Lenze DSD - Manual (Page 64)

6 Drive dimensioning tools
6.4 Cost optimisation factors
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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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6.4 Cost optimisation factors
Of course, costs are directly associated with the service factors and service durations of the individ-
ual drive components.
• Overdimensionings can render a drive system unattractive very quickly.
• Underdimensionings may make the drive system seem attractive at first. However, high follow-
up costs and damage to the company's image can occur if the drive does not perform the tasks
required.

Tip!
When carrying out dimensionings, always follow the principle "Not more and not less than
required!"
Here the user has to make the best decisions with the help of the wizard in the DSD.
• For this purpose, the following table specifies important decision parameters with regard to
costs:
Parameter Effect Notes
Gearbox size Effect on useful life
Torque overload factor of the motor Effect on motor size
Operation at least to the rated motor
speed
Effect on motor size and controllabil-
ity
Otherwise the inverter is not opti-
mally utilised
Load-matching factor K
J
Effect on control quality and dynam-
ics
Selection of optimal motion profile Can affect motor size and K
J
Selection of the correct rated motor
speed
High rated speed reduces size Observe max. permissible input
speed of the gearbox and acoustic
emission!
Selection of optimal field weakening
factor K
F
Has a considerable impact on the size
of the inverter, especially in the case
of winding drives
Use of 87 Hz operation Reduces the motor size
• In the case of winding drives, only
reasonable for a very low winding
ratio q
Selection of the switching frequency At 16 kHz only 2/3 of the rated power
Selection of 1-phase inverters at a
power of ≤2.2 kW
Is cheaper than three-phase inverters
at the same power
Selection of double-axis modules
Servo-Inverter i700
Reduced costs for inverters
DC-bus operation • Reduced mains load
• Improved energy efficiency