ransley wrote:
On Dec 21, 1:46 pm, "HeyBub" wrote:
terry wrote:
On Dec 21, 5:09 pm, Some Guy wrote:
Just wondering if anyone has replaced their conventional furnace /
HVAC fan motor (PSC, single phase, etc) with one of the new ECM
motors to realize a reduction in your electricity bill.

Does anyone know what the "over-the-counter" cost is of these
motors?

Also, do ECM motors generate electrical or RF noise that is either
radiated by the motor or fed back into the household wiring,
thereby messing up AM radio reception?

What is an ECM motor?
Just a few thoughts.
Most conventional induction motors don't get that warm, so how much
electricity are they wasting?
Also; let's say that it is a 200 watt (quarter horsepower motor?)
and you can 'save' one quarter of that consumption.
Also the motor runs half the time?
So saving = 0.05 kilowatts x 24/2 = 0.6 kilowatt hours per day.
At 10 cents per k.watt.hr that = 6 cents per day. Roughly $25 per
year?
Versus cost of new motor?
On other hand that 'wasted' electricity is dissipated within the
house as heat so the furnace would have to run a few more minutes,
burning a little more oil/gas each time to compensate?

But the motor is outside the conditioned-air area, so it won't
affect the heating/cooling.

Assuming the motor costs $200, according to your calculations you
would break even in only eight years.

However, there is the opportunity cost to consider. $200 in a savings
account instead of a new motor, at 6% interest, generates $12 per
year, making the savings only $13. At that rate, the break-even
point occurs in fifteen years.

Then there's the labor to install the motor, increased taxes, and
other variables.- Hide quoted text -

- Show quoted text -

Where can you get a 600$ vsdc motor for 200?

Arghh! I read 200 watts as 200 dollars. Sorry.

Multiply all my calculations by three (45 years to recover the expense). As
for your actual question, I guess I could get a $600 motor for $200 from
someone who was silly enough to attempt this project.