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|1. (WO2018079290) FLYING DEVICE|
|Applicants:||PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
This flying device comprises: a plurality of rotary blades; an electric motor element which is a drive source for each of the plurality of rotary blades and which rotatably drives a main shaft of the rotary blades; and a drive circuit. The electric motor element includes a stator, a rotor, and a pair of bearings. The stator includes: a stator core including an annular yoke and a plurality of teeth protruding inward of the annular yoke; and stator windings respectively wound around the plurality of teeth of the stator core. The rotor includes: a cylindrical permanent magnet part which is positioned inward of the stator core via a gap and which is positioned opposite to the plurality of teeth; a rotor yoke part which is inscribed in a cylindrical inner wall surface of the permanent magnet part; and a shaft which is fixed on the axial center of the rotor yoke part and which is connected to the main shaft. The pair of bearings rotatably fix the shaft and are positioned on both sides, in the rotation axis direction, of the rotor. The permanent magnet part includes P number of polar-anisotropic magnetic poles, wherein the P number is an even number and the weight of the rotor yoke part is less than the weight of the permanent magnet part. The drive circuit part controls a stator current flowing through the stator windings.