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Electric Locomotive

Specific Energy Consumption of High Speed Rail as compared to Semi-HSR

By on October 20, 2013
Specific Energy Consumption of High Speed Rail as compared to Semi-HSR

There is a general belief that the train resistance (resulting high specific energy consumption) of high-speed train is high as compared to normal speed train. The UIC sponsored study proved it otherwise with following arguments explained in the discussion Curve Resistance: High speed Rail routes had to be straighter, a must for the high-speed route, […]

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Current Developments in the field of Traction motors

By on July 5, 2013

SINGAPORE Mass Rapid Transit Corporation (SMRT) has awarded a contract worth more than Yen 8bn ($US 80.5m) to Toshiba, Japan, to re-equip a fleet of 66 six-car metro trains with permanent-magnet synchronous traction motors. The new motors are being fitted as part of the refurbismet of the existing drive equipment, the first such upgrade since […]

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Suspension System

By on May 16, 2013
Suspension System

The track irregularities and their interaction with wheel generate vibration of varying amplitude and frequency. These vibrations may cause damage to different parts of the vehicle if not contained and also return it back to the track. These vibrations are contained by suspension arrangement. Elements of suspension system are Elastic Element (Helical Spring) Damper, Constraints […]

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Axle Box

By on May 16, 2013

Axle Box A device which supports weight of the vehicle and transfer it to wheel and permits its rolling as well as longitudinal motion. Axle box transmits longitudinal, lateral and vertical forces from wheel set to other parts of the suspension system Axle Box consists of housing with removable front cover, bearing plain(now obsolete) or […]

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Wheel Sets

By on May 16, 2013
Wheel Sets

A wheel set consists of two wheels rigidly connected by a common axle and provides Necessary distance between track and vehicle to support equipment mounted on under-frame Guidance for motion to contain within track gauze Transfer of vertical load to the rail Transfer of tractive and braking effort to rail It’s design depends upon Type […]

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Suspension System of Railway Vehicle

By on May 15, 2013
Suspension System of Railway Vehicle

Movement of Railway vehicle on Rail is a guided movement, different as compared to road. This system is complex with having many degrees of freedoms making the study of vehicle dynamics a challenging subject from the beginning of industrial revolution Mechanical system provides Transfer and balancing of vertical Load Guidance and automatic steering of vehicle […]

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Traction Mechanics – Numerical Problems

By on May 12, 2013

  Q 1: A train weighing 5000T   starts by a locomotive weighing 125T. The starting resistance of locomotive and train are 6 & 4kg/T respectively. What is the total train resistance at the start? 5000*4+125*6=20750Kg Ans:       =20.75T   Q 2 : A train weighting 1500T is moving on a flat and straight territory at […]

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Permanent Magnet Synchronous Motor

By on May 12, 2013

  Permanent Magnet synchronous motor popularly called PMSM uses rare earth permanent magnet at the rotor as compared to field winding. With recent advancements of permanent magnet, solid state devices and micro-electronics have helped in making use of this motor for traction purpose. To begin with, this motor has found more and more automotive application […]

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Synchronous Motor as Traction Motor

By on May 12, 2013
Synchronous Motor as Traction Motor

Synchronous machines are used as Generator or Condenser motor and never as traction motor before advent of variable frequency drives. The motor consists of stater equipped with three phase stater winding and rotor with DC field excitation. DC field may be with salient or non-salient poles or with permanent magnet. Three phase synchronous motor cannot start at its rated […]

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Three Phase Induction Motor as Traction Motor

By on May 12, 2013
Three Phase Induction Motor as Traction Motor

Right from the introduction of electric traction, there was a strong desire to use Three phases Induction Motor for Traction application. This could only be possible with the introduction of variable voltage variable frequency control. Working Principle of Three Phase Induction Motor AC induction motor is equivalent to Transformer where secondary is short circuited and […]

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