Electric Motor

Abstract: An electric motor in which the number of pole pairs of magnetic pole parts is m, the number of a plurality of teeth is 3m, and a rotor core has non-magnetic parts continuing from each of two end parts of a permanent magnet. Each magnetic pole part has a magnetic pole outer peripheral surface formed on an outer peripheral surface between a first boundary line and a second boundary line that pass through a rotation center (O) of a rotor and an outer peripheral end of each non-magnetic part in the radial direction of the rotor core. The magnetic pole outer peripheral surface has a front-side outer peripheral surface (29-F) positioned on the front side in the rotation direction (R) of the rotor relative to a d-axis, and a rear-side outer peripheral surface (29-R) positioned on the rear side in the rotation direction (R) relative to the d-axis. When the magnetic pole part is virtually folded back along the d-axis in the plane, and the front-side outer peripheral surface (29-F) is overlapped on the rear-side outer peripheral surface (29-R), the front-side outer peripheral surface (29-F) has a small-diameter outer peripheral surface (34) positioned further inward than the rear-side outer peripheral surface (29-R) in the radial direction.

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