Now the elevators are controlled by inverters. When the inverter fails, it will cause inconvenience to many people. If the maintenance personnel can correctly understand the principle of the elevator inverter, the maintenance will be easy. Let's take a look at the working principle of the elevator inverter with the fuji Elevator Manufacturers .

VVVF is the abbreviation of Variable Voltage and Variable Frequency, which means changing the voltage and changing the frequency, which is what people call variable voltage conversion.

CVCF is an abbreviation of Constant Voltage and Constant Frequency, which means constant voltage, constant frequency, which is what people call constant voltage constant frequency. The power supply we use is divided into AC power supply and DC power supply. Generally, the DC power supply is mostly obtained by AC power supply transformer transformation and rectification and filtering. AC power accounts for about 95% of the total power used by people. Whether it is used in the home or in the factory, single-phase AC power supply and three-phase AC power supply, the voltage and frequency have certain standards according to the regulations of each country. For example, the direct-user single-phase AC power is 220V, three-phase AC. The voltage of the wire is 380V and the frequency is 50Hz. The voltage and frequency of the power supply in other countries may be different in China's voltage and frequency. For example, single-phase 100V/60Hz, three-phase 200V/60Hz, etc., standard voltage and frequency AC power supply. Called power frequency AC.

Generally, a device that converts a power frequency alternating current having a constant voltage and frequency into a voltage or a variable frequency alternating current is called a "frequency converter". In order to generate a variable voltage and frequency, the device first converts the alternating current of the power source to direct current (DC), a process called rectification. A device that converts direct current (DC) to alternating current (AC) is scientifically termed "inverter". The general inverter is an inverter power source that inverts the DC power supply to a certain fixed frequency and a certain voltage. For the inverter whose inverter is frequency adjustable and voltage adjustable, we call it the inverter. The waveform outputted by the inverter is an analog sine wave, which is mainly used for speed regulation of three-phase asynchronous motor, also called frequency converter. For variable frequency inverters with high waveform requirements mainly used in instrumentation testing equipment, the waveform should be sorted to output a standard sine wave, called a variable frequency power supply. The general variable frequency power supply is 15-20 times the price of the inverter. Since the main device that generates a varying voltage or frequency in the inverter device is called "inverter", the product itself is named "inverter", ie: the inverter. The frequency converter can also be used in home appliances. Among the home appliances that use inverters, there are not only motors (such as air conditioners) but also fluorescent lamps. A frequency converter for motor control that changes both voltage and frequency. However, the inverter used for fluorescent lamps is mainly used to adjust the frequency of power supply. Equipment used to generate alternating current from batteries (direct current) used in automobiles is also sold under the name "inverter". The working principle of the frequency converter is widely used in various fields. For example, the power supply of a computer power supply, in this application, the frequency converter is used to suppress reverse voltage, frequency fluctuations and instantaneous power failure of the power supply.