Position sensing for moveable mechanical systems and associated methods and apparatus
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01B-007/30
G01B-007/14
출원번호
US-0084969
(2005-03-21)
발명자
/ 주소
Mock,M. Robert
Sweer,Grant
출원인 / 주소
HR Textron, Inc.
대리인 / 주소
BainwoodHuang
인용정보
피인용 횟수 :
67인용 특허 :
2
초록▼
Position sensing of movable elements including but not limited to machine components is disclosed. Motion of a movable element can produce motion of a magnetic field, which can be detected by magnetic sensors. The motion and/or variations of a magnetic field and/or a magnetic flux may be produced by
Position sensing of movable elements including but not limited to machine components is disclosed. Motion of a movable element can produce motion of a magnetic field, which can be detected by magnetic sensors. The motion and/or variations of a magnetic field and/or a magnetic flux may be produced by any combination of a motion of the sensors, associated magnets, or associated magnetic material. Magnetic sensors may be capable of measuring either rotary, or linear motion, or both. Such sensors can provide indication of an incremental position change, an absolute position, or both. Absolute position and high-resolution position sensing may be produced for measurement of either linear and/or angular motion. Suitable magnetic sensors include, but are not limited to, Hall effect devices and/or magneto-resistive elements, and may include multi-element magnetic sensors. Suitable signal conditioning and/or control means such as control electronics can be used to receive output signals from the sensors.
대표청구항▼
What is claimed is: 1. A position sensing system for a drive train having a plurality of moveable drive elements, said system comprising: a plurality of magnets, wherein each of said plurality of magnets is affixed to a corresponding one of said plurality of moveable drive element of said drive tra
What is claimed is: 1. A position sensing system for a drive train having a plurality of moveable drive elements, said system comprising: a plurality of magnets, wherein each of said plurality of magnets is affixed to a corresponding one of said plurality of moveable drive element of said drive train; a plurality of magnetic sensors, wherein each of said plurality of magnetic sensors is configured and operable to detect a change in magnetic flux density produced by motion of a magnetic field produced by a corresponding one of said plurality of magnets and each of said magnetic sensors is operable to produce an output signal corresponding to said change in magnetic flux density due to the motion of each corresponding moveable drive element; and control means connected to said plurality of magnetic sensors, said control means being operable to determine a position of one or more of the plurality of moveable drive elements as a function of said plurality of output signals, and wherein each of said plurality of output signals is a component of a combined signal. 2. The system of claim 1, wherein said plurality of magnets comprise multiple-poled magnets. 3. The system of claim 2, wherein said plurality of magnets comprise eight-poled magnets. 4. The system of claim 1, wherein one of said plurality of magnetic sensors comprises a multi-element magnetic sensor. 5. The system of claim 1, wherein said control means is operable to produce a control signal as an output. 6. The system of claim 4, wherein said multi-element magnetic sensor comprises a plurality of magneto-resistive elements. 7. The system of claim 6, wherein said plurality of magneto-resistive elements comprises four magneto-resistive elements configured electrically in a bridge configuration. 8. The system of claim 7, wherein said bridge configuration is a Wheatstone bridge. 9. The system of claim 4, wherein said multi-element magnetic sensor comprises a plurality of Hall effect elements. 10. The system of claim 9, wherein said plurality of Hall effect elements comprise proportional Hall effect elements. 11. The system of claim 9, wherein said plurality of Hall effect elements comprise digital Hall effect elements. 12. The system of claim 10, wherein said plurality of Hall effect elements comprise four proportional Hall effect elements configured and arranged in an IC. 13. The system of claim 1, further comprising a high-resolution magnetic sensor and a plurality of high-resolution magnets having alternating north and south magnetic poles arranged in a first configuration, wherein said plurality of high-resolution magnets are affixed to one of said plurality of moveable drive elements, and wherein said high-resolution magnetic sensor is operable to measure magnetic field variations produced by motion of said plurality of high-resolution magnet during motion of said moveable element. 14. The system of claim 13, further comprising a toothed magnetic flux guide adjacent to said high-resolution magnetic sensor and operable to channel magnetic flux from said plurality of high-resolution magnets to said high-resolution magnetic sensor. 15. The system of claim 13, wherein said high-resolution magnetic sensor comprises a magneto-resistive element. 16. The system of claim 13, wherein said high-resolution magnetic sensor comprises an analog Hall effect element. 17. The system of claim 13, wherein said high-resolution magnetic sensor comprises a digital Hall effect element. 18. The system of claim 13, wherein said first configuration is a ring. 19. The system of claim 13, wherein said first configuration is a linear array. 20. The system of claim 1, further comprising a flux guide affixed to said moveable element and operable to modulate magnetic flux of one of said plurality of magnetic sensors. 21. The system of claim 1, wherein said plurality of drive train elements includes a rotatable shaft, and wherein one of said plurality of magnetic sensors comprises a magnetic quadrature sensor including two pairs of magnetic yokes adapted to the circumference of said shaft, wherein said shaft includes a plurality of magnets, and wherein a respective magnetic sensor of said multi-element magnetic sensor is disposed between and ends of a respective pair of said two pairs of magnetic yokes, wherein said magnetic quadrature sensor is operable to detect motion of said shaft and to produce as an output a quadrature signal corresponding to said motion. 22. The system of claim 21, wherein said control means comprise an electronic control unit operable to receive said quadrature signal from said magnetic quadrature sensor and to provide a sine wave quadrature decoding for said quadrature signal to determine a position of said shaft. 23. The system of claim 21, wherein said magnetic yokes comprise a paramagnetic magnetic material. 24. The system of claim 1, wherein said magnet comprises a magnetic material selected from the group consisting of iron, nickel, cobalt, dysprosium, and gadolinium. 25. The system of claim 1, wherein said control means includes an electronic controller coupled to said plurality of magnetic sensors and operable to receive said output signals therefrom. 26. The system of claim 1, wherein one of said plurality of magnetic sensors comprises a magnetic quadrature sensor and wherein said control means comprise an electronic control unit operable to receive said quadrature signal from said magnetic quadrature sensor and to provide a sine wave quadrature decoding for said quadrature signal to determine a position of at least one of said plurality of moveable drive elements of said drive train.
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