Siemens SIMOVERT MASTERDRIVES Manual page 859

Engineering Information
A typical planning
sequence
NOTE
11.1 Clarification of the type of drive, technical data and other
border conditions
11-2
The planning of a cycle-type drive, i.e. the selection of the motor,
converter/inverter and perhaps the rectifier unit, is carried out in the
following sequence:
1. Clarification of the type of drive, technical data and other border
conditions
2. Specification of the travel curve
3. Calculation of the maximum speed under load and the maximum
load torque, selection of the gear
4. Selection of the motor
5. Selection of the converter or inverter
6. Selection of the rectifier unit if multi-axis drives are used
7. Selection of the braking unit and the braking resistor
8. Selection of other components.
Steps 2 to 8 of the above sequence can be conveniently carried out
with the aid of the "PFAD" planning program. In particular, this method
simplifies the optimization of the drive, which would otherwise entail a
great amount of calculation work.
The procedure for calculating the load torque depends on the type of
drive. It may be a travel drive, a lifting drive, a turntable drive or a
spindle drive. In the case of linear motion, for example, power can be
transmitted via a toothed belt, a gear rack, a spindle or via friction.
Normally, a further set of gears is also needed for adapting the motor
speed and the motor torque to the load conditions.
For this calculation, the necessary technical data must be available,
such as the moving masses, diameter of the drive wheel/pinion or the
diameter and pitch of the spindle, details of the frictional resistance,
mechanical efficiency, maximum speed, maximum acceleration and
maximum deceleration, travel distances and times and the accuracy
levels for positioning. If the drive consists of several motors with the
same load distribution which are each operated as individual drives on
a converter/inverter, the conditions for one motor have to be taken into
consideration in each case when dimensioning the drive (moving
masses, load-side moments of inertia, additional forces/torques divided
by the number of motors).
6SE7087-6QX70 (Version AE)
Compendium Motion Control
06.2005
Siemens AG
SIMOVERT MASTERDRIVES