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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3511 Pulse Input Module| Triconex | 3515
3504E Digital input module | Triconex | 3503E
3009 Main processor | Triconex | 3009
3008 Main Processor | Triconex | 3008
VE4001S5T2B4 16 Channels Input Card | DeltaV
VE4001S3T2B2 8 Channels Input Card | DeltaV
VE4001S3T2B1 8 Channels Input Card | DeltaV
VE4001S3T1B2 8 Channels Input Card | DeltaV
VE4001S3T1B1 8 Channels Input Card | DeltaV
VE4001S2T2B5 32 Channels Input Card | DeltaV
VE4001S2T2B4 Discrete Input Card | DeltaV
VE4001S2T2B3 Discrete Input Card | DeltaV
VE4001S2T2B2 Fused I/O Termination Block | DeltaV
VE4001S2T2B1 Standard I/O Termination Block | DeltaV
VE4001S2T2 Discrete Input Card | DeltaV
VE4001S2T1B3 Discrete Input Card | DeltaV
VE4001S2T1B2 Discrete Input Card | DeltaV
VE4001S2T1B1 Discrete Input module | DeltaV
VE3051C0 Power controller carrier | DeltaV
VE3008 MQ Controller | DeltaV
VE3006 MD-PLUS controller | DeltaV
VE3007 MX Controller | DeltaV
VE3005 Controller MD | DeltaV
VE3004 MD Controller | DeltaV
VE3002 Controller Module | DeltaV
SE4005S2B2 8 channels AO Card | DeltaV
SE4005S2B1 8 channels AO Card | DeltaV
SE4003S2B1 8 channels AI Card | DeltaV
SE4002S1T2B1 8 channels DO Card | DeltaV
SE4002S1T1B2 8 channels Discrete Output Card | DeltaV
SE4002S1T1B1 8 channels DO Card | DeltaV
SE4001S2T2B1 Traditional I/O | DeltaV
SE3008 SQ controller | DeltaV
SE3007 SX controller || DeltaV
SE3006 controller | DeltaV
KJ3002X1-BB1 AO, 8-Channel, 4-20 mA Card | DeltaV
KJ3002X1-BA1 8-Channel HART Card || DeltaV
KJ3001X1-BK1 Input module | DeltaV
KJ3001X1-BH1 8 channel output module || DeltaV
KJ3001X1-BG1 DO, 8-Channel, 24 VDC, Isolated Card | DeltaV
KJ3001X1-BD1 Dry contact module || DeltaV
KJ3001X1-BB1 Input module | DeltaV
KJ3001X1-BA1 DI, 8-Channel, 24 VDC, Isolated Card | DeltaV
KJ2201X1-BA1 Logic Solver – SLS 1508 || DeltaV
KJ2101X1-BA1 I/O interface card | DeltaV
KJ2004X1-BA1 Remote interface unit || DeltaV
KJ2002X1-BA1 Controller M3 module | DeltaV
KJ2001X1-BA1 controller | DeltaV
KJ1501X1-BC1 SYSTEM POWER SUPPLY | DeltaV
KJ1502X1-BB2 System power supply || DeltaV
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