CN101384883A - Magnetic angular position sensor for a course up to 360 DEG - Google Patents
Magnetic angular position sensor for a course up to 360 DEG Download PDFInfo
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- CN101384883A CN101384883A CN200680051074.1A CN200680051074A CN101384883A CN 101384883 A CN101384883 A CN 101384883A CN 200680051074 A CN200680051074 A CN 200680051074A CN 101384883 A CN101384883 A CN 101384883A
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- magnetic
- angular position
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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
- G01D5/142—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 using Hall-effect devices
- G01D5/145—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 using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
-
- 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
- G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2451—Incremental encoders
Abstract
The invention relates to an angular position sensor comprising a moving element consisting of at least one essentially cylindrical permanent magnet (1) turning about it axis, at least two magnetosensitive elements (2, 3) and at least one processing circuit (4) furnishing a signal dependent on the absolute position of the moving element, characterized in that the magnetosensitive elements (2, 3) are located essentially at the same point and in that they measure the tangential component of the magnetic field and the radial and/or axial component of the magnetic field for furnishing 2 sinusoidal signals that are essentially 90 DEG out of phase.
Description
The present invention relates to the magnetic rotational position sensor field that angle can reach 360 °, more particularly, relate to the position transducer that is used for position, measuring vehicle steering column angle, but this application is not unique.
Come the sensor of detection angle to have many advantages according to magnetic field:
There is not Mechanical Contact with moving component, thus not wearing and tearing,
To dirty insensitive,
Low cost of manufacture,
Long service life.
Known in the prior art and had the patent EP1083406 that describes rotation sensor, this sensor has toroidal magnet and two magneto sensors, measurement is by the radial component of magnet institute magnetisation field and generate two square wave sinusoidal signals, and these signals are being used to detecting location on 360 ° of scopes after the decoding.
The shortcoming of this scheme is to have two probes, so just may be owing to a probe causes measuring error with respect to the malposition of another probe.In addition, exist the integrated circuit of 90 ° of two spatial offset that the final cost of this sensor is increased, because the P.e.c. surf zone may be very big, the contact number can increase.
Know also that in the prior art existence can measure the probe of two components in magnetic field (Hall effect probe, such as Melexis MLX90316 or the magnetoresistance probe made on a position.)
Also know in the prior art to exist patent US06316935, description can rotate 360 ° position transducer (see figure 1), determine basic position, angle along the magnetized disk magnet of diametric(al) with the magnetoresistance probe.In this patent, the magnetoresistance probe of the orientation-sensitive of this magnet institute magnetisation field is positioned at below this magnet, and also basic just on turning axle.The Bx in the magnetic field on this magnet turning axle of this probe measurement and By component (see figure 2).This structural limitations of magnet and probe the use of this sensor.This be because, adopting the rotation sensor measurement to have under the situation of position, angle of system's (such as steering column) of axis, this magnet and sonde configuration are impossible adopted, and its reason is that the size of steering column makes it can't give the location of the magnetoresistance element on its turning axle.
The present invention proposes solution to the problems described above, manage to use on a single point outside the turning axle of magnetized ring-shaped magnet or disk magnet and (say with physical term along diametric(al), if less than 5mm, just thinking to measure, the distance between the measuring point of magnetic-field component on a single point, carries out.) record simultaneously two magnetic-field components (radially with tangential, axial in other words with tangential) determine its position, angle, this angle although not corresponding with the angle, magnetic field (note: have only when carrying out on the axle of measuring at this same magnet, the direction in magnetic field just can " align " with the position, angle of magnet).So the solution that describes below is exactly to want can reduce the cost of sensor and improve measuring reliability, makes it adapt to different geometries, particularly equipment with advantageous manner simultaneously and have the situation of axis.
