CN106403806A - Angular position sensor, angular position measurement system and angular position measurement method - Google Patents
Angular position sensor, angular position measurement system and angular position measurement method Download PDFInfo
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- CN106403806A CN106403806A CN201610899490.2A CN201610899490A CN106403806A CN 106403806 A CN106403806 A CN 106403806A CN 201610899490 A CN201610899490 A CN 201610899490A CN 106403806 A CN106403806 A CN 106403806A
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- angular position
- position sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention provides an angular position sensor, an angular position measurement system and an angular position measurement method. The angular position sensor comprises an excitation coil, M receiving coils and a rotor, wherein the M receiving coils are coaxial with the excitation coil. The M receiving coils, a first capacitor and an operational amplifier form an LC oscillation circuit, and two adjacent receiving coils have a deflection angle therebetween, wherein M is a positive integer greater than or equal to 2. By using a relation between a rotating angle of the rotor and output signals of the M receiving coils, the rotating angle of the rotor can be acquired under the premise of acquiring the output signals of the M receiving coils, and thus measuring angle variations is realized. The rotor is not contacted with the receiving coils, that is, mechanical wear does not exist, so that the weather resistance and the vibration resistance of the angular position measurement system are improved. Meanwhile, the cost can be effectively reduced.
Description
Technical field
The present invention relates to electromechanical control field, especially a kind of angular position sensor, angle position measuring system and side
Method.
Background technology
Angular position sensor has a wide range of applications on automobile, such as liquid level sensor, accelerating throttle pedal, air throttle
Body, power-assisted steering, vehicle body horizon sensor etc..At present on existing auto parts and components, the main angular position sensor adopting
It is potentiometer contact type angle sensor and two kinds of Hall type non-contact angle sensor.
Potentiometer type angular transducer is early stage commonly used touch sensor, and it makes contact point change on resistive film
Becoming position, thus changing the ratio of upper and lower resistance, realizing the change with external position for the output end voltage.But, potentiometer type angle
Degree sensor is inevitably present the problem of the easy abrasion of contact and resistive film, and if is mixed into contact and resistance are intermembranous
The dirts such as dust, then can affect certainty of measurement.In addition, resistance also can change under vibration.Therefore, potentiometer type
Angular transducer exists substantially not enough at aspects such as against weather, vibration resistances.
Hall-type angular position sensor is the noncontacting proximity sensor of current main-stream, and it is to be made according to Hall effect
A kind of magnetic field sensor, is typically made up of external magnetic field and Hall chip, by the change of Hall voltage response location.Hall-type angle
Sensor has the advantages that contactless no abrasion, small volume, against weather is good, vibration resistance is good, high precision, but due to hall sensing
Magnet is contained, EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) performance is relatively poor, cost in device
Higher, the poor-performing of resistance to temperature drift.
Content of the invention
It is an object of the invention to provide a kind of angular position sensor, angle position measuring system and method, to solve
Existing angular position sensor is in against weather, vibration resistance, resistance to temperature drift is not enough and the problem of high cost.
In order to achieve the above object, the invention provides a kind of angular position sensor, including：One excitation coil and institute
State M coaxial receiving coil of excitation coil and the rotor coaxial with described excitation coil；Wherein, described M receiving coil position
Inside described excitation coil, described rotor is located at one end of the plurality of receiving coil, and has between one and receiving coil between
Gap；Each circle of described M receiving coil all by both forward and reverse directions coiling, has a deflection angle between two adjacent receiving coils
Degree, M is the positive integer more than or equal to 2.
Preferably, in above-mentioned angular position sensor, M is 2 or 3.
Preferably, in above-mentioned angular position sensor, each circle of each receiving coil has n times forward direction coiling and anti-
To coiling, the coiling of described forward direction and reverse coiling intersection are carried out, and wherein, N is the positive integer more than or equal to 1.
Preferably, in above-mentioned angular position sensor, described deflection angle=360/ (2N*M), wherein, N be more than
Positive integer equal to 1, M is 2.
Preferably, in above-mentioned angular position sensor, described deflection angle=360/ (N*M), wherein, N be more than
Positive integer equal to 1, M is 3.
