In this paper the authors have presented an integrated study of an orbital rotor Low Speed High Torque (LSHT) hydrostatic unit in a Hydrostatic Transmission (HST) System and an attempt has been made to estimate some critical parameters of such class of geometrically complex machine. Owing to the close tolerance in between the rotor-stator interface of the motor leakage takes place from the high pressure to the low pressure chamber and is difficult to estimate during operation. Based on the simulation and experimental investigations, a semi-empirical approach is proposed here to estimate its interchamber leakage resistance and for that the machine need not be disassembled. Using the actual parametric values, the overall dynamic model of the plant has been validated experimentally.

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