The flameproof three-phase asynchronous motor for YBF3 series fans is designed and manufactured for supporting flameproof fans, and can also be used as a special motor for supporting BT35-11 series explosion-proof axial fans. Its electrical performance and rated power are the same as YB2 motor. The explosion-proof performance of this series of motors complies with 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 Gb.