Hi. Im building a project that involves a DIY vacuum essentially and I was wondering if anyone knew of a place selling fan/blower blades that would fit the dc motor I have. I bought this off Amazon:
URBEST DC 12V 6000RPM Mini Magnetic Motor for Smart Cars DIY Toys
I was planning to use that to create the suction. Anyone have experience with that or a similar motor? Im wondering if it is powerful enough. I don't need the suction to be super strong.
Also, this will be the first time I'd be powering my uno with the barrel adapter so I was wondering: when powering the motor do I pull the 12v from the vcc on the board, or what is the correct and simplest method for hooking up the 2 connections on the motor? I don't need reverse on the motor, just on and off. I did buy some controllers but I'm trying to keep it as simple as possible for now. Any help appreciated, thanks all.
Some places don't like links so I opted not to post it originally. Thanks for the reply. I'll try that route. I looked around a bit and couldn't find anything so I came here.
You should be easily able to get a fan for a motor with a 2.3mm shaft.
Whether it can shift much air is another matter. I think the guys using fan-jets for flying use more powerful motors or else drive them with a much higher voltage - but that will shorten the life of the motor.
My guess is that you need a motor designed for a much higher RPM.
You do not say which Arduino that you are using so I will assume that it is a 5V Arduino. Read the how to use the forum-please read sticky to see what sort of information that you need to provide so that we can offer intelligent help.
The simplest motor driver for a DC brushed motor that turns in one direction is a N channel logic level MOSFET (with flyback diode). A 12V power supply would connect to the motor through the MOSFET. Use a 12V to 5V buck converter to drop the 12V to 5V for powering the Arduino through the 5V input. Powering the Arduino through the power jack or Vin has problems. The 5V regulator on an Arduino can supply limited current. With 12V into the regulator you can not draw more than about 80mA from the regulator before it gets hot and shuts down.
To pick a MOSFET you will need to know the stall (starting) current of the motor.
There are loads of 12V fans available with motors already fitted, usually more modern brushless motors. Why not use one of them?
But if you really want to use that 380 motor possibly your best bet would be to use a propeller rather than look for a specific fan. A propeller in a duct will move a considerable amount of air.
Oh, I'm using an uno I think it's called an r3. The buck connector I think is what I was missing from my mental picture. I have MOSFETs :
Not sure what to think about that motor though, I can't find any current rating on the item page.
Slipstick, I like your idea, I guess I have been looking in all the wrong places for what i need. That would basically solve my problem if it included the fan or propeller already. I am planning to use it in a duct to create the suction.
Thanks for all the help everyone! It is really appreciated.
Those transistors I linked aren't MOSFETs apparently.
They are NPN bipolar transistors. Good for around 600mA.
They seem like they could still work though?
They could, maybe, but you need to know the starting current for the motor before choosing a transistor, bipolar or MOSFET. If you cannot find a specification you can estimate the starting current by measuring the resistance of the motor windings and calculating the current. Measure several times, rotating the motor a bit between measurements. Make sure to zero the test leads before you start. Take the lowest reading for the calculation.
Starting current is: motor voltage / (lowest) measured resistance.
Note the diode across the motor in the schematic above. That is a flyback diode to shunt the high reverse voltage that happens when the motor turns off. Without the diode the transistor (bipolar or MOSFET) will be damaged. The cap is optional.
