Electric machine rotor

An electric machine rotor comprising:

• a plurality of plates stacked along a first axis, each of the plates defining V-shaped pairs of cavities, each V-shaped pair of cavities defining a pole arc angle, each cavity having a permanent magnet pocket and a magnetic field guide chamber extending radially outward from the permanent magnet pocket relative to the first axis, wherein offset angles between the magnetic field guide chambers and the permanent magnet pockets vary within at least one of the V-shaped pairs of cavities and do not vary within at least one of the V-shaped pairs of cavities within each plate, and wherein the plates are stacked such that the permanent magnet pockets between adjacent plates are axially aligned and such that the magnetic field guide chambers between adjacent plates are axially offset.

An electric machine rotor comprising:

• a plurality of plates stacked along a first axis, each of the plates defining V-shaped pairs of cavities, each V-shaped pair of cavities defining a pole arc angle, each cavity having a permanent magnet pocket and a magnetic field guide chamber extending radially outward from the permanent magnet pocket relative to the first axis, wherein offset angles between the magnetic field guide chambers and the permanent magnet pockets varies between at least a first and a second of the V-shaped pairs of cavities within each plate such that each plate defines at least two different pole arc angles, and wherein the plates are stacked such that the permanent magnet pockets between adjacent plates are axially aligned and such that the magnetic field guide chambers between adjacent plates are axially offset.