You know that alternators can run as motors. It needs a big and complicated electronic unit.
The rated power in generative mode is about 1400 Watts for a 14 Volts 100 Amperes altenator, for running in motor mode it needs 36 Volts power supply.
14 x sqrt(2) x 2 = 39.6 Volts, 36 Volts is not equal but it approche good it.
36 Volts is get by three lead-acid gel batteries.
For the regenerative mode (alternator) it needs to connect the three batteries in parallel and the inside alternator regulator allow batteries charging. You can connect an extra resistor for extra braking then batteries are charged.
For one little quadricycle with one alternomotor by wheel assumes approximatively 4 kiloWatts usable power. I take care about converter and alternomotors efficiency. The motor are not in the wheels for the confort of the vehicule but need gearbox (ratio 10) and cardan joints. For vehicule with or without suspensions.
Four synchronus motor need a curent sensing control. This is verry complicated beacause synchronuse alternator in motor mod are controled by sensing the angle of rotor and control unit work on phase between stator and rotor.
Big work for an electronician like me but not impossible.