Continuous (continuous) actuators, also called hydraulic motors, with two-way rotational output capability, are similar in design to hydraulic pumps and are divided into two main groups.
1. Gear, blade and gear motors
2- Piston (radial-axial) motors
Hydraulic motor efficiency
Reduction in hydraulic motors depends on the sealing state between the inlet and outlet of the engine and the internal leakage between the inlet and outlet causes a reduction in efficiency. The efficiency of motors such as pumps is divided into volumetric, mechanical and general types.
1- Volume efficiency
2- Mechanical performance
3- Overall efficiency
– Overall efficiency is 70% to 75% in gear motors, 75% to 85% in blades and 85% to 95% in piston engines.