モータの等価回路定数は，特性算定や制御系の構築におrnいて必要となる。これらは，形状や材料のデータから算出rnすることも可能であるが，高精度な等価回路定数値を得るたrnめには，最終的には測定が必要となる。永久磁石同期モーrnタにおいては，電機子抵抗は直流電圧降下法，速度起電力走rn数は発電機運転試験によって測定することができる。%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.rnThis 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 0.4 kW 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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