Preferably, in above-mentioned angular position sensor, described rotor comprises N number of rotor blade, wherein, N be more than
Positive integer equal to 1.
Preferably, in above-mentioned angular position sensor, N number of rotor blade is uniformly distributed in described rotor blade and is located
Plane on, N is the positive integer more than or equal to 1.
Preferably, in above-mentioned angular position sensor, described rotor covers described M receiving coil cross section
The half of area.
Preferably, in above-mentioned angular position sensor, the shape phase of described excitation coil and receiving coil cross section
With.
Preferably, in above-mentioned angular position sensor, the shape of described excitation coil cross section is polygon, circle
Or it is oval.
Present invention also offers a kind of angle position measuring system, including：Just like any one institute in claim 1 to 8
Angular position sensor, one first electric capacity, an operational amplifier, a demodulation phase discriminator and the controller stated；Wherein,
Excitation coil in described angular position sensor and M receiving coil, the first electric capacity and operational amplifier group
Become a LC oscillating circuit, to produce a pumping signal；
Described demodulation phase discriminator is used for obtaining the width of the output signal of M receiving coil in described angular position sensor
Value and phase place；And
Described controller is used for the amplitude of the output signal according to described M receiving coil and phase place obtains described angle position
Put the anglec of rotation of rotor in sensor, M is the positive integer more than or equal to 2.
Preferably, in above-mentioned angle position measuring system, also include：One bandwidth-limited circuit, is used for leaching described
Interference signal in the output signal of receiving coil.
Preferably, in above-mentioned angle position measuring system, also include：One from gain amplifying circuit, for amplifying filter
Go out the output signal of the described M receiving coil after interference signal, described demodulation phase discriminator is used for obtaining the described M after amplifying
The amplitude of the output signal of individual receiving coil and phase place.
Preferably, in above-mentioned angle position measuring system, described demodulation phase discriminator includes：One multiplier and one low
Bandpass filter circuit；Wherein, described multiplier be used for by the output signal of described M receiving coil be separated into one group of high-frequency signal with
One group of low frequency signal；Described low-pass filter circuit is used for filtering out described high-frequency signal, to obtain described low frequency signal.
Preferably, in above-mentioned angle position measuring system, each circle of described M receiving coil have n times positive around
Line and reverse coiling, the frequency of described high-frequency signal is 2 times of the carrier frequency of the output signal of described M receiving coil, institute
The amplitude stating low frequency signal is related to the amplitude of described M receiving coil output signal, and wherein, N is just whole more than or equal to 1
Number, M is 2 or 3.
Preferably, in above-mentioned angle position measuring system, each circle of described M receiving coil have n times positive around
Line and reverse coiling, the amplitude of the output signal of described M receiving coil is 2 times of the amplitude of described low frequency signal, wherein, N
It is the positive integer more than or equal to 1, M is 2 or 3.
Preferably, in above-mentioned angle position measuring system, the carrier frequency of the output signal of described M receiving coil
Equal with the frequency of described pumping signal.
The present invention more provides a kind of method carrying out angle position measurement using above-mentioned angle position measuring system, its
It is characterised by,
Obtain amplitude y1, y2...yM of the output signal of M receiving coil in angular position sensor；
One plane is divided into 4M quadrant；
Amplitude y1, y2...yM of the output signal according to described M receiving coil determines that rotor is located in l-th quadrant；
Amplitude y1, y2...yM of the output signal according to described M receiving coil obtains the anglec of rotation of described rotor；
Wherein, M is 2 or 3,1≤L≤4M, and L is positive integer.
In the angular position sensor that the present invention provides, angle position measuring system and method, angular position sensor
Include an excitation coil and the M receiving coil coaxial with described excitation coil and a rotor, described angular position sensing
M receiving coil in device, the first electric capacity and operational amplifier form a LC oscillating circuit, and have between M receiving coil
One deflection angle, wherein, M is the positive integer more than or equal to 2, is believed with the output of M receiving coil using the anglec of rotation of rotor
Relation between number, on the premise of the output signal obtaining M receiving coil, you can obtain the anglec of rotation of rotor, thus
Realize the measurement to angle change.Due to noncontact between rotor and receiving coil, i.e. mechanical abrasion, thus improve described
The against weather of angle position measuring system and vibration resistance.Meanwhile, cost can be effectively reduced.
