The method of vector control frequency conversion speed regulation is to convert the stator current Ia, Ib, Ic of the asynchronous motor in the three-phase coordinate system through three-phase - two-phase change, which is equivalent to the communication current Ia1Ib1 under the two-phase static coordinate system, and then through the directional rotation and change according to the rotor magnetic field, it is equivalent to the direct current Im1 and It1 under the synchronous rotating coordinate system (Im1 is equivalent to the excitation current of the DC motor; IT1 is equivalent to the armature current proportional to the torque), and then imitate the control method of the DC motor, obtain the control quantity of the DC motor, and complete the control of the asynchronous motor after the corresponding coordinate reversal.
Its essence is to equivalence the communication motor to the DC motor, and the speed and magnetic field weight are controlled independently. After manipulating the rotor flux, and then decomposing the stator current to obtain the two weights of torque and magnetic field, the coordinates are changed to complete the orthogonal or decoupling control. The vector manipulation method is of epoch-making significance. However, in practical application, because the rotor flux is difficult to observe accurately, the system characteristics are greatly affected by the motor parameters, and the vector rotation change used in the control process of the equivalent DC motor is complex, which makes it difficult to achieve the ideal analysis results in the practical control effect.
|
More on that
|
LS has reached agreements with Doosan and Hanwha in Korea on a business model for vacuum power generation
LS Electric recently signed an MOU agreement with Doosan Fuel Cell, Hanwha Power Systems, and Hanwha Asset Management in Seoul, Korea, to establish a business partnership for city gas companies to develop a fuel cell-vacuum power generation business model. Through this agreement, the two sides will expand the scope of cooperation ...
|
|
Introduction to wiring problems - LS power generation
1. Wiring of fire emergency lighting
Generally, the flame retardant wire is used to wear the metal pipe and the thickness of the protective layer is ≥ 30mm.
|
|
LS power terminal is faulty
From the perspective of application, the function of the terminal block should be achieved: the contact part should be conducted, and the contact should be reliable. The insulating parts should not be conducted, and it is necessary to insulate them firmly. There are three common forms of fatal failure of terminal blocks:
...
|
|
Precautions for the coordination of inverter and PLC - LS produces electricity
As an alternative to traditional relays, PLC is widely used in various fields of industrial control. Because the PLC can be used to change the control process with software, and has the characteristics of small size, sensitive assembly, simple programming, strong anti-disturbance ability and high reliability, it is especially suitable for operation in harsh environments. ...
|
|
Inverter maintenance principle analysis and inspection method
Principle analysis is the most fundamental way to eliminate the problem, when other methods are difficult to see the effect, you can start from the basic principle of the circuit, step by step to view, and finally find out the cause of the problem. To use this method, it is necessary to have a clear understanding of the principle of the circuit, and to grasp the various ...
|
|
Inverter external potentiometer connection method - LS power generation
The two wires are connected to the resistor, and the other wire is connected to the adjustment terminal.
The red thread is attached to the blackhead and inserted in a small hole.
Connect both ends of the IR potentiometer to +10V and ACM, and slide the termination to the voltage input terminal AVI.
...
|
|
The wiring distance between the motor and the inverter
Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, and the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, the interval between the motor and the inverter is 120m, and the input and output terminals of the inverter are powered ...
|
|
The function and function of the inverter VFD - LS produces electricity
1. Energy saving
The energy-saving effect of VFD is mainly manifested in the application of fans and water pumps. After the fan and pump load is selected for frequency conversion speed regulation, the power saving rate is 20% - 60%, because the actual power consumption of the fan and pump load is basically proportional to the cubic speed. When users ask for an average ...
|
|
The difference between voltage inverter and current inverter - LS produces electricity
For example, the operating principle of voltage inverter is mainly to regulate the voltage source, and the voltage source regulates the current to achieve the role of conditioning, while the current inverter is to directly regulate the current to achieve the role of conditioning.
...
|
|
The basic principle of motor protector selection - LS power production
The fundamental method of motor protector selection
At present, there is no unified standard for motor protectors on the market, and almost every manufacturer has its own type standard. In order to meet the needs of different customers, manufacturers derive many products with different uses, and a wide range of products for the majority of users to choose ...
|
|
The difference between multi-function inverter and general-purpose inverter - LS produces electricity
With the deepening of factory automation, the high efficiency and low cost of active warehouses, elevators, transfer systems, etc., as well as the high speed, high efficiency and high precision of small CNC machine tools, kneading and forming machines, textile and film machinery, etc.
|
|
The difference between LS power inverter and servo
An important difference between servo and frequency conversion is that frequency conversion can be without encoder, while servo must have an encoder for electronic commutation.
1. What the two have in common:
The AC servo technology itself is to learn and apply the technology of frequency conversion, and the servo control of the DC motor is based on the ...
|
|
Selection principles and key points of AC contactors for power production
1. The coil voltage of the contactor should generally be lower, so that the insulation requirements of the contactor can be reduced, and it is safer to use. However, in order to facilitate and reduce the equipment, it is often selected according to the actual grid voltage.
2. The operating frequency of the motor is not high, such as compressor, water pump, air ...
|
|
LS power generation installs the switching power supply step
1. Confirm the location of the device
Before the equipment switches on and off the power supply, it is necessary to confirm the location of the equipment, and generally require the equipment to be in a ventilated, boring, non-corrosive gas and dust-free place.
2. Equipment holder
The fixed base of the switching power supply is fixed on the orientation of the equipment, and the general ...
|
|
LS power circuit breaker wiring method
The wiring method of the circuit breaker has the front of the board, the back of the board, the plug-in type, the drawer type, if the user has no special requirements, they are supplied according to the front of the board, and the wiring before the board is a common wiring method.
1. Wiring method behind the board: The wiring feature behind the board is that the circuit breaker can be replaced or repaired, without wiring from the beginning.
|
|
An internal component of LS's power circuit breaker
1. Auxiliary contact: the contact mechanically linked with the main circuit of the circuit breaker and the closing mechanism is mainly used for the display of the circuit breaker and the closing status, and is connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker to control or interlock its related electrical appliances. For example, output to signal lights, relays, etc.
|
|
LS GTH, GTK series thermal relay models
Thermal Overload Relay GTH-22
GTH series: GTH-22, GTH-40, GTH-85, GTH-100, GTH-150, GTH-220,
GTH-400、GTH-600、GTH-12M、GTH-12MH、GTH-12M、GTH-MH
GTH series: GTH-22, GTH-40, GTH-85 ...
|
|
The role of the inverter's braking resistor - LS generates electricity
1. Maintain the inverter from the damage of regenerative electricity
In the process of rapid shutdown of the motor, because of the inertia, a lot of regenerative electric energy will be generated, if this part of the regenerative electric energy is not consumed in time, it will directly act on the DC circuit part of the inverter.
|
|
The difference between overload and overcurrent of the inverter
(1) The maintenance objectives are different
Overcurrent is mainly used to maintain the inverter, whereas overload is mainly used to maintain the motor. Because the capacity of the inverter sometimes needs to be increased by one or even two gears than the capacity of the motor, in this case, the inverter is not necessarily overcurrent when the motor is overloaded.
...
|
|
The interference phenomenon of the inverter - LS power generation
1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. In the water supply controlled by the inverter, the pressure transformer is used as the signal to collect the pressure, and the pressure transformer is interfered by the inverter;
3. When the inverter starts the motor, the voltage transformer signal is unstable ...
|
|
Contact
working hours
