	US 12,283,846 B2
	Stator core, rotary electric machine, and design method for stator core
Yasuo Ohsugi, Tokyo (JP); Miho Tomita, Tokyo (JP); and Tesshu Murakawa, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/776,441
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Nov. 13, 2020, PCT No. PCT/JP2020/042473 § 371(c)(1), (2) Date May 12, 2022, PCT Pub. No. WO2021/095861, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-206649 (JP), filed on Nov. 15, 2019.
Prior Publication US 2022/0407371 A1, Dec. 22, 2022
Int. Cl. H02K 1/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/10 (2006.01); C22C 38/16 (2006.01); G06F 30/36 (2020.01); H02K 1/16 (2006.01)

CPC H02K 1/165 (2013.01) [C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/105 (2013.01); C22C 38/16 (2013.01); G06F 30/36 (2020.01); H02K 1/02 (2013.01); C22C 2202/02 (2013.01)]

18 Claims

1. A stator core comprising:

a plurality of laminated electrical steel sheets,

wherein, among a plurality of teeth of the stator core, widths of teeth along a direction in which magnetic characteristics are high are narrower than widths of teeth along a direction in which the magnetic characteristics are low,

wherein the stator core is configured by laminating rolled electrical steel sheets,

the electrical steel sheet has

a chemical composition containing, by mass %,

C: 0.0100% or less,

Si: 1.50% to 4.00%,

sol. Al: 0.0001% to 1.0%,

S: 0.0100% or less,

N: 0.0100% or less,

one or more selected from Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total,

Sn: 0.000% to 0.400%,

Sb: 0.000% to 0.400%

P: 0.000% to 0.400%, and

one or more selected from Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn and Cd: 0.0000% to 0.0100% in total are contained,

in which, when a Mn content (mass %) is indicated by (Mn), a Ni content (mass %) is indicated by (Ni), a Co content (mass %) is indicated by (Co), a Pt content (mass %) is indicated by (Pt), a Pb content (mass %) is indicated by (Pb), a Cu content (mass %) is indicated by (Cu), an Au content (mass %) is indicated by (Au), a Si content (mass %) is indicated by (Si), and a sol. Al content (mass %) is indicated by (sol. Al), Formula (1) below is satisfied, and

a remainder includes Fe and impurities,

when a value of B50 in a rolling direction is indicated by B50L, a value of B50 in a direction inclined by 45° from the rolling direction is indicated by B50D1, a value of B50 in a direction inclined by 90° from the rolling direction is indicated by B50C, and a value of B50 in a direction inclined by 135° from the rolling direction is indicated by B50D2, Formula (2) and Formula (3) below are satisfied, an X-ray random intensity ratio in {100}<011> is 5 or more and less than 30, and a sheet thickness is 0.50 mm or less,

the direction in which the magnetic characteristics are high is a direction at an angle of 45° from the rolling direction, and the direction in which the magnetic characteristics are low is directions at angle of 0° and 90° from the rolling direction, and

widths of teeth along a direction at an angle of 45° from the rolling direction are narrower than widths of teeth along a direction at an angle of 0° from the rolling direction and widths of teeth along a direction at an angle of 90° from the rolling direction,

((Mn)+(Ni)+(Co)+(Pt)+(Pb)+(Cu)+(Au))−((Si)+(sol.Al))>0% (1),

(B50D1+B50D2)/2>1.7T (2) and

(B50D1+B50D2)/2>(B50L+B50C)/2 (3).