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
https://www.xmamazon.com
https://www.xmamazon.com
https://www.plcdcs.com/
www.module-plc.com/
https://www.ymgk.com
PM858K01 3BSE082895R1 AC800M PM858 controller unit
PM857K02 3BSE088386R1 AC800M PM857 controller
PM857K01 3BSE088385R1 AC800M PM857 controller
TU921N 3KDE175113L9210 S900 I/O system
TU921S 3KDE175111L9210 S900 I/O system
CI920AB 3BDH000691R1 S900 I/O system communication interface module
CI920AN 3BDH000692R1 S900 I/O system communication interface module
DO910B 3KDE175322L9100 S900 Digital output module of the I/O system
CI920AS 3BDH000690R1 S900 I/O system communication interface module
FOXBORO RH916YY FBM242 Comp Term Assy
1756-EN2T/B ALLEN BRADLEY Communication interface module
NI-9923 781503-01 NI Terminal Block
CDAQ-9185 785064-01 NI Ethernet CompactDAQ Chassis
MTL MTL831B serial-data outputs
330180-X1-CN Proximity Sensor Bently Nevada
330130-040-00-05 Standard Extension Cable
330103-00-03-10-02-00 Proximity Probes
330106-05-30-10-02-05 3300 XL 8mm Reverse Mount Probes
330103-00-03-10-02-CN Proximity Probes
330180-51-CN 3300 XL Proximitor Sensor
330130-040-01-CN Bently Nevada 3300 XL Extension Cable
MVI56E-MCMR PROSOFT Communication module
FPS400-24 P0922YU Foxboro Power Supply
FBM230 P0926GU I/A Series Channel Isolated 4 Communicatio
FCP280 RH924WA FOXBORO Fiber Optic Network Adapter
FCP280 RH924YF foxboro Rail Mounted Modular Baseplate
330103-00-05-10-02-00 3300 XL 8 mm Proximity Probes
330130-040-00-00 Bently Nevada 3300 XL Standard Extension Cable
330180-51-00 Bently Nevada 3300XL Proximitor Sensor
PHOENIX LR 1-SC-24DC/600AC-30 1032921 Single phase solid state contactor
ALE111-S50 Yokogawa Ethernet Communication Module
ABB DSMB-01C 64691929 Power supply board
GE H201Ti smart transmitter
GE H201Ci-1 Intelligent Transmitter
“PHOENIX ILB BT ADIO MUX-OMNI 2884208 Wireless set”
3500/05-01-03-00-00-00 BENTLY NEVADA System Rack
3500/20 125744-02 BENTLY NEVADA Rack Interface Module
125840-02 Low Voltage AC Power Input Module 3500/15
125760-01 Data Manager I/O Module 3500/20
126632-01 Bently Nevada 3500/42M Proximitor/Seismic Monitor
125704-01 Bently Nevada I/O Module 3500/34
DeltaV SLS1508 SIS Logic Solver VS3202 SLS 1508
Bently Nevada 133819-01 RTD/TC Non-Isolated I/O Module 3500/60
216DB61 ABB HESG324063R100 HESG216882/A
Bently Nevada125720-01Spare 4-Channel Relay Output Module
Bently Nevada 3500/34 125696-01 TMR Relay Module
RELIANCE ELECTRIC S-D4043C
S-D4041B RELIANCE ELECTRIC
216BM61b HESG448267R1021 Binary Output Unit Connector
Phoenix IBILPD GND-PAC 2862990 Inline terminal
Reviews
There are no reviews yet.