The core indicators determining the power output capability of a hydraulic motor are:
1. Rated working pressure: The maximum allowable inlet and outlet pressure difference during continuous and stable operation of the hydraulic motor, usually measured in MPa, though some industries use bar.
2. Peak working pressure: The allowable overpressure value for a short period (usually ≤1 min), generally 20%~30% higher than the rated pressure.
3. Rated displacement: The theoretical volume of hydraulic oil consumed per revolution, measured in mL/r. A larger displacement results in higher output torque at the same pressure difference.
4. Rated speed range: The speed range for continuous and stable operation, including the minimum stable speed and the maximum rated speed. Exceeding the upper limit will exacerbate component wear and cavitation.
5. Rated output torque: The actual output torque at rated pressure and rated speed. The conventional theoretical calculation formula is T=Δp×V/(2π), where Δp is the working pressure difference and V is the displacement.
6. Efficiency parameters include volumetric efficiency (reflecting the degree of hydraulic oil leakage, ≥90% for conventional models) and mechanical efficiency (reflecting friction loss, ≥85% for conventional models). The total efficiency is the product of the two and directly determines the energy utilization rate.