Brief description
Fig. 1 is the overlooking the structure diagram of angular position sensor in the embodiment of the present invention；
Fig. 2 is the structural representation of angle position measuring system in the embodiment of the present invention；
Fig. 3 is the corresponding relation of the lower receiving coil output voltage of excitation field effect and rotor-position in the embodiment of the present invention
Schematic diagram；
Fig. 4 is the schematic diagram that 0-360 ° of plane is divided in the embodiment of the present invention 8 quadrants；
Fig. 5 is the flow chart of angle position measuring method in the embodiment of the present invention；
In figure：101- angular position sensor；1011- excitation coil；1012- receiving coil；1013- rotor；102-
One electric capacity；103- operational amplifier；104- demodulates phase discriminator；1041- multiplier；1042- low pass filter；105- controls
Device；106- bandwidth-limited circuit；107- is from gain amplifying circuit.
Specific embodiment
Below in conjunction with schematic diagram, the specific embodiment of the present invention is described in more detail.According to description below and
Claims, advantages and features of the invention will become apparent from.It should be noted that, accompanying drawing is all in the form of very simplification and equal
Using non-accurately ratio, only in order to purpose that is convenient, lucidly aiding in illustrating the embodiment of the present invention.
Embodiments provide a kind of angular position sensor 101, as shown in figure 1, Fig. 1 is described angle position passing
The overlooking the structure diagram of sensor 101.Described angular position sensor 101 includes：One excitation coil 1011, M receiving coil
1012 and a rotor 1013, described excitation coil 1011, M receiving coil 1012 and rotor 1013 are coaxial.Described M reception
Coil 1012 is located at the inner side of described excitation coil 1011, and described rotor 1013 is located at one end of described M receiving coil 1012,
And have a gap and described receiving coil 1012 between, there is a deflection angle between two adjacent receiving coils 1012, M is big
In the positive integer equal to 2, further, M is 2 or 3.
Each circle of each receiving coil 1012 is all by both forward and reverse directions coiling.Specifically, each receiving coil 1012 described
Each circle have the n times forward direction coiling and reverse coiling of n times, first carry out n times forward direction coiling and carry out the reverse coiling of n times, wherein, N again
It is the positive integer more than or equal to 1.Further, when N is 1, each circle of each receiving coil 1012 is to receive in coiling
One end of coil is fixed, the other end first along positive direction (clockwise) after certain length, further along opposite direction (counterclockwise
Direction) around identical length, and return to the adjacent one end of described receiving coil.When the positive integer that N is more than or equal to 2, each
Each circle of receiving coil is that one end of receiving coil is fixed in coiling, and the other end completes along positive direction (clockwise)
N times coiling, then completes n times coiling further along opposite direction (counterclockwise), and returns to the adjacent one end of described receiving coil.
In above-mentioned, positive direction is clockwise, and opposite direction is inverse time needle method, likewise, can also be positive direction be counterclockwise
Direction, opposite direction is clockwise.
When M is 2, described angle of eccentricity=360/ (2N*M), wherein, N represents each circle of each receiving coil 1012
The number of times of positive coiling, is the positive integer more than or equal to 1.For example, when N is 1, i.e. when having two receiving coils 1012 (for example,
First receiving coil and the second receiving coil), and each circle of each receiving coil 1012 only carries out once positive coiling and anti-
To during coiling, described angle of eccentricity=360/ (2N*M)=360/ (2*1*2)=90 degree.I.e. described two receiving coils 1012 it
Between in 90 degree of angle, further, in 90 ° between one end of described first receiving coil and one end of the second receiving coil
Angle.
When M is 3, described deflection angle=360/ (N*M), wherein, N is the positive integer more than or equal to 1, and M is 3.Equally,
When N is 1, described deflection angle=360/ (N*M)=360/ (1*3)=120 degree.I.e. between described two receiving coils 1012
In 120 degree of angle, further, between one end of described first receiving coil and one end of the second receiving coil it is in 120 °
Angle.