If we consider along any point in magnetized annular of diametric(al) or the disk magnet surrounding space, will find that radial component and axial component by this magnet institute magnetisation field are the sinusoidal curves of two homophases, tangential component then is to differ 90 ° sinusoidal curve (see figure 3) with the phase angle of two other components in this magnetic field.So, can utilize the phase angle in this magnetic field to differ 90 ° a pair of component (tangential and radial component or tangentially and axial component) and adopt the decode angle of this magnet of following formula:
Wherein: α is a rotation angle; V
1Be magnetic field radially or axial component; V
1maxBe V
1Amplitude; V
2It is the tangential component in magnetic field; V
2maxBe V
2Amplitude.
According to these two amplitudes usually different components decoded in the position, angle of magnet, need carry out standardization to two used components, can carry out arctangent computation like this and therefrom derive angle.These decodings and standard functions or undertaken by element (4) are independently perhaps undertaken by the probe (such as MLX90136) that is directly combined by the standardization with the decoding of the measurement of two magnetic-field components, this angle and these two magnetic-field components.
Advantageous method is to adopt the integrated circuit of single SMD (surface mount device) type economically, and its P.e.c. surf zone is more much smaller than the situation of two probes of the 90 ° of arrangements of being separated by around the employing magnet.
In a preferred embodiment, magnetoresistance element comprises the (CPP) magnetoresistive sensor that at least one pair of its axes of sensitivity is parallel to each other, this a pair of sensor is realized magnetic coupling by the ferromagnetic yoke perpendicular to above-mentioned axes of sensitivity, above-mentioned yoke is installed on the plane vertical with this turning axle, perhaps is installed in and passes on the plane of plane parallel of turning axle.As exemplary method, that magneto sensor can comprise is that Melexis produces, have the probe MLX90136 that makes up electromagnetic flux field concentrator, and this probe comprises 4 coplane sensors (so axes of sensitivity is parallel).These 4 Hall elements are positioned under the ferromagnetic disk border that constitutes yoke.They spatially are separated by 90 °.Near magnetic field bending (having high relative permeability) ferromagnetic disk.The magnetic line of force is perpendicular to the surface of electromagnetic flux field concentrator, and they pass Hall element, so can measure two magnetic-field components in this probe plane.And because near magnetic line of force quilt ferromagnetic disk is concentrated, the magnetic field of being measured by these Hall elements is exaggerated.Each axle (X-axis and Y-axis, perhaps X-axis and Z axle) on Hall element be connected to the signal processing circuit that (be used for offset this magnetic field axial component) of these two Hall elements voltage difference can be provided, this voltage difference is then amplified by A/D converter and is sampled.This digital signal processing circuit each component be multiply by a programmable-gain (just can obtain the sinusoidal curve that amplitude equates substantially like this) and before carrying out division and arctangent computation skew, orthogonality, the fluctuation of temperature correlation (in) at the probe parameter carry out various compensation.For instance, in the output of integrated circuit, can obtain this angle with the voltage form that is proportional to angle.
The present invention adopts by having the ring-shaped magnet that the anisotropic plasticity ferromagnet of diametric(al) is made with advantageous forms, so just can obtain good performance by enough minimum possible costs.And use has anisotropic magnet and helps magnetic history.This be because the performance (linearity of output signal) of sensor directly depend on can obtain good in diametric magnetization.Also can use isotropic magnet, but be used for making magnet to obtain along but more complicated of diametric " well " magnetized magnetic history.This be because, though be easy to obtain by the simple coils of energising along the necessary magnetizing field of diametric(al) magnetization ring-shaped magnet, but make magnetic line of force bending owing to the magnetic permeability between the air and the material that will be magnetized is different, its degree of crook is relevant with the border refractive index between the two media, and its relation is as follows:
This bending is converted into non-diametric material magnetization, so just be converted into the distortion of two components of surveying shown in Figure 10.As same shown in Figure 10, these two signals are not that two phase angles differ 90 ° sinusoidal curve, and in the process of decoding phase angle, this can change into appreciable non-linear, and Figure 10 has also shown the signal according to two component decoding gained in this magnetic field.
