The type, basic parameters, technical requirements, test methods and inspection rules, as well as the requirements for marking, packaging, transportation and storage of conical rotor motor, Disc brake motor and three-phase asynchronous motor used in the chain electric hoist.

　　This standard is mainly applicable to motors for general purpose chain electric hoists. It is also suitable for electric motors for special purpose chain electric hoists and light and small lifting equipment, such as electric motors for wire rope electric hoists and operating mechanisms of electric single beam and electric single beam suspension cranes.

　　ZD and ZDY represent conical rotor braking three-phase asynchronous motors; The first digit machine seat number; The second digit is the length of the iron core; The third digit number of motor poles; LD type: the electric hoist trolley runs on the lower flange of the main beam, and the electric hoist is arranged on the Overhead crane below the main beam; LDP: The LDT electric single beam crane was developed in the late 1980s, equipped with imported German gourds and angle shaped trolleys. It adopts a welded box shaped main beam, and the trolley tracks are arranged on the web and side of the main beam. The LDPLDC electric single beam crane named in JB/T1306-1994 standard also uses a welded box girder, but the lower flange plate is wider and thicker, and the chain electric hoist runs directly on the lower flange plate. The CXT electric single beam crane belongs to this type. LDA: LDA is an improved type of LD (JB/T1306), MH is an electric hoist Gantry crane (JB/T56632), and LH is an electric hoist Overhead crane (JB/T3695).