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Failed to transmit from tracking to sensorless1 in FOC algorithm

Question asked by xiaofan gu on Dec 4, 2019
Latest reply on Jan 8, 2020 by Matej Pacha

Hello, there.

   I'm now working on single shunt FOC algorithm with S12ZVML31.

   I found that sometime it failed to transmit from tracking to sensorless1(as the picture show)

I think, when it changes state from tracking to sensorless1(purple line),the Speed Estamited error(red line), so my motor starts failed. But why it starts well in second chance?

So, why the speed estamite error or how can I solve this problem?