Described rotor 1013 comprises N number of rotor blade, and described N number of rotor blade is uniformly distributed in described rotor blade institute
Plane, N is the positive integer more than or equal to 1.The number of rotor blade that i.e. described rotor 1013 comprises and described reception line
In each circle of circle, the number of times of positive coiling or reverse coiling is equal.Further, described rotor 1013 covers described reception
The half of the area of coil section, that is, described rotor 1013 cover in described receiving coil 1012 what positive coiling was surrounded
Region, or cover reverse coiling area defined in described receiving coil 1012.It should be noted that working as described rotor
1013 when covering in described receiving coil 1012 positive coiling area defined, cannot cover described receiving coil 1012
In reverse coiling area defined.Equally, when described rotor 1013 covers reverse coiling institute in described receiving coil 1012
During the region surrounding, positive coiling area defined in described receiving coil 1012 cannot be covered.
Specifically, when N is 1, each circle of described receiving coil 1012 only carries out once positive coiling and once anti-
To coiling, then it is that rotor 1013 only comprises a rotor blade.Described rotor blade just covers in described receiving coil 1012
To coiling area defined, but reverse coiling area defined in described receiving coil 1012 can not be covered.Or cover
Cover reverse coiling area defined in described receiving coil 1012, but can not cover positive in described receiving coil 1012
Coiling area defined.
When N is 2, each circle of described receiving coil 1012 carries out 2 positive coilings and 2 reverse coilings, then described
Rotor 1013 includes 2 rotor blades.Each circle of described receiving coil 1012 is in turn divided into：First positive coiling surrounds
Region, the area that surrounds of the region that surrounds of the region that surrounds of the first reverse coiling, the second positive coiling and the second reverse coiling
Domain.Due to described receiving coil 1012 each circle when carrying out coiling the length of positive coiling and reverse coiling be equal,
And then make the region that region, the second positive coiling that region, the first reverse coiling that the first positive coiling surrounds surround surround
And second area equation in region that surround of reverse coiling.This 2 rotor blades are covered each by residence and state the first positive coiling
The region that the region surrounding and the second positive coiling surround, but the region that the described first reverse coiling surrounds and the can not be covered
The region that two reverse coilings surround.Or this 2 rotor blades be covered each by residence state the region that the first reverse coiling surrounds and
The region that second reverse coiling surrounds, but the region that the described first positive coiling surrounds can not be covered and the second positive coiling is enclosed
The region becoming.
When N is more than 2, similar with the situation that N is equal to 2, by that analogy, it is that those skilled in the art are to understand,
This repeats no more.The value of N is bigger, and the certainty of measurement of described angular position sensor 101 is higher.
Described excitation coil 1011 is identical with the shape of the cross section of receiving coil 1012, described excitation coil 1011 and connecing
The cross section of take-up circle 1012 is but not limited to polygon, circular or oval.It should be noted that working as described excitation coil
1011 and receiving coil 1012 cross section be shape changeable when, described angular position sensor 101 can also be used to measure straight line
Distance.Preferably, the cross section of described excitation coil 1011 and receiving coil 1012 is circle, to reduce consumptive material, and then reduces
Cost.When the cross section of described excitation coil 1011 and receiving coil 1012 is circular, the rotor blade of described rotor 1013
Radius be more than or equal to described receiving coil 1012 radius.Preferably, the radius of the rotor blade of described rotor 1013 is equal to
The radius of described receiving coil 1012, to reduce invalid covering, and then reduces cost.
The embodiment of the present invention additionally provides a kind of angle position measuring system, as shown in Figure 2.Fig. 2 shows the present embodiment
The structural representation of middle angle position measuring system.Including：As mentioned above angular position sensor 101, one first electric capacity 102,
One operational amplifier 103, one demodulation phase discriminator 104 and a controller 105.Wherein, in described angular position sensor 101
M receiving coil 1012, the first electric capacity 102 and operational amplifier 103 form a LC oscillating circuit.
