Slip rings Induction motor provides some advantages like provides high starting torque, low starting current and it improves the power factor. We can add external variable resistance to the rotor of this type of motor.
What are the advantages of wound type rotor over squirrel cage rotor?
The wound-rotor motors have the following advantages over the squirrel cage motors : (i) High starting torque and low starting current. (ii) Smooth acceleration under heavy load. (iii) No abnormal heating during starting.
What are the advantages of slip ring induction motor over squirrel cage?
Induction motors generally will have low starting torque compared to dc series motor. Slip ring induction motor have big advantage of having high starting torque compared to squirrel cage motor. Therefore slip ring induction motors are generally employed where load requires high starting torque or good speed control.
What are the advantages of cage rotor over slip ring induction motor?
Require less maintenance (as there are no slip rings or brushes) Good speed regulation (they are able to maintain a constant speed) High efficiency in converting electrical energy to mechanical energy (while running, not during startup)
What are the advantages and disadvantages of a squirrel cage motor over a wound rotor?
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 the difference between squirrel cage and wound rotor?
The slip ring motor is also called phase wound rotor. … The copper loss in the phase wound motor is high as compared to squirrel cage motor. The efficiency of the slip ring motor is low whereas the squirrel cage motor has high efficiency. The speed of the phase wound motor is controlled by using the resistance circuit.
What is the advantage of wound rotor motor?
Slip rings Induction motor provides some advantages like provides high starting torque, low starting current and it improves the power factor. We can add external variable resistance to the rotor of this type of motor. So, we are able to control the speed of this type of motor easily.
What are the advantages of slip system?
The main advantages of the slip system are: (1) The bank saves a lot of clerical labour as most of the slips are filled in by its customers. (2) Subsidiary books are avoided as posting is done from slips. (3) Entries can be recorded with minimum delay as slips can easily pass from hand to hand among clerks concerned.
What is difference between commutator and slip rings?
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 main difference between a slip ring and a squirrel cage induction motor?
1. The major difference between them is that the slip ring’s motor comes with an external circuit that controls the speed of a motor. On the other hand, the squirrel cage motor does not have any external circuit and it is not possible to add one since the motor bar is spotted permanently at the end of that ring.
Why slip rings are 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.
Why it is called squirrel cage induction motor?
Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. They are so-called “squirrel cage” motors because the shape of their rotor – the inner component connected to the output shaft – looks like a cage.
Which type of motor has high starting torque?
DC motor has high starting torque.In a series motor the same current flows through the armature and the field winding.
Why squirrel cage rotor is skewed?
The conductors are often skewed slightly along the length of the rotor to reduce noise and smooth out torque fluctuations that might result at some speeds due to interactions with the pole pieces of the stator, by ensuring that at any time the same fraction of a rotor bar is under each stator slot.
Why squirrel cage rotor is short-circuited?
Shorting of rotor bars in form of squirrel cage cause the suitable low impedance path for rotor induced currents. … When the rotor is stationary, the revolving magnetic field cuts the short-circuited secondary conductors at synchronous speed and induces in them line-frequency currents.
Do squirrel cage motors have brushes?
Construction: A slip ring motor gest a complex construction owing to the use of slip rings and brushes, whereas, squirrel cage motors are simply-built. .