Explain working of single-phase induction motors, Electrical Engineering

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.

Posted Date: 6/28/2013 2:13:54 AM | Location : United States







Related Discussions:- Explain working of single-phase induction motors, Assignment Help, Ask Question on Explain working of single-phase induction motors, Get Answer, Expert's Help, Explain working of single-phase induction motors Discussions

Write discussion on Explain working of single-phase induction motors
Your posts are moderated
Related Questions
Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected

find the net value of power if an average value of energy is assumed to be $0.05/KWh, the capacity value is $30/kw-yr ...

3. Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+. The cylinde

Basically,8086 is separated into two part. 1. BIU. 2. EU Execution Unit(EU)Fetch the instruction from Queue(memory(6 byte) in BIU.) and implement it.

Q. Show Maximum Power Transfer? In order to investigate the power transfer between a practical source and a load connected to it, let us consider Figure , in which a constant v

Impurities in Semiconductors Can be added in accurately controlled amounts. Can modify the electronic and optical properties. Used to change conductivity over wide ra

The one line diagram of a simple three phase power system is shown in figure below. Each generator is represented by an emf behind the transient reactance. All impedances are expre

Give the properties of PVC. PVC- It is acquired from polymerisation of hydrogen chloride and acetylene in the presence of a catalyst as peroxides at about 50 0 C. Properties

ERC and KPI The company requires understanding the strategic and nearing term impact of the Regulator's orders / tariff approval process. Once these dimensions are understood,

Wiring a Plug : Let us consider the problem of connecting a 16 A plug, commonly known as 15 A or power plug to an electrical appliance. Do you use any old bit of wire, or any