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How Does the Dyson Motor Work?

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Refrigerator:

--- Quote from: rob77 on October 22, 2016, 08:09:49 pm ---it's a 2 pole brush-less DC motor.. it has only 2 poles to get the high RPM (the more poles it has the slower it goes at the same switching frequency).

--- End quote ---
But it's a 4 pole magnet.

oldway:
http://www.dyson.co.uk/vacuum-cleaners/cordless/dyson-v8/engineering-story.aspx

http://www.electronicsweekly.com/market-sectors/power/dyson-vacuums-104000rpm-brushless-dc-technology-2009-06/

SeanB:

--- Quote from: Refrigerator on October 23, 2016, 06:52:31 am ---
--- Quote from: rob77 on October 22, 2016, 08:09:49 pm ---it's a 2 pole brush-less DC motor.. it has only 2 poles to get the high RPM (the more poles it has the slower it goes at the same switching frequency).

--- End quote ---
But it's a 4 pole magnet.

--- End quote ---

4 poles means 2 N poles and 2S poles, so just 2 actual poles. Then you make the stator slightly offset WRT the coils ( cut 2 of the laminates on the one end to be slightly shorter so a larger air gap there) and, just like a regular shaded pole motor, it will only run in one direction.

You get 400Hz aircraft blowers with the same size, and those suckers do move air, though they also scream doing so.

rob77:

--- Quote from: SeanB on October 23, 2016, 07:42:34 am ---cut 2 of the laminates on the one end to be slightly shorter so a larger air gap there

--- End quote ---

that would make sense ;) thanks  :-+ i think that's how it's done. a shaded pole would induce a significant drag at that speed. and a software solution in the controller would delay the spin-up.

Zero999:
Technically it's not a DC but an AC motor.

The person who created the video appears to be pretty clueless. His experiment comparing it to a stepper motor is BS. Of course a stepper motor is optimised for high torque at low speed, so it will generate a relatively high voltage when its shaft is turned slowly. The Dyson hair drier motor is designed for high speed, so it will generate a fairly low voltage, even if turned faster than the stepper motor.

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