Optimization of Vibration and Noise Characteristics of Skewed Permanent Brushless Direct Current Motor

Lee, Chang-Min; Seol, Hyun-Soo; Lee, Jae Yong; Lee, Seung Hwan; Kang, Dong-Woo

doi:10.1109/tmag.2017.2711269

Cited by 21 publications

(15 citation statements)

References 14 publications

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“…Although many empirical rules have been established for correctly carrying out the skewing of stator and rotor, as to limit the maximum audible magnetic noise level radiated from the WHM-PMSM, none of these empirical rules have considered the stator's natural frequencies or variable-speed-analysis. The literature contains papers which have been recently published using empirical-based approaches to choose skewing angle [20][21][22][23][24][25] and numerical-based studies to minimize vibration and noise [21,26] without considering the natural frequencies, as well as variable-speed analysis in some cases. This study demonstrates how these important considerations can change the choice of skewing angle.…”

Section: Research Gap and Original Contributionsmentioning

confidence: 99%

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

2020

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This paper presents study of a multi-slice subdomain model (MS-SDM) for persistent low-frequency sound, in a wheel hub-mounted permanent magnet synchronous motor (WHM-PMSM) with a fractional-slot non-overlapping concentrated winding for a light-duty, fully electric vehicle applications. While this type of winding provides numerous potential benefits, it has also the largest magnetomotive force (MMF) distortion factor, which leads to the electro-vibro-acoustics production, unless additional machine design considerations are carried out. To minimize the magnetic noise level radiated by the PMSM, a skewing technique is targeted with consideration of the natural frequencies under a variable-speed-range analysis. To ensure the impact of the minimization technique used, magnetic force harmonics, along with acoustic sonograms, is computed by MS-SDM and verified by 3D finite element analysis. On the basis of the studied models, we derived and experimentally verified the optimized model with 5 dBA reduction in A-weighted sound power level by due to the choice of skew angle. In addition, we investigated whether or not the skewing slice number can be of importance on the vibro-acoustic objectives in the studied WHM-PMSM.

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Section: Research Gap and Original Contributionsmentioning

confidence: 99%

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

2020

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“…There are various V-shaped PM rotor variables which influence the torque characteristics of IPMSMs, and several methods have been shown to improve the torque characteristics of the V-shape IPMSM. In [9,10], the skewed slot stator is adopted in order to reduce the cogging torque and the torque ripple while in [11][12][13], the step-skewed rotor is used to achieve similar effects. These are in fact widely adopted traditional methods, which lead to an increase of the manufacturing cost/time and the decrease of the average output torque.…”

Section: Introductionmentioning

confidence: 99%

Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple

Gao

Sun

Gerada

et al. 2020

IET Electric Power Applications

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Interior permanent magnet synchronous machines (IPMSMs) with V‐shaped permanent magnet (PM) rotors are widely used as traction motors in electric vehicles because of their high torque density and high efficiency. However, the V‐shape IPMSMs have the disadvantages of inevitable torque ripple due to the non‐sinusoidal air‐gap flux density distribution and the utilisation of the reluctance torque. In this study, with the aim of improving the torque ripple characteristics, a modified V‐shaped IPMSM rotor configuration with bridges extended inwards towards the pole centre is proposed to generate a more sinusoidal air‐gap flux density waveform. The proposed topology, referred to as ‘Type C’ within this study, is compared with baseline rotor configuration references, namely ‘Type A’ which is a conventional V‐shaped PM rotor, as well as ‘Type B’ which is a related configuration with a mechanically non‐uniform air gap. The analysis results show that the rotor ‘Type C’ exhibits significant advantages in terms of reducing cogging torque, torque ripple and radial force, without incurring additional air‐gap friction losses. Finally, a prototype of the IPMSM with the proposed rotor configuration is manufactured and tested, verifying the predicted benefits experimentally.

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“…A study conducted in [11] proposed a multi-slice finite element method that can be used to replace the complex threedimensional finite element method in the analysis of skewed motors. In [12][13][14], effects that skewing has on the noise-vibration reduction of switched reluctance motors and permanent brushless direct current motors are analysed, respectively. Based on this single skewed motor design, a double skewed type and other new skewed types have been proposed, which have proven to offer improved effects on reducing the vibration and noise [15,16].…”

Section: Introductionmentioning

confidence: 99%

Study on the effects of rotor‐step skewing on the vibration and noise of a PMSM for electric vehicles

Wang

Sun

Gao

2019

IET Electric Power Applications

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Radial force F r is the main cause of electromagnetic vibration and noise in motors. In this study, the vibration and noise characteristics of a permanent magnet synchronous motor (PMSM) with consideration of rotor-step skewing are investigated. Firstly, the analytical model of F r considering rotor-step skewing is deduced based on the Maxwell stress tensor method. The influence of rotor-step skewing on F r of the PMSM is then analysed and summarised. Taking a 65 kW PMSM commonly used in electric vehicles as an example, combined with electromagnetic finite element analysis, F r is then evaluated. Secondly, an electromagnetic vibration and noise simulation analysis is conducted based on a multi-physical field joint simulation platform, from which the influence of rotor-step skewing on the vibration and noise is then summarised. Finally, a noise experiment is then carried out. The results obtained from the multi-physical analysis and the tests conducted are presented to validate the precision of the simulation models, and the accuracy of the analytical model of F r. 2 Structure of rotor-step-skewed PMSM 2.1 Structure features of rotor-step-skewed PMSM The rotor-skewing structure has been considered as an effective measure to suppress the electromagnetic vibration noise of PMSMs. The rotor structure with step skewing is shown in Fig. 1b. The rotor is divided into several segments equably in the axial direction, and each segment is shifted sequentially at the same angle in the circumferential direction. 2.2 Specifications of prototype The cross-sectional view of the prototype studied in this paper is shown in Fig. 2. The motor is an 8-pole 48-slot PMSM with a rated power of 65 kW. The specification of which is shown in Table 1.

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Optimization of Vibration and Noise Characteristics of Skewed Permanent Brushless Direct Current Motor

Cited by 21 publications

References 14 publications

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

Magnetic Noise Reduction of In-Wheel Permanent Magnet Synchronous Motors for Light-Duty Electric Vehicles

Improved V‐shaped interior permanent magnet rotor topology with inward‐extended bridges for reduced torque ripple

Study on the effects of rotor‐step skewing on the vibration and noise of a PMSM for electric vehicles

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