Compared to a squirrel-cage rotor, the rotor of the slip ring motor has more winding turns; the induced voltage is then higher, and the current lower, than for a squirrel-cage rotor. During the start-up a typical rotor has 3 poles connected to the slip ring. Each pole is wired in series with a variable power resistor.

What is a slip on rotor?

“Slip” in an AC induction motor is defined as:

As the speed of the rotor drops below the stator speed, or synchronous speed, the rotation rate of the magnetic field in the rotor increases, inducing more current in the rotor's windings and creating more torque. Slip is required to produce torque.

What is a slip ring and what does it do?

A slip ring passes electrical signals and power across a rotating interface using sliding electrical contacts. These contacts are typically a rotating ring and a stationary brush, or wiper, that slides along the ring surface during rotation.

What is slip ring in machine?

A slip ring is an electromechanical device that allows the transmission of power and electrical signals from a stationary to a rotating structure. A slip ring can be used in any electromechanical system that requires rotation while transmitting power or signals.

Which type of rotor is used in slip ring induction motor?

The rotor of this type of motor is wound type. It comprises of a cylindrical laminated steel core and a semi-closed groove at the outer boundary to accommodate a 3-phase insulated winding circuit. As seen in the figure above, the rotor is wound to match the number of poles on the stator.

Slip ring Induction Motor, How it works ?

31 related questions found

What is the type of rotor?

There are two types of induction motor rotors: Squirrel-cage rotor or simply cage rotor. Phase wound or wound rotors. The motors that use this type of rotor are known as Slip-ring rotors.

Why slip ring is used in induction motor?

In a version of the AC induction motor referred to as a wound rotor motor, slip rings are used not for transferring power, but for inserting resistance into the rotor windings. ... As the slip rings turn with the rotor, the brushes maintain constant contact with the rings and transfer the resistance to the rotor windings.

Where are slip rings used?

A slip ring is a method to make an electrical connection from a stationary object to a rotating assembly. These are used in many industrial automation applications and for equipment like tower and jib cranes, as well as cable and hose winders, where a portion can spin freely, while the base is fixed.

What is the function of slip ring in motor?

Slip rings: slip ring is a semi-circle shaped electrochemical device used to rotate a coil in the generator. The main function of these slip rings is to transmit electric power into a coil which is at rest to make it move or particularly rotate it.

How does slip ring motor work?

A wound-rotor motor, also known as slip ring-rotor motor, is a type of induction motor where the rotor windings are connected through slip rings to external resistance. ... When the motor reaches full speed the rotor poles are switched to short circuit. During start-up the resistors reduce the field strength at the stator.

Is slip ring and commutator the same thing?

The main difference is that commutator is used for the conversion of AC to DC. ... Slip rings are used in AC motors to provide a continuous transfer of power whereas the commutators are used in DC motors to reverse the polarity of the current in the armature windings.

What is the difference between induction motor and slip ring motor?

The slip ring induction motors have high starting torque with low starting current whereas squirrel cage motors have low starting torque and high starting current. Slip-ring motor has smooth acceleration under heavy loads as compare to the squirrel cage motor.

Is slip ring a commutator?

A commutator is a specialized slip ring typically used on Direct Current motors and electrical generators to transfer electrical power between the stationary housing and the rotating armature with the added purpose of reversing the electrical current direction.

What is a rotor speed?

Rotor spinning

Rotor speeds typically lie in the 120–210 m/s range, but mostly between 150 and 190 m/s, with a tendency to be higher with a smaller rotor diameter [6]. Currently the smallest rotor diameter used industrially is 28 mm with rotor speed up to 150,000 rpm, though some machines can reach 160,000 rpm.

How does slip rings work in AC generator?

Slip rings maintain constant contact with the same sides of the coil. As one side of the coil moves up through the magnetic field, a potential difference is induced in one direction. As the rotation continues and that side of the coil moves down, the induced potential difference reverses direction.

What is the purpose of slip rings on an AC alternator?

For the alternators, an electrical slip ring is used that allows the alternation of current to electrical energy via a mechanical energy. This is how slip rings work transferring the energy from a stationary object to a rotating one.

What is the function of slip ring in DC generator?

Slip rings are used in rotating electrical assemblies to make a continuous electrical connection between stationary and moving conductors. This enables the stationary power source to transmit electrical power to the rotating component.

What is rotor and types of rotor?

Type and construction of rotors. ... There are two designs for the rotor in an induction motor: squirrel cage and wound. In generators and alternators, the rotor designs are salient pole or cylindrical.

What is the rotor in a motor?

The term "rotor" is derived from the word rotating. The rotor then is the rotating part of the AC motor. The objective of these motor components is to make the rotor rotate which in turn will rotate the motor shaft.

What is a rotor in centrifugation?

A centrifuge rotor is the rotating unit of the centrifuge, which has fixed holes drilled at an angle. Test tubes are placed inside these holes and the rotor spins to aid in the separation of the materials. There are three types of centrifuge rotors: swing-bucket, fixed-angle and vertical rotors.

Are slip rings used in DC motor?

Note:Though slip rings sound familiar to commutators, they cannot be used in the d.c motors to transmit power. Slip rings are used only in the structure which has both stator and rotor.

What would happen if we use slip ring to drive a DC motor?

What would happen if we use slip ring to drive a DC motor? The slip ring is a part of an AC motor use for transmission the energy between the stationary and rotating element of the machine. Now if Slip Rings are used in DC motor than the coil of DC motor will have no rotation instead it will oscillate.

What is the difference between squirrel cage rotor and slip ring rotor?

Key Differences Between Slip Ring & Squirrel Cage Induction Motor. The motor whose rotor is wound type such type of motor is called slip ring induction motor, whereas the squirrel cage motor, has a squirrel cage type rotor. ... The starting torque of the slip-ring motor is high, whereas in squirrel cage motor it is low.

What are the two types of rotors?

The four different rotor types are:

• Blank & Smooth - Blank and smooth rotors are what you'll find on most passenger vehicles and feature a smooth, blank metal surface all the way around the rotor.
• Drilled - Drilled rotors feature drilled holes around the metal surface.

What is meant by slip ring induction motor?

What is Slip Ring Induction Motor? Definition: It is a type of motor where its external circuit is connected using some rings. This rings attached with high resistance acts as an external circuit for the rotor. This external circuit helps in developing a high starting torque compared to a squirrel cage type.