Steel sheet for rotor core for ipm motor, and method for manufacturing same
AssigneeNisshin Steel Co., Ltd.
InventorsTomonaga Iwatsu, Yukio Katagiri, Susumu Fujiwara, Akito Kawamoto
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Abstract
The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present, invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum, rotational speed.
Claims17
A steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m and a residual magnetic flux density Br of 0.5 T or more as measured at that time.
A method for manufacturing a steel sheet for a rotor core for an IPM motor, which has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m and a residual magnetic flux density Br of 0.5 T or more as measured at that time, wherein a hot-rolled steel sheet having a composition consisting of C:
- more than 0.0005% by mass to 0.90% by mass, Si:
- 0% by mass to 3.0% by mass, Mn:
- 0% by mass to 2.5% by mass, P:
- 0.05% by mass or less, S:
- 0.02% by mass or less, acid-soluble Al:
- 0.005% by mass to 3.0% by mass, and Si+Al:
- 5.0% by mass or less, with a balance of Fe and inevitable impurities, is cold rolled at a final reduction of 10% or more and then heated to a temperature of 200° C. to 500° C., or cold rolled once, or cold rolled two or more times with an intermediate annealing, at a final reduction of 3% or more.
Dependencies are inferred from the claim text.