I am making a homemade mid drive ebike. This bike will have the motor driving the front cassette which is modified with a freewheel so the pedals are stationary. However, since the freewheel is one way, when I pedal manually with motor shut off the motor will turn. The friction is not noticeable so I want to take advantage of this by welding the rear freehub, so the motor is constantly spinning. Before I do this I want to know if this is a good idea or not.
Basically I want to take advantage of the motor's spin for regenerative braking, but am unsure it is feasible. The drivetrain from motor to rear wheel is 8.3 times speed reduction to increase torque, so if the motor could be driven by the rear wheel when it is unpowered, it would spin 8.3 times as fast as the rear wheel and generate a lot of electricity (theoretically). With the current set up the only time the motor will spin unpowered is if I pedal. But if I welded the freehub at the rear wheel, the entire drivetrain (and motor) will constantly be spinning as long as the bike is moving but freewheel at front cassette will ensure pedals remain stationary.
Has anyone else tried this? And is regeneration feasible for ebikes?