Author Topic: wtf is a digital motor?  (Read 19093 times)

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Offline Ferroto

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wtf is a digital motor?
« on: May 01, 2011, 05:20:58 pm »
[youtube]6kcGltYWz3k[/youtube]
 

Offline Zero999

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Re: wtf is a digital motor?
« Reply #1 on: May 01, 2011, 05:27:11 pm »
It sounds like a marketing term for a brushless motor.

I think it's a good idea: no brushes to wear out, lower power consumption, lighter and will warm up the room much less on a hot day.

The video is wrong about Faraday: a brushless motor still works on the principle of electromagnetic induction.
 

Offline Kiriakos-GR

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Re: wtf is a digital motor?
« Reply #2 on: May 01, 2011, 05:53:59 pm »
Well In my everyday life I name as digital motor the stepping motors ,
found in printers mostly.

 
 

Offline tecman

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Re: wtf is a digital motor?
« Reply #3 on: May 01, 2011, 05:58:21 pm »
Dyson's is not even a stepper, but a PM, electronically commutated motor.  Brushless motor to most of the world, and just marketing hype by Dyson.  And selling "no carbon emissions" is just such total BS.  It is not CO2, but perhaps a few tens of grams in 5 years of carbon dust.  That will save the world from global warming.

It no wonder that this guy took a thousand prototypes before he had a working model (reference to his TV commercial).

paul
« Last Edit: May 01, 2011, 06:02:34 pm by tecman »
 

Offline Ernie Milko

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Re: wtf is a digital motor?
« Reply #4 on: May 01, 2011, 06:09:07 pm »
And Dyson cleaners are crap!
 

Offline Zero999

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Re: wtf is a digital motor?
« Reply #5 on: May 01, 2011, 06:13:05 pm »
And selling "no carbon emissions" is just such total BS.  It is not CO2, but perhaps a few tens of grams in 5 years of carbon dust.  
Yes total bollocks, the digital switching has nothing to do with carbon emissions.

There's some truth in it being more efficient meaning lower carbon emissions but it won't be zero.

And Dyson cleaners are crap!
Ever owned one? It's true some older models suffered from poor build quality but the newer models are very good.
 

Offline Ernie Milko

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Re: wtf is a digital motor?
« Reply #6 on: May 01, 2011, 06:35:19 pm »
Ever owned one? It's true some older models suffered from poor build quality but the newer models are very good.

Well, obviously. I wouldn't have made that statement otherwise.
My wife seems to get pulled-in by the sales pitch, which means we have owned several over the last ten years or so.
I'm the one who ends up having to dismantle the bloody things when they block.
No loss of suction my arse.
I took the last one to the tip.

I can, however, speak very favourably of Henry and Vax.
 

Offline TheWelly888

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Re: wtf is a digital motor?
« Reply #7 on: May 01, 2011, 06:40:10 pm »
Our Dave's already mentioned it in a video blog

https://www.eevblog.com/forum/index.php?topic=1959.0
You can do anything with the right attitude and a hammer.
 

Offline Zero999

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Re: wtf is a digital motor?
« Reply #8 on: May 01, 2011, 07:19:23 pm »
Well, obviously. I wouldn't have made that statement otherwise.
My wife seems to get pulled-in by the sales pitch, which means we have owned several over the last ten years or so.
I'm the one who ends up having to dismantle the bloody things when they block.
No loss of suction my arse.
I took the last one to the tip.

I can, however, speak very favourably of Henry and Vax.
The first Dyson we owned is now on the tip because it fell to pieces. We now have a new one (two months old) and are very happy with the build quality and suction. We still have an old Panasonic but the new Dyson is so good it removes more fluff from our new carpet so we tend to use the old Panasonic everyday and the Dyson for more intensive cleaning. The thing I like about it is the way it doesn't emit loads of dust, like all the other bagged vacuumes I've used or those which use a simple filter to remove the dust.
 

Offline Simon

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Re: wtf is a digital motor?
« Reply #9 on: May 01, 2011, 08:05:50 pm »
that video is voiced over too typical of an advert, total marketing twatery. The motor is not digital but the driving technology may be
 

Offline tekfan

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Re: wtf is a digital motor?
« Reply #10 on: May 01, 2011, 09:14:25 pm »
Carbon emissions - yea right

You probably make more ''carbon emissions'' when you write with a pencil.

But what happens when you use an eraser to erase it. Oh no! I'm causing global warming!!!
One can never have enough oscilloscopes.
 

Offline Neilm

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Re: wtf is a digital motor?
« Reply #11 on: May 01, 2011, 09:19:06 pm »
that video is voiced over too typical of an advert, total marketing twatery. The motor is not digital but the driving technology may be

My grandfathers electric drill has a digital control system, it is either stopped or running at full speed. That IS digital.

