Lenze DSD - Manual (Page 141)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
141
7 Applications
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
η
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
η
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
d
Brg
The diameter for calculating the bearing friction.
Symbol Description
J
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 ( 407)