DE4422868A1 - Magnet rotation angle sensor - Google Patents

Magnet rotation angle sensor

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Publication number
DE4422868A1
DE4422868A1 DE19944422868 DE4422868A DE4422868A1 DE 4422868 A1 DE4422868 A1 DE 4422868A1 DE 19944422868 DE19944422868 DE 19944422868 DE 4422868 A DE4422868 A DE 4422868A DE 4422868 A1 DE4422868 A1 DE 4422868A1
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Germany
Prior art keywords
signal
characterized
device according
function
device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19944422868
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German (de)
Other versions
DE4422868C2 (en
Inventor
Soenke Dr Rer Nat Mehrgardt
Ulrich Dr Ing Theus
Mario Dipl Ing Motz
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TDK-Micronas GmbH
Original Assignee
ITT Industries GmbH
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Priority to DE19944422868 priority Critical patent/DE4422868C2/en
Publication of DE4422868A1 publication Critical patent/DE4422868A1/en
Application granted granted Critical
Publication of DE4422868C2 publication Critical patent/DE4422868C2/en
Anticipated expiration legal-status Critical
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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00Measuring arrangements characterised by the use of electric or magnetic means
    • G01B7/30Measuring arrangements characterised by the use of electric or magnetic means for measuring angles or tapers; for testing the alignment of axes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D1/00Measuring arrangements giving results other than momentary value of variable, of general application
    • G01D1/16Measuring arrangements giving results other than momentary value of variable, of general application giving a value which is a function of two or more values, e.g. product, ratio
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/142Mechanical 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
    • G01D5/145Mechanical 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

Abstract

An adjustable unit (11) is provided, connected with the Hall sensors (1,2), and is controlled by adjusting values (P). In which at least one of the measurement signals (x,y) is multiplied with function valves (w) of a function (f). The function (f) is so selected, that for each angle of rotation(alpha) of a sector, an unambiguous adjusting value (P) is given. With which the output signals of the adjusting unit (11) are of equal size. A comparator (6) is provided, to which at least one output signal of the adjusting unit is supplied, for comparison with a reference signal. A control unit (8) alters the adjusting value (P), until the adjusting value (P) allocated to the angle of rotation (alpha) is found.

Description

The invention relates to a method and a device for determining a rotation angle of a rotatable magnet.

Such a method and device are used by Rich tion sensors such as navigation systems and compass and when determining the angle of rotating shafts like encoders etc. The angle of rotation can then be on the one hand be true when the magnet rotates continuously, on the other hand when the magnet is in a static position and a fixed angular position or a fixed one Angle of rotation.

The determination of the angle of rotation in such methods and devices takes place in the Practice in that with two magnetic field sensors two components of which rotating magnet generated magnetic field can be measured. The magnetic field sensors are usually concentric to the axis of rotation of the magnet, for example by 90 ° offset, arranged. The phase-shifted measuring si to each other, for example by 90 ° Signals of the magnetic field sensors are each transferred to an analog / digital converter and fed by this to a computing device. In the computing device due to the phase relationship between the two signals for each measured value Angle of rotation calculated. The amount of the measurement signal can also be in the computing device le can be calculated. The amount determination serves to check the function the device.

The disadvantage of such a method and such a device are Large number of necessary, successive process steps, the space requirement and the cost of the necessary circuit blocks. This is a monolithic Integration of this method and this arrangement counter.

The invention has for its object a method and an apparatus for Determine an angle of rotation of a rotatable magnet to create the rotation  angle is easier to determine and the space requirement of the device is less.

With regard to the method, the object is achieved in that a first and a second measurement signal dependent on the angle of rotation with a predetermined phase shift Exercise a controllable setting device in which at least one of the Measurement signals multiplied by function values w of a function f of setting values P. is, the function is selected so that it for each angle of rotation of an angular range ches a clear setting value P, at which the output signals of the setting device are the same size, and the set value P is changed until the Setting value P assigned to the angle of rotation is found.

Furthermore, the object is achieved by a device with a first and a second Solved magnetic field sensor, which are arranged so that a first and a second from Measurement signal dependent on the angle of rotation can be measured with a predetermined phase shift are, with a controllable by means of setting values P, with the magnetic field sensors bound setting device in which at least one of the measurement signals with function value w of a function f is multiplied, the function f being chosen so that it gives a unique setting value P for each angle of rotation of an angular range which the output signals of the setting device are the same size, with a comm parator, the at least one output signal of the setting device for comparison with a reference signal is supplied, and with a control device with which the The setting value P can be changed until the setting assigned to the angle of rotation value P is found.

