YBBP series flameproof freguency control of motor speed three phase asynchronous motor made in accordancewith the provisions of GB3836.2 flameproof, the explosion-proof marks for Exd I BT4Gb.t is suitable for use asgeneral power equipment on the equipment in the places where the inflammable gas or explosive mixture formed bysteam and air in class A and class B group T1 ~ T4.The system can run with constant torgue and constant power in awide range. It is an ac speed-regulating explosion-proof motor powered by inverter.