Under the situation of isotropic material, for correct with the compensating magnet inner magnet line of force, cause the magnetized this bending of " bad " diametric(al), the profile of magnet does not just adopt circle, but selects the basic oval shape (seeing Figure 11) that is for use.
When using probe MLX90316, also can be this probe programming according to the mode of special indemnities nonlinearity erron.Compensation is to realize by the different gains of whole sensor scope is programmed.Under this programming situation, Figure 12 has shown following content:
Signal by nonlinear transfer function decoding gained;
Decoded signal is non-linear.
At isotropic magnet or have under the situation of magnet of radial anisotropic, also can adopt in the peripheral diametrical magnetization method of obeying sinusoidal rule of this magnet and come progressive magnetization magnet.This mode of magnetization can be avoided because the magnetic line of force reflects the error of caused direction of magnetization, and this error can occur really under the magnetized situation along diametric(al).
Under the applicable cases that needs the output signal redundancy, it is contemplated that naturally by using with respect to turning axle first measuring point of making peace has second measuring point of angular deflection to make system become double.Preferably can have two similar shells, each shell is conciliate the measurement of two signals with code character and is incorporated into together, a signal is tangential, another signal is from the combination of radial and axial component, these two signals have all been done special gain-adjusted, so that two independently angle position signals are provided.
In the applicable cases that the steering column position that the bearing circle with several circles of rotation is linked is measured, as can be seen, must measure stroke greater than 360 °.At this moment, can adopt according to sensor of the present invention and by the rotation that it and deceleration of motion device is linked with a few circle scopes and reduce to the rotation that is less than or equal to 1 circle in the sensor.
The present invention may be better understood with reference to following accompanying drawing:
Fig. 1 represents the magnetic line of force that produced along the magnetized disk magnet of diametric(al),
Fig. 2 represents to be positioned at 3 magnetic induction components on the point (O point shown in Figure 1) on the magnet turning axle,
Fig. 3 represents to be positioned at 3 magnetic induction components on the outer point of magnet turning axle,
Fig. 4 represents general view of the present invention,
Fig. 5 represents to adopt radially and the view of the rotation sensor of tangential inductive component,
Fig. 6 represents to be positioned at 3 magnetic induction components (measuring point is positioned at the midplane of magnet) on any point of structure space shown in Figure 5,
Fig. 7 represents to adopt the view of the rotation sensor of axial and tangential inductive component,
Fig. 8 represents relative permeability (μ r) is equaled the magnetic line of force of the magnet inside after the magnetization of 1 material,
Fig. 9 represents relative permeability (μ r) is equaled the magnetic line of force of the magnet inside after the magnetization of 1.2 material,
Figure 10 be illustrated in along the signal that records on " diametric(al) " the magnetized isotropy annulus magnet radially and tangential magnetic induction component and nonlinear characteristic,
Figure 11 is illustrated in along the radial and axial magnetic induction component and the nonlinear characteristic of the signal that records on " diametric(al) " magnetized isotropic, magnet with basic elliptical profile,
Figure 12 is illustrated in the signal that records on the isotropic magnet, adopt the nonlinear transfer function decoding,
Figure 13 represents to have the magnet of progressive diametrical magnetization,
Figure 14 represents 3 magnetic induction components on the arbitrfary point in the magnet surrounding space,
Figure 15 represent according to of the present invention, have the sensor combinations of speed reduction unit for use in the multi-turn application scenario,
Figure 16 represents to be positioned at 4 Hall elements at electromagnetic flux field concentrator edge,
Figure 17 represents to exist the magnetic line of force under the electromagnetic flux field concentrator situation,
Figure 18 represents to adopt the signal Processing block diagram of the probe of 4 Hall elements and electromagnetic flux field concentrator,
Figure 19 and Figure 20 represent according to second embodiment of the present invention, that magnet is magnetic shoe,
Figure 21 represents that according to a second embodiment of the present invention the probe that wherein comprises magneto sensor is positioned at the inside of hollow cylinder magnet,
Figure 22, Figure 23 and Figure 26 represent that according to a second embodiment of the present invention wherein probe is connected with the radome of shielding external magnetic field,
Figure 24 and Figure 25 represent that according to a second embodiment of the present invention wherein this sensor is connected with bearing.
