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Size
Weight
Aerodynamic
These determine speed, torque and power requirements of electric motor
2. Driving cycles
Lots of stops/ vs long distances with only a few stops
Use to determine battery pack size, series/parallel
3. Maximum Speed:
Targeted max speed, how long does it need to be sustained
Rolling radius of wheel
4. Maximal torque:–
need to know if car will be ascending very high angles
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Can calculate highest torque required by ev considering gearbox(do electric vehicle’s even use a gearbox?)
5. Max power:
need to take into account drag, friction coefficients
peak power of electric motor cannot be sustained continuously, need to take time constraints into consideration(the car won’t need to climb the worst hill for the entire drive)
6. Battery Capacity
7. Battery Voltage:
Normally two ranges of voltages: 300-450 Vdc and 500-750V dc
Voltage limitations of IGBT(Insulated Gate Bipolar Transistors) used in motor controller and there are two main standard voltages available for them: 600V dc and 1200V dc