| Abstract |
In this paper, a novel position sensorless vector control for IPMSMs is described. First, we define a novel coordinate frame (hereafter called the maximum torque control frame), which has one axis aligned with the current vector of the maximum torque-per-ampere (MTPA) control and propose a sensorless control method for directly estimating the maximum torque control frame. Because the parameter Lqm for estimating the frame is less affected by magnetic saturation than the conventional Lq, the influence of magnetic saturation on the position estimation can be greatly suppressed. In additional, excellent current vector loci are observed even when Lqm is approximated by a constant value. This method is robust against changes in inductance caused by magnetic saturation. After defining an extended electromotive force model based on the proposed frame and a parameter Lqm for an estimation of the frame, we confirm the effectiveness of the proposed method by simulations and experiments. |
