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Limit current flow
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Limit current flow

by rdds on Sat Apr 09, 2016 3:11 pm

Hello,

I am trying to control following motor using DC & Stepper Motor Driver HAT Kit for Raspberry Pi (1.2A per channel and 3A peak current capability)

- Powerful Mabuchi RS-550 DC Motor with 77A stall current , 12V

Will I need to build a current limiting circuit OR add serial register to limit current flow under high load ? Or Is this already taken care of by the DC & Stepper Motor Driver HAT Kit for Raspberry Pi ?

Thanks
rdds

rdds
 
Posts: 4
Joined: Sat Apr 09, 2016 8:28 am

Re: Limit current flow

by adafruit_support_bill on Sat Apr 09, 2016 3:29 pm

There is no current limiting on the HAT. It does have a thermal protection shutdown circuit. But that doesn't always react quick enough to prevent damage in a severe overload condition.

If this motor has a 77A stall current, chances are its normal operating current is pretty far above the 1.2A continuous rating for the HAT.

adafruit_support_bill
 
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Re: Limit current flow

by rdds on Sat Apr 09, 2016 3:33 pm

Thanks for your response

- Rdds

rdds
 
Posts: 4
Joined: Sat Apr 09, 2016 8:28 am

Please be positive and constructive with your questions and comments.