Lenze DSD Manuel d'utilisateur télécharger pdf (Page 178)

100

101

7Applications

7.19 Fan

178

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

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Required torque of the fan

From the data entered and the load characteristic selected the DSD calculates the required torque.

[7-174] Load characteristics of the fan

Calculation of the torque for a quadratic load characteristic (M ≈ n²):

[7-175] Equation 3: Torque for a quadratic load characteristic

Calculation of the torque for a constant load characteristic (M ≈ constant):

[7-176] Equation 4: Torque for a constant load characteristic

 Tip!

Further equations to complete the calculations required for an application can be found in

the chapter "Basic calculations

". ( 68)

• The host computer "Energy efficiency fan/pump" serves to compare the energy de-

mand in an inverter-controlled and mechanically controlled system.

 Constant characteristic (M ≈ constant)

 Square-law characteristic (M ≈ n²)

 Rated point of the fan

App

Vlt

---------







add

α⋅+







⋅=

App

add

α)⋅(+=

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Lenze DSD Manuel d'utilisateur Page 178

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