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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PR6424/003-030 EPRO DCS controller Brand new stock
PR9268/300-000 EPRO Current current probe Brand new original
PR9376/010-011 epro Current current probe Brand new with box
PR9376/20 EPRO ER bus cable
RSM020 EPRO External shaft main board
SDM010 EPRO Inventory module Brand new stock
MMS6823R EPRO DCS system module
MMS3120/022-000 EPRO Axial vibration displacement monitoring module
PR9268/300-000 EPRO Adapter terminal module
MMS3120/022-000 EPRO Backplane connector
MMS6312 EPRO TSI speed card
MVI56-MNET PROSOFT Programmable control system
MVI56-MNETC PROSOFT Servo control panel
MVI56-MNETR PROSOFT System module
MVI56E-MCM PROSOFT PLC control system
MVI69-PDPMV1 PROSOFT Digital input module
MVI69L-MBS PROSOFT I/O communication modules
PLX32-EIP-SIE PROSOFT DCS system
PTQ-PDPMV1 PROSOFT Analog output module
RLX2-IHNF-A PROSOFT Serial communication module
149986-01 Spare 16-Channel Relay Control Module
4118 TRICONEX 4118 Enhanced Intelligent Communication Module (EICM) Isolated
8311 TRICONEX 8311 control system power supply 24VDC
4108 TRICOENX 4108 Enhanced Intelligent Communication Module (EICM) Non-Isolated
8310 TRICONEX 8310 control system power supply 120VAC/VDC
7518-1 TRICOENX 7518-1 Communication Network Module / ISA Bus
4508 TRICOENX 4508 High Speed Channel Interface Module (HIM)
8301A TRICONEX 8301A main frame power supply, 24VDC
8300A TRICOENX 8300A main frame power supply, 115VAC/DC
3500/33 BENTLY Relay 16 channel module
4400 TRICONEX 4400 Safety Management Module (SMM)
8302A TRICOENX 8302A main frame power supply, 230VAC
8106 TRICONEX 8106 Empty Terminal Slot
3500/50 BENTLY Rotating speed module
8306A TRICOENX 8306A Expansion / RXM Rack Power Supply, 24VDC
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