Lenze DSD - Manual (Page 164)

7 Applications
7.15 Synchronous drive of squeegees
164
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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Moment of inertia
The total moment of inertia consists of the moments of inertia of the individual components:
[7-157] Equation 5: Total moment of inertia
Torque of the application
[7-158] Equation 6: Torque of the application

Tip!
Further equations to complete the calculations required for an application can be found in
the chapter " Basic calculations ". ( 68)
7.15.1.1 Symbols used
J
sum
J J
aux
J
L
+ + =
M
App
M
sds
M
μ
J
sum
α ⋅ + + =
Symbol Description Dimension unit
d Diameter of roll 1 (drive roll) mm
F
in
Tension on input side (only positive tensile forces possible) N
F
out
Tension on output side (only positive tensile forces possible) N
F Contact pressure N
F
W2
Force due to weight of roll 2 N
F
add
Additionally acting force on roll 2 N
m
W2
Mass of roll 2 N
g Gravitational constant 9.81 m/s 2
s Safety factor - static friction %
f
1
Lever arm of the rolling friction - roll 1
f
2
Lever arm of the rolling friction - roll 2
J Moment of inertia of the lower roll (drive roll) kgm 2
J
aux
Moment of inertia of the upper roll kgm 2
J
L
Moment of inertia of the effective mass of the material to be conveyed kgm 2
J
sum
Total moment of inertia kgm 2
S Safety coefficient for the static friction %
M
App
Required torque of the application Nm
M
μ
Friction torque Nm
M
sds
Stationary torque Nm
v Speed of the web m/min
α Angular acceleration rad/s 2
β Vertical mounting position (angle of tilt) of the roll pair W
1
, W
2
, with regard
to the vertical
°
η
Brg
Mechanical efficiency of the roll bearing W
1
, W
2
μ
0
Coefficient of friction of the roll surface