A Novel Variable-Flux Permanent-Magnet Synchronous Machine With Quasi-Series Magnet Configuration and Passive Flux Barrier

Zhang, Shukuan; Zheng, Ping; Jahns, T.M.; Cheng, Luming; Wang, Mingqiao; Sui, Yi

doi:10.1109/tmag.2018.2844824

Cited by 31 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The parallel-type hybrid PMs have a wide flux regulation range, but there is a risk of accidental demagnetization due to the demagnetization MMF of the HCF PM to the LCF PM (Wei and Nakamura, 2020; Qin et al , 2021). The performance of the hybrid magnetic circuit type machines lies between the two, but the use of two groups of magnetic circuits leads to structural complexity and reduces design flexibility (Zhang et al , 2018; Qiao et al , 2021; Yang et al , 2020).…”

Section: Introductionmentioning

confidence: 99%

Development and comparison of double-stator memory machines with parallel hybrid magnets

Peng,

Cheng,

Zhang

et al. 2023

COMPEL

View full text Add to dashboard Cite

Purpose This paper aims to further develop stator permanent magnet (PM) type memory machines by providing generalized design guidelines for double-stator memory machines (DSMMs) with hybrid PMs. This paper discusses the design experience of DSMMs and presents a comparative study of radial magnetization (RM) and circumferential magnetization (CM) types. Design/methodology/approach It begins with an introduction to RM and CM operating principles and magnetization mechanisms. Then, a comparative study is conducted for one of the RM-DSMM rotor pole pairs, inner and outer stator clamping angles and low coercive force PMs thickness. Finally, the two machines’ finite element simulation performance is compared. The validity of the proposed machine structure is demonstrated. Findings In this paper, the double-stator structure is extended to parallel hybrid PM memory machines, and two novel DSMMs with RM and CM configurations are proposed. Two types of DSMMs have PMs and magnetizing windings on the inner stator and armature windings on the outer stator. The main difference between the two is the arrangement of PMs on the inner stator. Originality/value Conventional stator PM memory machines have geometrical space conflicts between the PM and armature windings. The proposed double-stator structure can alleviate these conflicts and increase the torque density accordingly. In addition, this paper contributes to comparing the arrangement of hybrid PMs for DSMMs.

show abstract

Section: Introductionmentioning

confidence: 99%

Development and comparison of double-stator memory machines with parallel hybrid magnets

Peng,

Cheng,

Zhang

et al. 2023

COMPEL

View full text Add to dashboard Cite

show abstract

“…The VFMs often possess a relatively low torque density due to the utilization of LCF magnets. To improve this, a hybrid permanent magnet variable flux motor (HPM-VFM) combining high coercive force (HCF) magnets and LCF magnets was proposed [23][24][25][26][27][28][29][30][31][32][33][34][35]. Regulation of air-gap flux density in HPM-VFM can be achieved by applying a pulse current whose copper loss is considered negligible.…”

Section: Introductionmentioning

confidence: 99%

“…The HPM-VFM can also maintain high torque and high power density, almost equivalent to general PMSMs. Due to these advantages, various rotor topologies have been developed, the most typical of which are series [23,[25][26][27][28] and parallel [29,30] HPM-VFMs. These two types of rotor topologies possess their own strengths and weaknesses.…”

Section: Introductionmentioning

confidence: 99%

A Novel Variable Flux Spoke Type Permanent Magnet Motor With Swiveling Magnetization for Electric Vehicles

2022

View full text Add to dashboard Cite

This article proposes a novel variable-flux spoke-type permanent magnet synchronous motor (VFS-PMSM), whose air gap flux density can be adjusted by "swiveling" magnetic pole directions in permanent magnet (PM). This is distinctive from conventional methods that require a large magnetizing field to magnetize and demagnetize (or partially) rotor PM along the same axis for variable flux motors. This paper first compares the proposed VFS-PMSM with two other typical types, i.e., series and parallel arrangements combining high-and low-coercivity PMs to achieve variable flux. It is found that the magnetic circuit of the proposed motor is identical to that of the series type at flux enhancing and to that of the parallel type at flux weakening. Therefore, the wide flux regulation range of the parallel type motors and the excellent on-load demagnetization-resisting capability of the series type motors can both be achieved in the proposed design. Another benefit of the proposed design is that the flux produced by the low-coercivity magnet constantly or aligns with that produced by the high-coercivity one whether the motor is flux enhanced or weakened. This allows the low-coercivity magnet to maintain its operating point within a safe range. These features make the proposed design suitable for electric vehicle tractions. Finite element analysis is used to compare the performance of various types of motors and highlight the advantages of the proposed VFS-PMSM. Experiments are conducted to validate the feasibility of the low-coercivity magnet to be magnetized with the method proposed in this paper. It is found that the field strength to magnetize or demagnetize the rotor can be significantly reduced, which improves the feasibility of this design.INDEX TERMS Electric vehicle, variable flux motor, magnetization, spoke type, permanent magnet synchronous motor.

