Hub motors on a reverse trike freighter.

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ynot

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May 28, 2021
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64
So many questions, so can I run two hub motors in parallel, on one controller, & 1 throttle potentiometer, given a controller that will deliver the amps, (battery power not a problem)?.
If I use brushed motors, they will work for cornering, the motor on the inside will slow and the outside will speed up, no problem,
does this hold true for brushless, or will they be electrically synchronous?

Is it best to start a new thread with a new type question or hook it to the back of a previous thread, do not want to be rude.
 

JosiahLuscher

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Jun 29, 2021
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It's a really bad idea to put two brushless motors on one ESC. Does it sort of work? Yes IF both motors are identical, and the load on them is identical. But it's still a really bad idea, plan on failure if you try it, and try to get it on video! ;-)

Here is a You Tube video with some information and tests with brushless airplane motors.

View: https://m.youtube.com/watch?v=SlYQRFzksPw
 

ynot

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May 28, 2021
Messages
64
Thanks Josiah,
I bit the bullet Sunday and ordered two motors each with their own controllers, but am planning on using one throttle.
Grin ebikes has a video on running multple motors on one bike which gives a wiring diagram for the partial parrallel wiring.
Likely a month before they arrive so have time to do more research.
 

BatGroupCraft

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Oct 12, 2021
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I think that the performance of brushed and brushless is fairly similar, because the power goes straight to the copper wires just as fast in a brushless motor without using the graphene rods, and then the magnetic field is the same in both designs.
 

ynot

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May 28, 2021
Messages
64
I think that the performance of brushed and brushless is fairly similar, because the power goes straight to the copper wires just as fast in a brushless motor without using the graphene rods, and then the magnetic field is the same in both designs.
 

ynot

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May 28, 2021
Messages
64
Not sure if brushless are phased so if one is run slower or faster as in cornering, will it put them out of phase, since each will have its own controller that should not matter.
However, the hub motors were lost at sea, I suspect they were lost when the container ship caught fire off the city of Victoria BC., not sure if I will
re order them, as circumstances have changed....................... funny how that happens.
 

BatGroupCraft

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Oct 12, 2021
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Not sure if brushless are phased so if one is run slower or faster as in cornering, will it put them out of phase, since each will have its own controller that should not matter.
However, the hub motors were lost at sea, I suspect they were lost when the container ship caught fire off the city of Victoria BC., not sure if I will
re order them, as circumstances have changed....................... funny how that happens.
I think all motors are phased in a sense, if they are single phase they are still pulsed so that the next forward force is happens in front of the magnetic field, and then it can be switched off and wait until the magnetic field is ready for another forward force. by the way, if you want to post c complete thread full of images and research, people will be pro at motors at the endless sphere site.
 

ynot

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Joined
May 28, 2021
Messages
64
You are right that the energy output of an electric motor has a certain phase depending on the number of poles.
My experience with brushed dc motors is that a pair of them wired in parallel or series will allow one of them to respond to increased load by slowing down/drawing more amps/or both. When the load returns to equal they respond by equalising revs and amps.
Not sure if the same holds true for brushless motors, using one speed controller.
 

BatGroupCraft

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Oct 12, 2021
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Hmm yes I think that the controller would become confused when the two wheels change sequence a bit on turnings, the hall sensors on one hub will be at different times compared to the other, so two controllers would be necessary. You can run two controllers from one throttle so that's ok. I'm not totally sure, some folk at the motor forums would be really buff knowledge about it.
 
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