Motor and carrier vehicle

1. A motor comprising:

a shaft extending along a center axis;

a first groove, which is recessed in a radial direction and extends in an axial direction, on an outer side surface of the shaft;

a stator core into which the shaft is inserted; and

a rotation restrictor which is inserted into at least a portion of the first groove and restricts the stator core and the shaft in a circumferential direction.

2. The motor according to claim 1 , wherein

the rotation restrictor includes a columnar pin;

the stator core includes an insertion hole into which the shaft is inserted, and further includes a second groove, which is recessed to a radially outer side and extends in the axial direction, on an inner circumferential surface of the insertion hole; and

the pin is inserted into the first groove and the second groove.

3. The motor according to claim 1 , wherein the rotation restrictor includes a columnar portion provided on an inner surface of an insertion hole into which the shaft is inserted.

4. The motor according to claim 1 , further comprising:

a sensor substrate that detects a magnetic flux from a rotor rotating about the center axis; wherein

the sensor substrate is held on the shaft.

5. The motor according to claim 4 , wherein the sensor substrate includes a recess with an inner surface shape along an outer surface of the shaft, and a protrusion extending to a radially inner side from an inner surface of the recess.

6. The motor according to claim 1 , further comprising

a lead wire extending from the stator; wherein

the shaft includes a shaft portion and a flange portion that overhangs to a radially outer side from one side of the shaft portion in the axial direction;

the flange portion includes an opening through which the lead wire passes; and

the opening includes a notch connected to an outer side surface of the flange portion.

7. The motor according to claim 6 , wherein at least a portion of the opening on a radially inner side has a shape along an outer circumferential surface of the shaft portion in a plan view from a direction along the center axis.

8. The motor according to claim 6 , wherein the opening has an oval shape curved along the circumferential direction.

9. The motor according to claim 6 , wherein the notch is positioned at a center of the opening in the circumferential direction.

10. The motor according to claim 6 , wherein a circumferential width of the notch does not exceed a circumferential width of the opening.

11. The motor according to claim 1 , further comprising:

a rotor that rotates about the center axis; wherein

the shaft includes a threaded portion extending in the axial direction and a flange portion extending in the radial direction; and

a surface, close to the threaded portion, of the flange portion is a flat surface.

12. The motor according to claim 11 , wherein

the shaft includes a connecting portion that connects the threaded portion and the flange portion in the axial direction; and

the connecting portion includes a non-circular cross section perpendicular to the center axis.

13. The motor according to claim 11 , wherein the flange portion includes a holding portion, which holds a bearing rotating the rotor, on an outer circumferential surface.

14. A carrier vehicle equipped with the motor according to claim 6 , wherein the opening of the motor is positioned above the center axis.