Calculate the induction motor efficiency, Mechanical Engineering

Question:

Characterisation tests have been performed on a four pole, 415 V (line to line), three phase, star connected, 50Hz induction motor, with the following results:

  • No-load test : 415Vl-l, 3.76A, 234.3 W/phase.

(obtained at synchronous speed with a drive motor supplying the rotational losses of the drive system)

  • Locked rotor test: 163.8 Vl-l, 30A, 603 W/phase.

a)  Draw the per phase approximate equivalent circuit model of the induction motor, with all elements "stator-referred". Identify the physical significance of each element in the model.

b)  Using the characterisation data, calculate the "stator-referred" induction motor parameters. Assume that the shunt elements are much larger than the series terms. Remember that the measured input voltages are "line-to-line", not phase voltages.

c)  A load test is performed on the induction motor, which is fed from a 415Vl-l 50Hz supply, and the rotor speed is measured to be 1410rpm. Calculate the output mechanical power and mechanical torque for this test if the rotational losses constitute 880W for this condition. [Hint : Assume that the stator and rotor winding resistances are split equally].

d)  Calculate the induction motor efficiency for the load test described in (c).

e)  It is required to run the induction motor at a no-load zero slip speed of 900 rpm. Neglecting rotational losses, what must the supply voltage and frequency be in order to achieve this speed?

Posted Date: 2/18/2013 2:43:17 AM | Location : United States







Related Discussions:- Calculate the induction motor efficiency, Assignment Help, Ask Question on Calculate the induction motor efficiency, Get Answer, Expert's Help, Calculate the induction motor efficiency Discussions

Write discussion on Calculate the induction motor efficiency
Your posts are moderated
Related Questions

Superheate d Steam: When the dry saturated steam is heated further at constant pressure, the temperature of it rises up above the saturation temperature. This rise in tempera

Hi there. I am stuck on a problem. I am working out the section of 2 beams for the floor of an elevator. Thus far the critical conditions are made up of a beam that is 1.8m long

Initial structure and requirements: In the evening after the panel, various interested parties gathered in a smoke-filled room and asked themselves if a common translator was

The main objective is to compute the maximum efficiency of the solar cell panels, produce hydrogen and estimate the hydrogen production rate using solar cells and electrolyzer and

The Make Group of Euler Operators The Make group consists of four operators for adding some elements into the existing model creating a new one, and a Make-Kill operator for ad

High Speed Circuit : The speed of motorcycle is further increased by raising the throttle valve. In this condition, fuel and air enter through main passage and main jet as can be

Cam: This is an integral part of camshaft. A cam is designed in such a way as to open or close the valves at the correct timing and keep them open for the necessary duration.

test test teste teste teste tester

Combustion Chamber ( or Clearance Volume ) : Combustion chamber is a space between the cylinder head and the piston top when the piston is at top dead center (TDC). The combustio