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Doublestator multispeed hydraulic motor is a novel hydraulic component based on international patent technology. There are four motors in one shell for a doubleacting doublestator multimotor, each of these submotors can work alone or be combined depending on the actual requirement. The structure of socalled multimotor is different from the common ones, there is one rotor corresponding to two stators in a shell, which can achieve the constant displacement motor output with multi torques. It has the advantages of small size, light weight, simple structure, and high efficiency in specific power and can output several different flow rates. The doublestator hydraulic motor can work in differential connections, which expand the range of applications and improve the adaptability for the multimotors. As the distance between the inner and outer stator is equal, no returning springs or such mechanisms are required. In order to eliminate the adverse effects caused by the impact of flow distribution of doublestator vane motor, the valve structure of doublestator motor was improved, that was to open closed die compression angle and closed die expansion angle, which effectively achieved pre boost and pre pressure relief. The mathematical model of the closed dead angle of the doublestator motor was derived, and the characteristics of pressure change in the closed die cavity were analyzed. Based on dynamic mesh and its userdefined function (UDF) programming technology, the threedimensional numerical simulation of the twostator motor was performed. The results showed that compared with the existing doublestator motor, open closed angle can effectively reduce the phenomenon of high pressure backflow and abrupt pressure change, and made the change of oil pressure in transition zone tended to be more gentle, which laid the theoretical foundation for the reasonable design of doublestator components in the future.