You fell right into Mr. Tyng's trap ;-)
By definition, as soon as you add feedback of any kind to an "open loop"
controller (aka. non-feedback controller), it becomes a "closed loop"
controller.
Practically speaking, a true open loop stepper controller would be a
very poor steering controller because the terrain could easily cause the
stepper motor to mechanically miss a step. Once any step is lost, the
controller will never find true center again. Over time, random losses
would yield a Brownian Motion controller ... not what most people want
when driving a car.
A servo (any motor + position feedback) is the undisputed king of
steering mechanisms.
On 3/26/2014 1:43 PM, isaac goldman wrote:
2) any microcontroller these days can drive a stepper motor. Appropriate
control would ideally constitute a way to "zero" the motor's controller
in order to detect if a step was skipped, such as a magnet and hall
effect sensor on the shaft...
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