Overview Of Motor Control Methods - Omron RX2 Series User Manual

7-1

Overview of Motor Control Methods

Select an appropriate motor control mode for the motor to be driven and the control method.
When you drive an induction motor (IM), set [AA121]=00 to 10.
Set [AA121] = 11 or 12 to drive a synchronous motor (SM)/permanent magnet motor (PMM).
The characteristics of the control operation may be improved by automatic tuning.
Whether the currently-selected mode is the control mode for induction motors or that for synchronous
motors (SMs)/permanent magnet motors (PMMs) can be checked by [dC-45] IM/SM(PMM) monitor.
Precautions for Correct Use
• As improper settings for a given motor result in performance below its potential characteris-
tics, be sure to set up appropriately.
• See 6-2 Parameter Setting for Motor Related on page 6-8 for checking.
• To drive multiple induction motors (IMs) by a single inverter, it is recommendable to use it
with V/f control's constant torque characteristics.
• An exemplar selection of control mode will be shown in the following section. Some of your
systems may have more suitable modes than what is selected as the example.
 Parameter
Item
Control mode
selection,
1st-motor
IM/SM monitor
*1. Cannot be selected if [Ub-03] duty spec selection is 01 (LD) or 00 (VLD).
*2. Cannot be selected if [Ub-03] duty spec selection is 00 (VLD).
Note IM: Induction motor
SM (PMM): Synchronous motor (permanent magnet motor)
High-function General-purpose Inverter RX2 Series User's Manual
Parameter Data
00
01
02
03
04
05
06
[AA121]
07
08
09
10
11
12
00
[dC-45]
01
Description
V/f control-constant torque characteristics (IM)
V/f control-reducing torque characteristics (IM)
V/f control-free V/f (IM)
Automatic torque boost (IM)
V/f control-constant torque characteristics (IM)
with sensor
V/f control-reducing torque characteristics (IM)
with sensor
V/f control with sensor-free V/f (IM)
Automatic torque boost (IM) with sensor
Sensorless vector control (IM)
Zero-Hz range sensorless vector control (IM)
Vector control (IM) with sensor
Synchronous-start type sensorless vector con-
trol (SM/PMM)
IVMS-start type sensorless vector control
*2
(SM/PMM)
Induction motor IM being selected.
Synchronous motor SM (permanent magnet
motor PMM) being selected.
7 Advanced Settings
Default
data
00
*1
*1
-
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