What is the advantage of the wound rotor motor over the squirrel cage motor?

Following are significant advantages of the wound rotor: High capacity of overloading. Use of lesser current as compared to squirrel cage motor. Maintain a constant speed while running.

Regarding this, what is the difference between a squirrel cage motor and a wound rotor motor?

A squirrel cage rotor has very low resistance bars cast into the rotor steel which acts as the secondary windings. A slip ring (wound rotor) motor has insulated wire rotor windings which feed out through slip rings to a bank of large variable resistors where the resistance of the rotor circuit can be varied.

Furthermore, what are the advantages of squirrel cage induction motor over DC motor? *Squirrel Cage Induction motors are cheaper in cost compared to Slip Ring Induction motors. *Squirrel cage motors are explosion proof due to the absence of brushes slip rings and brushes which eliminates the risks of sparking.

Herein, which of the following is an advantage of the squirrel cage induction motor over the wound rotor induction motor?

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. As a result the inrush current is reduced. Another important advantage over squirrel-cage motors is higher starting torque.

What are wound rotor motors used for?

Wound Rotor Induction Motor is used in applications which require smooth start and adjustable speed. Some of the applications of this motor include cranes, mills, hoists and conveyors. Wound rotor induction motor is also used in fans, blowers and mixers. They are used in large pumps in water industry.

39 Related Question Answers Found

Why is it called squirrel cage motor?

It is called a 'squirrel cage' motor because the rotor inside of it – known as a 'squirrel cage rotor' – looks like a squirrel cage. The interaction of the magnetic fields produced by the stator and rotor windings produces a torque on the squirrel cage rotor.

Is a squirrel cage motor AC or DC?

They are easy to use, basic in design, and come in many forms, allowing them to succeed in almost every situation. Electric motors can be powered via direct current (DC) or alternating current (AC), and this article will investigate a specific AC motor known as the squirrel cage motor.

What are the applications of DC motors?

Applications. DC motors are suitable for many applications – including conveyors, turntables and others for which adjustable speed and constant or low-speed torque are required. They also work well in dynamic braking and reversing applications, which are common in many industrial machines.

Why do we use slip rings in motors?

Slip rings in AC motors

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. Adding resistance to the rotor windings brings the rotor current more in-phase with the stator current.

What is the purpose of the squirrel cage?

The purpose of a squirrel cage is to keep hamster owners awake all night listening to the everlasting “scree-scree-scree” metallic scraping sound of the wheel as it goes around and around ALL NIGHT LONG.

Why wound rotor is star connected?

The rotor of a squirrel-cage induction motor is a number of rotor bars connected at both ends. On the other hand, a wound rotor always has a star connection because that allows the external connection of resistors in series with the windings. For either type of rotor, either a star or delta stator can be used.

How is a 3 phase motor wound?

A three-phase, wound-rotor induction motor consists of a stator core with a three-phase winding, a wound rotor with slip rings, brushes and brush holders, and two end shields to house the bearings that support the rotor shaft. ills 1, 2, 3, and 4 show the basic parts of a three-phase, wound-rotor induction motor.

Where are slip ring motors used?

Therefore slip ring induction motors are generally employed where load requires high starting torque or good speed control. They are employed in hoists, elevators, compressors, printing presses, large ventilating fans, loads requiring speed control such as for driving lifts and pumps.

What are the advantages and disadvantages of squirrel cage induction motor?

Squirrel Cage Induction motors are cheaper in cost compared to Slip Ring Induction motors. Requires less maintenance and rugged construction. Because of the absence of slip rings, brushes maintenance duration and cost associated with the wear and tear of brushes are minimized.

What is meant by induction motor?

Definition of induction motor. : an alternating-current motor in which torque is produced by the reaction between a varying magnetic field generated in the stator and the current induced in the coils of the rotor.

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

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 is the principle of slip ring induction motor?

WORKING OF SLIP RING INDUCTION MOTOR: The slip ring induction motor working in the induction principle. when ever the supply is applied to stator winding and stator winding produced magnetic flux. due to faradays law of electromagnetic induction the rotor winding get induced and produce the magnetic flux current.

What are the uses of induction motor?

Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service.

What is synchronous speed?

In a motor, synchronous speed is the speed at which the magnetic field rotates. Depending on motor design, the actual mechanical speed may be equivalent (synchronous motor) or slightly smaller (asynchronous motor). The synchronous speed is a function of: The electrical frequency used, typically 60 Hz or 50 Hz.

What is the slip?

Slip can be defined as the difference between the flux speed (Ns) and the rotor speed (N). Speed of the rotor of an induction motor is always less than its synchronous speed. It is usually expressed as a percentage of synchronous speed (Ns) and represented by the symbol 'S'.

What is rotor in induction motor?

Rotor as the name suggests it is a rotating part of an electrical machine, in which current is induced by transformer action from rotating magnetic field. Induction motor rotor is of two types: Squirrel Cage Rotor. Wound Type Rotor or Slip Ring Type Rotor.

How do you start a synchronous motor?

The synchronous motor is made self starting winding by providing damper windings or squirrel cage winding in the rotor poles. In the faces of the field poles damper windings are provided. Damper windings are the short circuited copper bars inserted in pole faces of field poles.