CN209877990U - Non-contact absolute angle position sensor of rotating body - Google Patents
Non-contact absolute angle position sensor of rotating body Download PDFInfo
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Abstract
The utility model belongs to the technical field of control and speed regulation of a switched reluctance motor, and discloses a non-contact absolute angle position sensor of a rotating body; a radial magnetized bipolar magnetic ring is sleeved on the rotary body, three Hall integrated circuits are placed in an arc shape at equal intervals or two Hall integrated circuits are placed in an arc shape at equal intervals and in an orthogonal mode, and the Hall integrated circuits are installed by using a mechanical device; the Hall integrated circuit is connected with the signal processing circuit. Under the condition that the rotating body rotates at a constant speed, the output voltage signals of the three linear Hall integrated circuits are sine waves with the same amplitude and frequency and different initial phases; the output voltage signal of the middle linear Hall integrated circuit is taken as a reference, and the initial phases of the output signals of the left and right linear Hall integrated circuits are related to the rotation direction of the rotator and are opposite numbers. The utility model has the advantages of simple structure, with low costs, the precision is high, the outage need not store, static or rotatory and can, the rotator just reverses and can.
Description
Technical Field
The utility model belongs to the technical field of switched reluctance motor's control and speed governing, especially, relate to an absolute angle position sensor of non-contact of rotator.
Background
Currently, the closest prior art: the speed regulating system of the switched reluctance motor is a latest generation stepless speed regulating system developed after a variable frequency speed regulating system and a brushless direct current motor speed regulating system, is a mechatronic high-tech technology integrating modern microelectronic technology, digital technology, power electronic technology, infrared photoelectric technology and modern electromagnetic theory, and is widely applied to the fields of household appliances, aviation, aerospace, electronics, machinery, electric vehicles and the like.
The speed regulating system of the switched reluctance motor generally comprises a motor body, a controller, a power converter, a current detection unit, an absolute angle position detector and the like. The switched reluctance motor generally has a constant torque area, a constant power area and a natural characteristic area, the on-off of the power supply of each pair of stator windings is accurately controlled no matter which area runs, and the on-off time of the power supply of a certain pair of stator windings depends on the absolute position of the rotor, so the absolute position detection of the rotor is a very key module of the speed regulating system of the switched reluctance motor. The absolute position detectors used for the rotor at present mainly include photoelectric type, resolver type, and electromagnetic type.
In the prior art, a switched reluctance motor absolute position detector for an electric vehicle and a control method thereof adopt a rotor disk which synchronously rotates with a motor and integrates a switching angle parameter and a rotor magnetic pole position, and two groove type high-precision photoelectric heads to detect the rotor absolute position, and belong to the photoelectric type. The defects are three points: the reliability is not high; the starting control of the motor is not facilitated; the conduction angle of a switched reluctance motor cannot be controlled in an electrical manner. After the rotor is allowed to wear for a while, mechanical abrasion may generate a powder layer, which may reduce the reliability of the photoelectric detection element. The method indicates the earliest opening angle and the maximum opening angle of a certain phase of magnetic poles, and does not directly output the absolute position angle of the rotor, so that the method is not beneficial to the starting control of the switched reluctance motor, because the position of the rotor is random when starting, and which phase is firstly electrified must be determined according to the specific position of the rotor. The speed regulation control of the switched reluctance motor can be realized by adopting input voltage PWM control of a stator and control of the size of a conduction angle, and the scheme can only adopt the input voltage PWM control and has insufficient control flexibility.
In the second prior art, a multi-periodic absolute position sensor (patent number: 102472642a) adopts a multi-pole magnetizing unit and two magnetic-sensitive detectors to realize the detection of the absolute position of a rotor, belongs to an electromagnetic type, relates to the position detection of more than dozens of degrees to several circles, needs to detect at least two components of a magnetic field by the first magnetic-sensitive detector, is mainly used on a steering column of an automobile, and cannot realize the detection of the absolute position of a rotating body at 0-360 degrees. The defects are as follows: absolute position detection of the rotating body by 0-360 ° cannot be achieved.
