Rotor, rotating electric machine, and electric power steering device

A rotor, comprising:

• a shaft;
• a first rotor core and a second rotor core that are fixed to the shaft, and that are disposed so as to align in an axial direction along a center axis of the shaft;
• a plurality of first magnets that are disposed so as to align in a circumferential direction which revolves around the center axis on an outer circumferential surface of the first rotor core, and
• a plurality of second magnets that are disposed so as to align in the circumferential direction on the outer circumferential surface of the second rotor core, wherein
• locations of the plurality of first magnets and the plurality of second magnets are offset in the circumferential direction,
• a first protrusion is formed on the first rotor core,
• a second protrusion is formed on the second rotor core,
• the first protrusion is located between two of the first magnets adjacent to one another in the circumferential direction,
• the second protrusion is located between two of the second magnets adjacent to one another in the circumferential direction,
• locations of the first protrusion and the second protrusion are offset from one another in the circumferential direction,
• an interval between the plurality of first magnets and the plurality of second magnets in the axial direction is within a range of 0.5 to 3.0 mm,
• wherein the first protrusion and second protrusion extend beyond the first magnets and second magnets in the axial direction, respectively, and a length of the extension beyond the first magnets and the second magnets defines the interval, and
• wherein the first protrusion contacts one of the first magnets and the second protrusion contacts one of the second magnets in the axial direction, an axial most extension of the first protrusion is flush with the axial most surface of the first rotor core and an axial most extension of the second protrusion is flush with the axial most surface of the second rotor core.