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to obtain high starting torque
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What is the useful of open end winding of induction motor?
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
Which motor doesn't have any winding on its rotor?
Squirrel cage induction motors.
Why you use brushes for single phase induction motors?
There no brushes in an induction motor. The rotor is independent and is a short-circuited cage of parallel bars.
How do you increase starting torque in cage type 3-phase induction motor's?
by adding external resistance to the shaft of rotor
What is the effect of starting torque and power factor on double cage and deep bar cage 3phase induction motor?
In double cage and deep bar the tarting torque increases due to skin effect in the rotor wire. So the rotor circuit draw less current than simple circuit that draw around 7-8 times the rated current on starting. Due to skin effect the rotor resistance increases and it provide maximum torque at low speed.
What is the useful of open end winding of induction motor?
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
What is squirrel cage induction generator?
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.
Which motor doesn't have any winding on its rotor?
Squirrel cage induction motors.
Why you use brushes for single phase induction motors?
There no brushes in an induction motor. The rotor is independent and is a short-circuited cage of parallel bars.
How do you increase starting torque in cage type 3-phase induction motor's?
by adding external resistance to the shaft of rotor
How to limit starting current of induction motor while designing it?
Traditionally there are two methods to limit starting current at the design stage:Increase the rotor resistance by using smaller section of rotor bars. No. of bars can also be reduced but this will hamper smooth rotation of the motor.Use deep rotor bars or double cage rotor. Both the methods are functionally same but constructionally double cage is more complicated.
What are the different types of induction motors?
DOL(Direct Online starting) Star Delta starting Auto transformer starting Above methods are for squirrel cage induction motor Rotor resistance starting is used for wound rotor or slip ring induction motor
What happen if fan not run in squirrel cage induction motor?
The fan mounted on the shaft is for cooling of the stator and rotor. If the fan stops the motor gets overheated and burns out.
Can a Squirrel Cage Induction motor can be converted to Slip Ring Induction Motor?
yes
What is the effect of starting torque and power factor on double cage and deep bar cage 3phase induction motor?
In double cage and deep bar the tarting torque increases due to skin effect in the rotor wire. So the rotor circuit draw less current than simple circuit that draw around 7-8 times the rated current on starting. Due to skin effect the rotor resistance increases and it provide maximum torque at low speed.
Formula for rotor speed on a cage rotor induction motor?
Nr = NS * (1-s) Nr = rotational speed (rev/sec) Ns = Synch Speed (rev/sec) s = Slip (%)
Disadvantages of a squirrel cage motor?
Squirrel Cage Induction Motor Disadvantages:Some of disadvantages or demerits of squirrel cage induction motors are listed below:Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. Starting torque will be in the order of 1.5 to 2 times the full load torque and starting current is as high as 5 to 9 times the full load current. In slip ring induction motors, higher starting torque can be attained by providing an external resistance in the rotor circuits during starting of the slip-ring induction motor. This arrangement in slip-ring induction motors also reduces the high inrush currents during starting of induction motor.Squirrel cage induction motors are more sensitive to the supply voltage fluctuations. When the supply voltage is reduced, induction motor draws more current. During voltage surges, increase in voltage saturates themagnetic components of the squirrel cage induction motor.Speed control is not possible in squirrel cage induction motor. This is one of the major diadvantages of squirrel cage induction motors.The total energy loss during starting of squirrel cage motor is more compared to slip ring motors. This point is significant if the application involves frequent starting
