Calculate the induction motor efficiency, Mechanical Engineering


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
Calculate the maximum and minimum stress: A cast iron column of 200 mm diameter carries a vertical load of 400 kN, at a distance of 50 mm from the centre. Calculate the maximu

Determine contact reactions and force: Figure given below shows a sphere resting in smooth V shaped groove and subjected to a spring force. The spring is compressed to

what are the necessity of lubrication ?

Two shafts A and B are co-axial. A gear C (50 teeth) is rigidly mounted on shaft A. A compound gear D-E gears with C and an internal gear G. D has 20 teeth and gears with C and E h

Due Diligent:   There are many literatures on sand blasting and manufacturing processes. Historically, sand blasting had been used for many tasks before. It was pretty famous

Case study entitled " Exxon Valdez Oil Spill Disaster ". 1.      Examine the aim and objectives of Exxon Mobil Corporation. 2.      Carefully observe the oil and refinery ind

Transmission System: In a two-wheeler, the transmission system means the whole arrangement that transmits the power from the engine crankshaft to the rear wheel.

Problem You are playing tetherball because you are seven years old and you have nothing better to do.  If the tetherball has a mass of 1 kg and the rope is 1.5 m long and can w

1.5kw/ton of refrigeration is required to maintain temp of -40c in the refrigerator.if the cycle works on carnot cycle.determine 1.cop,2.sink temp 3. heat rejejected to the sink/to

Ask question explin opiz code #Minimum 100 words accepted#