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Originally Posted by HaroldinCR
By the way, where are all the controller hackers/builders hiding ? I have 22 days before I start disassembling 3 OEM controllers to see what I can scrounge for parts. Then, I have 18 days to make sure I have enough parts to try to build/buy/whatever, a workable controller. It's pure D hell getting stuff shipped into this country.  |
A populated controller from Paul Holmes is the way I went (I also got a full AC Controller from him, and a DC controller .. so I *MAY* be a bit biased). The controller board fits in carry-on and was, I think, about $300. Under 5 lbs. I am putting Paul's controller onto an known-good but old ... Allan Bradley 1333 drive that has pooched current sensors. It will upgrade the thing from V/Hz or V/F to vector motor control, and from proprietary stuff that no one remembers to stuff I *COULD* change if I wanted to, and wanted to learn how to ... but I have the schematics and the source code so I can fix it as well.
Paul will likely ship it to you in parts, or any other way that would make it easier to bring in. I would not recommend getting the board built locally and doing your own component sourcing if you have trouble importing parts
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About the 2 speed thing:..., the voltage doubler might work, IF I can locate a Prius inductor, and an electric motor can be wound up a long ways above rated RPM's, so, why can't I gear low enough to pull the problem areas and then use the voltage doubler for maintaining higher speeds, as long as that feature is controllable ? I am constantly being shot down over this idea ? I can even liquid (mineral Oil) cool the motor AND controller. What's the big deal ?
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I would like to try this method as well. It allows for 48V .. or a lower pack voltage in any case .. for use in town. No boost control up to your 48V .. then control the duty cycle of your boost to adjust for max speed and for max current.
I have been warned that the rotors in 3 phase AC motor are not balanced for 3X rated speed (1800 rpm rated, 5400 rpm is 3X) but I have put some metal between me and the motor and tested a 5 HP industrial AC motor to these speeds. Not with full load, but with over half load.
The torque falls off above 1780 rpm unless you keep increasing the voltage to maintain rated current ... and it heats up *FAST* ..
Sorry ... I'm writing a book again ... time to stop!