Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles

Zheng, Ping; Wang, Weinan; Wang, Mingqiao; Liu, Yong; Fu, Zhenxing

doi:10.3390/en10122173

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…In recent times, interior permanent-magnet (IPM) machine has become a viable choice for traction and many other industrial applications due to its advantages of low loss [1], compact size [2], and wide constant power speed range (CPSR) [3]. Among various IPM machine rotor topologies, the spoke-type (I-type) rotors are known for their flux concentration capability from the magnets, which is beneficial for high torque density and high efficiency [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

et al. 2020

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This paper investigates the theoretical reasons behind the low torque ripple of a fractional-slot concentrated-winding (FSCW) spoke-type interior permanent-magnet (IPM) machine obtained via a genetic algorithm-based optimization. To better understand the torque performance of the IPMM, this paper uses the frozen permeability method to segregate the overall torque into four components—magnet torque, reluctance torque, cogging torque, and the torque caused by cross-magnetization. Equations and detailed procedures of the torque separation method are discussed in the paper. Analysis of the separated torque components reveals that the counteraction between ripples of different torques leads to the low torque ripple. At high-load conditions, the magnetic saturation alters the torque ripples caused by cross-magnetization to offset ripples of other components resulting in minimization of the overall torque ripple. A detailed parametric analysis of the geometric parameters was carried out to understand their effect in producing minimum torque ripple in the optimized design. In the end, a prototype was built and used for the verification of the torque separation method and the analytical findings based on it.

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Section: Introductionmentioning

confidence: 99%

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

et al. 2020

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“…The demand for Permanent Magnet Synchronous Machines (PMSM) is rapidly increasing in high-performance applications, such as electric vehicles [1][2][3][4], due to their high power density. In particular, the configuration of buried magnets inside the rotor is becoming very popular, because of the additional torque made available to saliency, their wide constant power speed region, and their high demagnetization withstand capability, among others [5,6].…”

Section: Introductionmentioning

confidence: 99%

Node Mapping Criterion for Highly Saturated Interior PMSMs Using Magnetic Reluctance Network

et al. 2018

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Interior Permanent Magnet Synchronous Machine (IPMSM) are high torque density machines that usually work under heavy load conditions, becoming magnetically saturated. To obtain properly their performance, this paper presents a node mapping criterion that ensure accurate results when calculating the performance of a highly saturated IPMSM via a novel magnetic reluctance network approach. For this purpose, a Magnetic Circuit Model (MCM) with variable discretization levels for the different geometrical domains is developed. The proposed MCM caters to V-shaped IPMSMs with variable magnet depth and angle between magnets. Its structure allows static and dynamic time stepping simulations to be performed by taking into account complex phenomena such as magnetic saturation, cross-coupling saturation effect and stator slotting effect. The results of the proposed model are compared to those obtained by Finite Element Method (FEM) for a number of IPMSMs obtaining excellent results. Finally, its accuracy is validated comparing the calculated performance with experimental results on a real prototype.

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Exact magnetic field analytical model for eccentric magnetic harmonic gears using hyperbolic cotangent transformation

Liu

Zhao

Sun

et al. 2020

IET Electric Power Applications

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The eccentric magnetic harmonic gear (EMHG) utilises the change of the magnetic permeability caused by eccentric structure to achieve large torque transmission with high gear ratios. This study presents an exact EMHG analytical model based on the hyperbolic cotangent transformation method. The exact method has no truncation errors and thus it is appropriate for the analysis of magnetic fields in the EMHG with large eccentricity. Firstly, the eccentric air‐gap magnetic field distributions are obtained by modulating the concentric magnetic field distributions with the relative permeance function. Then, the air‐gap flux density of the EMHG is obtained according to the superposition of the flux density by the eccentric rotor and stator permanent magnets acting alone. Furthermore, the analytical results of the air‐gap flux density and electromagnetic torque are compared with those of the finite‐element method, which verifies the correctness and validity of the analytical model. Finally, the experimental measurements on the dual‐stage EMHG confirm the validity of the analytical prediction.

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Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles

Cited by 5 publications

References 14 publications

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

Node Mapping Criterion for Highly Saturated Interior PMSMs Using Magnetic Reluctance Network

Exact magnetic field analytical model for eccentric magnetic harmonic gears using hyperbolic cotangent transformation

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