Cogging Torque Reduction by Slot-Opening Shift for Permanent Magnet Machines

Liu, Ting; Huang, Shoudao; Gao, Jian; Lu, Kaiyuan

doi:10.1109/tmag.2013.2239977

Cited by 73 publications

(48 citation statements)

References 6 publications

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“…In the same manner, the authors of [8] offer a method that by keeping the center lines of the slots unchanged and shifting only the slot openings, the cogging torque decreases while the three-phase back-EMF is not deteriorated. In the study, the desired shift angle depends upon the number of slots forming the group and the quantity of groups.…”

Section: Stator Teeth Pairing and Non-uniformly Distributed Teethmentioning

confidence: 99%

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Fast Design of Asymmetrical Permanent Magnet Synchronous Machines That Minimize Pulsating Torque

Ortega¹

2017

PIER B

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Abstract-Torque pulsations in Permanent Magnet Synchronous Machines are mainly created by interaction between the permanent magnets and stator teeth, harmonics in the stator current, steel saturation and partial magnet demagnetization. As a consequence of torque ripple, there are increased noise and vibrations. To overcome them, some methods for reducing pulsating torque include controlledasymmetry. The strategy seeks for compensate or cancel out spatial harmonics of flux density in the air gap. This work proposes an analytical method based upon sub-domain model that allows techniques such as stator teeth pairing, slot opening shift, nonuniform teeth, tangential shift of magnets, different magnet widths, among others, to be utilized and motor performance quickly analyzed. Since asymmetries introduce several degrees of freedom, the design of Permanent Magnet Synchronous Machines can be accelerated by means of analytical-based tools. The proposed model is validated with Finite Element method.

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Section: Stator Teeth Pairing and Non-uniformly Distributed Teethmentioning

confidence: 99%

“…Some examples of controlled-asymmetries are: stator teeth pairing [6], slot opening shift [8], nonuniform teeth [14], tangential shift of magnets [1,2,4,15,16], different magnet widths [13] and uneven placement of flux barriers in PM assisted synchronous reluctance motors [3].…”

Section: Introductionmentioning

confidence: 99%

Fast Design of Asymmetrical Permanent Magnet Synchronous Machines That Minimize Pulsating Torque

Ortega¹

2017

PIER B

View full text Add to dashboard Cite

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“…However, the detent force caused by the slot and end effects in LPMSMs will reduce the positioning accuracy, introduce the vibration and noise, and deteriorate the control characteristics [5]- [8]. Similar to the conventional rotary PMSMs, the slot effect can be minimized by using skewed PMs [9], [10], slot-opening shifting [11], [12], and appropriate slot/pole combination [13]. However, the end effect is more significant and difficult to eliminate, as the end force waveform is periodic over one pole pitch [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Minimization of Detent End Force in Linear Permanent Magnet Synchronous Machines

Liu

Zhao

et al. 2018

IEEE Trans. Ind. Electron.

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“…Regardless of the PMSM, torque pulsations come from various sources, and they can be attributed to cogging torque, flux harmonics and errors in current measurements [11][12][13][14][15][16][17][18][19][20]. Among these, the former two factors are often the main causes of the poor control precision of PMSMs.…”

Section: Introductionmentioning

confidence: 99%

“…Broadly speaking, the techniques for torque ripple suppression can be divided into two categories. The first approach focuses on the optimal design of PMSM [11,12] and inhibits torque ripples by means of skewing the stator slots or rotor poles. Nevertheless, there are many occasions in which these methods are not sufficient to eliminate torque ripples.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Speed Control Based on Multiple Phase-Shift Resonant Controllers for Gimbal System in MSCMG

2018

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Abstract:The high precision speed control of gimbal servo system in magnetically suspended control moment gyro (MSCMG) suffers from periodic torque disturbances, which lead to periodic fluctuations in speed control. This paper proposes a novel multiple phase-shift resonant controller (MPRC) for a gimbal servo system to suppress the periodic torque ripples whose frequencies vary with the operational speed of the gimbal servo motor and high-speed motor. First, the periodic torque ripples caused by cogging torque, flux harmonics and the dynamic unbalance of the high speed rotor are analyzed. Second, the principle and structure of MPRC parallel with proportional integral (PI) controllers are discussed. The design and stability analysis of the proposed MPRC plus PI control scheme are given both for the current loop and speed loop. The closed-loop stability is ensured by adjusting the phase in the entire operational speed range. Finally, the effectiveness of the proposed control method is verified through simulation and experimental results.

show abstract

Cogging Torque Reduction by Slot-Opening Shift for Permanent Magnet Machines

Cited by 73 publications

References 6 publications

Fast Design of Asymmetrical Permanent Magnet Synchronous Machines That Minimize Pulsating Torque

Fast Design of Asymmetrical Permanent Magnet Synchronous Machines That Minimize Pulsating Torque

Analysis and Minimization of Detent End Force in Linear Permanent Magnet Synchronous Machines

High-Precision Speed Control Based on Multiple Phase-Shift Resonant Controllers for Gimbal System in MSCMG

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