Through the method and the device according to the invention, the Angle of rotation can be determined in a simple manner. It is about determining the angle of rotation no computing device and therefore no A / D converter required. The rotation angle mood can be based on an analog arrangement. Such an evaluation direction also has the advantage that it can be integrated very easily on a chip and no adjustment is required.

The angular range in which, due to the function, the rotation angle is a clear value P is assigned, can be selected to be different in size depending on the application  will. The function f can be limited by a simple approximation function Angular ranges are approximated. This can often be done in small angular ranges by a linear function. So z. B. when using a sinusoidal measurement signal, the lower angular range of the function f by a linear function be approximated. A prerequisite for carrying out the procedure is that the first and the second measurement signal are the same size, d. H. have the same peak amplitude. The measurement signals can be described with B · f (α).

Preferred embodiments of the invention are disclosed in the subclaims.

The magnetic field sensors advantageously have Hall elements. The Hall elements can be integrated very easily on a chip together with the evaluation device ren.

It is advantageous if the setting device can be controlled digitally. Then they can Setting values can be easily changed with the control device. It is also convenient if the adjusting device has a first resistor chain, the resistors of this type trained and connected in series that an output signal for a setting value It can be tapped which the function value w assigned to the setting value P is radio tion f corresponds. So the measurement signal can easily with the function multipli be decorated. If the function is to be a linear function, equal resistances are used used so that you get a linear resistance divider. This can also be used for a linear approximation of the function can be used in an angular range. Outside of this angular range can then be determined by means of a definite unique value P. Table or be corrected using a computer. If the angles are outside the Angular range are insignificant for the application, they do not need to be taken into account to become. If the measurement signals and thus the function f are not in the angular range are linear, the resistors of the resistor chain must be selected to be different sizes so that the function values assigned to the setting values are realized. The resistor chain can consist of individual resistors connected by means of switches consist. The switches can be controlled digitally.

According to an advantageous embodiment of the invention, the first measurement signal  a sine signal and the second measurement signal a cosine signal. These measurement signals are easily achieved by a magnet rotating around a fixed axis, whose north and south poles are arranged on a line perpendicular to the axis of rotation.

It is advantageous if each magnetic field sensor has an inversion element for inverting animals of the respective measurement signal is connected. When using sine and Cosine signals can then be converted by inverting the measurement signals accordingly each generate a sine and a cosine signal in the first quadrant. Can too a signal exchange element between the magnetic field sensors and the setting direction be provided. With this, the two measurement signals can be used together if necessary be exchanged. The swapping of the measurement signals or the inverted measurement signals also serves to achieve that the output signals of the signal exchange element Correspond measurement signals in a certain angular range, for. B. a sine and a cosine signal between 0 and 45 °.

According to an advantageous embodiment of the invention, the resistance chain designed so that the tapped output signal multipli with a tan function adorned measurement signal corresponds. The individual resistors in the resistor chain chosen so that when tapping between the resistors a multiplication is obtained with the tan function. This function is useful if the meas signals are a sine and a cosine signal, and only the sine signal is the resistance chain goes through. If the comparator for difference formation the output signal of Resistor chain and the other measurement signal are supplied, there is for all Drehwin kel from 0 to 90 ° a unique setting value P, at which the output signals, d. H. the Output signal of the resistance forces and the other measurement signal are the same size. This The setting value P is present when the comparator has signals of the same size, which is indicated by the output signal of the comparator. The outside of the 0 to 90 ° angular ranges are described by the above Get inversion and signal swap.

According to an advantageous development of the invention, one with at least one Measurement signal connected amount resistance chain is provided, which is designed such that a unique magnitude signal can be tapped for each setting value P of the angular range,  which is the measurement signal multiplied by the reciprocal of the function f at the point corresponds to the setting value P. Thus, the amount of the measurement si can be obtained in a simple manner Determine gnals, which makes it possible to check the functioning of the device is. It can also be checked whether the amplitude remains constant. To this An adjustment of the device is also possible.

