US20010005133A1 - Non-contact linear position sensor for motion control applications - Google Patents
Non-contact linear position sensor for motion control applications Download PDFInfo
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- US20010005133A1 US20010005133A1 US09/764,840 US76484001A US2001005133A1 US 20010005133 A1 US20010005133 A1 US 20010005133A1 US 76484001 A US76484001 A US 76484001A US 2001005133 A1 US2001005133 A1 US 2001005133A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2053—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element
Definitions
- the present invention is directed to a non-contact linear position sensor for motion control applications.
- position sensors In order to meet the current stringent reliability and meantime before failure (MTBF) requirements demanded by the automotive, industrial and aerospace industries, position sensors must be based on a non-contact design approach. For automotive use, the design must be suited for low cost, high volume, and high reliability.
- the above parent application discloses and claims an angular position sensor which is useful, for example, in the automotive field for determining the rotation of a steering column.
- This same type of non-contacting position sensor can also be adapted to measure the torque in a steering column as disclosed in a co-pending application Ser. No. 09/527,088, filed Mar. 16, 2000, entitled, NON-CONTACTING TORQUE SENSOR and assigned to the present Assignee.
- a linear position sensor for example, one that may be used with a voice-coil actuator in order to provide built-in feedback control for motion control applications.
- a position sensor for sensing rectilinear movement of an object along an axis comprising a pair of spaced substantially rectilinear radio transmit and receive sections juxtaposed on the axis facing each other with a coupler section between them, the coupler being movable along the axis and connected to the object.
- the receive section carries a predetermined number of independent inductive coils segmentally arranged in a rectilinear pattern along the receive section.
- the transmit section carries coil means in a rectilinear pattern similar to the receive section and is driven by a signal source at a predetermined radio frequency for inductive coupling to the coils of the receive section.
- the coupler section carries at least one symmetrical conductive pattern for attenuating the inductive coupling, the pattern having linear positions of maximum and minimum attenuation with respect to any one of a plurality of inductive coils carried by the receive section, intermediate positions of the pattern between the maximum and minimum providing substantially proportionate attenuations.
- Means connected to the coils carried by the receive section demodulate and sum induced transmitted signals from the signal source for each linear position of the coupler, the summation producing a substantially sinusoidal waveform whose phase shift varies in proportion to the linear movement coupler section. Means are provided for sensing the phase shift.
- FIG. 1 is a plan view of both the transmit and receive portions of an angular position sensor as disclosed in the above parent application.
- FIG. 2 is a plan view of a coupler disk as used in the angular position sensor of the above parent application in conjunction with the transmit and receive portions of FIG. 1.
- FIG. 3A is a simplified plan view of a transmitter section of the present invention.
- FIG. 3B is a simplified plan view of a slider or coupler section of the present invention.
- FIG. 3C is a simplified plan view of receiver section of the present invention.
- FIG. 4 is a simplified circuit schematic illustrating the present invention.
- FIG. 5 is a detailed schematic of a portion of FIG. 4.
- FIG. 6A, 6B, 6 C and 6 D are wave forms illustrating the operation of the invention.
- FIG. 7 is a cross-sectional view of a voice coil actuator incorporating the position sensor of the present invention.
- FIG. 8 is a end view taken along the line 8 / 8 of FIG. 7.
- FIG. 9A is another illustration of FIG. 3B.
- FIG. 9B is the characteristic curve of the electrical output provided by FIG. 9A.
- FIG. 9C is an alternate embodiment of FIG. 9A.
- FIG. 9D is a characteristic output of the alternate embodiment shown in FIG. 9C.
- FIG. 9E is an alternate embodiment of FIG. 9A.
- FIG. 9F is a characteristic output of the alternate embodiment shown in FIG. 9E.
- FIGS. 1 and 2 illustrate the angular position sensor of the parent application where the disk 10 illustrates both the transmit and receive sections or disks which contains six identical loop antenna coils designated for the transmit portion T 1 -T 6 and for the receive section R 1 -R 2 .
- a coupler disk 11 as illustrated in FIG. 2 is sandwiched between the transmit and receive disks and rotation of the crescent-shaped conductive portion of the coupler disk causes a phase shift in the signals from the receive coils which is proportional to rotary or angular displacement. As illustrated in FIG. 1, the coils are spaced 60° apart.
- FIG. 3A is a transmitter section 13 having six inductive coils T 1 -T 6 arranged in a rectilinear patten with a total distance L a with a width of L b .
- a similar rectilinear receive section 14 FIG. 3C, has similar receive coils R 1 -R 6 and includes a specialized electronics integrated circuit unit 15 to provide output voltages designated R out for each receive coil.
