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”.
How does a traction motor work?
Traction motor refers to a type of electric motor. A traction motor is used to make rotation torque on a machine. It is usually changed into a straight line motion. Traction motors are used in electrically powered rail vehicles such as electric multiple units and electric locomotives.
Which motor is used in electric traction?
The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils. Motors for a typical locomotive would be in the range 400 to 600 kW.
Do electric cars use traction motors?
Key Components of an All-Electric Car
Electric traction motor: Using power from the traction battery pack, this motor drives the vehicle’s wheels. … It also communicates with the charging equipment and monitors battery characteristics such as voltage, current, temperature, and state of charge while charging the pack.
What are the advantages and disadvantages of electric traction system?
Low maintenance cost. The weight of d.c motor per H.P is less in comparison to a.c motors. Efficient regenerative braking as compared to single phase a.c series motors. there are frequent stops and distance is less.
What is a traction motor used for?
A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, elevators or electric multiple unit.
Do trains run on AC or DC?
Direct current, either directly supplied, or converted from AC onboard a train, is the most commonly used. This is because, according to railsystem.net, “DC consumes less energy compared to an AC unit for operating the same service conditions.
What are the advantages of electric traction?
Advantages of Electric Traction Drives
- DC series motors are employed in electric traction whose starting torque is high. …
- Electric locomotives require less maintenance compared to other drives.
- As it has no smoke it is well suited in underground transport services.
- economical operation cost.
Which DC motor is used in electric train?
Today’s advanced electric locomotives use brushless three-phase AC induction motors. These polyphase machines are powered from GTO-, IGCT- or IGBT-based inverters. The cost of electronic devices in a modern locomotive can be up to 50% of the cost of the vehicle.
Why train engines are not turned off?
Another reason why the engine is not switched of is the fact that the diesel engine contains usually 16 big size cylinders. So if the engine is switched off, it takes time to achieve ignition temperature. Besides, there are many components that are kept running along with the engine.
Do electric trains have engines?
Instead of a tank of diesel and an engine, the train has a tank of hydrogen and a fuel cell that combines the hydrogen with oxygen from the air, without combustion. With the only emission being water, the fuel cells provide power and have zero emissions.
Do electric trains have gears?
Electric locomotives have a single gear. Freight engines have a low gear with a ratio of around 1:4.5 and passenger train engines around 1:2.5. This means that freight engines are strong but have a low top speed, while passenger train engines are weaker but with higher top speed. Yes, there are trains with gears.
What are the disadvantages of electric cars?
What Are the Disadvantages of Owning an Electric Car?
- Electric cars have a shorter range than gas-powered cars.
- Recharging the battery takes time.
- They are usually more expensive than gas-powered cars.
- It can sometimes be difficult to find a charging station.
- There aren’t as many model options.
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 …