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US 11,959,977 B2Granted
Systems and methods for fault detection in variable differential transformers
AssigneeHamilton Sundstrand Corporation
InventorGordon Elliott Winer
Life of this patent
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Abstract
In accordance with at least one aspect of this disclosure, a system can include a primary coil wound around a moveable magnetic core, at least one secondary coil wound in one continuous direction and magnetically coupled with the primary coil, and a controller operatively connected to determine a position of the moveable magnetic core and configured to detect a fault across the secondary coil.
Claims12
A system, comprising:
- a primary coil wound around a moveable magnetic core;
- at least one secondary coil wound around the moveable magnetic core in one continuous direction and magnetically coupled with the primary coil;
- and
- a controller operatively connected to determine a position of the moveable magnetic core and configured to detect a fault across the secondary coil,
- wherein the secondary coil includes a first side line, a second side line, and a center-tap, wherein the first side line and the second side line of the at least one secondary coil are 180 degrees out of phase relative to one another, wherein the controller is configured to perform a built-in-test (BIT) to detect the fault across the secondary coil, wherein the controller is configured to sample a voltage of the first side line with respect to the center-tap and a voltage of the second side line with respect to the center-tap and determine a sum voltage of the first side line and the second side line.
2 more elements
A method, comprising:
- detecting a fault in at least one secondary winding of a variable differential transformer across a first side line with respect to a center-tap and a second side line with respect to the center-tap using a sum voltage of the first side line and the second side line;
- and
- outputting a fault detection signal to a user indicting the fault
- wherein the at least one secondary winding includes one secondary winding wound in one direction, wherein the at least one secondary winding includes two secondary windings wound in the same direction relative to one another, sampling a voltage of the first line of the at least one secondary winding with respect to the center-tap;
- wherein detecting the fault includes:
- sampling a voltage of the second side line of the at least one secondary winding with respect to the center-tap;
- and
- summing the voltage of the first side line and the second side line, comparing the sum voltage to a known sum voltage;
- and
- detecting a fault if a difference between the sum voltage of the first side line and the second side line is greater than a predetermined threshold, comparing the sum voltage to a known sum voltage;
- and
- detecting a fault if a difference between the sum voltage of the first side line and the second side line is at or near zero.
9 more elements
Dependencies are inferred from the claim text.