There are two series of three-phase asynchronous motors for high-voltage dust explosion-proof motors for coal mill, namely YFBKK series three-phase asynchronous motors for high-voltage box-type dust explosion-proof coal mill, and YFB series three-phase asynchronous motors for high-voltage cylindrical dust-explosion-proof coal mill. The above two series of motors are developed by combining the company's long-term production of high-volatge asynchronous dust explosion-proof motors and high-volatge asynchronous coal mill motor design concepts and many years of experience in the operation of the plant, and using new technology, new materials, new technology and have been verified reliable development. It has the features of novel design, compact structure, beautiful modelling, high starting performance, low noise, low vibration, high protection level, safe and reliable operation.