### Abstract

Surface permanent magnet synchronous motors (SPMSMs) have been used for high-performance applications which demand high levels of torque smoothness. This paper presents current optimization strategies to achieve the smooth torque production in SPMSMs. The proposed techniques are based on a newly developed mathematical model which takes into account spatial harmonics of the rotor magnet flux. Based on this model, the smooth torque production can be achieved by adjusting the armature current vector in the rotating frame. Consequently, the waveform of the optimized excitation current is non-sinusoidal. The current optimization algorithm requires low-computational cost. Moreover, the optimized current contributes not only to the torque ripple suppression but also to the winding resistive loss reduction. The effectiveness of the current optimization techniques is confirmed by analytical verifications by using generalized machine models. In addition to this analytical approach, simulation and experimental verifications are implemented in a typical 3-phase SPMSM which has concentrated windings.

Original language | English |
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Title of host publication | Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 |

Pages | 1188-1195 |

Number of pages | 8 |

DOIs | |

Publication status | Published - 2013 |

Event | 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 - Chicago, IL Duration: 2013 May 12 → 2013 May 15 |

### Other

Other | 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 |
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City | Chicago, IL |

Period | 13/5/12 → 13/5/15 |

### Fingerprint

### Keywords

- Spatial harmonic
- stator resistive loss
- surface permanent magnet synchronous motor
- torque ripple

### ASJC Scopus subject areas

- Electrical and Electronic Engineering

### Cite this

*Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013*(pp. 1188-1195). [6556284] https://doi.org/10.1109/IEMDC.2013.6556284

**Current optimization strategy for surface permanent magnet synchronous motor drives based on a rigorous mathematical model.** / Nakao, Noriya; Akatsu, Kan.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013.*, 6556284, pp. 1188-1195, 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013, Chicago, IL, 13/5/12. https://doi.org/10.1109/IEMDC.2013.6556284

}

TY - GEN

T1 - Current optimization strategy for surface permanent magnet synchronous motor drives based on a rigorous mathematical model

AU - Nakao, Noriya

AU - Akatsu, Kan

PY - 2013

Y1 - 2013

N2 - Surface permanent magnet synchronous motors (SPMSMs) have been used for high-performance applications which demand high levels of torque smoothness. This paper presents current optimization strategies to achieve the smooth torque production in SPMSMs. The proposed techniques are based on a newly developed mathematical model which takes into account spatial harmonics of the rotor magnet flux. Based on this model, the smooth torque production can be achieved by adjusting the armature current vector in the rotating frame. Consequently, the waveform of the optimized excitation current is non-sinusoidal. The current optimization algorithm requires low-computational cost. Moreover, the optimized current contributes not only to the torque ripple suppression but also to the winding resistive loss reduction. The effectiveness of the current optimization techniques is confirmed by analytical verifications by using generalized machine models. In addition to this analytical approach, simulation and experimental verifications are implemented in a typical 3-phase SPMSM which has concentrated windings.

AB - Surface permanent magnet synchronous motors (SPMSMs) have been used for high-performance applications which demand high levels of torque smoothness. This paper presents current optimization strategies to achieve the smooth torque production in SPMSMs. The proposed techniques are based on a newly developed mathematical model which takes into account spatial harmonics of the rotor magnet flux. Based on this model, the smooth torque production can be achieved by adjusting the armature current vector in the rotating frame. Consequently, the waveform of the optimized excitation current is non-sinusoidal. The current optimization algorithm requires low-computational cost. Moreover, the optimized current contributes not only to the torque ripple suppression but also to the winding resistive loss reduction. The effectiveness of the current optimization techniques is confirmed by analytical verifications by using generalized machine models. In addition to this analytical approach, simulation and experimental verifications are implemented in a typical 3-phase SPMSM which has concentrated windings.

KW - Spatial harmonic

KW - stator resistive loss

KW - surface permanent magnet synchronous motor

KW - torque ripple

UR - http://www.scopus.com/inward/record.url?scp=84881630914&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881630914&partnerID=8YFLogxK

U2 - 10.1109/IEMDC.2013.6556284

DO - 10.1109/IEMDC.2013.6556284

M3 - Conference contribution

SN - 9781467349758

SP - 1188

EP - 1195

BT - Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013

ER -