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#1
Posted to alt.electronics
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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? |
#2
Posted to alt.electronics
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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)... |
#3
Posted to alt.electronics
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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. |
#4
Posted to alt.electronics
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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? |
#5
Posted to alt.electronics
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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 |
#6
Posted to alt.electronics
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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. |
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