- a slider on coupler section 12 having substantially symmetrical diamond shaped coupler patterns 51 and 52 (see FIG. 3B) which are conductive with a nominal length of each pattern being designated L c .
- movement of the coupler section in the direction 53 attenuates the inductive coupling between transmitter and receiver sections 13 and 14 to produce an output signal (to be discussed below) whose phase shift varies with the amount of attenuation, which is proportionate to linear displacement.
- FIG. 9A shows the coupler section 12 and the electrical signal output related to the distance L c is illustrated as a straight line in FIG. 9B.
- the total length of the slider section 12 is as illustrated equal to L c plus L a .
- L c is equal or less than L a .
- FIG. 4 illustrates the transmitter and receiver sections 13 and 14 with the slider or coupler section 12 interposed, which will move in a linear manner as indicated by the arow 53 , in association with the electrical signal processing circuit.
- a signal source 17 supplies a signal, F c to the coils of the transmit section 13 which are inductively coupled to receive section 14 and attenuated by the slider section 12 .
- Signal 17 is also connected to a digital mixer and waveform generator 16 which also has as an input 31 , the six receive coils, on output line 32 , a set (S) signal is suppled to an RS flipflop.
- FIGS. 6A, 6B, 6 C and 6 D which represents four different linear positions of the coupler or slider. Their phase shift is proportional to the linear position of the coupler or slider.
- comparator to A 3 then converts these waveforms to a square wave at output 36 which drives the R input of the RS flipflop. This produces a pulse width modulator (PWM) output where the width of the pulse is exactly proportional to the amount of movement of the slider.
- Filter A 4 provides an alternative analog output.
- FIG. 5 illustrates the digital mixer and waveform generator 16 and how it is related to the transmitter and receive coils 13 and 14 , including being driven by six local oscillator signals L 01 -L 06 which are shifted in phase from one another by 60°, i.e., by the number of receive coils cited in 360°. The foregoing is more totally explained in conjunction with the parent application.
- FIGS. 7 and 8 An actual practical example of the position sensor of the present invention for measuring the displacement of a voice coil actuator is illustrated in FIGS. 7 and 8, where FIG. 7 is a voice coil actuator 61 incorporating the position sensor and FIG. 8 shows the position sensor with its transmit section 13 , slider or coupler section 12 and receiver section 14 incorporated in the actuator.
- the transmitter and receiver are, of course, affixed to the frame 62 of the voice coil actuator with coupler or slider 12 as best illustrated in FIG. 7 being connected only to coil holder 63 , which moves in the direction as indicated by the arrow 64 . It would be coupled to an actuated device such as the valve lifter of a diesel engine or some control device to control vehicle height.
- Movable coil holder 63 of actuator 61 includes a tubular coil 66 wrapped around it which interacts with the cylindrical ferromagnetic permanent magnet 67 through the air gap 68 in a manner well known in the art.
- the fixed outer frame 62 of the voice coil actuator is composed of soft iron for a flux return and is, of course, cylindrical in shape.
- the voice coil actuator may be used in conjunction with built in feedback control.
- FIGS. 9 in their various forms, as was discussed the diamond shape of the symmetrical pattern on the slider section 12 illustrated in FIG. 9A results in the linear pattern of FIG. 9B. If a second order characteristic is desired at either one end or the other end of movement of the slider 12 , as illustrated in either FIGS. 9D and 9F, then the patterns of FIGS. 9 C, and 9 E, respectively, may be provided where in FIG. 9C the rate of change toward the maximum of the pattern is greater and in 9 E the rate of change at the beginning of the pattern is greater.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
- This is a continuation-in-part of U.S. patent application Ser. No. 09/390,885, filed Sep. 7, 1999, entitled ANGULAR POSITION SENSOR WITH INDUCTIVE ATTENUATING COUPLER.
- The present invention is directed to a non-contact linear position sensor for motion control applications.
- In order to meet the current stringent reliability and meantime before failure (MTBF) requirements demanded by the automotive, industrial and aerospace industries, position sensors must be based on a non-contact design approach. For automotive use, the design must be suited for low cost, high volume, and high reliability. The above parent application discloses and claims an angular position sensor which is useful, for example, in the automotive field for determining the rotation of a steering column. This same type of non-contacting position sensor can also be adapted to measure the torque in a steering column as disclosed in a co-pending application Ser. No. 09/527,088, filed Mar. 16, 2000, entitled, NON-CONTACTING TORQUE SENSOR and assigned to the present Assignee. However, there is still a need for a linear position sensor, for example, one that may be used with a voice-coil actuator in order to provide built-in feedback control for motion control applications.
