Determine the number of poles, the slip, and the frequency of the rotor currents at rated load foi three-phase, induction motors rated at: 220V, 50HZ, 1440r/min.
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- using internet of things (IoT) in speed control of athree-phase induction Motor.Discuss the double field revolving theory and discuss the equivalent circuit diagram of single phase induction motorThe rotor resistance and reactance of a squirrel-cage induction motor rotor atstandstill are 0.14 ohm per phase and 0.8 ohm per phase respectively. Assuminga transformer ratio of unity, from the eight-pole stator having a phase voltage of254 at 60 Hz to the rotor secondary, calculate the followingA. rotor starting current per phase.B. the value of slip producing maximum torque.
- A 3 phase, star connected synchronous generator supplies current of 10A having phase angle of 20º lagging at 400V. Find the load angle and the components of armature current Id and Iq if Xd = 10 ohm and Xq = 6.5 ohm Assume armature resistances to be negligibleA long shunt compound DC generator delivers a load current of 150A at 230V and has armature, series field and shunt field resistances of 0.032, 0.015 and 92Ωrespectively. Calculate (i) induced emf (ii) total power generated and (iii) distribution of this power (iv) voltage regulationDraw voltage phasor diagrams for different load cases of salient synchronous generators and derive the expression of the induced voltage.
- A 100KVA, 6.6 kV 3 PHASE star connected cylindrical pole synchronous generator has 20-ohm as synchronous reactance and the armature resistance is negligible and the generator is working at the full load and unity power factor then find the value of the induced emf voltage(line to line). Answer fasta) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulationA 25kVA, 3-phase, wye connected, the 400-V synchronous generator has a synchronous reactance of 1.6 per phase. The generator is to have zero voltage regulation at full-load. Neglecting the armature resistance, find the operating power factor and the developed power.
- IV. What are the various losses in an induction motor? On what actors do they depend?A lap wound dc generator having 50slots with 15conductors per slot generated at no led emf of 400v when running at 1000 rpm suppose if the same generator is desired to genate 220v on open circuit. Suggest the speed at which it has to be rotatedAnalyse the reason behind the positive and negative torques produced by three phase synchronous motor.