Hysteresis Loss in NdFeB Permanent Magnets in a Permanent Magnet Synchronous Machine
- Resource Type
- Periodical
- Authors
- Egorov, D.; Petrov, I.; Pyrhonen, J.J.; Link, J.; Stern, R.; Sergeant, P.; Sarlioglu, B.
- Source
- IEEE Transactions on Industrial Electronics IEEE Trans. Ind. Electron. Industrial Electronics, IEEE Transactions on. 69(1):121-129 Jan, 2022
- Subject
- Power, Energy and Industry Applications
Signal Processing and Analysis
Communication, Networking and Broadcast Technologies
Magnetic hysteresis
Magnetic field measurement
Loss measurement
Coercive force
Superconducting magnets
Magnetometers
Magnetic flux
Electric machines
loss measurement
magnetic field measurement
magnetic hysteresis
magnetic losses
magnetic materials
neodymium magnets
permanent magnet (PM) machines
permanent magnets (PM)
- Language
- ISSN
- 0278-0046
1557-9948
Most permanent magnet (PM) loss studies consider only eddy current loss and neglect hysteresis. In this article, the hysteresis behavior of two NdFeB PM grades with different magnetic properties is assessed when applied in a PMSM. Data from vibrating sample magnetometer measurements and hysteresis modeling are used as a base. In addition to the main magnetic phase, the samples contained magnetic phases with reduced coercivity. Such phases may contribute to hysteresis losses in a PM material. A new model is introduced to simulate the hysteresis of rare-earth magnets of any geometric shape in the second and first quadrants of the intrinsic BH -plane. The magnetic field strength distribution in the PM material of an electrical motor is analyzed by two-dimensional finite-element method. The results are used as the input data for an analytical hysteresis model. The results indicate that the hysteresis loss resulting from the structural imperfections and geometry of the magnet may introduce a considerable loss in NdFeB PMs applied in rotating electrical machines.