Ok, I'm serious enough about this to start a build thread. I've bought a Go cart frame and a motor. Now I just need to get my act together on designing the controller.
here's the hideous go cart (50$, craigslist local):
It doesn't have brakes, a seat, or a live axle.
It's too small for a real person, so I will cut in half and add a couple of feet to it.
and paint it (if it's lucky)
here's the motor (Ebay, used 380$, >500$ new):
Mars ME0709
• Voltage 24-72 Volts
• 8 continuous & 18 Peak Hp
• 300A peak
• 125A continuous
• Speed 3050 rpm at 72V Unloaded
• Size 8" OD, 6.75" long (w/o shaft)
• Shaft 7/8"x 1-5/8", 3/16" key
• Weight 36 lbs
Advertised "slighty used, for 30min for a science fair project"
So, if you haven't been keeping up with my recent flurry of motor contol circuit topics, the purpose of this build is only to learn how to make a high power motor controller. I eventually want to make a brushless controller, but starting out simple(r).
Oh, I forgot to give credit. Just to give an idea just to how much of an extent that you fellow forum members are carrying me through this project, these are all the related posts that have gotten me to the point I am now:
http://forum.allaboutcircuits.com/showthread.php?t=59767
http://forum.allaboutcircuits.com/showthread.php?t=59738
http://forum.allaboutcircuits.com/showthread.php?t=59764
http://forum.allaboutcircuits.com/showthread.php?t=59528
http://forum.allaboutcircuits.com/showthread.php?t=59654
http://forum.allaboutcircuits.com/showthread.php?t=59460
http://forum.allaboutcircuits.com/showthread.php?t=59148
http://forum.allaboutcircuits.com/showthread.php?t=59320
http://forum.allaboutcircuits.com/showthread.php?t=59310
http://forum.allaboutcircuits.com/showthread.php?t=59195
http://forum.allaboutcircuits.com/showthread.php?t=58843
http://forum.allaboutcircuits.com/showthread.php?t=58689
http://forum.allaboutcircuits.com/showthread.php?t=58926
http://endless-sphere.com/forums/viewtopic.php?f=14&t=32199
http://endless-sphere.com/forums/viewtopic.php?f=7&t=32231
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32172
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32073
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32040
http://endless-sphere.com/forums/viewtopic.php?f=7&t=31842
http://www.diyelectriccar.com/forum...ttempt-build-brushless-controlleri-63430.html
http://www.diyelectriccar.com/forums/showthread.php/why-pay-big-bucks-batteries-my-63437.html
http://www.diyelectriccar.com/forums/showthread.php/best-controller-and-whyi-62972.html
http://www.diyelectriccar.com/forums/showthread.php/ev-dc-controller-setup-62822.html
http://www.diyelectriccar.com/forums/showthread.php/ev-dc-controller-setup-62822.html
http://www.diyelectriccar.com/forums/showthread.php/diy-hybrid-generator-62670.html
http://www.electro-tech-online.com/robotics-mechatronics/121825-motor-load-sharing.html
http://www.electro-tech-online.com/general-electronics-chat/121752-generating-pwm.html
http://www.electro-tech-online.com/general-electronics-chat/121672-driver-hiperfet-module.html
http://www.electro-tech-online.com/...-does-kelvin-terminal-mosfet-module-work.html
http://www.electro-tech-online.com/...10-what-true-amp-capacity-isotop-package.html
http://www.electro-tech-online.com/...2-exceeding-relay-contact-current-rating.html
http://www.electro-tech-online.com/general-electronics-chat/121487-pwm-dc-motor-controller-ev.html
and here is a list of good websites and documents I have been reading:
http://powerelectronics.com/power_m...nt-limiting-eases-design-motor-drives-PET.pdf
http://www.ti.com/lit/ml/slup169/slup169.pdf
http://homepages.which.net/~paul.hills/SpeedControl/SpeedControllersBody.html
http://robots.freehostia.com/SpeedControl/SpeedControllers.html
http://robots.freehostia.com/SpeedControl/Mosfets.html
(and many others which I didn't print out, or printed out and lost, etc, can't remember them all)
and for the brushless design that I decided against doing, I read:
ww1.microchip.com/downloads/en/AppNotes/00899a.pdf
ww1.microchip.com/downloads/en/AppNotes/00885a.pdf
ww1.microchip.com/downloads/en/AppNotes/00887a.pdf
http://www.drivetechinc.com/articles/curbldc3.pdf
http://www.irf.com/technical-info/whitepaper/ir2137igbt.pdf
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=5206
http://www.atmel.com/dyn/resources/prod_documents/doc7658.pdf
http://krex.k-state.edu/dspace/bitstream/2097/1507/1/JamesMevey2009.pdf - huge BLDC book
http://www.instructables.com/id/Mak...ctric-Hub-Motor/step2/The-Brushless-DC-Motor/
http://ocw.mit.edu/courses/mechanic...trol-ii-fall-2007/lecture-notes/lecture05.pdf
http://www.4qd.co.uk/serv/MOSFETfail.html#dvdt - MOSFET failure modes
http://forum.allaboutcircuits.com/showthread.php?t=11499&page=4
here's the hideous go cart (50$, craigslist local):
It doesn't have brakes, a seat, or a live axle.
