Which induction motor is used in traction?

Several drives employing squirrel cage induction motors and synchronous motors are in use for traction. Variable frequency control is used both for induction motors and synchronous motors. Modes of operation of an induction motor traction drive are shown in figure 2.

Which type of motor used in locomotive?

DC motors
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.

What is difference between traction motor and induction motor?

An induction motor does not require contacts inside the motor. These AC motors are simpler, and more reliable than the old DC motors. AC induction motors known as asynchronous traction motors. Usually, the traction motor is mounted between the wheel frame and the driven axle.

Why induction motor is used in traction?

An Induction motor works as a generator if mechanical speed is more than the synchronous speed. Maximum value o regenerative tractive effort is limited to 25T and so is negative torque of the traction motor.

How traction motor works in locomotive?

With commercial-frequency, alternating-current systems, there are two practical ways of taking power to the locomotive driving wheels: (1) by a rotary converter or static rectifier on the locomotive to convert the alternating-current supply into direct current at low voltage to drive standard direct-current traction …

Are locomotives AC or DC?

All in all, the AC traction locomotive offers about twice the amount of adhesion as a DC unit. Therefore, a modern lightweight AC locomotive such as the RX500 can provide as much or more tractive effort than an old style DC unit like the SW1200 which weighs 60% more.

Which motor is more suitable for traction service?

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.

What is the function of traction motor?

The traction motor of EVs is responsible for converting electrical energy to mechanical energy in such a way that the vehicle is propelled to overcome aerodynamic drag, rolling resistance drag, and kinetic resistance.

How does a DC traction motor work?

The DC motor works because, simply put, when a current is passed through the motor circuit, there is a reaction between the current in the field and the current in the armature which causes the armature to turn. The armature and the field are connected in series and the whole motor is referred to as “series wound”.

Which motor is most suitable for traction?

Why induction motors are not suitable for electric traction?

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 is the application of electric traction motor?

A traction motor is an electric motor used for propulsion of a vehicle, such as an electric locomotive or electric roadway vehicle.

How is a three phase induction motor equivalent to a transformer?

This could only be possible with the introduction of variable voltage variable frequency control. AC induction motor is equivalent to Transformer where secondary is short circuited and free to rotate. Three phase primary winding is mounted on Stator distributed spatially at 120 degree.

Why are electric motors used in diesel locomotives?

The use of a diesel engine frees the locomotive from being coupled to an external electricity supply, and the use of electric motors and drives allows control over the traction capabilities of the locomotive which would not be possible with a direct drive from the diesel engine. Motors can be mounted in a number of different configurations:

How is the speed of an induction motor controlled?

Speed Control of Traction Motor. Speed of an Induction motor depends only on number of poles and frequency of applied power supply from the formula ω s=120f/p or to some extent by reducing the supplied voltage which results in reduction of generated torque resulting in reduction of speed.

Which induction motor is used in traction? Several drives employing squirrel cage induction motors and synchronous motors are in use for traction. Variable frequency control is used both for induction motors and synchronous motors. Modes of operation of an induction motor traction drive are shown in figure 2. Which type of motor used in locomotive?…