Coil assembly
A coil assembly for an electric motor having an encapsulation body includes a fixing cage, a winding region, and encapsulation material. The fixing cage, a rear side of which is open, has an inner side and an outer side, between which a circumferential receiving region is defined. The winding region is arranged in an end region of the coil assembly and over which the fixing cage is placed at the end such that the winding region is arranged in the receiving region. The fixing cage and the winding region are embedded in the encapsulation material.
1 . A coil assembly for an electric motor having an encapsulation body, the coil assembly comprising:
a fixing cage, a rear side of which is open and which has an inner side and an outer side, between which a circumferential receiving region is defined,
a winding region arranged in an end region of the coil assembly and over which the fixing cage is placed at the end such that the winding region is arranged in the circumferential receiving region of the fixing cage, and
an encapsulation body comprised of encapsulation material, in which the fixing cage and the winding region are embedded, wherein the encapsulation body has a top wall and a side wall,
wherein the fixing cage has a circumferential inner top edge web and a circumferential outer top edge web, and wherein a perforated top side is defined by intermediate webs which run between the top edge webs and
wherein the inner side and the outer side of the fixing cage are each perforated and are each defined by a plurality of side webs, which run from the circumferential inner top edge web and the circumferential outer top edge web to the rear side of the fixing cage, wherein the circumferential outer top edge web is exposed on the side wall of the encapsulation body or at an outer edge of the encapsulation body, and
wherein the intermediate webs run radially between the top edge webs and have a bent profile, with an inner top edge axially offset from an outer top edge, the inner top edge projecting beyond the outer top edge at an end, wherein each intermediate web has at least two bends that are not in a same horizontal plane such that the at least two bends are offset from each other.
2 . The coil assembly as claimed in claim 1 , wherein a region forming a surface region of the encapsulation body is an exposed region of the fixing cage.
3 . The coil assembly as claimed in claim 1 , wherein the circumferential receiving region is annular.
4 . The coil assembly as claimed in claim 1 , wherein the encapsulation body has a cavity, around which the inner side of the fixing cage extends.
5 . The coil assembly as claimed in claim 1 , wherein the encapsulation body is a hollow body with a cylindrical outer shell.
6 . The coil assembly as claimed in claim 1 , wherein the fixing cage is configured to hold wires of the winding region within the circumferential receiving region of the fixing cage.
7 . The coil assembly as claimed in claim 1 , wherein the fixing cage is elastically deformed such that the fixing cage clamps on the winding region.
8 . The coil assembly as claimed in claim 1 , wherein the fixing cage is one piece.
9 . The coil assembly as claimed in claim 1 , wherein side webs extend from the top edge webs to the rear side of the fixing cage.
10 . The coil assembly as claimed in claim 9 , wherein the intermediate webs run radially and the side webs run at right angles or almost at right angles relative to the intermediate webs.
11 . The coil assembly as claimed in claim 2 , wherein the fixing cage is elastically deformed such that the exposed region of the fixing cage is flush with a surface of the encapsulation material surrounding the exposed region.
12 . The coil assembly as claimed in claim 1 , wherein the fixing cage is a first fixing cage, the winding region is a first winding region, and the encapsulation body is a first encapsulation body, and a second encapsulation body having a second fixing cage and a second winding region is provided, and wherein the first and the second winding regions are arranged in opposite end regions of the coil assembly.
13 . The coil assembly as claimed in claim 1 , which is a stator coil assembly.
14 . The coil assembly as claimed in claim 2 , wherein the circumferential receiving region is annular.
15 . The coil assembly as claimed in claim 2 , wherein the encapsulation body has a cavity, around which the inner side of the fixing cage extends.
16 . The coil assembly as claimed in claim 3 , wherein the encapsulation body has a cavity, around which the inner side of the fixing cage extends.