Acta Medica Okayama 34 4 1998 Measuring system for magnetostriction of silicon steel sheet under AC excitation using optical methods EN Tomoya Nakase Masanori Nakano Koji Fujiwara Norio Takahashi <p>A measuring system for magnetostriction of silicon steel sheet using optical methods and a single sheet tester has been developed to establish a standard test method for IEC and JIS. Various factors affecting measurement accuracy and reproducibility of the developed system are examined. Two optical instruments, such as a laser Doppler vibrometer and a heterodyne displacement meter, are compared. 3-D characteristics of magnetostriction under ac excitation in the rolling direction are measured up to 2.0 T </p> No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 34 4 1998 Implementation and position control performance of a position-sensorless IPM motor drive system based on magnetic saliency 806 812 EN Satoshi Ogasawara Hirofumi Akagi <p>This paper describes position-sensorless control of an interior permanent magnet synchronous (IPM) motor, which is characterized by real-time position estimation based on magnetic saliency. The real-time estimation algorithm detects motor current harmonics and determines the inductance matrix, including rotor position information. An experimental system consisting of an IPM motor and a voltage-source pulsewidth modulation inverter has been implemented and tested to confirm the effectiveness and versatility of the approach. Some experimental results show that the experimental system has the function of electrically locking the loaded motor, along with a position response of 20 rad/s and a settling time of 300 ms</p> No potential conflict of interest relevant to this article was reported.