Halbach array external rotor of composite-structure permanent magnet motor

The invention discloses a Halbach array external rotor of a composite-structure permanent magnet motor, relating to an external rotor of a composite-structure permanent magnet synchronous motor and solving the problems of magnetic coupling and flexible selection of pole numbers of a composite-structure motor. A rotor core of the external rotor is of a cylindrical iron core, all permanent magnets in the outer layer and the inner layer of Halbach permanent magnet array are tile-shape permanent magnets which are evenly distributed inside and outside the rotor core in the circumferential direction, and the inner surfaces of one sides of the tile-shaped permanent magnets with weakened magnetic field in the outer layer Halbach permanent magnet array and the outer surfaces of one sides of the tile-shaped permanent magnets with weakened magnetic field in the inner layer Halbach permanent magnet array are respectively and fixedly connected with the outer surface and the inner surface of the rotor core. Magnetic flux in the rotor core is extremely less whether pole numbers are equal or not, so that independent control can be realized, a whole hybrid power system is in coordinated operation, and motors combined together can flexibly select magnetic pole numbers as required by actual power grade and base speed.