The inverter is an electric transmission element that is used in frequency conversion skills and microelectronics skills to control and communicate with the motor by changing the frequency and fluctuation of the power supply of the motor.
With the emergence of thyristors, electrostatic induction transistors, high-voltage insulated gate bipolar thyristors and other components, electrical skills have changed with each passing day, and the speed regulation skills of the inverter have also been carried out.
To reduce the power loss, the voltage of the frequency is also changed accordingly, and this current value will greatly increase the electrical stress of the click winding and generate heat.
The frequency and voltage of the power frequency power supply are stable and constant, and the demand is directly connected to the motor.
The power frequency power supply of the inverter is generally 50Hz or 60Hz, whether it is in the household field or the production field, the frequency and voltage of the power frequency power supply are stable. The motor operating with the power frequency power supply may constitute a decrease in power when regulating the speed, and after the adjustment of the inverter, the motor can reduce the power loss when the speed is regulated.
There are many types of frequency conversion cabinets, which can be divided into general frequency converters, high-performance special frequency conversion cabinets, high-frequency frequency conversion cabinets, single-phase frequency conversion cabinets and three-phase frequency conversion cabinets according to the different uses of frequency converters. According to the operating principle of the inverter cabinet, it can be divided into V/f control inverter, slip frequency control inverter and vector control inverter.
The inverter cabinet can control the starting current of the motor: when the motor is directly started through the power frequency, it will generate 7-8 times the rated current of the motor. This current value will greatly increase the electrical stress of the clicking winding and generate heat. So as to reduce the life of the motor, and the frequency conversion speed regulation can be started at zero speed and zero voltage. Once a single frequency and voltage connection is established, the inverter can drive the load operation according to the V/F or vector control mode. The use of frequency conversion speed regulation can abundantly reduce the starting current and improve the bearing capacity of the winding. The most direct advantage of users is that the maintenance cost of the motor and high-voltage inverter will be further reduced, and the life of the motor will be increased accordingly.
How to choose the right inverter for the motor, so what is its principle when it is operating, control voltage: 380V, generally Δ-Y engine and frequency conversion operation for mutual standby switching maintenance, control voltage: 380V.
The inverter cabinet used in industry is divided into two kinds: single-phase and three-phase, which is distinguished from the voltage supplied by the main circuit, and the three-phase is the main circuit to be connected to the RST three-phase 380 volt communication power, and the output is connected to the UVW three-phase line to the motor; The single-phase is the main return, the inverter, the road access to the single-phase 220 volt LN communication electricity, the output is the same as the UVW three-phase line to the motor, the inverter input between the main circuit and the power grid, the demand through the air switch to series power supply to constitute maintenance, do not use the leakage maintenance switch, otherwise it can not operate normally, due to the leakage of the inverter, the high-voltage soft engine cabinet repair, the flow is very large. The output end of the inverter needs to be directly connected to the motor, and do not use equipment such as contactors to use it in series, otherwise the motor operation may be unbalanced due to the voltage drop of the contact.
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