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Unread 21-01-2015, 12:34
adciv adciv is offline
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Re: actuating a brake or anti-backdrive

Provided your torque requirements aren't too high, and you're using a motor which can handle it, you can implement a brake in software. Short version, you can use a PID to maintain the position of the motor using a holding current. We've done this before using CIMs and Bag motors. This does require a sensor.
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I would not want the task of devising a system that 50,000 very smart people try to outwit.