On Tuesday, 26 May 2020 18:53:00 UTC+1, Paul wrote:
Jimk wrote:
tabbypurr Wrote in message:
On Monday, 25 May 2020 20:41:18 UTC+1, harry wrote:
On Monday, 25 May 2020 15:41:31 UTC+1, tabby wrote:
On Monday, 25 May 2020 13:15:38 UTC+1, Robin wrote:
On 25/05/2020 11:27, tabbypurr wrote:
On Sunday, 24 May 2020 20:20:33 UTC+1, harry wrote:
On Sunday, 24 May 2020 00:14:03 UTC+1, david wrote:
just bought a second hand belle 130 cement mixer. to find out it rotates so
quick it is dangerous and pretty useless. if i changed the capacitor would it
resolve the issue.
should i change the complete motor.
feel stupid and lost money .....any advise appreciated
There's only one possibility. Someone has fitted the wrong motor.
or the wrong pulleys.
or that it's rotating at the designed speed but that's faster than the
average
or that it has the right motor & right pulleys but that the centrifugal speed regulator is not working. (More likely to apply to historic equipment.)
NT
There is no such thing on an electric cement mixer.
If you can show us the speed determining mechanism on every electric cement mixer ever made I might believe you.
Or you show us just one example....
Do you need an exploded parts diagram ?
http://www.altrad-belle.com/?p=parts&as=240
There's no variable speed drive on the thing.
I don't see a way to adjust it, via some control knob.
The motor is an induction motor, with a starter capacitor
strapped to the side of it (25uF for 230V model). The wiring
is not suggestive of "speed options", as you get on a
central heating ventilation fan (which has four taps for speed).
The electric motor runs at one speed (with "slip" as a
function of loading).
The beauty of the Belle documentation, is figuring out
what you own, and what diagram might pertain to it.
There's apparently a gasoline version (after market?) of that
thing too, as well as the notion of electric drive. And
multiple model years, all hiding under the same SKU, making
picking parts for it, a nuisance.
I could also find an example of a metallic worm gear for that
thing. But there's no sign of that in the diagram above.
The above has two levels of gearing.
Belt #46, wheel #45, cannot see pulley for other end of belt.
Gear #34, ring gear 15 on drum.
Because of the ratios and sizes involved in those, I
don't see home-retrofitting being a viable option. You
probably cannot reduce the tooth count on Gear #34 without
making it non-functional. And wheel #45, it might not fit
if you were to increase its diameter a large amount. It
would end up too big for the housing 4.
You could try looking for an induction motor with
a different pole count. But I don't remember any "bargains"
for motors the last time I looked.
https://www.engineeringtoolbox.com/s...eed-d_649.html
I would try the after-sales support at the manufacturer,
for advice on changing the speed (with a parts change-out).
And only go to the small electric motor shop, as
a last resort. The motor purchased that way, might
well cost as much as the entire cement mixer (depending
on how obscure it was). The pricing doesn't have to make sense.
Sometimes, you can find an electric motor you want,
but the shaft size is wrong, or the shaft is keyed,
or the shaft is the wrong length. Some of these things
can be fixed, but again, at a price.
If you change the shaft speed, the forced air cooling
velocity inside the housing will be reduced. For whatever
that is worth. Motors come with various ventilation
styles.
There isn't that much room for the electric motor in this case.
You couldn't play the market for an "open ended" solution, like
say, a motor with twice the power, but occupying a larger volume.
*******
This isn't the same model, but it shows how complicated
they can make their exploded diagrams. This larger model
has several powering options. The diagram, again, shows
no evidence how the powering options are called out
(from a model numbering perspective).
https://www.magic-parts.co.uk/acatalog/maxi140.gif
Paul
The diagram shows both pulley/belt and ring gear. The ring gear is not going to be practical to increase the ratio of. The pulley I can't see if you can get a smaller one onto the motor, if you can that would slow it some. I don't know what sort of speed reduction results from charging the thing with mix. Baby belle mixers aren't a type I'm familiar with.
In the end, if it's capable of turning at all with mix in, then it can be slowed by other simple means, but I'd definitely start by
a) checking speed when fully loaded
b) gearing it down with a small motor pulley as far as possible.
Once those are done, a pulsing driver or VFD would slow it further. But it would also reduce the motor's cooling fan speed, and that would need a workaround, ie a separate small high speed fan. A slower motor is the other option.
I'm a bit more familiar with much older mixers, but not a lot.
NT