Description
hardware flow control. It is an ideal choice in the field of industrial automation.
2. Principle of frequency converter
In embedded development, the control of motors is often involved. Currently, frequency conversion control of AC motors is widely used, so let”s briefly introduce the
frequency converter by looking at the diagram, assuming that you already understand the principle of the motor.
The block diagram is as follows:
The frequency converter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessing unit, etc.
The inverter relies on the switching of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage
according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter also has many protection functions.
, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converters have also been widely used.
A typical inverter system diagram is shown below. It mainly includes operation panel, VFD controller, motor and other parts.
1. Typical structure:
Mainly includes: control platform, measurement circuit, power circuit, protection circuit, etc.
There are two common types of frequency converters: voltage type and current type. Among them, the power inverter part mostly uses power
tubes such as IGBT and IGCT.
2. Typical algorithm:
Among them, the control algorithm represented by Siemens is mainly based on coordinate transformation (vector control). Friends who are
interested in the algorithm represented by ABB can search for information by themselves (direct torque control) and will not go into details here.
3. Vector control:
Many chip MCU and MPU manufacturers have provided block diagrams and algorithm libraries for variable frequency vector control. Those
who are interested can study it. For example, the following figure is a block diagram provided by Microchip
Display operation panel DSQC315
Display operation panel DSQC314B
Display operation panel DSQC313 3HAB8413-1
Display operation panel DSQC313
Display operation panel DSQC312
Display operation panel DSQC306
Display operation panel DSQC301
Display operation panel DSQC300
Display operation panel DSQC266H
Display operation panel DSQC266B
Display operation panel DSQC266A
Display operation panel DSQC260
Display operation panel DSQC259
Display operation panel DSQC258
Display operation panel DSQC256A
Display operation panel DSQC256
Display operation panel DSQC255
Display operation panel DSQC254
Display operation panel DSQC252
Display operation panel DSQC249B
Display operation panel DSQC2498
Display operation panel DSQC248
Display operation panel DSQC243
Display operation panel DSQC239 YB560103-CH
Display operation panel DSQC239
Display operation panel DSQC238
Display operation panel DSQC236U
Display operation panel DSQC236P
Display operation panel DSQC236H
Display operation panel DSQC236G
Display operation panel DSQC236D
Display operation panel DSQC236C
Display operation panel DSQC236B
Display operation panel DSQC236A
Display operation panel DSQC2360
Display operation panel DSQC235B
Display operation panel DSQC235A
Display operation panel DSQC233
Display operation panel DSQC230
Display operation panel DSQC228
Display operation panel DSQC224
Display operation panel DSQC223YB 560103-BD/4
Display operation panel DSQC223
Display operation panel DSQC215
Display operation panel DSQC211
Display operation panel DSQC210
Display operation panel DSQC209-9H
Display operation panel DSQC209
Display operation panel DSQC208A
Display operation panel DSQC208
Display operation panel DSQC206
Display operation panel DSQC205
Display operation panel DSQC205
Display operation panel DSQC202
Display operation panel DSQC202
Display operation panel DSQC202
Display operation panel DSQC201
Display operation panel DSQC201
Display operation panel DSQC140
Display operation panel DSQC140
Display operation panel DSQC129
Display operation panel DSQC129
Display operation panel DSQC125
Display operation panel DSQC125
Display operation panel DSQC124
Display operation panel DSQC124
Display operation panel DSQC123B
Display operation panel DSQC110
Display operation panel DSQC104
Display operation panel DSQC1030
Display operation panel DSQC103
Display operation panel DSQC1018 3HAC050363
Display operation panel DSQC1018
Display operation panel DSQC1018
Display operation panel DSQC1015
Display operation panel DSQC1000
Display operation panel DSPX3221
Display operation panel DSPU131 3BSE000355R1
Display operation panel DSPU120
Display operation panel DSPC452 57310303-A
Display operation panel DSPC406
Display operation panel DSPC406
Display operation panel DSPC365
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