電流形サイリスタインバータ，巻線界磁形同期電動機なrnどで構成される無整流子電動機は可変速電動機として各種rn産業分野で多数の採用実績があり，最近では舶用電気推進rnシステムの推進用電動機としても採用されている例えば。rnこの電動機は常に回転子の位置に同期してインバータを動rn作させるため，回転子位置検出器が必要である。従来からrn採用されている位置検出法として，軸に取り付けられた位rn置センサにより直接回転子位置を検出する近接スイッチ法，rn並びに電機子端子電圧を基に回転子位置の検出を行う誘導rn起電力検出法がある。%A self-controlled synchronous motor is being used as a variable speed motor in industries to date, and nowadays it is also used for propelling a ship. In this type of motor, the information of rotor position is needed to achieve stable operations. A simple sensorless starting method for this motor is studied in this paper. An initial rotor position detecting method without any position sensor is first discussed. It is shown that the position can be detected easily by observing the electromotive forces induced in the armature windings due to the change in the field current. Then, a new starting method for the motor is proposed on the basis of the DC link current chopping during the starting period. It is clarified that based on the proposed method the starting of the motor can be realized independently of the load conditions, supporting the usefulness of the proposed method. Finally, the effects of various parameters in the system on the responses of dc input current and motor speed during starting up are discussed.
展开▼
