Lenze DSD User Manual download pdf (Page 68)

7Applications

7.2 Basic calculations

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

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7.2 Basic calculations

In this chapter the basic calculations required for ascertaining the requirement of the application

are described. The initial situation results from the calculations which have to be carried out for the

respective application (e. g. travelling drive).

The requirement of the application results from

• The torque required,

• The speed required,

• The power resulting from the two.

7.2.1 Torque

To dimension the drive system correctly, the torque of the application is required. It should be cal-

culated completely for the application, taking the losses (e. g. friction) into consideration. A division

into a dynamic and a stationary component cannot be effected, as the friction partly has an effect

on dynamic components, and to some extent it has not.

For instance, in the case of a spindle, due to the linearly moved masses losses are created with re-

gard to the dynamic forces, and due to the moment of inertia of the spindle the dynamic torques act

on the drive system without losses. Furthermore the losses depend on different factors depending

on the application. It is therefore assumed that the required torque of the application M

app

is given:

[7-1] Equation 1: Total torque of the application

 Tip!

The equation for calculating the torque can be found in the chapter for the respective ap-

plication model.

Basically the total requirement of the torque results from the following.

• The dynamic torque of the application results from the multiplication of the moment of inertia

and the angular acceleration:

[7-2] Equation 2: Dynamic torque of the application

• The stationary torque M

sds

is calculated on the basis of the application-specific equations that

are listed in the chapter for the respective application model.

• The total torque of the application results from adding the dynamic and the stationary compo-

nent:

[7-3] Equation 3: Total torque of the application

sum

app

dyn

J α⋅=

sum

dyn

sds

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