EV Powertrain Loss Calculator
Electric Vehicle (EV) Powertrain Loss refers to the energy wasted as heat across components such as the inverter, motor, battery, cabling, and transmission during power conversion and delivery in electric vehicles. This EV Powertrain Loss Calculator estimates these losses and provides the total power loss across the entire EV powertrain.
Enter the Input Power, Inverter Efficiency, Motor Efficiency, Gearbox Efficiency and the Cable Efficiency to calculate the estimated total power loss in various components of an electric vehicle powertrain.
Inverter losses occur mainly from conduction and switching losses in semiconductor devices during DC–AC conversion, influenced by switching frequency, load, and topology. Motor losses arise from winding resistance (I²R), iron losses from hysteresis and eddy currents, and mechanical friction. Gearbox losses result from gear-mesh friction, bearing resistance, and lubricant churning. Cabling losses are caused by resistive (I²R) heating in high-voltage conductors, increasing with current, cable length, and conductor size.
Example: Consider an input power of 100 kW to the inverter. The efficiencies are as follows:
- Inverter efficiency = 95%
- Motor efficiency = 90%
- Gearbox efficiency = 95%
- Cable efficiency = 98%
Power loss in inverter = 100 x (1 - 0.95) = 5 kW
Power after inverter = 100 - 5 = 95 kW
Power loss in motor = 95 x (1 - 0.90) = 9.5 kW
Power after motor = 95 - 9.5 = 85.5 kW
Power loss in gearbox = 85.5 x (1 - 0.95) = 4.275 kW
Power after gearbox = 85.5 - 4.275 = 81.225 kW
Power loss in cabling = 81.225 x (1 - 0.98) = 1.6245 kW
Total Power loss across the EV Powertrain = 5 + 9.5 + 4.275 + 1.6245 = 20.3995 kW.
