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
DS200SLCCG1ACC LAN communication card
DS200UDSAG1ADE exciter board
330180-51-CN 3300 XL preprocessor sensor
Approach probe on 330103-00-03-10-02-CN
330130-040-00-05 3300 XL Extension cable
330103-00-03-10-02-CN Approach probe
330103-00-03-10-02-00 short range detector
330104-06-13-10-01-CN 3300 XL 8mm short-range probe
CDAQ-9185 785064-01 NI CompactDAQ chassis
NI-9205 779357-01 C Series voltage input module
NI-9361 783407-01 C Series counter input module
CM597-ETH 1SAP173700R0001 Communication module
330104-11-22-10-01-CN 3300 XL 8mm short-range probe
FBM218 RH922VW HART Redundant communication output interface module
PXI-6602 counter/timer equipment
330703-00-060-10-02-00 3300 XL 11mm short range probe
330703-000-070-10-01-EN 3300 XL 11mm short-range probe
PXIE-1065 PXI chassis NI
330130-080-01-00 3300 XL standard extension cable
330180-X1-00 3300 XL preprocessor sensor
330104-07-22-10-02-00 3300 XL 8mm short range probe
2711P-T9W21D8S PanelView Plus 7 Graphics terminal
MDD112C-N-030-N2L-130GA0 servo motor
C400/A8/1/1/1/00 ELAU controller
MDD112D-N-020-N2L-130GA0 servo motor
Vibro-meter VM600-ABE040 204-040-100-011 system racks
IS200EROCH1AED digital Signal processor control panel
IS200ERIOH1ACB excitation regulator I/O board
900CS10-00 Touch Screen
PLX31-EIP-MBS4 Ethernet /IP to Modbus Serial 4 ports
Honeywell 9211-ET-HN1 51154724-100 MODBUS/TCP firewall
VMIVME7750-734 VME printed circuit board
VME-7807RC-414001 single board computer
CC-TDOR01 digital output relay module
DC-TDOB01 51307186-275 Digital output module
S70602-NANANA digital servo driver
PDC235 3BHE032025R0101 Unitrol PC D235 exciter control module
3500/15-04-01 3500/15 AC power supply
3500/42-02-R0 Proximitor seismic monitor
3500/42-09-01 Proximitor earthquake monitor
3500/04-01 3500/04 Internal barrier grounding module
3500/42-09-00 Proximitor seismic monitor 3500/42M
KJ4001X1-BE1 Input/output carrier
VM600 IOCN 200-566-000-012 200-566-101-012 input/output card
3500/92-04-01-00 3500/92 Communication gateway
KJ3102X1-BA1 Security simulation input card
MVME177-003 single board computer
IC695PSA040F RX3i Power module
IS200TBCIH21CD Contact input terminal board
3500/53M-03-00 3500/53M Electronic Speed detection system
MVME162PA-252SE Embedded controller
8102-HO-IP GE 8-channel Analog Output
DEIF RMP-112D Power relay
DEIF GPU-3 generator protection unit
Reviews
There are no reviews yet.