Vehicle Instantaneous Torque in initial motion

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SUMMARY

The discussion centers on determining the minimum torque required for an electric car to initiate motion, focusing on overcoming static friction. The participants emphasize that this torque must surpass the total static friction, which has not been quantified. Suggestions include using a spring balance to measure the starting force and employing a vibrator or unbalanced motor to transition from static to dynamic friction. The conversation highlights the importance of accurately calculating torque for effective motor selection in electric vehicle propulsion systems.

PREREQUISITES
  • Understanding of static and dynamic friction principles
  • Familiarity with torque calculations in mechanical systems
  • Knowledge of electric vehicle propulsion systems
  • Experience with measuring forces using tools like spring balances
NEXT STEPS
  • Research methods for calculating torque in electric vehicle applications
  • Learn about the effects of static and dynamic friction on vehicle acceleration
  • Explore the use of vibrational motors to reduce static friction
  • Investigate torque specifications for electric motors in automotive design
USEFUL FOR

Engineers, automotive designers, and students involved in electric vehicle development, particularly those focused on propulsion system design and torque calculations.

Timeforheroes0
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Hi,
I'm designing a propulsion system for an electric car as a part of a college project. I'm trying to find the minimum torque needed so the car can begin to move, I'm assuming this will be the greatest torque required for motor selection, provided the vehicle will accelerate relatively constantly and then maintain a constant velocity.
There will be direct transmission so the only loading I can think of in the car is the static bearing loading that must be overcome. Assuming I know the acceleration of the vehicle, How would I find this torque?
Thanks for any help..
 
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The torque will have to initially overcome the total static friction. That has not been specified.

Can you measure the starting force needed with a spring balance?

If you put a vibrator or an unbalanced smaller motor on the vehicle you will be able to rock it sufficiently to change the static to the lower dynamic friction.
 
Baluncore said:
The torque will have to initially overcome the total static friction. That has not been specified.

Can you measure the starting force needed with a spring balance?

If you put a vibrator or an unbalanced smaller motor on the vehicle you will be able to rock it sufficiently to change the static to the lower dynamic friction.
I'm actually making a model of the proposed car to maximise fuel efficiency (km/kWh) so there's no way of doing any physical tension.
I was under the impression that the total static friction was the maximum torque that could be applied to the car without it the wheels slipping?
 

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