show abstract

“…Hua et al compared the series and parallel types of H-VFMs and revealed that the operating point of the LCF magnet in the parallel type is unstable [26]. To have a stable operation of the LCF magnet and excellent flux regulation ability, a variable-flux permanent-magnet synchronous machine with a quasi-series magnet configuration and passive flux barrier was proposed [27,28]; however, the problem of a large magnetizing current to switch from flux enhancing to weakening is yet to be resolved. Yang et al proposed a hybrid-magnet-circuit VFM [29][30][31] that combines the advantages of both types of H-VFMs mentioned above to achieve high torque density, good flux adjustment ability, and reduce magnetizing currents.…”

Section: Introductionmentioning

confidence: 99%

“…To simultaneously achieve the above-mentioned advantages, i.e., high torque density, excellent flux regulation ability, low demagnetization risk, low magnetizing impulse current demand, high efficiency at high speed, and expanded motor operating range, this paper proposes a novel VFS-PMSM topology combining HCF magnets and anisotropic LCF magnets, instead of the isotropic LCF magnet used in a previous study [32]. The method of swiveling the magnetic pole of the LCF magnet [32] is adopted, which differs from the previously mentioned methods that magnetize/demagnetize the magnets in the same axis [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. It should be noted that there is a significant difference in flux generated and magnetizing field required between the easy and hard axes in the anisotropic magnets.…”

Section: Introductionmentioning

confidence: 99%

Swiveling Magnetization for Anisotropic Magnets for Variable Flux Spoke-Type Permanent Magnet Motor Applied to Electric Vehicles

Lee

Hsieh

2022

Energies

View full text Add to dashboard Cite

This paper investigates the application of anisotropic low-coercive force (LCF) magnets to a novel variable-flux spoke-type permanent magnet synchronous motor (VFS-PMSM) for electrical vehicles with a wide speed range. In the VFS-PMSM, flux is regulated by swiveling the magnetization of the anisotropic LCF magnets instead of directly magnetizing or demagnetizing them. The previously proposed VFS-PMSM uses only isotropic LCF magnets for easily swiveling the magnetic pole direction, resulting in lower torque density. The challenge thus lies in the feasibility to swivel the magnetic pole direction of the anisotropic LCF magnet, and the impact of the different magnetization strengths of the anisotropic magnets on the motor performance. This paper first studies the feasibility to swivel the magnetization direction of anisotropic LCF magnets through experiments. It is confirmed that the magnetization direction can be successfully swiveled by 90 degrees with a reduced external magnetizing field. Then, two VFS-PMSM topologies and various rotor configurations are compared in terms of key performance indices to determine critical sizing factors for performance enhancement. Finite element analysis is used for simulations. In comparison with the VFS-PMSM equipped with isotropic LCF magnets, the maximum torque of the proposed topology can be improved for the same flux adjustment ability. Alternatively, the flux adjustment ability can also be enhanced by 37.43% for the same maximum torque.

show abstract

A Novel Variable-Flux Permanent-Magnet Synchronous Machine With Quasi-Series Magnet Configuration and Passive Flux Barrier

Cited by 31 publications

References 9 publications

Development and comparison of double-stator memory machines with parallel hybrid magnets

Development and comparison of double-stator memory machines with parallel hybrid magnets

A Novel Variable Flux Spoke Type Permanent Magnet Motor With Swiveling Magnetization for Electric Vehicles

Swiveling Magnetization for Anisotropic Magnets for Variable Flux Spoke-Type Permanent Magnet Motor Applied to Electric Vehicles

Contact Info

Product

Resources

About