Advantages of a new approach for estimating the stator resistance of a permanent magnet synchronous machine compared to known conventional methods

Usually, electrical propulsion vehicles are driven by highly dynamic drive controls. To make this possible, it is important to know electrical parameters such as inductances, flux and stator resistance as exactly as possible. In particular, the ohmic stator resistance R_s changes during operation due to temperature changes. Therefore, it is not possible to achieve a high precision over a wide operating temperature range with an offline measurement of R_s. In this paper, a new identification method for stator resistance is presented and compared to a known method. While the conventional method only works properly at certain operating points, the new method does not have this limitation.