In the prior art, a magnetoelectric absolute position sensor with a large-center-aperture structure and a method for measuring an absolute position adopt a ring-shaped structure, an outer ring main code channel and an inner ring vernier code channel to realize the detection of the absolute position of a rotor, and belong to the electromagnetic type. Its drawbacks are two-fold: the precision is not high; not suitable for high speed motors. The main outer ring main track of the scheme is a 64-bit magnetic pole, the inner ring vernier track is a 63-magnetic pole, magnetic pole change information is detected, the number of the magnetic poles directly determines the precision of an output angle signal, and the increase of the number of the magnetic poles is limited by cost and installation space, so that the precision is not high. This scheme passes through SPI serial ports and host computer communication, explains that the AD is fast, and signal processing's time is longer, is not suitable for high-speed motor.
In the prior art, a non-contact passive-maintaining photomagnetic multi-turn absolute position sensor adopts a magnetic rotary encoder and a photoelectric encoder to realize the detection of the absolute position of a rotor, belongs to a photoelectric and electromagnetic type, and a powder layer can reduce the reliability of the photoelectric encoder. The defects are as follows: the rotation speed of the adaptive motor is not high. A core component of the scheme is a magnetic rotary encoder AS5045, which is a system on a chip integrating a Hall element, a CPU and the like, a rotary magnet is arranged right above a chip, the chip can output an absolute angle position signal, and one of input parameters is AS follows: the lowest resolution, i.e., 64 steps/revolution, 5.6 ° resolution, and a maximum speed of 9766rpm (revolutions per minute); the resolution is 0.087 DEG when the resolution is highest, namely 4096 steps/revolution, and the maximum rotation speed is 153 rpm. The maximum rotation speed cannot exceed 9766rpm even if the resolution is not required. The utility model discloses in, can adopt the ADC chip that resolution ratio is high, conversion rate is fast to high-speed motor's the condition, dispose fast-speed CPU, reasonable in design's algorithm realizes that resolution ratio is higher, the rotational speed is also very high absolute angle position output.
In summary, the problems of the prior art are as follows: the existing absolute position detector for the rotor has low reliability; absolute position detection of the rotating body by 0-360 ° cannot be realized; the system is relatively complex and the angular resolution is not high; the cost is high, the angular position is calculated by using the number and the sequence of the pulses, and the precision and the resolution are not high.
The difficulty of solving the technical problems is as follows:
the difficulty is mainly reflected in three aspects. Firstly, how to design a simple mechanical structure for placing the Hall sensor; secondly, selecting a proper A/D chip and a proper CPU (central processing unit), and ensuring that the output of the absolute angle position meets the requirements of resolution and rated rotating speed of the motor; and finally, designing a reasonable algorithm to improve the cost performance.
The significance of solving the technical problems is as follows:
a compact mechanical structure for placing the Hall sensor is the basis for the sensor to be reliable, high in cost performance and durable. The performance of the appropriate A/D chip and CPU is selected to directly affect the resolution and dynamic response time of the sensor output signal. The higher the a/D chip, the higher the resolution of the sensor output signal. The shorter the A/D chip conversion time is, the faster the CPU operation speed is, the shorter the dynamic response time of the sensor output signal is, and the higher the rated rotation speed of the motor can be. The reasonably designed algorithm is a good method for reducing the dynamic response time of the output signal of the sensor to the maximum extent under the condition of selecting an A/D chip and a CPU, and is the best method for improving the cost performance of the sensor.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists, the utility model provides a non-contact absolute angle position sensor of rotator.
