	US 12,451,737 B2
	Rotating electrical machine, stator core and rotor core set, method for manufacturing rotating electrical machine, method for manufacturing non-oriented electrical steel sheet for stator and non-oriented electrical steel sheet for rotor, method for manufacturing stator and rotor, and non-oriented electrical steel sheet set
Tesshu Murakawa, Tokyo (JP); and Yoshiaki Natori, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/278,761
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Mar. 30, 2022, PCT No. PCT/JP2022/016049 § 371(c)(1), (2) Date Aug. 24, 2023, PCT Pub. No. WO2022/210895, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-061620 (JP), filed on Mar. 31, 2021; and application No. 2021-094807 (JP), filed on Jun. 4, 2021.
Prior Publication US 2024/0154472 A1, May 9, 2024
Int. Cl. H02K 1/02 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/34 (2006.01); C22C 38/60 (2006.01); H01F 1/147 (2006.01); H01F 41/02 (2006.01)

CPC H02K 1/02 (2013.01) [C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1261 (2013.01); C21D 8/1277 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/34 (2013.01); C22C 38/60 (2013.01); H01F 1/14783 (2013.01); H01F 41/02 (2013.01); C22C 2202/02 (2013.01)]

24 Claims

1. A rotating electrical machine comprising:

a stator;

a rotor; and

a casing that accommodates the stator and the rotor,

wherein at least one of

Condition 1: a thermal conductivity A of a non-oriented electrical steel sheet that is used for a core of the stator is in a range of 12 to 35 W/(m·K), a thermal conductivity B of a non-oriented electrical steel sheet that is used for a core of the rotor is in a range of 10 to 33 W/(m·K), and both the thermal conductivities have a relationship of an expression (1) of A>B, and

Condition 2: a thermal diffusivity Al of the non-oriented electrical steel sheet that is used for the core of the stator is in a range of 3.0×10⁻⁶to 9.0×10⁻⁶m²/sW/(m·K), a thermal diffusivity B1 of the non-oriented electrical steel sheet that is used for the core of the rotor is in a range of 2.5×10⁻⁶to 8.5×10⁻⁶m²/sW/(m·K), and both the thermal diffusivities have a relationship of an expression (3) of A1>B1

is satisfied,

a chemical composition of each of the non-oriented electrical steel sheets that are used for the core of the stator and the core of the rotor includes, by mass %,

C: 0.0100% or less,

Si: 2.6% or more and 4.5% or less,

Mn: 0.1% or more and 3.0% or less,

P: 0.15% or less,

S: 0.0030% or less,

N: 0.0040% or less,

Al: 0.1% or more and 2.0% or less,

one or more selected from Sn and Sb: 0% to 0.200%,

Cr: 0% to 0.400%,

Ni: 0% to 5.0%,

Cu: 0% to 5.0%,

Ca: 0% to 0.010%,

Mg: 0% to 0.0100%,

a rare earth element (REM): 0% to 0.010%,

B: 0% to 0.0050%,

Ti: 0.0030% or less,

O: 0.0200% or less, and

a remainder consisting of Fe and impurities, and

wherein a value of an expression (2) below for the non-oriented electrical steel sheet that is used for the core of the stator is lower than a value of the expression (2) for the non-oriented electrical steel sheet that is used for the core of the rotor

9.9+12.4×Si(mass %)+6.6×Mn(mass %)+10.0×Al(mass %) Expression (2).