Apparatus for detecting direction of rotation of rotor, related control and drive system and method

An apparatus for detecting a change in the direction of rotation of a rotor of a magnetic bearing comprises:-determination means (102) configured to determine a distance between the axis of rotation of the rotor and the center of gravity of the rotor,-comparison means (103) configured to: o, determine a change in the direction of rotation of the rotor when the absolute value of the rotational speed of the rotor is greater than a predetermined imbalance detection speed threshold (SB); comparing the distance between the axis of rotation of the rotor and the center of gravity of the rotor with a predetermined threshold value (Se), and o detecting a change in the direction of rotation of the rotor according to a result of the comparison. 用于检测磁性轴承的转子的旋转方向变化的设备包括：-确定装置(102)，其配置成确定转子的旋转轴线和转子的重心之间的间距，-比较装置(103)，其配置为：o当转子的旋转速度的绝对值大于预定的不平衡检测速度阈值(SB)时，将转子的旋转轴线和转子的重心之间的间距与预定阈值(Se)进行比较，以及o根据比较结果检测转子的旋转方向变化。