Electromagnetic rotating speed phase difference sensing device

Abstract

The utility model discloses an electromagnetic rotating speed phase difference sensing device. Comprising a mounting shell, a torsion shaft rotationally arranged on the mounting shell, two outer tooth circular rings which are arranged in the mounting shell and oppositely arranged at the two opposite ends of the torsion shaft, and two electromagnetic sensing assemblies which are arranged in the mounting shell and are arranged in one-to-one correspondence with the outer tooth circular rings, the electromagnetic sensing assembly comprises an inner gear ring part arranged outside the outer gear ring in a surrounding mode, a sensing coil arranged in the inner gear ring part and used for being connected with a power source to generate a magnetic field, and a cover disc arranged in the installation shell, arranged outside the outer gear ring in a sleeving mode and used for abutting against the sensing coil to fix the sensing coil in the inner gear ring part. According to the scheme, through cooperation of the installation shell, the torsion shaft, the outer tooth circular ring and the electromagnetic sensing assembly, torque measurement is achieved, and compared with the prior art, the torque sensor is high in applicability, high in measurement precision and sensitivity, high in practicability and suitable for wide application and popularization.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular, to an electromagnetic speed phase difference sensing device. Background Technology

[0002] The electromagnetic speed phase difference sensor is a non-contact torque measurement device based on the principles of electromagnetic induction and phase difference. Its core function is to calculate the torque value by detecting the phase change of a rotating shaft under torque. It enables non-contact measurement and features high precision, high reliability, and long lifespan, making it widely used in industrial, automotive, and aerospace fields requiring dynamic torque monitoring. Its core value lies in providing real-time feedback on the load status of mechanical systems, offering crucial data support for performance optimization and fault prevention.

[0003] Currently, Chinese utility model patent CN205562092U discloses a magnetoelectric phase difference torque sensor, including a foundation base, a housing, an elastic shaft, an external gear, a permanent magnet, a sleeve bearing, a V-belt, a rigid coupling, a drive motor, a housing cover, an internal gear, an induction coil, an intermediate sleeve, an end cover, and a bearing pressure rod. The housing is mounted on the upper side of the sensor foundation base. An elastic shaft is mounted on the upper side of the housing. An external gear is mounted on the upper right side of the elastic shaft. A pair of permanent magnets is mounted on the upper side of the external gear. An end cover is mounted on the outer side of the permanent magnets. A bearing pressure cover is mounted on the outer side of the end cover. An internal gear is mounted on the upper side of the external gear. An induction coil is positioned between the internal and external gears. An intermediate sleeve is mounted on the upper side of the internal gear. A sleeve bearing is mounted on the upper side of the intermediate sleeve. The housing cover is mounted on the upper side of the sleeve bearing. This magnetoelectric phase difference torque sensor has advantages such as high measurement accuracy, intuitive readings, and convenient automatic recording.

[0004] However, in the actual measurement process of the above sensors, the magnetic field strength depends on the permanent magnet. The magnetic force of the permanent magnet is relatively fixed, that is, the magnetic field strength is relatively fixed. It cannot be adaptively adjusted according to the differences in the measured parts and materials, resulting in poor applicability and potentially low measurement accuracy. Utility Model Content

[0005] This invention provides an electromagnetic speed phase difference sensing device to solve the technical problems of poor applicability and low measurement accuracy of existing measurement sensing devices.

[0006] According to one aspect of the present invention, an electromagnetic speed phase difference sensing device is provided, comprising a mounting housing, a torsion shaft rotatably disposed on the mounting housing, two external toothed rings disposed within the mounting housing and disposed opposite to each other at opposite ends of the torsion shaft, and two electromagnetic sensing components disposed within the mounting housing and corresponding to the external toothed rings. The electromagnetic sensing components include an inner toothed ring portion surrounding the external toothed rings, a sensing coil disposed within the inner toothed ring portion for connecting to a power source to generate a magnetic field, and a cover plate disposed within the mounting housing and sleeved on the external toothed rings for pressing against the sensing coils to fix the sensing coils within the inner toothed ring portions.

