Can I get a 40KN force from a hydraulic cylinder powered by an electric motor?

[SteveAlex]

Im thinking of designing a tipping trailer for a car. I need a force of 40KN exerted to tip but would this be too much for driving with an electric motor powered by the car battery. If not what size of motor and pump would I need? thanks

 

[K^2]

With hydraulics, you can get absolutely any force with absolutely any power input. You can hand-crank 40kN with hydraulics. In fact, I'm pretty sure you could find a hydraulic car lift that does just that.

Now, if you have a force, say these 40kN, and the time in which you want to raise the load a certain distance, you can get power. Say you want to raise 40kN load 1 foot in 1 minute. That works out to roughly 200W. Factor in loses, both mechanical and electrical, and you are probably looking for a 300-400W motor. At 12V, that works out to something in the 25-35 amp range. You should be able to draw that from a car battery.

 

[SteveAlex]

Thank you for reply, very helpful

 

[CWatters]

Just for completeness the equation K^2 is using is ..

Power = Force * velocity = force * distance/time

Force in Newtons
Distance in Meters
time in seconds
Power in watts

If drawing 25A think about the wire gauge needed and use appropriatly rated switch and fuse. A standard 30A rated switch might not last very long as the startup current could be much higher than 25A.

Perhaps assume the motor is only 60-80% efficient? The pump?

 

[sardar]

I can say that it is possible to achieve a force of 40KN from a hydraulic cylinder powered by an electric motor. The force generated by a hydraulic cylinder is directly proportional to the pressure and area of the cylinder. Therefore, by increasing the pressure and/or the area of the cylinder, a force of 40KN can be achieved.

In terms of designing a tipping trailer for a car, it is important to consider the capabilities of the car's battery and the size of the motor and pump needed. Generally, electric motors are capable of generating high forces, but it is important to ensure that the motor and battery are able to sustain the load and provide enough power for the desired force. It would be beneficial to consult with a mechanical engineer or specialist in hydraulic systems to determine the appropriate size of motor and pump for your specific application.

Additionally, it is important to consider the safety and stability of the tipping trailer when designing it. The force of 40KN may be too much for the car to handle, so it is important to ensure that the trailer is properly balanced and the force is distributed evenly to prevent any accidents or damage to the car or trailer. Proper design and engineering are key to achieving the desired force without compromising safety.