CN112833923A - Inductance type angular position sensor - Google Patents
Inductance type angular position sensor Download PDFInfo
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- CN112833923A CN112833923A CN202110216182.6A CN202110216182A CN112833923A CN 112833923 A CN112833923 A CN 112833923A CN 202110216182 A CN202110216182 A CN 202110216182A CN 112833923 A CN112833923 A CN 112833923A
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- Prior art keywords
- position sensor
- angular position
- coil
- induction
- capacitor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2073—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by movement of a single coil with respect to two or more coils
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention provides an inductive angular position sensor, wherein a stator is provided with a circular exciting coil and at least three induction coils positioned in the exciting coil, and a rotating axis of a rotor passes through the circle center of the exciting coil. The induction coils are distributed in a central symmetry mode by taking the circle center of the excitation coil as a center and are mutually independent, the induction coils are connected with the AD converter through the integral circuits where the induction coils are located, and the rotor is provided with a metal piece used for influencing the mutual inductance coefficient between the excitation coil and the induction coil. The angular position sensor provided by the invention has the advantages of simple structure and low cost.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an inductive angular position sensor.
Background
The conventional inductive angular position sensor generally needs to be provided with circuits such as amplification and comparison after an induction coil, which results in higher cost of the sensor, so how to provide an inductive angular position sensor with a simple structure and low cost becomes a technical problem to be solved urgently by a person skilled in the art.
Disclosure of Invention
In view of this, the present invention provides an inductive angular position sensor, which has the advantages of simple structure and low cost.
In order to achieve the purpose, the invention provides the following technical scheme:
an inductive angular position sensor comprising:
the stator is provided with a circular excitation coil and at least three induction coils positioned in the excitation coil, and the induction coils are centrosymmetrically distributed by taking the circle center of the excitation coil as the center and are mutually independent;
the rotation axis of the rotor passes through the circle center of the exciting coil, and the rotor is provided with a metal piece for influencing the mutual inductance coefficient between the exciting coil and the induction coil; and
and the induction coils are connected with the AD converter through the respective integral circuits.
Optionally, in the above inductive angular position sensor, both the exciting coil and the induction coil are PCB coils.
Optionally, in the above inductive angular position sensor, the induction coil has a fan shape.
Optionally, in the above inductive angular position sensor, the number of the induction coils is three, and the metal piece is a semicircular metal piece.
Optionally, in the above inductive angular position sensor, the integrating circuit where the induction coil is located includes a resistor, a transistor, and a capacitor, one end of the induction coil is connected to the base of the transistor through the resistor, the other end of the induction coil is connected to the emitter of the transistor, the collector of the transistor is connected to one end of the capacitor, the other end of the capacitor is grounded, and the input signal of the AD converter is the voltage at the two ends of the capacitor.
Optionally, in the above inductive angular position sensor, the common terminal of the induction coil and the transistor is grounded or connected to a power supply.
Optionally, in the above inductive angular position sensor, the integrating circuit in which the induction coil is located is formed by connecting the induction coil in series with a diode and a capacitor, and the input signal of the AD converter is a voltage across the capacitor.
According to the technical scheme, in the inductive angular position sensor provided by the invention, more than three induction coils are arranged in a circular excitation coil in a centrosymmetric manner by taking the circle center of the excitation coil as the center and are independent from each other, and the induction coils are connected with an AD converter through respective integral circuits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the position of a stator and a rotor of an inductive angular position sensor provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of the positions of the exciting coil and the induction coil of the inductive angular position sensor according to the embodiment of the present invention;
FIG. 3 is a functional block diagram of an inductive angular position sensor provided by an embodiment of the present invention;
FIGS. 4 and 5 are schematic diagrams of a first type of integrating circuit employed by an inductive angular position sensor provided by embodiments of the present invention;
FIGS. 6 and 7 are schematic diagrams of a second type of integration circuit employed by an inductive angular position sensor provided by embodiments of the present invention;
fig. 8 is a schematic diagram of the excitation coil and the induction coil printed on the PCB board.
Labeled as:
1. a stator; 11. an excitation coil; 12. an induction coil; 2. a rotor; 21. a metal piece.
