Analysis of Electromagnetic, Thermal, and Vibro-Acoustic Behavior in Permanent Magnet (PM) Motors
A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Electrical Machines and Drives".
Deadline for manuscript submissions: 31 October 2026 | Viewed by 1384
Editors
Interests: motor; vibration
Special Issues, Collections and Topics in MDPI journals
Interests: thermal analysis and control of permanent magnet motor system
Interests: permanent magnet machine design; analysis and optimization
Special Issue Information
Dear Colleagues,
The comprehensive analysis of electromagnetic, thermal, and vibro-acoustic behavior in Permanent Magnet (PM) motors is of paramount significance in modern engineering, driven by the global push for electrification and higher performance standards. This multi-physics approach is not merely an academic exercise but a critical engineering practice for developing superior, competitive, and reliable products.
Firstly, the electromagnetic design is the origin of all forces. It dictates the motor's torque density, efficiency, and crucially, the electromagnetic forces (e.g., radial and tangential forces) that act on the stator structure. These forces, particularly harmonics at specific frequencies, are the primary excitations for vibration and noise. An optimized electromagnetic design minimizes these force harmonics, tackling the noise problem at its source.
However, these electromagnetic phenomena are intrinsically linked to thermal effects. High current densities and alternating magnetic fields generate losses, leading to temperature rise. This heat significantly impacts material properties: permanent magnets can irreversibly demagnetize, and the electrical resistivity of windings increases, reducing efficiency. Furthermore, thermal expansion alters critical air-gap dimensions, which in turn affects the electromagnetic forces and acoustic performance. A thermal analysis alone is insufficient without understanding its electromagnetic causes and mechanical consequences.
Finally, the structural response to electromagnetic forces, under thermal stresses, determines the final noise output. Vibro-acoustic analysis simulates how the motor's structure—stator, housing, and rotor—vibrates and radiates sound. A design with low electromagnetic force harmonics can still be noisy if its structural natural frequencies coincide with these excitation forces, causing resonance.
Therefore, the integrated electromagnetic-thermal-vibro-acoustic analysis is indispensable. It enables a holistic design optimization, ensuring high efficiency and torque while guaranteeing low-noise operation, mechanical integrity, and thermal reliability. This leads to products that are not only more powerful and efficient but also quieter, smoother, longer-lasting, and more comfortable for the end-user, which is a decisive competitive advantage in markets from electric vehicles to consumer appliances and industrial automation.
Dr. Jianfeng Hong
Prof. Dr. Junci Cao
Dr. Ya Li
Dr. Chen Wang
Guest Editors
Manuscript Submission Information
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Keywords
- permanent magnet machines
- vibration and noise
- optimal design
- thermal analysis
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