Lenze DSD Manual do Utilizador descarregar pdf (Página 345)

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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 345

11 Drive Dimensioning

11.5 Selection of an additional drive element

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11.5.5 Permissible torque

11.5.6 Constant torque loss

For applications actuated via belts or chain, torque-dependent, speed-dependent, and constant

losses occur:

• In comparison to the other losses, the speed-dependent losses are small and are thus are com-

bined with the constant losses.

• Partly there is a high pretension which causes great bearing forces and friction losses between

the belt or chain and the pinion.

• These losses in the DSD are combined as constant, load-independent losses.

• The proportion of these losses with regard to the total losses is entered under M

th,K

[11-16] Definition of the constant, load-independent losses (M

th,K

)

Symbol Description

per,out,K

Permissible torque at the output end of the additional drive element

• This torque is used for the determination of the maximum constant loss from the efficiency.

• Due to the high pretension, belt drives have constant friction losses.

• The friction torque depends on the parameters of the belt (e. g. width, material, tensile mem-

ber used). These parameters also affect the permissible torque to be transmitted.

Constant torque loss

( 345)

Symbol Description

th,K

Constant torque portion resulting from the losses of the prestressed belt.

• Relative to the output end.

• The following applies:

th,K

1 η

–()M

per,K

⋅≤

th,K

out

per,K

1 2 ... 340 341 342 343 344 345 346 347 348 349 350 ... 495 496

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