The utility model discloses a realize like this, a non-contact absolute angle position sensor of rotator, non-contact absolute angle position sensor of rotator includes: the double-pole magnetic ring is coaxial with the rotating body or is relatively static, and comprises a linear Hall integrated circuit and a signal processing circuit board;
a radial magnetized bipolar magnetic ring is sleeved on the rotary body, three Hall integrated circuits are placed in an arc shape at equal intervals or two Hall integrated circuits are placed in an arc shape at equal intervals and in an orthogonal mode, and the Hall integrated circuits are installed by using a mechanical device; the Hall integrated circuit is connected with the signal processing circuit.
Further, under the condition that the rotating body rotates at a constant speed, the output voltage signals of the three linear Hall integrated circuits are sine waves with the same amplitude and frequency and different initial phases; the output voltage signal of the middle linear Hall integrated circuit is taken as a reference, and the initial phases of the output signals of the left and right linear Hall integrated circuits are related to the rotation direction of the rotator and are opposite numbers.
Further, the signal processing circuit board comprises an ADC, a CPU and a communication interface;
ADC, three or two inputs, resolution determines the accuracy of absolute angle position;
the CPU completes initialization, interrupt control, calculation, storage and output of the ADC;
and the communication interface is used for finishing the output of the absolute angle position digital signal, can be a serial port output or a parallel port output, and uses a parallel port mode when the adoption rate of the ADC is very high.
Further, the placement positions of the linear hall ics may be two equidistant and orthogonal placements shown in fig. 6, in addition to the three equidistant and arc shapes shown in fig. 1.
Another object of the present invention is to provide a switched reluctance motor using the non-contact absolute angular position sensor of the rotating body.
Another object of the present invention is to provide a motor using the non-contact absolute angular position sensor of the rotating body for detecting the absolute angular position of the rotating body.
Another object of the present invention is to provide a device for detecting an absolute angular position of a rotating body using the non-contact absolute angular position sensor of the rotating body.
To sum up, the utility model discloses an advantage and positive effect do: the utility model has the advantages of simple structure, with low costs, the precision is high, the outage need not store, static or rotatory and can, the rotator just reverses and can.
In the prior art, a switched reluctance motor absolute position detector for an electric vehicle and a control method thereof adopt a rotor disk which synchronously rotates with a motor and integrates a switching angle parameter and a rotor magnetic pole position, and two groove type high-precision photoelectric heads to detect the rotor absolute position, and belong to the photoelectric type. Compared with the utility model, its defect has three points: the reliability is not high; the starting control of the motor is not facilitated; the conduction angle of a switched reluctance motor cannot be controlled in an electrical manner. After the rotor is allowed to wear for a while, mechanical abrasion may generate a powder layer, which may reduce the reliability of the photoelectric detection element. The method indicates the earliest opening angle and the maximum opening angle of a certain phase of magnetic poles, and does not directly output the absolute position angle of the rotor, so that the method is not beneficial to the starting control of the switched reluctance motor, because the position of the rotor is random when starting, and which phase is firstly electrified must be determined according to the specific position of the rotor. The speed regulation control of the switched reluctance motor can be realized by adopting input voltage PWM control of a stator and control of the size of a conduction angle, and the scheme can only adopt the input voltage PWM control and has insufficient control flexibility. The utility model discloses the reliability is very high, as long as it is not the layering very thick (this kind of condition can not take place in switched reluctance motor's life-span), linear hall element can both normally work, just can arouse signal amplitude to descend to some extent, because signal processing circuit will be the normalization processing, does not influence the absolute position angle that exports yet correctly. No matter be static or under the motion state, the utility model discloses the output is the absolute position angle of rotor, so starting control when static is very convenient and accurate, can adopt the input voltage PWM control of stator or the control of conduction angle size to realize switched reluctance motor's speed governing moreover, and is nimble various.
In the second prior art, a multi-periodic absolute position sensor (patent number: 102472642a) adopts a multi-pole magnetizing unit and two magnetic-sensitive detectors to realize the detection of the absolute position of a rotor, belongs to an electromagnetic type, relates to the position detection of more than dozens of degrees to several circles, needs to detect at least two components of a magnetic field by the first magnetic-sensitive detector, is mainly used on a steering column of an automobile, and cannot realize the detection of the absolute position of a rotating body at 0-360 degrees. Compared with the utility model, its defect has a bit: absolute position detection of the rotating body by 0-360 ° cannot be achieved. The utility model can output the absolute position of 0-360 degrees of the rotator.
