Motor with separated permanent magnet torque and reluctance torque and its optimal efficiency control

A motor with separated permanent magnet torque and reluctance torque, said motor comprising a casing, a radial motor inside the casing, a first axial motor and a second axial motor, the radial motor comprising the first axial motor and the second axial motor, respectively;

• wherein the radial motor comprises a radial stator and a radial rotor, wherein an integer slot distributed winding is adopted in the radial stator and a synchronous reluctance rotor is employed as the radial rotor, wherein the radial motor is adapted to produce only reluctance torque;
• wherein the first axial motor comprises a first axial stator and a first axial rotor, the second axial motor comprises a second axial stator and a second axial rotor, wherein in the first axial stator and the second axial stator, fractional slot concentrated windings are used;
• surface mounted permanent magnets are fixed on the second axial rotor and the first axial rotor, said permanent magnets having excitation directions parallel to an axial direction of the motor, and adjacent permanent magnets have opposite excitation directions, whereupon the axial motor only produces permanent magnet torque;
• and
• the radial motor is adapted for either an inner rotor or an outer rotor structure, the first axial motor and the second axial motor, the first axial stator and the first axial rotor being interchangeable in positions along the axial direction, and the second axial stator and a second axial rotor being interchangeable in positions along the axial direction, whereupon the radial motor generates radial flux, while the first axial motor and the second axial motor generate axial magnetic flux, and the radial flux and axial flux are perpendicular to each other, resulting in the decoupling of radial flux and axial flux.