Siemens SINUMERIK 840DiE sl Manual page 524

A Small SINAMICS Glossary
Servo drive
SITOP power
Smart line module
Status word
Vector control
A-524
An electric servo drive comprises a motor, a –> "Motor Module", a –> "Servo
Control" and, in most cases, a speed and position –> "Encoder". Electric servo
drives are normally extremely precise and have a high dynamic response. They
are designed for cycle times to less than 100 ms, and often have a short–time
overload capacity, which enables quick acceleration. Servo drives are available
as rotary and linear drives and are used for machine tools, handling robots, and
packaging machines.
–> "Electronic power supply" component. Example: 24 V DC
Unregulated line infeed/feedback unit with a diode bridge for the infeed and
stall–protected, line–commutated feedback via –> "IGBT"s. The Smart Line
Module supplies the DC link voltage for the –> "Motor Module"s.
Bit–coded –> "Process data" word. –> which "PROFIdrive" transmits at cyclic
intervals to control the drive states.
Vector control (field–oriented control) is a high–performance control type for
induction machines. It is based on an exact model calculation of the motor and
two current components that simulate and accurately control the flux and torque
by means of software algorithms, thereby enabling predefined speeds and
torques to be observed and limited accurately and with a good dynamic
response. Two vector control types exist: The frequency control (–> "Sensor-
less vector control") and the speed–torque control with speed feedback
(–> "Encoder").
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
01/2007
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