Motor designs having spline structure connecting motor shaft and stator structure

An electrical machine that is an axial-flux and radial-flux motor, comprising:

• a rotor mounted rotatably about a machine axis, with the rotor rotatively attached to a shaft;
• and
• a stator assembly having a stator core with a non-ferromagnetic material, and including
• a radial-flux stator yoke including a continuous inner wall rigidly attached on a continuous outer wall of the stator core;
• a first axial-flux stator yoke with an inner wall rigidly attached on an outer surface of a first edge wall of the stator core, and a second axial-flux stator yoke having an inner wall rigidly attached on an outer surface of a second edge wall of the stator core, wherein the radial-flux stator yoke and the first and the second axial-flux stator yokes, each include laminated sheets and slots;
• windings are positioned in the slots of the radial-flux stator yoke and the first and the second axial-flux stator yokes;
• and
• wherein the stator core and the shaft include a spline coupling feature adapted to selectively couple and mate the shaft to the stator assembly, such that the spline coupling feature includes the stator core having an external spline structure and the shaft having a corresponding internal spline structure, such that the shaft is adapted to be inserted into or removed from the stator core.

A system comprising:

• a transceiver to receive signals from sensors associated with an axial-flux and radial-flux (AFARF) motor;
• a digital controller configured to receive the signals, and generate control signals specifying values of one or combination of a multi-phase voltage or a current for the AFARF motor, for tracking a reference trajectory of torques of the AFARF motor, wherein the AFARF motor has a load whose positioned by the AFARF motor and is controllable by the digital controller, such that the AFARF motor includes:
• a rotor mounted rotatably about a machine axis, with the rotor rotatively attached to a shaft;
• and
• a stator assembly having a stator core with a non-ferromagnetic material;
• a radial-flux stator yoke including a continuous inner wall rigidly attached on a continuous outer wall of the stator core;
• a first axial-flux stator yoke with an inner wall rigidly attached on an outer surface of a first edge wall of the stator core, and a second axial-flux stator yoke having an inner wall rigidly attached on an outer surface of a second edge wall of the stator core, wherein the radial-flux stator yoke and the first and the second axial-flux stator yokes, each include laminated sheets and slots;
• windings are positioned in the slots of the radial-flux stator yoke and the first and the second axial-flux stator yokes, and
• wherein the stator core and the shaft include a spline coupling feature adapted to selectively couple and mate the shaft to the stator assembly.