Parker EME
Setting up Compax3
192-120113 N08 C3I12T11 - December 2010
279
4.4.9.8
Basics of frequency response measurement
In this chapter you can read about:
Distinction between signals and systems ....................................................................... 279
Linear Systems (LTI System) ........................................................................................ 280
Mechanical system ........................................................................................................ 281
Resonance points and their causes ............................................................................... 282
In the drive and control technology, the display of signals and systems in the
frequency range is often the best possibility to solve different tasks.
Distinction between signals and systems
Defined objects and their interactions that can be combined to a whole by a
plausible distinction from their environment (i.e. the complex reality) are called a
system.
Example electric motor
This consists of a multitude of different components, but the function and the
behavior of a motor can be described as a whole without describing each individual
component and their interactions separately.
If the motor is energized, it will generate a torque at the motor shaft.
Electro
Motor
Current
Strom
Torque
Drehmoment
Input
Eingangs
Signal
System
Ouput
Ausgangs
Signal
Current is therefore a signal, which causes at the input of the system motor a
change of its torque output signal.
In order to register and process such signals in the controller, they are digitized and
read in with the so-called scanning frequency (fA). Thus the physical signal was
converted into a finite sequence of numbers, which can be processed in the
controller.
