Traction motors are powered by electricity and generate the power to rotate the wheels of the train. The turning force produced by traction motors is transmitted to the wheels via the driving gear unit and axle. Traction motors are typically mounted in the trucks where the wheels are housed.
How does an electric traction motor work?
A traction motor is an electric motor used to drive a piece of machinery. Consisting of heavy wire wound inside of the motor’s case known as the field windings and wire wound around the motor’s inner shaft called the armature, the electric power is transported between the two elements through brushes.
What is the difference between AC and DC traction motors?
The primary advantages of AC traction are adhesion levels up to 100% greater than DC and much higher reliability and reduced maintenance requirements of AC traction motors. The friction coefficient between wheel and rail is usually in the range of . … 45 for old DC units to about . 90 for modern AC units.
How does a traction converter works?
Traction inverter transforms DC voltage in the middle DC link into three-phase alternating voltage between 0 to 2808 V with frequency in 0 ~ 180 Hz. In the braking operation it is reversed. Traction motor is the core component of energy conversion between power and mechanical energy.
What are the different motors used for AC DC traction?
List of Electric Motors Used for Traction | Electrical Engineering
- DC Series Motor: In this article dc series motor will be analysed from the point of view of requirements of traction service. …
- DC Shunt Motor: …
- AC Series Motor: …
- Three Phase Induction Motor: …
- Linear Induction Motor:
Are locomotives AC or DC?
Rectifier locomotives, which used AC power transmission and DC motors, were common, though DC commutators had problems both in starting and at low velocities. Today’s advanced electric locomotives use brushless three-phase AC induction motors.
Why AC motor is used in electric cars?
An AC motor is actually a three-phase motor that has a speed feature of running at 240 volts. … When it comes to road performance, electric vehicles with AC motors can get a better grip at rougher terrains and run more smoothly. It also has more acceleration.
Why is DC preferred over AC?
Answer: Ac is more preferred than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transimission. When fault occurs it is easy to interrupt ac supply.
Why is AC preferred over DC?
The reasons for preferring the AC system over DC are as follows: It is easy to maintain and changes the voltage of AC power for transmission and distribution. … The maintenance cost for AC transmission is lower than the DC transmission. In the DC System, the speed control range is greater than the AC System.
Why is AC preferred to DC system for powering to electric traction?
DC train consumes less energy compared to AC unit for operating same service conditions. The equipment in DC traction system is less costly, lighter and more efficient than AC traction system. It causes no electrical interference with nearby communication lines.
Why is it called a traction motor?
AC induction motors known as asynchronous traction motors. Before the mid-20th century, a single large motor was often used to drive multiple wheels through connecting rods. This was the same way that steam locomotives would turn their drive wheels. … The rotating shaft of the motor was also the axle for the wheels.
What is Arno converter used in traction?
This is a rotary convertor which has a combined set of windings and is used to convert the single phase supply from the Tertiary winding of the Loco transformer to Three-Phase AC which is fit for use by the various Auxiliary machines in the loco.
Are Tesla Motors AC or DC?
Tesla, for example, uses alternating current (AC) induction motors in the Model S but uses permanent-magnet direct current (DC) motors in its Model 3. There are upsides to both types of motor, but generally, induction motors are somewhat less efficient than permanent-magnet motors at full load.
Can a DC motor run on AC?
We already know that in a DC Series motor the field winding has very less resistance than a DC Shunt Motor as the field is connected in series with the Armature Winding. So if we give AC supply on a DC Series Motor it will run perfectly. In fact, DC Series can run on both AC and DC supply.
Why induction motor is used in traction?
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.