What are the functions of slip-rings in Induction motor?

Sliprings are used in wound-rotor induction motors, so that external variable resistors can be incorporated in the rotor circuit in order to provide speed control.

It depends on the type of motor: commonly either three, or none.

Yes the Induction motor works on Electromagnetic induction principle.

induction motor start by magnetic motor

A single phase induction motor is only ever used for small loads. Functionally, an induction motor is an AC motor, in which the current is produced by electromagnetic induction.

Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.

A single phase induction motor is mainly used in fans.It is capacitor start capacitor run induction motor.In three phase induction motor squirrel cage induction motor is mainly used in elevators,lifts,cranes.slip ring induction motor is mainly used in electrically driven ships.

Induction motor is an AC electric motor which uses electromagnetic induction to induce the electric current in the rotor to produce torque.

1. Induction Motor has an air-gap but transformer has no air gap rather it is mutually link. 2. Induction Motor has high no-load current than transformer. 3. Induction Motor is a dynamic device. 4. Induction Motor has high power factor.

Induction motor used in industries for variable speed machines . Induction motor has always lagging power factor. Less cost compared to syn. Motor.

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Squirrel cage type is a type of Induction motor. It tells that the rotor is "squirrel cage" type. Another type of induction motor is with "slip ring" type of rotor. Squirrel cage type is most widely used Induction motor.

split phase induction motor,capacitor start induction motor

induction motor has mechanical losses whereas transformer is a static device the mechanical losses are absent hence induction motor has less efficiency

Open ended induction motor - i assume you are talking about split phase induction motor. With these motors old style speed controlling method using external resistors can be used. However this is now obsolete.

why the induction motor cannot run at synchronous speed

the induction motor is not self start in 3phase because it have a phase difference

According to types of rotors.... Induction motors are classified into two types. They are 1.sqirrel guage induction motor 2.slip ring induction motor/...........

Slip Ring Induction Motor and Squirrel Cage Indution Motor

The single phase induction motors are made self starting by providing an additional flux by some additional means. Now depending upon these additional means the single phase induction motors are classified as: 1.Split phase induction motor. 2.Capacitor start inductor motor. 3.Capacitor start capacitor run induction motor. 4. Shaded pole induction motor.

slip power is a power which is develop by the induced voltage and current in an induction motor

why three phase induction motor is delta connected

Yes, a three phase induction motor is self starting.

Induction motor is operating at transformer's principle.so,it is called ROTATING TRANSFORMER.

A standard 3 phase, AC Induction motor is asynchronous machine, not synchronous.

the circle diagram of induction motor is used to find the losses and efficiency of induction motor

an induction motor rotes because of the magnetic field produced around it and as the current flows

That indicates a fault in the induction motor.

Yes, that is one of the major advantages of a three-phase induction motor.

Could be a single phase induction motor of 20-40 watts.

electromagnetic induction

Induction motor

it is not possible.......

In induction motors no seprate source is required to start the motor,and motor itself induces emf as the word induction clearly reflects it starting principle while in case of synchronous motors ,motor is synchronised with an external source of emf.

we can either use dc series motor or induction machine ,but dc supply is not easily available so we use induction motor ,

by changing the ryb phase altornat e.g. rby ,bry , yrb we change the direction of the induction motor .. . ..

Induction motor by design is inductive load. Hence the PF tends to be lower

Without describing the symptoms it is hard to diagnose a problem with a three phase induction motor.

how reversing an ac single phase induction motor to wark as induction generator

1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.

Synchronous motor or induction motor

In a three phase induction motor, the rotation of motor is reversed by interchanging a phase on the motor terminals. (RYB - gives a direction, RBY gives reverse direction)

capacitive start motors start by themselves however a normal single phase induction motor requires a starter motor to 'kick-start' the motor into action.

Single phase Induction motor

what is the power factor of motor

Induction motor

Motor must be connected to its designed winding. Induction motor does not have two windings. It is either star or delta connected.

because at the starting the induction motor drawn a heavy current thats why we use starter to increase the starting resistance of the induction motor!

the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed

The heating time constant is the time that an induction motor takes to reach it's operational temperature.