[0007] As a further improvement to the above technical solution:

[0008] Furthermore, the outer toothed ring has an annular surface and an outer toothed ring surface at its two axial ends, respectively, and the cover plate is fitted onto the annular surface, with the outer toothed ring surface facing the inner toothed ring portion.

[0009] Furthermore, the internal toothed ring is arranged in a central cylindrical shape, with one axial end of the internal toothed ring abutting against the cover plate, and the inner wall surface of the other axial end being an internal toothed ring surface arranged corresponding to the external toothed ring surface.

[0010] Furthermore, the tooth profile and number of teeth are the same on the internal and external tooth ring surfaces.

[0011] Furthermore, the number of teeth on the internal gear ring ranges from 110 to 130.

[0012] Furthermore, the radial outer wall surface of the internal gear ring and the radial inner wall surface of the mounting housing are fitted together.

[0013] Furthermore, the mounting housing has a limiting protrusion for axially limiting the internal toothed ring portion.

[0014] Furthermore, the sensing coil is wound in a clockwise direction.

[0015] Furthermore, the torsion axis is an elastic axis arranged symmetrically on both sides.

[0016] Furthermore, the mounting housing is arranged in a hollow cylindrical shape, and mounting grooves are respectively opened at both ends of the mounting housing, and bearings for supporting the torsion shaft are arranged in the mounting grooves.

[0017] This utility model has the following beneficial effects:

[0018] This invention relates to an electromagnetic speed phase difference sensing device. A torsion shaft is mounted on a housing, with two external toothed rings positioned at both axial ends of the shaft. Two electromagnetic sensing components are housed within the housing, arranged in a one-to-one correspondence with the external toothed rings. Each electromagnetic sensing component is encircled by an internal toothed ring around the external toothed ring. A cover plate, fitted over the external toothed ring, presses against the sensing coil, fixing it within the internal toothed ring. The sensing coil is then connected to a power source. The internal toothed ring, sensing coil, cover plate, and external toothed rings form a closed magnetic circuit. According to measurement requirements, a direct current of the same direction and magnitude can be supplied to both sensing coils via a power source, generating a magnetic field with the required strength in the closed magnetic circuit. This improves adaptability and measurement accuracy. When the torsion shaft rotates... Two electromagnetic sensing components output a rotational speed phase difference signal, which is then measured by a corresponding instrument. During the measurement process, there is no magnetic saturation in the closed magnetic circuit, and the air gap magnetic resistance between the cover plate and the outer toothed ring is very small. The magnetic resistance of the closed magnetic circuit mainly depends on the air gap magnetic resistance between the inner toothed ring and the outer toothed ring. When the inner toothed ring and the outer toothed ring rotate relative to each other, the air gap magnetic resistance changes significantly, thereby improving the measurement accuracy. The waveform of the phase difference electrical signal output is stable and is not affected by the radial runout of the torsion shaft, greatly improving the measurement accuracy and sensitivity. This solution achieves torque measurement through the coordinated operation of the mounting housing, torsion shaft, outer toothed ring, and electromagnetic sensing components. Compared with existing technologies, it has strong applicability, high measurement accuracy and sensitivity, and strong practicality, making it suitable for widespread promotion and application.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a cross-sectional schematic diagram of the electromagnetic speed phase difference sensing device according to a preferred embodiment of the present invention.

