Lenze DSD Manual de usuario descargar pdf (Pagina 322)

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11 Drive Dimensioning

11.2 Motor selection

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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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11.2.8.1 Required acceleration torque

The following diagram shows the required relative acceleration torque as a function of the k

factor,

the coloured representation using traffic-light colours giving a rough guide value for optimum sys-

tem properties of motion drives.

[11-6] Required acceleration torque as a function of k

•As the K

factor becomes higher, the load becomes the increasingly dominant portion of the mo-

ments of inertia, and a larger motor will only slightly reduce the acceleration capability, but will

simultaneously provide improved control-loop quality and system stability.

• A load-matching factor of k

= 1 produces the minimum size of a drive.

11.2.8.2 Factors for the stability and quality of control

However, the control stability and quality not only depends on the k

factor, but also on other fac-

tors, such as:

• Clearance in the gearbox, in the clutch, etc.

• Elasticity in the gearbox, in the clutch, etc.

• Triggering of the mechanical self-exciting frequency of the application

• Damping of the gearbox

•Load alternation

 Tip!

In this case, precise values can only be provided by a test or a simulation of the application

with required known parameters.

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