Magnetisation and demagnetisation of a component
AssigneeROLLS-ROYCE plc
InventorsAlexis Lambourne, Christopher D Riley
Life of this patent
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Abstract
A method of magnetising or demagnetising an annular component for a rotary machine, a flux arrangement for performing a magnetising or demagnetising method, and a flux assembly for such a flux arrangement; wherein, the annular component includes an alternating arrangement of radial elements and angular elements for forming a Halbach array. A magnetizer is caused to induce magnetic flux in a primary set of elements of the annular component including a primary radial element and an adjacent primary angular element. A shield element shields a secondary angular element of the annular component from magnetic flux from the magnetizer.
Claims17
A method of magnetising or demagnetising an annular component for a rotary machine, the annular component comprising an alternating arrangement of radial elements and angular elements for forming a Halbach array in which the elements have respective radial and angular magnetic orientation directions, the method comprising:
- causing a magnetizer to induce magnetic flux in a primary set of elements of the annular component comprising a primary radial element and an adjacent primary angular element;
- wherein the magnetizer is disposed at an angular location corresponding to the primary angular element;
- and a shield element shielding a secondary angular element of the annular component from magnetic flux from the magnetizer;
- wherein the secondary angular element is adjacent to the primary radial element, and wherein the shield element is disposed at an angular location corresponding to the secondary angular element.
A magnetising arrangement comprising:
- an annular component for a rotary machine, the annular component comprising an alternating arrangement of radial elements and angular elements for forming a Halbach array in which the elements have respective radial and angular magnetic orientation directions;
- a flux assembly comprising:
- a magnetizer configured to induce a magnetic flux in the elements of the annular component;
- and
- a shield element;
- wherein the magnetizer and shield element are angularly spaced apart with respect to a centroidal axis of the annular component;
- wherein the shield element is configured to present a barrier to inhibit magnetic flux in the annular component at an angular location corresponding to the shield element;
- wherein the flux assembly is configured to be disposed relative to the annular component so that, with the magnetizer at an angular location corresponding to a primary angular element and the shield element at an angular location corresponding to a secondary angular element, the magnetizer is configured to induce magnetic flux in a primary set of elements comprising the primary radial element and an adjacent primary angular element, with the shield element shielding the secondary angular element from the magnetic flux.
Dependencies are inferred from the claim text.