A winding structure designed to extend along a line of movement in an electrical machine, wherein the winding structure is realized as a flexible circuit structure, a flexible circuit structure being a combination of conductors and an insulating, flexible substrate, where the conductors are located in one or more layers of conductors, or - in short - layers, comprising elemental conductors in different layers being electrically connected by vias (30, 31, 32, 33, 34), wherein the elemental conductors are arranged and connected to form at least one winding phase element, wherein at least one winding phase element comprises at least two winding loops, a winding loop being a series connection of elemental conductors that begins at a location of a first terminal for powering the winding phase element, runs essentially in a first direction of the line of movement, then runs essentially in a second direction of the line of movement that is essentially opposed to the first direction, and optionally then runs essentially in the first direction, and ∘ either ends at a position whose orthogonal projection onto the line of movement is essentially identical to the orthogonal projection of the first terminal for powering onto the line of movement, ∘ or runs into a second terminal for powering the winding loop, wherein the winding structure comprises at least two layers of conductors; wherein the winding structure further comprising at least one group connection, a group connection being a connection of a first group and a second group by vias, a group being a set of at least two elemental conductors - that are in the same winding phase element, - that are substantially parallel to each other, and - that are arranged so that their current flows in the same direction, where each two elemental conductors connected by the group connection are part of a winding loop, the set of these winding loops being called the winding loops of the group connection; characterized in that at least one of the at least one group connection is a perturbed connection, a perturbed connection being a group connection that comprises at least one of the following: ∘ a horizontal perturbation, a horizontal perturbation being a connection that connects a set of winding loops of a first layer to a second layer and where the horizontal order of the set of winding loops is neither preserved nor mirrored; or ∘ a vertical perturbation, a vertical perturbation being at least one of the following group connections: ▪ a connection that brings two winding loops from different layers to a common layer, or vice versa; or ▪ a connection that connects a first winding loop that is on top, in the sense of layers, of a second winding loop on a first side of the connection and beneath, in the sense of layers, the second winding loop on a second side of the connection. ∘ either ends at a position whose orthogonal projection onto the line of movement is essentially identical to the orthogonal projection of the first terminal for powering onto the line of movement, ∘ or runs into a second terminal for powering the winding loop, - that are in the same winding phase element, - that are substantially parallel to each other, and - that are arranged so that their current flows in the same direction, ∘ a horizontal perturbation, a horizontal perturbation being a connection that connects a set of winding loops of a first layer to a second layer and where the horizontal order of the set of winding loops is neither preserved nor mirrored; or ∘ a vertical perturbation, a vertical perturbation being at least one of the following group connections: ▪ a connection that brings two winding loops from different layers to a common layer, or vice versa; or ▪ a connection that connects a first winding loop that is on top, in the sense of layers, of a second winding loop on a first side of the connection and beneath, in the sense of layers, the second winding loop on a second side of the connection. ▪ a connection that brings two winding loops from different layers to a common layer, or vice versa; or ▪ a connection that connects a first winding loop that is on top, in the sense of layers, of a second winding loop on a first side of the connection and beneath, in the sense of layers, the second winding loop on a second side of the connection.