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

Carrying out repairs on lt and ht switch gear, Precautions to be taken in c...

Precautions to be taken in carrying out repairs on HT and LT switch gear? Ans: The following precautions to be taken in carrying out repairs on LT and HT switch gears. a

Simulink connection, I can,t connect a new subsystem of solar module with a...

I can,t connect a new subsystem of solar module with a capacitor and inductor why and how to solve

Calculate the frequencies at which there is an alias, A pure sine wave alon...

A pure sine wave along with a frequency of 100Hz is sampled at 150Hz. At which point one of the subsequent frequencies would you expect an alias? A) 75Hz B) 100Hz C) 150Hz

Microprocessor, I would like to know if you can help me with the attached m...

I would like to know if you can help me with the attached microprocessor assignments my email address is . also let me how much in cost in $US

Simulation of a standard ic linear regulator, 1.    Introduction The ob...

1.    Introduction The objective of this assignment is to design and evaluate a stabilised discrete linear power supply. The power supply requires to be designed according to t

Automatic irrigation system on running solar power b, how to upload the pro...

how to upload the program on proteus soft ware by using personal computer?

Explain rotameter and hot wire anemometer, Write down about the following t...

Write down about the following terms: (i) Pirani Gauge (ii) Rotameter (iii) Hot wire Anemometer (iv) Drag Force Flow Meter

Silicon Photonics, How does a Mach-Zehnder Modulator work in Silicon?

How does a Mach-Zehnder Modulator work in Silicon?

Explain dielectric current, Dielectric: Insulator that is used among th...

Dielectric: Insulator that is used among the two plates of a capacitance is called as dielectric.  Electric field exists in the dielectric and the flux density depends on th

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