Either the first resistance chain can be used for the magnitude resistance chain will. In this case, additional taps must be provided on which the ent speaking amount signal can be tapped. In this case, after the value P, the assigned to the angle of rotation has been determined, one assigned to this value P. Setting value for the amount function can be controlled at which the corresponding Amount signal is tapped. This arrangement has the advantage that it is very spacious is saving. The magnitude resistance chain can also be designed as a second resistance chain det be. In this case, the magnitude resistance chain can be parallel to the resistance be switched chain, and the resistors can be chosen and arranged so that at the point where the unique value P of the first resistor chain lies, the ent speaking setting value for the magnitude signal and is therefore directly in the same place can be read.

According to an advantageous embodiment of the invention, the magnitude signal correspond to the measurement signal multiplied by the reciprocal of the cosine function. This is useful if the measurement signals are a sine and a cosine signal, and that Sinus signal passes through the first resistance chain and the magnitude resistance chain. In in this case the amount of the measurement signals is obtained in a simple manner. Conveniently the magnitude signal and a reference signal for difference formation on a com given parator. It is then checked in a simple manner that the amount signal always has a certain height. The same comparator can be used the difference between the output signal of the resistor chain and the other Measurement signal is used. A switching element can then be connected upstream of the comparator with which the signals for determining the angle of rotation and the signals for Amount determination can be connected.

According to a further embodiment of the invention, the first Meßsi  gnal at one end and the second measurement signal at another end of the first counter Standchain be supplied, and the output signal of the resistor chain Comparator can be supplied with a reference signal. In this case, both the first and the second measurement signal multiplied by a function. It can e.g. B. that first and second measurement signals each with the inverse of the course of the measurement signal Function are multiplied, and the difference of the multiplied signals is formed becomes. This can be brought about by the fact that the first and the second measurement signal also opposite sign of the same resistor chain with suitably chosen Resistors are supplied and superimposed therein. The output signal is then compared to zero.

The first measurement signal is advantageously connected to one end and the second measurement signal fed to another end of the amount resistance chain. The amount function of Resistance chain is then chosen so that the amount can be determined by a suitable one Multiplication of both the first and the second measurement signal by the amount function takes place. The first and the second measurement signal are of the same sign given on the amount resistance chain in which they overlap.

It is also advantageous if with the control device based on the output signal of the comparator, the resistance chain or the magnitude resistance chain, the inversions elements and the signal exchange element are controlled, and the control device one Output for outputting a signal representing the angle of rotation.

A third and a fourth magnetic field sensor can advantageously be provided, wherein the third magnetic field sensor to the first and the fourth magnetic field sensor the second is connected in anti-parallel and the magnetic field sensors each by 90 ° are offset from each other so that together they are a square arrangement form, the anti-parallel magnetic field sensors by 180 ° to each other are staggered. This arrangement is particularly in the case of Hall elements on one integrated circuit (IC) cheap. There may be mechanical positioning inaccuracies of the Hall elements on the IC are compensated. It can be averaged Amounts of the measurement signals of the anti-parallel Hall elements are carried out. The Hall elements can be arranged in the corners of the IC.  

The measuring connections and the signal supply connections of the respective Hall elements can be switched orthogonally within a measurement cycle, and the measurement signal le of two different switching states for signal evaluation compared will. This greatly reduces offset errors of the Hall elements from the outset, so that greater measurement accuracy is achieved, see EP 0 548391 A1 (ITT-case C-DIT-1445). Furthermore, a compensation device for compensating the offset of the respective Hall element and the device is provided. This allows the offset the Hall elements are further reduced; in addition, the influence of the offset comm components of the entire device, d. H. of their individual components, which lead to the Contribute offset, eliminated.

The invention is explained in more detail below with reference to the drawing:

Show it:

Fig. 1 shows a schematic arrangement of the device according to the invention.

Fig. 2 shows a first embodiment of the device according to the invention,

Fig. 3 shows a second embodiment of the device according to the invention and

Fig. 1 shows a schematic arrangement of the apparatus according to the invention. Two magnetic field sensors, here a first Hall sensor 1 and a second Hall sensor 2 are arranged offset by 90 ° concentrically to an axis of rotation A. A magnet 20 , the north pole N and south pole S of which lie symmetrically on a straight line running perpendicular to the axis of rotation A, is arranged to be rotatable about the axis A. Due to the rotation of the magnet 20 , a signal x, which is a sinus signal and in the detector 2, a signal y, which corresponds to a cosine signal, is generated in the Hall sensor 1 . The measurement signals x, y are fed to an evaluation device 21 which contains an adjusting device 11 shown in FIGS. 2 and 3, a comparator 6 and a control device 8 . The evaluation device 21 outputs a signal D which contains information about the angle of rotation α of the magnet 20 . The angle of rotation α is known on the basis of the signal D.

