On Mon, 6 Jul 2009 03:05:21 -0400, "Buerste" wrote:

Imagine a simple fractional hp DC gearmotor with a torque limiter or torque
limiting clutch that powers a small machine at 60 or so RPM. Lets say the
machine jams and the torque limiting device kicks out. How can I cheaply,
easily sense this condition and turn off the motor?

This is a personal project and when I get it running it will amaze and
astound!


The torque of a DC motor is proportional to current, and vise versa.
You can limit torque by limiting current. If you want the motor to
turn off the motor at some torque level, simply turn it off if
current draw reaches a predetermined level. Any additional torque
limiting would be redundant unless there are dynamic considerations
you didn't mention.