INNER-ROTOR MOTOR

摘要

A motor includes a shaft supported by upper and lower bearings and rotatable about an axis; a rotor magnet fixed to the shaft; a stator arranged radially outside and opposite to the rotor magnet with a gap therebetween; an upper bracket holding the upper bearing; and a lower bracket holding the lower bearing. The upper bracket includes an upper cylindrical cover press fitted to a stator core from above, an upper bearing holding portion, and a top plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion. The lower bracket includes a lower cylindrical cover press fitted to the stator core from below, a lower bearing holding portion, and a bottom plate portion arranged to join the lower cylindrical cover and 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 and opposite to the rotor magnet with a gap intervening therebetween; an upper bracket configured to hold the upper bearing; and a lower bracket configured 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 extending in an axial direction and configured to hold the upper bearing, and a top plate portion configured 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 extending in the axial direction and configured to hold the lower bearing, and a bottom plate portion configured to join the lower cylindrical cover and the lower bearing holding portion to each other; and each of the upper and lower brackets is press fitted to the stator core.