Electric hydraulic pumps are an important power source for modern industrial equipment, automated production lines, and various engineering machinery. This article will explain how electric hydraulic pumps work, what they are made of, and how well they work. I will also give you a full guide to help you choose the right electric hydraulic pump. If you’re a purchasing manager or a manufacturer of equipment or machinery, this article will help you choose a high-performance electric hydraulic pump that suits your needs.
What are Electric Hydraulic Pumps?
In a hydraulic system, the electric hydraulic pump is more than just a pump that moves hydraulic fluid around. It is the most important part of the system for changing power into motion and creating pressure.
The Working Principle of an Electric Hydraulic Pump
It is very important to understand how electric hydraulic pumps work if you want to choose the right one. This section will introduce the basic working principles of electric hydraulic pumps and explain the differences in principles among common pump types. This will help you understand the significance of these differences in the actual operation of the equipment.
Electric Motor Drive and Hydraulic Energy Conversion Principle
In an electro-hydraulic pump, the energy conversion process happens in three stages. First, the electric motor drives the hydraulic pump via a coupling. The hydraulic pump creates a pressure difference between where the fluid comes in and where it goes out. This makes the pump work.
It is important to understand that the pressure in a hydraulic system is not created by the pump. The hydraulic pump makes sure there is a steady flow of fluid, and the pressure comes from the resistance it faces as it moves through the system and deals with a load. When the actuator is restricted by an external load, and the pump continues to supply fluid to the system, the fluid cannot flow freely, and the pressure rises until it balances the load.
Different Types of Electric Hydraulic Pump
Gear Pump
A gear pump works by using the rotation of a pair of gears that fit together. This creates sealed spaces between the teeth on the gears. The spaces move fluid from one side to another. It has a simple structure, is cheap, and doesn’t have strict rules about how clean the fluid should be. This makes it very popular in situations where the pressure is low to medium, and the equipment is used on and off. However, because of major internal leakage, gear pumps are usually not very efficient or stable when used at high pressure for a long time.
Vane Pumps
Vane pumps use sliding vanes within rotor slots to create different volumes in a special structure. This makes it possible to suck in and release fluid. Vane pumps are better than gear pumps because they are smoother and quieter. This makes them perfect for industrial equipment that needs to be stable and quiet. However, they need to be made more cleanly and precisely, and they are not suitable for use in dirty or very contaminated places.
Plunger Pumps
Piston pumps can change how much liquid there is in them very efficiently by moving pistons back and forth in the cylinder block. This makes them the type of pump with the highest pressure capability and efficiency out of the three types. Piston pumps are perfect for high-pressure, heavy-duty, and long-term use. But they are complicated and expensive, so they need to be matched to the system more strictly and maintained more carefully.
The Core Components of Electric Hydraulic Pumps
To choose the right electric hydraulic pump, you need to understand its main parts. This section will look at these main parts, explain what they do in the system, and point out important things to think about.
Electric Motor
The electric motor is the power source for the whole system. When it is switched on, it makes the hydraulic pump work. As well as how powerful it is, it’s important that the motor works well for a long time or is switched on and off a lot without overheating or becoming too heavy. If the motor is unstable, the hydraulic pump will also be affected.
Hydraulic Pump
The hydraulic pump is the most important part of an electric hydraulic pump system. It changes the rotational force of the electric motor into the pressure and flow of hydraulic oil. In practice, how well the hydraulic pump works under normal pressure and how much noise and vibration it makes directly affect how well the system performs overall.
Oil Tank
The oil tank is where hydraulic fluid is stored and circulated. In the tank, the hydraulic fluid can dissipate heat, release air bubbles and allow impurities to settle. If the oil tank is poorly designed, meaning there is not enough oil moving around, the system is more likely to have problems such as high oil temperature or unstable operation.
Valve Assembly
The valve assembly controls where the hydraulic fluid flows, the pressure level, and the order of operations. The system only works properly if the valve assembly is working well. If there is a problem with the valve assembly or the pressure control is unstable, the equipment may shake, respond slowly, or malfunction during use.
