Abstract
A permanent magnet synchronous motor (PMSM) has advantages in applications such as electric vehicles and all-electric-aircraft because of its inherent characteristics of high power density. In order to further improve its power density, this paper proposes a novel rotor structure with a magnetic stripe, based on the “dual stator + Halbach array” topology of the PMSM, which leads to a PMSM with greater power density. Then, this paper proposes characteristic parameters such as the external air gap proportional coefficient K1 and the internal air gap proportional coefficient K2 of the novel rotor structure, and establishes the torque analysis model of the novel rotor structure and the corresponding motor. Simulation results show that the novel rotor structure can increase the average torque. Then, this paper establishes an optimization model, in which K1 and K2 are taken as optimization variables, a torque fluctuation of no more than 5% is set as a constraint, and the maximum average torque is set as the optimization goal. The results show that the optimized novel rotor structure with magnetic stripe can significantly improve the torque performance of the PMSM, and the optimization method proposed is efficient.
Highlights
The permanent magnet synchronous motor (PMSM) is widely used in the electric vehicle industry due to its inherent characteristics of high power density [1]
Among the factors that affect the torque performance of the PMSM, the fundamental wave amplitude of the radial component of the air gap magnetic flux density is generally proportional to the output torque, and it has a strong relationship with the waveform and amplitude of the radial component of the air gap magnetic flux density
The maximum value Tmax in the corresponding value range can be obtained, when the feasible region X is taken as the definition domain, by the graphical method shown in Figure 10, in which the contours of average torque can be used to find the maximum value in the feasible region X, or by numerical method
Summary
The permanent magnet synchronous motor (PMSM) is widely used in the electric vehicle industry due to its inherent characteristics of high power density [1]. In order to further improve the air gap magnetic density amplitude or waveform, some scholars started from the air gap magnetic field source, that is the permanent magnets They divided the permanent magnets corresponding to each pole into several magnetic subassemblies, and optimized the structural parameters such as quantity and thickness of the permanent magnets, the circumferential span of the permanent magnets, and depth of the base, which improved the air gap flux density waveform formed by the permanent magnets and resulted in the HPM [16]. Other scholars started from the magnetic flux transmission path, reducing the magnetic resistance They kept the arrangement of the rotor permanent magnets unchanged, and installed a trapezoidal iron core structure on the side of the permanent magnet while retaining the air area between the poles, and optimized the parameters of the trapezoidal iron core structure, which improved the amplitude of the magnetic flux density formed in the air gap by the permanent magnets and resulted in an APM [17]. The rotor structure of the surface-mounted permanent magnet synchronous motor is taken as an example for simulation analysis and structural parameter optimization
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