In the prior art, a magnetoelectric absolute position sensor with a large-center-aperture structure and a method for measuring an absolute position adopt a ring-shaped structure, an outer ring main code channel and an inner ring vernier code channel to realize the detection of the absolute position of a rotor, and belong to the electromagnetic type. Compared with the utility model, its defect has two points: the precision is not high; not suitable for high speed motors. The main outer ring main track of the scheme is a 64-bit magnetic pole, the inner ring vernier track is a 63-magnetic pole, magnetic pole change information is detected, the number of the magnetic poles directly determines the precision of an output angle signal, and the increase of the number of the magnetic poles is limited by cost and installation space, so that the precision is not high. This scheme passes through SPI serial ports and host computer communication, explains that the AD is fast, and signal processing's time is longer, is not suitable for high-speed motor. The utility model discloses in, only need a bipolar magnetic ring, the precision of the absolute angle position of output depends on AD's precision, and it is very easy thing that AD's precision reaches 12bits or 16 bits. The utility model discloses a AD of high accuracy utilizes the interrupt mode and the host computer communication of parallel port, both is fit for the low-speed motor, is fit for the high-speed motor again.
In the prior art, a non-contact passive-maintaining photomagnetic multi-turn absolute position sensor adopts a magnetic rotary encoder and a photoelectric encoder to realize the detection of the absolute position of a rotor, belongs to a photoelectric and electromagnetic type, and a powder layer can reduce the reliability of the photoelectric encoder. Compared with the utility model, its defect has a bit: the rotation speed of the adaptive motor is not high. A core component of the scheme is a magnetic rotary encoder AS5045, which is a system on a chip integrating a Hall element, a CPU and the like, a rotary magnet is arranged right above a chip, the chip can output an absolute angle position signal, and one of input parameters is AS follows: the lowest resolution, i.e., 64 steps/revolution, 5.6 ° resolution, and a maximum speed of 9766rpm (revolutions per minute); the resolution is 0.087 DEG when the resolution is highest, namely 4096 steps/revolution, and the maximum rotation speed is 153 rpm. The maximum rotation speed cannot exceed 9766rpm even if the resolution is not required. The utility model discloses in, can adopt the ADC chip that resolution ratio is high, conversion rate is fast to high-speed motor's the condition, dispose fast-speed CPU, reasonable in design's algorithm realizes that resolution ratio is higher, the rotational speed is also very high absolute angle position output. In one embodiment of the utility model, MSP430 single chip microcomputer is used as A/D conversion and CPU and parallel interrupt mode output, when the resolution is 0.087 degree, the maximum rotation speed is 3000 rpm; the resolution was 1 ° and the maximum rotation speed was 21000 rpm.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact absolute angular position sensor of a rotating body according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal processing circuit board structure according to an embodiment of the present invention;
in the figure: 1. a bipolar magnetic ring; 2. a linear Hall integrated circuit; 3. and a signal processing circuit board.
Fig. 3 is a flowchart illustrating a method for using a non-contact absolute angular position sensor of a rotating body according to an embodiment of the present invention.
Fig. 4 is an algorithm schematic diagram of the CPU that three hall ics equidistant arc placed provided by the embodiment of the present invention calculate the absolute angle position.
Fig. 5 is a time domain waveform diagram of the absolute angular position θ output when the rotating body rotates at a constant speed according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of two equidistant and orthogonal placing linear hall ics provided by the embodiment of the present invention.
Fig. 7 is an algorithm schematic diagram of two hall ics equally spaced and orthogonally arranged CPUs for calculating absolute angle positions according to the embodiment of the present invention.
