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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 141

7Applications

7.11 Roller conveyor

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7.11.2.2 Leverage of rolling friction

7.11.2.3 Chain efficiency

7.11.2.4 Bearing diameter

7.11.2.5 Moment of inertia of transport rollers

Symbol Description

f The lever arm of the rolling friction serves to calculate the friction force.

• Value can be entered directly or selected from the "Physical coefficients" table.

Lever arm of rolling friction

Symbol Description

Chn

Values for the efficiency η

Chn

per complete wrap:

Chain = 0.90 - 0.96 (depending on the chain size)

Toothed belt = 0.96 - 0.98 (depending on the material)

Flat belt = 0.93 - 0.98 (depending on the material)

V-belt = 0.88 - 0.95

Rubber strap = 0.80 - 0.85

Non-metallic strap = 0.80 - 0.85

Wire rope = 0.90 - 0.95

 Note!

When the power is transmitted from the drive to the transport rollers, the efficiency

Chn

of the chain is reduced with every chain wrap.

•The efficiency η

Chn

exponentiates with the number of chain wraps N

Chn

• Position the drive centrally if necessary to distribute the power transmission to two

paths. That way, the number of chain wraps per path is also reduced.

• Realistic values must be assumed for the efficiency η

Chn

Symbol Description

Brg

The diameter for calculating the bearing friction.

Symbol Description

aux

Moment of inertia of the transport rolls, shafts, etc.

• Has an impact on the dynamic torque!

• Value can be entered directly or calculated using the inertial calculator.

Inertial calculator

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