Got motor? 
Thursday, November 9, 2006, 01:27 PM
I scored a motor off ebay. It's a Crown forklift motor - originally rated for 3.8hp at 24v. I'll be doing a bit more than that. Once it arrives I'll be pulling it apart and evaluating its condition. If needed, I'll be working over the armature and certainly the output shaft on my lathe. Bearings are easy enough to replace. If the field coils need work, I'll be shipping the casing off to Jim at Hitorqe - he's got all the right tooling for that kind of work.

Since I'm saving on the motor, I'm hoping to swing a mill sometime soon...
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ooh, bb600 user group 
Monday, November 6, 2006, 04:37 PM
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Still working on this beastie 
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!
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Mosfet controller upgrade 
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 I snagged a copy and put it at

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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Motors and models 
Friday, October 27, 2006, 12:16 AM
The perm sounds great - but the price is pretty stiff.
I ran across 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.

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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