Quote:
Originally Posted by marccenter
Dear CD,
I was wondering if any teams that have progressed further into their build so far have determined that the elevator CIM motors overheat due to stalling?
I am assuming you are using a gearmotor attached to a CIM with a gear reduction ratio in the order of 50 to perhaps 90:1.
When the CIM elevator motor stops moving to hold a tote at a given height it is effectively stalled (motor speed nearly zero) and maximum current is drawn.
Have you found that your CIM elevator mount overheats in a two minute match? Were you holding one, two, three, or four totes?
Have you found it necessary to add an active braking mechanism to aid in the problem?
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We were worried about this, so we have a clipping device that holds our stack at the desired height while the lifter retracts and "rests" - at least until it lifts again.