A General Analytical Model of Permanent Magnet Eddy Current Couplings
Citations
84 citations
Cites background or methods from "A General Analytical Model of Perma..."
...It has been shown in [18] that the first harmonic component plays a dominant role in the torque transmission for eddy-current couplings (around 98% of the total torque)....
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...In order to predict accurately the torque-speed characteristic for larger slip values, a more complex model which takes into account the reaction field effect must be used [16]-[18], but this is out of the scope of the present paper....
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...The induced currents in the conducting plate are computed by solving a 2D diffusion equation leading to a complex expression for the transmitted torque [16]-[18]....
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...It has been shown in [18], [20] and [22] that the 3D endeffects cannot be neglected for such devices....
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79 citations
Cites background or result from "A General Analytical Model of Perma..."
...Indeed, the edge effects in the radial direction have a great importance on the torque–speed curve prediction, and cannot be neglected [19], [20]....
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...It was shown in [20] that this additional torque is small compared with the one due to the copper plate....
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76 citations
Cites background or methods from "A General Analytical Model of Perma..."
...The axial flux PM eddy current coupling studied in this section has the same basic structure and physical parameters as the 75 kW prototype with the double-sided structure described in [13]....
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...The actual magnets with other shapes, such as circular shaped and fan-shaped magnets, can all be equalized to the corresponding rectangular shaped one with the same area and thickness [13]....
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68 citations
Cites background or methods from "A General Analytical Model of Perma..."
...In addition, the very existence of a radial component of the magnetic field may be another reason [4]....
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...This correction factor is widely applied in torque calculations for eddy current devices [4]–[9], [16]....
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...To simplify the analytical modeling inspired by [1], [2], [4]–[6], [14], and [19], we can simplify real 3-D models of the axial-flux type to a 2-D model by imaging that the structure is cut in a radial direction and rolled out flat in the circumferential direction along an equivalent circle of magnets (at the equivalent radius Re with Re ∈ [Ri , Ro])....
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...To facilitate the analytical treatment of the eddy current problem inspired by [4], [32], and [35], the PM magnetic field is treated as a time-harmonic field due to the relative motion (slip) between the PMs and the conductor....
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34 citations
Cites background from "A General Analytical Model of Perma..."
...However, it has been shown that this correction factor is not always accurate [5], [6]....
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References
720 citations
221 citations
"A General Analytical Model of Perma..." refers background in this paper
...Reference [25] presented a correction factor which was derived from the ratio of the eddy current loss associated with a 2-D current distribution to that due to a 1-D current field (i....
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183 citations
"A General Analytical Model of Perma..." refers background in this paper
...The empirical coefficient is set to 0.75, following Agarwal [24]....
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...2) Limiting nonlinear theory Agarwal [24] suggested that the magnitude of the magnetic flux density may be considered constant if the magnetic field intensity is strong enough....
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...The eddy current loss per unit area is (62) B. 2) Limiting nonlinear theory Agarwal [24] suggested that the magnitude of the magnetic flux density may be considered constant if the magnetic field intensity is strong enough....
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93 citations
83 citations
"A General Analytical Model of Perma..." refers background in this paper
...The numerical approaches, however, are commonly hampered by the convergence of iteration calculation and the computational stability for high-speed cases by reason of high Peclet numbers, especially for 3-D problems [7], [8]....
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