Beckhoff AL2000 Application Manual do Utilizador descarregar pdf (Página 10)

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Positioning

LM applications require a sophisticated position and velocity feedback. A linear encoder and a servocontroller

are taken up in the positioning system. The position of the slide is detected by a measurement unit, a ruler-

probe combination. The unit’s linear encoder returns the information to the servocontroller. The accuracy of the

motor system depends strongly on this positioning system.

Most measurement units return incremental position information. So the linear motor has to do without the

absolute position of the slide. Especially when starting a motor operation this could be problematical. Herefore

the slide is activated to some minimal testmovement. This ‘magnetic alignment’ supplies the positioning system

with the required information.

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Beckhoff AL2000 Application Manual do Utilizador Página 10