Vacuum
 

The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

Vacuum
 

On Sun, 31 Dec 2006 04:01:11 GMT, "Roddy Meatstick.............."
wrote:

The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

Cost, reliability, efficiency? That small vacuum motor is quite
efficient, a compariable induction motor of the same power would be
much larger, then the added cost of a high speed gear box (and its
size)...

Vacuum
 

PeterD wrote:
On Sun, 31 Dec 2006 04:01:11 GMT, "Roddy Meatstick.............."
wrote:

The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

Cost, reliability, efficiency? That small vacuum motor is quite
efficient, a compariable induction motor of the same power would be
much larger, then the added cost of a high speed gear box (and its
size)...

Some would pay the added cost for quietness. But I guess if you have
central vac with the motor in the basement or outside you get the quiet.
Portable quiet would be nice too.

Vacuum
 

It's the weight advantage of using the universal motor.
An induction motor of the same power would weigh 3 times as much plus the
weight of the gearbox.
No one would buy a vacuum that weighed that much.
In central vacuum systems where no one has to carry the motor they do use
induction motors.

"Roddy Meatstick.............." wrote in message
news:bCGlh.1069$925.192@trndny04...
The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

Vacuum
 

On 2006-12-31, Roddy Meatstick.............. wrote:
The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

a vaccum cleaner is supposed to be a portable device.
It'd take 2 guys to carry a 1.2KW induction motor upstairs.

It's much more convenient to install ducted vacuum.

Bye.
Jasen

Vacuum
 

On Sun, 31 Dec 2006 19:06:29 GMT, "Roddy Meatstick.............."
wrote:

PeterD wrote:
On Sun, 31 Dec 2006 04:01:11 GMT, "Roddy Meatstick.............."
wrote:

The vacuum cleaner motor makes just as much noise without the fan
attached to the shaft. It's the cheap motor that makes all the noise. If
they put a geared up induction motor in there it would be a lot quieter.
Why don't they do that?

Cost, reliability, efficiency? That small vacuum motor is quite
efficient, a compariable induction motor of the same power would be
much larger, then the added cost of a high speed gear box (and its
size)...

Some would pay the added cost for quietness. But I guess if you have
central vac with the motor in the basement or outside you get the quiet.
Portable quiet would be nice too.

I recall once being in a store while they were vacuuming the floors.
The machine they had was very quiet (almost silent, really). Down
side? It was HUGE, the size of a 55 gallon drum, with a motor assembly
that was quite large too. Not terribly portable, no way it would go up
or down stairs without two people to move it. But it was quiet. I
later checked how much it would have cost--and it was rather expensive
too, about three times what a good non-commercial vacuum cleaner would
cost.