Motor, compressor, and motor manufacturing method

1. A motor comprising:

a rotor;

a stator that generates a magnetic field for rotating the rotor;

an insulator that is fixed to an end portion in axial direction of the stator, and that is cylindrical in shape; and

a winding wire that is wound around the stator via the insulator, wherein

the insulator includes

an external wall portion that is cylindrical in shape,

a plurality of winding drum portions that has one end portion thereof coupled to inner periphery of the external wall portion, and that extends in a rod-like manner from the one end portion toward radial direction of the external wall portion,

a plurality of internal wall portions that is formed to protrude from other end portion of the plurality of winding drum portions in axial direction of the stator, and

an opening portion formed in between each pair of the plurality of internal wall portions that are neighboring in circumferential direction,

in the external wall portion, outer diameter sides of the plurality of winding drum portions represent winding-drum-portion-side external wall portions, and outer diameter sides of the opening portions represent opening-portion-side external wall portions, and

the winding-drum-portion-side external wall portions have such thickness in radial direction that, in axial direction of the stator, leading end sides far from the stator are smaller than base end sides close to the stator, and thickness of base end sides of the winding-drum-portion-side external wall portions is greater than thickness of the opening-portion-side external wall portions.

2. The motor according to claim 1 , wherein the thickness of the external wall portion goes on increasing from side of the opening-portion-side external wall portions toward middle part of the plurality of winding drum portions in circumferential direction of the external wall portion.

3. The motor according to claim 1 , wherein, in axial direction of the stator, the external wall portion has greater height than the plurality of internal wall portions.

4. The motor according to claim 1 , wherein

the thickness of the winding-drum-portion-side external wall portions is different at one end in circumferential direction of the plurality of winding drum portions than the thickness at other end in circumferential direction, and

the thickness at the other end in circumferential direction is greater than the thickness at the one end in circumferential direction.

5. The motor according to claim 1 , wherein, the thickness of the winding-drum-portion-side external wall portions gradually becomes smaller with increase in distance from the stator in axial direction of the stator.

6. The motor according to claim 1 , wherein, on inner periphery of the winding-drum-portion-side external wall portions, a step portion is formed on far side from the stator in axial direction of the stator.

7. The motor according to claim 1 , wherein, on inner periphery of the winding-drum-portion-side external wall portions,

at one end in circumferential direction of the plurality of winding drum portions, a first shape portion is formed in which the thickness of the winding-drum-portion-side external wall portions becomes gradually smaller with increase in distance from the stator in axial direction of the stator, and

at other end in circumferential direction of the plurality of winding drum portions, a second shape portion is formed that has a step portion on far side from the stator in axial direction of the stator.

8. The motor according to claim 1 , wherein, in the plurality of winding drum portions, peripheral surface, around which the winding wire is wound, has a curved surface in which thickness of the plurality of winding drum portions in axial direction of the stator goes on increasing from both ends of the plurality of winding drum portions toward middle part of the plurality of winding drum portions in circumferential direction of the external wall portion.

9. A compressor comprising:

the motor according to claim 1 ; and

a compressing unit that compresses a refrigerant when the rotor rotates a rotary shaft.

10. A motor manufacturing method for manufacturing a motor that includes

a rotor,

a stator that generates a magnetic field for rotating the rotor,

an insulator that is fixed to an end portion in axial direction of the stator, and that is cylindrical in shape, and

a winding wire that is wound around the stator via the insulator,

the motor manufacturing method comprising:

making use of the insulator that includes

an external wall portion that is cylindrical in shape,

a plurality of winding drum portions that has one end portion thereof coupled to inner periphery of the external wall portion, and that extends in a rod-like manner from the one end portion toward radial direction of the external wall portion,

a plurality of internal wall portions that is formed to protrude from other end portion of the plurality of winding drum portions in axial direction of the stator, and

opening portions formed in between the plurality of internal wall portions neighboring in circumferential direction,

in the external wall portion, outer diameter sides of the plurality of winding drum portions represent winding-drum-portion-side external wall portions, and outer diameter sides of the opening portions represent opening-portion-side external wall portions, and

the winding-drum-portion-side external wall portions have such thickness in radial direction that, in axial direction of the stator, leading end sides far from the stator are smaller than base end sides close to the stator, and thickness of base end sides of the winding-drum-portion-side external wall portions is greater than thickness of the opening-portion-side external wall portions; and

winding that includes

extending a nozzle, which supplies the winding wire, from center side in radial direction of the insulator,

moving the nozzle rotationally in circumferential direction of the external wall portion and beyond the plurality of internal wall portions in axial direction of the stator, and

winding the winding wire from one end in circumferential direction toward other end in circumferential direction of the plurality of winding drum portions.

11. The motor manufacturing method according to claim 10 , wherein

the insulator is used in which, on inner periphery of the winding-drum-portion-side external wall portions,

at one end in circumferential direction, a first shape portion is formed in which the thickness of the winding-drum-portion-side external wall portions becomes gradually smaller with increase in distance from the stator in axial direction of the stator, and

at other end in circumferential direction, a second shape portion is formed that has a step portion on far side from the stator in axial direction of the stator, and

the motor manufacturing method comprises making leading end of the nozzle enter from the one end in circumferential direction and exit from the other end in circumferential direction.