Stator coil heating apparatus and stator coil heating method

Abstract

A stator coil heating apparatus and a stator coil heating method that are capable of effectively preventing a core from thermal deformation particularly caused due to a magnetic flux generated by a coil head, without the problem of heating temperature variation, and also shortening a time for the process of heating a stator coil, are provided. A stator coil heating apparatus A to heat a stator coil L wound around a circular core F, comprises: induction heating coil heads 1 and 11 that heat the circular coil L by generating an inductive effect acting from outside in the thickness direction of the core F, against circular winding coil bases La and Lb that are sticking out of end faces Fa and Fb of the core F in the thickness direction thereof; and shields 2 and 12 that block a magnetic flux generated by the coil heads 1 and 11 , out of the end faces Fa and Fb of the core F in the thickness direction thereof.

1 . A stator coil heating apparatus to heat a stator coil wound around a circular core, comprising:
 an induction heating coil head that heats the circular coil by generating an inductive effect acting from outside in the thickness direction of the core, against a circular winding coil base that is sticking out of an end face of the core in the thickness direction thereof; and   a shield that blocks a magnetic flux generated by the coil head, out of an end face of the core in the thickness direction thereof.   
     
     
         2 . The stator coil heating apparatus recited in  claim 1 , wherein:
 the shield is provided to the induction heating coil head, in a unified manner.   
     
     
         3 . The stator coil heating apparatus recited in  claim 1 , wherein:
 the coil head is looped in one plain or cylindrically, at approximately the same diameter as that of the circular winding coil base, and is positioned coaxially with the core, outside of the core in the thickness direction thereof, against each of the sides of the winding coil base in the thickness direction of the core; and   the shield is a circular one that blocks a magnetic flux generated by the coil head, out of the outer circumference area of an end face of the core in the thickness direction thereof.   
     
     
         4 . The stator coil heating apparatus recited in  claim 1 , wherein:
 the coil head is looped in one plain or cylindrically, and the coil head is positioned in an arbitrary location in the circumferential direction, from outside in the thickness direction of the core, against the winding coil base on each of the end faces of the core in the thickness direction thereof;   the shield is an arch-shaped one that blocks a magnetic flux generated by the coil head, out of the outer circumference area of an end face of the core in the thickness direction thereof; and   the stator rotates about its axis when the stator coil is inductively heated.   
     
     
         5 . A stator coil heating method to inductively heat a stator coil wound around a circular core, by an inductive heating coil head, comprising:
 heating the circular coil, by generating an inductive effect that acts from outside in the thickness direction of the core, against a circular winding coil base that is sticking out of an end face of the core in the thickness direction thereof, while blocking by a shield, a magnetic flux that is generated by the coil head and acts on an end face of the core in the thickness direction thereof.   
     
     
         6 . A stator coil heating apparatus comprising:
 a high-frequency induction heating portion that heats a stator coil and a circular core having the stator coil wound around the inner circumference of the circular core itself, by a high-frequency induction heating coil head provided in the central opening of the core, and   wherein:   the high-frequency induction heating portion is positioned coaxially with the core, outside of the core, against each of the end faces of the core in the thickness direction thereof, and   further comprising:   a shield that blocks a magnetic flux generated by the coil head, out of the outer circumference area of the core in the thickness direction thereof.   
     
     
         7 . The stator coil heating apparatus recited in  claim 6 , wherein:
 the shield is cylindrical or doughnut-shaped.   
     
     
         8 . The stator coil heating apparatus recited in  claim 6 , wherein:
 the shield is positioned in the vicinity of the outer end of the stator coil in the radial direction of the core.   
     
     
         9 . The stator coil heating apparatus recited in  claim 6 , wherein:
 the high-frequency induction heating coil head has a looped portion that is positioned in the vicinity of the stator coil, against one or both of the end faces of the core in the thickness direction thereof.   
     
     
         10 . The stator coil heating apparatus recited in  claim 6 , wherein:
 the high-frequency induction heating coil head is positioned in the middle region of the core in the thickness direction thereof, circumferentially around the core.   
     
     
         11 . A stator coil heating method to heat with high-frequency induction heat, a stator coil wound around the inner circumference of a circular core, by inserting a high-frequency induction heating coil head into the central opening of the circular core, comprising:
 positioning a shield that blocks a magnetic flux generated by the high-frequency induction heating coil head, out of the outer circumference area of the core, coaxially with the core, outside against each of the end faces of the core in the thickness direction thereof, and then heating the stator coil and the core by applying an alternating-current voltage to the coil head.   
     
     
         12 . The stator coil heating method recited in  claim 11 , wherein:
 the shield is cylindrical or doughnut-shaped.   
     
     
         13 . The stator coil heating method recited in  claim 11 , wherein:
 the shield is positioned in the vicinity of the outer end of the stator coil in the radial direction of the core.   
     
     
         14 . The stator coil heating method recited in  claim 11 , wherein:
 the high-frequency induction heating coil head has a looped portion that is positioned in the vicinity of the stator coil, against one or both of the end faces of the core in the thickness direction thereof.   
     
     
         15 . The stator coil heating method recited in  claim 11 , wherein:
 positioning the high-frequency induction heating coil head, in the middle region of the core in the thickness direction thereof, circumferentially around the core, and then heating the stator coil with high-frequency induction heat.