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Title: A quantitative comparison study of power-electronic-driven flux-modulated machines using magnetic field and thermal field co-simulation
Authors: Li, LN
Fu, WN 
Ho, SL 
Niu, SX 
Li, Y
Keywords: Electric machine
Finite-element method (FEM)
Flux modulation
Low-speed drive
Magnetic field
Permanent magnet (PM)
Thermal field
Torque density
Issue Date: 2015
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on industrial electronics, 2015, v. 62, no. 10, p. 6076-6084 How to cite?
Journal: IEEE transactions on industrial electronics 
Abstract: Low-speed flux-modulated permanent-magnet (PM) machines do not need to conform to the conventional design rule which requires identical number of pole-pairs in both stator and rotor. In flux-modulated machines, special ferromagnetic segments in the airgap are used to modulate the magnetic field. In this paper, a general rule to compare different types of electric machines as well as measures to improve the torque density in these machines are presented. In this paper, the energy conversion capacity of different machines with the same physical size and the same operating temperature-rise are compared. An adaptive-order method for modeling the load-temperature-rise relationship is presented to reduce the computing time for this inverse problem. Three power-electronic-driven PM electric machines, which are, namely, a traditional PM machine, a radial-flux-modulated machine (RFMM), and an axial-flux-modulated machine (AFMM), are analyzed and compared based on their temperature distribution and electromagnetic torque density using magnetic field and thermal field computation. Experimental results of an AFMM prototype are used to validate the temperature-rise which is computed using 3-D finite-element method (3-D FEM).
ISSN: 0278-0046
EISSN: 1557-9948
DOI: 10.1109/TIE.2015.2420039
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