R.O.T.O.R. was created in 1989.
FC Rotor Volgograd was created in 1929.
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.
Tail rotor thrust is simple the sidewards force provided by the tail rotor. This is required to offset the gyroscopic motion created by the main rotor. When the main rotor spins it creates toque in the opposite direction. The result, without a tail rotor, would be the main body of the helicopter spinning around in the opposite direction uncontrollably. The tail rotor simply provide thrust in the opposite direction to this toque and thus allows the main body of the helicopter to remain stationary. The blades of both the main rotor and the tail rotor spin at the same revs. The pilot adjusts the pedals at his feet to change the amount of sidewards thrust thrust allowing him to control his lateral movement.
Transformer action. There is no electrical connection between the stator and the rotor, and voltages get induced into the rotor bars when they are swept by lines of magnetic flux created by the stator windings.
Because there is no current flowing in the rotor, and thus there is no magnetic field in the rotor, and thus there is no torque between the rotor and the field.
What is a rotor?
the blade is called rotor bladesThe rotor blades on top are called Main Rotor Blades, because they are the main source of lift for the helicopter. The smaller rotor blades on the tail are called Tail Rotor Blades.
Wound rotor and squirrel-cage rotor
The rotor head changes the angle of incidence of the rotor blades as they rotate.
Because with DC stationary field w.r.t. rotor can be easily created,and permanent pole can be created.
What is difference of blocked rotor and locked rotor protection of motor?Read more:What_is_difference_of_blocked_rotor_and_locked_rotor_protection_of_motor
The rotor will have to be removed from the car. It can be resurfaced by mounting it on a special machine that slowly removes metal from the rotor until the rotor is smooth.