Voltage Space Vector (SVPWM) Manipulation Method:
It is based on the premise of the overall generation effect of the three-phase waveform, with the intention of approximating the ideal circular rotating magnetic field trajectory of the motor air gap, generating the three-phase modulation waveform at one time, and controlling it by approaching the circle with inscribed polygons. After practical application, it has been improved, that is, the introduction of frequency compensation, which can eliminate the error of speed control; By reacting the reaction to estimate the flux amplitude, the influence of stator resistance at low speed is eliminated. The output voltage and current are closed to improve the accuracy and stability of the dynamics. However, there are many links in the control circuit, and there is no torque adjustment, so the function of the system has not been fundamentally improved.
1U/f=C Sine Pulse Width Modulation (SPWM) Manipulation Method:
It is characterized by simple control circuit structure, low cost, good hardness of mechanical characteristics, and can meet the smooth speed regulation requirements of general transmission, and has been widely used in various fields of industry. However, in low frequency, because the output voltage is low, the torque is significantly affected by the voltage drop of the stator resistance, so that the output torque is reduced. In addition, its mechanical characteristics are not as hard as DC motors, dynamic torque capabilities and static speed regulation functions are not satisfactory, and the system function is not high, the control curve will change with the change of load, the torque response is slow, the motor torque utilization rate is not high, and the function decreases due to the existence of stator resistance and inverter dead zone effect at low speed, and the stability deteriorates. Therefore, people have studied vector control frequency conversion speed regulation.
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Excessive capacity of the inverter causes harm to electrical equipment - Senlan inverter
(1) The harmonic current generated will directly cause the additional heating of the motor, so that the stator of the motor surpasses the additional temperature rise of the motor itself, so that the additional output capacity of the motor will be greatly reduced.
(2) The current output of the inverter ...
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Inverter super password summary
1. Delta's super password-B series: 57522; - H-series: 33582; S1 series inverter universal password: 575222.
Second, Huifeng inverter (that is, now Ou Rui inverter), the general super password of its products is: 18881500-G 1500-P 1000- ...
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The reason why the inverter damaged the motor - Senlan
The presentation of inverters has brought a revolution to industrial automation control and motor energy saving. Industrial production is simply inseparable from the inverter, even in the daily livelihood, elevators, inverter air conditioning has become a part of the insistence, inverter from the beginning into all corners of production, subsistence. However...
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Get to know the capacitor of the inverter - Sunland inverter
1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is a component composed of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is first and foremost the communication through the DC block. The size of the capacitance is ...
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The selection of the speed control mode of the universal inverter - Senland
How to choose the speed control form of the general inverter: the general inverter is also known as the high-performance inverter, the PG-free vector inverter, and the torque control inverter, why? Originally, the main speed control form is different, so how to choose the speed control form of the inverter?
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Effect of inrush current on inverter - Senlan
In the process of repairing the inverter, we can find that because of the back electromotive force in the stator winding, the electromotive force in the synchronous generator state and the self-induced electromotive force in the self-loop rotor, the current impact will inevitably have a negative impact on the motor, the inverter (Variable-frequency ...
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Hope Sunland launched the new Hope800 series inverter
Hope Sunland Technology Co., Ltd. is a national key high-tech enterprise dedicated to the research and development of high, medium and low voltage frequency conversion technology and the design, development, production, sales and service of related products.
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Failure of robot contactor and inverter - Senland
Robot contactors are noisy?
Cause:
It is likely that the joint contact surface of the contactor is uneven, and the surface is sand or rust. The result will constitute a phase loss, which will lead to the burnout of contactors, switch frequency conversion and other components.
Solution:
will control the ...
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Sunland inverter control panel button function
1. The "FUNC/DATA" key is a programming key, press this button once to convert the operation mode, and press it again to read and write the function code;
2. The "SET/>>" button is the display switch and shift key, press this key to switch the display content, and press it again to ...
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The difference between strong and weak inverter - Sunland inverter
The inverter includes a rectifier circuit and an inverter circuit, and the input communication electricity is converted into DC voltage through the rectifier circuit and flat-wave circuit, and then through the difference between strong and weak current, it is mainly reflected in the different uses. Strong electricity is used as a kind of power power, and weak electricity is used for information transmission. In detail ...
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Introduction to the speed regulation mode of inverter motor - Senlan
1. Mechanical speed regulation form
There are three methods of mechanical speed regulation: electromagnetic clutch, hydraulic coupling, and viscous clutch. Among them, the hydraulic coupling device is widely used, that is, a hydraulic coupling device is connected in series between the motor and the load, and the concave and convex liquid level is used to adjust the hydraulic coupling between the motor and the load.
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Sunland inverter overcurrent fault maintenance method
When the inverter current is too large, exceeding the limit value of the inverter, the maintenance circuit will produce action, so that the inverter trips and stops, and the phenomenon of repairing such inverter can be divided into energized ...
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Inverter phenomenon detection method and judgment - Senlan
1. The power-on trip or the main power terminal part of the inverter shows sparks.
Disconnect the power cord, check whether the input terminal of the inverter is short-circuited, and check whether the DC side terminals P and N of the central circuit of the inverter are short-circuited. Perhaps the cause is a damaged rectifier or a short circuit in the central circuit.
2 ...
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At the physical level, the stable operation of the inverter is guaranteed-Senlan inverter
For the most popular electrical control equipment inverter (Variable-frequency Drive, VFD), as a precision electronic industrial control equipment, in order to run smoothly for a long time, we, as professional and technical personnel, need to be on the VFD device or before the operation.
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Attention to the shortcomings of the inverter - hope Senlan
The wiring interval between the motor and the inverter is too long, causing the new motor to catch fire
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, the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, ...
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The inverter is regularly replaced with the device - Sunland inverter
1. Cooling fan
As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
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Senlan inverter selection principle
1. Select the inverter according to the load characteristics, such as the load is constant torque load, you can choose Siemens MM440 inverter, ABB ACS800 series inverter, etc.; If the load is a fan or pump load, you can choose Siemens MM430 inverter, ABB ACS510 series inverter, etc.
2、 ...
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Sunland attended the 2015 Industrial Automation Exhibition in Nuremberg, Germany
November 24, 2015 - November 26, 2015, "Germany Nuremberg Industrial Automation Exhibition" was successfully carried out at the Nuremberg International Exhibition Center in Germany, and it is expected that Sunland as a domestic professional inverter manufacturer also participated in the exhibition, in this exhibition, in addition to the usual SB70, ...
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Control the hovering function operation and principle of the inverter - Sunland inverter
How does the hovering function of the inverter work?
When the speed of the asynchronous motor is 0, the encoder response is meaningless, and it needs to be converted to V/F control, and the frequency is set to 0; The voltage is set to 0 speed at which the motor promises to withstand the current at the moment ...
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Characteristics of two-phase electric fan inverter - Sunland inverter
The digital signal processor is selected, and the work efficiency is higher
A good quality two-phase electric fan inverter uses a digital signal processor, which can make the work efficiency higher, that is, it may take 3 hours to complete the work, but now it only takes 2 hours to be able to...
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