- It is therefore a general object of the present invention to provide a non-contact linear position sensor for motion control applications.
- In accordance with the above object there is provided a position sensor for sensing rectilinear movement of an object along an axis comprising a pair of spaced substantially rectilinear radio transmit and receive sections juxtaposed on the axis facing each other with a coupler section between them, the coupler being movable along the axis and connected to the object. The receive section carries a predetermined number of independent inductive coils segmentally arranged in a rectilinear pattern along the receive section. The transmit section carries coil means in a rectilinear pattern similar to the receive section and is driven by a signal source at a predetermined radio frequency for inductive coupling to the coils of the receive section. The coupler section carries at least one symmetrical conductive pattern for attenuating the inductive coupling, the pattern having linear positions of maximum and minimum attenuation with respect to any one of a plurality of inductive coils carried by the receive section, intermediate positions of the pattern between the maximum and minimum providing substantially proportionate attenuations. Means connected to the coils carried by the receive section demodulate and sum induced transmitted signals from the signal source for each linear position of the coupler, the summation producing a substantially sinusoidal waveform whose phase shift varies in proportion to the linear movement coupler section. Means are provided for sensing the phase shift.
- FIG. 1 is a plan view of both the transmit and receive portions of an angular position sensor as disclosed in the above parent application.
- FIG. 2 is a plan view of a coupler disk as used in the angular position sensor of the above parent application in conjunction with the transmit and receive portions of FIG. 1.
- FIG. 3A is a simplified plan view of a transmitter section of the present invention.
- FIG. 3B is a simplified plan view of a slider or coupler section of the present invention.
- FIG. 3C is a simplified plan view of receiver section of the present invention.
- FIG. 4 is a simplified circuit schematic illustrating the present invention.
- FIG. 5 is a detailed schematic of a portion of FIG. 4.
- FIG. 6A, 6B,6C and 6D are wave forms illustrating the operation of the invention.
- FIG. 7 is a cross-sectional view of a voice coil actuator incorporating the position sensor of the present invention.
- FIG. 8 is a end view taken along the
line 8/8 of FIG. 7. - FIG. 9A is another illustration of FIG. 3B.
- FIG. 9B is the characteristic curve of the electrical output provided by FIG. 9A.
- FIG. 9C is an alternate embodiment of FIG. 9A.
- FIG. 9D is a characteristic output of the alternate embodiment shown in FIG. 9C.
- FIG. 9E is an alternate embodiment of FIG. 9A.
- FIG. 9F is a characteristic output of the alternate embodiment shown in FIG. 9E.
- Referring now to FIGS. 1 and 2 these illustrate the angular position sensor of the parent application where the
disk 10 illustrates both the transmit and receive sections or disks which contains six identical loop antenna coils designated for the transmit portion T1-T6 and for the receive section R1-R2. A coupler disk 11 as illustrated in FIG. 2 is sandwiched between the transmit and receive disks and rotation of the crescent-shaped conductive portion of the coupler disk causes a phase shift in the signals from the receive coils which is proportional to rotary or angular displacement. As illustrated in FIG. 1, the coils are spaced 60° apart. - The present invention utilizes the above principle to measure linear displacement. Thus, FIG. 3A is a
transmitter section 13 having six inductive coils T1-T6 arranged in a rectilinear patten with a total distance La with a width of Lb. A similarrectilinear receive section 14, FIG. 3C, has similar receive coils R1-R6 and includes a specialized electronics integratedcircuit unit 15 to provide output voltages designated Rout for each receive coil. Then juxtaposed between the transmitter andreceiver sections coupler section 12 having substantially symmetrical diamond shapedcoupler patterns 51 and 52 (see FIG. 3B) which are conductive with a nominal length of each pattern being designated Lc. Thus, movement of the coupler section in thedirection 53 attenuates the inductive coupling between transmitter andreceiver sections - FIG. 9A shows the
coupler section 12 and the electrical signal output related to the distance Lc is illustrated as a straight line in FIG. 9B. To generate an effective signal, generally the total length of theslider section 12 is as illustrated equal to Lc plus La. Thus thepatterns section slider section 12, a cycle counter is required to identify the effective revolutions or repetitions. This insures that the transmitter and receiver are exposed to the total length of the pattern on theslider section 12 at all times. - FIG. 4 illustrates the transmitter and
receiver sections coupler section 12 interposed, which will move in a linear manner as indicated by the arow 53, in association with the electrical signal processing circuit. Asignal source 17 supplies a signal, Fc to the coils of the transmitsection 13 which are inductively coupled to receivesection 14 and attenuated by theslider section 12.Signal 17 is also connected to a digital mixer andwaveform generator 16 which also has as aninput 31, the six receive coils, onoutput line 32, a set (S) signal is suppled to an RS flipflop. - Since the coupler or slider section will interrupt and attenuate the signal amplitudes based on the coupler pattern with respect to the position of each receiver coil, six different amplitude signals are simultaneously generated by an amplifier A1 and then input through a lowpass filter and limiting amplifier A2. The output signal of amplifier A2 is illustrated in FIGS. 6A, 6B, 6C and 6D which represents four different linear positions of the coupler or slider. Their phase shift is proportional to the linear position of the coupler or slider.
