Emerging Inverter's various functions
Emerson's various functions and applications, I believe we don't know much about it. Next, Shanghai Kuanying Automation Equipment Co., Ltd. will take us to understand the relevant content, I hope we can Helpful.
Single-phase communication power supply and three-phase communication power supply and frequency, whether for household use or factory use, must be standardized according to national rules. For example, according to the rules of mainland China, the DC user's single-phase communication voltage is 220V, the three-phase communication voltage is 380V, and the frequency is 50Hz. The power supply voltage and frequency in other regions are different from those in China, such as single-phase 100V/60Hz and three-phase 200V/60Hz. The standard voltage and frequency communication power supply is called power frequency communication.
The main circuit is the power conversion section that provides voltage and frequency modulation power for the asynchronous motor. The voltage type is a converter that converts a DC voltage source into a communication inverter. The current mode is to convert the DC current of the current source into a communication inverter, and the DC loop filter is an inductor. It consists of three parts, which converts the power supply into a DC power "rectifier" that absorbs the voltage ripple generated by the converter and the inverter "flat-wave loop".
In general, a device that converts an AC with a constant voltage and frequency into an AC with a variable voltage or frequency is called a frequency converter. In order to generate a variable voltage and frequency, the device first converts the communication of the power supply to direct current (DC), a process called rectification.
A general inverter is an inverter that converts a DC power supply into a certain frequency and a certain voltage. Inverters with adjustable frequency and voltage are called inverters.
(1) Control stop mode.
Same as the controllable acceleration. In the variable frequency speed regulation, the parking method can be controlled, and different parking methods (deceleration parking, free parking, deceleration parking + DC braking) can be selected. Similarly, it can reduce the impact on mechanical components and motors, making the entire system more reliable and the life expectancy will improve accordingly.
(2) Energy saving
The use of frequency converters can greatly reduce the energy consumption of centrifugal fans and centrifugal pumps, which has been reflected in more than ten years of engineering experience. Since the final energy consumption is proportional to the motor speed, the return on capital conversion is faster.
(3) Cut mechanical transmission components.
At present, vector control inverters and synchronous motors can achieve high-efficiency torque output, and then save mechanical transmission components such as gearboxes, and finally form a direct conversion drive system. Then lower the cost and space, and improve stability.
(4) Reversible operation control
In the inverter control, in order to complete the reversible operation control, no additional reversible control equipment is required, and only the phase sequence of the output voltage is changed, that is, It can reduce the cost of protection and save installation space.
The core of the inverter is power electronics and control methods. Power electronics are devices that can turn on and off and complete various converters in a circuit. The frequency converter is such a converter. They are carried out with the development of inverter equipment. The quality of the inverter depends on its switching capabilities, current and extra voltage. The losses in the switching process determine the efficiency and volume of the inverter. The speed control characteristics and uses of the frequency converter are different from the different control methods. The control methods are divided into open loop control and closed loop control. Open loop control has U/F (voltage and frequency) share control, closed loop slip frequency control and various vector manipulations.
The application of the inverter is expanding and the technology selected is expanding. In the main circuit, a new gate-manipulation technique is selected, and the saturation voltage Uce(sat) between the collector and the emitter is greatly reduced. Therefore, the fourth generation of IGBTs has been developed, and even general-purpose inverters have entered a new era of vector manipulation. As long as the user selects the spare board, the general-purpose inverter can be converted into a vector-controlled inverter using the speed sensor PG (pulse generator). Most of the sensor devices use high-resolution 16-bit digital encoders, and the signal parallel transmission method is changed to serial transmission. In terms of intelligence, the newly developed inverter can pre-measure certain parts of the capacitor, such as capacitor capacity, total running time and ambient humidity, and comprehensively evaluate the life of the component. The general-purpose inverter is equipped with the RS-485 specification and operates via a special open bus method.
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