US 12,266,990 B2
Axial gap motor with curved rotor and stator cores
Keiu Kanada, Miyoshi (JP); Kazuaki Haga, Toyota (JP); Toshimitsu Takahashi, Toyota (JP); Mayumi Takazawa, Okazaki (JP); Takuya Nomura, Kasugai (JP); Shinya Sano, Toyota (JP); Takeshi Tomonaga, Nisshin (JP); Hisanori Koma, Miyoshi (JP); Yasuhide Yagyu, Nagakute (JP); Kensuke Komori, Toyota (JP); Tatsuhiko Hirano, Toyota (JP); Masaaki Ito, Anjo (JP); and Hiroaki Wakimoto, Nagoya (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jun. 8, 2023, as Appl. No. 18/331,371.
Application 18/331,371 is a continuation of application No. 17/227,653, filed on Apr. 12, 2021, granted, now 11,711,004.
Claims priority of application No. 2020-073864 (JP), filed on Apr. 17, 2020; application No. 2020-122246 (JP), filed on Jul. 16, 2020; and application No. 2021-022700 (JP), filed on Feb. 16, 2021.
Prior Publication US 2023/0318423 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02K 21/24 (2006.01); H02K 1/18 (2006.01); H02K 1/2793 (2022.01); H02K 1/2796 (2022.01); H02K 1/28 (2006.01)
CPC H02K 21/24 (2013.01) [H02K 1/182 (2013.01); H02K 1/2793 (2013.01); H02K 1/2796 (2022.01); H02K 1/28 (2013.01); H02K 2213/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An axial gap motor comprising a rotor fixed to a rotary shaft, and a stator opposed to the rotor in an axial direction of the rotary shaft with a gap provided between the stator and the rotor, wherein:
the rotor includes a plurality of rotor cores arranged in a circumferential direction;
the stator includes a plurality of stator cores arranged in a circumferential direction, and coils wound around the stator cores;
each of the rotor cores has a first end face and a second end face;
the rotor cores are curved, such that the first end face and the second end face face in the same direction;
each of the stator cores has a third end face and a fourth end face;
the stator cores are curved, such that the third end face and the fourth end face face in the same direction;
the first end face and the second end face of each of the rotor cores and the third end face and the fourth end face of each of the stator cores are in exposed states;
the first end face and the second end face of each of the rotor cores are respectively opposed to the third end face and the fourth end face of a corresponding one of the stator cores;
each of the stator cores has a first inner face and a second inner face that are opposed to each other and are provided continuously with the third end face and the fourth end face, respectively; and
Lg is a distance between the first end face of each of the rotor cores and the third end face of each of the stator cores, Sr is an area of the first end face of each of the rotor cores, Wsc is a distance between the first inner face and the second inner face of each of the stator cores, and Ss is an area of the first inner face of each of the stator cores, Wsc/(2*Lg)≥20, Sr/Ss≥0.2 are satisfied.