It says 17W, DC24V 980RPM - it has Vnm PWM & GND lines
My research seems to suggest that the voltage limits a lot of standard control options/shields. And being brushless also excludes a lot too. The L298N for example probably wouldnt be appropriate.
Any suggestions for the best type of shield to drive this?
In general using harvested things calls for quite some knowledge. If You want to run a museum it might be worth the effort.
I'm not a brushless guy..... Study the principles of running brushless motors. Then take on the difference regarding voltage. Can another driver run You motor by some intermediate stuff?
I'd be reluctant to use a different motor. It's harvested from a fairly new air purifier that had the control unit die. I am actually harvesting a good part of the fan assembly too which all fit together perfectly and using that to create a new temperature regulated filtration system for an enclosure - this motor in particular runs whisper quiet, so im keen to keep it.
Brushless is a beast and a little intimidating and while I am familiar with the principals of it, control implantation and design/knowledge of appropriate pre fab components is where I could use some help with. Hoping there is someone who is great with brushless motors on here! Cheers Railroader.
Okey. Sorry I wrote "old ....".
Is there any way You can get information from the manufacturer or others, selling this kind of equipment? No spare parts available for Your equipment?
That would be more of plug and play instead of special design.
Driving a brushless motor is a complicated task. This motor in particular does not have a shaft position sensor which makes it more difficult.
So you need to either harvest the controller from you purifier or find a brushless controller on the internet. These controllers are often called "ESC"
Cheers, appreciate the help here.
Do you mean something like this?
Is the idea that you then take the potentiometer out, and replace that with a signal and common ground from the Arduino inserting some PWM?
My next question would be, the motor specifies its 3 lines in are Vm PWM GND, the ETCs talk about phase line outputs as U V & W - which is basically firing the sets of poles coming in from MOSFET bridge driver.
Why would this motor instead provide Vm, PWM and Gnd - Do some brushless motors come with their own control? I can see it has a board of circuitry inside.
Hi,
Can you please tell us the exact part number in the side of the motor.
The motor has a wiring diagram on the side, can you send a picture of it please.
It says it is a synchronous motor, so it may be AC with a phase capacitor to give the other phase for direction.
They give it an AC Rating of 50/60Hz yet say its DC.
I doubt if the description is "accurate", its from China!!!!
If that's accurate, then the "fancy" electronics that everyone is talking about are already built into the motor, and you can probably control is just fine by feeding 24V in on the Vnm line, Gnd on the Gnd line, and "Open Collector" PWM on the PWM wire. (although the eBay description mentions a resistor between the Vnm and PWM wires, so you wouldn't want to connect it directly to an Arduino PWM pin.)
"Brushless motor" is a pretty ambiguous term, especially since it has become marketing-speak for "fancy." In the RC Hobby arena, what it usually means is a 3phase motor where you need a motor controller to provide a carefully time waveform to each phase of the winding. This is what most of the people replying are talking about.
But most AC motors ("Induction motors") are technically brushless, as are stepper motors. The fans in your computer are "brushless" and have internal electronics that drive them when you simply apply DC. Fancier computer fans have an additional PWM input to change their speed, but they still only need DC on the power wires. Even fancier fans add a 4th wire that indicates the actual speed of the fan, so that (mostly) the software can tell if it's jammed or broken.
What you have, based on the description and the application, is probably essentially a somewhat up-sized version of one of these computer fans, and it probably wants 24V power and a PWM signal (the big question is "what does the PWM signal look like." It should run with nothing connected to the PWM, if in fact this is this type of motor.)
New stock 24V DC brushless fan motor, inner rotor brushless motor, front and rear ball bearings, good quality.
This motor has a rated voltage of 24V, a rated power of 17W, and a rated load speed of 980 revolutions. In actual tests, it can operate at 5-24V. The motor supports PWM signal speed regulation. The motor starts slowly and has little impact. The motor rotates clockwise.
If the motor steering needs to be replaced, the position of the three-phase line inside the motor can be changed.
A 10K resistor is connected in series between the yellow wire and the red wire to the positive pole of the power supply,
When the black wire is connected to the negative pole, the motor runs at the highest speed.
The motor test speed and no-load current are as follows. The nominal load speed with rated power is 980 rpm. However, the no-load test speed is very high, so the speed is also very high under light load. The test parameters are for reference only.
The maximum no-load speed under 5V voltage is 600rpm, and the no-load current is 0.28A.
The maximum no-load speed of 12V voltage is 2600 rpm, and the no-load current is 0.5A.
The maximum no-load speed is 6500 rpm under 24V voltage, and the no-load current is 0.6A.
That is from the Ebay site.
Have you got a power suppy to connect the motor too?
That looks like a fine controller supporting my hypothesis. It doesn’t have the complexity to be driving a 3phase motor, but just about right for generating and level converting a 5v PWM signal to whatever the motor needs. Using the dials and switches, which is not what you want if you need to control it from an arduino.
So I did a test with 24v to the Positive and ground, 5v to the pwm line from a separate source connected to common ground with a 10k resistor in there too and we have lift off!
So just figuring out the characteristics of the PWM line and then will interface with the arduino on the weekend. Thanks for your help so far and will keep you posted!
Thanks for your help so far and will keep you posted!