Magnetization and performance analysis of a variable-flux flux-intensifying interior permanent magnet machine

Sun, Afang; Jian, Li; Qu, Ronghai; Zhao, Bo; Li, Dawei; Fang, Haiyang; Sun, Yingnan

doi:10.1109/iemdc.2015.7409086

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…Zhu et al [37] show that two 5 kW VFI-IPM motor types achieve a maximum speed of 6900 rpm and 7500 rpm while a conventional machine achieves only 5000 rpm speed. Sun et al [14] demonstrate that with the manipulation of the magnetization of a VFI-IPM machine, the speed is extended from 4000 rpm to 12000 rpm while also maintaining a 94% efficiency in the upper-speed range. Zhu et al of [37] also show that an excessive increase of q-axis flux barriers will lead to saturation of the d-axis flux path, which in turn affects the output torque.…”

Section: B Variable-flux Flux-intensifying Interior Permanent Magnet (Vfi-ipm) Machinesmentioning

confidence: 99%

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

2019

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Modern applications demand challenging operation requirements from electrical machines. Variable-flux machine (VFM) concepts are found to offer new opportunities for improved machine design. This paper reviews the VFM technology. Three topologies, mainly the parallel hybrid VFMs, series hybrid VFMs, and variable-flux flux intensifying type VFMs are discussed in detail. The variable-flux flux Intensifying machines are found to be the state-of-the-art VFM technology available to-date. The paper also reviews the magnetization process in the VFMs and relates this with the B-H curve of the magnetic material. The conventional PM machine mathematical model is adapted to represent the operation of the VFMs. The different operational limitations of the VFMs are explained and the different modes of operation of the VFMs have been reviewed and compared. The magnetization state manipulation techniques are reviewed. The AC magnetization is found to be the more preferable approach to reduce weight and manufacturing complexity of the VFMs. The trapezoidal current pulse based approach is popular in AC magnetization state manipulation, however, new advanced forms of current vector trajectory control techniques offer comparatively better magnetic state manipulation and higher speed capability for remagnetization of the magnets in the VFMs. The paper also reviews the different magnetization state estimation techniques that are useful during control systems development for the VFMs. The magnetic material for the VFM design is reviewed and potential alternative magnetic material that can satisfy the requirements of the VFMs have been identified. Finally, the current status, challenges, and the potential of VFMs technology are discussed in the conclusion of the paper.INDEX TERMS Variable flux machines, wide speed range, permanent magnet machines, field weakening, magnetic material, magnetization, demagnetization, machine design.

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Section: B Variable-flux Flux-intensifying Interior Permanent Magnet (Vfi-ipm) Machinesmentioning

confidence: 99%

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

2019

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“…Various topology motors have been proposed by domestic and foreign scholars [5][6], and the University of Wisconsin-Madison proposed an adjustable flux motor with AC axis reluctance enhancement and an axial flux adjustable motor [7][8]. References [9][10][11] proposed a series of adjustable parallel flux machines, and references [12][13] introduced the concept of memory motors to stator permanent magnet motors and proposed a biconvex adjustable flux motor. References [14][15] proposed a variety of series-parallel hybrid adjustable flux motors.…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of intelligent variable flux built-in permanent magnet synchronous motor

2024

jeeem

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In view of the existing variable flux permanent magnet synchronous motor with limited range of magnetization and no automatic control of magnetization accuracy, an intelligent variable flux permanent magnet synchronous motor with auto-rotating permanent magnets and rotor built-in drive controller (IVFPMSM) is proposed. This paper analyzes the internal structure design and operation principle of this intelligent variable flux permanent magnet synchronous motor (IVFPMSM), and numerically analyzes the electromagnetic characteristics such as induced electric potential, winding magnetic chain, air gap flux density and weak magnetic characteristics when the permanent magnets (PMs) rotate at 0°, 30°, 45° and 90°, respectively. The results show that the PM can be rotated at any angle under the composite drive, which greatly widens the range of motor magnetization. The validity of the theory and design is verified by making a prototype and building a test platform.

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“…To realize the characteristic of L d > L q , the primary method is to increase L d and reduce L q . A few methods are briefly described below: the first method, to achieve the characteristic, adopts design multiple flux barriers on the q-axis rotor topology [15][16][17], and the method can greatly reduce L q , but it will affect the mechanical strength and torque ripple of the motor [18]; the second method is to use the q-axis barriers and magnetic bridges to reduce L q and increase L d [14], and the method can realize preferable flux-intensifying effect; the third method is to adopt a nonuniform air-gap on the surface of the rotor [19,20], so the magnetic reluctance air barrier is added to the q axis magnet path to reduce L q . Compared to other methods, the third method is easier to realize L d > L q and can obtain better fluxintensifying effect and torque characteristics, so the method is applied to the proposed motor.…”

Section: Introductionmentioning

confidence: 99%

Comparative Design and Analysis of a New Type of Mechanical-Variable-Flux Flux-Intensifying Interior Permanent Magnet Motor

Liu¹,

Guo²,

Zhu³

et al. 2021

PIER C

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In this paper, a novel mechanical-variable-flux flux-intensifying interior permanent magnet (MVF-FI-IPM) motor is proposed, which employs a mechanical flux-adjusting device and owns the characteristic of L d > L q . The magnetic poles can be rotated by the mechanical device to vary the leakage flux and adjust the angle of magnetization direction relative to the d-axis. The characteristic of L d > L q is achieved through the adoption of surface flux barriers. The topology structure and operation principle of the machine are introduced. Then, the operation of the mechanical flux-adjusting device is analyzed by virtual prototype technology. Based on the two-dimensional finite element method (FEM), the electromagnetic characteristics of the proposed motor and FI-IPM motor are compared. Finally, the results show the proposed motor with a better flux-weakening capability and a lower risk of irreversible demagnetization than that of the FI-IPM motor.

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Magnetization and performance analysis of a variable-flux flux-intensifying interior permanent magnet machine

Cited by 11 publications

References 14 publications

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

Design and performance analysis of intelligent variable flux built-in permanent magnet synchronous motor

Comparative Design and Analysis of a New Type of Mechanical-Variable-Flux Flux-Intensifying Interior Permanent Magnet Motor

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