Investigation of Force Generation in a Permanent Magnet Synchronous Machine

Zhu, Weidong; Pekarek, Steve; Fahimi, Babak; Deken, B.

doi:10.1109/tec.2006.888034

Cited by 68 publications

(28 citation statements)

References 10 publications

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“…The interactions between the PM main field and PM slotting field would generate smaller spatial harmonics especially the second one is quite evident which might induce considerable vibration. Under rated-load case, the air-gap radial flux density harmonics can be divided into just three groups as shown in equation (10). The harmonics of the first and second groups can be approximately obtained from the decoupled PM and armature reaction magnetic field results, while the ones of the third group need to get from the overall magnetic field results under rated-load condition.…”

Section: B Static Fea With Frozen Permeability Techniquementioning

confidence: 99%

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

Fei

Luk

2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper investigates the radial electromagnetic force density and the associated vibration of an interior permanent magnet synchronous machine (IPMSM) with fractional-slot concentrated winding (FSCW) configuration. Interactions between magneto-motive force (MMF) harmonics, stator slotting effect, and rotor saliency effect will generate various air-gap magnetic field components, as well as radial electromagnetic force density harmonics. To develop an efficient yet realistic mechanism for the understanding of the force and vibration issues of the IPMSM under study, a combination of static two-dimensional (2-D) finite element analysis (FEA) and analytical methods is used to model the low order spatial harmonics of the machine's radial electromagnetic force density. The validity of the proposed approach is confirmed by the results from the high fidelity comprehensive transient 2-D FEA and 2-D fast Fourier transformation (FFT) methods. Moreover, comprehensive mechanical FEA are employed to carry out free and forced vibration investigations of the machine, which are verified by the experimental results.

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Section: B Static Fea With Frozen Permeability Techniquementioning

confidence: 99%

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

Fei

Luk

2013

2013 IEEE Energy Conversion Congress and Exposition

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“…Similar efforts have been made on shape optimization of the rotor, stator and/or permanent magnets to improve the motor characteristics in [9][10][11][12][13][14][15][16][17]. In [18][19][20][21][22] some efforts are made to study the local forces in surface mounted permanent magnet motor, switched reluctance motor and a simple electromagnetic device. However, a systematic approach is needed to improve the motor performance based on these observations.…”

Section: Introductionmentioning

confidence: 99%

Improving the Torque Characteristics of Interior Pm Synchronous Motor Using an Asymmetric on-Off Method on the Rotor Surface

Ghadamyari

Moallem

Fahimi³

2017

PIER M

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Abstract-In this paper, a novel technique for improving the torque characteristics of the Interior Permanent Magnet Synchronous Motor is proposed using rotor shape optimization. The main objective is to decrease the torque ripple while increasing average torque. The improvement process is performed for the maximum torque-angle operating point, and then studies are carried for other currents and angles. Defining a multi-element grid on rotor surface regions in which each element could be either iron or air, the best practical rotor surface topology could be obtained to improve the overall torque characteristics of IPMSM. The best motor performance is achieved using practical rotor shapes obtained from a cluster of points in average torque versus torque ripple plane. Finally, for torque ripple cancellation, two or three alternate rotor configurations with optimized average torque and out of phase torque pulsation have been selected. This selection will guarantee improved average torque while mitigating torque pulsation by a significant margin. Using this method, a rotor topology obtained in which torque ripple is reduced by 80% with slightly improved average torque.

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“…New or healthy machines generate some level of vibration but these vibrations change due to faults. Hence, vibration can be used to indicate the presence of faults, whereby both the nature and severity may be determined [11]. However, the over-all vibration signal of a machine is dependent on its structural components, structures to which it may be coupled to and the environment of operation [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Detection of static eccentricity faults in AFPM machine with asymmetric windings using vibration analysis

Ogidi

Barendse

Khan

2014

2014 International Conference on Electrical Machines (ICEM)

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Vibration signature has been proposed for fault diagnosis in electrical machines but its efficacy is hinged on proper determination of vibrating frequencies. Thus, this paper explores the applicability and performance of using vibration analysis on axial flux permanent magnet (AFPM) machine with asymmetric windings under static eccentricity (SE). The test rig developed to accurately replicate the faults is described and the vibration induced by electromagnetic forces associated with SE is investigated. The more dominant frequency component affected by the fault is the 2 nd harmonic of the magnetic force. The amplitude of the harmonic increased considerably with worsening SE. Along with other frequency components identified, it is proposed as an index for SE fault detection in AFPM machine.

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Investigation of Force Generation in a Permanent Magnet Synchronous Machine

Cited by 68 publications

References 10 publications

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

Investigation of radial electromagnetic force density and vibration in a fractional-slot interior permanent magnet synchronous machine

Improving the Torque Characteristics of Interior Pm Synchronous Motor Using an Asymmetric on-Off Method on the Rotor Surface

Detection of static eccentricity faults in AFPM machine with asymmetric windings using vibration analysis

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