JPS6464546A - Stator permanent magnet fixing method for rotary machine - Google Patents

Abstract

PURPOSE:To shorten the rime used for a fixing work and to improve the reliability by compressing and deforming a bar-shaped tube of non-magnetic material and fixing a stator permanent magnet of a rotary machine by its elasticity. CONSTITUTION:Even numbers (4 pieces) of a permanent magnet 2 forming the stator magnetic field are placed on the internal perimeter wall surface of a cylindrical frame 1 of a rotary machine, and after fitting and inserting a metallic tube 3 of a non- magnetic and elastic material between permanent magnets 2 adjacently, it is pushed and pressed to the frame 1 of the rotary machine from the inside, and the stator field magnetic pole is fixed. In this manufacturing, a plurality of permanent magnets 2 are placed on the internal peripheral wall surface of the frame 1 of the rotary machine at equal intervals, and a stainless steel tube 3 having the same length as that of the permanent magnet 2 is inserted into a gap between permanent magnets 2 adjacent to each other. The tapered protrusions 4(a)-4(d) are provided to the peripheral surface of a mandrel 5 slightly smaller than the diameter of internal circumference of the permanent magnet 2, while these protrusions are pressed and inserted from the axial end of the frame 1, the stainless steel tube is subjected to a compressive plastic deformation, and the permanent magnet 2 is fixed to said frame 1.