Application Manual CDA3000
6-3
6 Control modes
1
2
3
4
5
6
A
DE
EN
FR
General points on operation of three-phase AC motors with
frequency inverters
Figure 6.1 Characteristic of speed curves
Three-phase AC machines are executed in synchronous and asynchro-
nous design. Their stator windings are arranged and their electrical
properties designed such that in operation in a three-phase AC system a
rotating field is created in the motor which drives the rotor.
Speed manipulating range M = M
Nom
1:20 1:50 >1:10000
Static speed accuracy
typically 1 to 5%
2)
typically 0.5%
2)
quartz accurate
2)
Frequency resolution 0.01 Hz 0.0625 Hz
2
-16
Hz
Motor principle
asynchronous
synchronous
reluctance
asynchronous asynchronous
1)
I
Inverter
= 2
.
I
Motor
2)
referred to nominal speed
Characteristics
VFC
Voltage/Frequency
Control
SFC
Sensorless Flux
Control
FOR
Field-Oriented
Regulation
Tabelle 6.1 Motor control method
A
Basic
manipulating
Field
weakening
range
const.
const.
To Next Page
Loading...
