Hey guys. I've noticed that more and more dishwasher main wash pumps are getting quieter and quieter. Why is that? Did they eliminate cooling fans? Why or why not? I've noticed that even the new Maytag dishwashers eliminated the cooling fan noise since you can't hear it. I believe GE may have a very small one. What are your thoughts?
main wash pump on dishwashers
- Thread starter gelaundry4ever
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GE dishwasher wash pump
Do GE dishwasher pumps still have a cooling fan?
Do GE dishwasher pumps still have a cooling fan?
cfz2882
Well-known member
motor fan
no separate fan-just fins cast into the aluminum rotor end rings of the motor to circulate cooling air.My Bosch dishwasher has wet rotor BLDC motor with no external moving parts.A craptastic 2019 Frigidaire dishwasher I junked had a little brushed dc motor with a small radial fan on the end.
no separate fan-just fins cast into the aluminum rotor end rings of the motor to circulate cooling air.My Bosch dishwasher has wet rotor BLDC motor with no external moving parts.A craptastic 2019 Frigidaire dishwasher I junked had a little brushed dc motor with a small radial fan on the end.
rinso
Well-known member
I have a 2018 TOL Whirlpool-made KitchenAid dishwasher. Its drying performance totally sucks. It has an asthmatic blower fan, but if one opens the machine at exactly the time when the cycle is complete, steam pours out of it and even glasses and plates still have water droplets on them. And yes, I do use a rinse aid. Other owners have complained of the same thing.
to cfz2882
Which dishwashers have pumps that still use them? So far, I'm starting to hear less cooling fan noise on the dishwashers of today. I am referring to the ones with the fins cast into the motor rotor.
Which dishwashers have pumps that still use them? So far, I'm starting to hear less cooling fan noise on the dishwashers of today. I am referring to the ones with the fins cast into the motor rotor.
cfz2882
Well-known member
I do not know much about modern dishwashers,but I think there no longer are any with a vertical shaft split-phase motor like was the norm in the '90s and before. For fan noise emitted from motors,items near the fan such as windings and bearing housing support struts/ribs can effect the sound as the fan blades/fins chop through turbulence in moving air caused by the struts.The no-fan BLDC motor in my 2010 Bosch has a faint whizzing sound.
whirlpool dishwasher
The previous whirlpool dishwasher I had used a fan in the back of the motor which had a steady hum. It was the point voyager design.
The previous whirlpool dishwasher I had used a fan in the back of the motor which had a steady hum. It was the point voyager design.
maytaga806
Well-known member
I’ve been wondering the same thing. How is it possible to make them so incredibly quiet? Our 2019 Maytag is very quiet, but it does sound like it has a fan on it when the lower floor panel is off. Infact the fan is louder than the motor itself. Talking about the point voyager updated wash system that was exclusive to all Maytag models for 2015-2019 which washed all racks at once and did not have an alternating system. Same with other manufacturers, very quiet motors. How do they reduce the noise so much? It’s incredible work however I thought the original Point Voyager whirlpools were a perfect decibel, not too loud but not so quiet to where you can’t hear what it’s up to and where it is in the cycle. It’s always fascinated me over the years and Bosch was truly one of the first ahead of the game for quieter dishwashers, then everyone followed the trend in the late 2000s.
to maytaga806
Believe me, I've been intrigued by it as well. My GE/Kenmore dishwasher had a cooling fan you could hear while running. To me, it made the dishwasher sound cool. It's interesting.
Believe me, I've been intrigued by it as well. My GE/Kenmore dishwasher had a cooling fan you could hear while running. To me, it made the dishwasher sound cool. It's interesting.
Efficiency is the answer
An inefficient motor produces a lot of waste heat, the motor needs a fan to remove the accumulating heat.
More recent motor technologies use less power for the same output, this means less waste heat is generated.
Thus a simple aluminium heat sink may be enough to cool the motor, no need for a fan.
Also, manufacturers are aware that being quiet is a desirable feature in a dishwasher, especially in open plan homes with living areas open to the kitchen. So they are engineering in quiet design as well as adding more sound insulation. Fans = noise.
An inefficient motor produces a lot of waste heat, the motor needs a fan to remove the accumulating heat.
More recent motor technologies use less power for the same output, this means less waste heat is generated.
Thus a simple aluminium heat sink may be enough to cool the motor, no need for a fan.
Also, manufacturers are aware that being quiet is a desirable feature in a dishwasher, especially in open plan homes with living areas open to the kitchen. So they are engineering in quiet design as well as adding more sound insulation. Fans = noise.
GE's new dishwasher pumps
I've could've sworn I've heard a cooling fan from the main wash pump on GE dishwashers.
I've could've sworn I've heard a cooling fan from the main wash pump on GE dishwashers.
pump layout
Does anybody make dishwasher pumps that are vertical or horizontal? What about Bosch? It seems to me that most are horizontal. Do they still make vertical pumps anymore?
Does anybody make dishwasher pumps that are vertical or horizontal? What about Bosch? It seems to me that most are horizontal. Do they still make vertical pumps anymore?
vacerator
Well-known member
don't think
any have integral pump/drain motors anymore. Some were side mount. The motors are all smaller, and seperate, thus quieter, not always more durable. They don't mount to the tub, but have rubber plenums, so it doesn't matter which direction they face.
any have integral pump/drain motors anymore. Some were side mount. The motors are all smaller, and seperate, thus quieter, not always more durable. They don't mount to the tub, but have rubber plenums, so it doesn't matter which direction they face.
bldc pumps
My Kenmore built by Bosch has a bldc pump. I notice it would alternate spray pressure from low to high and back depending on what cycle it was on. I think the normal cycle does high pressure because I've heard it do that before.
My Kenmore built by Bosch has a bldc pump. I notice it would alternate spray pressure from low to high and back depending on what cycle it was on. I think the normal cycle does high pressure because I've heard it do that before.
kenmore/bosch
Also, this dishwasher pump doesn't have a fan unlike the older models I've encountered.
Also, this dishwasher pump doesn't have a fan unlike the older models I've encountered.