Fig. 2 shows a first embodiment of the device according to the invention for determining the angle of rotation α of the rotary magnet 20. The magnet 20 is not shown in FIG. 2. The structure of the evaluation device 21 , to which the measurement signals x, y are supplied, is shown in more detail.

The measurement signals x, y are fed to the setting device 11 . They each pass through an inversion element 3 , 4 and a signal exchange element 5 . The signals x ', y' obtained by optional inversion and exchange of the signals x, y in the inversion elements 3 , 4 and the signal exchange element 5 are fed to the comparator 6 . The signal y 'is given directly to an input of the comparator 6 . The signal x 'passes through a first resistor chain 7 before it is passed to the other input of the comparator 6 . The control unit 8 effects the sequential scanning of the first resistor chain 7 . By scanning the resistor chain 7 , the input signal of the comparator 6 is influenced. The output signal of the comparator 6 is given to the control unit 8 . The inversion elements 3 , 4 and the signal exchange element 5 are also controlled by the control unit 8 . The control unit 8 outputs a signal D which corresponds to the angle of rotation of the rotating magnet. The output signal x 'of the signal exchange element 5 passes through an amount resistance chain 9 and is continued as an amount signal B.

The mode of operation of the exemplary embodiment according to the invention is explained below. The measurement signals x, y measured by the Hall sensors 1 , 2 pass through the inversion elements 3 , 4 and the signal exchange element 5 without there being an inversion or interchange of the signals x, y. The signal x ', which corresponds to the signal x here, is given to the first resistor chain 7 . The resistance chain 7 consists, for. B. from series-connected individual resistors, each of which can be connected to the comparator via a switch which can be controlled by the control unit 8 . By connecting a specific individual resistor to the comparator, it is determined via which or via how many of the individual resistors the voltage is tapped. The resistors are selected so that the resistance chain, depending on its setting values which can be controlled by the control unit 8, causes the incoming signal to be multiplied by the tangent function. The signal which reaches the one input of the comparator 6 via the first resistance chain 7 thus has the profile of x · tan α, where α corresponds to the angle of rotation. On the other input of the comparator 6 , the output signal y 'of the signal exchange element 5 is performed . If the input signals of the comparator 6 have the same size, the output signal of the comparator 6 changes its state. Since the output signal of the comparator 6 is supplied to the control unit 8 , the following condition can be checked with this:

x ′ · tan α - y ′ = 0 (1)

The relationship between the signals is given by equation 1):

x ′ = B · cos α
y ′ = BSin α (2)

given, where B corresponds to the amplitude of the signals.

A prerequisite for the application of formula 1) is that α is between 0 and 45 °. This requirement must be met because of the realization of the tangent function with the resistance chain 7 , on the other hand, the condition x 'y' 0 must be met for the comparison by the comparator 6 .

With the control unit 8 , the first resistor chain 7 is controlled by means of setting values until the output signal of the comparator 6 changes and thus the equation 1 is satisfied. The setting value determined by the control device 8 under this condition corresponds to a unique setting value P, which is assigned to the angle of rotation α. If the clear setting value P is found during this passage, the control device 8 outputs a signal D assigned to the angle of rotation α.

Has been in the case in which by the control device 8 is the spectrum of the setting controls and no change of the output signal of the comparator is strated regi 6, the control device 8, that the equation 1 is not been met. The control device 8 then controls the inversion elements 3 , 4 and / or the signal exchange element 5 in such a way that the measurement signals x and / or y are optionally inverted and / or interchanged with one another. Thereafter, the control device 8 controls the first resistor chain 7 again by means of the setting values and observes the output signal of the comparator 6 . If the output signal of the comparator 6 changes , a signal D associated with the angle of rotation α is determined and output on the basis of equation 1 and the information about the state of the inversion elements 3 , 4 and the signal exchange element 5 known to the control unit. From the input signal does not change the comparator 6, the inversion elements 3, 4 and / or signal exchange element 5 are driven again, and the driving operation of the first resistor string 7 was repeated by means of the setting values. The type and sequence of the inversion and the signal exchange with the inversion elements 3 , 4 and the signal exchange element 5 is such that the sine and cosine signals x, y are divided into 45 ° sections, which are inverted and interchanged until they meet the condition of the sine and cosine function between 0 and 45 °. Depending on the application, the control unit 8 can also be used to control the first resistor chain 7 with the setting values, in which it is not possible to continuously control all the setting values.

