Thread Number: 63419  /  Tag: Modern Dishwashers
What can you tell me about dishwasher pumps?
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Post# 860013   1/4/2016 at 14:37 (836 days old) by GELaundry4ever (Killeen tx USA)        

Hello everybody. I am curious about dishwasher pumps. I noticed that every dishwasher I have heard sounds different as far as pumps are concerned. What can you tell me about pumps? I am talking about the design, sounds, and how big and powerful they are. Every dishwasher I have heard has a unique sound. For example, the whirlpool point voyager and power clean has a swoosh sound when trying to circulate the water. When it is full of water it has a steady humming. Why do dishwasher pumps sound different? Please Explain.

Post# 860116 , Reply# 1   1/4/2016 at 21:08 (836 days old) by GELaundry4ever (Killeen tx USA)        

Anybody there? Where is everybody?

Post# 860123 , Reply# 2   1/4/2016 at 21:29 (836 days old) by wayupnorth (On a lake between Bangor and Bar Harbor)        
Jerome, have some patience

wayupnorth's profile picture
Not everyone that has the knowledge you want about a specific thing you post is on this site all the time. If someone knows and wants to reply, they will.

Post# 860146 , Reply# 3   1/4/2016 at 23:00 (836 days old) by cfz2882 (Belle Fourche,SD)        

motors used on main pump of dishwashers include:
-split phase:used on most American dishwashers for decades,run at 3450 RPM
-shaded pole:used on late-60s-1990s GE dishwashers and '70s Westinghouse dishwashers-turning at about 3000RPM,these motors are simple but inherently inefficient,requiring oversize cooling fan to keep temp in check-on GE dishwashers with shaded pole motor,a strained sounding magnetic whirring can be heard as motor speed varies some with varying loads on motor as pump sucks a little air at times.
-split capacitor:run at around 3300-3400 RPM and used on a lot of later model dishwashers
-PM synchronus AC:used on sealess "magnetic" pumps,sometimes omnidirectional pump is used,but have seen them with electronic circuitry to make them start same direction every time so directional pump can be used.3600 RPM.
-brushed DC:seen on some late model dishwashers,speeds well over 3600 RPM and variable speed are possible.
-brushless DC wet rotor sealess:my 2010 Bosch dishwasher has this type,driven by electronic circuit,varible speed and RPM over 3600 are possible.Very quiet since there are no external moving parts.
Basicly 3 pump types:
-centrifugal:radial vaned impeller,most common type
-axial:ducted propeller,like a jet ski pump-'60s vertical shaft GE,also found on thermador and some others-usually quite loud :)
-turbine pump:used as drain pump section on some reversing motor pumps,
-mixed flow:horizontal shaft GE including recent models(2010s)

Post# 860186 , Reply# 4   1/5/2016 at 06:20 (836 days old) by GELaundry4ever (Killeen tx USA)        
westinghouse dishwashers

I have yet to hear what the Westinghouse dishwashers sound like. I do love the sound of GE's.

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