- Referring back to FIG. 4 comparator to A3 then converts these waveforms to a square wave at
output 36 which drives the R input of the RS flipflop. This produces a pulse width modulator (PWM) output where the width of the pulse is exactly proportional to the amount of movement of the slider. Filter A4 provides an alternative analog output. - FIG. 5 illustrates the digital mixer and
waveform generator 16 and how it is related to the transmitter and receivecoils - An actual practical example of the position sensor of the present invention for measuring the displacement of a voice coil actuator is illustrated in FIGS. 7 and 8, where FIG. 7 is a voice coil actuator61 incorporating the position sensor and FIG. 8 shows the position sensor with its transmit
section 13, slider orcoupler section 12 andreceiver section 14 incorporated in the actuator. The transmitter and receiver are, of course, affixed to the frame 62 of the voice coil actuator with coupler orslider 12 as best illustrated in FIG. 7 being connected only tocoil holder 63, which moves in the direction as indicated by thearrow 64. It would be coupled to an actuated device such as the valve lifter of a diesel engine or some control device to control vehicle height.Movable coil holder 63 of actuator 61 includes a tubular coil 66 wrapped around it which interacts with the cylindrical ferromagnetic permanent magnet 67 through the air gap 68 in a manner well known in the art. The fixed outer frame 62 of the voice coil actuator is composed of soft iron for a flux return and is, of course, cylindrical in shape. The voice coil actuator may be used in conjunction with built in feedback control. - Referring now to FIGS.9 in their various forms, as was discussed the diamond shape of the symmetrical pattern on the
slider section 12 illustrated in FIG. 9A results in the linear pattern of FIG. 9B. If a second order characteristic is desired at either one end or the other end of movement of theslider 12, as illustrated in either FIGS. 9D and 9F, then the patterns of FIGS. 9C, and 9E, respectively, may be provided where in FIG. 9C the rate of change toward the maximum of the pattern is greater and in 9E the rate of change at the beginning of the pattern is greater. - Thus a linear position sensor has been provided.
Claims (6)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/764,840 US6448759B2 (en) | 1999-09-07 | 2001-01-17 | Non-contact linear position sensor for motion control applications with inductive attenuating coupler |
DE60206201T DE60206201T2 (en) | 2001-01-17 | 2002-01-11 | Linear position sensor without contact |
EP02250199A EP1225426B1 (en) | 2001-01-17 | 2002-01-11 | A non-contact linear position sensor |
JP2002045442A JP2002340611A (en) | 2001-01-17 | 2002-01-17 | Non-contact linear position sensor for motion control application |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/390,885 US6304076B1 (en) | 1999-09-07 | 1999-09-07 | Angular position sensor with inductive attenuating coupler |
US09/764,840 US6448759B2 (en) | 1999-09-07 | 2001-01-17 | Non-contact linear position sensor for motion control applications with inductive attenuating coupler |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/390,885 Continuation-In-Part US6304076B1 (en) | 1999-09-07 | 1999-09-07 | Angular position sensor with inductive attenuating coupler |
Publications (2)
Publication Number | Publication Date |
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US20010005133A1 true US20010005133A1 (en) | 2001-06-28 |
US6448759B2 US6448759B2 (en) | 2002-09-10 |
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US09/764,840 Expired - Lifetime US6448759B2 (en) | 1999-09-07 | 2001-01-17 | Non-contact linear position sensor for motion control applications with inductive attenuating coupler |
Country Status (4)
Country | Link |
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US (1) | US6448759B2 (en) |
EP (1) | EP1225426B1 (en) |
JP (1) | JP2002340611A (en) |
DE (1) | DE60206201T2 (en) |
