A magnetic gear arrangement comprises: (i) a first gear member for generating a first magnetic field, (ii) a second gear member for generating a second magnetic field, and (iii) a coupling device which provides arrangements of interpoles between the first gear member and the second gear member. The
A magnetic gear arrangement comprises: (i) a first gear member for generating a first magnetic field, (ii) a second gear member for generating a second magnetic field, and (iii) a coupling device which provides arrangements of interpoles between the first gear member and the second gear member. The interpoles couple the first and second magnetic fields such that different arrangements of interpoles produce different gear ratios between the first and second gear members. The coupling device comprises a plurality of ferromagnetic pole elements which at leastly partly form the interpoles. Each pole element has a Curie temperature whereby the pole element is active below its Curie temperature and inactive above its Curie temperature. The magnetic gear arrangement further comprises a temperature controller for controlling the temperature of at least some of the pole elements such that, under the control of the temperature controller, the temperatures of pole elements can cross their respective Curie temperatures and thereby change from active to inactive or the reverse.
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1. A magnetic gear arrangement comprising: a first gear member for generating a first magnetic field,a second gear member for generating a second magnetic field, anda coupling device that provides arrangements of interpoles between the first gear member and the second gear member, the interpoles cou
1. A magnetic gear arrangement comprising: a first gear member for generating a first magnetic field,a second gear member for generating a second magnetic field, anda coupling device that provides arrangements of interpoles between the first gear member and the second gear member, the interpoles coupling the first and second magnetic fields such that different arrangements of the interpoles produce different gear ratios between the first and second gear members;wherein:the coupling device comprises a plurality of ferromagnetic pole elements that at least partly form the interpoles, each of the plurality of ferromagnetic pole elements having a Curie temperature such that each of the plurality of ferromagnetic pole elements is active below its Curie temperature and inactive above its Curie temperature, andthe magnetic gear arrangement further comprises a temperature controller for controlling a temperature of at least some of the plurality of ferromagnetic pole elements such that, under the control of the temperature controller, the temperatures of the plurality of ferromagnetic pole elements can cross their respective Curie temperatures and thereby change from active to inactive or the reverse. 2. The magnetic gear arrangement according to claim 1, wherein a different arrangement of the interpoles can be provided by the coupling device when the plurality of ferromagnetic pole elements cross their respective Curie temperatures. 3. The magnetic gear arrangement according to claim 1, wherein a portion of the plurality of ferromagnetic pole elements has a first Curie temperature, and another portion of the plurality of ferromagnetic pole elements has a higher second Curie temperature. 4. The magnetic gear arrangement according to claim 1, wherein the temperature controller and the coupling device are configured such that the temperature controller varies the temperatures of all the plurality of ferromagnetic pole elements of the coupling device, and all of the plurality of ferromagnetic pole elements can be maintained at substantially the same temperature. 5. The magnetic gear arrangement according to claim 1, wherein the temperature controller and the coupling device are configured such that the temperature controller varies the temperatures of only a selected portion of the plurality of ferromagentic pole elements of the coupling device, and a temperature differential can be maintained between the plurality of ferromagentic pole elements of the coupling device. 6. The magnetic gear arrangement according to claim 1, wherein an action of the temperature controller is itself determined by an operating condition of at least one of the first and second gear members. 7. The magnetic gear arrangement according to claim 6, further comprising a sensor for detecting the operating condition of at least one of the first and second gear members and communicating the operating condition to the temperature controller. 8. The magnetic gear arrangement according to claim 1, wherein the temperature controller comprises a heater which heats the plurality of ferromagnetic pole elements. 9. The magnetic gear arrangement according to claim 8, wherein the temperature controller comprises wiring that heats selected individual pole elements, a heating current being generated in the wiring through movement of the first and second gear members relative to the wiring. 10. The magnetic gear arrangement according to claim 9, wherein the wiring is electrically connected to one or more electronic filters, the one or more electronic filters selecting the heating current and suppressing current components that would otherwise be generated in the wiring through the movement of the first and second gear members relative to the wiring. 11. The magnetic gear arrangement according to claim 1, wherein the first gear member has permanent magnets for generating the first magnetic field and the second gear member has permanent magnets for generating the second magnetic field. 12. The magnetic gear arrangement according to claim 1, wherein neighbouring pole elements are joined together by non-magnetisable portions of the coupling device. 13. The magnetic gear arrangement according to claim 12, wherein the non-magnetisable portions are formed of an electrically-conductive material. 14. A method of operating a magnetic gear arrangement, the method comprising: (a) providing a magnetic gear arrangement having:a first gear member for generating a first magnetic field,a second gear member for generating a second magnetic field, anda coupling device that provides arrangements of interpoles between the first gear member and the second gear member, the interpoles coupling the first and second magnetic fields such that different arrangements of the interpoles produce different gear ratios between the first and second gear members;wherein:the coupling device comprises a plurality of ferromagnetic pole elements that at leastly partly form the interpoles, each of the plurality of ferromagnetic pole elements having a Curie temperature such that each of the plurality of ferromagnetic pole elements is active below its Curie temperature and inactive above its Curie temperature; and(b) controlling a temperature of at least some of the plurality of ferromagnetic pole elements such that the temperatures of the plurality of ferromagnetic pole elements cross their respective Curie temperatures, and thereby change from active to inactive or the reverse. 15. The magnetic according to claim 14, wherein a different arrangement of the interpoles is provided by the coupling device when the plurality of ferromagnetic pole elements cross their respective Curie temperatures.
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