Explain working of single-phase induction motors, Electrical Engineering

Assignment Help:

Q. Explain working of Single-Phase Induction Motors?

For reasons of simplicity and cost, a single-phase power supply is universally preferred for fractional-horsepower motors. It is also used widely for motors up to about 5 hp. Single-phase induction motors are usually two-pole or four-pole, rated at 2 hp or less, while slower and larger motors can be manufactured for special purposes. Single-phase induction motors are widely used in domestic appliances and for a very large number of low-power drives in industry. The single - phase induction machine resembles a small, three-phase, squirrel-cage motor, except that at full speed only a single winding on the stator is usually excited.

The single-phase stator winding is distributed in slots so as to produce an approximately sinusoidal space distribution of mmf. Such a motor inherently has no starting torque. it must be started by an auxiliary winding, by being displaced in phase position from the main winding, or by some similar device. Once started by auxiliary means, the motor will continue to run. Thus, nearly all single-phase induction motors are actually two-phase motors, with the main winding in the direct axis adapted to carry most or all of the current in operation, and an auxiliary winding in the quadrature axis with a different number of turns adapted to provide the necessary starting torque.

Since the power input in a single-phase circuit pulsates at twice the line frequency, all single - phasemotors have a double-frequency torque component,which causes slight oscillations in rotor speed and imparts vibration to the motor supports. The design must provide a means to prevent this vibration from causing objectionable noise.


Related Discussions:- Explain working of single-phase induction motors

Fourier transform for the function, The far-field pattern of an antenna can...

The far-field pattern of an antenna can be modeled as the two dimensional Fourier Transform of the aperture. 1. Determine the 2D Fourier Transform for the function

1- phase full bridge inverter with r- load , 1- phase  Full Bridge Invert...

1- phase  Full Bridge Inverter with R- Load 1-phase full  bridge inverter with resistive load R i it has  advantage over 1-? half  bridge  inverter that it does  not require

Quality control systems, Give three reasons why a chamfer shouldn't be cons...

Give three reasons why a chamfer shouldn't be considered an "unimportant" dimension. When conducting an audit, what is the first step and what is its purpose? Why will calcul

Explain the suitability of aluminium, Explain the suitability of aluminium ...

Explain the suitability of aluminium  that is used as electrical conducting materials. Aluminium : Conductors are appropriate for ambient and very high temperature. Use of alu

Introduction to electronics, Explain the difference between a microprocesso...

Explain the difference between a microprocessor and an embedded microcontroller

Illustrate frequency-shift keying, Q. Illustrate Frequency-shift keying? ...

Q. Illustrate Frequency-shift keying? Digital transmission by FSK is a nonlinear modulation method that is appropriate for channels that lack the phase stability needed to perf

Ratio, how do ratos connect to engineering

how do ratos connect to engineering

Electrical/electronic engineering project, i need a project creating in ele...

i need a project creating in electronic/electrical engineering at HNC level, 3000 words Harvard referencing. it can be about anything in this field or i can give a suggestion

Digital electronic, What are the advantages of wired-AND connection of digi...

What are the advantages of wired-AND connection of digital IC

Resultant air-gap flux of induction machine, Q. Resultant air-gap flux of i...

Q. Resultant air-gap flux of induction machine? The resultant air-gap flux is produced by the combined mmfs of the stator and rotor currents. For the sake of conceptual and ana

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