Motor Analysis Documentation

Parameters for motor to efficiently propel the car

• Given a weight of 192kg + 80kg = 272 kg

• Power required to keep car at a constant speed (https://www.engineeringtoolbox.com/cars-power-torque-d_1784.html)

  •  

    • F_t = total force on the car

    • V = velocity of car (in our case max of 104.6 km/h or 65 mph per regulation 12.23)

    • Z = efficiency

• TO DRIVE AT MAXIMUM SPEED OF 104.6KM/H, THERE NEEDS TO BE A ROTATION OF 993.77 RPM

  • Based on a calculation from MSXII (https://uwmidsun.atlassian.net/wiki/spaces/MECH/pages/34970113/Motor+Requirements) and a tire radius of 279.2mm

• AVERAGE SPEED OF 2017 WINNER WAS 69 KM/H

  • https://en.wikipedia.org/wiki/World_Solar_Challenge

• average speed of 2019 6^th place was 71.8 km/h, top speed of 80km/h

• 2019 winner Agoria had average speed of 86.6km/h

  • https://www.power-and-beyond.com/the-toughest-solar-car-race3022-km-powered-exclusively-by-the-sun-a-884764/

• In the last 3 comps, winners averaged greater than 56mph (90.1233km/h)

  • https://electrek.co/2017/10/08/world-solar-challenge-goes-live-solar-cars-racing-from-north-to-south-across-australia/

Does Mitsuba Motors meet this requirement?

• Mitsuba M2096D-III

  • Maximum power ~5kW

  • Nominal Power 2kW

  • 95% efficiency

  • 11kg + 3.5kg = 14.5 kg

    • Motor + controller

  • Nominal load rotation 810 rpm

    • NOT ENOUGH TO HIT TOP SPEED

• Fastest listed speed

  • Open

    

  • Fastest speed 82.7km/h at788rpm (eco controller)

    • Weirdly has 0 torque and efficiency

• PWM controller vs ECO controller

  • PWM

    • Constant harvesting efficiency

Other motors on the market that might meet these requirements better

Parameters include mass, power consumption, etc.

• CSIRO/Marand

  • https://renew.org.au/wp-content/uploads/2018/12/marand_high_efficiency_motor.pdf

  • This motor seems better than the mitsuba motor, but its very difficult to find info about it

• NGM SCM150 motor

  • file:///C:/Users/malco/Downloads/NGM%20Motor%20Specs.pdf

  • Can reach above 1000rpm

    • 1300 @ peak power

    • 1700 @ no load

    • Very heavy (20kg)

• Qsmotor 4kW car motor

  • https://www.qsmotor.com/product/4000w-car-motor/

  • Another possible option, but nothing standout

    • Only hits as high as 90km/h so actually this is not good

      • Might be able to over come this by using 2

Final conclusion

On 2/28/22, Jens said that the mitsuba motor was specifically selected to hit the 70-80km/h range, so we will be sticking with that