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Frequency converter overview
Inverter is a power 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.

What the frequency converter changes is the main frequency. Generally, the voltage also changes with the change of the frequency, and the current is determined by the load. Or control the frequency and current, the voltage is determined by the load. The most common is the so-called frequency conversion speed regulation, such as fans, water pumps, and frequency conversion air conditioners, which use frequency converters.

Converter overview

A converter is an electrical device that changes the voltage, frequency, phase number and other power or characteristics of the power system.
The converter changes the current and is generally used for grid connection. Such as grid-connected converters for wind turbines. Since it is connected to the grid, the output voltage and frequency must be the same as the grid, and only the current can be changed. Therefore, this type of device is called a converter.
The difference between converter and frequency converter
The purpose of the control of the converter and the frequency converter is different:
The main purpose of the converter is to adjust the current, and the main purpose of the frequency converter is to adjust the frequency. But both may change frequency.
The converter that drives the doubly-fed generator, in order to make the doubly-fed generator generate alternating current that is completely consistent with the frequency of the grid. The converter injects a frequency-variable alternating current into the rotor of the doubly-fed generator to generate a rotating electromagnetic field; and requires that the rotational speed of this electromagnetic field plus the mechanical rotational speed on the generator shaft be equal to the synchronous rotational speed (such as 4-pole double space The synchronous speed of the engine is 1500r/min), so that the electromagnetic field on the rotor cuts the stator coil to generate alternating current. The frequency, phase, and voltage of this alternating current are exactly the same as those of the grid, so that the engine can be connected to the grid to generate electricity. The frequency is actually adjusted here, but the purpose is to make the output frequency of the generator the same as that of the power grid. As far as the effect of power generation is concerned, the current is adjusted.

The frequency converter that drives the asynchronous motor changes the speed by adjusting the frequency. Its fundamental function is to provide alternating current with variable frequency to the asynchronous motor, control the starting current of the motor, reduce the voltage fluctuation of the power line, adjust the torque limit, etc.; or let the motor rotate according to a certain control mode and the speed can be adjusted smoothly, so as to achieve energy saving or Improve the process of the production process.
Broadly speaking, frequency converters, inverters, transformers, etc. can all be called converters.