Fig. 1 represents to adopt the typical magnetic line of force that is obtained along the magnetized disk magnet of diametric(al).The magnetic line of force be drawn in by magnetic blow out centre, with the plane of magnet magnetization direction conllinear on.In Fig. 2 and Fig. 3, to being positioned at the measuring point on the magnet turning axle and being positioned at, drawn radially (Bx), tangential (By) and axial (Baxial) magnetic induction component than the measuring point on the bigger radius of magnet outer shaft radius.Fig. 2 represents, certain point on axle equates that as the magnetic induction component X and the Y amplitude of the function of magnet swing axial component is 0, with the location independent above magnet.As can be seen from Figure 3,3 magnetic induction components are not 0, radial and axial component homophase, and tangential component and other two components differ 90 ° on phase angle.
Fig. 4 represents according to sensor of the present invention, comprises the annular permanent magnnet of diametrical magnetization (1) basically; This magnet produces magnetic field in any point, space, this magnetic field have by two magneto sensors measure radially or axial component (3) and tangential component (2), the signal of measuring sensor is via these two components execution decodings and standardized treatment element (4) are handled, so that export an electric signal that is proportional to this position, magnet angle.
Fig. 5 represents the sensor construction as the steering column sensor, utilize magnetic field that magnet (1) produces radially and tangential component.That this structure adopts is magnetized along diametric(al), be directly mounted to the ring-shaped magnet on steering column or the driving shaft (5).Popping one's head in, the plane is oriented to according to favourable mode and the symmetrical plane coplane of this magnet, so that can limit the influence of the axial component in this magnetic field under the situation that probe (6) positioning error occurs.This is because for this specific structure, the axial component in magnetic field is 0, so even probe is not properly oriented, the projection of the axial component that this probe records on tangential component also can be 0.In this specific structure, the probe of employing differs two signals of 90 ° with the standardization of integrated, two components of two magnetic-field component measured values and based on phase angle angle decoding is grouped together.According to the variant form of a hope, this magnet is directly bonded to steering column.
Fig. 7 represents the sensor construction as the steering column sensor, utilizes the axial and tangential component of the magnetic induction of magnet (1) generation.To this structure, do not have the probe positions that can cause radial component obviously to be offset, and under the condition of poor of probe (4) location, this counteracting can produce certain tangential component, thereby causes the distortion of output signal.For this structure, the position of probe will be selected by favourable mode, so that radial component is reduced to minimum, will keep other two components simultaneously and will have optimum amplitude.In this specific structure, the probe of employing differs two signals of 90 ° with the standardization of integrated, two components of two magnetic-field component measured values and based on phase angle angle decoding is grouped together.
Fig. 8 is illustrated in order to obtain, to have relative permeability and equals 1 (μ after magnetizing along diametric magnetization
r=1, just as air) the inside and outside magnetic line of force of ring-shaped magnet.The magnetic line of force passes magnet and any distortion does not take place, and so just can access correct in diametric magnetization.
Fig. 9 represents to have the inside and outside magnetic line of force of ring-shaped magnet after magnetization that relative permeability equals 1.2.Distortion has taken place in the magnetic line of force when passing magnet, this distortion is because the relative permeability (μ of air
r=1) and the relative permeability of magnet (be μ under this situation
r=1.2) difference causes.So this deviation of the magnetic line of force just is converted into along diametric bad magnetization.In order to address this problem, certainly adopt to have the anisotropic magnet of wishing direction of magnetization.Under the isotropic magnet situation, will be difficult to obtain to cause result shown in Figure 10 like this along diametric good magnetization.In order to correct and compensate this magnetization error, can adopt the magnet that is essentially elliptical profile.The inductive component of measuring on this magnet as shown in figure 11.In difference owing to magnetic line of force refractive index, and because the nonlinear characteristic aspect that variation caused of measurement clearance, significantly improvement as can be seen.
