Sensorless position detection of electric motor

The invention discloses an apparatus comprising an electric motor, the electric motor comprising a stator and a converter; a three-phase inverter electrically coupled to the electric motor; a power source electrically coupled to the three-phase inverter; and a controller communicatively coupled to the three-phase inverter. The controller is programmed to determine at least three measurements of flux linkages from the electric motor at different times, represent the measurements in Clarke coordinates, determine Clarke coordinates of a circle center of a circle defined by the Clarke coordinates of the measurements, and determine a position of the converter relative to the stator based on the Clarke coordinates of the circle center of the circle. 本发明公开了一种设备，该设备包括电动马达，该电动马达包括定子和转换器；三相逆变器，该三相逆变器电联接到电动马达；电源，该电源电联接到三相逆变器；和控制器，该控制器通信地联接到三相逆变器。该控制器被编程为：确定在不同时间来自电动马达的磁通链的至少三个测量结果，以Clarke坐标表示测量结果，确定由测量结果的Clarke坐标限定的圆的圆心的Clarke坐标，并且基于圆的圆心的Clarke坐标来确定转换器相对于定子的位置。