EVSPIN32G4 current sensing not working - standard settings

[ALedi.1]

I am trying to spin a 48V motor with an EVSPIN32G4 with standard settings.

The only thing I changed was increase the startup current to about 18 Amp and adjust my motor parameters.

The high frequency plot shows that the measured currents I_A and I_B reach OPAMP saturation, which is not the case because I measure the OPAMP V_OUT voltages simultaneously with an oscilloscope and the output voltage is barely moving except for the rampup alignment current that is programmed.

Another strange thing is that only Phase B OPAMP has the correct voltage of 1,65V when no current is flowing, the other two outputs have 0 V.

It would be awesome if someone has a clue on what I am doing wrong. Thanks!

[ALedi.1 · Accepted solution]

I found out that R50 only measured to 1,1 kOhm instead of 1,5 kOhm, and after close inspection with a magnifying glass I found a tiny amount of solder was on one side of R50...I removed it now the current waveform looks normal.

[Cristiana SCARAMEL]

Hi @AL.8edig​,

happy to see you quickly find the solution!

I would just to highlight that OPAMP3 output is expected low since in this configuration only OPAMP1 and OPAMP2 are used.

[ALedi.1]

thank you for the response, can you tell me how to set up that all three OPAMPs are used, like described in UM2850 page 13? In workbench, the third OP is automatically turned off, but in the user manual it is clearly stated that its possible to use all three

[Cristiana SCARAMEL]

Hi @AL.8edig​,

the MC Workbench currently does not support this Op-Amps configuration.