重負荷が位置センサレス制御に及ぼす影響

摘要

PMSMs are high performance and high efficiency electric motors with a wide speed range. However, vibration and noise due to torque ripple often cause problems. As an example of a solution to the problems, a coreless synchronous motor using a Halbach array is proposed. In the previous study, a position sensorless control using induced voltage observer was applied to a Halbach field synchronous motor. In the low speed range, the position sensorless control with simple configuration was realized. Although the fluctuatin of the position estimation error was very small, the estimation error increased as the load increased. For verification, the same control was applied to IPMSM, but the same phenomenon occurred. In this paper, we apply the position sensorless control using induced voltage observer to a Halbach field synchronous motor and a IPMSM, and compare the responses. In addition, we examine the cause and the countermeasure that cause the position estimation error accompanying the increase of the load.%ハルバッハ界磁型同期電動機おょぴIPMSMに位置センサレス制御を適用し，応答を確認した。ハルバッハ界磁型同期電動機は高調波が少ないため，IPMSMに比べて速度の推定が高精度であることを確認した。また，位置推定誤差の原因は取得した電流のサンプリング遅れであることを明らかにし，その対策としてオブザーバに与える電圧と電流のサンプリング遅れを考慮することが有効であることを示した。