A 240-V, star connected, three phase, synchronous motor has a synchronous reactance of 4-ohm/phase and negligible armature winding reactance. At a certain load the motor takes 7.20-kW at 0.866 pf lag. Determine: (i)The phase voltage (Va)[V] (ii)The per-phase complex current (Ia)[A]  (iii)The per-phase complex induced excitation voltage (Ea)[V]

Q: 4. The synchronous reactance of a synchronous motor is 102 per phase and its armature resistance is…

A: Synchronous reactance Input power Induced voltage Terminal voltage

Q: [62.3A, 0.82, 44.7A] age of 120 V between the slip rings on s reactance of 10 per phase at…

A: The solution is given below

Q: Sketch the V curve for a synchronous motor. Label the axes. Indicate where the power factor is…

A: The plots of armature current Ia versus field current If are called V curves. The V curves represent…

Q: a- Which of the following is/are a general class of single-phase split-phase motor? a…

A: 1) the general class of single-phase split-phase motor are  Resistance Start induction-run…

Q: A certain 60Hz, four-pole split-phase induction motor spins at 1760rpm when running with no torque…

A:

Q: 2.. A three-phase 60 Hz asynchronous motor runs at 890 rpm at idle and 840 rpm at full load. ww w w…

A: Frequency f= 60Hz Speed 890rpm at idle  Find the number of poles Slip at nominal speed  What happed…

Q: Explain the conditions for parallel operation of synchronous generators. A three phase, wye…

A: An alternator/Synchronous generator is a type of electrical machine that converts mechanical energy…

Q: E) power factor of the motor? a) improves b) get poorer c) remains the same d) none of the above

A: One individual question is to be answered. E) In a three phase induction motor, when there is no…

Q: In general, which of the following is/are a factor that will determine the synchronous speed of a…

A: This question is from "Electrical Engineering". Under which we are going to study the factors over…

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.