I want to slow down a electric motor on a dishwasher timer.

Motor is 115v 3w ac . With low water pressure the timer shuts off before enough water enters to wash well. Their is an over fill safety so I don't need to worry about that. I realize that this will also increase all function times but that is ok. Thank you.

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bngeohealth (author) 5 years ago
Thank you for your answers. My electronics are not great but I can follow instructions. I looked at frequency generators but could not find plans for such a small motor. The water pressure in the house is consistent throught so some times the washer works fine but we are not always aware of when thier is a pressure drop unless we use the water. Took a while to figure out because the problem was intermintent . A booster pump ? Maby but seems elaborate. Now looking to modify cams on the drum to hold the contacts closed longer. This may be easier than a frequency modulater unless a 55hz modulater for a 3w motor is easier?
ANOTHER way to do it, would be to put a stepper motor on the timer....The body style of the motors used is the same between an AC motor and a stepper - in fact, you can use a stepper directly (the correct) AC volts. Then the signal generator need only be very, very basic to get what you need.

Steve
Its not an easy thing to change the speed of. The BEST way is to drive the timer on its own from a different frequency supply - like say, 55Hz, instead of 60Hz.

You can't run these motors at a different voltage and get a change in speed - well, you can, a little bit, but you lose power from the output too, and it will stall (and burn)

Making a thing to give you an adjustable frequency though, at mains volts, isn't easy. How's your electronics ?

Steve
+1
Perhaps consider adding a booster pump in parallel with the 'input water' solenoid; boosting the pressure might get you a little more water in there.

Also consider the lines /valve might be crudded up and a simple descaling might be in order to get that flowrate back up.
Pumping though implies there's stuff to pump: the OP needs to check the water at their incoming pipe I suppose.

Steve
true, but the flowrate of an open dishwasher valve still isn't very high at all. Agreed on checking pressure for the rest of the (presumably) house.