JP2006340430A5 - - Google Patents

Claims (10)

Magnetizing coil inserts the annular magnet in a cylindrical magnetizing yoke provided in addition a current to the magnetizing coil, 2n in the annular magnet (n is an integer of 1 or more) form a number of poles In the magnetization method to
A magnetizing method of an annular magnet in which 2n magnetized columns made of a magnetic material having a circumferential width of 140 degrees or less in electrical angle are arranged opposite to the substantially central portion of the magnetic pole on the outer peripheral surface of the annular magnet. . The magnetization method according to claim 1, wherein the magnetized column has a substantially columnar shape or a sector shape . The deposition磁柱is magnetized method according to claim 1 or claim 2 is movable from the center of the magnetizing yoke in the radial direction. The magnetization method according to claim 3 , wherein the gap between the magnetized yoke and the annular magnet and the gap between the annular magnet and the magnetized column are reduced by moving the magnetized column . A cylindrical magnetized yoke having a magnetized coil wound and 2n (n is an integer of 1 or more) salient poles ;
In the circumferential range of the circumference in a direction substantially central portion of the following 140 degrees in electrical angles each salient pole portion of the magnetizing yoke, through the radial clearance for inserting arranged annular Ma Gunetto, An annular magnet magnetizing device in which magnetized columns made of a magnetic material are arranged around the magnetizing yoke . The magnetized pillars, substantially columnar or magnetizing device according to claim 5 which is a fan-shape. The magnetizing apparatus according to claim 5 or 6, wherein the magnetizing column is movable in a radial direction from a center of the magnetizing yoke. The magnetizing device according to claim 7, wherein the magnetized column is moved to reduce a gap between the magnetized yoke and the annular magnet and a gap between the annular magnet and the magnetized column. A brushless motor on which an annular magnet magnetized by the magnetizing method according to any one of claims 1 to 4 is mounted. A brushless motor on which an annular magnet magnetized by the magnetizing device according to any one of claims 5 to 8 is mounted.