Rotary transformers for electrical machines
AssigneeHamilton Sundstrand Corporation
InventorYang Wang
Life of this patent
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Abstract
A rotary transformer includes a shaft, a stator, and a rotor. The stator has a pole surface extending about the shaft. The rotor has a pole surface and operatively connects to the shaft for common rotation with the shaft such that the pole surface of the rotor axially opposes the pole surface of the rotor at an overlap area. The overlap are between the pole surfaces is greater at a first rotor position that at a second rotor position for superimposing a signal indicative of rotor position on electrical power transferred between the stator and rotor.
Claims10
A rotary transformer, comprising:
- a shaft;
- a stator with a pole surface extending about the shaft;
- and
- a rotor with a pole surface operatively connected to the shaft for common rotation therewith such that the pole surface of the rotor axially opposes pole surface of the stator at an overlap area,
- wherein the overlap area between the pole surface of the rotor and the pole surface of the stator is greater in a first rotor position than in a second position,
- wherein a periphery of the rotor pole surface defines an ellipse arranged orthogonally with respect to the shaft,
- wherein a periphery of the stator pole surface defines an ellipse axially opposing pole surface of the rotor.
A rotary transformer, comprising:
- a shaft;
- a stator with a pole surface extending about the shaft;
- and
- a rotor with a pole surface operatively connected to the shaft for common rotation therewith such that the pole surface of the rotor axially opposes pole surface of the stator at an overlap area,
- wherein the overlap area between the pole surface of the rotor and the pole surface of the stator is greater in a first rotor position than in a second position,
- wherein the stator is a first stator and further including a second stator with a pole surface, wherein the second stator axially opposes the rotor,
- wherein the pole surface of the first stator is offset from the pole surface of the second stator by 90 degrees relative to a rotation axis of the shaft.
An exciter, comprising:
- a shaft operatively connected to a rotor of an electrical machine;
- a stator with a pole surface extending about the shaft;
- and
- a rotor with a pole surface operatively connected to the shaft for common rotation therewith such that the pole surface of the rotor axially opposes the pole surface of the stator at an oblong overlap area, wherein the overlap area between the pole surface of the rotor and the pole surface of the stator is greater in a first position than in a second position,
- wherein the stator is a first stator and further including a second stator with a stator pole surface, wherein the second stator pole surface axially opposes the rotor surface opposite the surface having the rotor pole,
- wherein the pole surface of the first stator is offset from the pole surface of the second stator by 90 degrees relative to a rotation axis of the shaft.
Dependencies are inferred from the claim text.