Neil
Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. - Albert Einstein
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Online Mechatrommer

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Re: wtf is a digital motor?
« Reply #12 on: May 01, 2011, 11:04:51 pm »
Carbon emissions - yea right
carbon? dont breath! CO2!
It's extremely difficult to start life.. one features of nature.. physical laws are mathematical theory of great beauty... You may wonder Why? our knowledge shows that nature is so constructed. We simply have to accept it. One could describe the situation by saying that... (Paul Dirac)
 

Offline Sionyn

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Re: wtf is a digital motor?
« Reply #13 on: May 02, 2011, 01:13:13 am »
the digital bit is the  mosfets
that it
hardly revolutionary


reminds me of beats audio guff

eecs guy
 

Offline tekfan

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Re: wtf is a digital motor?
« Reply #14 on: May 02, 2011, 01:24:23 am »
OK so most of the stuff in the video is possible but how does a headphone jack work if it doesn't contain any metal contacts?
One can never have enough oscilloscopes.
 

Offline Leo Bodnar

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Re: wtf is a digital motor?
« Reply #15 on: May 02, 2011, 03:58:17 am »
"Digital" means operated by a finger.

digit noun
1 any of the numerals from 0 to 9, esp. when forming part of a number.
2 a finger (including the thumb) or toe.

Offline Simon

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Re: wtf is a digital motor?
« Reply #16 on: May 02, 2011, 07:23:19 am »
the digital bit is the  mosfets
that it
hardly revolutionary


reminds me of beats audio guff



pft what a lot of bollocks ! I like the "audio island" only to see that the output cables obviously have to travel across the whole notebook picking up NOISE. I'm not sure what HP used this for if at all (could be a piss take ?) but if this was advertising material it should be banned
 

Offline Sionyn

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Re: wtf is a digital motor?
« Reply #17 on: May 02, 2011, 01:42:02 pm »
agreed simon its all junk
eecs guy
 

Offline kaptain_zero

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Re: wtf is a digital motor?
« Reply #18 on: May 02, 2011, 11:11:56 pm »
I'd be inclined to suspect it to be a reluctance type motor.....  Nova, another company from Dave land, markets the DVR woodturning lathe with the DVR standing for Digital Variable Reluctance.  A quick check on Wikipedia pulls up this little blurb:

"Electronic driven variable reluctance motor.

An electronic driven variable reluctance motor (Figure below) resembles a brushless DC motor without a permanent magnet rotor. This makes the motor simple and inexpensive. However, this is offset by the cost of the electronic control, which is not nearly as simple as that for a brushless DC motor. "

I base my suspicions on the appearance of the rotor he's holding in that video....

Regards

Christian
 

Offline tecman

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Re: wtf is a digital motor?
« Reply #19 on: May 03, 2011, 01:22:46 am »
Video looks like a PM rotor.  Simplest and cheap for a small motor such as this.

paul
 

Offline scrat

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Re: wtf is a digital motor?
« Reply #20 on: May 03, 2011, 09:02:41 am »
Video looks like a PM rotor.  Simplest and cheap for a small motor such as this.

paul

In the video it seems it's a PM rotor, but here http://www.appliancedesign.com/CDA/Archives/3c4028037aa38010VgnVCM100000f932a8c0____ they say it's a switched reluctance, and from the drawing you see it's single phase. These motors work similarly to a stepper motor, without magnets on the rotor (so achieving very low cost). There must also be a version with PM (see http://www.dyson.com/technology/ddmtabbed.asp there's the drawing, too), mounted on the handheld version of the cleaner (higher power density is needed there).
The photo here http://www.telegraph.co.uk/technology/news/5636349/Dyson-unveils-worlds-fastest-motor-in-new-vacuum.html shows how tiny these motors are, but nothing so special. In this last page, they also say "We are the only company in the world producing a switched reluctance motor.". That's really annoying!
« Last Edit: May 03, 2011, 09:08:22 am by scrat »
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Offline vk6zgo

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Re: wtf is a digital motor?
« Reply #21 on: May 03, 2011, 09:53:49 am »
I have repaired the drive circuits for what could be called a diigital motor".

It used DC pulses to produce a rotating magnetic field to operate an induction motor by switching the pulses to successive windings situated

in a circular pattern surrounding the rotor.

Initially,the drive circuit set up the rotating field at an arbitrary rate,but when it was running,it received feedback from Hall Effect

sensors,indicating the rotor position. This information was then used to stabilise the motor speed.

Although this device used Op Amps & a switchmode regulator IC to perform its marvels,it could be done with virtually all of the circuitry

in the digital domain.

These motors rotated at very high speeds ,& were used to drive "Turbo vacuum pumps" in a Chemistry lab.


VK6ZGO
 

Offline Sionyn

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Re: wtf is a digital motor?
« Reply #22 on: May 03, 2011, 01:33:58 pm »
here go the carbon emissions thing again

eecs guy
 

Offline Zero999

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Offline vk6zgo

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Re: wtf is a digital motor?
« Reply #24 on: May 04, 2011, 03:04:51 am »
http://en.wikipedia.org/wiki/Switched_reluctance_motor

The thing described in this link is near as dammit to the device I referred to in my post above.

It's a glorified Induction motor,with the rotating field supplied by a dc switching circuit instead of the ac mains.

VK6ZGO
 


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