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
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3500/92 136180-01 Transient Data Interface BENTLY
3500/05-02-04-00-00-00 BENTLY vibration monitoring system
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135613-01-00 BENTLY4 Channel Relay Module
3500/22M 138607-01 BENTLY overspeed protection module
3500/42M 176449-02 Temperature monitor BENTLY
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176449-09 BENTLY4 Channel Relay Module
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125840-01 Transient Data Interface BENTLY
3500/72-01-00 Temperature monitor BENTLY
1701/10-01 BENTLY overspeed protection module
3500/25 149369-01 BENTLY overspeed protection module
106M1081-01 BENTLY4 Channel Relay Module
3500/20 125744-01 Temperature monitor BENTLY
3500/93 135799-01 Temperature monitor BENTLY
1900/65A 167699-02 Transient Data Interface BENTLY
3500/40M 176449-01 BENTLY4 Channel Relay Module
3500/33 149986-01 Temperature monitor BENTLY
135799-01 BENTLY vibration monitoring system
125800-01 BENTLY overspeed protection module
3500/20 125744-01 BENTLY4 Channel Relay Module
3500/93 135785-02 BENTLY vibration monitoring system
3500/15-05-05-CN BENTLY overspeed protection module
3500/15-05-05-00 Transient Data Interface BENTLY
149992-01 BENTLY4 Channel Relay Module
3500/92-04-01-00 Temperature monitor BENTLY
9200-06-02-10-00 BENTLY vibration monitoring system
125680-01 BENTLY vibration monitoring system
3500/40 176449-01 Transient Data Interface BENTLY
136719-01 BENTLY overspeed protection module
3500/22M Temperature monitor BENTLY
3500/50 133388-02 Temperature monitor BENTLY
3500/77M 176449-07 BENTLY overspeed protection module
3500/15 127610-01 BENTLY4 Channel Relay Module
3500/53 133388-01 BENTLY vibration monitoring system
79492-01 BENTLY vibration monitoring system
3500/92-04-01-00 Transient Data Interface BENTLY
1900/65A 167699-02 Temperature monitor BENTLY
3500/42M-04-CN BENTLY overspeed protection module
3500/15 106M1079-01 BENTLY4 Channel Relay Module
125680-01 BENTLY vibration monitoring system
3500/93 135785-01 BENTLY4 Channel Relay Module
3500/42M 140734-02 Transient Data Interface BENTLY
3500/92 136180-01 BENTLY overspeed protection module
136719-01 BENTLY4 Channel Relay Module
3500/15 127610-01 BENTLY overspeed protection module
128277-01 BENTLY overspeed protection module
3500/42M 176449-02 BENTLY overspeed protection module
3500/22M 138607-01 BENTLY4 Channel Relay Module
1900/65A 167699-02 BENTLY overspeed protection module
3500/20 125760-01 Transient Data Interface BENTLY
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