[0022] Legend:

[0023] 100. Mounting housing; 110. Bearing; 200. Torsion shaft; 300. External toothed ring; 310. Circular surface; 320. External toothed ring surface; 400. Electromagnetic sensing assembly; 410. Internal toothed ring; 420. Sensing coil; 430. Cover plate. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0025] like Figure 1 As shown, the electromagnetic speed phase difference sensing device of this embodiment includes a mounting housing 100, a torsion shaft 200 rotatably arranged on the mounting housing 100, two external toothed rings 300 arranged inside the mounting housing 100 and oppositely arranged at opposite ends of the torsion shafts 200, and two electromagnetic sensing components 400 arranged inside the mounting housing 100 and corresponding one-to-one with the external toothed rings 300. The electromagnetic sensing component 400 includes an internal toothed ring portion 410 surrounding the external toothed rings 300, a sensing coil 420 arranged inside the internal toothed ring portion 410 for connecting to a power source to generate a magnetic field, and a cover plate 430 arranged inside the mounting housing 100 and sleeved on the external toothed rings 300 for pressing against the sensing coil 420 to fix the sensing coil 420 inside the internal toothed ring portion 410.

[0026] like Figure 1As shown, specifically, the electromagnetic speed phase difference sensing device of this utility model has a torsion shaft 200 mounted on a mounting housing 100, and two external toothed rings 300 are provided on both axial ends of the torsion shaft 200. Two electromagnetic sensing components 400 are arranged inside the mounting housing 100, with the electromagnetic sensing components 400 and the external toothed rings 300 arranged in a one-to-one correspondence. The electromagnetic sensing component 400 is encircled by an internal toothed ring portion 410 around the external toothed ring 300. A cover plate 430, fitted over the external toothed ring 300, presses against the sensing coil 420 to fix the sensing coil 420 inside the internal toothed ring portion 410. The sensing coil 420 is then connected to a power source. The internal toothed ring, sensing coil 420, cover plate 430, and external toothed ring 300 form a closed magnetic circuit. According to measurement requirements, a direct current of the same direction and magnitude can be supplied to the two sensing coils 420 through the power source, causing the closed magnetic circuit to generate a magnetic field with the required strength, thereby improving adaptability. The measurement accuracy is improved because, when the torsion shaft 200 rotates, the two electromagnetic sensing components 400 output a rotational speed phase difference signal, which is then measured by a corresponding instrument. During the measurement process, the closed magnetic circuit exhibits no magnetic saturation, and the air gap magnetic resistance between the cover plate 430 and the external toothed ring 300 is very small. The magnetic resistance of the closed magnetic circuit mainly depends on the air gap magnetic resistance between the internal toothed ring 410 and the external toothed ring 300. The air gap magnetic resistance changes significantly when the internal toothed ring 410 and the external toothed ring 300 rotate relative to each other, thus improving measurement accuracy. The waveform of the phase difference electrical signal output is stable and unaffected by the radial runout of the torsion shaft 200, greatly improving measurement accuracy and sensitivity. This solution achieves torque measurement through the coordinated operation of the mounting housing 100, torsion shaft 200, external toothed ring 300, and electromagnetic sensing components 400. Compared to existing technologies, it has strong applicability, high measurement accuracy and sensitivity, and is highly practical, making it suitable for widespread promotion and application.

[0027] It should be understood that the electromagnetic speed phase difference sensing device in this embodiment adopts an integrated design of electromagnetic excitation and magnetoelectric induction.

[0028] Optionally, the mounting housing 100 is made of a non-magnetic metal material. Optionally, the outer toothed ring 300 is made of a magnetic material. Optionally, the inner toothed ring seat is made of a magnetic material. Optionally, the cover plate 430 is made of a magnetic material.

[0029] like Figure 1As shown, in this embodiment, the external toothed ring 300 has an annular surface 310 and an external toothed ring surface 320 on its two axial ends, respectively. The cover plate 430 is fitted onto the annular surface 310, with the external toothed ring surface 320 facing the internal toothed ring portion 410. Specifically, since the cover plate 430 is fitted onto the annular surface 310 of the external toothed ring 300, the air gap magnetic resistance between the cover plate 430 and the external toothed ring 300 is very small in the closed magnetic circuit. This makes the magnetic resistance of the closed magnetic circuit mainly depend on the air gap magnetic resistance between the external toothed ring surface 320 and the internal toothed ring portion 410 of the external toothed ring 300, thus not causing excessive interference to the measurement results, thereby improving the measurement accuracy.

