Monday, November 6, 2006, 04:37 PM
http://autos.groups.yahoo.com/group/BB600/| permalink |
( 3 / 3978 )Monday, November 6, 2006, 04:28 PM
I'm hoping to acquire a motor very, very soon. If I succeeed, I'll get to buy a new mill so I can manufacture the mount I'll need. Of course, then I'll have to add CNC capabilities... another project!| permalink |
( 3 / 4116 )Friday, October 27, 2006, 04:49 PM
Electric cars all seem to want IBGP controllers like the Zilla.
The reason? voltage. The problem? A single IGBT is something like $250/ea
For the motorcycle, 48-72 volts is acceptable. This means that we can use MOSFETs to do the power switching.
Over 80 volts or so, the on resistance goes up - meaning power is wasted, and heat is generated. Low on resistance = cool running.
For my bike, I'm planning to build my own controller. There's a simple mosfet design available on http://austinev.org/evalbum. I snagged a copy and put it at http://biobug.org/ev-motorcycle/controller/circuits/
It's intended for 24-48v and 200-400amps. That's based on the IRF1010. The IRF1010 is rated at 60v, 60A, 130W power dissipation and .011Ohm on resistance. ($1.27 or so at mouser) 4x = 240Amp
I dug around and came up with the Fairchild HUF75545P3. It's rated for 80v, 75A, 270W PD with .01Ohm on resistance. With these fets, it should be god for a 72V system. Not bad eh? ($3.29/ea at mouser)
4x = 300Amp, 6x = 450Amp.
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( 3 / 2776 )Friday, October 27, 2006, 12:16 AM
The perm sounds great - but the price is pretty stiff.
I ran across http://hitorqueelectric.com/ when I was checking out the white zombie ev racer. Frank of hitorque built some nice stuff. I think that I'm going to have him make me up an Advanced DC 6.7" motor. More on that later.
I found a great resource tonight.
http://www.seattleeva.org/
I've also decided that I'm going to build a model version to test with. (Think Back to the Future) I'm going to use it to develop my pwm throttle controller. A seperate module will house the mosfet pack. As the development progresses, I'll will publish the design - full source, schematics, etc. It should be fairly embarassing.
For some reason, the EV community is bad at publishing controller designs. A scanned in low res image just doesn't do it for me.
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( 3 / 2646 )Thursday, October 26, 2006, 04:52 PM
I'm not going to rebuild it to run on gas. I poked around the motor a bit. It has good compression, but all four carbs need to be rebuilt, and there are wiring problems, the throttle isn't completely set up properly, and a few other bad things. She's not getting on the road until she's full on EV.
If I do all the work to get it restored, I'll never do the EV conversion. Looks like I'll be selling off the extra parts.
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