Rotor and motor
A rotor includes a rotor core, a magnet, and a cover. The rotor core includes an annular portion and a plurality of magnetic pole pieces. The magnet is disposed between two magnetic pole pieces adjacent to each other in a circumferential direction of the plurality of magnetic pole pieces. The cover covers an outer peripheral portion of the magnet, and is formed of a non-magnetic member or a member having magnetism lower than magnetism of the rotor core.
1 . A rotor comprising:
a shaft including a first end portion and a second end portion; and
a rotor core including:
an annular portion; and
a plurality of magnetic pole pieces;
a magnet disposed between two magnetic pole pieces adjacent to each other in a circumferential direction of the plurality of magnetic pole pieces;
a cover including:
a planar portion;
a protruding portion protruding from the planar portion in an axial direction; and
an inner peripheral portion protruding directly from a first end portion side of the planar portion in the axial direction,
wherein the protruding portion of the cover covers an outer peripheral portion of the magnet in a radial direction,
wherein the inner peripheral portion of the cover is disposed between the annular portion and the shaft in a radial direction; and
the cover is formed of a non-magnetic material or a material having magnetism lower than magnetism of a material forming the magnetic pole pieces.
2 . The rotor according to claim 1 , wherein
the two adjacent magnetic pole pieces include recessed portions recessed in the radial direction.
3 . The rotor according to claim 2 , wherein
each of the recessed portions of the two adjacent magnetic pole pieces is opposed to the magnet in the circumferential direction.
4 . The rotor according to claim 1 , wherein
The cover includes an opening portion opening in an axial direction, and
the opening portion opposes the magnet in the axial direction.
5 . The rotor according to claim 1 , wherein
the rotor core includes a support portion protruding in the radial direction, and
the support portion and the magnet are in contact with each other.
6 . The rotor according to claim 1 , wherein
the cover includes a contact portion, and
the contact portion is in contact with the magnet at a radially inner side of the magnet.
7 . A motor comprising the rotor according to claim 1 .
8 . The rotor according to claim 1 , wherein a curved edge is formed between the inner peripheral portion and the first end portion side of the planar portion.