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US 10,948,315 B2Granted
Magnetic position detecting device and method
AssigneeIndustrial Technology Research Institute
InventorsYu-Ming Wang, Chen-Chung Du, Brian Luan Chen, Jen-Yuan Chang, Jwu-Sheng Hu
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Abstract
A magnetic position detecting device and a method for detecting a magnetic position are provided. An induced voltage is generated by changing a position between a pattern of an inductive ruler and an alternating magnetic field of an exciting element. A position of the exciting element is resolved by a technical means of voltage resolution for positions.
Claims14
A magnetic position detecting device, comprising:
- an exciting element configured for generating an alternating magnetic field;
- an inductive ruler with a first pattern and configured for generating an inductive voltage based on a position change between the pattern and the exciting element;
- and
- a position resolving element configured for capturing the inductive voltage and resolving a position of the exciting element on the inductive ruler based on the inductive voltage,
- wherein the position resolving element sequentially comprises an inductive voltage signal processing unit, an analog digital converter, and an inductive voltage position resolving unit,
- wherein the inductive voltage signal processing unit sequentially comprises a first amplifier, a low-pass filter, an envelope detector, a level shifter, and a second amplifier,
- wherein the first amplifier is sequentially connected to the low-pass filter, the envelope detector, the level shifter, the second amplifier, the analog digital converter, and the inductive voltage position resolving unit,
- wherein the position of the exciting element on the inductive ruler is obtained by either equations 1) X=S×TL+X0=S×TL+(Vt−V0)/m or 2) X=S×½(TL)+X0=S×½(TL)+(Vt−V0)/m, and
- wherein X is the position of the exciting element on the inductive ruler, S is a number of periods of an analyzed band, TL is a distance of the periods of the analyzed band, X0 is a distance from a process voltage of a Sth period to X, Vt is a value of the process voltage, V0 is a linear initial voltage value of the Sth period, and m is a slope value of (X, Vt).
6 more elements
A method for detecting a magnetic position, comprising:
- providing an inductive ruler with a first pattern;
- generating an alternating magnetic field by an exciting element;
- generating an inductive voltage based on a position change between the pattern on the inductive ruler and the exciting element;
- and
- capturing, by a position resolving element, the inductive voltage, and resolving a position of the exciting element on the inductive ruler based on the inductive voltage,
- wherein the position resolving element sequentially comprises an inductive voltage signal processing unit, an analog digital converter, and an inductive voltage position resolving unit,
- wherein the inductive voltage signal processing unit sequentially comprises a first amplifier, a low-pass filter, an envelope detector, a level shifter, and a second amplifier,
- wherein the first amplifier is sequentially connected to the low-pass filter, the envelope detector, the level shifter, the second amplifier, the analog digital converter, and the inductive voltage position resolving unit
- wherein the position of the exciting element on the inductive ruler is obtained by either equations 1) X=S×TL+X0=S×TL+(Vt−V0)/m or 2) X=S×½(TL)+X0=S×½(TL)+(Vt−V0)/m, and
- wherein X is the position of the exciting element on the inductive ruler, S is a number of periods of an analyzed band, TL is a distance of the periods of the analyzed band, X0 is a distance from a process voltage of a Sth period to X, Vt is a value of the process voltage, V0 is a linear initial voltage value of the Sth period, and m is a slope value of (X, Vt).
7 more elements
Dependencies are inferred from the claim text.