Active element for an electromagnetic machines, a method of fabricating such an active element, and an electromagnetic machine including such an active element
View Patent ↗The invention provides an active element for an electromagnetic machine, the element comprising an alternating succession in a main direction of portions presenting a first magnetic property and of portions presenting a second magnetic property, wherein the element includes a non-magnetic covering that is thin relative to a thickness of the portions and that extends to cover a substantial fraction of an outside surface of the active element, the covering being secured to at least some of the portions and presenting sufficient strength to form a member for mechanically transmitting the magnetic forces to which the portions are subjected.
1. A method of fabricating an active element comprising an alternating succession in a main direction (X) of portions presenting a first magnetic property and of portions presenting a second magnetic property, the element comprising a non-magnetic covering that is thin relative to a thickness of the portions and that extends to cover a substantial fraction of an outside surface of the active element, the covering being secured to at least some of the portions and presenting sufficient strength to form a member for mechanically transmitting the magnetic forces to which the portions are subjected, wherein the portions are bars so that the active element is substantially in the form of a plate presenting two opposite large faces formed by the adjacent side faces of the bars, the covering extending to cover a substantial fraction of the large faces, the method comprising the steps of:
cutting parallel windows out in a sheet presenting a first magnetic property;
fitting in the windows portions that present a second magnetic property;
applying a covering to one of the two faces of the sheet so as to cover the portions substantially; and
cutting away the side margins of the sheet so that the sheet lying between two windows itself forms portions of the active element.
2. A method of fabricating an active element comprising an alternating succession in a main direction (X) of portions presenting a first magnetic property and of portions presenting a second magnetic property, the element comprising a non-magnetic covering that is thin relative to a thickness of the portions and that extends to cover a substantial fraction of an outside surface of the active element, the covering being secured to at least some of the portions and presenting sufficient strength to form a member for mechanically transmitting the magnetic forces to which the portions are subjected, wherein the portions are bars so that the active element is substantially in the form of a plate presenting two opposite large faces formed by the adjacent side faces of the bars, the covering extending to cover a substantial fraction of the large faces, the method comprising the steps of:
cutting parallel windows out in a sheet presenting a first magnetic property;
leaving the windows empty;
applying a covering to one of the two faces of the sheet so as to cover the portions substantially; and
cutting away the side margins of the sheet so that the sheet lying between two windows itself forms portions of the active element.