Lenze DSD - Manual (Page 107)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
107
7 Applications
7.7 Wheel drive
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7.7.1 Calculations
For a wheel drive according to the drawing the following applies:
Moment of inertia
The moment of inertia J
Car
is the part of inertia which does not change during the processing cycle,
e. g. mass of the vehicle (m
Car
), axes, and wheels.
[7-63] Equation 1: Moment of inertia of the vehicle
The part of the payload mass (m
L
) is added. This mass can adopt different values within the process-
ing cycle.
[7-64] Equation 2: Total moment of inertia
Stationary torque
The ascertainment of the stationary torque is based on the determination of the vehicle travelling
resistance. It can consist of the proportion of rolling friction, bearing friction, and wheel flange and
lateral friction. Additionally tensile and hoisting forces can act.
[7-65] Equation 3: Total mass
[7-66] Equation 4: Stationary torque
[7-67] Equation 5: Friction torque
[7-68] Equation 6: Counter-torque
[7-69] Equation 7: Lifting torque
J
Car
J
add
d
Whl
2000
-------------
 
 
2
m
Car
⋅ + =
J
sum
J
Car
d
Whl
2000
-------------
 
 
2
m
L
⋅ + =
m
sum
m
Car
m
L
+ =
M
sds
M
μ
M
vs
M
g
+ + =
M
μ
m
sum
g v
v
-----
f
1000
------------- β cos
d
Brg
2000
------------- + μ
1
d
Whl
2000
------------- c ⋅ + ⋅ ⋅
 
 
⋅ ⋅ ⋅ =
M
vs
F
vs
d
Whl
2000
------------- ⋅ =
M
g
m
sum
g β sin
d
Whl
2000
------------- ⋅ ⋅ ⋅ =