Is an Electric Vehicle More Energy-Efficient at High Speed or Low Speed?

[ReidLee]

Theoretically, the electrical energy output of an electric vehicle can be 100% converted into mechanical energy, driving the wheels to overcome resistance and perform work. Whether at high speed or low speed, the theoretical power consumption is the same. In reality, the motor has a so-called optimal conversion point. At this optimal operating point, the motor's efficiency is the highest, making it the most energy-efficient. This point is not necessarily the highest speed nor the lowest speed, as it is not only related to the rotational speed but also to the load. Extension: The power of an electric vehicle comes from the motor, and the efficiency of the motor varies. For batteries of the same capacity, this can result in different ranges. Equipping the vehicle with a high-efficiency motor and controller can theoretically extend the range, which is equivalent to saving energy.