Is there a way to hook two motors together back to back?

[silviasol]

I want to upgrade the power on my scooter since just one 63mm motor struggles at 30mph and there is very little power at low speeds. Since I am using vesc controllers I can use two controllers to power two motors simultaneously. In order to fit in my frame and motor mount they have to be back to back, please see pictures.

This is the mount. I will have another one made that is longer and have another cnc part that will screw/lock on to opposite side of the aluminum tube for bolting the second motor

Fits into the frame like this.

So I would need a way to connect the motors at the bell housing. Any idea's?

 

[MrDude_1]

use a motor coupler. from google examples: https://www.anaheimautomation.com/products/coupling/motor-coupler-list.php?cID=33&cdID=55

you find them on all kinds of CNC and other drives where there might be some small amount of misalignment between the motor and its output shafts. boats and farm machinery use huge ones, but the CNC ones are about right for your size.
They're usually used for connecting a stepper motor to a ballscrew shaft.

 

[silviasol]

use a motor coupler. from google examples: https://www.anaheimautomation.com/products/coupling/motor-coupler-list.php?cID=33&cdID=55

you find them on all kinds of CNC and other drives where there might be some small amount of misalignment between the motor and its output shafts. boats and farm machinery use huge ones, but the CNC ones are about right for your size.
They're usually used for connecting a stepper motor to a ballscrew shaft.

Hey, anything new with your goped? I hope this upgrade will make mine as fast as yours

I am only seeing shaft couplers, nothing that will work with the bell. However now you got me thinking. I know the shaft is removable since I had opened my motor to add hall sensors. So I ordered a 500mm long 8mm shaft. I will pull the shafts out and add just one shaft then have a part cnc'd to fit in the middle of the tube between the motors.

 

[MrDude_1]

use a motor coupler. from google examples: https://www.anaheimautomation.com/products/coupling/motor-coupler-list.php?cID=33&cdID=55

you find them on all kinds of CNC and other drives where there might be some small amount of misalignment between the motor and its output shafts. boats and farm machinery use huge ones, but the CNC ones are about right for your size.
They're usually used for connecting a stepper motor to a ballscrew shaft.

Hey, anything new with your goped? I hope this upgrade will make mine as fast as yours

I am only seeing shaft couplers, nothing that will work with the bell. However now you got me thinking. I know the shaft is removable since I had opened my motor to add hall sensors. So I ordered a 500mm long 8mm shaft. I will pull the shafts out and add just one shaft then have a part cnc'd to fit in the middle of the tube between the motors.

Just use one long shaft, and cut the clip grooves and flats for the motors, and run them off the same shaft with the bells back to back. Then mount one side like you already do, and just bolt in a bracket to the 2nd motor on the other side. It doesnt have to be as overbuilt as the first side, since it doesnt hold the assembly in place, it just has to not let the motor core spin in the tube.

like this:

 

[silviasol]

like this:

I will wait for the shaft then order the motor. Want to make sure the shaft is not warped. That would be a good idea however the tube on the mount I currently have is not long enough, the motor will stick out so no way get the bracket secured that way. Maybe I can rig something up with the bracket inside the tube and have them side by side. I suppose with the front mount already being strong the 2nd motor mount will not need as much strength.

 

[MrDude_1]

just flip the L bracket I drew over, and it will reach back either into the tube or onto the scooters tube.

If you get drill rod, it will 100% be straighter than the shaft the motor originally came with. like this, but in whatever size your motor is https://www.amazon.com/gp/product/B002BBJ0CA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

 

[silviasol]

Thanks for all the great ideas. Any idea what kind of L bracket? Probably would have to get some to mount directly to the motor since the bracket that comes with the motor I think is bigger then the 3" tube of the motor mount based on pictures I have of when I tried to install it on my scooter before this mount. I think that is the same type I bought, a linear motion shaft.

 

[MrDude_1]

Thanks for all the great ideas. Any idea what kind of L bracket? Probably would have to get some to mount directly to the motor since the bracket that comes with the motor I think is bigger then the 3" tube of the motor mount based on pictures I have of when I tried to install it on my scooter before this mount. I think that is the same type I bought, a linear motion shaft.

I would use aluminum angle iron and make it yourself... I dont think you'll find anything off the shelf to really work. Besides, you did such a great job on the mount tube, might as well make the back side the same style.

 

[silviasol]

Actually that would make sense. Would be alot more safer not having the motor spinning outside picking up long grass or anything I ride thru or get your fingers cut off by accident, lol. The shaft is in my po box, going to pick it up tomorrow. Then order the motor as long as it looks good, then hopefully can figure something out to get it secured to the mount!