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In this paper, a modified vector Jiles-Atherton (JA) model is proposed to simulate permanent magnet materials. Two correction coefficients related to the maximum magnetic flux density are introduced to improve the accuracy of the vector JA model in the simulation of the minor hysteresis loops. Hook-Jeeves direct search algorithm is used to identify...
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... minimizes the error function f (R). Since the identification coefficients are few and have monotonicity in the interval, the Hook-Jeeves algorithm is used to obtain R 1 and R 2 . It is a direct search algorithm that makes the initial value drop in a favorable direction to find a locally optimal solution [30]. The calculation process is shown in Fig. 4. Give the initial values x = [x 1 , x 2 , · · · , x n ] , the initial search step d, the acceleration factor m, and the calculation accuracy ε. When a local optimal solution is found at step d, the search step is reduced and the solution is searched again until d is less than ε. e j is the unit vector where the j th number is 1, and ...
Citations
... Jiles and Atherton [124] present the ferromagnet hysteresis model in mathematical form based on the concept of domain wall motion. Chen et al. [131] found that the modified Jiles-Atherton model can simulate permanent magnets. The Figure 10. ...
In this paper, a novel adjustable gap double-side axial flux permanent magnet hysteresis damper (AGDSAPHD) is proposed, of which the torque can be adjusted by changing the air gap and the magnetic field angle between the upper and lower stators at the same time. To analyze and design, a modified vector Jiles-Atherton (JA) hysteresis model is used for simulating the magnetic flux distribution and the hysteresis torque of AGDSAPHD. The eddy currents in the AGDSAPHD are analyzed, which have a great influence on the output torque when the rotational speed is fast. A splitting method used in the rotor of the AGDSAPHD is proposed to reduce the effect of eddy currents. The heat distribution of the AGDSAPHD is calculated to determine its slip power and operating mode. A prototype is built and tested to verify the reliability of the analysis. The experiments prove that the modified vector JA model has high computational accuracy in calculating the hysteresis effects of the AGDSAPHD. A splitting method used in the rotor can greatly reduce the eddy current torque. AGDSAPHD has a greater torque adjustment range and better temperature stability than the traditional one.
