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Rated power of motor is calculated from the combination of speed, torque and duty cycle; this establishes critical voltage, current, and capacity requirements of battery
Battery discharge current rating should meet or exceed motor current input requirements
Battery discharge curve is important because output voltage directly affects output speed of motor
https://auto.howstuffworks.com/electric-car3.htm
General info:
Typical motor: 20 000 watt-30 000 watt range
Typical controller: 40 000-60 000 watt range – eg a 96 volt controller will deliver a max of 400-600 amps
https://www.danatm4.com/blog/10-things-consider-choosing-electric-motor/
Things to consider when choosing a motor:
Vehicle Characteristics:
Size
Weight
Aerodynamic
These determine speed, torque and power requirements of electric motor
Driving cycles
Lots of stops/ vs long distances with only a few stops
Use to determine battery pack size, series/parallel
Maximum Speed:
Targeted max speed, how long does it need to be sustained
Rolling radius of wheel
Maximal torque:
– need to know if car will be ascending very high angles
– Can calculate highest torque required by ev considering gearbox(do electric vehicle’s even use a gearbox?)
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)
Battery Capacity
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