Monday, September 16, 2013

better, faster, ...

Step 25:  Work out the kinks.  Smoke escaped from the old PMC controller.  5 of its 8 power transistors are blown.  I suspect some had blown early in test driving.  It still operates the remaining 3 switches, but alone they can't provide enough current to push the car.  I will try to repair it but in the interest of getting on the road it will be replaced with a Curtis 1231c.  This has a higher current limit of 500A and a silent switching frequency.  

The Curtis 1231c is widely used and requires a heatsink.  I found one online and bolted it to the bottom using thermal grease.  I borrowed the fan from the old PMC and mounted it on the back.  There is good airflow out the end.

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