A 2300-V, 1100 HP, 0.8-PF leading, 60-Hz, two-pole, Y-connected synchronous motor has a synchronous reactance of 2.5 N and an armature resistance of 0.3 Q. At 60 Hz, its friction and windage losses are 40 KW, and its core losses are 20 KW. This machine is operating at rated conditions, and its copper losses is estimated as 8 % of its input power. What is the efficiency of this motor? Select one: O a. None b. %n = 85.7 % c. %n = 92.65 % d. %n = 81.6 % e. %n = 77.28 %

Q: A 480-V, 100-kW, 50-Hz, four-pole, Y-connected synchronous motor has a rated power factor of 0.85…

A: It is given that:

Q: 2. A 480 V, 100 kW, 50 Hz, four pole, Y connected synchronous motor has a rated power factor of 0.85…

A: It is given that:

Q: a dc shunt motor runs at 900 r.p.m from a 460 V supply when taking an armature current of 25 A.…

A: Take the ratio of back emfs to find the speed at terminal voltage of 230 volts. Back emf is directly…

Q: An 8 pole DC shunt generator with 900 wave-connected armature conductors supplies 10ohm  at 500 V…

A: To find the answers, we can use the following formulas and calculations:1.1 The flux per pole:The…

Q: 3. A 4 pole, 250 dc shunt motor has a lap connected armature with 960 conductors. The flux per pole…

A: The solution can be achieved as follows.

Q: Assume that a separately excited shunt de machine has a rated terminal voltage of 230 V and a rated…

A: We got an a separately excited shunt dc machine with, Terminal Voltage (Vt) = 230 V Armature current…

Q: In a spinning industry, a 215 V, 4 pole shunt motor runs at a speed of 1300 rpm gives an output of 8…

A: In this question we will find dc shunt motor torque , flux etc...

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: A separately-excited DC motor has lap-wound armature with 100 slots and 2 turns per coil. It is…

A:

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.