Shock from Dyson handheld battery vac...

[Deuce]

So, here is one to debate.

Wifey bought one of the cordless V8 dyson vacs, on the basis that all her friends have one. It's pretty handy.

But today I discovered an unusual feature. If it detects the motor is working too hard (in this case as the filter was blocked with dust), it will switch off until you release the trigger. However... As it cuts out it sends a hefty shock back out the charging port, sufficient to transfer into the palm of the user - in this case, me! After the first and second shock, I took it over to a radiator and held the charging port next to it, sure enough each time it cut out it would arc to the radiator. Each time I released the trigger before it cut out, no arc.

So, did Dyson protect against this problem, but only if the trigger is released, not if the vac cuts itself off - basically an oversight? Or is it perhaps some cruel way of forcing the user to clean the filter?

I did google, found this and others: https://forums.whirlpool.net.au/archive/2531043

Theories? I suspect the stupidly fast (100,000+ rpm) motor builds up quite some floating voltage which might be responsible for this 'feature'.

 

[buzzlightyear]

Stop crying deuce, it is only a dyson hoover .its not a electric chair .
i might put that to mr dyson it could go into prouduction.

 

[Deuce]

Stop crying deuce, it is only a dyson hoover .its not a electric chair .
i might put that to mr dyson it could go into prouduction.

A "Dyson". "Hoover"?

And yes, I am aware that there are far more glorious ways to burst through the pearly gates than clutching a battery powered vac whilst complaining of an 'ouchie'

 

[PEG]

That's what you get,from embracing technology...never had so much as a sideways look,from me Ewbank

 

[Deleted member 9648]

Anyone daft enough to buy a Dyson deserves a shock, that blokes a genius. Millions of people conned into forking out loads of dosh for a pile of tat. Genius indeed.

 

[static zap]

...... Dyson ..... that blokes a genius. Millions of people....... conned ......

(..apologies for butchery..)
Yep he knows how to appeal to the inner engineer in many males ..
... Not so popular with pro-cleaners
-- Expensive / Heavy / complicated to strip.--
Who may need to label all the parts
with coloured insulation tape , to get it back toghether !
( a camping with a frame tent tactic - from yester year )

 

[Deuce]

Anyone daft enough to buy a Dyson deserves a shock, that blokes a genius. Millions of people conned into forking out loads of dosh for a pile of tat. Genius indeed.

Don't like the uprights, never got on with them at all. The handhelds though... I can't think of anyone who makes a better handheld, the power of the dyson motor is undeniably great.

Not sure why I'm standing up for the fella, having been electrocuted twice by his vacs

 

[buzzlightyear]

Not sure why I'm standing up for the fella, having been electrocuted twice by his vacs

fool .once bitten twice shy .no.....

 

[Rpa07]

(..apologies for butchery..)
Yep he knows how to appeal to the inner engineer in many males ..
... Not so popular with pro-cleaners
-- Expensive / Heavy / complicated to strip.--
Who may need to label all the parts
with coloured insulation tape , to get it back toghether !
( a camping with a frame tent tactic - from yester year )

You got a winner for that Static - the cherry on the top took me back 40 years to the colour coded assembly in the rain!

 

[Deleted member 9648]

Yes, I confess I've never used one of the cordless jobs so the post was rather uninformed. However when it comes to the uprights, don't get me started, simply awful contraptions.

 

[Deuce]

Yes, I confess I've never used one of the cordless jobs so the post was rather uninformed. However when it comes to the uprights, don't get me started, simply awful contraptions.

The cordless have their issues too, other than zapping me.. For one they're extremely difficult to empty, and the battery life between charges is pretty dire.

On the flip side, the motor does spin at over 100,000rpm - so when it does work, it's really very powerful at least.

 

[Silly Sausage]

On the flip side, the motor does spin at over 100,000rpm - so when it does work, it's really very powerful at least.

Sounds like you want to be careful where you point that thing ...

 

[Deuce]

Sounds like you want to be careful where you point that thing ...

I'm a guy. The first thing I did to test the powerrrrrrr was obviously push it against my arm to see.

As I'm also a geek... The suction fan is 55mm diameter, so it has a circumference of 141.1mm. At 108,000 rpm. That means that each minute the outer tips of that fan are travelling a distance of 15.24km, or 567mph. So I guess they had to work quite hard to avoid the risk of a disintegrated motor/fan shooting through the housing

 

[static zap]

....... 15.24km, or 567mph. So I guess they had to work quite hard to avoid the risk of a disintegrated motor/fan shooting through the housing

Not quite breaking the sound barrier (depending on air conditions)
..I too remember similar calcs for a 4-1/2" 115mm angle grinder disk
doing near 600mph ... (why they are hard to break at speed)

 

[Deuce]

Not quite breaking the sound barrier (depending on air conditions)
..I too remember similar calcs for a 4-1/2" 115mm angle grinder disk
doing near 600mph ... (why they are hard to break at speed)

Another commonplace comparison - most modern turbo chargers in diesel cars spin at around 200,000 rpm under full duty. Apparently most turbo compressors are around 40mm dia so I guess the trailing edges are breaking the speed of sound. The aftershock effect of that would normally destroy a compressor but I guess they channel the air through in such a way as to avoid that effect.

 

[CACJL]

So, here is one to debate.

Wifey bought one of the cordless V8 dyson vacs, on the basis that all her friends have one. It's pretty handy.

But today I discovered an unusual feature. If it detects the motor is working too hard (in this case as the filter was blocked with dust), it will switch off until you release the trigger. However... As it cuts out it sends a hefty shock back out the charging port, sufficient to transfer into the palm of the user - in this case, me! After the first and second shock, I took it over to a radiator and held the charging port next to it, sure enough each time it cut out it would arc to the radiator. Each time I released the trigger before it cut out, no arc.

So, did Dyson protect against this problem, but only if the trigger is released, not if the vac cuts itself off - basically an oversight? Or is it perhaps some cruel way of forcing the user to clean the filter?

I did google, found this and others: https://forums.whirlpool.net.au/archive/2531043

Theories? I suspect the stupidly fast (100,000+ rpm) motor builds up quite some floating voltage which might be responsible for this 'feature'.

The motor is a high frequency squirrel cage induction type fed buy an inverter, so I suspect this static caused by friction with the carpet.