Wide-speed multiple interior rotor excitation machine

An electric machine comprising:

• a magnetically permeable cylindrically shaped stator assembly comprising stator windings positioned within stator teeth;
• a rotor body extending through the stator assembly, configured to rotate circumferentially about a longitudinal axis within the stator assembly, comprising magnetically permeable material configured to conduct magnetic flux, and comprising a plurality of rotor slot clusters each comprising a plurality of rotor slots each extending longitudinally through the magnetically permeable material of the rotor body and comprising a nested semi-hexagonal slot pattern in a plane orthogonal to the longitudinal axis, the nested semi-hexagonal slot pattern being symmetrical about a d-axis of the rotor body and bisected by a perimeter of the rotor body;
• and
• a rotor assembly comprising the rotor body, and for each of the plurality of rotor slot clusters, the rotor assembly comprises a rotor d-axis field winding extending through a first portion of slots in the nested semi-hexagonal slot pattern and a rotor q-axis field winding extending through a second portion of slots in the nested semi-hexagonal slot pattern,
• wherein the rotor d-axis field winding is configured to carry current to produce magnetic flux aligned with the d-axis, and
• wherein the rotor q-axis field winding is configured to carry current to produce magnetic flux aligned with a q-axis.

An electric machine comprising:

• a magnetically permeable cylindrically shaped stator assembly comprising stator windings positioned within stator teeth;
• a rotor body extending through the stator assembly, configured to rotate circumferentially about a longitudinal axis within the stator assembly, comprising magnetically permeable material configured to conduct magnetic flux, and comprising a plurality of rotor slot clusters each comprising a plurality of rotor slots each extending longitudinally through the magnetically permeable material of the rotor body and comprising a nested semi-hexagonal slot pattern in a plane orthogonal to the longitudinal axis, the nested semi-hexagonal slot pattern being symmetrical about a d-axis of the rotor body and bisected by a perimeter of the rotor body;
• and
• a rotor assembly comprising the rotor body, and for each of the plurality of slot clusters, the rotor assembly comprises permanent magnets extending through a first portion of slots in the nested semi-hexagonal slot pattern and a rotor q-axis field winding extending through a second portion of slots in the nested semi-hexagonal slot pattern,
• wherein the permanent magnets are configured to produce magnetic flux aligned with the d-axis, and
• wherein the rotor q-axis field winding is configured to carry current to produce magnetic flux aligned with a q-axis.

An electric machine comprising:

• a magnetically permeable cylindrically shaped stator assembly comprising stator windings positioned within stator teeth;
• a rotor body extending through the stator assembly, configured to rotate circumferentially about a longitudinal axis within the stator assembly, comprising magnetically permeable material configured to conduct magnetic flux, and comprising a plurality of rotor slot clusters each comprising a plurality of rotor slots each extending longitudinally through the magnetically permeable material of the rotor body and comprising a nested semi-hexagonal slot pattern in a plane orthogonal to the longitudinal axis, the nested semi-hexagonal slot pattern being symmetrical about a d-axis of the rotor body and bisected by a perimeter of the rotor body;
• and
• a rotor assembly comprising the rotor body, and for each of the plurality of slot clusters, the rotor assembly comprises a rotor d-axis field winding extending through a first portion of slots in the nested semi-hexagonal slot pattern and permanent magnets extending through a second portion of slots in the nested semi-hexagonal slot pattern,
• wherein the rotor d-axis field winding is configured to carry current to produce magnetic flux aligned with the d-axis, and
• wherein the permanent magnets are configured to produce magnetic flux aligned with the d-axis.