How to measure the Phase Voltage?

jiangfeng — Mon, 07 Aug 2017 11:05:08 GMT

Dear Daniel:

Which pin is used to detect the Phase Voltage in the following figure? HS0,HS1,and HS2?

Besides， Is the phase voltage described above correspond to Ua,Ub and Uc in the flowing figure? Thank you very much ,my friend.

Re: How to measure the Phase Voltage?

Daniel_Popa — Tue, 08 Aug 2017 07:02:05 GMT

Hi jiangfeng‌,

I presume you need it for the BLDC sersorless drive based on phase BackEMF zero crossing. At each commutation phase (is you use the standard 2 out 3 phase commutation technique that maximize the torque) you will need to read the HSxxx that corresponds to the un-powered phase. You will need to implement your own logic algorithm to read and update the phase voltage of each phase.

In case of PMSM it is not very helpful since since by default you know/control the amount of voltage that you apply to the motor. Overall in this case might be helpful to know if a transistor is broken.

And, yes - it corresponds to Ua/Ub/Uc phase voltages.

Hope this helps!

Daniel

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How to measure the Phase Voltage?

Re: How to measure the Phase Voltage?