The model of the motor is composed of two parts, namely the product code and the specification code, arranged in sequence as stipulated in GB/T4831. The product code is represented by the motor series code and has the following meanings: Y series squirrel-cage rotor three-phase asynchronous motor YR series wound rotor three-phase asynchronous motors YKS series closed squirrel-cage rotor three-phase asynchronous motor with air-water cooler YKK series closed squirrel-cage rotor three-phase asynchronous motor with air-air cooler YRKS series closed wound rotor three-phase asynchronous motor with air-water cooler YRKK closed-type wound rotor three-phase asynchronous motor with air-air cooler