2 motors 1 ESC - can a single ESC drive 2 separate brushless motors? 

Thanks

Grrr you beat me too it, that's what I was gonna suggest for giggles. That will almost definitely end in magic smoke 😀

It has been done. Also I've been running 2 brushless motors off one esc for over 15 years

@@stevec7596 how do you do it?

@@JessHull some motors are wound as 2 parallel motors in one. Ive seen the 2 windings connected to 2 escs. It's probably not a great idea, but it can work.

Thanks mate!

Thank you Sir!

Go for it and have fun!

And if the 2 centre wires were in series? But I guess there's no way to provide that configuration. If you took current sensing from the telemetry, could you drive a pitch change servo mech using that in place of torque sensing?

rip efficiency

@@9e05cherianpadipurackalvar6 in what means? That's an interesting question as many older RC systems used 2 brushed with one ESC and a common gear. High power, high temperature, high consumption, but less motor wear and better sound. The only problem I see inthis video is the lack of synchronicity, If one has morque load, with a common gear, the other helps. If weight is not a problem, how could efficiency ruins this config?

This is what i suggest, thus increasing the torque etc.

Yes...I was thinking the same thing.

@@MrApache64AH also increasing the mass adds magnetic Flux density and so on

If and only if both motors are lined up before attaching them to the shaft - both having the magnets precisely aligned with the coils. If you do that, if the magnets of each are lined up and the coils of each are lined up, then you've just made a taller motor. if the coils and magnets are NOT aligned, it'll just vibrate rather than spin.

It's very likely they have the same number

Modern 4in1 should handle those big motors no problem. Only remember about capacitor

thats what I'm doing on some of my planes and it's working perfectly fine. If you don't use dshot you have to independently calibrate your esc's to do the same thing though

Not until iNav can use an airspeed sensor. Imo

@@rougeneon1997 I would think it could be linked to the barometer... so that specific code would want higher barometric pressure as a guide perhaps.

It will fly well. Already tested ;)

What would happen if you simply relied on the traction of the tires to keep them synced?

I like the idea. If you ever tested this do let us know.

That's my concern for my idea. Wonder if the ESC would handle the feedback?

I dont believe it can unless you can sync the motor signals from the 2 escs

@@dsmandrewa thats no problem, wire both escs to the same dshot output. The escs read the motor position too so they might just support each other. You'd have to make sure you wired them all right though, if you had 1 reverse and one normal with the same wiring bad things would probably happen.

I like your thinking, I reckon if you were able to sync them in INAV/Betaflight then perhaps.. but you probably wouldnt get the same 140A combined that you would on a quad because plane fuses typically have significantly less airflow going through them. Advantage- being able to stack them under a flight controller. Disadvantages- The wiring would be quite messy and as with quads.. If the ESC burns, it often also burns your FC. In this day and age with so many planes using FC's which already have onboard BEC's, I'm surprised no-one has brought out an FC mountable & sized plane ESC with the Quad tech, it would probably be quite popular. Thoughts?

@@paulhope3401 with dshot you don't even need to do that, even if they wern't synced it would just create an inbalance in power (I think) they'd still be reading the same zero crossings on the motor, just that one would be trying to accelerate it less. Yeah sure airflow is a thing but lets face it 140A is probably way more than you need even on 4s. More likely if your 60A motor was spread over 4 they'd share 15A each (hopefully). 100% we need some fplane/wing FC/ESC combos. Especially for 1/2s builds where keeping it light and compact is key.

@@frasersteen Yeah, that makes sense. I'm actually so intrigued by this question that I've asked it in the 'power systems' section of the RCG forum. There are some very clued up EE's on there that will no doubt be along shortly to tell us what is likely to happen.. See- www.rcgroups.com/forums/showthread.php?3716205-Wiring-a-4in1-quad-Esc-all-outputs-to-feed-one-motor

This applies to every brushless motor

@@FPVUniversity thanks again for the video! learned quite a lot from this :D

yes

just take a bigger motor

I was just thinking that exact same thing.. Struggling to imagine with what application that would be useful though.

@@paulhope3401 I'm thinking size constraints. Instead of stacking the motors place them side by side and lock the bells rotation with a belt. But yeah it isn't to practical.

@@Quick-Flash I was thinking a shaft going through one motor in the middle of the plane to the one on the front (or rear) in a high power setup when achieving CG would otherwise involve adding dead weight to the opposite end of a plane when having a single large motor at eeither end of a fuse. I guess the space between both motors could still be utilsed for the electronics if you were clever with the wiring.

IMO, can't go wrong with Emax because they've just been around for so long if that's the answer you're looking for.

@@nite31fpv17 I thought the RS2 motors (in this video)

@@TheTomy03ful yes they're RSII motors. What im saying is that the company "EMAX" is a pretty reliable company known for theyre motors particularly in high performance and racing

@@nite31fpv17 I see.

One phase on your motor might be damaged. It's one of the symproms

@@FPVUniversity thanks, I'll try swapping things about too and see if the fault moves

I'm glad you ask :) This experiment is on the works

I think it will not a problem as long you use pwm or other one way protocol without feedback. Bidirectional dshot will a problem I think..

If you mean two motors and two escs with one signal it works fine a lot of people run their twin engine planes this way.

but then why not just to get a bigger motor?

@@FPVUniversity because it would be useful in some applications where you need 2 motors to be 100% mechanically timed. Like a dart blaster maybe?

I have DC brushed Clodbuster… and why I’m looking at this video made by this nice gentleman.. brush as he mentioned has easy forward backward drive and now add the series parallel switch.. truck for 20 years of trail walking has done phenomenal. I see the brushless have the neutral transmission timing between the two motors. Is there a frequency switch or buffer. To recenter timing to The motors as they rotate!?! Now that’s a good question

Note they would have to be synced with the magnets and coils perfectly aligned. The ESC detects the instant that the magnet passes the coil. Without gears, it automatically syncs on start if there is no load.

They must identical, be mechanically synced with a 1:1 ratio AND with the same phase (alignment of windings/magnets). The latter is almost impossible to achieve since there is no easy way to tell if the phase (rotation angle of the shaft) of one motor is the same as the other. And even then it would be hard to mechanically perfectly align them.

yes

Of course is does

back then ESCs were pricey so they would use this method for twin planes also it could be used for weight purposes if it is an issue

Yeah on forums (not everyone reads them) and I don't see many vids covering this. Not everyone reads all the forums and watches all the videos on RU-vid like you. It's always good to get a second opinion and updated information to cycle it to the new people in the community. Try being positive, bro.