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公司：漳州风云电气设备有限公司

VFP1-4550UP-B1变频器（Variable-frequency Drive，VFD）是应用变频技术与微电子技术，通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。 [1] 变频器主要由整流（交流变直流）、滤波、逆变（直流变交流）、制动单元、驱动单元、检测单元微处理单元等组成。变频器靠内部IGBT的开断来调整输出电源的电压和频率，根据电机的实际需要来提供其所需要的电源电压，进而达到节能、调速的目的，另外，变频器还有很多的保护功能，如过流、过压、过载保护等等。随着工业自动化程度的不断提高，变频器也得到了非常广泛的应用

VFP1-4550UP-B1主电路是给异步电动机提供调压调频电源的电力变换部分，变频器的主电路大体上可分为两类：电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容。电流型是将电流源的直流变换为交流的变频器，其直流回路滤波是电感。它由三部分构成，将工频电源变换为直流功率的“整流器”，吸收在变流器和逆变器产生的电压脉动的“平波回路”，以及将直流功率变换为交流功率的“逆变器“。

变频节能
VFP1-4550UP-B1变频器节能主要表现在风机、水泵的应用上。风机、泵类负载采用变频调速后，节电率为20%～60%，这是因为风机、泵类负载的实际消耗功率基本与转速的三次方成比例。当用户需要的平均流量较小时，风机、泵类采用变频调速使其转速降低，节能效果非常明显。而传统的风机、泵类采用挡板和阀门进行流量调节，电动机转速基本不变，耗电功率变化不大。据统计，风机、泵类电动机用电量占全国用电量的31%，占工业用电量的50%。在此类负载上使用变频调速装置具有非常重要的意义。目前，应用较成功的有恒压供水、各类风机、中央空调和液压泵的变频调速。 [5]
在自动化系统中应用
VFP1-4550UP-B1由于变频器内置有32位或16位的微处理器，具有多种算术逻辑运算和智能控制功能，输出频率精度为0.1%~0.01%，且设置有完善的检测、保护环节，因此，在自动化系统中获得广泛应用。例如：化纤工业中的卷绕、拉伸、计量、导丝；玻璃工业中的平板玻璃退火炉、玻璃窑搅拌、拉边机、制瓶机；电弧炉自动加料、配料系统以及电梯的智能控制等。变提高工艺水平和产品质量方面的应用频器在数控机床控制、汽车生产线、造纸和电梯上的应用。

VFP1-4550UP-B1 frequency converter (VFD) is an electric power control device that applies frequency conversion technology and microelectronic technology to control AC motor by changing the working power frequency of the motor. [1] Inverter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit and microprocessor unit. The voltage and frequency of the output power supply are adjusted by the opening and closing of the internal IGBT of the frequency converter, and the required power supply voltage is provided according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions, such as overcurrent, overvoltage and overload protection. With the continuous improvement of industrial automation, frequency converters have been widely used.

The main circuit of VFP1-4550UP-B1 is the power conversion part that provides voltage and frequency modulation power for asynchronous motors. The main circuits of frequency converters can be roughly divided into two categories: voltage type is a frequency converter that converts DC from voltage source to AC, and the filter of DC circuit is a capacitor. Current-type is a frequency converter that converts DC of current source into AC, and its DC loop filter is inductance. It consists of three parts: a rectifier that converts power frequency power into DC power, a smoothing circuit that absorbs voltage pulsation generated by current transformer and inverter, and an inverter that converts DC power into AC power.

Frequency conversion energy saving
The energy saving of VFP1-4550UP-B1 frequency converter is mainly manifested in the application of fans and pumps. After variable frequency speed regulation is adopted for fan and pump loads, the power saving rate is 20% ~ 60%, because the actual power consumption of fan and pump loads is basically proportional to the third power of rotating speed. When the average flow required by users is small, the speed of fans and pumps is reduced by frequency conversion, and the energy-saving effect is very obvious. However, the traditional fans and pumps use baffles and valves to regulate the flow rate, so the motor speed is basically unchanged and the power consumption changes little. According to statistics, the electricity consumption of fans and pump motors accounts for 31% of the national electricity consumption and 50% of the industrial electricity consumption. It is of great significance to use variable frequency speed regulating device on this kind of load. At present, the successful applications include constant pressure water supply, various fans, central air conditioning and variable frequency speed regulation of hydraulic pump. [5]
Application in automation system
VFP1-4550UP-B1 is widely used in automation systems because of its built-in 32-bit or 16-bit microprocessor, various arithmetic logic operations and intelligent control functions, and its output frequency accuracy of 0.1%~0.01%, and its perfect detection and protection links. For example: winding, stretching, metering and thread guiding in chemical fiber industry; Flat glass annealing furnace, glass furnace stirring, edge drawing machine and bottle making machine in glass industry; Automatic charging and batching system of electric arc furnace and intelligent control of elevator, etc. Application of frequency converter in improving process level and product quality in CNC machine control, automobile production line, paper making and elevator.

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