In this paper the steady state performance of epitrochoid generated orbital 'rotary piston machine' (ROPIMA) type 'low-speed high-torque' (LSHT) hydrostatic unit has been studied. The complex variation of the volume of a chamber of such a machinewith shaft rotation, along with the various flow and torque losses, demand a structured approach to arrive at its mathematical model. In conventional approaches the system morphology becomes obscured as the mathematical model is approached. Bondgraphprovides a structured approach to model engineering systems in a simplified manner. A reduced Bondgraph model of the LSHT Orbital motor is made where the various losses are lumped in suitable resistive elements. The variations of the loss coefficients are identified. The predicted performance of the motor has been experimentally verified.
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