Hydraulic Motor Sizing
Hydraulic Motor Sizing Parameters Explained
In order to properly figure out hydraulic motor sizing, you will need to know the torque and speed that you will need to get from the motor during typical operation. You can also use horsepower and speed to come to a final number instead of torque and speed. The requirements of any hydraulic motor are to put out enough torque and speed to move a load, so that is why we start with these numbers when doing hydraulic motor sizing.
When figuring out the power of a motor, you would take torque and multiply it by speed – thus, some people think that you can classify a motor only by the amount of power it has. But, as you might know, motors are always optimized to operate best within a specific range of the speed of a load. This means that this calculation must also be included in the calculations when doing hydraulic motor sizing.
There are also six additional things that should be taken into consideration when choosing a hydraulic motor and sizing it. These parameters should be based on estimates of the expected hydraulic motors output.
System Pressure at Nominal Levels
Normal Operating Motor Inlet Pressure
Motor Efficiency Estimates
Length of Time for Acceleration of Load
Once you know all of the parameters discussed earlier in this article, you will be able to plug them in to the hydraulic motor sizing equation. You will then be able to come up with the torque requirements that you need for your hydraulic motor to perform accurately in your individual work environment.
Free hydraulic motor sizing calculators are available on the Internet that you can use by inputting the numbers that we discussed above, instead of having to perform the complicated calculations yourself by hand. These online calculators will save you much time and frustration, so if you are not a math lover you might want to check them out first before digging in to figure out the hydraulic motor sizing on your own. A quick search on Google or your favorite search engine will turn up several options for you to choose from, this includes hydraulic pump motor sizing calculators as well.
Getting data that will help you learn about the performance of your hydraulic motor in operating conditions that are not considered optimal, those that are not nominal or maximum, is a good idea. These conditions may also impact performance and they should at least be considered before making your final choice in a hydraulic motor.
This type of data is not normally included in the information that you will get from the manufacturer. You will have to contact the individual manufacturers and request the data from them so that you can analyze it. This is especially true if you are figuring hydraulic motor sizing for the aerospace industry.
In other industries, failure conditions, as well as non-nominal conditions may not be as important, so you will have to decide if this is necessary on a case-by-case basis in addition to the hydraulic motor sizing data.