Described angle position measuring system also includes a bandwidth-limited circuit 106 and from gain amplifying circuit 107, described
Band filter 106 is used for leaching the interference signal in the output signal of described receiving coil 1012, described and by primary signal
Effectively amplify, improve the signal to noise ratio of signal.Described from gain amplifying circuit 107 be used for amplify leach the described M after interference signal
The output signal of individual receiving coil 1012, described demodulation phase discriminator 104 is used for obtaining the described M receiving coil after amplifying
The amplitude of output signal and phase place.The described effect from gain amplifying circuit 104 is that had the output signal of receiving coil
Effect is amplified, and obtains high-precision amplitude variable signal, for the position calculation of rotor 1013 in subsequently described angular position sensor
Reference is provided.Because the output amplitude of the output signal of receiving coil 1012 changes very greatly, using the amplifying circuit of fixed gain
It is difficult to ensure that obtaining sufficiently high AD (analog digital conversion) sampling precision in full signal section, therefore, the system employs a set of increasing certainly
Beneficial amplifying circuit, is characterized in when the amplitude of input signal changes, and its internal circuit can be defeated with automatic identification signal
Enter amplitude, through the amplification of internal special resistor network Regulate signal, more corresponding amplification is converted into electricity
Pressure value, then after fixed gain amplifier amplifies, input to analog to digital conversion circuit.
Each circle of each receiving coil 1012 in described angular position sensor 101 is all by both forward and reverse directions coiling.Tool
Body, each circle of each receiving coil 1012 described has n times forward direction coiling and the reverse coiling of n times, and the coiling of described forward direction and
Reversely coiling intersects and carries out, and wherein, N is the positive integer more than or equal to 1.Further, when N is 1, each receiving coil 1012
Each circle be that one end of receiving coil is fixed in coiling, the other end first along positive direction (clockwise) around certain length
Afterwards, further along opposite direction (counterclockwise) around identical length, and return to the adjacent one end of described receiving coil.When N is big
When positive integer equal to 2, each circle of each receiving coil is that one end of receiving coil is fixed in coiling, the other end along
Positive direction (clockwise) completes n times coiling, then completes n times coiling further along opposite direction (counterclockwise), and returns to
The adjacent one end of described receiving coil.In above-mentioned, positive direction is clockwise, and opposite direction is inverse time needle method, likewise,
Can also be positive direction be counterclockwise, opposite direction is clockwise.
Described demodulation phase discriminator 104 is used for obtaining the defeated of M receiving coil 1012 in described angular position sensor 101
Go out amplitude and the phase place of signal, M is the positive integer more than or equal to 2.Specifically, described demodulation phase discriminator 104 includes：One multiplication
Device 1041 and a low-pass filter circuit 1041.Wherein, described multiplier 1041 is used for the described M receiving coil after amplifying
1012 output signal is separated into one group of high-frequency signal and one group of low frequency signal；Described low-pass filter circuit 1042 is used for filtering out
Described high-frequency signal, to obtain described low frequency signal, M is the positive integer more than or equal to 2.Wherein, described M receiving coil 1012
Each circle have the n times forward direction coiling and reverse coiling of n times, the frequency of described high-frequency signal is the output of described M receiving coil
2 times of the carrier frequency of signal, the amplitude of described low frequency signal is related to the amplitude of described M receiving coil output signal, enters
One step, the amplitude of the output signal of described M receiving coil is 2 times of the amplitude of described low frequency signal.Further, institute
The carrier frequency of output signal stating M receiving coil is equal with the frequency of described pumping signal.Wherein, N is more than or equal to 1
Positive integer, M is 2 or 3.
Described controller 105 is used for the output signal according to M receiving coil 1012 in described angular position sensor 101
Amplitude and phase place obtain described angular position sensor in rotor 1013 the anglec of rotation, M is the positive integer more than or equal to 2.
In the present embodiment, include 2 receiving coils in described angular position sensor, and 2 receiving coils is every
One circle carries out once positive coiling and once reversely coiling.Rotor in described angular position sensor includes a rotor leaf
Piece.Further, described rotor blade is the sheet metal of magnetic conduction.
