Torque Performance of Pressure Balanced Type Vane Motor at Start and in Low Speed Range

Abstract

In this paper, a starting torque of a pressure balanced type vane motor is analysed and the calculated results are compared with experimental results. Bottom sides of vanes of the motor used in this work are always pushed radially by inlet pressure. Therefore the mechanical efficiency of the motor is less than 60% at start. Next, whole torque performances from start to maximum speed are investigated experimentally. And it becomes clear that the frictional torque of the motor increases with a decrease of rotational speed and it takes maximum value at start. The change of the frictional torque form start to maximum speed is continuous and its value at 0.01 rpm is almost equal to that at start.