Abstract
This paper presents an analytical method for predicting the electromagnetic performance in permanent magnet (PM) machine with the spoke-type rotor (STR) and a proposed hybrid rotor structure (HRS), respectively. The key of this method is to combine magnetic field analysis model (MFAM) with the magnetic equivalent circuit model. The influence of the irregular PM shape is considered by the segmentation calculation. To obtain the boundary condition in the MFAM, respectively, two equivalent methods on the rotor side are proposed. In the STR, the average flux density of the rotor core outer-surface is calculated to solve the Laplace's equation with considering for the rotor core outer-surface eccentric. In the HRS, based on the Thevenin's theorem, the equivalent parameters of PM remanence BreB and thickness hpme are obtained as a given condition, which can be utilized to compute the air-gap flux density by conventional classic magnetic field analysis model of surface-mounted PMs with air-gap region. Finally, the proposed analytical models are verified by the finite element analysis (FEA) with comparisons of the air-gap flux density, flux linkage, back-EMF and electromagnetic torque, respectively. Furthermore, the performance that the machine with the proposed hybrid structure rotor can improve the torque density as explained.
Highlights
Interior permanent magnet synchronous machine (IPMSM) has been widely applied to the electric vehicles (EVs) field and aerospace industry all over the world, in view of the excellent performances of high-power density, high efficiency, and high reliability [1]–[5]
Liu et al.: Analytical Model of Torque-Prediction for a Novel Hybrid Rotor PM Machines performances compared with the finite element analysis (FEA)
This paper presents an analytical method for the PM machine with non-ideal regular shape rotor structure, which considers the rotor core outer-surface eccentric and the proposed hybrid rotor structure, respectively
Summary
Interior permanent magnet synchronous machine (IPMSM) has been widely applied to the electric vehicles (EVs) field and aerospace industry all over the world, in view of the excellent performances of high-power density, high efficiency, and high reliability [1]–[5]. To further improve the torque density, the spoke-type PM machines has been adopted due to the advantage of the flux concentrated structure [6]–[8]. Liu et al.: Analytical Model of Torque-Prediction for a Novel Hybrid Rotor PM Machines performances compared with the FEA. In [22], it presents an improved analytical method for the surface mounted PM machines accounting for any eccentric rotor shape by the equivalent surface current of magnet pole. The proposed hybrid rotor structure can improve torque density due to increasing the magnetic flux area of IPMSMs and the equivalent thickness of the PM.
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