A 120-volt separately-excited DC motor has armature resistance Ra = 0.2 ohms and shunt field resistance Rf = 100 ohms. When rated voltage is applied, the armature current is 100 amperes and the motor speed is 3600 rpm. With the field current maintained constant, the applied voltage is reduced to 100 volts and the new armature current becomes 50 amperes. Neglecting saturation effects, what will be the new operating speed for this motor? Express your answer in RPM. a. 3600 RPM O b. 3000 RPM O c. 2400 RPM O d. None of these are correct. e. 1800 RPM

Q: A 500V shunt motor runs at its normal speed of 10 rev/s when the armature current is 120A. The…

A:

Q: Needs Complete solution with 100 % accuracy.

A: The objective of the question is to calculate the input power to a DC series motor powered by a…

Q: A 230V DC series motor operates at its full load current and speed of 22A and 750 revolutions per…

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Q: he current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is ?

A: Given: Terminal voltage, V = 230 V. Armature resistance, Ra=0.5 Ω. Back emf, Eb=200 V.

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A: Given Data:A PMDC motor with,Electrical constant Armature resistance Input DC voltage To…

Q: Consider a shunt DC motor with an armature resistance RA=0.2 ohm and terminal voltage VT = 160 V.…

A: Given Data: VT = 160 V Ra = 0.2 ohm Ia = 60 A N = 1517 rpm Ploss = 848 Watt

Q: Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately…

A: Given Vph=150 Vra=0.2 Ωkb=0.4N=750 rpmI0=40 A

Q: A 1200 rpm, 700V Series DC motor has an armature resistance of 20 and the field resistance of 90. If…

A: Efficiency = output power/ input power. Total losses = cupper loss + rotational losses.

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.