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
Display operation panel PFSK164
Display operation panel PFSK162 3BSE015088R1
Display operation panel PFSK162
Display operation panel PFSK160A 3BSE009514R1
Display operation panel PFSK160
Display operation panel PFSK152 3BSE018877R1
Display operation panel PFSK152 3BSE018877R1
Display operation panel PFSK152
Display operation panel PFSK151 3BSE018876R1
Display operation panel PFSK151 3BSE018876R1
Display operation panel PFSK151
Display operation panel PFSK142 3BSE006505R1
Display operation panel PFSK130 3BSE002616R1
Display operation panel PFSK102
Display operation panel PFSA146 3BSE008844R1
Display operation panel PFSA145 3BSE008843R1
Display operation panel PFSA140 3BSE006503R1
Display operation panel PFSA140 3BSE006503R1
Display operation panel PFSA140
Display operation panel PFSA103D
Display operation panel PFSA103C
Display operation panel PFRL101D-5KN
Display operation panel PFRL101D 5.0KN
Display operation panel PFRL101D
Display operation panel PFRL101C
Display operation panel PFRL101B-1.0KN
Display operation panel PFRL101B
Display operation panel PFRL101A-0.5KN 3BSE023314R0003
Display operation panel PFRL101A
Display operation panel PFRA101 3BSE003911R230
Display operation panel PFRA101
Display operation panel PFPA201 3BSE022827R1
Display operation panel PFPA201
Display operation panel PFEL113
Display operation panel PFEL112
Display operation panel PFEL111
Display operation panel PfeifferTPR280
Display operation panel PFEA113-65 3BSE050092R65
Display operation panel PFEA113-65 3BSE050092R65
Display operation panel PFEA113-65 3BSE028144R0065
Display operation panel PFEA113-65
Display operation panel PFEA113-65
Display operation panel PFEA113-20 3BSE050092R20
Display operation panel PFEA113-20 3BSE028144R0020
Display operation panel PFEA113-20
Display operation panel PFEA113
Display operation panel PFEA112-65 3BSE050091R65
Display operation panel PFEA112-65 3BSE030369R0065
Display operation panel PFEA112-65
Display operation panel PFEA112-20 3BSE050091R20
Display operation panel PFEA112-20
Display operation panel PFEA112-20
Display operation panel PFEA112
Display operation panel PFEA111-65 3BSE050091R65
Display operation panel PFEA111-65 3BSE050090R65
Display operation panel PFEA111-65 3BSE050090R65
Display operation panel PFEA111-65 3BSE028140R0065
Display operation panel PFEA111-65
Display operation panel PFEA111-65
Display operation panel PFEA111-65
Display operation panel PFEA111-20 3BSE050090R20
Display operation panel PFEA111-20 3BSE050090R20
Display operation panel PFEA111-20 3BSE028140R0020
Display operation panel PFEA111-20 3BSE028140R0020
Display operation panel PFEA111-20
Display operation panel PFEA111-20
Display operation panel PFEA111
Display operation panel PFEA101
Display operation panel PFCL301E
Display operation panel PFCL201CE-20KN
Display operation panel PFCL201CE
Display operation panel PFCL201C/CD
Display operation panel PFCL201C 10KN
Display operation panel PFCL201C 5KN 3BSE027070R5
Display operation panel PFCL201C 20KN
Display operation panel PFCL201C 10KN
Display operation panel PFCL201C
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