A drive is the digital camera that harnesses and controls the electrical energy delivered to the engine. The drive feeds electricity into the motor in different amounts and at different frequencies, thereby indirectly controlling the motor’s speed and torque.
So the most economical choice will be a Three Phase Induction motor followed by a BLDC engine. I would suggest BLDC ( for its huge market penetration 
recently,ease of availability and easier Electric Drive Motor china electronic devices/control ) or PMSM (Long term magnet synchronous motors )