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Re: Joining 2 dif. motors
One reason to gear the motors differently (or to electrically change the ration in S/W) is that the Bosch can't seem to dump heat as fast as the CIM.
My team choose 3.5:1 as the gearing ratio (output of bosch gear box in high speed vs shaft speed of CIM) and found that we needed to drive the Bosch at ~70% to keep the heating approximately equal over the match. I think this year we will go for 1:4 and dump the Bosch gearbox to better match the motors. I think our problem was not only too low a gear ratio but the added load of the Bosch gearbox. We kept it in high gear to minimize that, but it would be best to use a single pinion to mate the Bosch with the CIM.
Excellent PPT presentation, Matt. You are dead on. Nice to see someone who knows what they are doing and takes the time to go through the math.
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