Permanent magnet motor rotor magnetic isolation groove setting method and permanent magnet motor rotor

The invention belongs to the field of permanent magnet direct current motors, and discloses a permanent magnet motor rotor magnetic isolation groove setting method, which comprises the following steps of: firstly, setting a first magnetic isolation groove group formed by a plurality of adjacent magnetic isolation grooves; a second magnetism isolating groove group formed by a plurality of adjacent magnetism isolating grooves is arranged; through different inclined arrangement of the magnetic isolation grooves of the first magnetic isolation groove group and the magnetic isolation grooves of the second magnetic isolation groove group, the interval angle of fan-shaped domains corresponding to the pole arc angles of the first magnetic isolation groove group and the second magnetic isolation groove group is smaller than a preset interval angle; the minimum distance between the edges of the first magnetic isolation groove set and the second magnetic isolation groove set is larger than the preset edge distance, fina