永久磁石同期モータの直軸および横軸インダクタンス算出法

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タイトル別名
  • A Method to Determine Direct- and Quadrature-Axis Inductances of Permanent Magnet Synchronous Motors
  • エイキュウ ジシャク ドウキ モータ ノ チョクジク オヨビ ヨコジク インダクタンス サンシュツホウ

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Equivalent circuit constants of permanent magnet synchronous motors are needed in the calculation of operation characteristics, construction of a control system, etc. These constants can be computed from the data on structural form and materials. However, measurements are necessary to obtain highly precise values. Measurement methods of the d- and q-axis inductances can be roughly divided into rotational and standstill methods. The standstill methods have the advantage that they are easy to carry out. However, it is difficult to consider magnetic saturation and distortion of the change in armature winding inductance. The accuracy of the standstill method can be improved if these effects can be readily taken into account.<br>This paper describes a standstill method for measuring accurate d- and q-axis synchronous inductances of permanent magnet synchronous motors. By utilizing the fact that the EMF interference terms in the motor voltage equation considering the distortion of the inductance change are equal to zero when the rotor is in a specific position, the proposed method determines the inductances considering both magnetic saturation and inductance distortion effects from simple off-line standstill testing. In addition, this method is capable of taking cross-magnetic saturation into account when used with the necessary testing equipment. The proposed method is implemented on a 0.4kW interior permanent magnet synchronous motor with concentrated stator winding. The validity of the proposed method is demonstrated by comparing measured and calculated results of no-load and on-load characteristics.

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