What is the difference between an electric bus with an AC motor and one with a DC motor?
The major difference in design between an alternating current (ac) motor and a direct current (dc) motor is the lack of brushes in an ac motor, thereby eliminating the need, and cost, of replacing them every few years. AC motors cost more, however, somewhat offsetting the reduction in maintenance cost. Regeneration appears to be easier to capture with a AC motor than a DC motor. However, the controller itself is less complex with a DC motor as it is not necessary to change the energy from DC (batteries) to AC (motors) with a DC system. AC and DC motors come in different sizes with different torque curves. As each have different characteristics and advantages, it is important to discuss the types propulsion systems available during the purchase of an electric bus.
