Hi, thanks for this lecture. It was useful and easy to follow. I have a question regarding the measurement of the d and q-axis inductance. You mention to lock the rotor by injecting a current in phase A and connecting phase B-C together with the negative of the source. Does this method work with delta-wound PMSMs? Again thanks for sharing your lectures!
Your D and Q axis are based on your rotor flux. But I'm not familiar with Delta winding pattern. If the stator flux vector is the same between Delta and Wye, then the approach should be the same. I'm curious, why you are using a Delta winding? What is the benefit?
Hello sir, I have hardware setup of AC DC AC power converter , PMSM coupled with PMSG and FPGA based OPALRT system. I generate spwm signal by keeping v/f ratio constant and inverter output current is feeding to the motor. Motor is running at 375 rpm, when reference speed of motor is increasing motor is start vibrating. Even in real time I changed voltage and frequency of modulated signal by keeping v/f ratio constant. Please sir help me
Hi Prof. Kuruppu. Thanks or the great lecture. Regarding the Ld estimation, I think there are two points that called me the attetion. The first one is related to the alignment of the stator and rotor magnetic flux. They should be in the same orientation, that is, North with North, shouldn' t they? It seems that they are opposite (38.06 min). The other point is that when we are applying a one-phase source to a - bc, the induced fluxes provocated by the windings b and c into the winding "a" are in opposition to its self-flux (in d direction). This will reflect differently, when the machine is supplied by three-phase sources, in its voltage terminals becouse in this situation there will be positive contribution in d direction. Is this consideration right? Thanks again for the lecture!
Hi Fabiano, nice to here from you. Actually, north and north will repel. North attracts to south pole and vice versa. That is why the rotor alignment will be like that. The inductance is a scalar measurement. You have to look at if it is an a or an a' winding. The current in those two travel in opposite directions, causing the fields generated by the two to have opposite polarity. So with a three phase source, you end up generating a rotating magnetic field. With a DC source your field is fixed with the goal of measuring the inductance. Hope this helps.
@@SandunKuruppu Thank you very much for the lecture, it was very helpful! I get the point about the model accuracy, but I am still wondering how I can calculate Ld and Lq from the FE results? Wouldn't this mean that I need to simulate a locked rotor system and then calculate the impedence?
