Electric Motor

Abstract: In this electric motor, the number of pole pairs of magnetic pole sections (11) is m, the number of tooth sections is 3m, and a rotor core has non-magnetic sections extending from both ends of a permanent magnet. In a plane orthogonal to the rotation center line of a rotor, when a rotor core outer peripheral surface within a range forming one pole pair is defined as a one pole pair outer peripheral surface such that the shape of the outer peripheral surface of the rotor core is rotationally symmetric with respect to the rotation center (O) of the rotor, the outer peripheral surface of the rotor core is formed by repeating the shape of the one pole pair outer peripheral surface m times in the circumferential direction of the rotor core . Each magnetic pole section (11) has a magnetic pole outer peripheral surface formed on the outer peripheral surface of the rotor core between a first boundary line and a second boundary line which pass through the rotation center (O) and the outer peripheral end of the rotor core of each non-magnetic section in the radial direction. Each pole pair has an N-pole magnetic pole section (11N) and an S-pole magnetic pole section (11S) which are disposed on mutually opposite sides of a q-axis (Q). In the plane, when one of the N-pole magnetic pole section (11N) and the S-pole magnetic pole section (11S) is virtually rotated around the rotation center (O) by 360/(2m) [degrees] and superposed on the other, the magnetic pole outer peripheral surface (29N) of the N-pole magnetic pole section (11N) and the magnetic pole outer peripheral surface (29S) of the S-pole magnetic pole section (11S) are formed so as not to coincide with each other in shape.

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