Loss Analysis of IPM Motors Considering Carrier Harmonics

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Other Title
  • キャリア高調波を考慮したIPMモータの損失解析
  • キャリア高調波を考慮したIPMモータの損失解析--三次元有限要素法による永久磁石渦電流損算定
  • キャリア コウチョウハ オ コウリョ シタ IPM モータ ノ ソンシツ カイセキ 3ジゲン ユウゲン ヨウソホウ ニ ヨル エイキュウ ジシャク ウズデンリュウ ソン サンテイ
  • —三次元有限要素法による永久磁石渦電流損算定—
  • —Calculation of Eddy Current Loss in Permanent Magnet Using 3-D Finite Element Method—

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In this paper, we investigate losses of interior permanent magnet motors driven by PWM inverters using 3-D finite element analysis, which can estimate the eddy current loss in the permanent magnet accurately. The calculated losses are compared with the measured results and the theoretical solution to verify the validity of the analysis. The method to decompose the electromagnetic field distribution into time-harmonic components is introduced in order to investigate the effects of the harmonic fields separately and to specify the main loss factors. The variation of the magnet eddy current loss due to the division of the magnet is also investigated. It is clarified that the magnet eddy current loss of the magnet depends on the voltage modulation ratio of the inverter and the magnetic saturation of the core. It can be said that the thickness of the divided magnet should be smaller than the skin depth of the eddy currents produced by the major harmonics for the loss reduction.

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