Method of controlling operation of synchronous motor and motor control
apparatus for the same
    8.
    发明授权
    Method of controlling operation of synchronous motor and motor control apparatus for the same 失效
    控制同步电动机和电动机控制装置的运行方法

    公开(公告)号:US5969496A

    公开(公告)日:1999-10-19

    申请号:US102356

    申请日:1998-06-23

    摘要: At the time of starting a synchronous motor (40), one method of the present invention assumes that the synchronous motor (40) rotates at a revolving speed of not less than a predetermined level, and detects an electrical angle of a rotor (50) according to a first detection process, which has a practical accuracy when the revolving speed of the rotor (50) is not less than the predetermined level (step S120). In case that the electrical angle has not been detected successfully, the method detects the electrical angle of the rotor (50) according to a second detection process, which has a practical accuracy when the revolving speed of the rotor (50) is less than the predetermined level (step S160). Another method first detects the revolving speed of the rotor (50). The method adopts the first detection process to detect the electrical angle when the observed revolving speed is not less than a predetermined level, and adopts the second detection process when the observed revolving speed is less than the predetermined level. Even when the rotor (50) has already been rotated by an external force or inertia at the time of starting the synchronous motor (40), the method enables accurate detection of the electrical angle.

    摘要翻译: 在启动同步电动机(40)时,本发明的一种方法假设同步电动机40以不小于预定水平的转速旋转,并检测转子(50)的电角度, 根据第一检测过程,当转子(50)的转速不小于预定水平时,其具有实际的精度(步骤S120)。 在电角度未成功检测的情况下,该方法根据第二检测过程来检测转子(50)的电角度,当转子(50)的转速小于 预定水平(步骤S160)。 另一种方法首先检测转子(50)的转速。 当观察到的转速不小于预定值时,该方法采用第一检测处理来检测电角度,并且当观察到的转速小于预定水平时采用第二检测处理。 即使当在启动同步电动机(40)时转子(50)已经被外力或惯性旋转时,该方法能够准确地检测电角度。