position sensor

By using a capacitively designed motor position sensor to measure angular position through the capacitance change between the rotor and stator segments, the balance between cost and robustness of existing sensors is solved, achieving a high-precision and low-cost sensor solution.

CN122305892APending Publication Date: 2026-06-30SESATA SCI & TECH CHANGZHOU CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SESATA SCI & TECH CHANGZHOU CO LTD
Filing Date
2024-12-30
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing motor position sensors struggle to balance cost and robustness, leading to increased maintenance and operating costs, and are sensitive to environmental and mechanical misalignment.

Method used

Employing a capacitive design, the angular position of the rotating element is measured by the periodic capacitance change between the rotor and stator sections. The processing module converts the capacitance change into precise position data, simplifying calculations and reducing sensitivity to deviations and temperature changes.

Benefits of technology

Providing high-precision, robust, and cost-effective sensors that are less sensitive to mechanical misalignment and temperature changes, these sensors have become a competitive alternative to other sensor types, improving their competitiveness and profit margins.

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Abstract

This application discloses a position sensor comprising: a first detection element including a set of first detection segments and a set of second detection segments arranged partially along a circumferential direction; and a second detection element, arranged opposite to and spaced apart from the first detection element, and including a set of third detection segments arranged partially along a circumferential direction. A first detection capacitance is defined between the third detection segments and the first detection segments, and a second detection capacitance is defined between the third detection segments and the second detection segments. The first and second detection capacitances change periodically when the first and second detection elements rotate relative to each other. The first detection segments are offset by a detection angle relative to the second detection segments along the circumferential direction, causing a phase shift in the first detection capacitance relative to the second detection capacitance. This application also relates to a method for measuring the angular position of a rotating element using a position sensor.
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