EV cars

I'm not an expert on this, yet have an interest, and some knowledge of motors. US electric car, based in Almeda CA- some 5 years ago had a special designed motor for use in an automobile that they called the Dolphin motor ( although I may have miss spelled it) It was an AC pulse- push-pull brushless motor of some sort that they had engineered for the highest efficiency for the stop-go type driving encountered in normal highway driving.

To get the best advantage from a rotating electric motor that must constantly vary speed, and use electricity economically at various speeds given differing torque demands at those speeds- It is best to be able to control both the armature and field magnetism. In a conventional permanent magnet motor, the magnet field provided by the field is an "exciter" that caused current to be generated in the armature. The more powerful the permanent magnets, the more torque the motor will produce- at a compromise to rotor speed. A weaker field allows the motor to increase in speed. Using modern digital motor controls allows precise control of both these primary components of the motor if they are both wound wire armatures and fields. The best motor will take advantage of these variables by having a controller that is designed for the motor, that is as well designed for the task. All variables must be taken into account- weight- duty cycle, load demands, range, etc.

In speaking with an owner of a tour business that rents Segway, and other hi-end electric scooters and such, the Segway has the best range vs battery size of all his other models. This suggests that the Segway-( a very highly engineered traction device) has a sophisticated motor and controller device specifically designed per function. Theirs would be a motor system to study.