31C075-503-4-00 减速电机

变频器原理（英文Variable-frequency Drive，简称VFD）是应用变频技术与微电子技术的原理，通过改变电机工作电源频率的方式来控制交流电动机的电力控制设备。使用的电源分为交流电源和直流电源，一般的直流电源大多是由交流电源通过变压器变压，整流滤波后得到的。交流电源在人们使用电源中占总使用电源的95%左右。

无论是用于家庭还是用于工厂，单相交流电源和三相交流电源，其电压和频率均按各国的规定有一定的标准，如我国大陆规定，直接用户单相交流电压为220V，三相交流电线电压为380V，频率为50Hz，其它国家的电源电压和频率可能与我国的电压和频率不同，如有单相100V/60Hz，三相200V/60Hz等等，标准的电压和频率的交流供电电源叫工频交流电。

Variable frequency drive (VFD) is the principle of applying frequency conversion technology and microelectronics technology to control the power control equipment of AC motors by changing the frequency of the motor's working power supply. The power supply used is divided into AC power supply and DC power supply. Generally, DC power supply is mostly obtained by AC power supply through transformer transformation, rectification and filtering. AC power accounts for about 95% of the total power used by people.

Whether used in households or factories, the voltage and frequency of single-phase AC power supplies and three-phase AC power supplies are subject to certain standards according to the regulations of various countries. For example, according to the regulations in mainland China, the single-phase AC voltage for direct users is 220V, the three-phase AC wire voltage is 380V, and the frequency is 50Hz. The voltage and frequency of power supplies in other countries may be different from those in China, such as single-phase 100V/60Hz, three-phase 200V/60Hz, etc, The standard voltage and frequency of AC power supply is called power frequency AC power.