When the unique value P is found and the signal D determining the angle of rotation is output by the control device 8 , an absolute value resistance chain 9 is driven with the unique value P, so that it supplies an absolute value signal B.

The amount resistance chain 9 can, for. B. also consist of individual resistors connected in series, which can be connected to the amount output via switches 8 which can be controlled by the control unit. The resistors are chosen so that the signal x 'undergoes a multiplication by the inverse cosine function when it passes through the magnitude resistance chain 9 . The amount B of the measurement signals is thus given. This is because the following condition applies when using the signals x ′, y ′ shown in equation 2:

B = x1 / cos α. (3)

Modifications of the first exemplary embodiment are also possible. The magnitude resistance chain 9 can thus be contained in the first resistance chain 7 . The amount signal containing the amount B can also be sent to the comparator 6 and compared there with a fixed reference value.

In Fig. 3 shows a second embodiment of the invention is shown. Two Hall sensors 1 , 2 are arranged, the measurement signals of which are fed to an adjusting device which has elements comparable to the adjusting device 11 from FIG. 1. A symmetrical structure has been selected for the setting device, as this can eliminate symmetrical interference. In addition, otherwise necessary conversions of the signals can be avoided, since the high common-mode components of the Hall signal voltages do not influence the measurement process. For this purpose, the output signals from Hall sensors 1 and 2 are each split in half and thus given as signals x / 2 and y / 2 to the setting device.

The Hall sensors 1 , 2 are connected directly to the inversion elements 3 , 4 , which at the same time also represent a signal exchange element. The inversion elements 3 , 4 are connected in each branch of the setting device with the first resistor chain 7 , 7 '. On the resistance chains 7 , 7 'is thus given from one side the signal y / 2 or a correspondingly inverted signal and from the other side x / 2 or a correspondingly inverted signal. At the resistor chains 7 , 7 ', the signals a, a' are tapped and fed to the comparator 6 . The tapping of the signals a, a 'can be controlled by means of the control device 8 . For example, the taps of the signals b, b 'are also possible.

Furthermore, an amount resistance chain 9 , 9 'is provided in parallel with the resistance chains 7 , 7 ' in each branch of the adjusting device. On the magnitude resistance chains 9 , 9 'on one side the output signals of the inversion element 3 , and on the other side the output signals of the inversion element 4 are given.

The functioning of the exemplary embodiment shown is similar to that of the exemplary embodiment shown in FIG. 1. The signals x / 2 and y / 2 of the Hall sensors 1 , 2 are given to the resistor chains 7 , 7 '. The signals x / 2 and y / 2 are superimposed in the resistor chains 7 , 7 'with opposite signs. The superimposed output signal a is given to the comparator 6 . The resistance chains 7 , 7 'are constructed so that the taps represent a specific function, which is selected so that given the point at which the signal a, a' or b, b 'takes the value 0, there is a clear angle of rotation is. If the signal x is a sine signal and the signal y is a cosine signal, then the tangent function is contained in the function represented by the resistor 7 , 7 '. In this case, if a certain number of partial resistors of the resistor chain 7 , 7 'are tapped with the total resistance R, the partial resistance RT is given by:

R T = R / (1 + tan α) (4)

With the control device 8 , the tap a, a ', b, b' of the resistor chains 7 , 7 'is varied until the value zero is entered into the control device 8 via the comparator 6 . Each point at which such a signal value a, a ', b, b' is tapped is assigned a specific angle of rotation.

If the point is known at which the signal zero and thus the angle of rotation was determined, the corresponding parallel point of the respective magnitude resistance chains 9 , 9 'is driven. The function of the magnitude resistance chains 9 , 9 'is selected so that the signal tapped at this point reproduces the amount of the signal which is assigned to the angle of rotation determined by the resistance chains 7 , 7 '. This amount signal can either be given to a comparator, fed to the control device 8 or fed to another control unit. For the determination of the amount, the signals x / 2 and y / 2 are given the same sign on the amount resistance chains 9 , 9 '.