In 2uH, described LC oscillating circuit can produce my 5MHz of frequency to the inductance of described excitation coil, and amplitude is 1 volt
Special high-frequency ac voltage signal, i.e. pumping signal.After energising, described excitation coil is in the work of described high-frequency ac voltage signal
With under, produce high-frequency alternating excitation field.Each circle of 2 receiving coils in described angular position sensor is carried out once
Positive coiling and once reversely coiling, to offset the impact of described excitation field.Work in the excitation field of described high-frequency alternating
With under, described rotor blade can induce vortex, the intensity of described vortex depends on the size of described excitation field, described turn
On blades, the vortex of alternation also can produce the magnetic field of alternation, the change of position with described rotor blade for the magnetic field that it produces and
It is continually changing.In the presence of each receiving coil is vortexed alternating magnetic field in described rotor blade, the induction electromotive force U0 of its output
Related with the position of described rotor blade, as shown in Figure 3.
Specific it can be seen that when described rotor blade covers the upper half-turn of receiving coil completely, described receiving coil
The output amplitude of induced voltage reach positive maximum, as shown in the mark 1 in Fig. 3.When described rotor blade turns over clockwise
After 90 degree, described rotor blade covers the area equation of lower branch on described receiving coil, but upper lower branch is faradic
In opposite direction, the voltage output amplitude leading to receiving coil is 0, as shown in the mark 2 in Fig. 3.When rotor continues to ratate 90 degrees,
When described rotor blade covers the lower branch of receiving coil completely, the output amplitude of the output signal of described receiving coil reaches instead
To maximum, as shown in the mark 3 in Fig. 3.After described rotor blade continues to ratate 90 degrees, described rotor blade covers reception line
On circle, the area of lower branch is again equal, and the amplitude of its output voltage is again equal to O, as shown in the mark 4 in Fig. 3.To sum up institute
State, the output amplitude of receiving coil is related with the position of rotor, just permissible by the output amplitude and phase place of measurement receiving coil
Determine the position of rotor.
The embodiment of the present invention additionally provides a kind of side carrying out angle position measurement using described angle position measuring system
Method, comprises the following steps：Obtain amplitude y1, y2...yM of the output signal of M receiving coil；0-360 ° of plane is divided
For 4M quadrant；Amplitude y1, y2...yM of the output signal according to described M receiving coil determines that rotor is located at l-th quadrant
In；And determine the anglec of rotation of described rotor.Wherein, M is 2 or 3,1≤L≤4M, and L is positive integer.
Connect example, N is 1, M is 2.I.e. the amplitude of the output signal of 2 receiving coils is respectively y1 and y2, by 0-360 °
Plane is divided into 8 quadrants, as shown in figure 4, wherein, π represents 180 °.Then 1≤L≤8, and L is positive integer.
Referring to Fig. 5, Fig. 5 is the flow chart of angle position measuring method in the embodiment of the present invention.Obtain 2 reception lines first
Step S1 in amplitude y1 of output signal of circle and y2, such as Fig. 5.Then 0-360 ° of plane is divided into 8 quadrants, such as schemes
Step S2 in 5.Secondly, amplitude y1 of the output signal according to described 2 receiving coils and y2 determine that rotor blade is located at L
Individual quadrant, 1≤L≤8, and L are positive integer, step S3 in such as Fig. 5.
Specifically, refer to Fig. 4, Fig. 4 is the schematic diagram that 0-360 ° of plane is divided into 8 quadrants.As y1 ＞ 0 and y2
During ＞ 0, described rotor blade is located in I quadrant and ii quadrant.Further, the size of the value according to y1 and y2, enters one
Step determines that described rotor blade is in described I quadrant or ii quadrant.Specifically, as y2 ＞ y1, described rotor leaf
Piece is located in I quadrant, then determines anglec of rotation φ of described rotor blade according to y1 and y2, φ=arcsin (y1), such as
Step S4 in Fig. 5.Otherwise, when y2 is less than y1, described rotor blade is located in ii quadrant, now, φ=90-arcsin
(y2), as step S4 in Fig. 5.
As y1 ＞ 0 and y2 ＜ 0, described rotor blade is located in ii I quadrant and iv quadrant.Further, according to
The size of the absolute value of y1 and y2, further determines that described rotor blade is in described ii I quadrant or iv quadrant.Tool
Body, as | y1 | ＞ | y2 |, described rotor blade is located in ii I quadrant, then determines described rotor leaf according to y1 and y2
Anglec of rotation φ of piece, step S4 in φ=90+arcsin (| y2 |), such as Fig. 5.Otherwise, as | y1 | ＜ | y2 |, described turn
Blades are located in iv quadrant, and now, φ=180-arcsin (| y1 |), as step S4 in Fig. 5.