It's too small for a real person, so I will cut in half and add a couple of feet to it.
and paint it (if it's lucky)
here's the motor (Ebay, used 380$, >500$ new):
Mars ME0709
• Voltage 24-72 Volts
• 8 continuous & 18 Peak Hp
• 300A peak
• 125A continuous
• Speed 3050 rpm at 72V Unloaded
• Size 8" OD, 6.75" long (w/o shaft)
• Shaft 7/8"x 1-5/8", 3/16" key
• Weight 36 lbs
Advertised "slighty used, for 30min for a science fair project"
So, if you haven't been keeping up with my recent flurry of motor contol circuit topics, the purpose of this build is only to learn how to make a high power motor controller. I eventually want to make a brushless controller, but starting out simple(r).
Oh, I forgot to give credit. Just to give an idea just to how much of an extent that you fellow forum members are carrying me through this project, these are all the related posts that have gotten me to the point I am now:
http://forum.allaboutcircuits.com/showthread.php?t=59767
http://forum.allaboutcircuits.com/showthread.php?t=59738
http://forum.allaboutcircuits.com/showthread.php?t=59764
http://forum.allaboutcircuits.com/showthread.php?t=59528
http://forum.allaboutcircuits.com/showthread.php?t=59654
http://forum.allaboutcircuits.com/showthread.php?t=59460
http://forum.allaboutcircuits.com/showthread.php?t=59148
http://forum.allaboutcircuits.com/showthread.php?t=59320
http://forum.allaboutcircuits.com/showthread.php?t=59310
http://forum.allaboutcircuits.com/showthread.php?t=59195
http://forum.allaboutcircuits.com/showthread.php?t=58843
http://forum.allaboutcircuits.com/showthread.php?t=58689
http://forum.allaboutcircuits.com/showthread.php?t=58926
http://endless-sphere.com/forums/viewtopic.php?f=14&t=32199
http://endless-sphere.com/forums/viewtopic.php?f=7&t=32231
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32172
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32073
http://endless-sphere.com/forums/viewtopic.php?f=30&t=32040
http://endless-sphere.com/forums/viewtopic.php?f=7&t=31842
http://www.diyelectriccar.com/forum...ttempt-build-brushless-controlleri-63430.html
http://www.diyelectriccar.com/forums/showthread.php/why-pay-big-bucks-batteries-my-63437.html
http://www.diyelectriccar.com/forums/showthread.php/best-controller-and-whyi-62972.html
http://www.diyelectriccar.com/forums/showthread.php/ev-dc-controller-setup-62822.html
http://www.diyelectriccar.com/forums/showthread.php/ev-dc-controller-setup-62822.html
http://www.diyelectriccar.com/forums/showthread.php/diy-hybrid-generator-62670.html
http://www.electro-tech-online.com/robotics-mechatronics/121825-motor-load-sharing.html
http://www.electro-tech-online.com/general-electronics-chat/121752-generating-pwm.html
http://www.electro-tech-online.com/general-electronics-chat/121672-driver-hiperfet-module.html
http://www.electro-tech-online.com/...-does-kelvin-terminal-mosfet-module-work.html
http://www.electro-tech-online.com/...10-what-true-amp-capacity-isotop-package.html
http://www.electro-tech-online.com/...2-exceeding-relay-contact-current-rating.html
http://www.electro-tech-online.com/general-electronics-chat/121487-pwm-dc-motor-controller-ev.html
and here is a list of good websites and documents I have been reading:
http://powerelectronics.com/power_m...nt-limiting-eases-design-motor-drives-PET.pdf
http://www.ti.com/lit/ml/slup169/slup169.pdf
http://homepages.which.net/~paul.hills/SpeedControl/SpeedControllersBody.html
http://robots.freehostia.com/SpeedControl/SpeedControllers.html
http://robots.freehostia.com/SpeedControl/Mosfets.html
(and many others which I didn't print out, or printed out and lost, etc, can't remember them all)
and for the brushless design that I decided against doing, I read:
ww1.microchip.com/downloads/en/AppNotes/00899a.pdf
ww1.microchip.com/downloads/en/AppNotes/00885a.pdf
ww1.microchip.com/downloads/en/AppNotes/00887a.pdf
http://www.drivetechinc.com/articles/curbldc3.pdf
http://www.irf.com/technical-info/whitepaper/ir2137igbt.pdf
http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=5206
http://www.atmel.com/dyn/resources/prod_documents/doc7658.pdf
http://krex.k-state.edu/dspace/bitstream/2097/1507/1/JamesMevey2009.pdf - huge BLDC book
http://www.instructables.com/id/Mak...ctric-Hub-Motor/step2/The-Brushless-DC-Motor/
http://ocw.mit.edu/courses/mechanic...trol-ii-fall-2007/lecture-notes/lecture05.pdf
http://www.4qd.co.uk/serv/MOSFETfail.html#dvdt - MOSFET failure modes
http://forum.allaboutcircuits.com/showthread.php?t=11499&page=4
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