Rotor and permanent magnet rotating machine

Abstract

A rotor adapted for a large permanent magnet rotating machine having high output and demagnetization resistance and the permanent magnet rotating machine are provided. The permanent rotating machine includes the rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots. The rotor includes one or more permanent magnets in each of two or more insertion holes, the insertion holes being formed in a circumferential direction in a rotor core. There is also provided the permanent magnet rotating machine including this rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots.

1 . A wind power generator having rated output higher than 1 MW comprising:
 rotor blades; and   a permanent magnet rotating machine comprising a rotor having a diameter of 500 mm or grater comprising one or more permanent magnets in each of two or more insertion holes, the insertion holes being formed in a circumferential direction in a rotor core, wherein a magnetic coercive force in a stator-side surface region of each of the permanent magnets is greater than that in an inner central portion by 300 kA/m or more, the inner central portion being an inner portion at a depth of at least 5 mm from every outer face of the permanent magnet; and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots.   
     
     
         2 . The wind power generator according to  claim 1 , wherein axial dimension of the rotor is about 500 mm or greater, the magnets are laminated in an axial direction, and the plurality of magnets are inserted in an axial direction into each penetrating hole formed in a rotor yoke so as to obtain length approximately equal to the axial length of the rotor. 
     
     
         3 . The wind power generator according to  claim 1 , wherein each of the permanent magnets is in form of rectangle having a side of 10 mm or longer in the circumferential direction and a side of 10 mm or longer along a rotary shaft. 
     
     
         4 . The wind power generator according to  claim 2 , wherein each of the permanent magnets is in form of rectangle having a side of 10 mm or longer in the circumferential direction and a side of 10 mm or longer along a rotary shaft. 
     
     
         5 . The wind power generator according to  claim 1 , wherein the permanent magnets are Nd-based rare earth sintered magnets. 
     
     
         6 . The wind power generator according to  claim 2 , wherein the permanent magnets are Nd-based rare earth sintered magnets. 
     
     
         7 . The wind power generator according to  claim 3 , wherein the permanent magnets are Nd-based rare earth sintered magnets. 
     
     
         8 . The wind power generator according to  claim 4 , wherein the permanent magnets are Nd-based rare earth sintered magnets. 
     
     
         9 . The wind power generator according to  claim 5 , wherein a distribution of the magnetic coercive force of each of the Nd-based rare earth permanent magnets is a result of diffusing Dy or Tb from a stator-side magnet surface toward the inside. 
     
     
         10 . The wind power generator according to  claim 6 , wherein a distribution of the magnetic coercive force of each of the Nd-based rare earth permanent magnets is a result of diffusing Dy or Tb from a stator-side magnet surface toward the inside. 
     
     
         11 . The wind power generator according to  claim 7 , wherein a distribution of the magnetic coercive force of each of the Nd-based rare earth permanent magnets is a result of diffusing Dy or Tb from a stator-side magnet surface toward the inside. 
     
     
         12 . The wind power generator according to  claim 8 , wherein a distribution of the magnetic coercive force of each of the Nd-based rare earth permanent magnets is a result of diffusing Dy or Tb from a stator-side magnet surface toward the inside.