Proper hydraulic motor selection starts with the expected performance required by the application, then works back to the prime mover—the pump. Then it is necessary to evaluate the cost of your motor options along with the degree of complexity you want for the overall system.
How do you size a hydraulic motor and pump?
If system pressure and flow are constant, motor sizing simply involves the standard equation: hp = (Q ×P) ÷ (1,714×EM ), where: hp is horsepower, Q is flow in gpm, P is pressure in psi, and EM is the pump’s mechanical efficiency.
Can I use a hydraulic pump as a motor?
Can hydraulic pumps be used as motors? A hydraulic motor is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement (rotation). However, many hydraulic pumps cannot be used as hydraulic motors because they cannot be backdriven.
How much HP does a hydraulic pump need?
1 HP is required for each 1 GPM at 1500 PSI or any multiple of 1500 such as 3 GPM at 500 PSI, 2 GPM at 750 PSI, 1/2 GPM at 3000 PSI, etc. Another handy rule-of-thumb is that it takes about 5% of the pump maximum rated HP to drive the pump when unloaded and pressure is very low.
What type of hydraulic motor is generally most efficient 85 95 %)?
Friction between mating parts affects the mechanical efficiency of a hydraulic motor. Gear motors typically have an overall efficiency of 70–75% as compared to vane motors which have 75– 85% and piston motors having 85–95%.
Why are hydraulic cylinders cushioned?
Why Is Cushioning Necessary? Cushioning is needed to lower the speed of the cylinder before it reaches the end cap. Lowering the speed of the piston helps reduce stress on the components within the cylinder. It also lessens vibration conveyed to the other parts of the machine.
How efficient is a hydraulic motor?
A typical hydraulic pump is only 80-90% efficient. losses by utilizing a high viscosity index to maintain fluid viscosity in the optimum range across a wide operating temperature range. Increasing system pressure also reduces hydraulic pump efficiency.