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 EI812F
Display operation panel EI812F
Display operation panel EI811F-Z
Display operation panel EI811F
Display operation panel EI811F
Display operation panel EI803F
Display operation panel EI803F
Display operation panel EI802F
Display operation panel EI801F
Display operation panel EHDB280-21-11
Display operation panel EHDB280
Display operation panel EHDB280
Display operation panel EHDB220-21-11
Display operation panel EHDB130
Display operation panel EHDB130
Display operation panel EH450C-1
Display operation panel E5EAA HENF105240R1
Display operation panel E3ES
Display operation panel E3EP HENF315276R1
Display operation panel E3EFa HENF452750R1
Display operation panel E3EC HENF315125R1
Display operation panel E3EB HENF315129R1
Display operation panel DX910S
Display operation panel DX910S
Display operation panel DX910N
Display operation panel DX910B
Display operation panel DX731F
Display operation panel DX722F
Display operation panel DX581-S
Display operation panel DSVC113
Display operation panel DSU462
Display operation panel DSU461
Display operation panel DSU451
Display operation panel DSU45
Display operation panel DSU223
Display operation panel DSU14
Display operation panel DSU14
Display operation panel DSU10
Display operation panel DSU10
Display operation panel DSTYW121 3BSE007836R1
Display operation panel DSTXN001-0
Display operation panel DSTX170
Display operation panel DSTX152
Display operation panel DSTX151
Display operation panel DSTX150
Display operation panel DSTX001
Display operation panel DSTV110
Display operation panel DSTS106 3BSE007287R1
Display operation panel DSTS105 3BSE007286R1
Display operation panel DSTS104 3BSE007285R1
Display operation panel DSTK179
Display operation panel DSTK176
Display operation panel DSTK155
Display operation panel DSTK152
Display operation panel DSTK151V
Display operation panel DSTK126
Display operation panel DSTK114
Display operation panel DSTD-W150
Display operation panel DSTDN001
Display operation panel DSTD310
Display operation panel DSTD306
Display operation panel DSTD160
Display operation panel DSTD155
Display operation panel DSTD150A
Display operation panel DSTD150A
Display operation panel DSTD150
Display operation panel DSTD150
Display operation panel DSTD120
Display operation panel DSTD110A
Display operation panel DSTD110A
Display operation panel DSTD110
Display operation panel DSTD108P
Display operation panel DSTD108 ABB
Display operation panel DSTD108
Display operation panel DSTD108
Display operation panel DSTC456
Display operation panel DSTC456
Display operation panel DSTC454
Display operation panel DSTC190
Display operation panel DSTC176
Display operation panel DSTC175 57310001-KN
Display operation panel DSTC160
Display operation panel DSTC130
Display operation panel DSTC121
Display operation panel DSTC110
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