Cogging Torque Calculation of Permanent Magnet Motor Considering Stress Distribution in Magnetic Core

Daikoku, Akihiro; Nakano, Mitsuru; Tani, Yoshiaki; Yamaguchi, S.; Toide, Yukari; Arita, Hideaki; Yoshioka, Takashi; Fujino, Chiyo

doi:10.1541/ieejias.126.74

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…10 show that the shrink fitting does not always causes the 2nd order component of the cogging torque -it depends on the shape of the deformation and how the stress is distributed. The effect extent can be estimated analytically as shown in [7]. Fig.11 shows the waveforms of the cogging torque, the target motor of which have frames made from iron.…”

Section: A Stress Distribution By Structural Analysis (Al Frame)mentioning

confidence: 99%

“…In this paper we showed a novel motor design method, considering the stress distribution in the motor core [7]- [9]. First we measured the magnetic characteristics of the single sheet specimen under stressed condition [10], and using these data we did the magnetic field analysis concerning the distribution of the magnetic characteristics resulting from the stress.…”

Section: Introductionmentioning

confidence: 99%

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A high precision motor design method by finite element analysis considering stress distribution in stator core

Daikoku

Nakano

Yamaguchi

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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In this paper we show a novel motor design method, considering stress distribution in the motor core. This method consists of several steps as follows: (a) measurement of magnetic characteristics of the electrical steel sheets in the state where the stress is added, (b) calculation of deformation and stress distribution using structural analysis, (c) pre-process of the magnetic field analysis, which makes FEM mesh deformed by the stress and changes the properties of each elements of the core corresponding to the distribution of the stress, and (d) magnetic field analysis using the measured data by step-(a) and the FEM mesh generated by step-(c). As an example, we show a result of cogging torque calculation of permanent magnet motors, considering the stress in the stator core resulting from shrink fitting in the frame. As a result, we show that the cogging torque waveform is different depending on the shape of the frame.

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Section: A Stress Distribution By Structural Analysis (Al Frame)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A high precision motor design method by finite element analysis considering stress distribution in stator core

Daikoku

Nakano

Yamaguchi

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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show abstract

“…In a previous paper [6], the authors derived the spatial distribution condition of the manufacturing error factor in the stator that causes cogging torque from the magnetic energy distribution inside the motor. And in other past papers [7,8], the authors have focused on the magnetic property of stator core materials as a manufacturing error factor, and have quantified the cogging torque component that is generated by the magnetic anisotropy or the nonuniform magnetic property distribution caused by stress.…”

Section: Introductionmentioning

confidence: 99%

Cogging torque investigation of PM motors resulting from asymmetry property of magnetic poles: Influence of performance variation between permanent magnets

Daikoku

Yamaguchi

2008

Electrical Engineering Japan

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SUMMARYThis paper examines the cogging torque of a permanent magnet (PM) motor resulting from the asymmetry property of magnetic poles, which comes from the performance variation between magnets. A PM motor with 32 poles (= 16 pole pairs) and 36 slots is selected for verification, because the motor whose pole/slot ratio is 8/9 is sensitive to the performance variation between permanent magnets. Assuming that two different magnetization levels of magnets are mixed together in one rotor, the amplitude of the 2.25th and 4.5th components of cogging torque, which show 36 (= 2.25 × 16) and 72 (= 4.5 × 16) times of pulsation per rotation respectively and both of which result from the asymmetry property of the magnetic poles, are evaluated. As a result, it is clarified that the cogging torque characteristics depend on the alignment pattern of the two kinds of magnets. The amplitudes of the 2.25th and 4.5th components of cogging torque are proportional respectively to the amplitude of the 36th and 72nd order harmonics of the squared magnetic flux density around the rotor which is set in the space without stator. Using the proportional constants found from the finite element analyses in some alignment patterns, the cogging torque amplitudes of the motors with other alignment patterns can be predicted by calculating the squared magnetic flux density around the rotor only. The predicted cogging torque amplitudes correspond to the actually calculated results.

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Cogging Torque Estimation of Permanent Magnet Motors Resulting from Magnetic Anisotropy of Non-oriented Electrical Steel Sheets

et al. 2006

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Cogging Torque Calculation of Permanent Magnet Motor Considering Stress Distribution in Magnetic Core

Cited by 8 publications

References 7 publications

A high precision motor design method by finite element analysis considering stress distribution in stator core

A high precision motor design method by finite element analysis considering stress distribution in stator core

Cogging torque investigation of PM motors resulting from asymmetry property of magnetic poles: Influence of performance variation between permanent magnets

Cogging Torque Estimation of Permanent Magnet Motors Resulting from Magnetic Anisotropy of Non-oriented Electrical Steel Sheets

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