How does a traction motor work?
How does a traction motor work?
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.
What are various types of traction motors?
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:
Which motor is used as traction motor?
Traditionally, these were series-wound brushed DC motors, usually running on approximately 600 volts. The availability of high-powered semiconductors (thyristors and the IGBT) has now made practical the use of much simpler, higher-reliability AC induction motors known as asynchronous traction motors.
What are the special features of traction motors?
Mechanical Features: (i) A traction motor must be robust and capable to withstand continuous vibrations since service conditions are extremely severe. (ii) The weight of the traction motor should be minimum in order to increase the payload capacity of the vehicle.
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.
Who makes traction motors?
Wabtec Corporation
Traction Motors | Wabtec Corporation.
What are the types of traction?
The two main types of traction are skeletal traction and skin traction.
Why is DC series motor used in traction?
DC Series motor has high rate of acceleration and retardation. DC Series motor is variable speed motor. Due to these characteristics motor is protected against overload. DC series motor has develops high torque at low speeds, low torque at high speed, this is the basic requirement of traction unit.
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.
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.
Are Model trains AC or DC?
Model train power falls into one of three categories. Alternating current (AC) is the preferred power for most O Gauge three-rail trains as well as some two-rail systems in smaller scales. In three-rail systems, the outer rails are both grounded, and the center rail is “hot.”
Are trains 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 is electric traction system PPT?
The Electric Traction System PPT briefly discusses the Types, supply system, traction motors, braking system, advantages and disadvantages and recent trends. A traction system causes the propulsion of vehicle in which tractive or driving force is obtained from various devices such as diesel engine drives, steam engine drives, electric motors, etc.
What is a traction motor in a locomotive?
Traction motor. Diesel electric locomotive has electric drive in form of traction motors driving the axles and controlled with electronic controls. It differs from electric locomotives principally in that it has its own generating station instead of being connected to a remote generating station through overhead wires.
What is a 4 pole traction motor?
TRACTION MOTOR (1) Description: The traction motor is a four pole DC series motor in which field winding is connected in series with armature. It is a forced ventilated machine arranged for axle mounting on sleeve bearing. Transverse movement is limited by the flanges of axle suspension bearing.
What are the advantages of DC traction system in trains?
Advantages of Direct Current (DC) Traction System In case of trains that require frequent and rapid accelerations, DC traction motors are a better choice as compared to AC motors. DC train consumes less energy compared to AC unit for operating same service conditions.