公开(公告)号：US20250038630A1

公开(公告)日：2025-01-30

申请号：US18912316

申请日：2024-10-10

Applicant: DENSO CORPORATION

Inventor： MASASHI MATSUDA ,  SATOSHI DOI

IPC: H02K15/03 ,  H01F13/00

Abstract: A manufacturing method of a field magnet device includes: an assembling process that includes assembling a plurality of magnets, which are prior to magnetization, to a magnetizer; a first magnetizing process that includes generating a magnetizing magnetic field from the magnetizer and magnetizing all of the magnets arranged in a circular ring form by using the magnetizing magnetic field; and a second magnetizing process that is executed after the first magnetizing process and includes generating a magnetizing magnetic field, which is stronger than the magnetizing magnetic field generated in the first magnetizing process, from the magnetizer, and sequentially magnetizing all of the magnets by using the magnetizing magnetic field generated in the second magnetizing process such that a predetermined number of magnets continuously arranged in a circumferential direction among the magnets are magnetized each time.