A Double Cage Induction motor is that type of motor in which a double cage or two rotor windings or cages are used. This arrangement is used for obtaining high starting torque at a low value of starting current. The stator of a double cage rotor of an induction motor is same as that of a normal induction motor.
What is cage induction motor?
A 3 phase squirrel cage induction motor is a type of three phase induction motor which functions based on the principle of electromagnetism. … The interaction of the magnetic fields produced by the stator and rotor windings produces a torque on the squirrel cage rotor.
What is a deep bar cage rotor?
The Deep Bar Rotor in an induction motor is used to obtain high rotor resistance at starting and low rotor resistance at the running condition. The figure below shows a deep bar cage rotor with deep and narrow bars. A bar may be assumed to be made up of a number of narrow layers connected in parallel.
What are the two main parts of an induction motor?
Like any other electrical motor, induction motor have two main parts namely rotor and stator.
What are the different types of rotor used in induction motor?
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.
How does an induction motor start?
When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. … At the time of starting, the motor slip is unity, and the starting current is very large.
Why starter is used in induction motor?
The three phase induction motors are self-starting due to rotating magnetic field. But the motors show tendency to draw very high current at the time of starting. … Hence there should be a device which can limit such high starting current. Such a device which limits high starting current is called a starter.11 мая 2017 г.
What is cogging and crawling?
A.Cogging can also be reduced by using skewed rotor. Q.What is Crawling? A: It has been observed that squirrel cage type induction motor has a tendency to run at very low speed compared to its synchronous speed, this phenomenon is known as crawling. The resultant speed is nearly 1/7th of its synchronous speed.
Why double cage construction is used in motors?
A Double Cage Induction motor is that type of motor in which a double cage or two rotor windings or cages are used. This arrangement is used for obtaining high starting torque at a low value of starting current. … Thus, the resistance of the outer cage is greater than the resistance of the inner cage.
Why is the power factor of a 3 phase induction motor low at no load?
At no load, an induction motor draws a large magnetizing current and a small active component to meet the no-load losses. Therefore, the induction motor takes a high no-load current lagging the applied voltage by a large angle. Hence the power factor of an induction motor on no load is low.
What are the main parts of induction motor?
The stator of the three-phase induction motor consists of three main parts :
- Stator frame,
- Stator core,
- Stator winding or field winding.
What are the major parts of induction motor?
Parts of an Induction Motor
- The A.C. Induction Motor has three main parts, rotor, stator and enclosure. …
- The stator is the stationary part of the motor’s electromagnetic circuit and is made up of thin metal sheets, called laminations. …
- Coils of insulated wire are inserted into slots of the stator core.
What is the working principle of induction motor?
The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.
What is the main disadvantage of synchronous motors?
The disadvantages of Synchronous motor includes: Synchronous motors require dc excitation which is supplied from external sources. These motors are not self-starting motors and need some external arrangement for its starting and synchronizing. The cost per kW output is commonly higher than that of induction motors.
What are the two types of rotor?
Induction motor rotor is of two types:
- Squirrel Cage Rotor.
- Wound Type Rotor or Slip Ring Type Rotor.
What are 3 phase induction motors used for?
Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans.