A drive is the electronic device that harnesses and regulates the electrical energy delivered to the engine. The drive feeds electrical power in to the motor in various amounts and at various frequencies, thereby indirectly controlling the motor’s swiftness and torque.
So the most economical choice will be a Three Stage Induction motor Electric Drive Motor china followed by a BLDC engine. I’d suggest BLDC ( for its huge marketplace penetration in recent times,simple availability and easier consumer electronics/control ) or PMSM 
(Permanent magnet synchronous motors )