Method for reducing eddy-current loss of magnetic steel of all-neodymium-iron-boron permanent magnet motor at high speed and motor structure

The invention discloses a method for reducing eddy-current loss of magnetic steel of an all-neodymium-iron-boron permanent magnet motor at a high speed and a motor structure, which aim to effectively reduce eddy-current loss of neodymium-iron-boron magnetic steel by researching eddy-current loss distribution of neodymium-iron-boron magnetic steel of the permanent magnet motor or a magnetic flux path in a rotor and reasonably placing ferrite magnetic steel in a magnetic circuit of the rotor. The ferrite magnetic steel can be used for replacing or partially replacing neodymium iron boron magnetic steel in a permanent magnet motor or ferrite magnetic steel isadditionally placedin a rotor magnetic circuit. According to the permanent magnet motor rotor structure provided by the invention, through a mixing proportion form of neodymium iron boron and ferrite, the use amount of a rare earth permanent magnet material of the motor is effectively reduced, the manufacturing cost is greatly reduced, and meanwhile, the har