Filtration Device
The job of the filtration device is to stop impurities in the hydraulic oil from getting into the system. This protects the hydraulic pump and valve assembly. How well the filter works affects how quickly the inside parts wear out. If the oil is not clean enough, the system may still work, but it will malfunction more often later on.
Cooling Device
The cooling device is used to cool the hydraulic oil. If you keep the system on for a long time, the oil will get hot. If the heat is not released, it will affect how well the hydraulic oil works and how long the seals will last. The cooling device helps the system to stay in a steady state when it is on all the time.
Electrical Control System
The electrical control system is responsible for switching the motor on and off. Operators control the entire system through the electrical control system. The electrical control system also protects in case of equipment malfunction, preventing the problem from getting worse.
Comparison of Applications for Different Types of Electric Hydraulic Pumps
Even if the different types of electric hydraulic pumps look similar, there are big differences in how much weight they can carry and how they should be used. Knowing the differences will help you avoid any risks to your system.
Small Electric Hydraulic Pump
Small electric hydraulic pumps are used in lots of places. They are used in portable tools, equipment maintenance, emergency operations, and various mobile devices. These pumps are small, easy to install, and quick to start. They are also good for temporary or mobile operations. However, they can’t be used for long periods of time or when they’re under a lot of pressure because they get too hot.
Industrial-grade Electric Hydraulic Pump
Industrial-grade electric hydraulic pumps are used in many places, such as presses, automated equipment, assembly lines, and continuous production systems. The motors, pump bodies, and other parts of industrial-grade electric hydraulic pumps are usually designed to be used for a long time and to provide a steady output even when there is a lot of pressure. Bigger electric hydraulic pumps are more expensive than smaller ones, but they last longer and work better.
How to Choose The Right Electric Hydraulic Pump for Your Project？
Many people have problems choosing electric hydraulic pumps. This is not because they don’t know what to look for, but because the pumps seem to be right for the job, but then have problems when they are being used. To avoid this, the selection process should start with the operating conditions and system requirements, rather than beginning with the product catalogue. The following steps can help you make decisions about engineering and procurement.
Specify The Operating Conditions, not The Parameters
Before you can calculate the parameters, you need to know the current operating conditions of the equipment.
Intermittent Operation or Continuous Operation?
Intermittent duty cycles (such as in equipment maintenance and tool applications) allow for short periods of high-load operation, while continuous duty cycles (such as in production lines and presses) put more strain on the long-term stability of the motor, pump, and cooling system.
Single Action or a Cyclical System?
Single-action systems need to be used quickly, but only for a short time. Cyclic systems, on the other hand, focus on making sure that actions are consistent and reliable when they are done again. In high-frequency cyclic systems, even small differences are made bigger over time, which can lead to more heat being generated or parts wearing out.
Matching Pressure and Flow Rate Requirements
Once you know the operating conditions, you can work out the pressure and flow rate needed.
Pressure Matching
The right working pressure should be calculated based on the load, and not taken directly from the hydraulic pump’s rated pressure parameters. If you keep operating the system at the same pressure as the rating, it can easily fail.
Flow Rate Matching
The flow rate should be the same as the operating speed and frequency of the actuator. If there is not enough fluid flowing through the system, it will respond slowly. If there is too much fluid flowing through the system, it will use more energy and generate more heat.
So, you should look at the specifications, but also check that the pressure and flow rate can be output stably and continuously in real situations.
Consider System Compatibility
An electric hydraulic pump is not an isolated component; its performance depends on how well it is matched with the other components in the system.
Matching with Hydraulic Cylinders or Hydraulic Motors
It’s important to make sure the pump’s flow rate and pressure levels match the actuator’s specifications and load requirements. This helps to prevent unstable operation and energy wastage.
Matching with Valve Blocks
The size of the valve, how quickly it responds, and how it is controlled all directly affect how the pump works and how efficiently the system operates.
Matching with Electronic Control Systems
The way the system starts and stops, and how it is controlled, can affect how long the motor and pump last. If there are multiple control loops in the system, it is more important to make sure they all work well together than to improve how they all perform individually.
Reliability and Maintenance Cost Assessment
When we evaluate a project, it’s important to consider both the initial costs and the long-term operating costs. A cheap solution that uses a lot of energy, is often not available, and is hard to maintain, will often cost more over the life of the hydraulic pump. So, when choosing a solution, it’s better to go for one that’s reliable and easy to maintain, rather than just going for the cheapest option.
