Beckhoff AL2000 Application Manuel d'utilisateur télécharger pdf (Page 21)

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Physical background

Usually a linear motor’s motion can be distinguished in 3 stages:

1. acceleration

2. constant (or maximum) velocity

3. deceleration

Below this is reperesented in a velocity-time diagram.

Velocity-time diagram for a combined or ' long motion'

During t

the accelaration takes place and during tc the velocity is constant at its maximum. The decelaration to

stand still takes place in t

. The total distance covered by the motion equals the area under the graphical draw-

ing.

During acceleration and decelaration the largest forces are displayed while the movement at constant speed

only requires the force needed to overcome friction. A linear motor that is constantly moving to and fro without

reaching its maximum velocity is thus loaded upmost. In the diagram below this situation is sketched.

Velocity-time diagram for a combined or ' short motion'

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 38 39

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Beckhoff AL2000 Application Manuel d'utilisateur Page 21