Power coupling device
First Claim
1. A power coupling device for coupling power to a rotating member, said power coupling device comprising:
- a. a primary magnetic core including a primary winding;
b. a secondary magnetic core including a secondary winding;
wherein said primary and secondary cores are arranged so as to form an air gap therebetween, said air gap permitting relative rotation of said cores about an axis of rotation while allowing power to be transferred across the air gap, and wherein at least one of said primary and said secondary windings comprises a fractional turn winding;
c. conductive shielding configured as two continuous, circular half toroidal shells, each shell surrounding a respective one of the primary and secondary cores except for a portion adjacent the air gap, wherein when power is transferred across the air gap, oscillating magnetic fields will induce currents in the shielding, which induced currents tend to cancel the oscillating magnetic fields in a region outside the shielding.
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Accused Products
Abstract
A power coupling device for coupling power to a rotating member includes a primary magnetic core defining a first recess, and a secondary magnetic core defining a second recess and disposed adjacent the primary magnetic core. The primary and secondary cores are arranged so as to form an air gap therebetween. The air gap permits relative rotation of the cores about a common axis of rotation. A primary conductive winding is disposed within the first recess, and a secondary conductive winding is disposed within the second recess. At least one of the primary and secondary windings is a fractional turn winding, thereby enabling the transfer of power between multiple input and output voltages. Shielding is provided by a pair of continuous, circular, semi-toroidal shells arranged to support the currents needed to cancel the fields from the transformer.
71 Citations
27 Claims
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1. A power coupling device for coupling power to a rotating member, said power coupling device comprising:
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a. a primary magnetic core including a primary winding; b. a secondary magnetic core including a secondary winding; wherein said primary and secondary cores are arranged so as to form an air gap therebetween, said air gap permitting relative rotation of said cores about an axis of rotation while allowing power to be transferred across the air gap, and wherein at least one of said primary and said secondary windings comprises a fractional turn winding; c. conductive shielding configured as two continuous, circular half toroidal shells, each shell surrounding a respective one of the primary and secondary cores except for a portion adjacent the air gap, wherein when power is transferred across the air gap, oscillating magnetic fields will induce currents in the shielding, which induced currents tend to cancel the oscillating magnetic fields in a region outside the shielding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A rotary transformer system comprising:
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a. a primary transformer portion including a primary winding; b. a secondary transformer portion including a secondary winding; wherein the first and second transformer portions are configured so as to rotate relative to one another; and electrically conductive shielding as two continuous, circular half toroidal shells, each shell surrounding a respective one of the primary and secondary transformer portions except for a portion adjacent the air gap, wherein the shielding is arranged so as to substantially cancel oscillating magnetic fields generated when power is transferred between the primary transformer portion and the secondary transformer portion, and wherein at least one of said primary and said secondary windings comprises a fractional turn winding. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification