This is the most important feature of traction motor provides opportunity for saving on energy but also smoothness in braking, saving on wear and tear in mechanical braking system. An Induction motor works as a generator if mechanical speed is more than the synchronous speed.
Which motor is used for traction purpose?
Many single phase ac motors have been developed for traction purposes but only compensated series type commutator motor is found to be best suited for traction. Single phase induction motors have been abandoned as they are not capable of developing high starting torque.
Why induction motors are not suitable for electric traction?
Answers. Three phase induction motor is not suitable for traction purposes because traction motor requires high starting torque, for urban and sub urban lines, the acceleration (speed at starting) should be high and simple speed control is required to start and stop the motor easily.
What type of motor is used for electric traction Why?
DC motors are used on trains is because of their high torque and good speed control. Compared to AC motors, DC motors can provide industry applications with a fine balance of strong starting torque and controllable speed for seamless yet precise performance.
Why are induction motors commonly used?
Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. … Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service.
Which motor is used for crane travel?
∴ The motor normally used for crane travel is AC slip-ring motor.
Which motor is more suitable and more efficient for traction purpose?
In this type of traction system, AC series motors are used to produce the propulsion of vehicle. This system uses AC voltages from 15-25KV at a frequency of 16.7 (i.e., 16 2/3) or 25 Hz. This low frequency leads to give better performance and more efficient operation by the series motor.
Which motor is not suitable for regenerative braking?
Regenerative braking is not possible in a series motor. Explanation: In regenerative braking, the motor acts as a generator. The back emf is more than the terminal voltage in case of regenerative braking.
What is an advantage of electric traction over other methods of traction?
Advantages of Electric Traction Drives
Due to high starting torque, it is possible to produce high acceleration rates. Electric locomotives require less maintenance compared to other drives. Supply of power to the locomotive is easier through the traction substations.
Why is traction used?
Most often, traction uses devices such as weights and pulleys to put tension on a displaced bone or joint, such as a dislocated shoulder. The tension helps put the joint back in position and keep it still. Traction is also used to keep a group of muscles (such as the neck muscles) stretched to reduce muscle spasms.
Where is induction motor used?
AC induction motors are the most common electric motors in the world. These simple, reliable and economical motors are found in refrigerators, washing machines and furnaces, as well as conveyors, pumps, winders, wind tunnels and other industrial equipment.
What is the principle of induction motor?
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.
Why is an induction motor used for most domestic applications?
Induction motors are used in industrial and domestic appliances because these are rugged in construction requiring hardly any maintenance, that they are comparatively cheap, and require supply only to the stator.