BLDC motors

Brushless DC motors have become increasingly important as the needs for energy saving and control have increased.
Chrysalis were tasked with producing a brushless motor controller that would:

Work from 30v
Would work up to 2A.
Could be controlled with an I2C serial bus.
Would run at 150 deg C
Could be built on a board only 35mm wide.
Uses winding voltage feedback because hall effect position sensors are not good at high temperature.

The 150 deg C requirement precluded any bought-in system and so a full design was done. All the hardware and software was designed and a prototype produced.
Because of the use of lead-free solder which has a higher manufacturing temperature, the normal FR4 PCB substrate will now operate successfully at 150 deg C.

After full testing this board is now working at the bottom of an oil well.