What type of motor do these use?

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Chetlaham

Chetlaham

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Do these use an induction, synchronous, inverter or DC motor? I can't figure it out, but I am going to be honest with everyone here. After the "cake" thread I am starting to get this urge to play with one of these:

http://www.homedepot.com/p/Whirlpoo...th-the-1-Hour-Wash-Cycle-WDF120PAFS/300050125

I figure now that the technology was had several years to mature and that many engineering changes and models latter have produced a bug free product.

Here is the motor that the internet gives:

https://www.repairclinic.com/PartDe...?modelNumber=WDF120PAFS0&ss=a9b5d2149871&mr=1

Also, does anyone know of the wash and rinse temperature on Heavy + High temp?
 
Boards on motors

True inverters usually require some form of advanced cooling, usually a heat sink. AC to DC rectifiers do not, however they need some form of switching or the good old brushed commutator system, which is way chunkiert than that pump. So yeah, some for of induction or more likely a synchronus motor (wich basicly is what most drain pumps are).
 
looks like a synchronous motor with bi-directional pump.I saw one synchronous dishwasher main pump,~1998 vintage,that had a circuit board built in to make the motor run the same direction every time-allowing a more efficient directional pump to be used.
 
A better make

Is there a better make in terms of cleanability? My understanding is that they all use the same mechanism. I can live without rinse-aid. My rinse-aid dispenser at home is still empty lol, never been filled.
 
@cfz2882: Never new such a motor existed having a board to force only one direction. Anyone know if this motor is such? Better yet, Combo, do you have any replaced (to be scraped) motors lying around? I'm really curious how these new DW work.
 
Main Motors in WP Built DWs Since 2000

WP has used more than a 1/2 dozen different main motors and another 1/2 dozen different drain pumps as well in their DWs in the last 17 years or so.

 

WP has generally built the best cleaning, best drying DWs over the last 50 years or more, and by far about the most easy to repair 99% of the time without having to remove the machine from its installed position.

 

Hi Chet, yes we have lots of motors lying around that fit these newer DWs, if you are ever interested you are very welcome to visit and go through them and even take some home. The motors WP is using seem to be quite reliable and we have little demand for them as used motors so a lot of them just go in the recycling bin unlike the crappy brush type motors that FD have used for the last decade + and now GE seems to be using these low durability in their newer DWs as well.

 

John L.
 
Thanks Combo, that means a lot to me :) You are very generous. I might order one or two just to take apart- will see.

I do agree with you about repair. It seems that the most easy to repair by far of any machine be it dryer, washer, DW or range is hands down WP. Their newer vertical modular washer is by far the easiest thing to fix- easier then small appliances and computers if you ask me. Light weight and few sharp edges to.

If WP is using synchronous motors then I think we have a winner. A brush motor does not belong in a DW IMHO. And for the price a BOL whirlpool is giving you 3x more in all categories including longevity.

Drying- this is a biggy for me. I do not use rinse agent, so I rely entirely on what the machine can do. I've had Whirlpool machines that dried very well with and those that needed towels at the end of the dry cycle. If I was to buy a Whirlpool made machine, which would you recommend from drying aspect?
 
I wouldn't think Whirlpool would be using a Synchronous motor in a dishwasher--Synchronous motors I know of are PRECISION "instruments" for maintaining a precise speed-synchronized to the frequency of the power line feeding it.Thus such a motor is VERY expensive in that size-more likely its an induction motor.The permanent magnet synchronous motor made the small ones possible-but still expensive-found them in record turntables,Hammond organ tone wheel drives,tape recorder capstan drives.The largest one I encountered was for the capstan drive in an Ampex Quad VTR.The motor was driven by a tubed or solid state power amplifier driven by the TV station sync generator.In physical size it is as big as a washer or dishwasher motor.The amp that drove it put out like 700W!
 
Synchronous motors are not necessarily expensive. An induction motor running directly from the mains behaves pretty much like a synchronus motor. If you want to speed controll a synchronus motor, you'd need to modify the frequency of your supply, which would require a inverter, which makes it more expensive.

A synchronus motor has permanent magnets on the rotor, the rotation speed is affected by the frequency of the supply. So it's just windings, the alternation of the field is done by mains frequency. Or, for variable speed applications, an inverter alternates the frequency of the incomming supply to match the speed desired.

An induction motor uses inductive effects to create a current in the rotor windings to create the rotors magnetic field. Thus, just like a synchronus motor, it has a synhronus speed.
 

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