Kinetis Motor SuiteのトピックRe: D Current Scaling Not 1:1

D Current Scaling Not 1:1

derekcook — Wed, 27 Mar 2019 19:49:49 GMT

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?

Re: D Current Scaling Not 1:1

linestream-adam — Fri, 29 Mar 2019 03:20:30 GMT

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?

Re: D Current Scaling Not 1:1

derekcook — Fri, 29 Mar 2019 14:49:09 GMT

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.

Re: D Current Scaling Not 1:1

derekcook — Fri, 05 Apr 2019 12:29:20 GMT

Hey Adam,

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

Re: D Current Scaling Not 1:1

derekcook — Thu, 11 Apr 2019 14:06:38 GMT

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