| 摘要 |
PROBLEM TO BE SOLVED: To provide a high energy density IPM type electric rotary machine at a low cost, by obtaining high efficiency rotary driving while reducing the amount of permanent magnet used.SOLUTION: An IPM type electric rotary machine 10 includes a rotor 12 in which a permanent magnet 16 is embedded, and a stator 11 functioning as an armature while housing the rotor to rotate mutually and housing a coil in the slots 18 between a plurality of stator teeth 15 facing the rotor. When the permanent magnet exists up to a d-axis side matching the central axis of each magnetic pole, the permanent magnets in such a range that a magnet flux in the direction of cancelling the armature flux generated by the armature on the d-axis side are replaced by a space (flux barrier) 17c of cavity having a small permeability. For example, in the structure where the number of slots per pole per phase q=2, the dimensional shape satisfies a relation; 1.38≤(number of magnetic poles P×permanent magnet size Wpm)/rotor diameter R<1.84. |
