Abstract
This paper presents the design for a high-speed permanent magnet synchronous machine (PMSMs) considering the demagnetization and mechanical characteristics of rare-earth magnets based on the operating temperature. The TRV equation and plane stress analytical method are considered for the temperature, the rotor size is derived from the analysis results of the sleeve thickness, and the stator is designed on the basis of the results of the electromagnetic analysis method. The B–H curve of the permanent magnet (PM) changes with its operating temperature; thus, a thermal demagnetization analysis is conducted to verify the irreversible demagnetization caused by the operating temperature and armature reaction field using electromagnetic finite element method (FEM). It is necessary to consider the irreversible demagnetization with the operating temperature because it can decrease the electromagnetic performance. Therefore, the electromagnetic characteristics of high-speed machines using rare-earth PMs are analyzed to confirm irreversible demagnetization. The validity of the proposed design is confirmed via comparative verifications with the measured results from prototype models.
Highlights
The rapid development of manufacturing technologies for permanent magnets (PMs) in recent times has dramatically improved the efficiency and output power of PM synchronous machines (PMSMs); this has prompted the use of direct-drive-type highspeed PMSMs instead of the conventional mechanical gear transmission systems in various industrial fields
This paper presents the design for a high-speed permanent magnet synchronous machine (PMSMs) considering the demagnetization and mechanical characteristics of rare-earth magnets based on the operating temperature
To validate the design results and the proposed method, the back-electromotive force (EMF) measurements and temperature saturation experiments were performed to confirm the operation of the fabricated machine using the proposed method without reduction of the output power and with breakage under the continuous operating temperature condition of 150 ○C
Summary
The rapid development of manufacturing technologies for permanent magnets (PMs) in recent times has dramatically improved the efficiency and output power of PM synchronous machines (PMSMs); this has prompted the use of direct-drive-type highspeed PMSMs instead of the conventional mechanical gear transmission systems in various industrial fields. MPa kg/m3 um/m-C MPa characteristics; Park designed the rotor structure of an interior permanent magnet synchronous motor (IPMSM) based on the irreversible characteristics of the PM along with its structural analysis.. MPa kg/m3 um/m-C MPa characteristics; Park designed the rotor structure of an interior permanent magnet synchronous motor (IPMSM) based on the irreversible characteristics of the PM along with its structural analysis.13 These studies did not consider the changes in the characteristics of the rotor structure based on the operating temperatures. In this study, a simplified analytical model was developed and applied to prevent rotor breakage and to derive the mechanical stress for the rotor structure design by considering the temperature conditions. Based on the operating temperature, the stress characteristics generated by shrink fitting would change according to the thermal expansion characteristics of the materials. Through the TRV, an outer diameter of 26 mm and a length of 80 mm in the axial direction were selected
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
