Lenze DSD - Manual (Page 118)

7 Applications
7.8 Hoist drive without counterweight
118
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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Required speed
For the determination of the required speed (n) of the cable drum apart from the previously men-
tioned parameters the required lifting speed (v) has to be specified:
[7-91] Equation 15: Speed of the cable drum

Tip!
Further equations to complete the calculations required for an application can be found in
the chapter " Basic calculations ". ( 68)
7.8.1.1 Symbols used
n
60
2 π ⋅
----------- v
60
------
N
L
2000 ⋅
d
Min
------------------------ ⋅ ⋅ =
Symbol Description Dimension unit
b
Cor
Width of cable drum mm
d
Cor
Diameter of cable drum mm
d
max
Maximum effective diameter of cable drum mm
d
min
Minimum effective diameter of cable drum mm
d
Rop
Cable diameter mm
g Gravitational acceleration (g = 9.81 m/s 2 ) m/s 2
h
hoi
Lifting height for the determination of the winding layers m
Δh Height difference for the determination of the stationary torque m
h
N
Achievable height for winding layer N m
J
add
Additional moment of inertia (e. g. by the cable drum) kgm 2
J Stationary moment of inertia without payload mass kgm 2
J
sum
Total moment of inertia with payload mass kgm 2
N
Cor
Number of winding layers on the cable drum
N
L
Reeving of the pulley block with regard to the payload
l
Rop
Cable length m
m
L
Mass of the payload kg
m
Cbn
Mass of the hoisting cage for the payload kg
m
Rop
Cable mass kg
m
acv,Rop
Active cable mass (for stationary torque) kg
m
sum
Total mass kg
M
App
Required torque of the application Nm
M
sds
Stationary torque Nm
M
th
Torque loss Nm
n Speed of the cable drum rpm
v Lifting speed of the payload m/min
α Angular acceleration rad/s 2
η
Gdn
Shaft efficiency
η
Pll
Efficiency of the cable rolls
η
Cor
Efficiency of the cable drum
ρ
Rop
Specific cable weight kg/dm 3