Rotor Core, Rotor of Rotary Electrical Machine, Rotary Electrical Machine, and Automotive Auxiliary Electrical System

A rotor core configured by a plurality of laminated plates and forming a storage space for the magnet, comprising a magnetic pole which includes a base formed on an outer peripheral side of the storage space,

• wherein a plurality of the magnetic poles are provided in a circumferential direction,
• the magnetic pole includes a first protrusion which protrudes from the base along an outer periphery of the rotor core in one circumferential direction, and a second protrusion which is provided on an opposite side of the first protrusion with the base interposed therebetween and protrudes from the base along the outer periphery of the rotor core in another direction of the circumferential direction, and
• at least one of the first protrusion and the second protrusion is on an outer peripheral side from a first line segment which is a virtual line connecting an end of the first protrusion and an end of the second protrusion, and is formed to provide a space with the first line segment.