US 12,266,977 B2
Rotor and electric motor
Kenta Suzuki, Osaka (JP); Eiki Morimoto, Osaka (JP); Hajime Ukaji, Aichi (JP); Toshiyuki Tamamura, Osaka (JP); and Noritaka Aso, Kyoto (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/995,654
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 8, 2021, PCT No. PCT/JP2021/004500
§ 371(c)(1), (2) Date Oct. 6, 2022,
PCT Pub. No. WO2021/210249, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-072707 (JP), filed on Apr. 15, 2020.
Prior Publication US 2023/0117552 A1, Apr. 20, 2023
Int. Cl. H02K 1/276 (2022.01); H02K 1/16 (2006.01); H02K 1/28 (2006.01)
CPC H02K 1/2766 (2013.01) [H02K 1/16 (2013.01); H02K 1/28 (2013.01); H02K 2213/03 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A rotor comprising:
an iron core including a plurality of first holes and a plurality of second holes;
a plurality of first permanent magnets arranged in the plurality of first holes, respectively; and
a rotating shaft fixed to the iron core, wherein:
the plurality of first holes and the plurality of second holes are provided radially around the rotating shaft,
each of the plurality of first holes extends in a radial direction of the iron core,
each of the plurality of second holes has a length in the radial direction of the iron core, and the length being smaller than a length of each of the plurality of first holes in the radial direction of the iron core,
each of the plurality of second holes is located closer to an inner side in the radial direction of the iron core with respect to a first hole adjacent to the second hole in a circumferential direction of the iron core among the plurality of first holes, and includes a protrusion protruding toward the first hole adjacent to the second hole in the circumferential direction of the iron core,
in a second hole among the plurality of second holes, a side of the second hole facing the first hole includes a first side opposed to one side of the first hole, a second side and a third side, and
an angle formed by the first side and the one side of the first hole is in a range from −5° to 5° inclusive, the second side extends from an end of the first side toward inside the second hole and the third side extends from an end of the second side in the radial direction.