| 摘要 |
An inner-rotor motor includes a shaft, a rotor magnet, a stator arranged radially outside of and opposite to the rotor magnet, and upper and lower brackets arranged to hold upper and lower bearings. The upper bracket includes an upper cylindrical cover press fitted to an outer circumference of a stator core from above, an upper bearing holding portion configured to hold the upper bearing, and a top plate portion arranged to join the upper cylindrical cover to the upper bearing holding portion. The lower bracket includes a lower cylindrical cover press fitted to the outer circumference of the stator core from below, a lower bearing holding portion arranged to hold the lower bearing, and a bottom plate portion arranged to join the lower cylindrical cover to the lower bearing holding portion. Each of the upper and lower brackets is fixed to the stator core through press fitting. |
| 主权项 |
1. An inner-rotor motor comprising:
an upper bearing and a lower bearing; a shaft supported by the upper and lower bearings to be rotatable about a rotation axis extending in a vertical direction; a rotor magnet directly or indirectly fixed to the shaft; a stator arranged radially outside of and opposite to the rotor magnet with a gap intervening therebetween; an upper bracket arranged to hold the upper bearing; and a lower bracket arranged to hold the lower bearing; wherein the stator includes a stator core, an insulator, and windings wound around the stator core with the insulator intervening therebetween; the upper bracket includes an upper cylindrical cover press fitted to an outer circumference of the stator core from above, an upper bearing holding portion arranged to extend in an axial direction and arranged to hold the upper bearing, and a top plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion to each other; the lower bracket includes a lower cylindrical cover press fitted to the outer circumference of the stator core from below, a lower bearing holding portion arranged to extend in the axial direction and arranged to hold the lower bearing, and a bottom plate portion arranged to join the lower cylindrical cover and the lower bearing holding portion to each other; at least one of the upper and lower bearings is an oil-impregnated sintered bearing; and each of the upper and lower brackets is fixed and press-fit to the stator core. |
