Draw and explain the block diagram for speed control of an Induction machine by slip power control. ( A- =|三 四 !!!
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- Explain different methods of speed control of induction motor drive.An 8-pole DC shunt generator with 772 wave-connected armature conductors and running at 500 rpm supplies a load of 10 Ω resistance at a terminal voltage of 230V.The armature and the shunt field resistances are 0.25 Ω and 230 Ω respectively. Find the armature current, induced emf and flux per pole for this machine. [Answer of this question should accompany equivalent circuit diagram ]Objectives: To perform the speed control test on slip ring induction motor by rotor resistance control method. Plot the motor speed characteristics at different values of applied resistance in slip ring of induction motor. Can you explain what happened here? (image below)
- what should be the transition time from Star connection to Triangle connection, explain the change according to engine power and no-load operation.Write the answer using clear explanations, details and diagrams:A load is attached to a synchronous motor. What will happen when the load is changed on this motor? As the synchronous motor requires adjusting field current, what effects does a change in field current have on the synchronous motor? Explain the effects of the changing parameters with the proper phasor diagram.Question 12 The following sequential statements, when completed, describe armature reaction in a DC generator. Complete each statement by inserting the appropriate word from among those provided in the word list below. Word list:armature, between, brushes, clockwise, commutator, currents, direction, distortion, increase, induces, inline, interpoles, main-field, neutral-plane, power, rotating, rotation, slip-rings, slow-down, sparking, speed, torque, voltage. Armature reaction is the __________________ of the air gap flux that results from the interaction of the magnetic field created by _________________ in the armature conductors with uniform magnetic field of the __________________ winding. Armature reaction results in pole tip saturation and a shift in the ________________, which lies ________________ the main field poles at no-load. In generators this shift in the neutral plane is in the direction of _________________. The effects of armature reaction can be reduced by equipping…
- Explain No load test or rotational loss test and Blocked rotor test.The following information is given for a 300 kw, 600 V long shunt compound generator. Shunt field resistance = 75 Ω, armature resistance including brush resistance = 0.03 Ω, commutating field winding resistance = 0.011 Ω, series field resistance = 0.012 Ω, diverter resistance = 0.036 Ω. When the machine is delivering full load, calculate the voltage, power generated by the armature and efficiency.When an induction motor is started directly from the line, the starting torque is 1.75 times full load torque. What will the motor starting torque in terms of full-load value, when the machine is started by the Y-A method? Answer: 1.0103 TFL