Patent ID: 8408230

Claim:
An VP converter, comprising: a flexure ( 1 ); a magnetic circuit comprising: an inner core ( 6 ) including a nozzle bore, a substantially cylindrical portion, and a flange extending substantially radially outwardly from the substantially cylindrical portion; an annular outer core ( 4 ) including an aperture that fits over a least a portion of the inner core ( 6 ) and is substantially coaxial with the inner core ( 6 ); and an annular magnet ( 5 ) sandwiched between the outer core ( 4 ) and the flange of the inner core ( 6 ); a nozzle ( 7 ) having a first end, where the nozzle ( 7 ) is received in the nozzle bore of the inner core ( 6 ) and is coupled to the magnetic circuit at a first location; and a temperature compensation ring ( 3 ) coupled to the annular outer core ( 4 ) of the magnetic circuit and to the flexure ( 1 ), where the temperature compensation ring ( 3 ) comprises a sole support for the flexure ( 1 ) and is configured to maintain the relative position between the nozzle ( 7 ) and the flexure ( 1 ) over a range of temperatures, wherein a temperature compensation ring coefficient of thermal expansion is higher than an inner core coefficient of thermal expansion and wherein a temperature compensation ring thermal expansion/contraction cancels out a magnet thermal expansion/contraction.