Gokart Stepper Power Steering Help

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The discussion focuses on building a gokart with regenerative braking and stepper motor power steering instead of traditional mechanical steering. The main challenge is determining the required torque and force for the stepper motors to turn the wheels when stationary, factoring in the weight distribution of the kart, which is approximately 400 lbs. Key calculations involve the coefficient of friction, normal force, and the relationship between torque and radius, though the appropriate radius to use remains unclear. The conversation emphasizes the importance of mechanical trail and scrub radius in achieving effective steering. Assistance is sought to clarify these calculations for optimal performance.
polylabs
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Hello PF, A friend and I are building a rather cool Gokart with regenerative braking and UltraCapacitors etc...

Instead of using conventional mechanical steering we plan on using stepper motors for a makeshift power steering system

My question is I can't figure out the required Torque/Force the motors need in order to turn the wheels at rest. I know that as your speed increases you need less force to steer so if I calculate for rest I can cover everything.

I know my calculations need to include: Coeffecient of Friction and Normal force, and that torque = radius * force, but I don't know which radius to use.

The weight of the kart is about 400lbs with the majority at the back with the motors etc..

Any help would be much appreciated.
 
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It is all about the mechanical trail and scrub radius. See http://www.optimumg.com/OptimumGWebSite/Documents/OptimumK%20Help%20File%20v1.1/KPI%20_%20Caster_legacy.htm" for more info.
 
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