Because of its advantages of simple structure, reliable operation, small size, small loss and high efficiency, and the shape and size of the motor can be easily changed, etc., the permanent magnet motor has a very wide range of applications, almost all over the aerospace, defense, agriculture, Manufacturing and livelihood in all areas of business people. However, in the past, the three-piece rotor housing was the mainstream in the architecture of permanent magnet brushless motors due to the design accuracy of the permanent magnets and the control of the stator clearance. The three-piece rotor housing consisted of an upper cover, a middle cover cylinder and a lower cover . However, the architecture of the three-piece rotor assembly may increase the overall assembly tolerance due to the increased number of parts. Although the permanent magnet motor can improve the performance, on the other hand, the reliability of the motor is reduced. In the meantime, in the past, the three-piece structure often leads to the coaxiality tolerance of the bearing holes of the upper and lower covers being increased because of the design of the longer bolts passing through the middle-diameter cylinder, thereby lowering the reliability of use again. Moreover, the assembly of parts is complicated, Thus increasing the manufacturing cost.
An outer rotor type motor includes a rotor, a shaft and a stator. The rotor includes a first shell, a second shell and a magnet set. The first shell includes a bottom part, side wall part and a flange. The side wall part is connected between the bottom part and the flange. The flange has a first connecting surface and a plurality of first positioning structures located on the first connecting surface. The second shell has a second connecting surface facing the first connecting surface and a plurality of second positioning structures located on the second connecting surface. The second shell is mounted to the flange so that the first shell and the second shell together form an accommodating space. The first positioning structures and the second positioning structures are protruding and depressed parts, and the shape of the protruding part matches the shape of the depressed part. The magnet elements are disposed on an inner wall of the side wall part. The shaft pivotally penetrates the first shell and the second shell. The stator is located in the accommodating space, and includes a stator frame fixed to the shaft and a coil set disposed on the stator frame.
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