and here's Hossein's hub based electric motor :
Hossein ; is this based upon a purchased part by a specific manufacturer ?
Hossein ; is your hub motor a purchased part or a full custom design that you made ?
I saw that this electric truck company is using wheel hub motors, so hub motors may be the best way to go to save space and provide the most efficient form of energy transmission with the lowest mechanical drive losses : https://www.lordstownmotors.com/pages/tech
First, my qualifications: I started riding powered two wheel vehicles at the age of ~4, shoehorned a Bridgestone 90 motor into a minibike at the age of nine (clocked by a cop at 71 MPH on it. He was not happy!), have built several roadracing motorcycles from the ground up, and have been street riding and road racing for sixty four years and roughly eight hundred thousand miles.
Additionally, I am a self taught expert in braking systems, having worked on motorcycle disc brakes for four decades. Sure, I made plenty of mistakes at first, none life threatening, and have learned volumes in consequence.
I would like to join this effort.
My email is: thardesign@yahoo.com
Basic requirements for a design of this type is to start with the motor and rear wheel and go from there.
First and foremost avoid hub motors. While they may work for heavy equipment such as trucks and the like where unsprung weight is of little concern: a hundred pound motor will have little impact on the drivability of a truck as it represents a tiny percentage of the weight of the truck.
On the other hand, a motorcycle is a completely different world as regards handling. Being light weight means that a heavy rear wheel represents a significant percentage of the total weight of the bike, all of which is unsprung, and at speeds much higher than ~30 MPH the reaction of the rear suspension hitting a bump will either throw the rear of the bike up in the air, or if the shock is valved to prevent this the wheel will leave the road due to considerable inertia and with only one wheel on the road things will get dicey. That's when moving in a straight line. In a corner the uncomfortable feel hitting a bump turns into a disaster, with the rear tire off the road the now hapless rider will find him/herself heading toward the badness past the asphalt with little chance of recovery.
The obvious alternative is to mount the motor to the chassis and couple to the rear wheel with a chain, toothed belt, or driveshaft.
Of the three the chain is the most efficient, but does require maintenance.
The belt is less efficient due to the fact that is must retain a minimum tension over the total stroke of the rear suspension to prevent cogging (skipping teeth) under hard acceleration. This is exaggerated by the ability of most electric motors suitable to this application to deliver full power at zero RPM, placing a huge load on the drive train.
The driveshaft is the most complex, costliest, least efficient, and the heaviest alternative by far, but does have the advantage of requiring little or no maintenance for the life of the bike.
Working on a motor / rear wheel assembly / swingarm.
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