Dyson V8 bypass sensors and alternative power supply

[gantons]

i want to repurpose a dyson v8 motor for a hobby-specific type of vacuum. so i want this thing to run normally without requiring any of the components outside of what comes with the motor kit (motor/housing, and PCB)

i purchased this motor, and here is a link to another one that shows additional connectors/sensors (which is where im getting confused)..

what i want to do is power this independently without the PCB checking for a canister/bin, or battery temp, or whatever else there may be. i plan to power this via power tool battery and would like a momentary switch to be the only thing i need to add. however, i'm not sure how to determine the startup current required, or how to bypass the extra wires. so far i've tried 10amps and maybe 5v to get it going by connecting clips to the two big square terminals, but i think those smaller holes (if you see the second link, red and white wires) are required for it to allow power.

i'm also very unsure of what type of switch i need. i have a momentary switch but it doesn't have any info on it, and i have a rocker switch which has the following information on it: "KC 672A 250V 2A AC" and i have no idea if this is sufficient.

here is a link to some specs from a non-dyson website that suggests it uses 12amps, but i can't imagine its constantly drawing 12amps. i have no idea about any of this though.


any help is really great, thank you!

 

[Bluejets]

That could end up being beyond your ability.
Might be better to explain what you are trying to achieve with the motor and an alternative (simpler) method would more than likely come to mind.

 

[gantons]

That could end up being beyond your ability.
Might be better to explain what you are trying to achieve with the motor and an alternative (simpler) method would more than likely come to mind.

A vacuum that uses a mason jar for the canister. Ill 3D print the custom housing for it, which isn't critical at this point, getting the dyson motor to run is first. I did try this with a 3D printed impeller but without a brushless motor, and the way I've attempted so far, I haven't been able to create enough suction.

 

[kellys_eye]

here is a link to some specs from a non-dyson website that suggests it uses 12amps, but i can't imagine its constantly drawing 12amps. i have no idea about any of this though.

Vacuum is related to power and 12A (even at 12V) only equates to <150 watts. Small in comparison to your standard (mains powered) vacuum that might consume 1000W or more. Ok, that doesn't count for the efficiency of the 'cyclone' (or whatever) arrangement used to suck the dirt up but you still won't get decent performance unless you have 'power'.

Drawing 12A for 40 minutes only means a battery of 10Ahr-ish which seems to match the type of battery used in the device anyway.

Can you get hold of an old vacuum and trace the wiring? I doubt they detect the canister positioning - most likely they are looking at battery performance and measuring things like current and heat (for overload issues) but without a schematic the best you can do is follow wiring back to 'whatever' in a full machine.

 

[dave9]

Dyson V8's run at nominal 21V (6 cell battery) and 2800mAh, 40 min on standard mode w/o brush tool, but roughly 11 min on turbo mode.

Certainly there are losses but before them that's 320W... and it's still too weak.

I'd think about getting a 40V or higher, brushless leaf blower for the project instead. On turbo those typically have around 10 minutes runtime, so approx double the suction (I know, the math can't be that simple but still more suction). You'll have the entirety of the control circuit and then may just need to work out battery management if not a complete protection circuit within the battery pack.

OR... as crazy as it seems, if you want to convert to a canister vac, you could get a cordless canister vac and mod from that, but again it probably needs have 40V or higher battery to get the job done.

 

[Delta Prime]

want to repurpose a dyson v8 motor for a hobby-specific type of vacuum

Are you building a vacuum chamber out of a mason jar?
Yes I'm crazy.
Once you do get a proper power supply. How far would you like to pump down your vacuum chamber, before implosion?
You're sucking the atmosphere out of your mason jar(That's how it reads to me) & if so..... Then of course you know the atmosphere is made up of gas molecules. The distance between these molecules is called the Mean Free Path (MFP) & is directly proportional to pressure(or lack there of).
Normal atmospheric pressure is defined as 1 atmosphere. 1 atm = 14.6956 psi = 760 torr=101.325 kPa.
Vacuum instrumentation Pirani
or Bourdon.
Dependent on your effective operating range of your vacuum chamber.

 

[kellys_eye]

Most hobby specific vacuum requirements rotate around air removal from casting plastics or bagging stuff for moulding (fibreglass or carbon etc) so don't come close to 'perfect' vacuums which, anyway, can't be achieved using a vacuum cleaner motor (the seals aren't anywhere tight enough).

@dave9 idea of using a leaf blower is great - never considered that! - as those things can suck start a Jumbo jet.

 

[ivak245]

If you are just trying to vac out a vessel. refrigeration vacuum pumps can be bought cheaply and are designed to run for many hours.
A simple in line valve can be used for control.