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.

The invention relates to a stator active part for an electric motor, preferably a permanent-magnet-excited synchronous machine consisting of a hollow-cylindrical yoke, comprising an inner cladding and having a receptacle space, into which a coil support is inserted, wherein the coil support consists of a peripherally-closed, hollow-cylindrical tubular body extending in the axial direction (A) of the yoke, on the outer cladding of said body a plurality of coil holders being formed, wherein a finely-distributed coil is installed on each coil holder.

The present invention relates to a stator housing for an axial flux electrical machine, the stator housing being tubular and substantially cylindrical in shape, the inner surface of the housing comprising a plurality of recesses, each recess configured to receive an outer part of a conductive coil of a stator of an axial flux electrical machine. The cross-section of each recess, perpendicular to the axis of rotation of the axial flux electrical machine, is preferably elongate, the major dimension of each elongate recess extending substantially in the radial direction of the axial flux electrical machine.

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 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.

The subject matter of the invention is the method of construction of a linear motor winding, consisting of phase paths, characterised in that a solid flat bar is cyclically bent at a selected binding radius R.sub.1, the active part and the end parts constitute a uniform plane of the phase path, which has got elongated end fragments: the beginning of the section and the end of the section or the phase path is cut of metal sheet, as shown in the figure and then, along the line, separating the end part from the active part, it is bent at the bending radius R.sub.2, where the bend angle α.sub.1 is within the range between 0° and 180°.

A coil support for preformed flat coils of a stator of an electric rotary motor includes an annular supporting structure and a plurality of columns extending upwardly from the supporting structure. The columns are spaced apart from each other to form a corresponding plurality of coil receiving portions configured to hold the preformed flat coils in place before a potting operation. Each of the coil receiving portions is configured to support a lower part of one of the preformed flat coils.

A torque motor for a servovalve is provided, the torque motor comprising an armature and a first pole piece. The first pole piece has a first portion and a second portion that is selectively moveable relative to the first portion such that a size of an air gap formed between the second portion and the armature is adjusted in response to the movement of the second portion relative to the first portion.

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 process for assembly of a brushless air core motor-generator includes assembling a rotor formed from two spaced apart rotor portions having magnetic poles that drive magnetic flux circumferentially through the rotor portions and back and forth across an armature airgap between the rotor portions. An air core armature is made by coating a nonmagnetic armature form with a tacky adhesive layer, and winding armature windings in a winding pattern onto the form with a winding head, using wire comprised of bundled multiple individually insulated conductor strands that are electrically connected in parallel but are electrically insulated from each other along their lengths where located inside the magnetic flux in the armature airgap. The armature windings are adhered to the nonmagnetic form simultaneously as the winding head traverses the winding pattern while applying pressure to the wire against the tacky adhesive, so tack of the tacky adhesive layer holds the wire to the armature form during the winding process, in the winding pattern later required for magnetic torque production. The air core armature is inserted into the armature airgap and mounted to a stator of the motor-generator for production of magnetically induced torque between the rotor and the stator.