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How does Motor Torque change along the travel of the seat ?

naseeam asked
Last Modified: 2015-04-24
A Ford SUV Third Row Seats have Power Folding Seats.  With one-touch of a button seat travels from seated to folded position. Or from folded to seated position.  This requires some sort of obstacle detection.  While traveling if seat hits a suitcase, it will reverse.

Brush DC Motor drives the seat.

Please try to explain following sentence from a paper:

"With the considerable weight of a seat that is involved the motor torque changes along the travel of the seat, sometimes even reaching negative values in those positions where obstacles would most likely need to be detected."

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