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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ROCKSON AUTOMATION MO-8-P01MO-01033
ROCKSON AUTOMATION MI-8-PO1MI_030321
ROCKSON AUTOMATION MI-8-P01MI-02016
RITTAL SK-3110
RHEINTACHO MESSTECHNIK GMBH 5750
RHEINTACHO MESSTECHNIK GMBH 5740
REXROTH AVENTICS 3460565500
RS DCF-30
POUNDFUL PF-MF-3Q9
PHONTECH SPA-1500
PHONTECH MPA 1600
LAUER-PCS-200FZ
PAN DELTA CONTROLS NAVI1560-AC
PAN ASIA TOTAL INSTRUMENT & CONTROL MODEL-P940-P-I
OMICRON OGS 3.1 REV1.01
NUNOTANI KEIKI SEISAKUSHO TYPE-PA-SPA-K118
NORIS RP51
NORIS VF500-G1
NORIS SA502-3G
NORIS MARINE SYSTEMS N3000-IMC-F
NORIS SG-2000
NORIS NORISPEED-9702028 FMM6-1-11-K
NORIS AUTOMATION GMBH-SG-2000
NORCONTROL NN806.3-HE220292C
NORCONTROL NA1116.1-HA220862B-B AC4-AC7
NORCONTROL AUTOMATION NA1115-HA220842-BB
NORCONTROL NA1114-HA331256-BB
NABCO RC1A
MUSASINO LWIII-H4-LEVEL-WATCH-III
MRC MT-400
MOLYNX VIDEMECH 6000 TX6416
MIURA CB1-100
MAN DIESEL Turbo DAU-11
KYMA CPU-100-P-KDU-102
KONGSBURG NORCONTROL DSU-001
KYMA KDADL1-M-Port P.KDA-100
KYMA KDADL-1-P.KDA-100
KT-ELECTRIC KT-ASD
KRAL EEG44-2416
KONGSBERG WEEK-35-97-SSV-7212-242.0000
KONGSBERG SEATEX DPS 100
KONGSBERG NORCONTROL ETU003
KONGSBERG NORCONTROL OPU 8810
KONGSBERG MRU-H-PN-MRUMMB1 SEATEX MRU
KONGSBERG GLB-91-7212-242.0000
KONGSBERG AL-100B-RPEX
KOMECO STX-SM-01
KOMECO ESP-2000-BS
KOMECO CS-08T
GE VMIACC-0584
GE VMIACC-5595-208
GE VMIACC-5595-208 350-805595-208J
GE R2E0N1A0A1T0A
GE RXE2N0Q0J132A
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