YBK3 series flameproof three-phase asynchronous motor is a special motor designed for coal mine mining machinery. The base is welded and formed by steel plate. The air hood, junction box and insulation structure are strengthened. The electrical performance, installation size and rated power are the same as those of YB2 motor. The explosion-proof performance of this series of motors meets the requirements of the GB3836.1-2010 Explosive Environment Part 1: General Requirements and the GB3836.2-2010 Explosive Environment Part 2: Equipment Protected by Flameproof Enclosure D standards, and is made into a flameproof Exd Ⅰ Mb, which is suitable for underground mining faces in coal mines.