basics of single phase induction motor

In this article is explains, Single phase induction motor basics. A single phase induction motor construction is simple, reliable, low cost to repair and maintain. The application using to a single motor found in the small grinder, centrifugal water pumps ceiling fans, washing machines, etc.


single phase induction motor
Single Phase Induction Motor

Single phase induction motor Construction

The case is one of two main electric motors. and with an asynchronous rotor is determining Stator. As its name indicates a quiescent state as part of an induction motor. A given amount of one time of the time along from one stator induction motor.

The rotor and the rotor rotating part of the motor induction. Unites the rotor shaft go through a mechanical load. One time the rotor by induction squirrel cage rotor type motor. The construction of one of the induction motor, three-time is almost like a squirrel cage induction motor. If the time from one to the induction motor has two stator windings. winding in time of the breach in the tribes in the place. So that time of the induction of the tribe of the motor is will dealt with  Single phase induction motor.

Single Phase Induction Motor Stator

Stator induction motor, which means one more time consuming laminated to reduce losses in the current float periphery. If, however, the openings of the ducts of the principal by means of the parade is to bear, and the founder of the. The silicon steel Stampings reduce hysteresis losses were made. When we speak of one's world and he thinks that it is produced a little lower than the speed of the stator rotating magnetic put on the motor windings of the synchronous speed ns. They act at a different rate from the speed of Ns.

Synchronous Motor speed equation,

Ns =120F/P

F = Frequency, P = Number poles

The Induction of the phase of one of the mover by inducing a Stator, the construction of the phase of the two, but three parts of one the same as the mover of the dissimilarities of the winding part of the induction of a mover.

1. Firstly, the introduction of one-Motors same time provided concentrically with the disc. We can easily adjust the number of turns per coil can, with the help of concentric spherical shells. The MMF distribution sinusoidal near.

2. Apart from the case but shaded-pole motor, an asynchronous motor in the stator windings, winding in the principal, and of course these two kinds of aids to make the crooked serpent his spirit. The distance between the two quadrature coils placed.

Single phase induction motor rotor

The construction of the rotor of one-time for the induction motor is like the squirrel cage induction motor is a three-time. For what is above all things, and He said that of the rotor with a cylindrical shape and the edges of the holes. Locking is made through holes are parallel and a skewed a little to warm Stator magnetic induction and prevents operation of the rotor makes the teeth more smooth and quiet motor, i.e. unconcern.

single phase induction motor
Induction Motor


The squirrel cage rotor for aluminum, copper, or bars. Copper and aluminum are calling conductors of the rotor bars and set the rotor on the periphery of the holes. Aluminum, copper rings or the end of the rotor conductors rings. These leaders provide mechanical strength of the rotor in a row near the end of the seal fills like a squirrel cage induction motor as a cage from which it derived its name.

Construction slip ring brushes without the introduction of a single moving part, strong and very simple.

Operating principle of single phase induction motor

NOTE: We know that for the operation of an electric motor, regardless of its AC or DC motor, two fluxes are needed since the interaction of these two fluxes produces the required torque.

When we apply a single-phase AC power supply to the stator winding of the single-phase induction motor, the alternating current starts flowing through the stator or main winding. This alternating current produces an alternating flux called the main flux. This main flux also connects with the rotor leads and then cuts the rotor leads. According to Faraday's law on electromagnetic induction, emf is induced in the rotor. When the rotor circuit is closed, the current starts flowing in the rotor.

This current is calling the rotor current. This rotor current produces its flux called the rotor flux. Because this flux is producing to the induction principle, the motor that works on this principle takes its name from an induction motor. Now there are two streams. One is the main flux, and another is the rotor flux. These two fluxes produce the desired torque that is required by the motor to rotate.

Why is a single phase induction motor not autonomous?
According to the rotation of double-field theory, and can solve any alternating quantity in the two components. Each component has an amplitude equal to half the maximum size of the alternating quantity, and both of these components rotate in the opposite direction relative to each other. For example - a flux (φ) can solve in two components.

Each of these components rotates in the opposite direction if one φm / 2 rotates clockwise, and the other φm / 2 rotates counterclockwise.

When we apply a single-phase AC power supply to the stator winding of the single phase induction motor, it produces its magnitude flux, φm. According to the double-field revolution theory, this alternating flux, φm, is divided into two magnitude components φm / 2. Each of these components will rotate in opposite direction, with that synchronous speed, Ns. We call these two flux components as a flux forwarding component, φf and the backward flux component, φb.

Now at the starting condition, both the forward and backward components of the flux are exactly opposite each other. Furthermore, both these flux components are equal in magnitude. Thus, they cancel each other out and so the net torque experienced by the rotor at the starting condition is zero. Thus, single-phase induction motors are not self-priming motors.

Single phase induction motor methods as a self-starting motor
We can easily find above that one-phase induction motor is not self-rotating, because the produced stator flux alternates in this nature and at start-up the two components of this flux each other, out and so there is no torque network. The solution to the problem is the matter you have to do if some of the flow of the Stator, alternate the direction of the latter, rather, we suppose that turns it into a particular type. So the induction motor will become self-ignition. Now to produce this rotating magnetic field, we need two alternating fluxes, with a certain angle of the phase difference between them.

When these two fluxes interact with each other, they will produce a resulting flux. This resulting flux is rotating in nature and rotates in space only in one particular direction. Once start the motor, we can remove the additional flux. The motor will continue to operate only under the influence of the main flux. Depending on the methods for producing asynchronous motors such as automatic starting motors. There are mainly four types of single-phase induction motors, i.e.

1. Two-phase induction motor,
2. Capacitor start-up motor,
3. Induction motor for the operation of the condenser starting capacitor.
4. Permanent capacitor motor or single value capacitor.

I think you understand the principle of Single phase induction motor and basic. If you like this article please follow this site for more updates.

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