Kabushiki Kaisha Yaskawa Denki

Hyun-Soo Song

Shinya Morimoto

Kozo Ide

Mamoru Takaki

The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion () for correcting the pole position command and a thrust force or torque pattern correcting portion () for correcting the thrust force or torque pattern, and an initial pole position is estimated through a repetitive correction.

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Kitakyushu, Japan

Hyun-Soo Song