Stator wound resolver with staggered rotor
First Claim
1. A stator wound resolver comprising:
- a stator and a rotor aligned on an axis;
said stator having a plurality of teeth with input and output windings disposed on a number of said teeth, said input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about said axis;
said input winding being connectable to a drive signal and said output windings being disposed on said teeth such that output signals induced in said output windings correspond to position of the rotor;
said rotor being attachable to a position changing means, said rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle;
said stagger angle being based on at least two magnitude measurements of mutual inductance harmonic distortion, each said measurement being taken using a different stagger angle, wherein said rotor pieces are offset at an optimum stagger angle at which two components of mutual inductance harmonic distortion substantially cancel each other to reduce distortion in the resolver output signals.
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Accused Products
Abstract
A stator wound resolver comprising: a stator and a rotor aligned on an axis; the stator having a plurality of teeth with input and output windings disposed on some or all of the teeth, the input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about the axis; the input winding being connectable to a drive signal and the output windings being disposed on the teeth such that output signals induced in the output windings correspond to position of the rotor; the rotor being attachable to a position changing means, the rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle such that a portion of harmonic distortion produced by one of the rotor pieces is reduced by complementary harmonic distortion produced by another of the rotor pieces.
100 Citations
16 Claims
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1. A stator wound resolver comprising:
- a stator and a rotor aligned on an axis;
said stator having a plurality of teeth with input and output windings disposed on a number of said teeth, said input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about said axis;
said input winding being connectable to a drive signal and said output windings being disposed on said teeth such that output signals induced in said output windings correspond to position of the rotor;
said rotor being attachable to a position changing means, said rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle;
said stagger angle being based on at least two magnitude measurements of mutual inductance harmonic distortion, each said measurement being taken using a different stagger angle, wherein said rotor pieces are offset at an optimum stagger angle at which two components of mutual inductance harmonic distortion substantially cancel each other to reduce distortion in the resolver output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- a stator and a rotor aligned on an axis;
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14. A method for reducing harmonic distortion in the output signals of a stator wound resolver comprising the steps of:
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a. using a first rotor that has a radius that varies in a sinusoidal manner to vary mutual inductance between input and output windings on the stator as a function of rotor position; b. producing output signals from the resolver output windings as a function of said mutual inductance; and c. using a second rotor that is axially spaced from said first rotor and offset by an optimum stagger angle to produce complementary harmonic signals that reduce harmonic distortion in the resolver output signals;
said optimum stagger angle being selected based on at least two magnitude measurements of mutual inductance harmonic distortion, each said measurement being taken using a different stagger angle.
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15. In a stator wound resolver of the type having a rotor concentrically disposed within a stator, said stator having a plurality of teeth with input and output windings disposed on a number of said teeth, said input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about said axis, the improvement comprising said rotor having a number of axially spaced pieces that are offset from each other by a stagger angle with a portion of harmonic distortion produced by one of said rotor pieces being reduced by harmonic distortion produced by another of said rotor pieces;
- said rotor pieces being offset at an optimum stagger angle that is based on at least two magnitude measurements of mutual inductance harmonic distortion, each said measurement being taken using a different stagger angle.
- View Dependent Claims (16)
Specification