Vehicle Instantaneous Torque in initial motion

AI Thread Summary
To determine the minimum torque required for an electric car to begin moving, it is essential to overcome total static friction. The discussion suggests measuring the starting force with a spring balance or using a vibrator to transition from static to dynamic friction. The torque needed is linked to the static friction, which represents the maximum torque before wheel slip occurs. The design also considers maintaining constant acceleration and velocity after overcoming initial resistance. Understanding these factors is crucial for selecting the appropriate motor for the propulsion system.
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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