06.2005 Engineering Information
Siemens AG 6SE7087-6QX70 (Version AE)
SIMOVERT MASTERDRIVES Compendium Motion Control 11-1
11 Engineering Information
Servo drives are mostly cycle-type drives, i.e. drives which perform
particular sequences of movement within a fixed cycle of motion. These
movements can be linear or rotational. In addition, the motion sequence
usually involves approaching a pre-defined position and all movements
must be carried out in the shortest time possible. As a consequence,
drives have to meet specific requirements. They must be
♦ dynamic, i.e. move to the desired position in an optimum time and
without overshoot
♦ overload-capable, i.e. have a high acceleration reserve
♦ and must have a large control range, i.e. high resolution for exact
positioning.
The planning notes below refer to servo drives with 1FK6/1FT6
synchronous servomotors or with 1PA6 induction servomotors. The
type of motor which is selected, either synchronous or induction,
depends on the requirements of the drive and on the required drive
power. Synchronous servomotors are preferred where a small unit
volume, low rotor inertia, high overload capability and thus fast
response levels are important. Induction servomotors are of simpler
design and are therefore very sturdy. They only require a pulse encoder
instead of an encoder or a resolver. Induction servomotors are offered
with ratings up to 160 kW.
Which components are selected from the Motion Control system
depends on the type of drive configuration used. The drives can be
operated individually, for example, as single-axis drives or together as
multi-axis drives. For connecting the drives to a PLC, via PROFIBUS
for example, supplementary boards may be necessary. Decentralized
provision of technology functions within the Motion Control system is
possible with special software or the functions can be provided centrally
by means of a PLC. Drives can be coupled, e.g. for angular
synchronism, via SIMOLINK.
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