Talk:Electro-hydraulic actuator

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A fact from Electro-hydraulic actuator appeared on Wikipedia's Main Page in the Did you know column on 6 August 2009 (check views). The text of the entry was as follows:

Did you know... that electro-hydrostatic actuators can replace the hydraulic plumbing of an aircraft with electrical wiring, leading to a "power-by-wire" design?

A record of the entry may be seen at Wikipedia:Recent additions/2009/August.

Wikipedia

Electro-hydrostatic actuators EHAs are not the latest technology

EHAs are not the latest technology

C. W. Helsley, Jr., "Power By Wire for Aircraft - the All-Electric Airplane", SAE, #771006, February 1977this shows the hydraulics have been eliminated and a new section or connection to linear actuator should be made. Electro-hydrostatic actuators (EHAs)are not the latest technology

Wdl1961 (talk) 01:17, 7 August 2009 (UTC)[reply]

quote ""mechanical servo-power package (MSPP) to these functions will meet the power and frequency response requirements, and will save additional weight. The MSPP consists of an electric motor, an adapter gearbox, a flywheel, a mechanical controller, and a mechanical hinge. ""

Wdl1961 (talk) 01:47, 7 August 2009 (UTC)[reply]

Hydraulic vs. Hydrostatic

Why is the title of the article "Electro-hydraulic actuator" when it describes only what an "Electro-hydrostatic actuator" is?

I'm pretty sure that hydraulic and hydrostatic are not synonyms. Shouldn't we change the article name and, more importantly, write a paragraph explaining the difference between electro-hydraulic actuators and electro-hydrostatic actuators? — Preceding unsigned comment added by 91.13.28.133 (talk) 20:29, 25 May 2016 (UTC)[reply]

Hydraulic commonly is a synonym for hydrostatic. Also I'm unaware of any hydrokinetic counter-examples to this. Andy Dingley (talk) 19:05, 30 October 2018 (UTC)[reply]

The first post in entirely correct, and the second post wrong. There are fundamental differences between hydraulic and hydrostatic actuator technologies. The entire article requires re-writing. The following links would be very helpful:

Electrohydraulic_servo_valve

https://www.moog.com/products/actuators-servoactuators/actuation-technologies/electrohydrostatic.html

https://www.hydraulicspneumatics.com/cylinders-actuators/electrohydrostatic-actuation-energy-efficient-option

https://r.search.yahoo.com/_ylt=Awr9Dt.6m5VdQcwAdHZXNyoA;_ylu=X3oDMTByNDZ0aWFxBGNvbG8DZ3ExBHBvcwM2BHZ0aWQDBHNlYwNzcg--/RV=2/RE=1570114618/RO=10/RU=https%3a%2f%2fpdfs.semanticscholar.org%2f4efa%2f883f7af8d08acb314ba6e5dbc7af8f9ec476.pdf/RK=2/RS=zZFN.u2bnPQImif_NakQLQy4kKc-

https://web.archive.org/web/20080517035145/http://www.yf.com/actuation_electrohydrostatic.cfm

200.68.142.20 (talk) 07:18, 3 October 2019 (UTC) baden k.[reply]

Response time of EHAs

I suggest adding details about the response time of the actuators and the systems that use them.

Also, it might be good to link to a description of the technology used in the actuators. Pneurd (talk) 12:17, 28 January 2018 (UTC)[reply]

Stepper motors?

Why does this article claim, "The primary development that lead to the possibility of EHAs was the precision feedback controlled conventional motor, or high-power stepper motor." I know of no use for stepper motors here, nor how they'd even be used. The purpose of an electro-hydraulic system (the topic of this article) is that a relatively simple electric motor provides the power, the precision comes from hydraulic valves. There's just no need for an electrical positioning system such as a stepper, torque motor or similar. Nor does the cited reference support this. Andy Dingley (talk) 19:04, 30 October 2018 (UTC)[reply]