What is polyphase induction machine performance, Electrical Engineering

Assignment Help:

Q. What is Polyphase Induction Machine Performance?

Some of the important steady-state performance characteristics of a polyphase induction motor include the variation of current, speed, and losses as the load-torque requirements change, and the starting and maximum torque. Performance calculations can be made from the equivalent circuit. All calculations can be made on a per-phase basis, assuming balanced operation of the machine. Total quantities can be obtained by using an appropriate multiplying factor.

The equivalent circuit of Figure (c), redrawn for convenience in Figure, is usually employed for the analysis. The core losses, most of which occur in the stator, as well as friction, windage, and stray-load losses, are included in the efficiency calculations. The power- flow diagram for an induction motor is given in Figure, in which m1 is the number of stator phases, φ1 is the power factor angle between ¯V1 and ¯I1, φ2 is the power factor angle between ¯E1 and ¯I2, T is the internal electromagnetic torque developed, ωs is the synchronous angular velocity inmechanical radians per second, and ωm is the actualmechanical rotor speed given by ωs (1-S). The total power Pg transferred across the air gap from the stator is the difference between the electric power input Pi and the stator copper loss. Pg is thus the total rotor input power, which is dissipated in the resistance R2'/S of each phase so that

1094_What is Polyphase Induction Machine Performance.png

Subtracting the total rotor copper loss, which is m1(I'2)2 R'2 or SP8, from Equation for Pg, we get the internal mechanical power developed,


Related Discussions:- What is polyphase induction machine performance

Main difference between a latch and a flip flop, Question: a) What is ...

Question: a) What is the main difference between a latch and a flip flop? b) Draw the logic diagram of an SR-latch using only NAND gates. c) A positive edge triggered

Cma complement accumulator instruction, CMA Complement Accumulator  Instru...

CMA Complement Accumulator  Instruction Complement the  contents of the accumulator  i e the   accumulator  al once are converted zeros  and all zeros  are converted to  ones.

Non inverting summing amplifier, Q. In the non inverting summing amplifier ...

Q. In the non inverting summing amplifier of Figure, let R d = 1k and M = 6. Find R f so that v =

Explain keyboard interfacing to 8088 through 8279, Explain keyboard interfa...

Explain keyboard interfacing to 8088 through 8279 . The 8279 is a programmable keyboard and display interfacing component which scans and encodes up to a 64-key keyboard and con

Solid state devices, what are the significance of solid state devices in el...

what are the significance of solid state devices in electrical engineering

find the sending end voltage and current, A 3-phase transmission line is 2...

A 3-phase transmission line is 200km long. The line has a per phase series impedance of 0.25+j0.45 Φ/km and shunt admittance of j7.2ΦS/km. The line delivers 250MVA, at 0.6 lagging

Can you explain honorarium?, Can you explain Honorarium? Ans: Honora...

Can you explain Honorarium? Ans: Honorarium is a remuneration for work performed which is intermittent or occasional in character and either so laborious or of such special

Transformer-coupled amplifiers, Q. Transformer-coupled Amplifiers? Tra...

Q. Transformer-coupled Amplifiers? Transformer-coupled Amplifiers: The figure illustrates another type of coupling often used to couple audio frequencies - the untuned transf

Determine the peak fundamental component of the mmf, Q. A two-pole, three-p...

Q. A two-pole, three-phase synchronous generator has a balanced three-phase winding with 15 turns per phase. If the three-phase currents are given by i a = 100 cos 377t, i b =

Electricity, Describe the nature of electricity

Describe the nature of electricity

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd