Three types of motor are used in locomotives: DC motors. AC motors with variable frequency drives. AC permanent magnet motors.
Are train motors AC or DC?
DC gets up to 3000 volts, while AC uses 15,000 – 50,000 volts. Until recently, DC motors have been the preferred type for railways because their characteristics were just right for the job.
Why are DC motors used in trains?
A series-wound DC motor has a low resistance field and armature circuit. … The advantage of high current is that the magnetic fields inside the motor are strong, producing high torque (turning force), so it is ideal for starting a train.
How many traction motors does a locomotive have?
How many traction motors are there in a locomotive and mention how they are Identified? Ans. They are 6 nos of traction motors are available, three traction motors are mounted on front truck and three traction motors are mounted on rear truck.
Do trains have electric motors?
The ignition of diesel fuel pushes pistons connected to an electric generator. The resulting electricity powers motors connected to the wheels of the locomotive. A “diesel” internal combustion engine uses the heat generated from the compression of air during the upward cycles of the stroke to ignite the fuel.
What is more efficient AC or DC?
1. DC power is significantly more energy efficient than AC power. DC motors and appliances have higher efficiency and power to size characteristics. … The greater efficiency resulting from recent developments in DC converter technology allows improvements in electricity delivery over long distances.
Which current is used in train?
Depending on the design of the train, this DC current can either be used directly to power the train’s traction motors or will need to be converted to three-phase AC using inverters.
What are the 3 types of DC motors?
Types of DC Motors. There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.
Which DC motor is used in tramways?
DC Traction System
Mostly DC series motors are used in this system. For trolley buses and tramways, DC compound motors are used where regenerative braking is required. The various operating voltages of DC traction system include 600V, 750 V, 1500V and 3000V.
Why do trains have two pantographs?
Firstly, two pantographs are fixed as to use the other one when the running panto is damaged. Both of them don’t commission at a time. … When front panto is used, most of the frost get scattered outside the loco. But if rear panto is used, frost falls on loco body which might damage electrical equipment on the loco top.
How much electricity does a locomotive produce?
The diesel engine makes 3,200 horsepower, and the generator can turn this into almost 4,700 amps of electrical current. The four drive motors use this electricity to generate over 64,000 pounds of thrust. There is a completely separate V-12 engine and generator to provide electrical power for the rest of the train.
Are diesel locomotives AC or DC?
In a diesel–electric locomotive, the diesel engine drives either an electrical DC generator (generally, less than 3,000 horsepower (2,200 kW) net for traction), or an electrical AC alternator-rectifier (generally 3,000 horsepower (2,200 kW) net or more for traction), the output of which provides power to the traction …
Do trains have gears?
modern locomotives use electric traction. This is much more flexible than gears. Diesels run generators from the combustion engine (usually constant torque) and transform the energy using an alternator/generator to run the traction motors. … No, trains have no gears, since these are unfeasible.
Which is the world’s fastest train?
The current world speed record for a commercial train on steel wheels is held by the French TGV at 574.8 km/h (357.2 mph), achieved on 3 April 2007 on the new LGV Est.
Why train engines are not turned off?
Another reason for not turning off diesel train engines, lies in the engine itself. … It is also interesting to know that while diesel locomotives are idling, fuel consumption is more than when the train is moving. This is because, while idling, the batteries are being charged, and the air compression is in operation.
Do locomotives have toilets?
Yes, all over the road locomotives, and local use locomotives are equipped with toilets in small rooms in the front hood area of the locomotive. … Some have an air pressure assisted flushing system using fresh water similar to an airline toilet.