Thread Number: 35415
3-phase inverter drives (efficiency)
[Down to Last]

automaticwasher.org's exclusive eBay Watch:
scroll >>> for more items --- [As an eBay Partner, eBay may compensate automaticwasher.org if you make a purchase using any link to eBay on this page]
Post# 528884   7/5/2011 at 17:08 (4,758 days old) by arbilab (Ft Worth TX (Ridglea))        

arbilab's profile picture
Ad copy seldom goes into technical details beyond giving a feature an exotic marketing name meaning nothing substantive. But is anyone usine 3-phase inverter drive in home laundry machinery?

5 years ago I 'invented' 3-ph I-drive for efficiency and modulation in residential refrigeration. Not knowing it was already invented and in limited use, just that 3-ph motors are much more efficient than single phase. My AC guy told me they were notoriously unreliable, that the electronics are lucky to last a season. Well yeah, it's a rough environment. I had already addressed that, mounting the power parts on a ceramic return-gas manifold, around 50F non-conductive infinite heatsink but still has to be isolated from atmosphere to prevent condensation. (Thought of everything.)

But even if it hadn't already been invented, I didn't have the $1/2M to patent and develop it, so it was just an exercise in imagination. For myself, I'm not sure the reliability shortfall would be worth the electric savings in home laundry. Enough problems with electronic washer modules as it is, the savings is dimes, the replacement module is hundreds.





Post# 528888 , Reply# 1   7/5/2011 at 17:25 (4,758 days old) by DADoES (TX, U.S. of A.)        

dadoes's profile picture

 

My washer, dryer, and dishwasher have 3-phase motors.

 

My parents' house has 3-phase air conditioning.


Post# 528936 , Reply# 2   7/6/2011 at 00:19 (4,758 days old) by arbilab (Ft Worth TX (Ridglea))        

arbilab's profile picture
3ph dishwasher? That's over the top. But the more practice they get doing it, the better it gets.

My FL is DC tach controlled. From 1998, before the 3ph chipset was invented. I'm not nervous about the electronics. Shoot, the motor never even gets feelably warm, so how much power could it possibly be wasting? (Yes, I take the panel off and feel the motor after it's run. I'm funny like that.)

I've only lived in one house in my life (1957) with 3-ph supply. It only ran the central air. When it comes to inverters, the GREATLY added parts count can easily outweigh the electric savings. Specially in the days of cut reliability corners. As above, one module replacement wipes out years of savings.


Post# 528947 , Reply# 3   7/6/2011 at 01:08 (4,758 days old) by dj-gabriele ()        

The refrigerator at my parents is inverter based, a Candy of some sorts, I still didn't see it in person. It's very energy efficient and cost only a little more than a standard fridge.

Also our A/C is inverter based but this time it is all D/C current based, also the internal units as this way it's more efficient than an A/C based inverter machine.

Anyway, if inverter based 3-phase machinery were less reliable than mono phase/DC motors, then 90% of all industrial stuff would continuously be out of order!


Post# 528952 , Reply# 4   7/6/2011 at 02:16 (4,758 days old) by arbilab (Ft Worth TX (Ridglea))        

arbilab's profile picture
DJ, industrial stuff has real 3-ph to start with. A 3-ph motor is nothing more than 3 copper windings. Not even a capacitor or start switch to go wrong.

It's when you make 3-ph out of singlephase that the parts count goes up and the reliability goes down when it's done in today's cutcorner manufacturing environment.

Also, a DC motor happens to be 3-ph, mechanically commutated. Unfortunately, mechanical commutation is not practical within a sealed refrigeration system. It is within a laundry system, I haven't had a problem with mine for 13 years.



Forum Index:       Other Forums:                      



Comes to the Rescue!

The Discuss-o-Mat has stopped, buzzer is sounding!!!
If you would like to reply to this thread please log-in...

Discuss-O-MAT Log-In



New Members
Click Here To Sign Up.



                     


automaticwasher.org home
Discuss-o-Mat Forums
Vintage Brochures, Service and Owners Manuals
Fun Vintage Washer Ephemera
See It Wash!
Video Downloads
Audio Downloads
Picture of the Day
Patent of the Day
Photos of our Collections
The Old Aberdeen Farm
Vintage Service Manuals
Vintage washer/dryer/dishwasher to sell?
Technical/service questions?
Looking for Parts?
Website related questions?
Digital Millennium Copyright Act Policy
Our Privacy Policy