It is also possible, instead of the parallel to the resistance chains 7 , 7 'arranged amount resistance chains 9 , 9 ' to integrate the amount resistance chains in the resistance chains 7 , 7 '. Then the resistance chains 7 , 7 'must have taps that reflect the angle of rotation at different points and the amount of the measurement signals at other points. The assignment between the points at which the angle of rotation and the associated amount can be tapped must be known. If the angle of rotation has been determined, then the position assigned to the angle of rotation must be controlled on the resistor chain 7 , at which the associated amount signal can be tapped. The arrangement and taps of the resistance chains 7 , 7 'and the amount resistance chains 9 , 9 ' can, for. B. can be determined numerically.

Claims (17)

1. Device for determining an angle of rotation (α) of a rotatable magnet, with a first and a second on a semiconductor substrate monolithically integrated th Hall sensor ( 1 , 2 ), which are arranged so that a first and a second measurement signal dependent on the angle of rotation (x ,) y with a predetermined phase displacement bung measurable, are controllable with a means of setting values P, with the Hallsen sensors (1, 2) adjustment means (11) connected, in which at least one of the measurement signals (x, y) with function values w of a function f is multiplied, the function f being chosen so that there is a unique setting value P for each angle of rotation (α) of an angular range, in which the output signals of the setting device ( 11 ) are the same size, with a comparator ( 6 ), the at least an output signal of the setting device ( 11 ) for comparison with a reference signal is supplied, and with a control device ( 8 ) with which the setting The value P can be changed until the setting value P assigned to the angle of rotation (α) is found.
2. Device according to claim 1, characterized in that the adjusting device ( 11 ), the comparator ( 6 ) and the control device ( 8 ) are monolithically integrated on the semiconductor substrate.
3. Apparatus according to claim 1 or 2, characterized in that the adjusting device ( 11 ) can be controlled digitally.
4. Device according to one of claims 1 to 3, characterized in that the adjusting device ( 11 ) has a resistance chain ( 7 , 7 '), the resistors are formed and connected in series so that an output signal for a setting value P (a , a ', b, b') can be tapped, which corresponds to the function value w assigned to the setting value P of the function f.
5. Device according to one of claims 1 to 4, characterized in that the Hall sensors ( 1 , 2 ) are arranged so that the first measurement signal (x) is a sine signal and the second measurement signal (y) is a cosine signal, each magnetic field sensor ( 1 , 2 ) is connected to an inversion element ( 3 , 4 ) for inverting the respective measurement signal (x, y).
6. Device according to one of claims 1 to 5, characterized in that between the Hall sensors ( 1 , 2 ) and the resistance chain ( 7 , 7 ') a signal exchange element ( 5 ) is provided.
7. Device according to one of claims 1 to 6, characterized in that the resistance chain ( 7 , 7 ') is designed so that the tapped output signal corresponds to the measurement signal multiplied by a tangent function (x).
8. The device according to claim 7, characterized in that the comparator ( 6 ) for difference formation, the output signal of the resistor chain ( 7 , 7 ') and the other measurement signal (y) are supplied.
9. Device according to one of claims 2 to 8, characterized in that the adjusting device ( 11 ) with an at least one measurement signal (x = B · f (α)) connected amount resistance chain ( 9 , 9 '), which it is designed that a unique magnitude signal can be tapped for each setting value P of the angular range, which corresponds to the measuring signal (x = B · f (α)) multiplied by the reciprocal of the function f at the point of the setting value P.
10. The device according to claim 9, characterized in that the amount signal measurement signal multiplied by the reciprocal of the cosine function (x = B · f (α)) corresponds to the position of the setting value P.
11. The device according to claim 9 or 10, characterized in that the amount signal and a reference signal for difference formation on a comparator will.  
12. Device according to one of claims 1 to 6, characterized in that the first measurement signal at one end and the second measurement signal at another end of the resistance chain ( 7 , 7 ') are supplied, and the output signal of the resistance chain ( 7 , 7th ') The comparator ( 6 ) is supplied with a reference signal.
13. The apparatus according to claim 12, characterized in that the first measurement signal at one end and the second measurement signal at another end of the amount resistance chain ( 9 , 9 ') is supplied.
14. Device according to one of claims 1 to 13, characterized in that with the control device ( 8 ) due to the output signal of the comparator ( 6 ), the resistance chain ( 7 , 7 ') or the amount resistance chain ( 9 , 9 '), the inversion elements ( 3 , 4 ) and the signal exchange element ( 5 ) are controlled, and the control device ( 8 ) has an output for outputting a signal representing the angle of rotation (α).
15. Device according to one of claims 1 to 14, characterized in that a third and a fourth Hall sensor is provided, the third Hall sensor to the first ( 1 ) and the fourth Hall sensor to the second ( 2 ) is connected antiparallel and the Hall sensors are each offset by 90 ° to one another, so that together they form a square arrangement, the anti-parallel Hall sensors being arranged offset by 180 ° to one another.
16. Device according to one of claims 2 to 15, characterized in that the Measuring connections and the signal supply connections of the respective Hall sensor in can be switched orthogonally within one measuring cycle, and the measuring signals of two different switching states for signal evaluation compared will.
17. Device according to one of claims 2 to 16, characterized in that a Compensation device for compensating the offset of the respective Hall sensor and the device is provided.
DE19944422868 1994-06-30 1994-06-30 Device for determining an angle of rotation of a magnet Expired - Fee Related DE4422868C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944422868 DE4422868C2 (en) 1994-06-30 1994-06-30 Device for determining an angle of rotation of a magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944422868 DE4422868C2 (en) 1994-06-30 1994-06-30 Device for determining an angle of rotation of a magnet

