Numerical simulation and optimization for electromagnetic noises of permanent magnet synchronous motors in vehicles

Abstract

In the paper, the numerical simulation is conducted on the motor electromagnetic force firstly. Radial force waves of the motor are the main reason for causing electromagnetic vibration and noise. Then, electromagnetic forces are mapped into a structural model for computing electromagnetic vibration. Computational results are compared with experimental results, so the correctness of the computational model is verified. Then, electromagnetic noises are computed according to the vibration data of the motor. Electromagnetic noises of the motor are axis-symmetric in plane and plane. In plane , the electromagnetic noise of the motor is skew-symmetric relative to a 45° angle. In plane and plane , the noise is caused by the vibration of the end cap, while noise in plane is caused by electromagnetic radial forces. In addition, the motor electromagnetic noise has an obvious directivity. The motor also has obvious

A novel sparse reduced order formulation for modeling electromagnetic forces in electric motors

“…Electromagnetic-induced vibration and noise of an electric motor is mainly caused by radial force waves [3] on the stator surface as said in [10] and [7,11,24] also agree on this. In addition, this calculation is one of the most highly-time consuming and challenging.…”

“…As it is shown in different sources [3,9] , vibration and noise produced by electrical machines can be divided into three categories [10] : electromagnetic vibration and noise, mechanical noise (related to the mechanical assembly, in particular bearings) and aerodynamic noise (they are mainly caused by aerodynamic forces in ventilation components of the motor).…”

“…Contemporary electric motors are designed with higher magnetic flux density in the air gap which produces higher radial magnetic forces acting on the stator. This can lead to a rise of vibration and acoustic problems [3,10,24].…”

Noise Analysis and Optimization Design of an Electric–Mechanical–Hydraulic Power Coupler for the Vehicle

“…The electromagnetic force on the motor stator is the primary source of electromagnetic noise. [25][26][27] According to the Maxwell tensor method, the radial force density of the stator's inner surface is shown as follows.…”

“…When two noise sources produce different SPLs at the same point, that is L P1 6 ¼ 1L P2 . It is troublesome to calculate the total SPL L P according to Equation (20), which can be calculated by Equation (27).…”