Gokart Stepper Power Steering Help

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SUMMARY

The forum discussion focuses on the design of a Gokart utilizing stepper motors for power steering, emphasizing the need to calculate the required torque and force to turn the wheels at rest. Key factors include the coefficient of friction, normal force, and the relationship between torque and radius. The Gokart weighs approximately 400 lbs, with most weight concentrated at the rear. Understanding mechanical trail and scrub radius is essential for accurate calculations.

PREREQUISITES
  • Understanding of torque calculations in mechanical systems
  • Familiarity with stepper motor specifications and applications
  • Knowledge of friction coefficients and their impact on steering
  • Basic principles of mechanical trail and scrub radius
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  • Research torque calculations for stepper motors in automotive applications
  • Learn about the effects of weight distribution on steering dynamics
  • Explore the relationship between scrub radius and vehicle handling
  • Investigate regenerative braking systems and their integration with power steering
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Engineers, hobbyists, and automotive enthusiasts involved in Gokart design, particularly those interested in innovative steering solutions and regenerative braking technologies.

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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