Publications (2)

Publication Number Publication Date
DE4422868A1 true DE4422868A1 (en) 1996-01-11
DE4422868C2 DE4422868C2 (en) 1997-08-21

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DE4440214A1 (en) * 1994-11-10 1996-05-15 Itt Ind Gmbh Deutsche Rotation transmitter using rotatable magnet systems with magnetic North and South poles
DE19539134A1 (en) * 1995-10-20 1997-04-24 Dieter Dipl Phys Schoedlbauer Evaluation method for contactless distance or angle transducer with sinusoidal track signals
DE19719564A1 (en) * 1997-05-09 1998-11-12 Mannesmann Vdo Ag Method for measuring the angle of rotation of a rotatable shaft, in particular a rotatable switch and device for carrying out the method
DE10334869B3 (en) * 2003-07-29 2004-09-16 Tech3 E.K. Rotation angle sensor has a rotating shaft with attached permanent magnets, with angular measurements based on both axial displacement of the shaft and sinusoidal and cosinusoidal signals generated by it
WO2005085892A1 (en) * 2004-03-02 2005-09-15 Austriamicrosystems Ag Magnetic field sensor and method for the operation thereof
DE102011103576A1 (en) 2011-05-30 2012-12-06 Megamotive Gmbh & Co. Kg Rotational angle sensor, has sensor device comprising magnet and potentiometer wiper that are displaced along shaft during rotation of sensor device in linear manner, and sensor element attached to magnet and wiper
US10042010B2 (en) 2012-02-01 2018-08-07 Ams Ag Hall sensor and sensor arrangement

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4440214A1 (en) * 1994-11-10 1996-05-15 Itt Ind Gmbh Deutsche Rotation transmitter using rotatable magnet systems with magnetic North and South poles
DE19539134A1 (en) * 1995-10-20 1997-04-24 Dieter Dipl Phys Schoedlbauer Evaluation method for contactless distance or angle transducer with sinusoidal track signals
DE19539134C2 (en) * 1995-10-20 2001-05-23 Ruf Electronics Gmbh Evaluation method for non-contact measuring displacement / angle sensors with sinusoidal track signals
DE19719564A1 (en) * 1997-05-09 1998-11-12 Mannesmann Vdo Ag Method for measuring the angle of rotation of a rotatable shaft, in particular a rotatable switch and device for carrying out the method
DE10334869B3 (en) * 2003-07-29 2004-09-16 Tech3 E.K. Rotation angle sensor has a rotating shaft with attached permanent magnets, with angular measurements based on both axial displacement of the shaft and sinusoidal and cosinusoidal signals generated by it
US6894487B2 (en) 2003-07-29 2005-05-17 Tech3 E.K. Angle of rotation sensor
WO2005085892A1 (en) * 2004-03-02 2005-09-15 Austriamicrosystems Ag Magnetic field sensor and method for the operation thereof
US7825657B2 (en) 2004-03-02 2010-11-02 Austriamicrosystems Ag Magnetic field sensor and method for the operation thereof
DE102011103576A1 (en) 2011-05-30 2012-12-06 Megamotive Gmbh & Co. Kg Rotational angle sensor, has sensor device comprising magnet and potentiometer wiper that are displaced along shaft during rotation of sensor device in linear manner, and sensor element attached to magnet and wiper
US10042010B2 (en) 2012-02-01 2018-08-07 Ams Ag Hall sensor and sensor arrangement

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