Lenze DSD - Manual (Page 115)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
115
7 Applications
7.8 Hoist drive without counterweight
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Minimum/maximum diameter
If a cable drum is used a minimum and maximum diameter for the dimensioning has to be deter-
mined.
• The following illustration shows the parameters required for the calculation for a cable drum:
[7-77] Example: Cable drum
For the determination of the required speed n
max
at the required lifting speed v, the minimum ef-
fective reel diameter d
min
has to be specified:
[7-78] Equation 2: Minimum diameter
For the determination of the moments of inertia and the stationary torque the maximum effective
diameter d
max
is required. For this the number of cable layers on the drum at maximum lifting
height has to be determined.
If we assume that the reel diameter increases by the cable thickness (d
Rop
) with every winding layer,
the achievable height h
N
per winding layer N
Cor
can be calculated by means of the equation below:
[7-79] Equation 3: Achievable height for the winding layer N
Cor
The winding layer N
Cor
(Δh) can be calculated depending on h
hoi
using the following equa-
tion:
[7-80] Equation 4: Winding layer N
Cor
(Δh)
The winding layer N
Cor
which only exists as integer thus results from the rounded up value of
N
Cor
(Δh):
[7-81] Equation 5: Winding layer N
Cor
The maximum effective diameter d
max
of the cable drum is calculated according to the following
equation:
d
Cor
d
Rop
b
Cor
d
Min
d
Cor
d
Rop
+ =
h
N
b
Cor
d
Rop
----------- π d
Cor
d
Rop
+ 2 N
Cor
1 – ⋅ ( ) ⋅ [ ] ⋅ ⋅
N
L
1 =
N
Cor 
=
N
Cor
Δh ( )
d
Cor
2 d
Rop
⋅
-------------------
 
 
 
2
h
hoi
1000 N
L
⋅ ⋅
π b
Cor
⋅
--------------------------------------- +
d
Cor
2 d
Rop
⋅
------------------- – =
N
Cor
N
Cor
Δh ( ) =