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 SPBLK01
Display operation panel SPBLK01
Display operation panel SPA-ZC22
Display operation panel SPA-ZC22
Display operation panel SPA-ZC21
Display operation panel SPAU140C
Display operation panel SPAU140C
Display operation panel SPASO11
Display operation panel SPASO11
Display operation panel SPASO11
Display operation panel SPASO11
Display operation panel SPASI23
Display operation panel SPASI23
Display operation panel SPASI23
Display operation panel SPASI23
Display operation panel SPASI23
Display operation panel SPAM150C
Display operation panel SPAD346C3
Display operation panel SPAD346C
Display operation panel SPAD346C
Display operation panel SPAD346C
Display operation panel SPAD330C
Display operation panel SNAT7261 PCP
Display operation panel SNAT7261
Display operation panel SNAT634PAC
Display operation panel SNAT617CHC
Display operation panel SNAT617CHC
Display operation panel SNAT607MCI
Display operation panel SNAT605SDB
Display operation panel SNAT603CNT/61007041
Display operation panel SN:4910391523
Display operation panel SMU-03 3HNA03638-001/01
Display operation panel SMU-03 3HNA024411-001/00
Display operation panel SMU-03 3HNA013638-001/02
Display operation panel SMS01
Display operation panel SMB-01 3HNA006142-001
Display operation panel SM811K01 3BSE018173R1
Display operation panel SM811K01
Display operation panel SM811K01
Display operation panel SM811
Display operation panel SM810K01
Display operation panel SLC01-RE
Display operation panel SK829007-B
Display operation panel SK829007-B
Display operation panel SK829007-B
Display operation panel SK616001-A
Display operation panel SK616001-A
Display operation panel SINT4611C
Display operation panel SINT4510C
Display operation panel SER-740
Display operation panel SE99182066 DSDP170
Display operation panel SE96920414 YPK112A
Display operation panel SE96920414 YPK112A
Display operation panel SDN20-24-100C
Display operation panel SDN20-24-100C
Display operation panel SDI-03 3HNA001582-001/02
Display operation panel SDi-03 3HNA001582-001
Display operation panel SDCS-SNAT624
Display operation panel SDCS-POW-4-SD
Display operation panel SDCS-POW-4
Display operation panel SDCS-POW-1C
Display operation panel SDCS-POW-1
Display operation panel SDCS-PIN-4B
Display operation panel SDCS-PIN-48-SD
Display operation panel SDCS-PIN-48-SD
Display operation panel SDCS-PIN-48-COAT
Display operation panel SDCS-PIN-4
Display operation panel SDCS-PIN-205B
Display operation panel SDCS-PIN-205B
Display operation panel SDCS-IOE-2C
Display operation panel SDCS-IOE-1
Display operation panel SDCS-FEX-4A
Display operation panel SDCS-FEX-4
Display operation panel SDCS-FEX-2A
Display operation panel SDCS-CON-4
Display operation panel SDCS-CON-4
Display operation panel SDCS-CON-2B
Display operation panel SDCS-CON-2A
Display operation panel SDCS-CON-2A
Display operation panel SDCS-CON-2
Display operation panel SDCS-CON-1
Display operation panel SDCS-COM-81
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