Questions about alignment and putting current in InstaSPIN-FOC

Youngkyun,

"NOVEL METHODS FOR PARAMETERS INVESTIGATION OF PM
SYNCHRONOUS MOTORS"

The above its the title to a good app note I used for determining the Ld and Lq of my motor. The results were accurate. The FAST routine in my F28027 controller was only off by about 5%. In this paper they show how to align the rotor to get the d axis and q axis alignment and how to apply the current. Not difficult at all.

-Chuck

The InstaSPIN-FOC motor identification feature only measures a single Ls value, it can not determine Ls_d and Ls_q independently. However, if you know or can determine the Ls_d and Ls_q you can load them into FAST at any time and these values will be used in the estimations.

most motors have a small amount of difference, but it doesn't end up affecting the estimations, the angle, or the overall efficiency so much. specially designed rotors (interior permanent magnet) with very large differences (saliency) can have the estimations, angle, and efficiency improved slightly by using correct inductances. remember that these inductances change with current usage and the differences become smaller.

Q1. How can I align the rotor to specific axis(d-axis, q-axis)?
We demonstrate this by the use of the RsRecal feature to align tot he D-axis.

Q2. How can I put current to specific axis(d-axis, q-axis)?
Iq_Ref_A is current to q-axis; Id_Ref_A is current to the d-axis