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Controlling a big sepex
I am rebuilding an old SCT electric Rabbit. It has a shunt/sepex motor in it and a 108 volt battery. Currently, it has a controller on the field but not on the armature. It runs by idling the motor at full field; you let out the clutch to start and weaken the field to speed up. I want to install a controller on the armature, so I can raise the voltage to the motor's rated 144 and get better performance on hills. Will the open source controller work for that? I understand that, without the series field, there is not enough inductance for some controllers to work well. Would that be an issue here? Another question is regen. The car has it, and I want to keep it. Will it work to simply put a big diode across the controller to carry the regen current to the battery, or is it more complicated?
thanks, Steve Gaarder |
The syncronous rectification controller I think can be modified pretty easily to power a sepex motor. But if you already have a controller for the field, then I don't see why it would be a problem for the standard controller controlling the armature. With smaller inductance, it would mean current changes faster, which would mean possibly changing the P and I constants for the PI loop. I think jackbauer is running a sepex motor with the open source control board, and a custom IGBT controller. It's 11" diameter too.
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thanks, Steve Gaarder |
Oh, I finished a control board for a synchronous rectification controller, which can be modified (by changing software only) to control 2 separate coils.
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hey paul whats the odds on my getting hold of one of those boards? :)
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Hi Jack! I'll definitely send you one. I just need to order them. Here's the sequence of events that probably need to happen:
Somehow get $1000 for Eagle. Send in the board to China (pcb cart is CHEAP!) That's it... ///////////////////////////////////////////////////////////////// Instead, I will probably do the following: Send the board to that one super expensive place. Get like 3 of those friggen things for like $300 and feel real sad inside. //////////////////////////////////////////////////////////////// Option 3 is to send it to that one company that's quite a bit cheaper, but I need to get screen shots of it I think. I just need to do that. The bms and charger are ready for testing, so I'll do that first I guess. IT won't be long now for the control board. |
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I have a copy of Eagle Pro V5.9.0 that I can send out to you next week. Let me know if you want it. :thumbup: - Mark |
Ithaca, NY = ~1 hr drive from me. Cool.
Is this "Rabbit" a VW car? |
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thanks, Steve Gaarder |
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