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Unread 10-02-2011, 02:54
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Re: pic: In_CIM_erator

Quote:
Originally Posted by rahilm View Post
First thing, peak power is NOT peak efficiency. If you look a motor curve, you will find that efficiency is maximized at a much lower current than where power is maximized (at the intersection of the torque and speed lines).

Also, if using the electrical values to calculate output torque, you have to multiple the electrical power value by the motor efficiency at that point.
you are correct, my mistake

i still think it warrants closer inspection however.
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Unread 10-02-2011, 03:34
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Re: pic: In_CIM_erator

By the way, does anyone have documentation that BaneBots is using that particular RS-775 motor from Mabuchi? (I know there's a part number under the sticker affixed by BaneBots...I just haven't had the opportunity to look underneath and confirm it.) In the past, their motors appeared not to have been Mabuchi-brand.

(And just in case anyone is wondering, yes, this comes up all too often at inspection. Inspectors will often be noticing things like number and shape of vent holes and the colour of the plating on a motor, to quickly assess its legality.)

In fact, the same goes for the other BaneBots motors too. It would be instructive to publish a list of the manufacturers' real part numbers (to forestall future questions about which motor is which).

In 2009, BaneBots shipped totally different RS-550 and RS-385 motors to FIRST teams, despite presumably knowing that there was an FRC parts restriction (given that they were a supplier of KOP motors), and without updating their website to reflect the changes. Given that previous miscue, we probably ought to be cautious.
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