i) to Q2d(iii).
Flux gate compasses synchronizer.
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The post EAS305 Using the equivalent circuit of a separately excited DC motor, illustrate what affects the speed of such a motor: Aircraft Electrical, Instrument Systems/Servomechanisms and Electronics Course Work, SUSS, Singapore appeared first on Singapore Assignment Help.