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.
Which motor is used in locomotive?
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.
How many traction motors does a locomotive have?
A modern locomotive is a hybrid. The diesel doesn’t drive the train; it cranks an alternator, which powers the six huge electric traction motors that actually turn the locomotive’s wheels. Each motor is set transversely between a pair of drive wheels.
What are various types of traction motors?
The three main types of electric traction systems that exist are as follows: Direct Current (DC) electrification system. Alternating Current (AC) electrification system. Composite system.
What is traction control in train?
Traction motor control with inverters used on railways is performed on the basis of rotor frequency detected by a speed sensor installed on the motor. … Speed sensorless vector control achieves high torque control performance without speed sensors by estimating rotor frequency from inverter voltage, motor current, etc.
What is traction drive?
The traction drive is a non-gear reduction technology that minimizes vibration and noise. The negligible transmission error makes it the smoothest and most quiet method to me- chanical adjust speed and torque. The following a brief explanation. Primary Advantages of the Traction Drive.
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.
How does a locomotive get traction?
All train cars have roller bearings on their axles, these bearings reduce friction which makes roll easy. The locomotive starts to move using sand if the wheels slip and that gives them traction. (If you would take a piece of sandpaper and rub it on a piece of steel you could feel it.)
Why is it called a locomotive?
The word locomotive originates from the Latin loco – “from a place”, ablative of locus “place”, and the Medieval Latin motivus, “causing motion”, and is a shortened form of the term locomotive engine, which was first used in 1814 to distinguish between self-propelled and stationary steam engines.
What voltage is used in locomotive?
A: The auxiliary battery on a locomotive consists of 8 x 8 volt batteries. So the nominal voltage is 64 volts, the open circuit voltage is 68.8 volts, and the float charging voltage is 72 volts.
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.
What is 3rd rail system?
Third-rail system is a means of providing electric traction power to trains, and the system uses an additional rail which is known as “conductor rail” for its work. The conductor rail is placed on the sleeper ends mostly located outside of the running rails. However, a central conductor rail is also used in some cases.
What are the requirements for traction motor control?
General requirements of Traction motors / traction system
- High starting torque. A traction motor must have high starting torque. …
- Simple speed control – …
- Suitable speed Torque Characteristics – …
- Parallel Running – …
- Overload Capacity – …
- Size of Motor – …
- high Efficiency. …
- Braking –
Why do traction motors need control equipment?
The control of traction motors for starting and for smooth acceleration is very much essential to avoid damage to the motors. The control equipment is provided for manual and automatic operation. Usually a master controller is used for the purpose.