Explain the braking methods of induction motors by giving their torque-speed characteristics
Explain the braking methods of induction motors by giving their torque-speed characteristics
Explain the effect of rotor resistance on starting torque and speed in induction motors and draw typical curves of torque versus speed for 1x, 2x, 4x, and 8x of rotor resistance?
The figure below shows the characteristics of 4 designs of induction motors. When comparing breakdown torque, we can say that 300 Design D 250 Design C 200 Design A- Percent of rated torque 150 Design B 100 Speed Sync Speed Design B has a higher breakdown torque that Design A Design C has a higher breakdown torque that Design B Design C has a higher breakdown torque that Design A Design A has a higher breakdown torque that Design B
Please explain the no-load characteristics for shunt and separately excited DC motors. How will rotor speed, armature current and field current be effected for both at no load?
9) Sketch the torque speed curve for a typical induction motor. Label the synchronous speed (N) rated torque (TR) rated speed (NR)
Below shows a graph of speed vs torque characteristic of a
3-phase induction motor. Describe how the induction motor speed
varies as the motor torque increases.
Graph of Speed vs Torque Characteristic Torque (N.m) 0 2 00 400 600 1000 1200 1400 1600 800 Speed (r/min)
A 3-phase 50Hz 2-pole 440V (L-L rms) induction motor drive has a rated speed of 2955 rpm and rated torque of 35 Nm. This motor drives a load with a torque characteristic that increases linearly with speed such that it equals the load torque at the rated speed. It draws a current of 2.1 A(rms) per phase at the rated voltage at a power factor of 0.81 (lagging). The stator resistance Rs = 2.0 ohms. At the rated operating speed,...
(b) Explain why starting torque and running torque are different in three phase induction motor. (2 marks)
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t(slip) % of the Peak Torque Floalslip) Slightly reduced operating speed, but double the operating slip 2001000 100 200 slip) % of the Starting Torque We can influence its torque production...
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3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t (slip) fslip) load slip) of the Peak Torque Slightly reduced operating speed, but double the operating slip 200 -200 100...
(b) (i) Explain briefly why an induction motor can never run at synchronous speed? (2 Marks) (ii) If a six-pole induction motor supplied by a three-phase 50 Hz supply has a rotor frequency of 2.3 Hz, Calculate: (a)The percentage slip (b)The speed of the rotor in rpm (4 Marks) (iii)Draw a typical torque versus slip characteristic curve of an induction motor. If rotor resistance is increased show how the new torque versus slip curve deviates from the original one. (4...