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The working principle of the frequency converter 1. The direct function of the frequency converter: By changing the voltage and frequency of the motor, the speed of the motor can be adjusted infinitely. Soft start energy saving, power factor compensation energy saving inverter indirect role: 1. Energy saving (power saving). The traditional speed regulation method for fans, pumps and other equipment is to adjust the air supply and water supply by adjusting the baffle and valve opening of the inlet or outlet. The input power is large, and a large amount of energy is consumed in the interception process of the baffle and the valve. in. When using variable frequency speed regulation, if the flow demand is reduced, the speed can be met by reducing the speed of the pump or fan. Reduce power consumption. 2. Improve the automation of production equipment. There are many brands of inverters, such as: Hangzhou Aosheng Electric Co., Ltd., the agent of the Japanese industry inverter CM530 series in order to meet the general needs of customers, through the expansion of the design can flexibly meet customer personality The requirements of the industry and industry meet the requirements of various complex high-precision transmissions, and provide high-integration integrated solutions for equipment manufacturing customers. Second, the principle of the inverter The working principle of the inverter is to provide voltage regulation for the asynchronous motor. The power conversion part of the frequency modulation power supply, the main circuit of the frequency converter can be roughly divided into two types: the voltage type is a frequency converter that converts the direct current of the voltage source into an alternating current, and the filtering of the direct current circuit is a capacitor. The current type is a frequency converter that converts the direct current of the current source into an alternating current, and the direct current loop filtering is an inductance. It consists of three parts, which converts the power frequency power supply into a "rectifier" of DC power, absorbs the "flat wave loop" of the voltage ripple generated by the converter and the inverter, and converts the DC power into the "reverse" of the AC power. Transformer." Recently, a large number of rectifiers have been used in rectifiers, which convert a commercial power supply into a DC power supply. Two sets of transistor converters can also be used to form the inverter, and since the power direction is reversible, the regenerative operation can be performed. The smoothing circuit has a ripple voltage of 6 times the frequency of the power supply, and the ripple current generated by the inverter also causes the DC voltage to fluctuate. In order to suppress voltage fluctuations, the ripple voltage (current) is absorbed by the inductor and the capacitor. When the capacity of the device is small, if the power supply and the main circuit constitute a device with a margin, the inductor can be omitted and a simple smoothing circuit can be used. The inverter is opposite to the rectifier. The inverter converts the DC power to the AC power of the required frequency. The 6-switch output device can be turned on and off at the determined time to obtain the 3-phase AC output. The switching time and voltage waveforms are shown by taking a voltage type pwm inverter as an example. The control circuit is a circuit that provides a control signal to the main circuit of the asynchronous motor (voltage and frequency adjustable). It has an "arithmetic circuit" of frequency and voltage, a "voltage and current detecting circuit" of the main circuit, and a "speed detecting of the motor". The circuit" is composed of a "drive circuit" that amplifies a control signal of an arithmetic circuit, and a "protection circuit" of the inverter and the motor. (1) Operation circuit: The external speed, torque and other commands are compared with the current and voltage signals of the detection circuit to determine the output voltage and frequency of the inverter. (2) Voltage and current detection circuit: It is isolated from the main circuit potential to detect voltage and current. (3) Drive circuit: A circuit that drives a main circuit device. It is isolated from the control circuit to turn the main circuit device on and off. (4) Speed ​​detection circuit: The signal of the speed detector (tg, plg, etc.) mounted on the asynchronous motor shaft machine is sent to the calculation circuit as a speed signal, and the motor can be operated at the command speed according to the command and calculation. (5) Protection circuit: Detect the voltage, current, etc. of the main circuit. When an abnormality such as overload or overvoltage occurs, in order to prevent damage to the inverter and the asynchronous motor, the inverter is stopped or the voltage and current values ​​are suppressed. Http://
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