[0030] like Figure 1 As shown, in this embodiment, the internal toothed ring portion 410 is arranged in a central cylindrical shape. One axial end of the internal toothed ring portion 410 abuts against the cover plate 430, and the inner wall surface of the other axial end is an internal toothed ring surface corresponding to the external toothed ring surface 320. Specifically, the sensing coil 420 is accommodated by the central cylindrical internal toothed ring portion 410, and the axial end of the internal toothed ring portion 410 abuts against the cover plate 430, so that the sensing coil 420 is fixed in the internal toothed ring portion 410 by the cover plate 430, while ensuring that there is no air gap between the cover plate 430 and the internal toothed ring seat. By arranging the internal toothed ring surface and the external toothed ring surface 320 relative to each other, a periodic induced electromotive force is generated by the relative rotation of the internal toothed ring surface and the external toothed ring surface 320.

[0031] like Figure 1 As shown, in this embodiment, the tooth profile and number of teeth of the internal and external tooth ring surfaces 320 are the same. Specifically, by making the tooth profiles of the internal and external tooth ring surfaces 320 the same, the consistency of their relative motion is ensured, which is beneficial for generating a stable electrical signal. When the torsion shaft 200 rotates, the tooth tips and tooth valleys of the gears on the external tooth ring surface 320 will alternately sweep across the internal tooth ring surface, causing periodic changes in the air gap magnetoresistance and the magnetic flux inside the sensing coil 420. Since the tooth profile and number of teeth of the internal and external tooth ring surfaces 320 are the same, this change is stable and can generate an AC point signal that is approximately sinusoidal. The phase difference of these signals is proportional to the torsion angle of the torsion shaft 200, which can then be used to measure torque.

[0032] like Figure 1 As shown, in this embodiment, the number of teeth on the internal gear ring surface ranges from 110 to 130. Specifically, when the number of teeth on the internal gear ring surface is between 110 and 130, the sensitivity is high, which can effectively reduce the relative error of torque measurement, resulting in high measurement accuracy, while the manufacturing difficulty and cost are relatively reasonable. When the number of teeth on the internal gear ring surface is less than 110, the sensitivity is low, and the measurement accuracy is relatively low. When the number of teeth on the internal gear ring surface exceeds 130, the manufacturing difficulty and cost are high. Preferably, the number of teeth on the internal gear ring surface is 120 to facilitate design calculations.

[0033] like Figure 1 As shown, in this embodiment, the radial outer wall surface of the internal toothed ring portion 410 and the radial inner wall surface of the mounting housing 100 are fitted together. Specifically, the internal toothed ring portion 410 is reliably mounted in the mounting housing 100 by surface-to-surface fitting.

[0034] In this embodiment, the mounting housing 100 is provided with a limiting protrusion for axially limiting the internal toothed ring portion 410. Specifically, the limiting protrusion axially limits the internal toothed ring portion 410 to ensure that the relative position between the internal toothed ring surface and the external toothed ring surface 320 is accurate and reliable.

[0035] In this embodiment, the winding direction of the sensing coil 420 is clockwise. Specifically, when the magnetic flux in the magnetic field changes, an induced electromotive force (EMF) is generated in the sensing coil 420. The winding direction of the sensing coil 420 determines the direction of the induced EMF. Under specific magnetic field changes, the clockwise winding sensing coil 420 will generate an induced EMF in the expected direction, which facilitates subsequent signal processing and measurement. The working principle of the electromagnetic speed phase difference sensing device is to calculate the torque by measuring the phase difference of the induced EMF in the two sensing signals. The clockwise winding sensing coil 420 can ensure that when the torsion shaft 200 rotates, due to the periodic changes in magnetic reluctance and magnetic flux, the induced EMF generated in the two sensing coils 420 has a stable phase relationship, thereby improving the accuracy and reliability of the measurement results.