Under the situation that adopts the isotropy ring-shaped magnet, can produce bad diametric(al) magnetization owing to the magnetic line of force refraction of magnet surface in the magnetic history, at this moment, if adopt probe able to programme that nonlinear transfer function is programmed, just can partly compensate non-linear (the seeing Figure 12) of this signal.
Adopting isotropic magnet or having under the situation of magnet of radial anisotropic, Figure 13 is illustrated in the ring-shaped magnet that the remanent magnetization in the 1 circle scope has sinusoidal variations.This structure causes signal shown in Figure 14.
Figure 15 represents according to sensor of the present invention, be incorporated into the ring-shaped magnet that links to each other with speed reduction unit output so that measurement be positioned at this speed reduction unit input end element greater than 360 ° stroke.For instance, this can be used to steering column need be in a few circle scopes the situation of detection direction Pan Jiao position.The sensor that the example shown of Figure 15 links to each other with planetary reducer but, as long as formed combination can be applicable to this applicable cases, can use any other deceleration system.
Figure 16 represents electromagnetic flux field concentrator (19) and is positioned at element (19) edge below and 4 Hall elements (15,16,17 and 18) of 90 ° at interval.Each Hall element (15,16,17 and 18) have one along Z axle trend, perpendicular to the detection axis of the XOY plane of electromagnetic flux field concentrator (19). Element 15 and 16 magnetic induction of measuring, element 17 and 18 magnetic induction of measuring along Y-axis along X-axis.The yoke (19) of 4 elements (15,16,17 and 18) and electromagnetic flux field concentrator (19) is installed in this assembly of encapsulation so that form in the shell of single parts.
Magnetic line of force when Figure 17 represents to have electromagnetic flux field concentrator (19) on the cross section vertical, edge with one of X-axis and Y-axis.Hall element (17) and (18) are passed in magnetic line of force bending, and become perpendicular to this concentrator surface.
Figure 18 represents the signal Processing block diagram.Signal V
xAnd V
y(provide signal V from Hall element 15
Z1), 16 (provide signal V
Z2) and 17 (provide signal V
Z3), 18 (provide signal V
Z4) obtain.Their difference is amplified by gain module (21) (comprising the gain of electron gain and ferromagnetic concentrator 19), arrives digital signal processing module (23) through A/D converter (22): this module is carried out the correction to institute's vibration measuring width of cloth, and output signal (V is provided
Out).
In Figure 19 and Figure 20, magnet (1) is along the magnetized cylinder magnetic shoe of diametric(al).Thisly infinite a plurality of direction with respect to magnetic shoe (1) can be described along diametric orientation.Figure 19 and Figure 20 are two examples of the direction taked of this magnetization.In Figure 19, for the center of magnet (1), magnetization is radially, and is tangential in Figure 20.So these examples do not constitute any substantial restriction.
Figure 21 represents second embodiment, and wherein probe (6) is positioned at the cylinder of formation annulus or the inside of hollow magnet (1).In fact, if it is like this to hold the system dimension needs of sensor, allow the such placement of probe (6) may be favourable.
