MAGNETIC POLE POSITION DETECTOR

Japanese Patent JP3971741

B2

PROBLEM TO BE SOLVED: To further precisely detect the magnetic pole position of a synchronous motor without the need for knowing in advance characteristics of a machine such as friction, and characteristics of the motor such as saliency and magnetic saturation.
SOLUTION: This magnetic pole position detector comprises first and second means that estimate the magnetic pole positions. The first means gives a current command by changing exciting phases and estimates an electric angle region of the magnetic pole position from the rotative direction and the exciting phase of the motor. Then, the first means estimates the magnetic pole position by reducing the region (S2 to S4). The second means successively changes the exciting phases and estimates a magnetic pole direction position from a current feedback when the current command is given. After that, the second means determines the orientation of the magnetic pole by applying a voltage that magnetically saturates, and estimates the magnetic pole position (S8 to S10). When the motor cannot be operated by the first means due to the friction or the like, the magnetic pole position is estimated by the second means. When the estimated magnetic pole position is varied by the second means, the magnetic pole position is estimated by the first means.

Yukio Toyosawa
Naoto Sonoda

JP2003388384A

September 05, 2007

November 18, 2003

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FANUC Corporation

H02P6/16; H02P1/46; H02P6/06; H02P6/08; H02P6/18; H02P6/182; H02P6/185; H02P6/28; H02P21/00; H02P21/14; H02P21/18; H02P21/22; H02P21/24; H02P21/28; H02P21/34; H02P23/14; H02P25/08; H02P27/04; (IPC1-7): H02P6/16; H02P6/18; //H02P7/05; H02P21/00

JP3408468B2
JP2002171798A
JP2000312493A

Matsuji Takemoto
Hideo Sugiyama
Koichi Yuda
Uozumi Takahiro

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