I have a milwaukee 2771-20, tried obtaining suitable datasheets, might have to wait till tomorrow to see if i can get a response back from the manufacturer, but have found that sometimes i might want to use the thing in applications with the impeller pushing out less than 8 gpm. I’m thinking if i wait to see what datasheets i can obtain or whatever i can get from manufacturer by tomorrow, i will consider ripping it apart to figure out a strategy to introduce some speed control into the device.
I could obstruct flow but i suspect that is neither efficient and induces wear and tear on the equipment.
I could switch it on and off really fast by ising a triac or relay (thinking this will induce wear and tear).
Or i could have a varister i can adjust and use esc, depending on what i get to see of the guts inside of the device…
Or perhaps there is a functional motor speed controller already in there and some very simple tweaks it could pump at 1 gpm instead?
Think i’ll have better information tomorrow but seems you might have a part that i need to buy (probably a few).
I can come by in 24 hours if this is too little information, because if i get nothing from the manufacturer i will snap pics of the motor and info printed on it, and the board inside.
It looks like a really closed unit meant to be watertight (operating in wet conditions), so hacking it might expose the electronics and create quite a few additional issues for you. In terms of complexity, if there’s just an on/off switch, the unit is likely made up of the battery -> switch -> motor (and perhaps a relay thrown in). You could add an analog DC motor controller between the battery and the motor and use a potentiometer to control the speed, but given that there’s likely almost no room inside the unit, you’d have to create a watertight external case. You’d need to know the current draw of the motor before selecting a DC motor controller (you could even use a multimeter to measure it), then a potentiometer (waterproof) and waterproof wiring.
Here’s a photo of the guts. I’m going to take a closeup of the board next, as well as dig into the motor unit to see what is in there.https://s22.postimg.cc/o2uiqi99t/15331482658982130576387.jpg
Here is the motor specs:
They have datasheets for lots of models, but not that specific one, so i have emailed the manufacturer and have requested a datasheet for it with the image enclosed.
Hopefully that works.
Leshi motor should be able to give you the details about the current.
There are quite a few electronic components in there - aside from the on/off, what other functionality does the unit have?
