Centrifugal pump driven by U-shaped iron core single-phase permanent magnet synchronous motor

The utility model provides a centrifugal pump driven by a U-shaped iron core single-phase permanent magnet synchronous motor. The centrifugal pump driven by the U-shaped iron core single-phase permanent magnet synchronous motor comprises a pump cover, a centrifugal impeller and the U-shaped iron core single-phase permanent magnet synchronous motor, wherein the pump cover is provided with an axial suction inlet and a radial or tangential discharge outlet; a left pole shoe and a right pole shoe which are close to the cylindrical surface of the permanent magnet rotor are formed on the upper portions of two U-shaped arms of an iron core of the motor, pole arcs of the pole shoes are formed by connecting arcs which are different in radius and are coaxial with the rotor, the central angle corresponding to the first radius arc is phi b, the central angle corresponding to the second radius R large arc or the gradual change radius section curve is phi a, and phi b is a. The ratio of phi a to phi b is greater than or eq