Linear variable phase transformer with constant magnitude output
AssigneePneumo Corporation
InventorsMichael A. Pauwels, Dan O. Bauer
Life of this patent
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Abstract
A linear variable phase transformer position to phase transducer produces a linear phase change in an output signal with respect to displacement. Moreover, the magnitude of such output signal remains relatively constant while such displacement occurs. The transducer includes two primaries which are specially wound according to sine and cosine functions and are excited out of phase, a secondary, and a core that combines the primary signals and induces the output signal in the secondary according to the core position relative to the primaries.
Claims19
A displacement to phase transducer, comprising plural primary means for producing in response to alternating current excitation alternating magnetic fluxes, combining means for producing an output flux having a phase dependent on the relative positions of said combining means and said primary means, at least one of said combining means and primary means being movable relative to the other, and output means for producing an output AC electrical signal having a substantially constant magnitude and a phase corresponding to the phase of said output flux, and wherein each primary means includes plural axially displaced, coaxial segments and segments of one primary means overlap respective segments of a second primary means.
A displacement to phase transducer, comprising plural primary means for producing in response to alternating current excitation alternating magnetic fluxes, combining means for producing an output flux having a phase dependent on the relative positions of said combining means and said primary means, at least one of said combining means and primary means being movable relative to the other, and output means for producing an output AC electrical signal having a substantially constant magnitude and a phase corresponding to the phase of said output flux, wherein the transducer has an axis, each primary means includes a plurality of generally circumferential winding turns distributed along said axis according to a sinusoidal function of position along said axis, and said primary means are coaxial and overlapping.
A displacement to phase transducer, comprising plural primary means for producing in response to alternating current excitation alternating magnetic fluxes, combining means for producing an output flux having a phase dependent on the relative positions of said combining means and said primary means, at least one of said combining means and primary means being movable relative to the other, and output means for producing an output AC electrical signal having a substantially constant magnitude and a phase corresponding to the phase of said output flux, further comprising an elongate axis, wherein said primary means each includes pural generally circumferential winding turns distributed along the axial length of said axis according to the sinusoidal function of position, a hollow interior passage being circumscribed by said primary means, and wherein said combining means comprises a magnetically permeable core relatively movable in said interior along said axis.
A displacement to phase transducer, comprising plural segmental and generally coaxial primary means for producing in response to alternating current excitation alternating magnetic fluxes, wherein segments of one primary means overlap respective segments of another primary means, combining means for producing an output flux having a phase dependent on the relative positions of said combining means and said primary means, at least one of said combining means and primary means being movable relative to the other, and output means for producing an output AC electrical signal having a phase corresponding to the phase of said output flux.
Dependencies are inferred from the claim text.