Detailed Description
For the purpose of facilitating understanding, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, an inductive angular position sensor according to an embodiment of the present invention includes a stator 1 and a rotor 2, where the stator 1 is provided with a circular excitation coil 11 and three induction coils 12 located inside the excitation coil 11, and the induction coils 12 are distributed in a central symmetry manner with a center of a circle of the excitation coil 11 as a center and are independent of each other; the rotation axis of the rotor 2 passes through the center of the exciting coil 11, and the rotor 2 is provided with a metal member 21 for influencing the mutual inductance between the exciting coil 11 and the induction coil 12.
The functional block diagram of the inductive angular position sensor provided by the embodiment of the present invention is shown in fig. 3, the angular position sensor further includes integrating circuits corresponding to the induction coils 12 one to one, the induction coils 12 are connected to the AD converter through the respective integrating circuits, and the operating principle is as follows: the exciting coil 11 is excited by alternating signals to emit electromagnetic waves, induced currents are generated in the three induction coils 12, the magnitude of the induced currents is related to the mutual inductance coefficient between the exciting coil 11 and the induction coils 12, when the rotor 2 rotates, the metal piece 21 passes through the induction coils 12, the mutual inductance coefficient between the metal piece 21 and the exciting coil 11 changes, the induced currents change, the voltage at two ends of a capacitor in an integrating circuit changes due to the change of the induced currents, the single chip microcomputer reads the voltage change through an AD converter, and the position of the metal piece 21 can be judged through a preset operation program.
During operation, the AD values sampled by the three induction coils 12 periodically change along with the rotation of the rotor 2, the curve obtained by AD sampling is a sine wave, but the phase difference of the sine waves corresponding to the three induction coils 12 is 120 degrees, so that the specific position state of the rotor 2 can be obtained according to the magnitude relation of the AD values of the three induction coils 12. In designing the calculation program, the magnitude relationship of the AD value as the calculation result of the calculation program needs to have a one-to-one correspondence relationship with the target position state of the rotor 2. For example, after the sinusoidal signals corresponding to the three induction coils 12 are compared after the dc component is removed (in order to make the center point values of the three sinusoidal signals equal), for any one of the three induction coils 12, the corresponding AD value is greater than the AD values corresponding to the other two induction coils, and only appears in a certain 120 ° segment (i.e. one third of a circle) in the one-circle stroke of the rotor 2, so if "judge the induction coil corresponding to the largest of the current three AD values" is taken as the target of the calculation program, the calculation result has three cases, each of which corresponds to one third of the one-circle stroke of the rotor 2. Similarly, if "sorting the induction coils by the size of the current three AD values" is taken as a target of the calculation program, the calculation result has six cases, each of which corresponds to one sixth-cycle stroke of the rotor 2.
The difference between the above working principle and the traditional inductive angular position sensor is that the present invention does not have a hardware comparator to compare the voltages of the induction coils, but connects each induction coil with an AD converter through an integrating circuit, and directly uses software to calculate the position of the rotor according to the AD value, so that the angular position sensor has a simpler structure and lower cost.
As can be seen from fig. 1 and 2, in the present embodiment, the number of the induction coils 12 is three, the mutual distance is 120 °, and the metal piece 21 is a semicircular metal piece. In other embodiments, the induction coils 12 may have other magnitudes, for example, four induction coils 12 are arranged at 90 ° intervals. The induction coil 12 is usually designed as a sector, regardless of the number. Also, the exciting coil 11 and the induction coil 12 may be PCB coils, i.e. printed on a PCB board.
Referring to fig. 4 and 5, a first type of integration circuit adopted by the inductive angular position sensor according to the embodiment of the present invention includes a resistor, a transistor, and a capacitor, and since the structures of the integration circuits adopted by the three sense coils 12 are the same, taking one of the three sense coils as an example, one end of the sense coil L1 is connected to the base of the transistor Q1 through the resistor R1, the other end is connected to the emitter of the transistor Q1, the collector of the transistor Q1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is grounded, and an input signal of the AD converter is a voltage at two ends of the capacitor C1. Fig. 4 and 5 differ in that in fig. 4, the common terminal of the inductor and transistor is connected to the power supply, while in fig. 5, the common terminal of the inductor and transistor is grounded.
