Manufacturing method of motor

Abstract

A motor includes a rotor having a shaft disposed along a central axis extending in a vertical direction and a stator opposed to the rotor in a radial direction with a gap therebetween. The stator includes: an annular core back extending in a circumferential direction, a plurality of teeth extending from the core back in the radial direction, a plurality of coils formed of a conductive wire wound around the teeth. A manufacturing method includes, in at least one of the teeth: a step S 1 of forming a first coil winding the conductive wire around the teeth, a step S 2 of hooking the conductive wire of a winding end of the first coil to form a lead line; and a step S 3 of winding the conductive wire which is the same as the first coil and the lead wire over the first coil to form a second coil.

What is claimed is: 
     
         1 . A manufacturing method of a motor which includes:
 a rotor including a shaft disposed along a central axis extending in a vertical direction;   a stator opposed to the rotor in a radial direction with a gap therebetween; and   a plurality of busbars electrically connected to the stator, wherein   the stator includes:   an annular core back extending in a circumferential direction;   a plurality of teeth extending from the core back in the radial direction;   a plurality of coils formed of a conductive wire wound around the teeth, the coils forming a plurality of connection systems; and   an insulator, at least part of which is positioned between the teeth and the coils, and wherein   a first coil group including the coils, and a second coil group including the coils, the first coil group and the second coil group forming different connection systems, and wherein   the busbars include a first busbar electrically connected to the first coil group, and a second busbar electrically connected to the second coil group, the method comprising, in at least one of the teeth:   a step S 1  of forming a first coil winding the conductive wire around the teeth;   a step S 2  of hooking the conductive wire of a winding end of the first coil to form a lead line; and   a step S 3  of winding the conductive wire which is the same as the first coil and the lead wire over the first coil to form a second coil.   
     
     
         2 . The manufacturing method of the motor of  claim 1 , further comprising:
 a step S 4  of disposing the first busbar and the second busbar on the lead line; and   a step S 5  of cutting the lead line between the part on which the first busbar is disposed and the part on which the second busbar is disposed.   
     
     
         3 . The manufacturing method of the motor of  claim 2 , further comprising a step S 6  of connecting the first busbar and the second busbar to the lead line being cut. 
     
     
         4 . The manufacturing method of the motor of  claim 1 , wherein the insulator includes:
 a base disposed above the core back;   a first protrusion protruding from the base toward an upper side; and   a second protrusion protruding from the base toward the upper side, the first protrusion and the second protrusion disposed in the circumferential direction with a gap therebetween, and   wherein, in the step S 2 , the conductive wire is hooked on the first protrusion and the second protrusion to form the lead line in a position overlapping the gap in the radial direction.   
     
     
         5 . The manufacturing method of the motor of  claim 4 , wherein the base includes,
 a first inclined surface disposed on one side of the first protrusion in the circumferential direction where a distance between the first inclined surface and the central axis in the radial direction increases toward the upper side, and   a second inclined surface disposed on the other side of the second protrusion in the circumferential direction where a distance between the second inclined surface and the central axis in the radial direction increases toward the upper side, and wherein   winding of the first coil ends in a position in the teeth in the other side in the circumferential direction in the step S 1 , and   a winding end of the first coil is hooked on the first protrusion and then on the second protrusion in the step S 2 , and   winding of the second coil starts in a position in the teeth in the other side in the circumferential direction in the step S 3 .   
     
     
         6 . The manufacturing method of the motor of  claim 5 , wherein inclination of the second inclined surface with respect to the axis direction is less than inclination of the first inclined surface with respect to the axis direction.