Using Hydraulics to generate electricty

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Discussion Overview

The discussion revolves around the use of hydraulic cylinders to convert mechanical movement into electricity. Participants explore various methods and components involved in setting up such a system, including the roles of turbines, generators, and hydraulic fluid. The scope includes theoretical considerations and practical applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks clarity on how hydraulic cylinders can convert mechanical movement into electricity, mentioning the need for a motor and generator.
  • Another participant suggests using a turbine and a generator, emphasizing the importance of valving to ensure fluid travels through the turbine in one direction during oscillation.
  • A different participant recalls that hydraulic systems were considered for harnessing wave power, proposing that smaller systems might benefit from using engine oil pumps or hydraulic gear motors instead of turbines, while noting potential issues with seal tolerances.
  • One participant outlines a process where fluid pushes a piston, leading to reciprocation that is converted into rotary motion, which is then fed to a generator to produce electricity.
  • Another participant expresses skepticism about using a linear actuator directly for electricity generation, arguing that converting linear motion to rotary motion and back could be inefficient due to mechanical losses.

Areas of Agreement / Disagreement

Participants present multiple competing views on the efficiency and practicality of different methods for converting hydraulic motion into electricity. There is no consensus on the best approach or the effectiveness of various components.

Contextual Notes

Participants mention potential limitations related to the efficiency of mechanical gearing and the compatibility of auto parts with hydraulic systems, but these aspects remain unresolved.

qaliq
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I was wondering if someone could help me here. I would like to understand how hydraulic cylinders can be used to convert mechanical movement (say the up and down motion of something for example) into electricty. I understand you probably need a motor and a genertor but I can't seem to find any information about how to set up the system or how the individual componenets work. Any help would be appreciated!

Thanks
 
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Well, hydraulic fluid is a fluid, so you'd just use a turbine and a generator. I don't really know what you have in mind, but if you have an oscillation that the cylinder would be absorbing, you'd probably want to have some valving to make the fluid always travel through the turbine in the same direction.
 
I believe that this was one of the methods that they looked at for harnessing wave power, before settling on air compression instead. On a small scale, I think that using an engine oil pump, power steering pump or a hydraulic gear motor with mechanical drive would be more effective than a turbine (and definitely cheaper). Matching the fluid to the tolerances of the seals can be a problem if using auto parts, though.
 
fluid pushes the piston-piston reciprocates-reciprocation is converted into rotory(by oscillatory or crank mechanism)-fed to generator-electricity comes out.
 
I don't know of any way a linear actuator (cylinder) could be used to directly generate electricity. At some point it would have to be converted to a rotary motion from which a traditional generator (electic motor) would be used to create electricity. I believe most large wind turbine generators rotate a passive hydrostatic (hydraulic closed loop pump-to-motor) arrangement. In short, mechanicl rotary motion to hydraulic rotary motion to rotating shaft of a generator.

I don't believe converting rotary motion to a linear reciprocating motion and then back to rotary motion of a generator shaft would be as efficient due to losses in the mechanical gearing involved. Certainly do-able but not the easiest way to go about it.
 

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