| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 104 === This research developed two interior permanent magnet brushless motors for small power applications. The small PM brushless motors mostly used surface-mounted design in the market. However, interior and inset motors can generate additional reluctance torque and have better magnetic energy density. This thesis demonstrated interior motors can meet performance of existing motors with less permanent magnet volume.
This study chose I-type and spoke-type interior motor designs because cuboid magnets are easy to produce with low cost. The inset motor uses more expensive arcuate magnets in comparison. The magnets of the interior motors are also easy to assembly. The spoke-type motor proposed in the thesis can reach or exceed the performance of the inset motor.
Considering ease of manufacture motor design should choose low number of poles and slots. For 4-pole and 6-slot design the inset motor has larger torque and lower ripple than the interior motors. For 6-pole and 9-slot design the spoke-type interior motor has better performance than the inset motors. The 6-pole and 9-slot design has much larger torque than the 4-pole and 6-slot design but add higher production cost. The 6-pole and 9-slot spoke-type interior motor design is selected and made for this research.
Both I-type and spoke-type interior motors are successfully designed, manufactured and tested. The motors have a stator outer diameter of 15 mm, rotor outer diameter of 7.5 mm, and length of 5 mm. The spoke-type interior motor achieved maximum speed of 16,600 rpm and highest torque of 3.31 mN-m at 1A single-phase excitation. In the future, this small motor can be applied to motor vehicles, unmanned aerial vehicles, and robots.
|
|---|
