公开(公告)号：US20180159407A1

公开(公告)日：2018-06-07

申请号：US15891916

申请日：2018-02-08

Applicant: MINEBEA MITSUMI Inc.

Inventor： Fumitoshi YAMASHITA ,  Osamu YAMADA ,  Shiho OHYA ,  Akihiro YAMANE

IPC: H02K15/03 ,  H02K1/27 ,  H02K1/02

CPC classification number: H02K15/03 ,  H02K1/02 ,  H02K1/278 ,  H02K29/03 ,  H02K2201/03 ,  H02K2213/03

Abstract: A motor includes poles P having a remanence Mr of 0.9 T or more, a coercivity HcJ of 0.80 MA/m or more, and a maximum energy product (BH)max of 150 kJ/m3 or more, which sets a center point Pc of the magnetic poles in a circumferential direction on a rotor outer circumferential surface to a maximum thickness tmax, wherein when a line connecting the Pc and a rotational axis center Rc is Pc-Rc, a straight line connecting an arbitrary point Px in the circumferential direction on the rotor outer circumferential surface and the Rc is Px-Rc, an apex angle of the lines Pc-Rc and Px-Rc is θ, a number of pole pairs is Pn, a circumferential direction magnetic pole end is Pe, and a magnetic pole end biasing distance ΔLPe of the circumferential direction magnetic pole ends Pe is α×tmax (α is a coefficient).