The performance of a orbital motor is directly determined by the Orbital motor specifications, which are both the core basis for design selection and key indicators for troubleshooting.
1. Pressure parameters: the cornerstone of power output
Rated pressure: usually 12.5-20MPa, representing the safe pressure range for continuous operation of the motor. For example, the rated pressure of Ningbo Taylormade BYM series is 14-16MPa, while the intermittent pressure of Parker TB series can reach 190bar (about 19MPa)19.
Peak pressure: The maximum pressure value allowed for a short period of time, generally 1.2-1.5 times the rated pressure. Overpressure use can lead to seal failure or increased stator and rotor wear6.
2. Displacement and torque: quantitative indicators of power output
Displacement (ml/r): the key parameter that determines the torque generating capacity. The larger the displacement, the more volume of hydraulic fluid is output per revolution, and the higher the torque. For example, the Danfoss OMT-250 has a displacement of 251.8ml/r and an output torque of 730N-m7;
3. Speed and flow: the balance of dynamic performance.
Speed range: determined by both displacement and flow rate, typically 50-600 r/min. For example, the Taylors BYM-S160 model has a rated speed of 500 r/min at 160 ml/r displacement, which corresponds to a flow rate of 80 L/min.1 The flow rate (L/min) must be matched to the supply capacity of the system, which may lead to excessive wear and even cavitation.
Flow rate (L/min): need to match the supply capacity of the system pump, the use of excessive flow will lead to excessive speed, aggravate wear and tear or even cavitation.
4. Efficiency indicators: the yardstick of energy conversion
Volumetric efficiency (≥90%): reflecting the level of internal leakage control, end-face flow-matching structure (e.g. BM2 series) is 5%-8% higher than the efficiency of shaft flow-matching37;
Mechanical efficiency (≥85%): related to bearing friction, tooth contact accuracy, the use of double-row angular contact bearing design can be improved by 3%-5%.
5. Dynamic relationship between parameters
(1) Triangular balance of displacement - torque - speed
Although large-displacement motors (e.g., OMT-500 type displacement 523.6ml/r) can output high torque of 1220N-m, the rated rotational speed is only 240r/min, which is suitable for low-speed and heavy-duty scenarios; whereas, small-displacement motors (e.g., OML-8 type displacement 8ml/r) can reach a rotational speed of 2,000r/min, which is suitable for high-speed and light-duty requirements.
(2) Pressure-life trade-off logic
When the pressure is raised from 14MPa to 20MPa, the life of BYM series motors in Ningbo Taylormade decreases by about 40%, which needs to be compensated by material reinforcement and process optimization.
(3) Temperature-viscosity coupling influence
At -20℃ low temperature startup, the increase of hydraulic oil viscosity leads to a 15%-20% decrease in mechanical efficiency, need to choose low condensation point hydraulic oil (e.g. L-HV32) and optimize the runner design.
The Orbital motor specifications system is like a precision gear set, where the optimization of each parameter affects the overall performance. From the basic formulas of pressure and displacement to the in-depth synergy of materials and processes, parameter selection is not only the result of scientific calculations, but also the crystallization of engineering experience. With the penetration of intelligence and new material technology, the parameter boundaries are constantly being broken through, pushing this classic hydraulic component towards a new stage of higher efficiency and reliability.
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