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East Central, Nebraska | i think there is a little more to it. i believe that the hydraulic stepper motor is far more precise than the pwm. from what i have seen with a pwm it just starts the motor turning and catches up to the speed. it starts and stops as it can and not as where it is supposed to be. as i stated i do not exactly know how a 'hydraulic' stepper functions as i am unaware of the internal parts but i can only assume they are far more complex than a pwm system as they just seem to utilize any simple hydraulic motor that has the ability to pull the weight needed to run the planter. the steppers were precise in that you could tell it to turn exactly one revolution and it would do that. the old accurate monitor that the rawson control system came with originally would calibrate doing just that, one revolution. you would count the seeds dropped in that one revolution and that would be your calibration number. that number should resemble almost exactly the number of cells in the seed disk.
its my assumption until i am told different that i assume that a stepper was just way more coimplex, high maintenance and more expensive to maintain and repair. from what i have seen it made more sense for them to stay around then the pwm system in a planter situation. now in sprayers and spreaders and such the exact accuracy likely was not as critically required. pwm systems are just simpler. nevertheless that is the direction the industry went. | |
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Other uses for an Ag Leader Stepper seed control module 4001385
