Reducing inductive heating
First Claim
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1. An audio transducer apparatus comprising:
- a magnet assembly comprising at least two magnet assembly components, where a first one of the components has a first material, where the magnet assembly is part of the audio transducer apparatus;
a heating reduction system configured to reduce induced heating in the first component, where the heating reduction system comprises a member at least partially surrounding the magnet assembly, where the member comprises a material which has an electrical conductivity that is higher than an electrical conductivity of the first material to thereby reduce induced heating in the first component by a field from outside the magnet assembly; and
a heat transfer member extending from the member of the heating reduction system, where the heat transfer member is configured to transfer heat away from the member of the heating reduction system, where the heat transfer member comprises a ground plane of a printed wiring board of an apparatus.
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Abstract
An audio transducer apparatus including a component having a first material; and a heating reduction system configured to reduce induced heating in the component. The heating reduction system includes a member at least partially surrounding the component. The member includes a material which has an electrical conductivity that is higher than an electrical conductivity of the first material to thereby reduce induced heating in the component.
18 Citations
13 Claims
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1. An audio transducer apparatus comprising:
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a magnet assembly comprising at least two magnet assembly components, where a first one of the components has a first material, where the magnet assembly is part of the audio transducer apparatus; a heating reduction system configured to reduce induced heating in the first component, where the heating reduction system comprises a member at least partially surrounding the magnet assembly, where the member comprises a material which has an electrical conductivity that is higher than an electrical conductivity of the first material to thereby reduce induced heating in the first component by a field from outside the magnet assembly; and a heat transfer member extending from the member of the heating reduction system, where the heat transfer member is configured to transfer heat away from the member of the heating reduction system, where the heat transfer member comprises a ground plane of a printed wiring board of an apparatus. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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providing a magnet assembly comprising at least two magnet assembly components, a first one of the components comprising a first material susceptible to heating by induced eddy currents from fields, where the magnet assembly is part of an audio transducer; connecting a heating reduction system to the magnet assembly, where the heating reduction system is configured to reduce heating in the first component, where the heating reduction system comprises a member at least partially surrounding the magnet assembly, where the member comprises a material which has an electrical conductivity that is higher than an electrical conductivity of the first material to reduce heating in the first component by a field from outside the magnet assembly; providing a heat transfer member extending from the member of the heating reduction system, where the heat transfer member is configured to transfer heat away from the member of the heating reduction system; and connecting the heat transfer member to a ground plane of a printed wiring board. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus comprising:
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a housing; a rechargeable battery in the housing; an induction charging system in the housing coupled to the rechargeable battery; an audio transducer comprising a magnet assembly in the housing, where the magnet assembly comprises at least two magnet assembly components, where a first one of the components comprises a first material susceptible to heating by induced eddy currents from induction charging fields generated externally from the apparatus; an eddy current heating reduction system configured to reduce induced eddy current heating in the first component by the induction charging fields, where the eddy current heating reduction system comprises a member at least partially surrounding the magnet assembly, where the member comprises a second material which has an electrical conductivity that is higher than an electrical conductivity of the first material, where the member is configured to allow an induced current density to be formed in the member from the induction charging fields from outside the magnet assembly which is higher than an induced current density formed in the first component from the induction charging fields to reduce induced eddy current heating in the first component by the induction charging fields; and a heat transfer member extending from the member of the eddy current heating reduction system, where the heat transfer member is configured to transfer heat away from the member of the eddy current heating reduction system, where the heat transfer member comprises a ground plane of a printed wiring board of an apparatus.
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Specification