公开(公告)号：US20220173628A1

公开(公告)日：2022-06-02

申请号：US17442621

申请日：2020-01-10

Applicant: NIDEC CORPORATION

Inventor： Junya TANAKA

IPC: H02K1/2783 ,  H02K11/215 ,  H02K21/16

Abstract: A motor includes a rotor magnet, a stator, and a magnetic sensor. The rotor magnet includes magnetized portions in a Halbach array, and having radially magnetized portions whose magnetization direction is a radial direction and non-radially magnetized portions. In first and second radially magnetized portions, magnetic poles on both sides in the radial direction are arranged opposite to magnetic poles on both sides in the radial direction of the first radially magnetized portion. The first and second radially magnetized portions are alternately arranged along a circumferential direction with at least one non-radially magnetized portion therebetween. The magnetic sensor is located on the other side in the radial direction with respect to the rotor magnet. A non-magnetized portion is in an axial portion of the rotor magnet where a magnetic field is detected by the magnetic sensor, and located between the first and second radially magnetized portions in the circumferential direction.

公开(公告)号：US20220181954A1

公开(公告)日：2022-06-09

申请号：US17598297

申请日：2020-01-10

Applicant: NIDEC CORPORATION

Inventor： Junya TANAKA ,  Tomoya UEDA

IPC: H02K15/03 ,  H02K1/2713

Abstract: One aspect of a method of manufacturing a rotor of the present invention is the method of manufacturing the rotor, which includes a rotor core rotatable about a central axis and a rotor magnet fixed to an outer peripheral surface of the rotor core, the method including a magnetization step of magnetizing a first magnetic member fixed to the outer peripheral surface of the rotor core to form the rotor magnet. The rotor core has a hole recessed from a surface on one side in an axial direction of the rotor core to the other side in the axial direction. In the magnetization step, the first magnetic member is magnetized in a state where a second magnetic member made of a magnetic material is inserted into the hole.

公开(公告)号：US20220181932A1

公开(公告)日：2022-06-09

申请号：US17598296

申请日：2020-01-10

Applicant: NIDEC CORPORATION

Inventor： Junya TANAKA ,  Tomoya UEDA

IPC: H02K1/2792 ,  H02K15/03 ,  H02K1/24

Abstract: One aspect of a rotor of the present invention includes: a rotor core rotatable about a central axis; and a rotor magnet fixed to an outer peripheral surface of the rotor core. The rotor magnet has a plurality of magnetized portions arranged along a circumferential direction in a Halbach array. The plurality of magnetized portions include a plurality of radially magnetized portions whose magnetization direction is a radial direction and a plurality of non-radially magnetized portions whose magnetization direction is different from the radial direction. The rotor core is a non-magnetic member that has a hole, recessed from a surface on one side in an axial direction of the rotor core to the other side in the axial direction and is made of a non-magnetic material. The hole is located on the radially inner side of the radially magnetized portion.