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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SS832 3BSC610068R1 | ABB | Power Voting Unit, ABB S800 I/O
SD833 3BSC610066R1 | ABB | Power Supply Device, ABB S800 I/O
SD832 3BSC610065R1 | ABB | Power Supply Device, ABB S800 I/O
PM573-ETH ABB Programmable Logic Controller
DP840 3BSE028926R1 ABB Pulse Counter S/R 8 ch, ABB S800 I/O
DP820 3BSE013228R1 ABB Pulse Counter RS-422 Current, 5 V, (12 V), 24 V, ABB S800 I/O
DO890 3BSC690074R1 ABB DO890 Digital Output 4×1 ch with Intrinsic Safety Interface, ABB S800 I/O
DO821 3BSE013250R1 ABB Digital Output Relay 8×1 ch, ABB S800 I/O
DO840 3BSE020838R1 ABB Digital Output 24V S/R 16 ch, ABB S800 I/O
DO815 3BSE013258R1 ABB DO815 Digital Output 24 V d.c 2×4 ch, ABB S800 I/O
TU835V1 3BSE013236R1 ABB compact module
DO814 3BUR001455R1 ABB Digital Output current sinking 2×8 ch, ABB S800 I/O
DI890 3BSC690073R1 ABB Digital Input 8×1 ch with Intrinsic Safety Interface, ABB S800 I/O
DI885 3BSE013088R1 ABB Digital Input 24/48V SOE 8 ch, ABB S800 I/O
DI840 3BSE020836R1 ABB Digital Input 24V S/R 16 ch, ABB S800 I/O
DI831 3BSE013212R1 ABB Digital Input 48 V d.c. SOE 2×8 ch, ABB S800 I/O
DI830 3BSE013210R1 ABB Digital Input 24 V d.c. SOE 2×8 ch, ABB S800 I/O
DI825 3BSE036373R1 ABB Digital Input 125 V d.c. SOE 1×8 ch, ABB S800 I/O
DI821 3BSE008550R1 ABB Digital Input 230 V a.c. 8×1 ch, ABB S800 I/O
DI814 3BUR001454R1 ABB Digital Input 24 V d.c. Current Source 2×8 ch, ABB S800 I/O
DI820 3BSE008512R1 ABB Digital Input 120V a.c. 8 ch, ABB S800 I/O
DI811 3BSE008552R1 ABB Digital input 48 V d.c. 2×8 ch, ABB S800 I/O
AO895 3BSC690087R1 ABB Analog Output IS HART 8 ch, ABB S800 I/O
AO890 3BSC690072R1 ABB Analog Output IS 8 ch, ABB S800 I/O
AO845A 3BSE045584R1 ABB Analog Output 4×1 ch, ABB S800 I/O
AO815 3BSE052605R1 ABB Analog Output 1×8 ch with HART, ABB S800 I/O
AI895 3BSC690086R1 ABB Analog Input 8 ch with Intrinsic Safety and HART, ABB S800 I/O
AI893 3BSE023675R1 ABB Analog Input TC/RTD IS 8 ch, ABB S800 I/O
AI890 3BSC690071R1 ABB Analog Input 1×8 ch with Intrinsic Safety Interface, ABB S800 I/O
AI845 3BSE023675R1 ABB Analog Input, Redundant or single 1×8 ch HART, ABB S800 I/O
AI843 3BSE028925R1 ABB Analog Input, Redundant or Single 1×8 ch, ABB S800 I/O
AI835A 3BSE051306R1 ABB Analog input 8 ch Thermocouple/mV, ABB S800 I/O
AI825 3BSE036456R1 ABB Analog Input Module
AI815 3BSE052604R1 ABB Analog Input
DI802 3BSE022360R1 ABB 8 channel 120 V a.c./d.c. digital input module
AI801 3BSE020512R1 ABB Analog Input Module
BC810K02 3BSE031155R1 ABB CEX-Bus interconnection
CI868K01 3BSE048845R1 ABB IEC 61850 Interface
CI862K01 ABB Communication equipment module
CI865K01 3BSE040795R1 ABB SATT I/O Interface
EI812F 3BDH000021R1 ABB Ethernet Communication Module
EI810F 3BDH000020R1 ABB Ethernet Communication Module
EI803F 3BDH000017R1 ABB Ethernet Communication Module
SD812F 3BDH000014R1 ABB Freelance Power Supply
SD802F 3BDH000012R1 ABB Freelance Power Supply
SA801F 3BDH000011R1 ABB Freelance Power Supply
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