Discrete modeling of the air-gap field of synchronous machines for computation of torque and radial forces

2008 ◽  
Vol 18 (2) ◽  
pp. 151-167 ◽  
Author(s):  
Marc Bekemans ◽  
Ernest Matagne ◽  
Francis Labrique
Keyword(s):  
Air Gap ◽  
Synchronous Machines ◽  
Discrete Modeling ◽  
Radial Forces

scholarly journals Inverse approach for concentrated winding surface permanent magnet synchronous machines noiseless design

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 643-651
Author(s):  
Patricio La Delfa ◽  
Michel Hecquet ◽  
Frederic Gillon
Keyword(s):  
Permanent Magnet ◽  
Radial Pressure ◽  
Air Gap ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Electromagnetic Noise ◽  
Magnetomotive Force ◽  
Inverse Approach ◽  
Spatio Temporal ◽  
Low Order

Abstract The electromagnetic noise generated by the Maxwell radial pressure is a well-known consequence. In this paper, we present an analytical tool that allows air gap spatio-temporal pressures to be obtained from the radial flux density created by surface permanent magnet synchronous machines with concentrated winding (SPMSM). This tool based on winding function, a global air-gap permeance analytical model and total magnetomotive force product, determines the analytical air-gap spatio temporal and spectral radial pressure.We will see step-by-step their impacts in generating noise process. Also two predictive methods will be presented to determine the origin of the lows radial pressure orders noise sources. The interest lies in keeping results very quickly and appropriate in order to identify the low order electromagnetic noise origin. Then through an inverse approach using an iterative loop a new winding function is proposed in order to minimize radial force low order previously identified and chosen.

Constant-Parameter Voltage-Behind-Reactance Modeling of Five-Phase Synchronous Machines With Air-Gap Flux Harmonics

2020 ◽  
Vol 35 (1) ◽  
pp. 119-129
Author(s):  
Navid Amiri ◽  
Seyyedmilad Ebrahimi ◽  
Yingwei Huang ◽  
Juri Jatskevich ◽  
Steven D. Pekarek
Keyword(s):  
Air Gap ◽  
Synchronous Machines ◽  
Constant Parameter

Saliency enhancement and torque ripple reduction of wound field synchronous machine by injecting optimum harmonic in rotor shape

2020 ◽  
Vol 64 (1-4) ◽  
pp. 447-455
Author(s):  
Wenping Chai ◽  
Byung-il Kwon
Keyword(s):  
Torque Ripple ◽  
Air Gap ◽  
Synchronous Machines ◽  
Torque Ripple Reduction ◽  
Harmonic Injection ◽  
Ripple Reduction ◽  
Low Torque ◽  
Rotor Shape ◽  
Traction System ◽  
Flux Density Distribution

This paper presents a new rotor shape design with optimum reverse 3rd harmonic for wound field synchronous machines to effectively enhance the saliency ratio and reduce the torque ripple in a micro electric vehicle traction system. Due to the enhanced saliency ratio, the reluctance torque is expected to be improved. The air gap flux density distribution is reshaped by the new rotor shape method, which benefits the low torque ripple. By contrast, the reverse 3rd harmonic injection is much more suitable than the general 3rd harmonic injection for increasing the effective air gap length along the q-axis for a high saliency ratio. Subsequently, three amplitudes of the reverse 3rd harmonic are studied and it is found that the optimum reverse 3rd harmonic is 1/6 of the fundamental one. To verify the effectivity of the proposed design, the original model and the ICS model are compared. Finally, all the motor characteristics, such as back electromotive force, cogging torque, and electromagnetic torque, are predicted using a 2-D finite-element method with the aid of JMAG-Designer.

scholarly journals Analytical Model to Calculate Radial Forces in Permanent-Magnet Synchronous Machines

2021 ◽  
Vol 11 (22) ◽  
pp. 10865
Author(s):  
Iratxo Gómez ◽  
Gustavo García ◽  
Alex McCloskey ◽  
Gaizka Almandoz
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
Analytical Model ◽  
Experimental Tests ◽  
Synchronous Machines ◽  
Magnetic Flux Density ◽  
Permanent Magnet Synchronous Machines ◽  
Electromagnetic Forces ◽  
Design Variables ◽  
Radial Forces

There are three principal sources of noise and vibration in electrical machines: electromagnetic sources, mechanical sources, and aerodynamic sources. Nowadays, one of the major advantages of permanent-magnet synchronous machines is their torque density. This density is achieved through a high magnetic flux density in the air gap, which is achieved through hard magnets. Unfortunately, in these machines, electromagnetic forces have been identified as the main source of vibration and noise, and high magnetic flux densities make these vibrations and noises more significant. With the aim of better understanding the relationship between electromagnetic forces and design variables, this article, which is the continuation of previous work, firstly describes a study of the sources of magnetic forces in permanent-magnet synchronous machines. Subsequently, an analytical model for the computation of the radial forces originating from electromagnetic sources in permanent-magnet synchronous machines is stated. This model analyzes the forces on both the rotor surface and the base of the stator tooth. The analytical results were corroborated through simulations using the finite element method (FEM) and also by experimental tests performed over two prototypes. The results achieved by the analytical model show good agreement with both FEM results and experimental measurements.

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