Non-contact electromagnetic structure for high-precision linear output of voltage in 80-degree rotation angle range

Abstract

The invention discloses a non-contact electromagnetic structure for high-precision linear output of voltage in a rotation angle range of 80 degrees, and the structure is characterized in that the structure comprises a stator and a rotor which are coaxially arranged, the stator is located at the outer side of the rotor, and an air gap is formed between the stator and the rotor; the stator is of a four-tooth four-groove structure, four C-shaped grooves are formed in the stator at intervals, and four T-shaped teeth are arranged among the four C-shaped grooves; the rotor is of a double-salient-pole structure, and marking grooves are formed in the stator and the rotor respectively. In the structure, the stator and the rotor are coaxial and are arranged on the outer side of the rotor, and the rotor is not in contact with the stator. The structure is free of electronic components and optical devices, can tolerate extremely wide high and low temperature ranges and high vibration and impact use scenes, and is long in service life and high in reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of angle sensors, and in particular relates to a non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range. Background Art

[0002] Limited-angle rotary mechanical systems are commonly used for angle position detection within a specific angle range. They are the key to precise control of motion and position, especially in certain limited-angle rotary mechanical systems such as valves, actuators, and robot joints, which have higher requirements for angle detection accuracy and reliability.

[0003] In the prior art, limited angle detection is mostly achieved using photoelectric encoders or magnetoelectric encoders. However, photoelectric encoders are sensitive to humid gases and polluted environments, and their output signals are easily interfered with. They are not tolerant to scenarios with large vibrations and impacts. Magnetoelectric encoders have a high failure rate due to electronic components and chips, and are easily affected by high and low temperatures, resulting in inaccurate detection angles.

[0004] In summary, there is an urgent need for an angle measurement structure with high reliability. Summary of the invention

[0005] The purpose of the present invention is to provide a non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range, so as to solve the problems in the prior art.

[0006] The present invention is achieved through the following technical scheme: a non-contact electromagnetic structure with high-precision linear output of voltage in an 80° rotation angle range, characterized in that: it includes a coaxially arranged stator and rotor, the stator is located on the outside of the rotor and an air gap is provided between the stator and the rotor; the stator is a four-tooth four-slot structure, four C-shaped slots are arranged at intervals on the stator, and four T-shaped teeth are arranged between the four C-shaped slots; the rotor is a double salient pole structure, and marking slots are respectively provided on the stator and the rotor.

[0007] Further: the rotor is a 90° double-salient pole structure.

[0008] Furthermore: the slot width of the C-shaped slot is 0.57 mm; the inner diameter of the stator is 7 mm; and the outer diameter of the rotor is 6.9 mm.

[0009] Furthermore: the stator is formed by rotating and stacking 0.2mm magnetic conductive alloy sheets; the rotor is formed by stacking 0.2mm magnetic conductive alloy sheets in a fixed direction.

[0010] Further: when the rotor center axis is vertical, the relative position of the rotor and the stator is the electrical zero position of the structure, and the output voltage of the structure is no more than 15mV; when the angle between the rotor center axis and the vertical line is ±40°, the relative position of the rotor and the stator is the electrical end point position of the structure, and the output voltage of the structure is 15V±0.15V.

[0011] The advantages of the present invention are: in the structure described in the present invention, the stator and the rotor are coaxial and on the outside of the rotor, and the rotor and the stator are non-contacting. There are marking grooves on the stator and rotor structure, and the rotor marking grooves are used to determine the optimal and consistent magnetic conductivity direction. The stator is rotated and stacked according to the marking grooves to ensure the uniformity of magnetic conductivity in each angular direction, thereby ensuring the linear relationship between the output voltage and the corresponding angle. Since this structure has no electronic components and optical devices, it can withstand an extremely wide range of high and low temperatures and very high vibration and impact usage scenarios, and has a long service life and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the electrical schematic diagram of the present invention; Figure 2 It is a schematic diagram of the rotor-stator matching structure of the present invention; Figure 3 Schematic diagram of the rotor structure and dimensions in an embodiment of the present invention; Figure 4 Schematic diagram of the stator structure and dimensions in an embodiment of the present invention; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0013] Explanation of the serial numbers in the figure: 1 is the stator, 2 is the rotor, 3 is the C-shaped slot, 4 is the T-shaped tooth, 5 is the salient pole, and 6 is the marking slot. DETAILED DESCRIPTION

[0014] Reference Figure 1-5 The present invention discloses a non-contact electromagnetic structure with high-precision linear output of voltage in an 80° rotation angle range, comprising a coaxially arranged stator 1 and a rotor 2, wherein the stator is located outside the rotor and an air gap is provided between the stator and the rotor (the mechanical connection between the stator and the rotor and the outside is a prior art and will not be described in detail); the stator is a four-tooth four-slot structure, four C-shaped slots 3 are arranged at intervals on the stator, and four T-shaped teeth 4 are arranged between the four C-shaped slots; the rotor is a double salient pole structure, two salient poles 5 are symmetrically arranged, and a marking slot 6 is provided at the asymmetric line position on the stator and the rotor respectively.

[0015] Preferably, two 90° salient pole structures are symmetrically arranged on the rotor, and the salient pole is in a quarter-circular ring shape.

