AD2S1210 NOISE

Hi omid1360 ,

Analog Devices North America will be on annual shutdown December 24, 2022 through January 2, 2023. Please expect delay in response. We will get back to you after the shutdown. Hoping for your kind consideration.

Regards,

JC 

Hi omid1360,

      The AD2S1210 provides the reference sine signal going to the resolver. The resolver then outputs the sine and cosine signal. If it is OK to share to us your diagram or schematic so we can have a much better understanding of the situation. But based on the information you shared, i would normally double check the connection especially the ground connection between the resolver and the AD2S1210. Also, another thing i would closely check, inverter switching start coupling on the system. Is it possible to place an isolator in between.

Regards,

Jonathan   

i attach for you schematic and feedback when igbt off feedback sin and cos is ok bout when igbt swich on feedback fined problem 

see video 

bout refrence out from pcb wave complete ok 

@omid1360 jcolao ,

From my understanding of this thread you are seeing coupling of noise onto the INPUT side of the PCB and thus the OUTPUT of the resolver. 

Based on that assumption I would further ask if the control signals or supply rails to the IGBT drive wired through the same harness as the resolver output?  If so is it possible to separate the signals and shield them?  I noted in your original post that you mentioned a shield connection to earth but it's not clear what is shielded or where and how the termination is done.

You also mentioned that you added filter components to the input and saw little effect?   Can you describe further what you mean by this and where you measured the response?

It would be also interesting to understand if you are seeing any issues with FAULTs being triggered in the device, specifically any clipping faults or LOS/DOS indications when the noise is present?  Further have you observed any error in the reporting of the position of the motor when its rotating vs when it is static?   The reason I ask is that while the signal noise is not ideal it may not impact precision if you sufficiently filter the noise energy prior to the RDC inputs.  This information would help us segment the problem so that you can focus on the root cause of the noise coupling.

Sean

HI

thanks my means from shiled usually two side encoder cable must connect to eart one side from motor soket connect to motor body and connect to eart another side from inverter must connect to eart bout problem when from inverter side connect shield to eart completed feedback fined problem 

for igbt signal far from ad2s1210 circuit no any efect from magnetic bout vcc and gnd same 

wonderfull is refrence from output opamp from inverter wave is ok bout after return from encoder sin cos u see one viedo negative side have problem and one noise this from swiching igbt have large amplitude and small time 

i add 1kohm and capacitor 2.2n for filter one input 10% can beter feedback 

HI

thanks my means from shiled usually two side encoder cable must connect to eart one side from motor soket connect to motor body and connect to eart another side from inverter must connect to eart bout problem when from inverter side connect shield to eart completed feedback fined problem 

for igbt signal far from ad2s1210 circuit no any efect from magnetic bout vcc and gnd same 

wonderfull is refrence from output opamp from inverter wave is ok bout after return from encoder sin cos u see one viedo negative side have problem and one noise this from swiching igbt have large amplitude and small time 

i add 1kohm and capacitor 2.2n for filter one input 10% can beter feedback 

HI

thanks my means from shiled usually two side encoder cable must connect to eart one side from motor soket connect to motor body and connect to eart another side from inverter must connect to eart bout problem when from inverter side connect shield to eart completed feedback fined problem 

for igbt signal far from ad2s1210 circuit no any efect from magnetic bout vcc and gnd same 

wonderfull is refrence from output opamp from inverter wave is ok bout after return from encoder sin cos u see one viedo negative side have problem and one noise this from swiching igbt have large amplitude and small time 

i add 1kohm and capacitor 2.2n for filter one input 10% can beter feedback