Cited By (9)
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WO2006106422A2 (en) * | 2005-04-08 | 2006-10-12 | Ksr International Co. | Signal conditioning system for inductive position sensor |
US20070001666A1 (en) * | 2005-06-27 | 2007-01-04 | Lee Joong K | Linear and rotational inductive position sensor |
EP2221588A1 (en) * | 2007-11-20 | 2010-08-25 | Sumida Corporation | Rotation angle detecting sensor |
KR101200836B1 (en) * | 2004-04-09 | 2012-11-13 | 케이에스알 테크놀로지즈 컴퍼니 | Inductive position sensor |
US20140035564A1 (en) * | 2012-08-01 | 2014-02-06 | Silicon Works Co., Ltd. | Displacement sensor, apparatus for detecting displacement, and method thereof |
KR101415032B1 (en) | 2012-08-01 | 2014-08-06 | 주식회사 실리콘웍스 | Apparatus for detecting displacement and method thereof |
EP3514500A1 (en) * | 2018-01-22 | 2019-07-24 | Melexis Technologies SA | Flux coupling srensor and target |
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US6985018B2 (en) * | 2004-03-29 | 2006-01-10 | Bei Sensors & Systems Company, Inc. | Programmable, multi-turn, pulse width modulation circuit for a non-contact angular position sensor |
CN100445694C (en) * | 2004-04-09 | 2008-12-24 | Ksr科技公司 | Inductive position sensor |
US7538544B2 (en) * | 2004-04-09 | 2009-05-26 | Ksr Technologies Co. | Inductive position sensor |
US7221154B2 (en) * | 2005-04-07 | 2007-05-22 | Ksr International Co. | Inductive position sensor with common mode corrective winding and simplified signal conditioning |
US20070132449A1 (en) * | 2005-12-08 | 2007-06-14 | Madni Asad M | Multi-turn non-contact angular position sensor |
DE102007015524A1 (en) * | 2007-03-30 | 2008-10-09 | Cherry Gmbh | Method for producing an inductive damping element and inductive eddy current actuating element |
US7906960B2 (en) * | 2007-09-21 | 2011-03-15 | Ksr Technologies Co. | Inductive position sensor |
US7911354B2 (en) * | 2007-12-12 | 2011-03-22 | Ksr Technologies Co. | Inductive position sensor |
DE102007061967A1 (en) * | 2007-12-21 | 2009-06-25 | Pepperl + Fuchs Gmbh | An incremental pathfinder and method for determining a displacement of a first object relative to a second object |
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IT1401514B1 (en) * | 2010-08-03 | 2013-07-26 | Cifa S P A Unico Socio | PUMPING GROUP FOR A CONCRETE DISTRIBUTION MACHINE. |
DE102012010014B3 (en) * | 2012-05-22 | 2013-09-26 | Sew-Eurodrive Gmbh & Co. Kg | Method for determining the position of a mobile unit and installation for carrying out a method |
EP3262380B1 (en) | 2015-02-27 | 2019-04-10 | Azoteq (Pty) Limited | Inductance sensing |
CN111094901A (en) | 2017-07-13 | 2020-05-01 | 阿佐特克(私人)有限公司 | Inductive sensing user interface device |
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-
2001
- 2001-01-17 US US09/764,840 patent/US6448759B2/en not_active Expired - Lifetime
-
2002
- 2002-01-11 DE DE60206201T patent/DE60206201T2/en not_active Expired - Fee Related
- 2002-01-11 EP EP02250199A patent/EP1225426B1/en not_active Expired - Lifetime
- 2002-01-17 JP JP2002045442A patent/JP2002340611A/en active Pending
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WO2019141861A1 (en) * | 2018-01-22 | 2019-07-25 | Melexis Technologies Sa | Sensor package |
US11162817B2 (en) | 2018-01-22 | 2021-11-02 | Melexis Technologies Sa | Flux coupling sensor and target |
US11733318B2 (en) | 2018-01-22 | 2023-08-22 | Melexis Technologies Sa | Sensor package |
US20210325483A1 (en) * | 2020-04-15 | 2021-10-21 | Te Connectivity Belgium Bvba | Sensor Device and Sensor Assembly For Measuring The Rotational Position of an Element |
Also Published As
Publication number | Publication date |
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DE60206201T2 (en) | 2006-06-22 |
EP1225426A2 (en) | 2002-07-24 |
DE60206201D1 (en) | 2005-10-27 |
EP1225426B1 (en) | 2005-09-21 |
EP1225426A3 (en) | 2003-09-03 |
JP2002340611A (en) | 2002-11-27 |
US6448759B2 (en) | 2002-09-10 |
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