Figure 22 represents sensor described in the invention, that link to each other with the radome (81) of shielding external magnetic field with Figure 23.In fact, if the environment that this sensor will be used to be polluted guarantees that insensitive to external signal is favourable.In Figure 22, magnet (1) is installed on the ferromagnetic yoke (71), and yoke itself is installed on the axle (5).Probe (6) is positioned at the place ahead of magnet (1), and its direction can be measured the tangential and radial component in this magnetic field.Its conductively-closed cover (81) surrounds, and radome then is generally used for this materials with function according to the employing of indefiniteness by way of example and makes, and for example has the alloy of high magnetic permeability.Because probe (6) is insensitive to axial magnetic field, so radome (81) preferably is positioned at probe (6) on every side along the magnet plane.In Figure 23, can see the identical function of shielding that links to each other with identical sensor, but the mounting means of probe (6) can be measured the tangential and axial component in this magnetic field.In this embodiment, because probe (6) is to radially magnetic field is insensitive, so best edge of radome (81) and the tangent plane of magnet (1) are positioned at around the probe.Place in this manner, radome (81) just can guarantee in measuring process insensitive to the external magnetic field.In Figure 22 and Figure 23, radome (81) has the undersized sheet form that folds.
Figure 22 and radome (81) shown in Figure 23 are a kind of useful solutions, can make the size minimum, but and non-limiting like this.All shielding means that those skilled in the art understood can both be grouped together with this position transducer undoubtedly.For example, in Figure 26, radome (81) is represented with a ring, surrounds the assembly that is made of magnet (1)+probe (6) fully.
Because sensor according to the present invention is particularly suitable for comprising the application scenario of axis according to the indefiniteness mode, so can imagine the position that this sensor is placed on adjacent bearing (such as ball bearing).Figure 24 and Figure 25 represent two embodiment of the sensor that links to each other with ball bearing described in the invention.The probe of Figure 24 (6) is to tangential and axial magnetic field sensitivity, and the probe among Figure 25 (6) is to tangential and radial magnetic field sensitivity.In both cases, ball bearing (91) is positioned near this sensor, so that form compact assembly.In the ideal case, the size of magnet (1) and sensor, and the position of sensitive element all should and comprise this sensor and the overall dimension of the assembly of bearing (91) is selected according to bearing (91) size.
Claims (24)
1, a kind of angular position pick up that comprises moving component, this moving component comprises that at least one is permanent magnet (1), at least two magneto sensors (2 columniform, that center on its rotation substantially, 3) and at least one treatment circuit (4), this treatment circuit provides the signal relevant with the absolute position of this moving component, it is characterized in that
Magneto sensor (2,3) is positioned at same point substantially, and measure the tangential component in magnetic field and magnetic field radially and/or axial component, with the sinusoidal signal that provides two phase angles to differ 90 ° substantially.
2, according to the magnetic position sensor of claim 1, it is characterized in that, comprise at least one flux concentrating element and two pairs of magneto sensors, the axes of sensitivity of these magneto sensors is parallel to each other, the position of above-mentioned all elements is near the periphery perpendicular to the yoke of above-mentioned parallel axes of sensitivity, two elements in above-mentioned all elements measure this magnetic field radially and/or axial component, other two elements are measured the tangential component in this magnetic field.
According to the magnetic position sensor of claim 2, it is characterized in that 3, differ two signals of 90 ° for phase angle is provided, the signal that these magneto sensors provided is made up by per two one group.
4, according to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that, described signal processing circuit (4) adopt phase angle differ 90 °, carry out arctangent computation from two electric signal of at least two magneto sensors.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 5, described signal processing circuit (4) allow to be regulated the gain of two signals of this angle that is used to decode.
According to the magnetic position sensor of claim 1, it is characterized in that 6, the calculating of the measurement in magnetic field, the adjusting of gain and arc tangent decoding is integrated among the same shell.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 7, permanent magnet (1) is a hollow cylinder.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 8, described magneto sensor is located substantially on the midplane of this magnet.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 9, permanent magnet (1) bonds to the turning axle that will measure its position.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 10, permanent magnet (1) is bonded to ferromagnetic yoke.
According to the magnetic position sensor of aforementioned arbitrary claim, it is characterized in that 11, this permanent magnet magnetizes along diametric(al) basically.
12, according to any magnetic position sensor in the aforementioned claim 1 to 10, it is characterized in that permanent magnet (1) is basically along the magnetized magnetic shoe of diametric(al).