Troubleshooting and Maintenance of Electric Hydraulic Pumps
In practice, most electric hydraulic pump failures and quality problems are not due to manufacturing defects, but rather to inadequate maintenance or improper use during long-term operation. It is very important to understand why equipment often breaks down and to learn how to look after it so that it will work well for a long time.
Analysis of Common Causes of Malfunctions
Pressure that is too Low or not Stable
The most common causes are: the overflow valve setting is not right, the pump body is worn out, and the oil suction is poor. It’s important to remember that pressure problems don’t always mean that the pump is damaged. They are often caused by incorrect valve settings or poor oil quality.
Abnormal Heating
There are three main reasons why oil temperature keeps going up. These are: more internal leakage, not enough cooling capacity, or too much flow rate, which causes throttling losses. Using it at high temperatures for a long time makes the oil worse and wears the seals, and this affects how long it will last.
More Noise and Vibration
If you hear strange noises, it is probably related to the oil suction. This can be caused by air mixed into the oil, a low oil level, or too much resistance in the oil suction line. Also, if something is not connected properly or the internal parts are worn, this can also lead to increased vibration.
Problems Starting or the Overload Protection Activating Too Often
These problems are usually caused by a lack of motor power, the wrong starting method or too much resistance in the system. If the overload protection often activates, it’s important to check that the motor and pump are compatible, not just increase the protection threshold.
How to Maintain an Electric Hydraulic Pump?
Check The Fluid Regularly
How clean the hydraulic fluid is and how thick it is affect how well the hydraulic pump lubricates and seals. You should replace the fluid regularly and check it for contamination, moisture, or noticeable colour change.
Check The Filtration System
If your filters are blocked or not working properly, dirt and other things can get into the system and wear it out faster. It’s a good idea to clean or replace filters on time, according to the maintenance schedule. Don’t leave it until the system stops working.
Check The Motor and The Parts that Connect It
The parts that connect include couplings, mounting bolts and electrical connections. These should be checked regularly. If something is loose or the electrical contact is poor, it can cause vibration when it has been used for a long time.
Avoid Prolonged Overloading
The electric hydraulic pump can handle high loads for short periods, but if it is used too much for a long time, it will not last as long. The equipment should always be used within its normal load range.
FAQ
Can Electric Hydraulic Pumps Run All the Time?
Whether they can operate continuously depends on whether the motor, hydraulic pump and cooling system are designed for continuous operation.
Is Higher Pressure Always Better for An Electric Hydraulic Pump?
No. Too much pressure puts a lot of strain on the system. This can cause it to overheat and make the internal parts and seals wear out more quickly. This can shorten the hydraulic pump’s lifespan. The best way to use the system is to let it run at a steady pressure that is just right for the job, instead of always trying to make it go higher.
Why does The Electric Hydraulic Pump Cause The Circuit Breaker to Trip When It Starts?
If there’s a problem when you first turn it on, it’s usually because the motor is using too much electricity. This can cause a sudden increase in current, which activates the protective device. This doesn’t necessarily mean the hydraulic pump is faulty. More often, it’s caused by a mismatch between the system load and the starting method.
Do You Need to Stop The Electric Hydraulic Pump Regularly to Do Maintenance on It?
Yes. You should regularly check the hydraulic oil, filters, motor connections and cooling system, even if the equipment is operating normally. If you do regular maintenance, you can stop small problems from getting worse and making your equipment suddenly stop working.
Can One Electric Hydraulic Pump Power Several Actuators at Once?
Yes, but only if the system is designed to work with multiple actuators at the same time. If you don’t plan how the flow will be distributed and controlled, using multiple actuators at the same time can easily lead to movements that are not in sync or unstable pressure.
Final Thoughts
Now you should understand electric hydraulic pumps better. If you need to set up an electric hydraulic pump for your system and have any questions about choosing the right pump or other parts, please contact us. Target Hydraulics has been making electric hydraulic pumps for more than 10 years. We are experts in this field and can provide you with the best solution to meet your needs.
