Best answer: Why is it called a traction motor?

What is meant by traction motor?

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.

Which motor is used in traction?

AC traction motors have replaced DC motors in many traction applications. 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.

What is the difference between traction motor and induction motor?

An induction motor does not require contacts inside the motor. These AC motors are simpler, and more reliable than the old DC motors. AC induction motors known as asynchronous traction motors. … Usually, the traction motor is mounted between the wheel frame and the driven axle.

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Who invented the traction motor?

Frank J. Sprague

Frank Julian Sprague
Frank Julian Sprague (1857–1934) American inventor, Father of Electric Traction
Born July 25, 1857 Milford, Connecticut
Died October 25, 1934 (aged 77)
Nationality American

What is the use of traction motor?

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?

The majority of trains run on DC motors though. Electric trains run on both overhead AC and DC third rail power. But there are separate designs for the two. AC electric trains run from 25 kV 50 Hz single and dual catenary supply but DC ones run fron 1.5 kV DC third rail system.

Which motor is not used for traction system?

DC shunt motors are not suitable for traction purpose, the reasons are given below: 1. The dc shunt motor is a constant speed motor and its speed-torque characteristic does not meet with the requirements of traction. i.e., the power drawn from supply mains varies directly as the load torque.

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 …

Why regenerative braking is not possible in DC motor?

In case of DC Series motor, as the speed of Motor increases, the armature current and hence the field flux will decrease and therefore Back emf E can never be greater than the supply voltage V. Therefore, Regenerative Braking is not possible in DC Series Motor.

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Which method is best for series traction motors?

Explanation: Series-parallel control method is superior to the rheostatic control insofar as efficiency is concerned. However, it is limited to two speed steps. The method is commonly employed for speed control of series traction motors.

What is in a DC motor?

A DC motor consists of an stator, an armature, a rotor and a commutator with brushes. Opposite polarity between the two magnetic fields inside the motor cause it to turn. DC motors are the simplest type of motor and are used in household appliances, such as electric razors, and in electric windows in cars.

Why induction motor is used in traction?

An Induction motor works as a generator if mechanical speed is more than the synchronous speed. … Maximum value o regenerative tractive effort is limited to 25T and so is negative torque of the traction motor.

What is traction inverter?

Traction inverters convert dc power from an on-board high voltage (HV) battery into ac power to drive the main motor or motors of an electric vehicle. In addition, traction inverters perform functions such as voltage boosting, switch protection and regenerative braking.

What are the general features of traction motor?

Salient Features of Traction Motors

  • Designs equipped with brush-rocker assembly, terminal box and axle roller suspension bearings.
  • Polyimide film covered conductors for armature coils.
  • Armatures built with high permeability electrical sheet steel.
  • Potted field coils for better heat dissipation.

How many traction motors does a locomotive have?

1. 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.

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