Electronics > Projects, Designs, and Technical Stuff
Convert blower motor for ductless ops
amyk:
--- Quote from: james_s on May 21, 2019, 04:36:23 pm ---Older turbochargers lack a compressor bypass valve. The one in my '84 Volvo is like this and you can hear the odd pulsing flutter if you suddenly close the throttle while under high boost. Adding a bypass valve is something I've been meaning to do for years.
--- End quote ---
This sound?
Apparently it's very desirable in parts of Australia... :-//
james_s:
Yeah more or less, it sounds vaguely like a turkey and it makes me cringe whenever it happens because I picture the shockwaves slamming into the compressor blades.
zz28zz:
Update: Spent some time this evening experimenting with different airflow blockage configurations.
The blower has the motor mounted to one side so fabricating blockage panels wasn't attempted on that side.
Tried different amounts of blockage on the other side ranging from abt 30% to 100% blockage. Amp draw didn't drop very much, even at 100% blockage (one side only). As I approached 100% blockage, I could feel blower wheel vibration increasing. Aborted any further attempts at blocking inlet.
Used alum strips 1.75" wide across the outlet for blockers. Moving them around while watching ammeter. Ultimately the best combination of airflow VS amperage wound up being a little over 60% blockage using 3 of the alum strips. One placed across the top, bottom and middle of outlet. This dropped the current to 6.5 amps (vs 10+ Amps unblocked). Air distribution pattern is better with this config as opposed to having blockers all at top or bottom of outlet. Ran it for abt 1 hr and checked motor/wire temps. Everything felt cool. Next step is to run it for ~1 week continuously sitting in the middle of a concrete floor to make sure it will be OK if left on overnight suspended above the boat.
Numbers below:
Outlet Height= 8.5"
Outlet Width= 10.75"
Blocker strip width = 1.75"
# of blockers= 3
Total outlet area= 91.375 sq"
Single blocker area= 18.81 sq"
Total blocker area (3 blockers)= 56.43 sq"
% of blockage= ~61%
james_s:
It's probably not necessary to run it for a week, I suspect you'll find that within an hour the temperature of the motor will have reached equilibrium and won't really change much. If it has a rated amperage anywhere you could go by that, or calculate it out from the horsepower rating, IIRC motors like that are usually around 80% efficient.
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