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When the variable frequency drive is working, the current flowing through the variable frequency drive is very large, and the heat generated by the variable frequency drive is also very large. Below, I will introduce to you the two main reasons and solutions for the heating of the variable frequency drive of the special machine: 1. The problem of the variable frequency drive and the motor itself; ...
Common inverter interference methods are: conduction interference, coupling interference, radiation interference. Anti-interference measures: For the interference signal transmitted by radiation, it is mainly weakened by wiring and shielding the radiation source and the line to be interfered. For the interference signal transmitted through the line, it is mainly dealt with by adding filters, react...
When we are using VFD, we must be familiar with the basic working principle and functional characteristics of VFD. Before the inspection and maintenance of the frequency inverter, the main power supply of the equipment must be cut off; and the Variable Frequency Drive indicator light must be completely extinguished. Daily inspection items: Before powering on the VFD, check the temperature and humi...
At present, the main purpose of using frequency converters is energy saving and speed regulation, so according to different requirements, there are frequency converters with different control functions: conventional V/F control frequency converter and vector control frequency converter. With conventional V/F control, the voltage drop of the motor will increase relatively with the decrease of the m...
The first stage of the variable frequency AC drive is the frequency converter. The converter consists of six diodes, similar to the check valves used in plumbing systems. They allow current to flow in only one direction: the direction indicated by the arrow in the diode symbol. For example, whenever phase A voltage (voltage similar to pressure in plumbing) is more positive than phase B or C voltag...
1. Brand selection At present, there are hundreds of Frequency converter brands on the market, and the brand and model should be considered comprehensively according to various factors such as project budget, project requirements, and personal familiarity. In terms of market share, Japanese companies such as Toshiba, Mitsubishi, Fuji, and Panasonic are important variable frequency drive manufactur...
VFD has the functions of voltage stabilization, speed regulation, voltage regulation, frequency regulation, etc. It applies modern science and technology. Although it is expensive and has a complicated internal structure, it has good performance and is easy to use. Therefore, variable frequency drive is not only used for motors, but also for different Power, shape, and volume are widely used in va...
VFD is a control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's operating power supply. Vfd inverter is mainly composed of rectification (AC to DC), filter, inverter (DC to AC), braking unit, drive unit, detection unit, micro-processing unit, etc. VFD provides the power supply voltage it needs by turnin...
Frequency conversion speed regulation is to change the synchronous speed of the rotating magnetic field by changing the power supply frequency of the motor stator. It is an efficient speed regulation method without additional slip loss. The outstanding advantages are high speed regulation efficiency, low start-up energy consumption, wide speed regulation range, stepless speed regulation, fast dyna...
During the operation of the vfd drive, due to different operating conditions, the voltage may fluctuate greatly. When the intermediate DC circuit overvoltage occurs, it will have a great impact on the normal operation of the vfd drive, and even damage the equipment. , Causing casualties, the overvoltage phenomenon generated by the vfd drive usually refers to this type of overvoltage. First, the ov...
It turns out that a 7.5KW frequency converter drives a 7.5KW belt motor. Due to technical reasons, the power of this 7.5KW motor needs to be increased to 15KW. The original frequency converter is no longer specified, and the power is too small! So, is there any good solution? Some people will think whether the variable frequency drive can run in parallel like a transformer? That is, two 7.5KW vari...
Variable Frequency Drives (VFDs), also known as frequency converters, are widely used in industry to control the speed and torque of electric motors. These devices can be used in a variety of applications, including pumps, fans, conveyors, and even machine tools. They are popular because they provide precise control over motor speed, which can lead to increased efficiency, reduced energy consumpti...
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