[0016] Preferably, the width of the C-shaped slot is 0.57 mm; the inner diameter of the stator is 7 mm; and the outer diameter of the rotor is 6.9 mm.

[0017] Preferably, the stator is formed by rotating and stacking 0.2 mm magnetic conductive alloy sheets; the rotor is formed by stacking 0.2 mm magnetic conductive alloy sheets in a fixed direction.

[0018] Preferably: when the rotor center axis is vertical, the relative position of the rotor and the stator is the electrical zero position of the structure, and the output voltage of the structure is not greater than 15mV; when the angle between the rotor center axis and the vertical line is ±40°, the relative position of the rotor and the stator is the electrical end position of the structure, and the output voltage of the structure is 15V±0.15V.

[0019] The working principle of the present invention is as follows.

[0020] like Figure 1 As shown: AC voltage U is applied to winding S1S2 12 , current flows in, thus exciting an alternating magnetic flux in the stator, air gap, and rotor. φ , as the rotor rotation angle changes, the magnetic flux φ The magnetic flux of the winding S3S4 phase turns also changes accordingly, and a voltage U is induced in the winding S3S4 that changes linearly with the rotor angle. 34 On the contrary, according to the voltage U 34 The rotation angle can be obtained.

[0021] The present invention is further described below through specific embodiments.

[0022] Embodiment 1: A non-contact electromagnetic structure with high-precision linear output of voltage in an 80° rotation angle range, the structure comprising: a stator and a rotor, the stator and the rotor are coaxial and on the outside of the rotor, and there is an air gap between the rotor and the stator. In this embodiment, the stator is a four-tooth four-slot structure, which is formed by rotating and stacking 0.2mm magnetic conductive alloy sheets, the C-shaped slot has a notch width of 0.57mm and an inner diameter of 7mm; Figure 5As shown in the figure, the C-shaped slot is enclosed by the notch and the curve on the left, the curves on the upper and lower sides, and the straight lines on both sides of the notch, and the connections are tangent. Among them, the curve on the left is part of the rotor concentric circle with a diameter of 15.05, and the upper and lower curves are arcs with a radius of 1.7. The centers of the two arcs are on the rotor concentric circle with a diameter of 11.65 and the distance between the two centers is 2.50. In this embodiment, the rotor is a 90° double salient pole structure, which is composed of 0.2mm magnetic conductive alloy sheets stacked in a fixed direction, with an outer diameter of 6.9mm, an inner hole diameter of 2.2, and a non-salient pole part diameter of 5.1. When the rotor is in a vertical state (when the diameter passing through the center of the two salient poles is in a vertical state), the relative position of the rotor and the stator is the electrical zero position of the structure, and the output voltage of the structure is not greater than 15mV. Based on this, the clockwise output voltage is defined as negative, the counterclockwise output voltage is defined as positive, the output voltage amplitude is determined by the number of stator coil turns and the magnetic permeability of the stator and rotor materials, and the output voltage accuracy is determined by the specific structural dimensions, materials, heat treatment, and assembly methods of the stator and rotor. In order to ensure the stability of the output voltage at each angle, in this solution, marking grooves are provided on the stator and rotor structures respectively. The rotor marking grooves can ensure the optimal and consistent magnetic conductivity direction. The stator is rotated and stacked according to the marking grooves to ensure the uniformity of magnetic conductivity at each angle, thereby ensuring the linear relationship between the output voltage and the corresponding angle. Figure 5 As shown, the relative position of the rotor and the stator is +40° (the reverse symmetrical position is -40°) of the structure, and the output voltage of the structure is 15V±0.15V. The voltage output every 4° from the electrical zero position to ±40° is calculated using the least squares method to obtain the linearity of the output voltage. This embodiment can effectively achieve high-precision linear output of voltage in the 80° rotation angle range, and then the precise angle of the rotor can be obtained based on the voltage, thereby achieving angle measurement.

Claims

1. A non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range, characterized in that: It comprises a coaxially arranged stator and rotor, wherein the stator is located outside the rotor and an air gap is provided between the stator and the rotor; The stator has a four-tooth four-slot structure, with four C-shaped slots arranged at intervals on the stator, and four T-shaped teeth between the four C-shaped slots; The rotor is a double-salient-pole structure, and marking grooves are respectively arranged on the stator and the rotor.

2. According to claim 1, a non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range, characterized in that: The rotor is a 90° double-salient pole structure.

3. The non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range according to claim 1, characterized in that: The width of the C-shaped slot is 0.57 mm; the inner diameter of the stator is 7 mm; and the outer diameter of the rotor is 6.9 mm.

4. The non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range according to claim 1, characterized in that: The stator is formed by rotating and stacking 0.2 mm magnetic conductive alloy sheets; the rotor is formed by stacking 0.2 mm magnetic conductive alloy sheets in a fixed direction.

5. The non-contact electromagnetic structure with high-precision linear output of voltage within an 80° rotation angle range according to claim 1, characterized in that: When the rotor center axis is vertical, the relative position of the rotor and the stator is the electrical zero position of the structure, and the output voltage of the structure is no more than 15mV; when the angle between the rotor center axis and the vertical line is ±40°, the relative position of the rotor and the stator is the electrical end position of the structure, and the output voltage of the structure is 15V±0.15V.

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