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Unread 03-10-2012, 15:26
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Re: FRC Blogged: - Motor Controllers

The issue of lifting the current limit doesn't have to come down to whether someone designs a single mechanism that exceeds 40A continuously.

If you place 8-10 of these Jaguars on a robot and occasionally they draw more than 40A from the power system via multiple Jaguars they can collectively draw enough power to adversely effect the robot power.

That's an interaction that is a little more subtle. The larger point of interest for me is whether they upped the wattage of the current sense resistor. In the old beige/gray Jaguars it was possible to heat that component so much it would reflow that resistor and open the circuit which would leave the attached motor dead in the water.

So I'm a bit curious to see how they'll handle that. Maybe they'll increase the wattage of that resistor or decrease it's resistance to handle the higher currents the existing MOSFETs can easily handle. Maybe they'll short it out but then you can't measure current like that.

In any event this action makes good FIRST assurance they'll make sure these are available. That's great because it makes things much more clear for everyone involved. Plus now LinuxBoy's CAN terminators are for an active product with an audience.

Last edited by techhelpbb : 03-10-2012 at 15:31.
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