Referring to fig. 6 and 7, a second type of integrating circuit adopted by the inductive angular position sensor according to the embodiment of the present invention is formed by connecting an induction coil (for example, L1) in series with a diode D1 and a capacitor C1, where fig. 6 and 7 differ in that in fig. 6, a common terminal of the induction coil L1 and the capacitor C1 is connected to a power supply, while in fig. 7, a common terminal of the induction coil L1 and the capacitor C1 is grounded, and an input signal of an AD converter is a voltage at the other terminal of the capacitor C1.
No matter which type of integrating circuit is adopted, the PCB coil can be designed into the structure shown in fig. 8, each induction coil measures independently (i.e. the induction coils are independent and are not connected in series with each other), and the via hole at the center of the exciting coil is used for grounding or VCC as a reference point of the induced voltage.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An inductive angular position sensor, comprising:
the stator (1) is provided with a circular excitation coil (11) and at least three induction coils (12) positioned in the excitation coil (11), and the induction coils (12) are centrosymmetrically distributed by taking the circle center of the excitation coil (11) as the center and are mutually independent;
a rotor (2), the rotation axis of the rotor (2) passes through the center of the exciting coil (11), the rotor (2) is provided with a metal piece (21) for influencing the mutual inductance between the exciting coil (11) and the induction coil (12); and
and the induction coils (12) are connected with the AD converter through the integration circuits in which the induction coils (12) are respectively arranged.
2. Inductive angular position sensor according to claim 1, characterized in that the excitation coil (11) and the induction coil (12) are both PCB coils.
3. The inductive angular position sensor according to claim 2, characterized in that the induction coil (12) is fan-shaped.
4. The inductive angular position sensor according to claim 3, characterized in that the number of induction coils (12) is three and the metal piece (21) is a semicircular metal sheet.
5. The inductive angular position sensor according to any one of claims 1 to 4, characterized in that the integrating circuit in which the induction coil (12) is located comprises a resistor, a triode, and a capacitor, wherein one end of the induction coil (12) is connected to the base of the triode through the resistor, the other end of the induction coil is connected to the emitter of the triode, the collector of the triode is connected to one end of the capacitor, the other end of the capacitor is grounded, and the input signal of the AD converter is the voltage across the capacitor.
6. The inductive angular position sensor according to claim 6, characterized in that the induction coil (12) is connected to the common terminal of the transistor to ground or to a power supply.
7. The inductive angular position sensor according to any one of claims 1 to 4, characterized in that the integrating circuit in which the induction coil (12) is located is composed of the induction coil (12) in series with a diode and a capacitor, and the input signal of the AD converter is the voltage across the capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110216182.6A CN112833923A (en) | 2021-02-26 | 2021-02-26 | Inductance type angular position sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110216182.6A CN112833923A (en) | 2021-02-26 | 2021-02-26 | Inductance type angular position sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112833923A true CN112833923A (en) | 2021-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110216182.6A Withdrawn CN112833923A (en) | 2021-02-26 | 2021-02-26 | Inductance type angular position sensor |
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| Country | Link |
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| CN (1) | CN112833923A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899298A (en) * | 2021-10-15 | 2022-01-07 | 济南瑞泉电子有限公司 | Inductance position sensing device based on phase shift sine and cosine double-circuit voltage detection |
| CN113932705A (en) * | 2021-09-17 | 2022-01-14 | 深圳麦歌恩科技有限公司 | Self-excited coil induction angular position sensor and angular position detection method |
-
2021
- 2021-02-26 CN CN202110216182.6A patent/CN112833923A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932705A (en) * | 2021-09-17 | 2022-01-14 | 深圳麦歌恩科技有限公司 | Self-excited coil induction angular position sensor and angular position detection method |
| CN113932705B (en) * | 2021-09-17 | 2024-05-07 | 深圳麦歌恩科技有限公司 | Self-excitation type coil induction angular position sensor and angular position detection method |
| CN113899298A (en) * | 2021-10-15 | 2022-01-07 | 济南瑞泉电子有限公司 | Inductance position sensing device based on phase shift sine and cosine double-circuit voltage detection |
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Application publication date: 20210525 |
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