Talk:DC injection braking

DC injection braking was a Engineering and technology good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.

Article milestones
Date	Process	Result
May 17, 2012	Good article nominee	Not listed

reference deletion[edit]

I am the author who created this page and the information written is taken out of application example qouted in the link , why is it considered as commercially motivated when the information is taken out of the application page and the page is a application example and not a marketing paper or and advertisement, Their is ABB soft starter manual reference in motor soft starter wiki page (also added by me ) , it is usefull for general public to know about the product , deleting this source from which information is refered is not right . Do let me know The link http://kimo.de/index.php?file=anwend/bremsen/bremsgeraete-06-10-11.html&lang=EN Please also not that they have provided the copyrights to the picture being put too.

Shrikanthv (talk) 09:53, 8 March 2012 (UTC)[reply]

Yes, that other source is unreliable also. I removed it. Joja lozzo 21:05, 8 March 2012 (UTC)[reply]

But MR Jolalozzo , the whole article is based on the information from the link! how is it unreliable ? Shrikanthv (talk) 08:51, 11 March 2012 (UTC)[reply]

Please see the policy on reliable sources, especially the sections on primary sources and self-published sources. We need good secondary sources, not a product manufacturer's document. If you disagree, you can get other opinions about the source here: Wikipedia:Reliable sources noticeboard. If you are correct and that single source is the only one available for the article (and we determine that it is not reliable) then we should delete it all. Joja lozzo 16:20, 11 March 2012 (UTC)[reply]

Have you looked at the secondary source referenced by the Kimo doc: Schemanske, R: Electronic Motor Braking. IEEE Trans IA, Vol. IA-9, No. 5, Sept/Oct 1983? Joja lozzo 16:24, 11 March 2012 (UTC)[reply]

I see a number of statements in the article for example, comparing friction brakes with DC braking, about DC injection creating a stationary magnetic field, or discussing static torque, that are not mentioned in the KIMO Industrie-Elektronik GmbH source. If the article depends on this source how does the source support that content?

I also see that the article promotes Kimo's products ("KIMO has developed a series of electronic braking choppers which can be especially used to subsequently increase the braking power of a frequency inverter." and "This can be solved by using ... fully regenerative frequency inverters as implemented by KIMO with the TRANSOMIK U2 series."). This would not be found in a properly published, peer-reviewed technical paper. Joja lozzo 16:46, 11 March 2012 (UTC)[reply]

GA Review[edit]

This review is transcluded from Talk:DC injection braking/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: Pyrotec (talk · contribs) 20:53, 16 May 2012 (UTC)[reply]

I will review. Pyrotec (talk) 20:53, 16 May 2012 (UTC)[reply]

GA review – see WP:WIAGA for criteria

Is it reasonably well written?
A. Prose quality:
OK.

B. MoS compliance for lead, layout, words to watch, fiction, and lists:
The WP:Lead is intended to both introduce the article and summarise the main points. The Lead provides a good introduction, but does not summarise all the main points of the article. (The article is really too short, the Lead is almost 50% that of the body of the article).
Is it factually accurate and verifiable?
A. References to sources:
Only the Lead has references to sources: one source to be precise.

B. Citation of reliable sources where necessary:
None of the claims in the body of the article have any sources.

C. No original research:
Possibly not.
Is it broad in its coverage?
A. Major aspects:
The circuit diagrams shows half-wave rectified DC voltage applied to two phases of a three-phase motor, which is fine. The article itself has no discussions of single-phased and/or three-phased motors and whether this technique is equally applicable to both types, nor the method of producing the DC voltage. It claims simply without references that "the higher the voltage that is applied, the stronger the braking force and holding power", but it provides no discussion of the relationship between applied voltage and braking force / stopping power. Note: the circuit diagram clearly indicates that the DC braking voltage is obtained directly from two phases of the motor's normal running supply and will therefore be of a similar magnitude. There is no consideration of the stator heating that will result from a DC voltage braked motor (the fan-assisted cooling produced during normal operation will be absent), nor the noise/hum of applied DC voltage. Note: the module appears to have two adjustable circuits A and B which presumably control the start and finish of DC-voltage breaking. The article claims without references that friction brakes require actuation and add complexity to the system. Friction brakes have been used successfully for many decades: on domestic appliance such as spin driers, which have door interlocks, on industrial machines which have microswitches on access doors and/or emergency stop buttons, lathes (some of which have foot operated breaks); on large machines in which an electromagnet is used to override a spring-operated friction brake, killing the supply to the electromagnet allows the spring to close the brake. Standardised "DIN rail control modules", such as the one shown to provide DC braking, are presumably also available to provide electrical or pneumatic friction brake controls, and their incorporation into an AC motor's supply circuits appears to be no more complex than adding DC braking modules. Such claims that DC voltage braking control circuits are less complex than friction control brake circuits need to be supported with verifiable references.

B. Focused:
Somewhat over focused on the "claimed" benefits of DC voltage braking.
Is it neutral?
Fair representation without bias:
DC braking is merely claimed to be better and less complex that mechanical braking. Mechanical wear of brakes may be a valid point, but its also unquantified and unreferenced.
Is it stable?
No edit wars, etc:
Does it contain images to illustrate the topic?
A. Images are copyright tagged, and non-free images have fair use rationales:

B. Images are provided where possible and appropriate, with suitable captions:
Overall:
Pass or Fail:
This article appears to be a cut-down version of the German-language wikipedia article [1], but with far fewer references and one fewer schematic diagram. The German article is unassessed. I consider that this particular article is Stub-class or Start-class (possible the latter) at most. So, I will not be awarding GA-status.

Pyrotec (talk) 13:29, 17 May 2012 (UTC)[reply]