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D Current Scaling Not 1:1

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D Current Scaling Not 1:1

‎03-27-2019 12:49 PM
2,763 Views
derekcook
Senior Contributor I

Hello, 

I am applying D current to my motor while running in speed mode to artificially load down my system to validate system functionality at high current. If I set the D current reference - tempStatorRefCurrentDQ.d to 150A, I get 50A of current on my A, B and C phases. What causes this scale factor? Why is the D current reference not instead adding 150A of current on my A, B and C phases? 

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‎03-28-2019 08:20 PM
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linestream-adam
Senior Contributor I

Derek,

When you modify the D axis reference, you are adding magnetic flux into the motor. This will change the response of the motor to Q axis current. Without monitoring both values, it is difficult to determine what the current value should be. Is the 50A you are measuring the peak value or rms value?

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‎04-11-2019 07:06 AM
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derekcook
Senior Contributor I

Adam, what would be the formula to determine how much current injecting D current (flux) should add to my system?

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‎03-29-2019 07:49 AM
2,600 Views
derekcook
Senior Contributor I

Hey Adam, 

I am aware I am adding magnetic flux to the motor. I just was wanting to know if there is any way to determine the amount of current injecting the magnetic flux will add to my system? I am monitoring RMS ABC current. 

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‎04-05-2019 05:29 AM
2,600 Views
derekcook
Senior Contributor I

Hey Adam, 

Is there a way to determine the amount of current injecting magnetic flux will add to my system? What is this equation?

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