An electromagnetic machine includes a rotor and a stator. The rotor is adapted to rotate about an axis. The stator includes a support structure, a plurality of bobbins engaged to the support structure, and a plurality of electric coils with each one wound about a respective bobbin of the plurality of bobbins.

A ring cylindrical casing and a method for manufacturing the ring cylindrical casing of a rotating electromechanical apparatus and a rotating electromechanical apparatus including the ring cylindrical casing, wherein the ring cylindrical casing has a substantially cylindrical inner surface and/or substantially cylindrical outer surface, wherein the ring cylindrical casing includes a helical lamination stack of a helically wound strip of magnetically permeable material, having multiple turns, wherein the strip includes two main surfaces and two side surfaces, wherein at least one of the main surfaces includes an insulation coating.

A coil arrangement for an electric motor includes a plurality of individual coils and a plurality of housing modules. Each of the housing modules is a plastics part that is separately produced from the coil arrangement. Each of the housing modules is designed to enclose the same amount of the individual coils.

A permanent magnet synchronous motor is provided in the present disclosure. The permanent magnet synchronous motor includes a rotor and a stator, wherein the rotor comprises a rotating shaft and a cylindrical magnet surrounding the rotating shaft, the stator comprises a base, a cylindrical core received in the base and surrounding the magnet and coil windings assembled with the core, the coil windings are symmetrical about the center axis of the core, the coil winding comprises a plurality of coils inserted into the core, each coil comprises a body part and extended parts respectively extended from two ends of the body part, a plurality of body parts are superposed and disposed in the core, a plurality of extended parts are respectively extended in the radial direction of the core and fixed on two end faces of the core, and the plurality of extended parts are partially superposed and distributed in a step shape.

A permanent magnet synchronous motor is provided in the present disclosure. The permanent magnet synchronous motor includes a rotor and a stator, wherein the rotor comprises a rotating shaft and a cylindrical magnet surrounding the rotating shaft, the stator comprises a base, a cylindrical core received in the base and surrounding the magnet and coil windings assembled with the core, the coil windings are symmetrical about the center axis of the core, the coil winding comprises a plurality of coils inserted into the core, each coil comprises a body part and extended parts respectively extended from two ends of the body part, a plurality of body parts are superposed and disposed in the core, a plurality of extended parts are respectively extended in the radial direction of the core and fixed on two end faces of the core, and the plurality of extended parts are partially superposed and distributed in a step shape.

A conductive coil 12 for a yokeless axial flux electrical machine stator 1 with distributed windings and flux guides 30, a stator 1 comprising a plurality of such coils, a yokeless axial flux electrical machine 100 comprising the stator 1, and a method 500 of manufacturing a stator 1 are provided. The conductive coil 12 comprises a first active section 121 a and a second active section 121 b, each active section 121 a, 121 b extending in a generally radial direction substantially perpendicular to an axis of rotation of the electrical machine and comprising a plurality of winding turn portions 131a, 131 b stacked parallel to the axis of rotation such that a cross-section perpendicular to the radial direction of each active section 121a, 121 b is elongate with a major dimension parallel to the axis of rotation. The second active section 121 b is pitched apart in a circumferential direction and axially offset from the first active section 121 a.

A rotary electric machine includes a field element having magnetic poles, and an armature having a toothless structure. The armature includes a multiphase armature winding. The field element and the armature faces each other in a radial direction. A winding holding member has a cylindrical shape, and the armature winding is attached to the winding holding member such that conductor portions of the armature winding are arranged in a circumferential direction. A cylindrical covering member has a cylindrical shape and covers the conductor portions of the armature winding. The conductor portions of the armature winding are interposed between the winding holding member and the cylindrical covering member. A resin is interposed between the winding holding member and the cylindrical covering member. The cylindrical covering member covers a facing portion of the armature winding that faces the field element in the radial direction.

A stator (10) for an axial flux electrical machine (100), an axial flux machine (100) that includes the stator (10), and a method (500) of manufacturing a stator (10) are provided. The conductive coils (12) which form the stator (10) provide a structure which includes spaces (131a, 131b, 131c, 132a, 132b) for flux guides (30), which improves ease of stator manufacture. It also allows for a high number of slots per pole per phase, which provides a more sinusoidal back-EMF. The stator (10) comprises a plurality of circumferentially distributed conductive coils (12), each of the plurality of conductive coils configured to be connected to a phase of a multi-phase power supply and comprising at least one pair of active sections (121a, 121b), wherein each active section (121a, 121b) extends in a generally radial direction substantially perpendicular to an axis of rotation of the electrical machine (100), wherein the generally radially extending active sections (121a, 121b) of each pair are pitched apart in a circumferential direction, and wherein circumferentially adjacent conductive coils (12) circumferentially overlap to define a space of a first type (131a, 131b, 131c) for receiving a flux guide (30), each space of the first type (131a, 131b, 131c) being a circumferential space between two adjacent active sections of two different coils.

A slotless rotating electric machine includes a rotor having multiple alternating polarity permanent magnets that drive magnetic flux across a magnetic airgap formed with a slotless ferromagnetic stator. The stator includes a helical backiron formed from a ferromagnetic strip wound edgewise and extending axially, and an adhesive film on the radial airgap surface of the backiron. Armature windings of wire having individually insulated twisted strands diametrically enveloped by an outer serve are adhered to the adhesive film. The adhesive film holds the said serve to the backiron and the serve holds the strands to the adhesive film. The armature windings pressed into the adhesive film as a group after they are formed and adhered while the adhesive cures, such that the wire is both bonded to the radial airgap surface of the helical stator backiron and is additionally partially embedded in the adhesive film.

A slotless rotating electric machine includes a rotor having multiple alternating polarity permanent magnets that drive magnetic flux across a magnetic airgap formed with a slotless ferromagnetic stator. The stator includes a helical backiron formed from a ferromagnetic strip wound edgewise and extending axially, and an adhesive film on the radial airgap surface of the backiron. Armature windings of wire having individually insulated twisted strands diametrically enveloped by an outer serve are adhered to the adhesive film. The adhesive film holds the said serve to the backiron and the serve holds the strands to the adhesive film. The armature windings pressed into the adhesive film as a group after they are formed and adhered while the adhesive cures, such that the wire is both bonded to the radial airgap surface of the helical stator backiron and is additionally partially embedded in the adhesive film.