Comparison of the efficiency of the high speed low torque hydrostatic drives using bent axis motor: An experimental study

Abstract

This article is aimed at analysing the steady-state performance of four hydrostatic drives and compares their overall efficiency. The speed of the hydrostatic drives is controlled by speed controlled vane pump, variable displacement flow compensated pump, variable displacement pressure compensated pump and proportional direction controlled valve. Bondgraph simulation technique is used to model the hydrostatic drive. The relationships of the loss coefficients with the state variables obtained from the model are identified through experimental investigation. Using them, at different torque levels, the performances of the hydrostatic drives are studied on their slips, torque losses and the overall efficiencies and they are validated experimentally. It is found that hydrostatic drive using speed controlled vane pump exhibits the maximum efficiency, whereas the poorest efficiency is shown by the valve controlled system out of the four drives considered in the analysis. Keywords Hydrostatic transmission system, high speed low torque motor, efficiency, speed controlled vane pump, variable displacement pressure compensated pump, variable displacement flow compensated pump, fixed displacement axial piston pump Date

Fault diagnosis and prognosis of a hydro-motor drive system using priority valve

“…The close tracking of the simulation results with the measurements shown in Figs. 13,14,15,16,17,18,19 and 20 verifies the model. From the above example, it is concluded that the root cause of the decrease in the bypass speed of the hydro-motor HM 2 is the deterioration of the pump that translates into the reduced supply flow rate.…”

“…Bond graph methodology [11][12][13][14][15] is employed for the modeling of the dynamics of the physical system along with its components. In such technique, power flow forms the basis where the exchange, storage and dissipation of energy are The bond graph model of the system is shown in Fig.…”

“…The parametric values considered in the model simulation are given in "Appendix 2." The leakage resistances of the hydro-motors were obtained from the earlier study [15].…”

Dual Row Rotary Piston Hydraulic Machine with Two Pumping Units

“…Two or more piston sets with supporting thrust bearings or rollers sliding (rolling) along the surface of a common stator during operation can be located one after another in the same rotor in different sections. This kind of design is mainly used as high-torque hydraulic motors [26][27][28][29][30][31][32].…”

Determination of the optimum steady-state performance of an open-loop and a closed-loop valve-controlled hydro-motor drive: a design approach

“…Using non-dimensional approach and considering the fixed loss coefficients of the hydro-motor, the conditions for the maximum efficiency and the power transfer of the valve-controlled hydraulic drive is examined by Watton [6] and the conclusions drawn regarding the effects of various losses of the motor on the efficiency of the system are established. In recent years, the performance of the proportional valvecontrolled bent-axis hydro-motor drive has been investigated by Hasan et al [7], where the slip, torque loss and overall efficiency of the said drive have been compared with the pump-controlled drive system. The proportional valve-controlled HSLT and the LSHT hydro-motor drives are widely used in construction machineries, which are usually non-cyclic in operation and cater to variable load demand due to changes in the operating conditions.…”