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- I would like to design an electric rickshaw with two hub motors on the rear wheels and no differential. Is this best accomplished by having the motors in series or parallel and are complex speed controller algorithms required?
A mechanical differential is heavy and inefficient. To try and design an efficient e-rickshaw I would like to use a hub motor for each rear wheel. My initial enquiries suggest that wiring the motors in series would theoretically emulate a differential by maintaining the same same current and torque in each motor during the turn, but some sources suggest this is problematic in practice with one wheel over speeding. If the motors are wired in parallel they both see the same voltage but motors naturally resist being sped up or slowed down which might cause slipping and inefficiency during turning. Ideally I would like to avoid the complexity of having separate speed controllers and steering sensors. What is the simplest reasonably efficient set up?