According to any angular position pick up in the aforementioned claim 1 to 10, it is characterized in that 13, this magnet has progressive sine magnetization in a circle scope.
According to preceding arbitrary magnetic position sensor of stating claim, it is characterized in that 14, signal processing circuit (4) allows the non-linear programming of transport function.
15, according to the angular position pick up of aforementioned arbitrary claim, it is characterized in that, comprise magnetic induction that measurement is produced by this magnet radially with the probe of tangential component.
16, according to the angular position pick up of aforementioned arbitrary claim, it is characterized in that, comprise the probe of measurement by the axial and tangential component of the magnetic induction of this magnet generation.
17, according to the angular position pick up of aforementioned arbitrary claim, it is characterized in that, the anisotropic material manufacturing of this magnet, and have the outer shape that is essentially circular.
18, according to the angular position pick up of aforementioned arbitrary claim, it is characterized in that, the isotropic material manufacturing of this magnet, and have the outer shape that is essentially oval.
According to the angular position pick up of aforementioned arbitrary claim, it is characterized in that 19, its stroke is less than or equal to 360 °.
20, according to the angular position pick up of aforementioned arbitrary claim, be associated, it is characterized in that this magnet is fixed to the output of this speed reduction unit with the deceleration of motion device.
21, according to the angular position pick up of one of aforementioned claim, it is characterized in that, comprise the device that magnetic field is shielded.
According to the angular position pick up of aforementioned arbitrary claim, it is characterized in that 22, this shield assembly has the shape of the thin plate that folds near described magneto sensor.
According to the angular position pick up of claim 21, it is characterized in that 23, this shield assembly has the shape of cylinder ring.
24, according to the angular position pick up of one of aforementioned claim, it is characterized in that, link to each other with the mechanical bearing parts.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0511567A FR2893409B1 (en) | 2005-11-15 | 2005-11-15 | MAGNETIC ANGULAR POSITION SENSOR FOR A RACE OF UP TO 360 ° |
| FR0511567 | 2005-11-15 | ||
| FR0651174 | 2006-04-03 | ||
| FR0651174A FR2893410B1 (en) | 2005-11-15 | 2006-04-03 | MAGNETIC ANGULAR POSITION SENSOR FOR RACE UP TO 360 |
| PCT/FR2006/002526 WO2007057563A1 (en) | 2005-11-15 | 2006-11-15 | Magnetic angular position sensor for a course up to 360° |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101384883A true CN101384883A (en) | 2009-03-11 |
| CN101384883B CN101384883B (en) | 2013-03-27 |
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ID=36087690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680051074.1A Active CN101384883B (en) | 2005-11-15 | 2006-11-15 | Magnetic angular position sensor for a course up to 360 DEG |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101384883B (en) |
| FR (1) | FR2893409B1 (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564468A (en) * | 2010-12-15 | 2012-07-11 | Nxp股份有限公司 | Magnetic field sensor |
| CN102725612A (en) * | 2009-11-06 | 2012-10-10 | 移动磁体技术公司 | Bidirectional magnetic position sensor having field rotation |
| CN102893131A (en) * | 2010-09-29 | 2013-01-23 | 移动磁体技术公司 | Improved position sensor |
| WO2013120374A1 (en) * | 2012-02-17 | 2013-08-22 | 湖南三一智能控制设备有限公司 | Multiturn rotary encoder |
| US8890514B2 (en) | 2009-07-07 | 2014-11-18 | Moving Magnet Technologies (Mmt) | Magnetic multi-periodic absolute position sensor |
| CN104583728A (en) * | 2012-08-22 | 2015-04-29 | 罗伯特·博世有限公司 | Sensor arrangement for detecting angles of rotation on a rotated component |
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| CN101384883B (en) | 2013-03-27 |
| FR2893409A1 (en) | 2007-05-18 |
| FR2893409B1 (en) | 2008-05-02 |
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