US Patent 11177707 Motor rotor and permanent magnet motor

The present disclosure discloses a motor rotor and a permanent magnet motor. The motor rotor includes a rotor core and a plurality of magnetic poles in the rotor core. The magnetic pole includes a first, a second, and a third permanent magnets, and the size relationship of the first, the second and the third permanent magnets in the cross section of the rotor core meets m/2>H1*Hcj1*L1/[(H2*Hcj2*L2+½H3*Hcj2*L3)]>m/10, wherein m is a multiple of the motor flux adjustment range; L1 is the length of the first permanent magnet; H1 is the width of the first permanent magnet; Hcj1 is the intrinsic coercivity of the first permanent magnet; L2, H2 and Hcj2 are the length, the width and the intrinsic coercivity of the second permanent magnet, respectively; L3 H3, Hcj3 are the length, the width, and the intrinsic coercivity of the third permanent magnet, respectively.