Characteristic Analysis and Experimental Verification of Electromagnetic and Vibration/Noise Aspects of Fractional-Slot Concentrated Winding IPMSMs of e-Bike

Abstract

In this study, we performed the electromagnetic and mechanical characteristic analyses of an 8-pole 12-slot interior permanent magnet synchronous motor (IPMSM). Permanent magnet synchronous motors are classified into surface permanent magnet synchronous motor and interior permanent magnet synchronous motors according to the type of rotor. The IPM type is advantageous for high-speed operation because of the structure where the permanent magnet is embedded inside the rotor, and it has the advantage of having a high output density by generating not only the magnetic torque of the permanent magnet, but also the reluctance torque. However, such a motor has more vibration/noise sources than other types, owing to changes in reluctance. The sources of motor noise/vibration can be broadly classified into electromagnetic, mechanical, and aerodynamic sources. Electromagnetic noise sources are classified into electromagnetic excitation sources, torque pulsations, and unbalanced magnetic forces (UMFs). Vibration and noise cause machine malfunctions and affect the entire system. Therefore, it is important to analyze the electromagnetic vibration source. In this study, the electromagnetic characteristics of an IPMSM were analyzed through the finite element method to derive the UMF. Vibration and noise analyses were performed by electromagnetic–mechanical coupling analysis, and vibration and noise characteristics based on electromagnetic noise sources were analyzed.

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

“…Various electromagnetic simulation approaches study the structural dynamic impact on the motor NVH performance [14][15][16][17][18][19][20]. These calculations are significantly computation intensive and refer only to the rotor and stator geometry.…”

Advancements in Flux Switching Machine Optimization: Applications and Future Prospects

“…Extensive research has been conducted on unbalanced forces and vibrations in various types of electric machines including switched reluctance machines [105]- [107], fractional slot concentrated winding surface permanent magnet machines [102], [108], [109], induction machines [110], [111], wound-field synchronous machines [112], [113], and interior permanent magnet machines [104], [114], [115]. Different design approaches have been proposed to mitigate electromagnetic vibrations by modifying the geometric dimensions and topologies of the machines.…”

Analysis of and Reduction in Noise in Current Measurement of XCP under the Laboratory Condition

“…Therefore, it is of great significance to study the interference of the external electromagnetic field source on the measurement accuracy of the XCP sensor when the falling distance of the XCP is relatively short [29]. Therefore, in the laboratory environment, a DC motor is used to simulate the noise effect of the hull on the XCP sensor [30], and then the measurement accuracy and error data of the external electromagnetic interference in the simulated environment are analyzed.…”