PURPOSE: To make the position of the magnetic-pole center unchanged even when a part of permanent magnets is lost in a synchronous motor with the permanent magnets which have been divided into a plurality in the axial direction and to which a skew has been executed.
CONSTITUTION: The skew direction of adjacent cylindrical permanent magnets 2a, 2b is reversed, one-groove pitch skews are executed to the respective cylindrical permanent magnets 2a, 2b, and the magnetic-pole center 5 of the respective cylindrical permanent magnets 2a, 2b is made to agree. As a result, even when the cylindrical permanent magnet 2b is lost, the magnetic-pole center of the sound cylindrical permanent magnet 2a is indeitcal to the magnetic-pole center 5 before the permanent magnet is lost, and a thrust force in the axial direction is not generated. In addition, since the one-groove skews have been executed, a cogging torque can be reduced.
TOKIWA NOBUYUKI
KINOSHITA SHIGENORI
KITADA SHINICHIRO
HIRANO HIROYUKI
KANEKO YUTARO
YAMADA HIYOSHI
NISSAN MOTOR
DAIDO STEEL CO LTD
Next Patent: ROTOR WITH PERMANENT MAGNET OF MAGNET SYNCHRONOUS ROTATING MACHINE