Talk:Brushless DC electric motor

commutator section
There are several parts wrong in this section. either the stator or rotor fields can be commutated, the term "commutator" does not only apply to the brushed commutator, but also applies to the brushless commutator that changes the field in the stator of a brushless DC motor. Note that these changes also need to be made in many accompanying articles. Here are some lay references, there are plenty of academic references as well, but I don't foresee this will be in dispute. https://www.machinedesign.com/automation-iiot/article/21832366/motion-design-101-electronic-commutation, http://fab.cba.mit.edu/classes/961.04/topics/brushless_DC1.pdf, https://buildingenergy.cx-associates.com/understanding-electronically-commutated-motors Skeptonomicon (talk) 16:05, 10 September 2020 (UTC)


 * There is no longer a Brushless DC electric motor section but I have reviewed the Brush commutator and Brushless solution sections and no longer see the identified problem. ~Kvng (talk) 18:55, 20 May 2024 (UTC)

vice
I hope I am not too far off base here. Please be gentle as I am a noob here. I've quoted the segment of the article and bolded the exact text I think needs clarification. While the word "vice" has three common meanings, none of them seem to apply here.

''Applications

BLDC motors can potentially be deployed in any field-application currently fulfilled by brushed DC motors. Cost and control complexity prevents BLDC motors from replacing brushed motors in most common areas of use. Nevertheless, BLDC motors have come to dominate many applications: Consumer devices such as computer hard drives, CD/DVD players, and PC cooling fans use BLDC motors almost exclusively. Low speed, low power brushless DC motors are used in direct-drive turntables. High power BLDC motors are found in electric vehicles and some industrial machinery. These motors are essentially AC synchronous motors with permanent magnet rotors.

The Honda Civic hybrid car uses a BLDC motor to supplement the output of the internal combustion engine when the extra power is needed. It is also used to start the engine via a conventionalstarter and solenoid method.''

Gamaray?
"In a BLDC motor, the electromagnets do not move; instead, the permanent magnets rotate and the gamaray remains static." —Preceding unsigned comment added by Ericg33 (talk • contribs) 08:29, 30 October 2009 (UTC)

Section on inverters
See the large removal in this edit http://en.wikipedia.org/w/index.php?title=Brushless_DC_electric_motor&diff=483426920&oldid=483368233 (the other stuff is tweaks)

Slightly confused section - a BDC motor needs an inverter and control stuff to make it work - that much is clear. I removed the text-book stuff about "first we should consider".

Most of the description appears to be that which should be found in articles on Inverter, or VVVF drive, of Vector drive, or whatever people call them -

There was some specialised unreferenced stuff - eg "In addition, using a trapezoidal control leaves one leg undriven at all times, allowing for back-EMF-based sensorless feedback." -this needs referencing with context if it is to be in the article.

There were other problematic sentences such as "A motor can be optimized for AC (i.e. vector control) or it can be optimized for DC (i.e., block commutation)" - the issue here is that there is no clue and no article saying what "block commutation" is.. I'm not sure what it is trying to say, and it appears vaguely contradictory with earlier statements. The term "trapezoidal EMF" is also unexplained.

One bit that is not clear enough
 * Another very important issue, at least for some applications like automotive vehicles, is the constant power speed ratio of a motor (CPSR). The CPSR has direct impact on needed size of the inverter. Example: A motor with a high CPSR in a vehicle can deliver the desired power (e.g., 40 kW) from 3,000 RPM to 12,000 RPM, while using a 100 A inverter. A motor with low CPSR would need a 400 A inverter in order to do the same.

There is no article CPSR - and the text doesn't currently make that much sense.

Someone else should look at this - also the article makes the assumption that BDC motors always use a Permanent magnet synchronous motor - as far as I know this is correct  -though contradictory examples will probably exist - the main issue with this is that it might be better to cover the motor science at Permanent magnet synchronous motor and link to that article from the page.Oranjblud (talk) 21:23, 22 March 2012 (UTC)


 * CSPR and inverter no longer appear in the article. ~Kvng (talk) 19:10, 20 May 2024 (UTC)

Rare earth magnets
I am not exactly a motor expert so correct please, but I would understand that the real revolution in creating BLDC motors with incredibly high power to size ratios has come about with the advent of rare earth permanent magnets. The electronics and the rare earth magnets are the two technologies that enable the hi-power density applications such as electric cars, Segways, drone copters, etc, etc. I think an article that fails to mention neodymium/iron/boron alloy magnets leaves a significant gap in the knowledge of the reader. Here is a typical reference science direct


 * neodymium magnets is mentioned in the lead and I have added the suggest ref there. ~Kvng (talk) 19:17, 20 May 2024 (UTC)

too much jargon in opening
"The controller times commutation (hence rpm) and creates current waveforms (hence torque)."

Say What?? Is that even a sentence?

The opening paragraph here needs major rewrite to avoid use of highly specialized technical jargon.

174.103.146.141 (talk) 01:10, 31 March 2017 (UTC)

forgot to log in Gjxj (talk) 01:11, 31 March 2017 (UTC)