Fig. 8 is a rotor coordinate system x of the switched reluctance motor according to an embodiment of the present invention2Oy2Orthogonal coordinate system x with stator1Oy1Schematic diagram of the relationship of (1).
Fig. 9 is a schematic diagram of a position relationship between a magnetic ring and two coordinate systems according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The reliability of the existing absolute position detector for the rotor is not high; absolute position detection of the rotating body by 0-360 ° cannot be realized; the system is relatively complex and the angular resolution is not high; high cost, and low precision and resolution by utilizing the number and the sequence of the pulses to calculate the angle position. The utility model has the advantages of simple structure, with low costs, the precision is high, the outage need not store, static or rotatory and can, the rotator just reverses and can.
The following description is made in detail for the application of the principles of the present invention with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a non-contact absolute angle position sensor of a rotating body, including: the magnetic circuit comprises a bipolar magnetic ring 1 coaxial with the rotating body or relatively static, a linear Hall integrated circuit 2 and a signal processing circuit board 3.
The output voltage signals of the three linear Hall integrated circuits 2 are in direct proportion to the magnetic flux density on the surfaces of the three linear Hall integrated circuits 2, and the output signals of the linear Hall integrated circuits 2 are used as the only 0- (360-theta)p) Real-time data of absolute angular position, wherein θpIs the resolution angle of the absolute angular position. Under the condition that the rotator rotates at a constant speed, the output voltage signals of the three linear hall integrated circuits 2 are sine waves with the same amplitude and frequency and different initial phases. The output voltage signal of the middle linear Hall integrated circuit is taken as a reference, the initial phase of the output signals of the left and right linear Hall integrated circuits is related to the rotation direction (forward direction, reverse direction or clockwise direction and counterclockwise direction) of the rotator, and the initial phase is opposite to the initial phase.
The signal processing circuit board 3 generally includes an ADC, a CPU, and a communication interface, as shown in fig. 2. The ADC is a three-way input whose resolution determines the accuracy of the absolute angular position; the CPU completes the functions of initialization, interrupt control, calculation, storage and the like of the ADC; the communication interface completes the output of the absolute angle position digital signal, and can be a serial port output or a parallel port output, and when the rotating speed of the rotating body is high, only a parallel port mode can be used.
The algorithm for the CPU to calculate the absolute angular position θ is shown in fig. 4. For the case of symmetrical arrangement of three hall ics as depicted in fig. 1, the algorithm for calculating the absolute angular position θ by the CPU proceeds as follows: step 1, for the B path signal SB(t) normalizing to sb(t) of (d). Step 2, judging sb(t) is equal to 0. Step 3, at sbIf S is 0C(t) is greater than SA(t), directly giving an absolute position angle θ of 0 °; otherwise, θ is 180 °, and the calculation is finished. Step 4, at sb(t) is greater than 0, if SC(t) is greater than SA(t) absolute position angle θ is arcsin [ s ]b(t)](ii) a On the contrary, theta is 180-arcsin [ s ]b(t)]And the calculation is finished. Step 5, at sb(t) is less than 0, if SC(t) is greater than SA(t) an absolute position angle θ of 360 ° + arcsin [ s ]b(t)](ii) a On the contrary, theta is 180 DEG-arcsin[sb(t)]And the calculation is finished.
For the case of two equally spaced, orthogonally disposed linear hall ics as depicted in fig. 6, the algorithm for the CPU to calculate the absolute angular position θ proceeds as follows: step 1, two paths of signals SA(t) and SB(t) normalization to sa(t) and sb(t) of (d). Step 2, judging sa(t) is equal to 0. Step 3, at saIf s is 0b(t) is equal to 1, giving directly an absolute position angle θ of 0 °; otherwise, θ is 180 °, and the calculation is finished. Step 4, at sa(t) is greater than 0, if sb(t) is greater than 0 and the absolute position angle θ is arcsin [ s ]a(t)](ii) a On the contrary, theta is 180-arcsin [ s ]a(t)]And the calculation is finished. Step 5, at sa(t) is less than 0, if sb(t) is greater than 0 and the absolute position angle θ is 360 ° + arcsin [ s ]a(t)](ii) a On the contrary, theta is 180-arcsin [ s ]a(t)]And the calculation is finished.
