Dears
We used STM32G431CBT3 in 5000W Three-phase Permanent Magnet Synchronous Motor Driver projects, now facing some issues below, could you help check and advise this, thanks!
1. There are some issues encountered in the project of driving with a three-phase permanent magnet synchronous motor. Please assist in resolving them. The attached file contains the design materials. If any other materials are needed, please inform us promptly. Thank you!
1. Driver parameters:
Rated power: 5000W (continuous operation with approximately 100A)
Peak power: 13500W (300A current flow for about 3 seconds)
Carrier frequency: 16kHz
Working voltage: 18 series lithium batteries (54V - 78V)
Operating environment temperature: -10℃ to 50℃
Motor slot-pole number: 36N, 42P
Test topology:
2. Problem Description: During the pulse experiment, the following issues were encountered. The double pulse parameters were (pulse current 400A, bus voltage 80V, auxiliary test inductance 5.6uH). Regarding the following several problems, we also made adjustments to the gate drive but the effect was almost negligible;
Problem One: When the single board was conducting the double pulse test, the waveform exhibited low-frequency oscillation. How to suppress it? We also compared it with the products of a competitor under the same conditions. The competitor was able to suppress this low-frequency oscillation quite well. How to improve this?
Waveform information: CH1 - Lower tube GS, CH2 - Lower tube DS, CH3 - Upper tube GS, CH4 - Current or Upper tube DS.
Question 2: During the double-pulse experiment (with a pulse current of 400A), the phase current output exhibited oscillation. How to suppress it?
Waveform channel information: Phase current sampling CH1 - lower tube GS, CH2 - phase current output of the operational amplifier, CH3 - upper tube GS (isolated differential probe), CH4 - inductor current (current clamp)
Question 3: During the 400A dual-pulse test, it was found that oscillations also occurred between the drain of the lower tube and the busbar GND. I wonder if this oscillation is the cause of the abnormal waveform mentioned above;
Waveform channel information: Phase current sampling CH1 - lower tube GS, CH2 - lower tube DS, CH3 - upper tube GS (isolated differential probe), CH4 - negative busbar - lower tube MOS source