As y1 ＜ 0 and y2 ＜ 0, described rotor blade is located in V quadrant and VI quadrant.Further, according to y1
With the size of the absolute value of y2, further determine that described rotor blade is in described V quadrant or VI quadrant.Specifically
, as | y2 | ＞ | y1 |, described rotor blade is located in V quadrant, then determines described rotor blade according to y1 and y2
Anglec of rotation φ, step S4 in φ=180+arcsin (| y1 |), such as Fig. 5.Otherwise, as | y2 | ＜ | during y1, described rotor leaf
Piece is located in VI quadrant, and now, φ=270-arcsin (| y2 |), as step S4 in Fig. 5.
As y1 ＜ 0 and y2 ＞ 0, described rotor blade is located in VII quadrant and VII quadrant.Further, according to
The size of the absolute value of y1 and y2, further determines that described rotor blade is in described VII quadrant or VII quadrant.
Specifically, as | y1 | ＞ | y2 |, described rotor blade is located in VII quadrant, then determines described rotor according to y1 and y2
Anglec of rotation φ of blade, step S4 in φ=270+arcsin (| y2 |), such as Fig. 5.Otherwise, as | y1 | ＜ | y2 |, institute
State rotor blade to be located in VII quadrant, now, φ=360-arcsin (| y1 |), as step S4 in Fig. 5.
In the present embodiment, acquisition is the anglec of rotation that rotor is with respect to its initial position, and the initial position of rotor
Can freely demarcate, therefore easy to use.
When M is 3, that is, when including 3 receiving coils in described angular position sensor, 0-360 ° of plane is drawn
It is divided into 12 quadrants, then the size of amplitude y1, y2 of the output signal according to 3 receiving coils obtaining and y3 (just includes
The size of negative and absolute value) determine that rotor blade is particularly located in which quadrant in 0-12 quadrant, then using 3
Amplitude y1, y2 of the output signal of receiving coil and y3 calculate anglec of rotation φ of rotor blade.During using 3 receiving coils
The precision of anglec of rotation φ of rotor blade is higher than using precision during 2 receiving coils.Therefore, select according to actual needs
The receiving coil of different numbers is to adapt to different required precisions.
To sum up, in angular position sensor provided in an embodiment of the present invention, angle position measuring system and method, angle
Position sensor includes an excitation coil and the M receiving coil coaxial with described excitation coil and a rotor, described angle
M receiving coil in degree position sensor, the first electric capacity and operational amplifier form a LC oscillating circuit, and M reception
Have a deflection angle between coil, wherein, M is >=2 positive integer, using rotor the anglec of rotation and M receiving coil defeated
Go out the relation between signal, on the premise of the output signal obtaining M receiving coil, you can obtain the anglec of rotation of rotor,
Thus realizing the measurement to angle change.Due to noncontact between rotor and receiving coil, i.e. mechanical abrasion, thus improve
The against weather of described angle position measuring system and vibration resistance.Meanwhile, cost can be effectively reduced.
Above are only the preferred embodiments of the present invention, the present invention is not played with any restriction effect.Any affiliated
Those skilled in the art, in the range of without departing from technical scheme, to the invention discloses technical scheme and
Technology contents make any type of equivalent or modification etc. and change, and all belong to the content without departing from technical scheme, still
Belong within protection scope of the present invention.
Claims (18)
1. a kind of angular position sensor is it is characterised in that include：The one excitation coil M coaxial with described excitation coil connects
Take-up circle and the rotor coaxial with described excitation coil；Wherein, described M receiving coil is located inside described excitation coil, institute
State one end that rotor is located at the plurality of receiving coil, and have a gap and receiving coil between；Described M receiving coil every
One circle, all by both forward and reverse directions coiling, has a deflection angle between two adjacent receiving coils, M is the positive integer more than or equal to 2.
2. angular position sensor as claimed in claim 1 is it is characterised in that M is 2 or 3.
3. angular position sensor as claimed in claim 2 is it is characterised in that each circle of each receiving coil is just having n times
To coiling and the reverse coiling of n times, the coiling of described forward direction and reverse coiling intersection are carried out, and wherein, N is the positive integer more than or equal to 1.
