The large permanent magnet synchronous machine(PMSM) usually adopts modularity technique to facilitate the manufacture and maintenance. In order to avoid the contact of adjacent coils between modules, a novel unwinding stator module combined permanent magnet synchronous machine (SMCPMSM) is proposed, in which each modular can operate independently. The number of input modules can be flexibly selected according to the torque requirement in the SMCPMSM of mill wrapping around to realize the optimal control of mill system efficiency. In this paper, the unwinding block method and its mathematical model of the SMCPMSM are described. The electromagnetic performance of the SMCPMSM and the operation performance of different power supply modules (PSMs) are analyzed, the radial force and electromagnetic vibration of the PSM in asymmetric operation is studied, which provides a reasonable basis for the part of PSM operation of the SMCPMSM in accordance with torque requirements.

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Analysis of Unwinding Stator Module Combined Permanent Magnet Synchronous Machine

Harmonic currents have a significant influence on the vibration behavior of electrical machines. Nevertheless, it remains a challenge to determine the optimum amplitude and phase position of the harmonic currents. This paper shows a way to enable acoustic optimization for permanent magnet synchronous motors using minimal flux harmonics by determining the most sensitive flux injection axis in advance without increasing the complexity of the optimization. The method was verified on the test bench using a commercial drive from a luxury class hybrid car. The vibrations of the problematic mode zero were almost completely eliminated without reducing the machine efficiency. The total sound pressure level of the machine was reduced by almost 10dB compared to the usual field oriented control.

Flux Injection with Reduced Degree of Freedom for Low Vibrations and Improved NVH in Permanent Magnet Synchronous Machines

Modelling, Calculation and Analysis of Electromagnetic Force and Vibroacoustic Behavior of Integer-Slot Permanent Magnet Synchronous Motor Considering Current Harmonics

Investigation of noise and vibration characteristics of an IPMSM with modular-type winding arrangements having three-phase sub-modules for fault-tolerant applications

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
.

https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/iet-epa.2019.0238

Peng Gao

Papers

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