During testing today I suddenly lost feedback from the resolver and am getting the LORESAMP message. I'm assuming because the car is parked in the sun and it's 32°C in the shade, that the analog excitation amplifier (IC2) has overheated and failed.
There are two possible measures:
- Glue a small heatsink on top of it
- Make sure the output is almost rail-to-rail (9V) which increases efficiency
The latter means checking the resistor value of R40 and R41. They should both be 3k3 for 18kHz PWM frequency (standard in Leaf inverter).
I will investigate this further when I come back from holiday.
Possible overheating problem of excitation amplifier
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johu
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Possible overheating problem of excitation amplifier
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johu
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Re: Possible overheating problem of excitation amplifier
First thing I did this morning was check operation. It spins again 
So I guess the amplifier went into some kind of protection mode. So no matter what, I think better cooling is required.
So I guess the amplifier went into some kind of protection mode. So no matter what, I think better cooling is required.
Support R/D and forum on Patreon: https://patreon.com/openinverter - Subscribe on odysee: https://odysee.com/@openinverter:9