Patent ID: 6437472
Filing Date: 2002-08-20
Classification: H01F,Y10S

Abstract:
An apparatus for wireless transfer of power to a rotating element comprising:a stationary assembly; a rotating assembly which rotates relative to said stationary assembly, said rotating assembly including a secondary induction assembly having a secondary core and a secondary winding; a stationary assembly including a motor, and a motor shaft, which drive rotation of said rotating assembly relative to said stationary assembly; a magnetic induction device including a primary induction assembly mounted on said stationary assembly, said primary induction assembly having a primary winding, such that when said primary induction assembly is aligned with said secondary induction assembly and an alternating current is passed through said primary winding of said primary induction assembly, a secondary alternating current is induced in said secondary winding of said secondary induction assembly; said motor shaft includes first and second portions, said first portion of said motor shaft being surrounded by said primary winding of said primary induction assembly, and said second portion of said motor shaft being surrounded by said secondary winding of said secondary induction assembly such that when alternating electric current is passed through said primary winding of said primary induction assembly, a magnetic flux is induced in said motor shaft, said magnetic flux extending from said first motor shaft portion into said second motor shaft portion, which then induces an alternating electric current in said secondary winding of said secondary induction assembly; a converter for converting the induced alternating current to direct current; and an electrical storage device which stores electric power.