Radial flux electrical machines

An electrical machine as claimed in 1, wherein the stator has a body that defines a longitudinal axis a substantially cylindrical inner surface and an inner volume, and having a plurality of electromagnetic elements, each of which includes a stator core of ferromagnetic material and a winding of electrically conductive material located around at least part of the stator core of the electromagnetic element, the electromagnetic elements being arranged around the inner surface of the stator, and operable to induce a magnetic flux field in a radial direction in the inner volume of the stator, and wherein the inner surface of the body of the stator and the electromagnetic elements of the stator define cooperating engagement features of shape that serve to prevent relative rotation between the body of the stator and the electromagnetic elements, and which allow relative longitudinal movement between the body of the stator and the electromagnetic elements, and wherein the body of the stator comprises an upper surface and a lower surface, and in which the inner surface extends between the upper and lower surface of the body of the stator, and in which the inner surface of the stator provides one or more channel, which extend in a substantially longitudinal direction with respect to the body of the stator.

An electrical machine as claimed in 1, wherein the stator has a body that defines a longitudinal axis a substantially cylindrical inner surface and an inner volume, and having a plurality of electromagnetic elements, each of which includes a stator core of ferromagnetic material and a winding of electrically conductive material located around at least part of the stator core of the electromagnetic element, the electromagnetic elements being arranged around the inner surface of the stator, and operable to induce a magnetic flux field in a radial direction in the inner volume of the stator, and wherein the inner surface of the body of the stator and the electromagnetic elements of the stator define cooperating engagement features of shape that serve to prevent relative rotation between the body of the stator and the electromagnetic elements, and which allow relative longitudinal movement between the body of the stator and the electromagnetic elements, and wherein the stator core of each electromagnetic element provides recesses for receiving the corresponding electrically conductive winding.

An electrical machine as claimed in 1, wherein the stator has a body that defines a longitudinal axis a substantially cylindrical inner surface and an inner volume, and having a plurality of electromagnetic elements, each of which includes a stator core of ferromagnetic material and a winding of electrically conductive material located around at least part of the stator core of the electromagnetic element, the electromagnetic elements being arranged around the inner surface of the stator, and operable to induce a magnetic flux field in a radial direction in the inner volume of the stator, and wherein the inner surface of the body of the stator and the electromagnetic elements of the stator define cooperating engagement features of shape that serve to prevent relative rotation between the body of the stator and the electromagnetic elements, and which allow relative longitudinal movement between the body of the stator and the electromagnetic elements, in which the inner surface of the body of the stator is multi- faceted.

An electrical machine as claimed in 1, wherein the stator has a body that defines a longitudinal axis a substantially cylindrical inner surface and an inner volume, and having a plurality of electromagnetic elements, each of which includes a stator core of ferromagnetic material and a winding of electrically conductive material located around at least part of the stator core of the electromagnetic element, the electromagnetic elements being arranged around the inner surface of the stator, and operable to induce a magnetic flux field in a radial direction in the inner volume of the stator, and wherein the inner surface of the body of the stator and the electromagnetic elements of the stator define cooperating engagement features of shape that serve to prevent relative rotation between the body of the stator and the electromagnetic elements, and which allow relative longitudinal movement between the body of the stator and the electromagnetic elements, wherein the rotor comprises a plurality of spaced apart openings for receiving permanent magnets therein, the openings extending radially.