Don't know why you only have three comments because you make really good videos with truthful information. Congrats from me if no one tell you. You deserve it, I lean and figure things with the use of your truthful information. Thanks 👍👍👍✌
You’re getting more and more wanting to take my old DVD player and microwave apart and making something that will teleport me back 12 years to the time before I had kids! 😂! Love your videos, if only my science/physics/engineering teachers were as good as you! 👍🏻
Nice video! Back in the mists of time (it really was a long time ago) we were taught "Star" and "Delta"! If you reverse any 2 of the 3 phase wires you reverse the direction of the motor (handy if you need a reverse switch) If you go big scale you get a Star Delta transformer in your substation. The HV in pylons is Delta and the 240/425v supply is star with your neutral off the center .... and the earth too!
What a great description of 3 phase / brushless motors / generators Robert. Before this video it was an art shrouded in mystery, now its as easy as walking. Cheers!
I recently deconstructed an old office photocopier - several of those round brushless motors, some steppers, lots of gear wheels and belts, really nice axles / rods from 6mm to 8mm, loads of lovely bits. So this video was very helpful, thanks.
@9:26 to 9:50, I assume you twisted all the silver together as you did with all the black, which then became the red wire, but thought I'd mention it here for others as that step was missed. Very helpful information for those of us either just getting started with motors in electronics, or for those of us who have been away from it for FAR too many years!!! 😄 (I honestly can't believe how much is possible for a person to completely forget and have to relearn over the course of 30 years of disuse.)
I'm sorry that's not enough you deserve more. I've been designing and boat for some years now and one part I've been kind of stuck on is deciding how to bring air conditioning to the boat. You have given me ideas to help me decide. This is my issue of having many skill sets is deciding what's best or can I life without a system. On boats it's best thing's work together like heat and cooling in one unit. But also on boats redundancy is king as it could be the difference between life and death. So balance rank suppream. Building a boat like the one I want to build requires much thought as some things can't be changed once done or start over. Stating over will cost much more time and money. So hopefully you can see how your videos are inspiring many people in ways on matter what their trying to do big or small.
Thanks again Robert, I’ve been watching since you started uploading. I’ve had my 10yo watching as well, and this goes a long way since she is still out of school.
Thank you so much for your very clear explanations of these motors. I never thought of them as delta and y circuits. That opens up a whole lot of the matter, but am I right: if you take any two motor leads and reverse them you change the direction of the motor? Thanks so much, I have quite a few of these.
Great guide, thank you. It's worth noting that the printers that you take these from will probably have a motor controller built in and the stuff that you ripped off can be really useful if you need to sense the motor position. I was building a wind turbine but i wasnt happy with the particular motor, with a different 3d print and a bit of experimentation, I had the start of a weather station and a great wind direction sensor!
In Dr Bass videos he shows a ebike setup with big industrial star delta switch ! You take off in star and get good torque but then switch to delta and it increases the rpm ! I am not sure if this may improve the twizy performance much as its heavy but it might lower amp draw when its at higher speed !
Great video. I have a huge 3 phase motor from a front loader washing machine. Been wondering if it is worth setting it up as a generator due to the weight and starting fiction. The magnets are super strong and the coils are nice.
I have noticed bldc is the next big thing in celing fans, they offer high effiencey, and a selling point I guess, I have a couple of the 12v celing fans, for camping , rv's and such! Nothing like the new 3phase bldc, fans, well I'm not sure why they would rectify AC, then convert to 3phase, seems any gains would be lost in conversion, being mains powered I'm not sure the voltage either, the small 18" 12v fans I have work fine! They can be noisy, great video!
It might have something to do with the motor cost. An AC motor running at the low RPM needed for a ceiling fan needs lots of poles - at least sixteen. That's lots of separate coils, lots of magnets, and lots of physical space to fill with material of suitable magnetic properties. It may well be cheaper to use a simpler-construction and more compact BLDC motor, even after considering the cost of the driver electronics and power supply.
While Delta wired motors is always 3 wires, 3 wires may be either Delta or it may be a Wye without a neutral wire, and 4 wires is a Wye with a neutral wire, but most 3 phase Wye motors do not need a neutral as current is never conducted on the neutral. As for solder points, a 4th solder point not connected to anything may very likely be neutral of a wye and just 3 solder points may still be a wye where the neutral is not soldered to the board. With Wye configuration you always energize 2 coils at a time. With Delta configuration you only energize one coil at a time.
Most drivers use the senter for sensing and drive two windings, if center is used at all. With Wye two coils would be powered, while delta it would effectively be all 3 with different ratios.
