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What to do with regenerative current while driver is un-powered and the motors are spun.

Solution

Sometimes you will want to move your robot or vehicle while it is unpowered. The current generated when the motors spin could have the potential to harm the Sabertooth or SyRen motor driver. To alleviate this, you can build a simple circuit using a switch and diode. The diode should be 40-60V, ~5A. See attached diagram for circuit.

If you have a Sabertooth 2x32 and are not currently using the power outputs, you can take advantage of the built-in voltage clamp to sink the regenerative current. This requires power resistors, two of which came with your 2x32. See page 9 of the 2x32 datasheet for more information.

Attachments:
regen_current_sink.png regen_current_sink.png

 
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Article details
Article ID: 7
Category: Motor Drivers
Date added: 2013-06-13 12:02:19
Views: 1310
Rating (Votes): Article rated 3.5/5.0 (38)

 
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