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#1
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Re: Legally Increasing Motor Performance
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Prior to the Los Angeles regional, we ran our motors on a variable power supply set to 15 volts, current limiting to 3 amps. The motor was run for roughly a hour and a half till its free spin current(comm was coupled to a .25" shaft supported by a Tetrix bushing) dropped under .25 amps. A couple weeks before the championship event, we heard about the water break in method.. After googling for a bit, we came up with this link(http://www.wattflyer.com/forums/showthread.php?t=7409) in addition to a few youtube videos of RC competitors breaking in their motors underwater. We went ahead and used a 3 to 1 ratio of deionized water and 99% isopropyl alcohol(helps get rid of the water inside of the motor after we're done with the break in). After submerging the motor underwater, we turned on our variable power supply and let it run at 15 volts for roughly 15 minutes. At the end of the 15 minutes, we dried the motor and put it back on the power supply to measure free spin current. We were able to drop the motor's free spin(without shaft) to 0.09 amps at 15 volts. Attaching the motor to a shaft and running it at 15 volts resulted in having a current draw of 0.18 amps. We also attached reflective tape to our minibot shafts for testing of motor speeds via contactless tachometer. Without either break in, we were coming out to roughly 9200 RPM at 15V. After the break in, 9800 RPM at 15V. There was a significant performance increase. I'll post a few videos of our minibots(before and after)... Last edited by kiettyyyy : 04-05-2011 at 16:43. |
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#2
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Re: Legally Increasing Motor Performance
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The theoretical ideal brush advance changes with rpm and current draw, so it's going to be different at different points on the pole. It'd be really interesting if you could rotate the magnets around the motor as it climbed to change your brush advance dynamically as your bot climbed the pole. Or you could just go with a magnetic minibot + ramp and hit top speed before you even get to the pole. |
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#3
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Re: Legally Increasing Motor Performance
We fooled around with exterior motor magnets and increased the RPMS to 11000. It did counter act the weight on the magnets but the output shaft was spinning so fast that traction became an immediate issue.
It's possible but with what use would it be. |
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#4
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Re: Legally Increasing Motor Performance
When I was into RC Cars, I broke in my motors under water. I always ran the motors at 4.8 volts.
If you are going to attempt this, make sure to clean and oil the motor thoroughly. There are specialty products for cleaning and oiling that are available at most hobby shops. To be honest, I think your time would be better spent finding inefficiencies in their drivetrain/mechanisms... |
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#5
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Re: Legally Increasing Motor Performance
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Besides, it's a good task for new members on the team to do. |
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#6
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Re: Legally Increasing Motor Performance
Good point nighterfighter...
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