To improve the electromagnetic performance of the interior U-shaped permanent magnet synchronous motor and reduce the vibration noise of the motor body, a magnet-focusing type equal volume misalignment segmented interior U-shaped permanent magnet synchronous motor is proposed. First, the electromagnetic performance expression of the motor such as gap magnetic flux density, no-load back-emf, and output torque, and the expression of electromagnetic vibration such as radial electromagnetic force, vibration velocity and acceleration are derived. Second, the effects of the separate addition of magnetic barrier structure, misalignment structure, and Halbach magnetization structure on the electromagnetic performance of the motor are investigated. Finally, the structure parameters are analyzed and optimized, and the electromagnetic performance, electromagnetic vibration, and noise fluctuation of 5 types of U-shaped magnet pole permanent magnet synchronous motors are compared. The study shows that the four added structures have a significant effect on motor performance. In terms of electromagnetic performance, the addition of a magnetic barrier, misalignment structure, and auxiliary can improve the motor output torque and reduce the slot torque. The Halbach magnetization can improve the output torque, radial air-gap magnetic flux density distribution, and radial electromagnetic force distribution, and combination of the three can improve the motor output torque. The output torque becomes more smooth, and the slot torque and torque ripple are significantly reduced. In terms of vibration noise, the auxiliary slot structure is added to significantly suppress the 8th and 16th harmonic amplitude of the radial electromagnetic force; the magnetic barrier structure can suppress the low-frequency vibration of the motor, and the misalignment structure and Halbach magnetization can suppress the high-frequency vibration acceleration of the motor, and the four structures can significantly reduce the radial electromagnetic force the space of 8 and 16 times, and the vibration acceleration of 4 times and 6 times in time is significantly suppressed, the maximum sound pressure level and mechanical of the motor meet the requirements of motor operation, and the rotor sample of the permanent magnet motor is machined.