Hello! I bought a S12ZVML12EVBLIN, download MC9S12ZVML128_PMSM_Sensorless, use my own motor, and modify the parameters in the software, the motor can up to more than 5000 rpm if unloaded. When I take a little opposition on it, erther low speed or high speed, it would out of phase and can't rotate normally. Is it means that the torque is so weak? Or the BEMF calculation is not exactly? How to solve this problem?