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Old 04-04-2008, 12:13 PM   #11 (permalink)
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Another thought, Tom:

Since the PWM controller isn't 100% efficient, another means of obtaining yet more speed (if you frequenly drive with your foot on the floor) would be a controller bypass. Based on controller efficiency figures I've seen tossed around on the EVDL, I think you'd see at least another 10% speed increase. Plus you could still use field weakening on top of a bypass circuit.

The challenge would be setting it up in such a way that didn't damage the controller from back EMF on switching the controller back into the circuit.

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Old 04-09-2008, 11:00 PM   #12 (permalink)
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Thinking more about this Tom - I think I can see a field weakening experiment in my future. Not predicting when, but it's a far easier thing to set up & manage than a controller bypass.
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Old 04-10-2008, 03:53 PM   #13 (permalink)
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FYI, Tom:

One of the EVDL Yodas has outlined possible hazards of using field weakening in concert with a PWM controller (potential for damage), and recommended several safeguards:

http://www.evdl.org/archive/index.ht...86%7Ca16615747

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