Posts

Showing posts with the label EEE 301: Electrical Machines

A single-phase, induction motor has stator windings in space quadrature and is supplied with a single- phase voltage of 200 V at 50 Hz. The standstill impedance of the main winding is (5.2 +j10.1) ohm and of the auxiliary winding is (19.7 +j14.2) ohm. Find the value of capacitance to be inserted in the auxiliary winding for maximum starting torque.

Image
Question: A single-phase, induction motor has stator windings in space quadrature and is supplied with a single- phase voltage of 200 V at 50 Hz. The standstill impedance of the main winding is (5.2 +j10.1) ohm and of the auxiliary winding is (19.7 +j14.2) ohm. Find the value of capacitance to be inserted in the auxiliary winding for maximum starting torque. Answer:
Post a Comment
Read more

5. A4-pole, 3-phase, 50 Hz induction motor has a voltage between slip-rings on open-circuit of 520 V. The star-connected rotor has a standstill reactance and resistance of 2.0 and 0.4 ohm. per phase respectively. Determine: (a) the full-load torque if full-load speed is 1,425 r.p.m. (b) the ratio of starting torque to full-load torque (c) the additional rotor resistance required to give maximum torque at standstill.

Image
 5. A4-pole, 3-phase, 50 Hz induction motor has a voltage between slip-rings on open-circuit of 520 V. The star-connected rotor has a standstill reactance and resistance of 2.0 and 0.4 ohm. per phase respectively. Determine: (a) the full-load torque if full-load speed is 1,425 r.p.m. (b) the ratio of starting torque to full-load torque (c) the additional rotor resistance required to give maximum torque at standstill.
Post a Comment
Read more