The invention discloses a waterwheel type aerator with a DC brushless motor, which mainly has a floating body； an external rotating DC brushless motor provided on the floating body； two ends of a rotating shaft of the DC brushless motor are respectively Protrudes on two sides； and two sets of blades are respectively combined on the two ends of the rotating shaft for fetching water； among them, the brushless DC motor has a casing, an inner stator, an outer rotor and a rotating shaft； the inner stator is a plurality of excitation The stator of the coil is fixed in the housing. The outer rotor has a hub that is rotatably disposed on the side of the inner stator and a plurality of magnets that are combined around the hub. The magnet surrounds the exciting coil of the inner stator, and the rotating shaft is fixed to the hub of the outer rotor. The two ends of the rotating shaft pass through the rotating shaft holes on the two sides of the casing and respectively protrude from the two sides of the casing. Therefore, the present invention can achieve the goals of saving power, saving energy, reducing costs, and extending the service life of a DC brushless motor.本發明公開了一種具有直流無刷電動機之水車式曝氣機，其主要具有一浮體；一設置在浮體上的外轉式直流無刷電動機，直流無刷電動機的一轉軸的二端分別突伸於二側；以及二組分別結合在轉軸二端用於打水的輪葉；其中，直流無刷電動機具有一外殼、一內定子、一外轉子及一轉軸；內定子為多數個激磁線圈的定子並固定在外殼內，外轉子具有一轉動地設置在內定子一側的輪轂，及多數個結合在輪轂周圍的磁鐵，磁鐵環繞內定子的激磁線圈，而轉軸固定在外轉子的輪轂，轉軸的二端穿過外殼二側的轉軸孔分別突伸於外殼的二側。藉此，本發明能夠達到省電節能、降低成本及延長直流無刷電動機使用壽命等目的。
