Talk:Electric motor

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Old threads moved to archive[edit]

The talk page was getting quite long even by modern Wikipedia standards. The older threads are at Talk:Electric motor/Archive 1 --Wtshymanski (talk) 21:47, 15 October 2009 (UTC)[]

Last few years moved to Archive 2. --Wtshymanski (talk) 05:01, 1 May 2020 (UTC)[]

Superfluous refs[edit]

Some of the points in this piece have >10 references. This makes no sense. Unless a point is controversial, a single secondary source is all that is necessary. I encourage involved editors to clean this up. Readers will thank us. Lfstevens (talk) 22:31, 14 June 2018 (UTC)[]

Request for some specific statements : Electric Motor Engineers, Help![edit]

Regarding permanent magnet motors:

  • I believe that the torque-per-volt/amp/watt is dependent on the BHMax of the magnets used. Is that true?
  • If true, then permanent motors have limitations on "small size" and "energy efficiency" based on the composition of their magnets.
  • If that is true, then for size and energy efficiency, NIB >> SmCo >> Alnico >> Ferrite >> Soft Iron
  • If that is true, are there approximations or upper limits for the energy efficiency given the available magnetic material?

The delivered torque or size is clearly dependent on many other factors (nature and materials of the windings, nature and materials of the electromagnets and cores, gearing, internal/external stator/rotors, etc.) but I expect some things might be "rules of thumb" for motor engineers Clear, declarative sentences, or a nice table, might be nice:

Characteristics of PM Motors for given PM materials
all values are approximations
Material BHMax Typical Energy efficiency (Jkinetic vs Jemf) Typical Space efficiency (M3 vs Jemf)
NIB 30-35 ??? ???
SmCo 20-25 ??? ???
AlNiCo 5-6 ??? ???
SrFe ... ... ...
BaFe ... ... ...
Fe ... ... ...


Any in-the-know folks want to chime in?

Riventree (talk) 11:50, 11 June 2020 (UTC)[]

Electric Motor-Driven Systems[edit]

I am looking for inputs. The the term «Electric Motor-Driven Systems» seems to me a concise and important concept in the global analysis of energy technically, economically and environmentally. Do you also think it makes sense to create an article with this lemma? Or would you incorporate it somewhere in an existing article, and if so, where? Sources: https://www.energiestiftung.ch/files/downloads/energiethemen-energieeffizienz-industriegewerbe/ee_for_electricsystems-2-.pdf https://www.iea.org/reports/energy-efficiency-policy-opportunities-for-electric-motor-driven-systems Repinrepin (talk) 13:08, 15 September 2020 (UTC)[]

No: What would be the purpose of the proposed article? Since an electric motor driven system could be anything from a wristwatch to a warship, there doesn't seem to be much of an organizing principle to go on for an article. --Wtshymanski (talk) 19:19, 18 September 2020 (UTC)[]
No: Way too broad and diffuse in scope for a separate article. An "Applications" section in this article would suffice. --ChetvornoTALK 19:32, 18 September 2020 (UTC)[]
Yes: I like the concept. The key point is that there are energy savings opportunities at the system level that are much larger than the 10 to 20% efficiency gain that might be possible with improving motors. There are references that address that systematically. Ccrrccrr (talk) 01:31, 19 September 2020 (UTC)[]
Except that the title of the proposed article is not "Energy savings in electric motor-driven systems", it is "Electric motor-driven systems". So the topic of energy savings would just be a tiny section buried in a huge, diffuse article covering general information about all systems incorporating electric motors. --ChetvornoTALK 06:15, 19 September 2020 (UTC)[]
That's a good point. I like the idea of working on the title further better than the idea of "a huge diffuse article covering general information about all systems incorporating electric motors." The latter would be a terrible idea.Ccrrccrr (talk) 14:55, 22 September 2020 (UTC)[]
Why does the topic of energy savings in electric motors, which clearly belongs in this article, require a separate article, which will entail a lot of redundant explanation, and make it more difficult for readers to find? One more section in this article will not increase its size much. If it is decided that it will not fit in this article, we also have Energy efficiency, Efficient energy use, Electrical efficiency, Energy conversion efficiency, Energy efficiency in transport and Environmental impact of electricity generation, to put it in. --ChetvornoTALK 18:09, 22 September 2020 (UTC)[]
No: It is silly to separate motor from motor driven system. What is the point of motor if it isn't connected to a motor driven system.Constant314 (talk) 03:28, 21 September 2020 (UTC)[]
No: per WP:UCRN. Wikipedia is not written in academic/bureaucrat-ease. Fountains of Bryn Mawr (talk) 11:56, 21 September 2020 (UTC)[]

Small clarification needed in Electromagnetism Section under Goodness Factor[edit]

In the Goodness Factor formula, the symbol "Sigma" is not defined, and I am not qualified to suggest its definition.74.195.124.209 (talk) 12:49, 26 February 2021 (UTC)[]

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