Minitype permanent-magnet synchronous motor adopting ''U''-shaped iron core and dewatering pump

Abstract

The invention discloses a minitype permanent-magnet synchronous motor adopting a ''U''-shaped iron core and a dewatering pump. The motor comprises a permanent-magnet rotor and a stator, wherein the permanent-magnet rotor is a cylinder of which two radial poles are magnetized; the stator comprises a ''U''-shaped stator iron core and a stator winding through which the iron core passes; the stator iron core comprises a pure ''U''-shaped pole body, a magnet yoke part, a left pole shoe and a right pole shoe, wherein the left pole shoe and the right pole shoe are formed on the upper parts of the two arms of the ''U''-shape; the pole surface of the left pole shoe is abutted against the left side of the cylindrical surface of the permanent-magnet rotor; and the pole surface of the right pole shoe is abutted against the right side of the cylindrical surface of the permanent-magnet rotor. The minitype permanent-magnet synchronous motor is characterized in that a plane on which the two pole horns of at least one pole shoe are positioned is intersectant with a symmetry axis of the ''U''-shape. The dewatering pump comprises the motor, a coaxial-transmission impeller thereof, a pump cover and a pump body, wherein the pump cover surrounds the impeller to perform the volute function, and the pump body is used for supporting the motor and the pump cover. The motor and the dewatering pump can be started by self even if non-uniform air gaps are not adopted. The problems of magnetic resistance and torque fluctuation due to the non-uniform air gaps can be eliminated, and the structural stability and the dimensional stability are improved.

Description

technical field [0001] The invention relates to a miniature permanent magnet synchronous motor and a drainage pump using a "U"-shaped iron core, in particular to the magnetic circuit structure of the motor. In the international patent classification table, the classification can belong to H02K21 / 12 and F04D13 / 06. Background technique [0002] The miniature permanent magnet synchronous motor using "U"-shaped (also known as "U-shaped", "U-shaped" or "tuning fork") iron core is a salient pole motor with simple structure, especially the assembly efficiency and the utilization rate of iron core punching very high. Its prior art sees following information: [0003] "Principle, Design and Application of Small Power Permanent Magnet Motor" published by Machinery Industry Press in 2009; [0004] "Permanent Magnet Motor" published by China Electric Power Publishing House in 2007; [0005] Harbin Institute of Technology Fu Min's 2005 doctoral dissertation "Mechanism and characterist...

AI Technical Summary

Problems solved by technology

However, while the non-uniform air gap provides the starting torque, it also reduces the running effect, mainly because the reluctance increases in the increasing section of the air gap, and the non-uniform air gap is bound to be accompanied by the fluctuation of the running torque, thus increasing the vibration and noise

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