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What type of sqiurrel-cage rotor has the highest starting torque?
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What is the use of double cage rotor in induction motor?
to obtain high starting torque
What does the torque do to the rotor?
It rotates the rotor. Torque is produced by the magnetic force on the current induced in the squirrel cage. This magnetic force acts as torque on the rotor as a tangential force that makes it spin.
How do you increase starting torque in cage type 3-phase induction motor's?
by adding external resistance to the shaft of rotor
What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
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 use of double cage rotor in induction motor?
to obtain high starting torque
Why DC motors are self starting?
As magnetic field of dc motor is constant. Whenever a current is given to rotor winding there will be a magnetic flux in air gap between rotor and winding so there will be torque in rotor of f=ibl. so due to this torque rotor get rotate and get started.
What is the function of anti-torque rotor of a helicopter?
To counteract the force of torque created by the main rotor. If not for that tail rotor, the torque would cause the helicopter to spin continuously around.
What does the torque do to the rotor?
It rotates the rotor. Torque is produced by the magnetic force on the current induced in the squirrel cage. This magnetic force acts as torque on the rotor as a tangential force that makes it spin.
Why synchronous motor is not self starting?
As per the operating principle of the Synchronous motor, due to continuous & rapid rotation of stator poles,the rotor is subjected to a torque which is rapidly reversing i.e. in quick succession,the rotor is subjected to torque which tends to move it first in one direction & then in the opposite direction.Owing to its large inertia,the rotor cannot instataneously respond to such quickly-reversing torque,with the result that it remains stationary or in other words it is not self starting.
How do you increase starting torque in cage type 3-phase induction motor's?
by adding external resistance to the shaft of rotor
How much torque does tail rotor needs to work?
Enough to counter the torque from the main rotor. How much that is depends on the helicopter in question - a Blackhawk needs less tail rotor torque than a CH-53E.
What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
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 mechanism used to minimize torque in tricopter?
A small tilt is applied to one rotor to counteract yaw from unbalanced rotor torque
What is the torque speed characteristic?
the ratio of the relative speed of stator magnetic field with the speed of rotor, to the speed of rotor is defined as slip. where as in torque slip characteristic is the graph between the speed of the rotor and the torque experienced on the rotor. in the case of induction motor, the torque decreases with the increase in the rotors speed. while in the case of sychronous motor, its different (you check out, because i just forgot about it!! keep smiling!
Pull-out torque of induction motor?
The pullout torque is the maximum torque a motor can achieve. Also known as breakdown or peak torque. It occurs at the point where, the increase in the rotor current is exactly balanced by the decrease in the rotor power factor.