According to this algorithm, a unique absolute angular position is output whether the rotator is stationary or rotating. When the rotating body rotates at a constant speed, the time domain waveform of the absolute angular position θ is output as shown in fig. 5.
As for the placement position of the linear hall ics 2, in addition to the three equally spaced, arc-shaped shapes shown, two equally spaced, orthogonal placements may also be used, as shown in fig. 6. The algorithm for the CPU to calculate the absolute angular position θ is shown in fig. 7.
As shown in fig. 3, an embodiment of the present invention provides a method for using a non-contact absolute angular position sensor of a rotating body, including the following steps:
s301: a radial magnetized bipolar magnetic ring is sleeved on the rotary body, and an absolute angle can be led out through a mechanical transmission device, so that the angular position of the magnetic ring is ensured to be the angular position of the rotary body;
s302: the Hall integrated circuits are installed by a mechanical device in a mode of arc-shaped arrangement of three Hall integrated circuits at equal intervals or arrangement of two Hall integrated circuits at equal intervals and in an orthogonal mode;
s303: the Hall integrated circuit is connected with the signal processing circuit, the CPU of the signal processing circuit calculates the absolute angle position of the rotating body, and the absolute angle position of the rotating body is output through the communication interface.
No matter the rotating body is static or rotating, the magnetic ring is static relative to the rotating body, and the magnetic ring adopts a bipolar permanent magnet and is magnetized in the radial direction. The left magnetic ring, the right magnetic ring, the middle magnetic ring and the magnetic ring are symmetrically distributed, the left magnetic ring, the right magnetic ring and the middle magnetic ring are at equal spacing distances, the spacing distances are related to the magnetic induction intensity of the magnetic rings, if the spacing distances are too close, magnetic saturation is generated, if the spacing distances are too far, output signals are too small, and the signal-to-noise ratio is low.
In FIG. 1, if Hall IC B outputs a voltage signal of
SB(t)＝Umsin(ωt) (1)
The Hall integrated circuits A and C output voltage signals respectively of
SA(t)＝Umsin(ωt+θ0) (2)
SC(t)＝Umsin(ωt-θ0) (3)
Wherein, theta0The initial phase of the output voltage signals of the Hall integrated circuits A and C; omega is the angular frequency of the output voltage signals of the three linear Hall integrated circuits and is also the rotation angular frequency of the rotator; u shapemIs the amplitude of the output voltage signal of the three linear hall ics.
The application of the principles of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, firstly, a radially magnetized bipolar magnetic ring is sleeved on the rotating body, the geometric center of the magnetic ring can be the geometric center of the rotating body, and an absolute angle can also be led out through a mechanical transmission device, and both the two ways are to ensure that the magnetic ring is stationary relative to the rotating body, that is, the angular position of the magnetic ring is the angular position of the rotating body. As shown in fig. 1 and 6, the hall ics may be installed by using a mechanical device in a manner that three hall ics are placed in an arc shape at equal intervals or two hall ics are placed in an arc shape at equal intervals and in an orthogonal manner. Finally, as shown in fig. 2, the hall ic is connected to the signal processing circuit, and the CPU of the signal processing circuit calculates the absolute angular position of the rotating body and outputs the absolute angular position of the rotating body through the communication interface.
The utility model discloses a sensor involves the demarcation of 0 angle. The calibration of the 0-degree angle will now be described by taking a switched reluctance motor as an example, as shown in fig. 8. Rectangular coordinate system x of stator1Oy1Rectangular coordinate system of rotor is x2Oy2And p (x, y) is a point on the rotor with a polar angle β. When the two coordinate systems coincide, the angle-dependent position of the rotor is 0. The absolute angular position of the sensor output is the coordinate system x2Oy2In a clockwise rotation by an angle theta. When the rotor is rotating, point p on the rotor is at x for a rectangular coordinate system1Oy1The polar angle in (1) is beta-theta.
