Electronics > Mechanical & Automation Engineering

Is there a motor/drive system with intentional slip?

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Any good motor controller (with current/torque mode control) will have a programmable continuous current limit.  This limit is intended to keep the motor from overheating.  That's it's job.  So you pick a motor that's rated appropriately for the job, and set the continuous current limit to protect it. 
If you get a decent motor, it will also have an internal temperature sensor, which the above mentioned good motor controller will be able to measure and incorporate into the protection of the system.

Have a look at the video linked below.
It uses a weight on a string to run a clock, and every now and then the weight is rewound, and it uses a differential gear



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