The present invention discloses a waterwheel type aerator with a DC brushless motor, which mainly has a floating body； an externally rotating DC brushless motor disposed on the floating body, and two ends of a rotating shaft of the DC brushless motor respectively Projecting on two sides； and two sets of vanes respectively for watering at the two ends of the rotating shaft； wherein the brushless DC motor has a casing, an inner stator, an outer rotor and a rotating shaft； the inner stator is a plurality of exciting The stator of the coil is fixed in the outer casing, the outer rotor has a hub rotatably disposed on one side of the inner stator, and a plurality of magnets coupled around the hub, the magnet surrounds the excitation 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 protrude through the rotating shaft holes on the two sides of the outer casing respectively on the two sides of the outer casing. In this way, the creation can save energy and energy, reduce costs and extend the service life of the DC brushless motor.本創作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，本創作能夠達到省電節能、降低成本及延長直流無刷電動機使用壽命等目的。
