Often asked: How To Size Hydraulic Pumps And Motors?

How do I know what size hydraulic pump I need?

Use this equation to help figure out what electric motor horsepower (HP) is required to drive a hydraulic pump. SImply take the gallons per minute (GPM) multiplied by the pump pressure PSI then divide that number by the result of 1,714 times efficiency (we used 85% effiencey in this case).

How do you calculate hydraulic motor and pump?

Equations for hydraulic pumps:

  1. Flow rate. Q = D n / 1000 (1) where. Q = flow rate (l/min) D = displacement of piston (cm3/rev)
  2. Shaft Torque. T = D p / 20 π (2) where. T = torque (Nm)
  3. Shaft Power. Ps = T n / 9554 (3) where. Ps = shaft power (kW)
  4. Hydraulic Power. Ph = Q p / 600 (4) where. Ph = hydraulic power (kW)

How do I choose a hydraulic pump motor?

If you calculate 20 GPM @ 300 PSI with an assumed overall efficiency of 89%, you would probably select a 5 Hp electric motor. However, if you calculate the same 20 GPM @ 300 PSI with the actual overall efficiency of 50%, you would know that you should be using a 7.5 Hp motor.

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How are hydraulic motors sized?

RE: Sizing Hydraulic Motor Motors are sized according to their “displacement” which is typically expressed as cubic inches per revolution (in³/rev) or cubic centimeters per revolution (cc/rev or cm³/rev). A big motor will give you lots of torque for the available pressure but need lots of flow for the required speed.

How do you calculate the CC of a hydraulic pump?

Theoretical flow is calculated by multiplying the pump’s displacement per revolution by its driven speed. So if the pump has a displacement of 100 cc/rev and is being driven at 1000 RPM its theoretical flow is 100 liters/minute.

Can I use a hydraulic pump as a motor?

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.

What is pump efficiency formula?

Pump efficiency is the “water horsepower” divided by the “brake horsepower” and multiplied by 100 to present it as a percentage (see formulas in Image 1). Brake horsepower (BHP) is the shaft horsepower the pump requires to meet the load. Brake horsepower takes pump efficiency into account, but not the motor efficiency.

How do you calculate hydraulic flow?

Multiply the cross-sectional area by the flow velocity, provided in unit of length over unit time squared. If the cross-sectional area and flow are truly perpendicular, the flow rate angle is zero degrees. The value you just calculated is the hydraulic flow.

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.

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How do I choose a pump motor?

When choosing a motor for a centrifugal pump, you must consider the impeller size, maximum capacity, specific gravity of the fluid, and service application in case API requirements apply. If you take these things into account, you will select the right motor for your centrifugal pump application.

What is the most efficient hydraulic pump?

Piston pumps, such as this Hengli America, are some of the most efficient hydraulic pump designs available.

How do you control a hydraulic motor?

Either of two basic methods are used for controlling the speed of a hydraulic motor. First, a variable-displacement pump controls flow to the motor. This configuartion is commonly known as a hydrostatic transmission.

How do you size a pump motor?

The power required to drive the pump at the rated design condition should always be less than the nameplate horsepower rating of the motor. So if the pump will require 4.5 HP at the design condition, at a minimum, the motor should be sized for 5 HP – the next nominal size above 4.5 HP.

How can you tell if a hydraulic pump is efficient?

Volumetric efficiency is determined by dividing the actual flow delivered by a pump at a given pressure by its theoretical flow. Theoretical flow is calculated by multiplying the pump’s displacement per revolution by its driven speed.

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