On 11/19/2014 03:53 AM, andy pugh wrote: > On 19 November 2014 03:43, Jon Elson <el...@pico-systems.com> wrote: > >> I have also sold over 100 of the Pico Systems resolver to >> quadrature converter board. >> They can be used with any system that needs a quadrature >> encoder signal. > It should also be possible to use this with the "bldc" HAL component > to synthesize Hall sensor signals for a drive that requires them (or > direct phase amplitudes) > The problem is as our resolver converter is, NOW, it only produces quadrature plus index. So, until the motor is moved to the index position, there would be no absolute angle indication for commutation. The AD chip gives absolute angle output which we bring out to a header, so an additional board could be put in to generate the commutation signals from that. But, it would need to know the number of motor poles and the angular offset. So, such a board hasn't been designed. If enough people needed such a feature, we could come up with it.
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