Chapter: Electric Energy Generation and Utilisation and Conservation - Electric Drives and Traction

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Mechanics of train movement

Essential driving mechanism of an electric locomotive is shown in fig. The armature of the driving motor has a pinion diameter d‟ attached to it. The tractive effort at the edge of the pinion is transferred to the driving wheel by means of a gear wheel.

Mechanics of train movement:

 

 

Essential driving mechanism of an electric locomotive is shown in fig. The armature of the driving motor has a pinion diameter d attached to it. The tractive effort at the edge of the pinion is transferred to the driving wheel by means of a gear wheel.

 

Tractive effort transferred tot the driving is given by the expression.

 

F = = η F (d/D0 = η 2T/D) = ηT (2/D) (d/d) = ηT 2y/D

 

Where T is the torque exerted in N-m, by the driving motor, d is the diameter of gear wheel in metres. D is the diameter of driving wheel in metres, η is the transmission efficiency and γ is the gear ratio and is equal to d/d

 

For obtaining train motion without slipping tractive effort F should be less than or at the most equal to µW where µ the coefficient of adhesion between the wheel is and the track and W is the weight of the train on the driving axles (called the adhesive weight).




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