US 11,682,934 B2
Rotary electric machine with rotor having permanent magnets with ratios of total surface area and a stator with tooth having coils with offset from flange portions
Manabu Yazaki, Wako (JP); Shigeru Tajima, Wako (JP); Shoei Abe, Wako (JP); Yoshihisa Kubota, Wako (JP); and Sho Yaegaki, 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. 17/482,496.
Claims priority of application No. JP2020-163300 (JP), filed on Sep. 29, 2020.
Prior Publication US 2022/0103031 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H02K 1/27 (2022.01); H02K 1/2706 (2022.01); H02K 3/12 (2006.01); H02K 1/16 (2006.01)
CPC H02K 1/2706 (2013.01) [H02K 1/16 (2013.01); H02K 3/12 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotary electric machine, comprising:
a stator including a yoke portion configured in an annular shape, and a 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 in which an electromagnetic coil is provided in slots formed between adjacent ones of the teeth portions; and
a rotor configured to retain a plurality of permanent magnets facing toward the teeth portions,
wherein
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,
the teeth portions each include
a base portion configured to protrude from an inner circumferential edge part of the yoke portion in the radially inward direction of the yoke portion, and
a flange portion provided at a distal end of the base portion on an inner circumferential side, and configured to be wider than the base portion,
the electromagnetic coil is constituted by winding a wire material made of conductor around the teeth portions,
with respect to the electromagnetic coil constituted by having wound the wire material, a distal end position on an inner circumferential side of the electromagnetic coil inside the slots is offset from an inner circumferential side end part of the base portion toward the yoke portion, and
an offset amount of the electromagnetic coil is a distance from an inner circumferential side end part of the flange portion to the distal end position on the inner circumferential side of the electromagnetic coil and is 5% to 11% of a total length of any of the teeth portions.