US 11,682,935 B2
Rotary electric machine with rotor having permanent magnets with ratios of total surface area and a stator with tooth having wide ends
Manabu Yazaki, Wako (JP); Yoshihisa Kubota, Wako (JP); Shoei Abe, Wako (JP); Sho Yaegaki, Wako (JP); and Shigeru Tajima, Wako (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Sep. 23, 2021, as Appl. No. 17/482,498.
Claims priority of application No. JP2020-163295 (JP), filed on Sep. 29, 2020.
Prior Publication US 2022/0103032 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02K 1/276 (2022.01); H02K 1/14 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/146 (2013.01); H02K 2213/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rotary electric machine, comprising:
a stator including a stator core including a plurality of teeth portions; and
a rotor configured to retain a plurality of permanent magnets facing toward the teeth portions,
wherein
the stator core includes
a yoke portion configured in an annular shape,
the plurality of teeth portions configured to protrude from a circumferential edge part of the yoke portion in a radial direction of the yoke portion, and
a slot formed between adjacent ones of the teeth portions,
the stator includes an electromagnetic coil provided in the slots,
the plurality of permanent magnets are configured to include a same number of
a first magnet in which a magnetic field of the first magnet is oriented in a radially outward direction of the yoke portion,
a second magnet adjacent to the first magnet and in which a magnetic field of the second magnet is oriented in a clockwise direction of the yoke portion,
a third magnet adjacent to the first magnet and in which a magnetic field of the third magnet is oriented in a counterclockwise direction of the yoke portion, and
a fourth magnet adjacent to the third magnet and in which a magnetic field of the fourth magnet is oriented in a radially inward direction of the yoke portion,
an outer diameter of the stator core is set to 115 mm to 130 mm,
a total length of the teeth portions lies within a range 40 mm to 45 mm, and
when the plurality of permanent magnets are viewed in plan from above or below, a ratio of a total surface area of the first magnet and the fourth magnet to a total surface area of the second magnet and the third magnet is 1:0.2 to 1:1.