| 摘要 |
A pump driven by an outer rotor 40 and having an annular ferrite magnet 50 which may have grain alignment on its inner periphery comprising a housing 10, a pump rotor 20, a stator 30 and an outer rotor 40 surrounding the stator 30,. The pump is characterized in that: the rotor includes a rotating disk 41 and the annular ferrite magnet 50 fixed on the inner periphery of the disk, the main body of the annular magnet is divided into a magnetic permeable outer layer 51 which is not magnetic and a magnetized inner layer 52 thereby to shorten the magnetic loops, and to increase magnetic force and the effect of magnetic energy accumulation and the magnet may be a multipolar anisotropic permanent magnet,. An isolation chamber 14 contains the stator and Hall sensor 33, the rotor being external or internal to this chamber such that the pump rotor may be either integral with the motor rotor or separate there from, being driven by a shaft passing though housing 14. |
