Harmonic Currents Injection Strategy With Optimal Air Gap Flux Distribution for Multiphase 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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SVPWM control strategy to minimize circulation harmonic currents for VSI fed double star induction machine

2015 IEEE 12th International Multi-Conference on Systems, Signals & Devices (SSD15) ◽

10.1109/ssd.2015.7348157 ◽

2015 ◽

Cited By ~ 3

Author(s):

Hajer Kouki ◽

Mouldi Ben Fredj ◽

Habib Rehaoulia

Keyword(s):

Control Strategy ◽

Induction Machine ◽

Double Star ◽

Harmonic Currents

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Transient Modeling of Squirrel-Cage Induction Machine Considering Air-Gap Flux Saturation Harmonics

IEEE Transactions on Industrial Electronics ◽

10.1109/tie.2008.925644 ◽

2008 ◽

Vol 55 (7) ◽

pp. 2798-2809 ◽

Cited By ~ 30

Author(s):

Xiaoping Tu ◽

L.-A. Dessaint ◽

R. Champagne ◽

K. Al-Haddad

Keyword(s):

Induction Machine ◽

Air Gap ◽

Squirrel Cage ◽

Transient Modeling

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Research on the influence of driving harmonic on electromagnetic field and temperature field of permanent magnet synchronous motor

Archives of Electrical Engineering ◽

10.1515/aee-2017-0022 ◽

2017 ◽

Vol 66 (2) ◽

pp. 295-312 ◽

Cited By ~ 2

Author(s):

Hongbo Qiu ◽

Wenfei Yu ◽

Yonghui Li ◽

Cunxiang Yang

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Eddy Current ◽

Torque Ripple ◽

Eddy Current Loss ◽

Air Gap ◽

Current Harmonics ◽

Motor Torque ◽

Current Loss ◽

Harmonic Currents

AbstractAt present, the drivers with different control methods are used in most of permanent magnet synchronous motors (PMSM). A current outputted by a driver contains a large number of harmonics that will cause the PMSM torque ripple, winding heating and rotor temperature rise too large and so on. In this paper, in order to determine the influence of the current harmonics on the motor performance, different harmonic currents were injected into the motor armature. Firstly, in order to study the influence of the current harmonic on the motor magnetic field, a novel decoupling method of the motor magnetic field was proposed. On this basis, the difference of harmonic content in an air gap magnetic field was studied, and the influence of a harmonic current on the air gap flux density was obtained. Secondly, by comparing the fluctuation of the motor torque in the fundamental and different harmonic currents, the influence of harmonic on a motor torque ripple was determined. Then, the influence of different current harmonics on the eddy current loss of the motor was compared and analyzed, and the influence of the drive harmonic on the eddy current loss was obtained. Finally, by using a finite element method (FEM), the motor temperature distribution with different harmonics was obtained.

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