Review of Time and Space Harmonics in Multi-Phase Induction Machine

Modern multiphase electric machines take advantage of additional degrees of freedom for various purposes, including harmonic current injection to increase torque per ampere. This new approach introduces a non-sinusoidal air gap flux density distribution causing additional technical problems and so the conventional assumptions need to be revised. The paper presents a methodology for synthesis of air gap magnetic field generated by a symmetrically distributed multiphase windings including the rotor field reaction due to the machine’s load. The proposed method is suitable either for single-layer or double layer windings and can be adopted either for full-pitched or chorded winding including slots effects. The article analyses the air gap flux density harmonic content and formulates conclusions important to multiphase induction motors. It also discusses effects of time harmonic currents and illustrates the principle of changing number of pole-pairs typical for harmonic currents being injected to increase torque.

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The effect of space harmonic components in the air gap magnetic flux density on torque characteristic of a squirrel-cage induction machine

2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe) ◽

10.1109/epe.2015.7309221 ◽

2015 ◽

Cited By ~ 4

Author(s):

Vladimir Kindl ◽

Karel Hruska ◽

Roman Pechanek ◽

Jan Sobra ◽

Bohumil Skala

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Induction Machine ◽

Air Gap ◽

Magnetic Flux Density ◽

Space Harmonic ◽

Squirrel Cage ◽

Harmonic Components

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Diagnosis of the combined rotor faults using air gap magnetic flux density spectrum for an induction machine

International Journal of Systems Assurance Engineering and Management ◽

10.1007/s13198-017-0621-9 ◽

2017 ◽

Vol 8 (S2) ◽

pp. 1503-1519 ◽

Cited By ~ 4

Author(s):

Abdellatif Seghiour ◽

Tahar Seghier ◽

Boubakeur Zegnini ◽

George Georgoulas

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Induction Machine ◽

Air Gap ◽

Magnetic Flux Density ◽

Density Spectrum ◽

Rotor Faults

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Control for Optimized Air-Gap Magnetic Field of Five-Phase Induction Motor through Dual-Plane Asynchronous Rotation Transformation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.347-350.486 ◽

2013 ◽

Vol 347-350 ◽

pp. 486-490

Author(s):

Mu Yi Yin ◽

Ling Zhang ◽

Peng Zhu ◽

Fei Guan

Keyword(s):

Magnetic Field ◽

Induction Motor ◽

Flux Density ◽

Mechanical Load ◽

Air Gap ◽

Linear Functions ◽

Magnetic Flux Density ◽

Third Harmonic ◽

The Third ◽

Air Gap Magnetic Field

This paper presents a control scheme with an optimized air-gap magnetic field for five-phase induction motor, the control objective is to generate a quasi-square magnetic flux density by the control of excitation and torque currents in the two planes. In this paper, the decoupling vector control model of five-phase induction motor in d1-q1-d3-q3 coordinate system is analyzed, and the direct and quadrature current components in the third harmonic plane as non-linear functions of the fundamental are built, which guarantee the air-gap magnetic to be a constant quasi-square waveform irrespective of the mechanical load, and then the third harmonic current injected method for improved air-gap magnetic field is proposed. Finally, the simulations by Matlab/Simulink and experiments are implanted on a 5.5 kW, five-phase concentrated full-pitch windings induction motor. The results indicate that the proposed method can satisfy the requirement of a quasi-square air-gap flux density, and the air-gap magnetic field gets improved.

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Larger Torque Production Method for Multi-Phase MATRIX Motor Using Online Air-Gap Flux Density Control

2018 21st International Conference on Electrical Machines and Systems (ICEMS) ◽

10.23919/icems.2018.8549399 ◽

2018 ◽

Author(s):

Shunya Sakamoto ◽

Yudai Okajima ◽

Kan Akatsu

Keyword(s):

Flux Density ◽

Production Method ◽

Air Gap ◽

Density Control ◽

Multi Phase

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Numerical calculation of the effect of the induction machine load on the air gap magnetic flux density distribution

2017 18th International Scientific Conference on Electric Power Engineering (EPE) ◽

10.1109/epe.2017.7967260 ◽

2017 ◽

Cited By ~ 2

Author(s):

Jan Laksar ◽

Jan Sobra ◽

Lukas Veg

Keyword(s):

Numerical Calculation ◽

Magnetic Flux ◽

Density Distribution ◽

Flux Density ◽

Induction Machine ◽

Air Gap ◽

Magnetic Flux Density ◽

Machine Load ◽

Flux Density Distribution

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An Exact Analytical Solution of Halbach Arrays Permanent-Magnet Motor for Magnetic Field on Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.416-417.58 ◽

2013 ◽

Vol 416-417 ◽

pp. 58-65 ◽

Cited By ~ 1

Author(s):

Chen Li ◽

Hang Zhang ◽

Li Bing Jing ◽

Yue Jin Zhang ◽

Jie Bao Li

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Flux Density ◽

Analytical Method ◽

Exact Analytical Solution ◽

Air Gap ◽

Reaction Field ◽

Armature Reaction ◽

Air Gap Magnetic Field ◽

Halbach Arrays

An exact analytical model of Halbach arrays permanent-magnet (PM) motor is established for the calculation of air-gap magnetic field on load in this paper. The exact analytical method is based on the resolution of Laplaces or Poissons equations by applying the boundary conditions on the interface between each sub-domain: air-gap, Halbach arrays and slots. The waveforms of no-load magnetic field flux density, back electromotive force (EMF), armature reaction field flux density, air-gap magnetic field flux density on load and electromagnetic torque, which computed by the analytical method were validated through the finite-element method (FEM).

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