@@erlendse your mostly right on the delta coil energized, and I was just wrong. With Delta, most of the time all three coils are energized, but there are moments (instances) when anyone of the coils have 0 current, as the current moves to reverse direction. Are you sure that wye neutral is used for sensing? My axial flux BLDC motor on my channel is wired wye and neutral is not used.
@@kreynolds1123 The sensing part is true for some of the 6 step BLDC drivers. Not used on motors with sensors, or vector control. Many actually don't use the center wire or simulate it with 3 resistors. The drivers that use it have 4 connections for the motor.
@@erlendse ahhhhhh, I see. For back emf based electronic speed controllers, three resistors in wye create a virtual neutral to compare against and detect the zero crossing. I see that a virtual neutral network or resistor can work with both Delta and Wye motors. But, without a virtual neutral one needs a Wye motor with a real neutral wire as a Delta can not provide a neutral reference without a virtual neutral.
Thank you for the video, I have a Grundfos domestic circulator that I want to run DC, it has 3 coils, 6 terminals, how do I work out which three to connect together?
Those brushless aquarium pumps are cheap / good source for a dumb brushless. They're potted, but its a good source of controller + motor, for less than 20$.
How did you know to run your motor on 6V? If it isn't obvious from the source (e.g. 12V fan), is there a way to discover the input voltage w/o burning out the motor?
Great video, I want to use a DC motor for a vertical axis wind turbine as a generator and it is not self-starting. How can I design a starter circuit to feed power until it starts rotating and stopping the feed power?
PC fan is only 2 phase usually. 1 solder spot is the common. You can also tell by how many 'spokes' on the star shaped part. A multiple of three 'spokes' is three phase. A two phase motor will have a multiple of 2 'spokes'. Luckily the PC fan motor has 4 'spokes' and the CD ROM motor has 9 'spokes' so there is no confusion with a number of spokes that is both a multiple of 2 and 3.
How about a video on a DIY brushless motor driver. I have attempted this but was unable to come up with a good solution to track the position of the motor. Which is very important. I assume this is done by sensing, and reacting to the inductive kickback on each coil. Are you aware of any relatively simple ways to do this? I know the speed controllers are cheap and easy to get, but its still a fun project to make your own.
i hope it's not too tedious to make these basic knowledge videos, i'm sure many will find these basic rundowns helpful. even if it's only to reignite the spark of creativity
I have a one SP-35RC-600s motor i'd like to run this motor with 5v input but i don't have good knowledge about 5 wires connection. can you please explain how do i connect 5v to run motor?
Hi Mr Robert. Ihave the cdrom motor. That runs well but as if it were free spring inside it I mean there is a noise like little spring parts inside. That is normal or not? Thanks
Im going trough and liking your videos please put advertising on so i can help you make money sir I want to help you! i truly hope the love energy I get from your kind soul and sharing true knowledge! can you Do a video on vortices and there energy! Mt lakish is even said to age the human by about 2 weeks a day from what i have seen and there is a static machine that uses water to get the static electricity how can this be enlarged how do you think the water hammer pump that pumps water with a syphon and has waster loss as the need for continuance that may be pumped with alternative clean power like a small soarl pump like the farms of weed had these solar pumps they put in the streams to water thier crops and they could be secret for thier grtow life only going back to harvest no traffic allow for more green to make every one smile Like you make me smikle sir!
obviously "you" Need to move next to him, you get the southen weather,tiny portion plastic wrapped cold meats,icecream van's and Real cumberland sausages and real bacon rashers, down the road. and as a bonus you get the chance to buy a real classic electric "milk float" and convert to use rms's inks and related devices without import/export taxs and related over priced us>uk costs etc ;)
@@erlendse it DC was real input then you would not need to change currents. Those motors would work on pure sine wave with off phase. Their output is also sine wave. Those ESC just create varying currents from DC.
@@darkobul1 1. there are no sines from the driver, it actually outputs square wave. 2. No DC motor can have continous motion without some sort of switching. brushed DC motors use brushes to create AC for the coils in the rotor. The driver(often called ESC) does the job brushes would do on a brushed motor.
@@erlendse i know but that is change of current. That square wave gets damped by coils in motor and mare change of current from VCC to ground are also AC. But thank you for trying to explain it. Its very confusing.
The motor itsself is AC, but for practical purposes it is considered as a unit together with the electronics that drive it. In larger motors they even come integrated in one case. The electronics run off of DC.
Relying on counting the connections to tell the difference between star and delta configuration is waste of time. We manufacture thousands of the beasts and almost all are star and I've not seen one yet with neutral - 3 connections only.
bad assumption, the worlds a big place mate ,its got lots of stuff not manufactured by "you" in your backyard to a set process,and tiny 10k unit run, trust but verify is good practice to find that identical external form factor with different internal layout due the over valued cost/materials on hand at the time usually.
