This blog documents the restoration, and conversion, of a 1965 Humber (Singer) Vogue to a fully electric vehicle. The Vogue will be powered by an 11kW(modified), 3 phase industrial AC motor, controlled by an industry standard Variable Speed Drive (VSD) or Inverter. To be able to produce the 400 volts phase to phase the VSD will need about 600 VDC of batteries. A big thanks to the contributors on the AEVA forum: http://forums.aeva.asn.au/forums/
Friday, July 22, 2011
Reversing solved and Battery warning identified
Anyway - now the motor runs either way - good.
The problem of the low-battery alert going off was not caused by the battery pack. The pack/BMS tested out fine using a couple of fan heaters as a load. I was able to duplicate the error by lifting a connection from one cell-pair to another momentarily and it got me to thinking. The motor cables go very close to the pack that was spitting the error.
Right at the point where the motor cables go next to the pack - on the inside of the pack - are the BMS wires - lots of them and running almost parallel to the motor cables.
So it's reasonable to assume that there is either capacitive or inductive coupling at play here.
To help with capacitive coupling I did the following:
Take an offcut of brass fly wire and attach some heavy wires.
Cover the mesh with waterproof gaffer tape. What a mess - but I'll hide it under the trays so no-one will ever know. Well almost no-one....
And re-install the pack in the car, adding bullet connectors to the wires connected to the fly wire sheild and grounding them. Actually the pack from this location is now in the boot and this is a different pack (pack #5) - just to see if pack #10 really did have a fault that I missed.
To help avoid inductive coupling, the motor cable conduit is now tied well away from the pack.
A vew from another angle to show height separation, grounding wires - and the messy tape.