4. angular position sensor as claimed in claim 3 is it is characterised in that described deflection angle=360/ (2N*M), its
In, N is the positive integer more than or equal to 1, and M is 2.
5. angular position sensor as claimed in claim 3 is it is characterised in that described deflection angle=360/ (N*M), its
In, N is the positive integer more than or equal to 1, and M is 3.
6. angular position sensor as claimed in claim 3 is it is characterised in that described rotor comprises N number of rotor blade, its
In, N is the positive integer more than or equal to 1.
7. angular position sensor as claimed in claim 6 is it is characterised in that N number of rotor blade is uniformly distributed in described turning
In the plane that blades are located, N is the positive integer more than or equal to 1.
8. angular position sensor as claimed in claim 7 is it is characterised in that described rotor covers described M reception line
The half of the area of circle cross section.
9. angular position sensor as claimed in claim 1 is it is characterised in that described excitation coil and receiving coil cross section
Shape identical.
10. angular position sensor as claimed in claim 9 is it is characterised in that the shape of described excitation coil cross section is
Polygon, circular or oval.
A kind of 11. angle position measuring systems are it is characterised in that include：Just like described in any one in claim 1 to 8
Angular position sensor, one first electric capacity, an operational amplifier, a demodulation phase discriminator and a controller；Wherein,
M receiving coil in described angular position sensor, the first electric capacity and operational amplifier form a LC oscillating circuit,
To produce a pumping signal；
Described demodulation phase discriminator be used for obtaining in described angular position sensor the amplitude of the output signal of M receiving coil with
Phase place；
Described controller is used for the amplitude of the output signal according to described M receiving coil and phase place obtains described angle position and passes
The anglec of rotation of rotor in sensor, M is the positive integer more than or equal to 2.
12. angle position as claimed in claim 11 measuring systems are it is characterised in that also include：One bandwidth-limited circuit, uses
Interference signal in the output signal leaching described receiving coil.
13. angle position as claimed in claim 12 measuring systems are it is characterised in that also include：One from gain amplifying circuit,
For amplifying the output signal leaching the described M receiving coil after interference signal, described demodulation phase discriminator is put for acquisition
The amplitude of the output signal of described M receiving coil after big and phase place.
14. angle position as claimed in claim 11 measuring systems are it is characterised in that described demodulation phase discriminator includes：One
Multiplier and a low-pass filter circuit；Wherein, described multiplier is used for for the output signal of described M receiving coil being separated into one
Group high-frequency signal and one group of low frequency signal；Described low-pass filter circuit is used for filtering out described high-frequency signal, described low to obtain
Frequency signal.
15. angle position as claimed in claim 14 measuring systems are it is characterised in that each circle of described M receiving coil
There are n times forward direction coiling and reverse coiling, the frequency of described high-frequency signal is the carrier frequency of the output signal of described M receiving coil
2 times of rate, the amplitude of described low frequency signal is related to the amplitude of described M receiving coil output signal, wherein, N be more than etc.
In 1 positive integer, M is 2 or 3.
16. angle position as claimed in claim 15 measuring systems are it is characterised in that each circle of described M receiving coil
There are n times forward direction coiling and reverse coiling, the amplitude of the output signal of described M receiving coil is the amplitude of described low frequency signal
2 times, wherein, N is the positive integer more than or equal to 1, and M is 2 or 3.
17. angle position as claimed in claim 15 measuring systems are it is characterised in that the output of described M receiving coil is believed
Number carrier frequency equal with the frequency of described pumping signal.
18. a kind of carry out angle position survey using the angle position measuring system as described in any one in claim 11 to 17
Amount method it is characterised in that
Obtain amplitude y1, y2...yM of the output signal of M receiving coil in angular position sensor；
One plane is divided into 4M quadrant；
Amplitude y1, y2...yM of the output signal according to described M receiving coil determines that rotor is located in l-th quadrant；
Amplitude y1, y2...yM of the output signal according to described M receiving coil obtains the anglec of rotation of described rotor；
Wherein, M is 2 or 3,1≤L≤4M, and L is positive integer.
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