Dyson DA 001 cyclone vacuum cleaner

[N Cook]

I took pity on this m/c dumped and had been rained on, half a pint of water
in the lower casing.
I've seen a hose attached to these beasts but took me 5 minutes of head
scratching to discover that secret, as no external hose attachement point.

Powered for 2 seconds, sounded ok but probably an excessive chemically/
ozone smell. Then tipped upside

down
to get in case and water flowed out but had not been enogh to invade the
motor. Needs
Torx 10 and 15 drivers to remove casings.

Fancy looking design appearance but the motor to me looks like the same sort
of vacuum cleaner motor of 30

years ago.
Nothing visibly wrong with stator coils or rotor coils. Resistance
measurements across and between
segments seemed ok. Bit of a noise from the brushes once a revolution, spun
by hand.
Pulled off the spade terminals to unlock and then release the brush
housings. Then spinning the armature with a finger nail against the flow and
gradually increasing the nail angle
a point was reached where one armature segment would catch. Measuring with a
1 to 2 inch micrometer then
the diameter across the commutator was 1.185 inches and 1.192 for the errant
commutator contact strip.
Plenty of life left in the brushes but spark erroded surfaces and broken
leading brush edge.

Why should just one segment be proud? , doesn't seem loose.
Not familiar with this sort of fault. At the moment I am thinking of
spinning in a lathe to bring down this

contact. Point tool or rounded cutter or pointed then round ?
At the moment thinking of grinding back the brushes with a stone about 1.2
inches diameter and then using
commutator bedding stone. Anyone know any better or the pitfalls ? Relieving
the edges of the commutator

strips perhaps with a needle file ?

electronic hints and repair briefs
http://homepages.tcp.co.uk/~diverse

 

[Sam Goldwasser]

Check for a shorted armature winding.

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[NSM]

| I took pity on this m/c dumped and had been rained on, half a pint of
water
....

| contact. Point tool or rounded cutter or pointed then round ?
| At the moment thinking of grinding back the brushes with a stone about 1.2
| inches diameter and then using
| commutator bedding stone. Anyone know any better or the pitfalls ?
Relieving
| the edges of the commutator

Don't use abrasives anywhere near this.

See any good book on motor repair re turning and undercutting.

N

 

[N Cook]

| I took pity on this m/c dumped and had been rained on, half a pint of
water
...

| contact. Point tool or rounded cutter or pointed then round ?
| At the moment thinking of grinding back the brushes with a stone about 1.2
| inches diameter and then using
| commutator bedding stone. Anyone know any better or the pitfalls ?
Relieving
| the edges of the commutator

Don't use abrasives anywhere near this.

See any good book on motor repair re turning and undercutting.

N

I will dig out such a book from the loft.
Inductance measurements on the commutator
are 180mH per diameter and
2.9,1.6,.4,.4,1.6,2.9 mH for 3 contacts either side
of any given contact so no cold shorts anyway.
I don't see what physical mechanism could cause one land to be
7 thou (mil) proud of the others. Also while still in use, why the brushes
weren't ground down to nothing with that sort of irregularity.
Has localised heating caused the copper of that land to somehow permanently
expand by carbon incorporating into the copper ?

 

[NSM]

| I will dig out such a book from the loft.
| Inductance measurements on the commutator
| are 180mH per diameter and
| 2.9,1.6,.4,.4,1.6,2.9 mH for 3 contacts either side
| of any given contact so no cold shorts anyway.
| I don't see what physical mechanism could cause one land to be
| 7 thou (mil) proud of the others. Also while still in use, why the brushes
| weren't ground down to nothing with that sort of irregularity.
| Has localised heating caused the copper of that land to somehow
permanently
| expand by carbon incorporating into the copper ?

The best idea I can come up with was that this was made on a Monday and got
through whatever QC they have, unless it was a factory reject. Disturbing.

N

 

[N Cook]

| I will dig out such a book from the loft.
| Inductance measurements on the commutator
| are 180mH per diameter and
| 2.9,1.6,.4,.4,1.6,2.9 mH for 3 contacts either side
| of any given contact so no cold shorts anyway.
| I don't see what physical mechanism could cause one land to be
| 7 thou (mil) proud of the others. Also while still in use, why the brushes
| weren't ground down to nothing with that sort of irregularity.
| Has localised heating caused the copper of that land to somehow
permanently
| expand by carbon incorporating into the copper ?

The best idea I can come up with was that this was made on a Monday and got
through whatever QC they have, unless it was a factory reject. Disturbing.

N

Centred and turned down the commutator. On checking for
bridges discovered there must be a break in one of the rotor coils.
Must have disturbed it in turning. Traced which coil and it connects
with the errant commutator segment. Found the loop nearest the
unseen break and intend bypassing.

 

[NSM]

| Centred and turned down the commutator. On checking for
| bridges discovered there must be a break in one of the rotor coils.
| Must have disturbed it in turning. Traced which coil and it connects
| with the errant commutator segment.

Somehow that sounds like it's a clue. A good book on AC/DC motors would be
my guide here.

N

 

[N Cook]

I've now repaired the motor. Now a problem
related to use. Not familiar with these upright 'hoovers'
and this one was retrieved from being dumped.
I don't know if its something missing or what.
The only way I can keep the swivel base section with
rotary brush in contact
with the floor is to hook a piece of bungee between the
rotary brush housing section and the mains-cable clip on
the handle base. Should this whole section be pivotting
totally freely so torque with the drive belt keeps the base
in contact with the floor or is some spring mechanism
missing ?

 

[someone]

I've now repaired the motor. Now a problem
related to use. Not familiar with these upright 'hoovers'
and this one was retrieved from being dumped.
I don't know if its something missing or what.
The only way I can keep the swivel base section with
rotary brush in contact
with the floor is to hook a piece of bungee between the
rotary brush housing section and the mains-cable clip on
the handle base. Should this whole section be pivotting
totally freely so torque with the drive belt keeps the base
in contact with the floor or is some spring mechanism
missing ?

I have used this type of vacuum a couple of times.
The brush piece was very solidly attached to the main unit. However, a light
step on the brush unit and it was firmly in position for use.

I have been on the dyson website - no help for your repair there - perhaps
they will send you more info if you inquire?

someone2