Design and Analysis of a Five-Phase SPM Machine Considering Third Harmonic Current Injection

Article:Feng, J., Huang, L., Zhu, Z.Q. orcid.org/0000-0001-7175-3307 et al. (2 more authors) (2019) Torque density enhancement of 6/4 variable flux reluctance machine with 2nd harmonic current injection. IEEE Transactions on Energy Conversion, 34 (2). pp.Abstract-Variable flux reluctance machines (VFRMs) are developed as magnetless electrical machines. To extend the application of VFRMs, the enhancement of torque density is a key during machine design. In this paper, a novel 2 nd harmonic current injection method is developed for torque density enhancement for 6-stator-slot/4-rotor-tooth (6/4) VFRM. By using the analytical method, the optimal current profile with injected 2 nd harmonic current is obtained. The average torque of 6/4 VFRM is improved by 20% with the proposed method under all load conditions. Moreover, the proposed current profile has fixed harmonic proportions and is easily applicable to machines with different specifications. All the conclusions are confirmed by both finite element analyses and experimental results.Index Terms-Harmonic current injection method, reluctance machine, torque density. J.H. Feng (S'06) received his B.S. and M.S.

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“…where is the Lagrange multiplier coefficient. The maximal value of Tavg_012 is obtained when I0, I1 and I2 satisfy equation (19…”

Section: Nd Harmonic Current Injection Methodsmentioning

confidence: 99%

“…During the test, the total RMS current is set to 1.5A. The DC, the 1 st and 2 nd current components are set accordingly based on (19) and (23). The torque measurement is conducted under a low speed (100rpm) to keep a stable current and avoid the influence of PWM as much as possible.…”

Section: Experimental Verificationmentioning

confidence: 99%

Torque Density Enhancement of 6/4 Variable Flux Reluctance Machine With Second-Harmonic Current Injection

Feng

Huang

Zhu

et al. 2019

IEEE Trans. Energy Convers.

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“…Generally speaking, once the set [iVSD] contains both the real and imaginary part of each chosen space vector ih, the rotational matrix, built by combining the submatrices defined as per (12), can be verified to be unitary…”

Section: Choice Of the Rotational Transformationmentioning

confidence: 99%

“…In the case of machines characterized by an odd number of phases and a symmetrical winding configuration, it has been verified that, based on the stator winding loss minimization criterion, the optimal injection ratio coincides with the one between the corresponding magnets' induced back-EMFs [4][5][6][7][8][9][10][11][12][13]. Several applications of these strategies can be found, especially for five-phase machines [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Optimal Third-Harmonic Current Injection for Asymmetrical Multiphase Permanent Magnet Synchronous Machines

Cervone

Slunjski

Levi

et al. 2021

IEEE Trans. Ind. Electron.

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“…Genetic algorithm is employed to calculate the optimal injection ratios of harmonic currents [22]. The relationship between the output torque and the 3 rd harmonic current is established, which achieves the optimal value for maximizing the output torque [23].…”

Section: Introductionmentioning

confidence: 99%

Multi-Harmonic Currents Control Strategy for Five-Phase Permanent Magnet Machine with non-sinusoidal back-EMF

Zhang

Wang³

2024

IEEE Access

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This paper describes an optimal torque per peak current control method for a five-phase permanent magnet (PM) machine considering both 3 rd and 5 th harmonic currents. These optimal ratios to the fundamental component are analytically derived to maximize the output torque. It is found that except for the 3 rd harmonic current contributing to the output torque, the 5 th harmonic current can also produce the additional positive torque. However, the 5 th harmonic is zero sequence component for the five-phase machines, which does not exist in the phase windings. Hence, the neutral point is required to connect the middle point of the DC link capacitors for constructing flowing path. The conventional vector space decomposition (VSD) control is extended to zero sequence sub-plane, which can quantitatively control 5 th harmonic current. For a prototype five-phase PM machine, the average torque can be increased by 21.4% with 3 rd harmonic current injection. Meanwhile, 10.7% additional positive torque is achieved together with 3 rd and 5 th harmonic injection. The torque ripple remains similar to that without harmonics injection. Finally, the experiments are given to demonstrate the theoretical analysis.

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Design and Analysis of a Five-Phase SPM Machine Considering Third Harmonic Current Injection

Cited by 43 publications

References 20 publications

Torque Density Enhancement of 6/4 Variable Flux Reluctance Machine With Second-Harmonic Current Injection

Torque Density Enhancement of 6/4 Variable Flux Reluctance Machine With Second-Harmonic Current Injection

Optimal Third-Harmonic Current Injection for Asymmetrical Multiphase Permanent Magnet Synchronous Machines

Multi-Harmonic Currents Control Strategy for Five-Phase Permanent Magnet Machine with non-sinusoidal back-EMF

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