Magnetic core, winding with magnetic core, rotary electric machine, and brushless motor

Abstract

A magnetic core that includes: a back yoke portion having a first lower surface aligned in an up-down direction; a tooth distal end portion having a second upper surface and a second lower surface aligned in the up-down direction; and extending in the up-down direction and having an upper end in contact with the first lower surface and a lower end in contact with the second upper surface, the tooth portion constructed to have a winding portion of a conductor wound around the tooth portion as viewed in the up-down direction, wherein the magnetic core has at least one structure of: (A) one or more first protrusions protruding from the first lower surface, and (B) one or more second protrusions protruding from the second upper surface.