Determine the full load voltage regulation, Electrical Engineering

A 3 phase 60 hertz induction motor has 8 poles and operates with a slip of .05 for a certain load. Compute in r.p.m. the (a)speed of the rotor with respect to the stator, (b)speed of the rotor with respect to the stator magnetic field, (c)speed of the rotor magnetic field with respect to the rotor, (d)speed of the rotor magnetic field with respect to the stator, (e) speed of the rotor field with respect to the stator field.

A 3 phase, 6 pole induction motor is rated at 400hz, 150v, 10h.p., 3% slip at rated power output. The windage and friction loss is 200w at rated speed. With the motor operating at rated voltage, frequency, slip, and power output, determine (a) rotor speed, (b) frequency of rotor current, (c) rotor copper losses, (d) power crossing the air gap, (e) output torque.

A 25KVA, 3 phase, wye-connected, 400v synchronous generator has a synchronous impedance of 0.05 +j1.6 ohms per phase. Determine the full load voltage regulation at (a) 0.8 power factor lagging, (b) unity power factor, (c) 0.8 power factor leading.

A 500KVA, 6 pole, 500v, 3 phase, wye-connected synchronous generator has a synchronous impedance of 0.1 + j1.5 ohms per phase. If the generator is driven at 1000 r.p.m., what is the frequency of the generated voltage? Determine the excitation voltage and the power angle on full load and 0.8 lagging power factor.

A synchronous motor is operated at rated load and unity power factor. The field current is increased by 20%. Show the resulting changes in all voltage and current phasors on a phasor diagram.

Posted Date: 3/11/2013 5:52:34 AM | Location : United States







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