The front side of the linear Hall integrated circuit is over against the magnetic ring, and when the center of the N pole of the magnetic ring rotates to the geometric center of the Hall integrated circuit, the output signal of the Hall integrated circuit is maximum; when the center of the S pole of the magnetic ring rotates to the geometric center of the Hall integrated circuit, the output signal of the Hall integrated circuit is minimum; when the junction point of the N pole and the S pole of the magnetic ring rotates to the geometric center of the Hall integrated circuit, the output signal of the Hall integrated circuit is a middle value, namely half of the sum of the maximum value and the minimum value. When computing the block angular position, we use an arcsine function. Therefore, the position relationship between the magnetic ring and the two coordinate systems is shown in fig. 9. The magnet ring is mounted according to fig. 9, the angle calculated according to fig. 3 or 7 being the rotor in the stator coordinate system x1Oy1Absolute angular position of (1).
The following describes the application of the present invention in detail with reference to the accompanying drawings.
Taking fig. 1 as an example, an experimental scene diagram shows signal waveforms output by three hall ics. A set of measured experimental data is shown in table 1, wherein real data is directly read by a dial, the measured data is uploaded to an upper PC through a serial port, and the serial port is debugged and displayed.
TABLE 1 set of measured Experimental data
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A noncontact absolute angle position sensor of a rotating body, characterized by comprising: the double-pole magnetic ring is coaxial with the rotating body or is relatively static, and comprises a linear Hall integrated circuit and a signal processing circuit board;
a radial magnetized bipolar magnetic ring is sleeved on the rotary body, three Hall integrated circuits are placed in an arc shape at equal intervals or two Hall integrated circuits are placed in an arc shape at equal intervals and in an orthogonal mode, and the Hall integrated circuits are installed by using a mechanical device; the Hall integrated circuit is connected with the signal processing circuit.
2. The non-contact absolute angle position sensor of a rotating body according to claim 1, wherein the three linear hall ics output voltage signals are sine waves having the same amplitude and frequency and different initial phases under the condition that the rotating body rotates at a constant speed; the output voltage signal of the middle linear Hall integrated circuit is taken as a reference, and the initial phases of the output signals of the left and right linear Hall integrated circuits are related to the rotation direction of the rotator and are opposite numbers.
3. The rotary absolute noncontact angle position sensor according to claim 1, wherein said signal processing circuit board includes an ADC, a CPU, a communication interface;
ADC, three or two inputs, resolution determines the accuracy of absolute angle position;
the CPU completes initialization, interrupt control, calculation, storage and output of the ADC;
and the communication interface is used for finishing the output of the absolute angle position digital signal, can be a serial port output or a parallel port output, and uses a parallel port mode when the adoption rate of the ADC is very high.
4. The rotary body absolute non-contact angle position sensor according to claim 1, wherein the linear hall ics are disposed in two equally spaced, orthogonal orientations in addition to three equally spaced, arcuate orientations.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044388A (en) * | 2019-04-23 | 2019-07-23 | 刘法锐 | A kind of contactless absolute angular position sensor and application method of rotary body |
| CN112327213A (en) * | 2020-10-19 | 2021-02-05 | 南京工程学院 | Electric revolving body performance detection system and detection method |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044388A (en) * | 2019-04-23 | 2019-07-23 | 刘法锐 | A kind of contactless absolute angular position sensor and application method of rotary body |
| CN112327213A (en) * | 2020-10-19 | 2021-02-05 | 南京工程学院 | Electric revolving body performance detection system and detection method |
| CN112327213B (en) * | 2020-10-19 | 2024-04-19 | 南京工程学院 | Electric revolving body performance detection system and detection method |
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