Abstract：The internal leakage pathways in a doubleacting doublestator slider motor were analyzed according to its internal structure detailed in order to calculate its volumetric efficiency precisely and subsequently to determine reasonable clearances for the seals. It was identified that there are three kinds of internal leakages and ten leakage pathways in the motor. The total leakage model was obtained when the motor was in ordinary connection or in differential connection modes through the combination of leakage flow rate expression of every leakage pathway. The results show that the internal leakage flow rate in the motor is related not only to itself structure parameters, but also to the working pressure and the output speed; moreover, the flow rate is dependent of connection mode of ports. However, the total leakage flow rate follows a common rule. An analysis was applied into a particular motor to identify the main factor that restricts a doubleacting doublestator slider motor can be used in a high pressure situation. It was found that the axial leakage is the main factor because it is mostly substantial. Finally, effects of clearance on axial leakage flow rate were explored to tend to provide useful information for optimizing the structure of doubleacting doublestator slider motor.
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