[0036] like Figure 1 As shown, in this embodiment, the torsion shaft 200 is an elastic shaft arranged symmetrically on both sides. Specifically, by adopting an elastic shaft arranged symmetrically on both sides, the torsion shaft 200 can generate stable torsional deformation when subjected to torque, and the force on the left and right sides is more balanced, thereby avoiding the generation of additional bending moment or torsional deformation, thus ensuring the accuracy of the measurement results. In addition, in practical applications, the torsion shaft 200 may be subjected to lateral forces, such as installation errors, bearing 110 friction, etc. The symmetrical design can effectively counteract the influence of these lateral forces, making the measurement results more stable and reliable.

[0037] like Figure 1 As shown, in this embodiment, the mounting housing 100 is arranged in a hollow cylindrical shape. Mounting grooves are respectively provided at both axial ends of the mounting housing 100, and bearings 110 for supporting the torsion shaft 200 are arranged within the mounting grooves. Specifically, by accommodating bearings 110 in the two mounting grooves, the two bearings 110 respectively support the axial ends of the torsion shaft 200, allowing the torsion shaft 200 to be rotatably mounted on the mounting housing 100, thereby facilitating torque measurement.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic speed phase difference sensing device, characterized in that, The device includes a mounting housing (100), a torsion shaft (200) rotatably mounted on the mounting housing (100), two external toothed rings (300) mounted inside the mounting housing (100) and positioned opposite each other on the torsion shafts (200), and two electromagnetic sensing components (400) mounted inside the mounting housing (100) and corresponding to the external toothed rings (300). The electromagnetic sensing components (400) include an internal toothed ring portion (410) surrounding the external toothed rings (300), a sensing coil (420) mounted inside the internal toothed ring portion (410) for connecting to a power source to generate a magnetic field, and a cover plate (430) mounted inside the mounting housing (100) and fitted around the external toothed rings (300) for pressing against the sensing coil (420) to fix the sensing coil (420) inside the internal toothed ring portion (410).

2. The electromagnetic rotational speed phase difference sensing device according to claim 1, characterized in that, The external toothed ring (300) has an annular surface (310) and an external toothed ring surface (320) on its two axial ends respectively. The cover plate (430) is fitted on the annular surface (310), and the external toothed ring surface (320) faces the internal toothed ring part (410).

3. The electromagnetic rotational speed phase difference sensing device according to claim 2, characterized in that, The internal toothed ring (410) is arranged in a central cylindrical shape. One axial end of the internal toothed ring (410) abuts against the cover plate (430), and the inner wall surface of the other axial end is an internal toothed ring surface that corresponds to the external toothed ring surface (320).

4. The electromagnetic rotational speed phase difference sensing device according to claim 3, characterized in that, The tooth profile and number of teeth are the same on the internal tooth ring surface and the external tooth ring surface (320).

5. The electromagnetic rotational speed phase difference sensing device according to claim 4, characterized in that, The number of teeth on the internal gear ring ranges from 110 to 130.

6. The electromagnetic speed phase difference sensing device according to claim 3, characterized in that, The radial outer wall surface of the internal toothed ring (410) and the radial inner wall surface of the mounting housing (100) are in contact.

7. The electromagnetic rotational speed phase difference sensing device according to any one of claims 1-6, characterized in that, The mounting housing (100) has a limiting protrusion for axially limiting the internal gear ring (410).

8. The electromagnetic rotational speed phase difference sensing device according to any one of claims 1-6, characterized in that, The sensing coil (420) is wound in a clockwise direction.

9. The electromagnetic rotational speed phase difference sensing device according to any one of claims 1-6, characterized in that, The torsion shaft (200) is an elastic shaft arranged symmetrically on the left and right.

10. The electromagnetic speed phase difference sensing device according to any one of claims 1-6, characterized in that, The mounting housing (100) is arranged in a hollow cylindrical shape. Mounting grooves are provided at both ends of the mounting housing (100) along the axial direction. Bearings (110) for supporting the torsion shaft (200) are arranged in the mounting grooves.

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