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as5047d drift?,Vd voltage -10

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ziumus
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Joined: 2018-09-14 10:33
Posts: 24
as5047d drift?,Vd voltage -10

Hello, i have problem with encoder as5047. Vd voltage with rpm goes to negative value.

It start increasing from 0V at 0rpm to  -10V at 30k eerpm .

 Vd voltage should be 0 at all rpm range ?

Tried SPI and ABI intefrace,and few other motors

motor works very stable, but less torque than observer.

 

abi.png

district9prawn
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Last seen: 1 month 3 weeks ago
Joined: 2018-04-26 12:18
Posts: 124

This is not right. The D axis voltage should hover around zero volts. Can you show the rotor position plot for the encoder?

ziumus
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Last seen: 7 months 3 weeks ago
Joined: 2018-09-14 10:33
Posts: 24

This is encoder 5% duty

enc1.png

 

this is observer 5% duty

obs1.png

 

 

and encoder 95%

enc95.png

ziumus
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Last seen: 7 months 3 weeks ago
Joined: 2018-09-14 10:33
Posts: 24

also error difference observer and encoder on 95% duty is 25%

I think plot is looking good, only diference is 5 times ratio, that is only on chart, but in vesc code, it uses real angle.

no spi errors