Vacuum

[Roddy Meatstick..............]

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?

 

[PeterD]

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)...

 

[Roddy Meatstick..............]

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.

 

[Jack]

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.

 

[jasen]

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

 

[PeterD]

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.