Dish washer Pump Motor - strange to me - how to run it?

Thread Starter

Tonyr1084

Joined Sep 24, 2015
4,375
This dish washer motor runs on 120 V 60Hz at 1.7A (you can read the rest from the sort of blurry picture)
It has two wires that appear to bring power in (120VAC) and three smaller wires that must control speed.
I'd like to set it up to run a fountain sometime in the future. But to use it - I can't just throw 120 VAC on it. Something controls speed. The shaft rotates like a stepper motor with 18 definite stop positions.

Any help?

VSM - U2 306466
Electronically Protected
BLDC checked
04.03.2011 - - - - - 06:48

AWECO 305792 VSM-U2-xx E302296
730.50003.02 S 063.11 III. 2349 444
120V 60 Hz 1.7A 95W C1. F
For use with max. 75'C Water
Max. surr. air 60'C HW01 SW7.06
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Externet

Joined Nov 29, 2005
1,469
Hi.
Washers, dryers, ranges, refrigs... have the schematic tucked in. Check if the donor dishwasher has such, it may help.
The 3 'unknown' terminals go to tiny resistors; shoud not be for power but some sensing. You will likely need to use the electronics board.
Have you tried a variac or 24VAC or a series 120V light bulb using the 2 terminals ?
What works on 120VAC may be the assembly, not the motor alone.
 
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Thread Starter

Tonyr1084

Joined Sep 24, 2015
4,375
There are nine coils and three terminals for connection. The terminals are in the fourth picture up at the top left side. I'm assuming nine coils divided by three terminals gives three circuits. Which coils are energized and which are not and how fast they switch controls the speed - I assume. I know how to spell assume, and how to make an ass out of you and me. Happened when I asked why my neon lamp continued to glow minutes after unplugging it. The answer to that one was that it wasn't a normal neon lamp but one with a phosphorus coating that was glowing while still warm. So there are no assurances with what I have. Resistors between the three leads??? Dubious about that. And the schematic is long gone. Perhaps I can find it on Google, haven't tried that yet. But tomorrow is the next day.
 

MaxHeadRoom

Joined Jul 18, 2013
20,426
So it does say BLDC on the label, so I guess we can assume that is how it is commutated.
Connected 3ph stator windings.
Hence the on board electronics.
ECM (Electronically Commutated Motor) commonly found in a few home appliances now.
Max.
 

Thread Starter

Tonyr1084

Joined Sep 24, 2015
4,375
So, @MaxHeadRoom those three smaller wires - would you say they're controlled by a low voltage? Assume the three wires are labeled A, B and C. And I'm just guessing here - would I put 5 volts on lines A and B ( + & - ), then B and C, then C and A, then B and A ( - & + ) then C and B and finally A and C?

TBH - I don't know at all how this would be controlled.
 

MaxHeadRoom

Joined Jul 18, 2013
20,426
I know nothing about your particular motor, but ECM motors such as this are typically 3 phase powered, they can also have another three LV sense connections in order to detect rotor position for commutation purposes.
Another method without sensor, is to oscillate the rotor slightly at first and detect the position, from then on the commutation is done in the controller.
Max.
 
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