Stator coil of non-contact electromagnetic torque sensor

Abstract

The utility model discloses a stator coil of a non-contact electromagnetic torque sensor, which relates to the field of non-contact electromagnetic torque sensors, solves the problem that the magnetic field of the existing coil is unstable, and adopts the following scheme: the stator coil comprises a first base layer and a second base layer which are opposite in position, coil penetrating grooves are formed in the first base layer and the second base layer, each coil penetrating groove is composed of three sets of spiral coil grooves in the outer side and two sets of spiral coil grooves in the inner side, and coil penetrating holes located between the spiral coil grooves in the inner side and the outer side of each coil penetrating groove are further formed in the first base layer and the second base layer; according to the stator coil of the non-contact electromagnetic torque sensor, through arrangement of the components on the first base layer and the second base layer, the number of turns of coils on different layers is reduced, and interference between the coils is reduced; and the field intensity anisotropic magnetic field of the coils on the same layer can generate superposition consumption, so that the interference of the anisotropic magnetic field is further reduced, and the uniformity and the stability of the magnetic field are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of non-contact electromagnetic torque sensors, in particular to a stator coil of a non-contact electromagnetic torque sensor. Background Art

[0002] With the development of emerging disciplines such as micro-electromechanical systems and artificial muscles, torque sensors are widely used in the measurement of torsional mechanical properties of materials, torque of micro-motors, etc. Electromagnetic torque sensors work based on the Faraday electromagnetic induction principle and determine the torque value by measuring the change in magnetic field caused by torque. This sensor has the characteristics of non-contact measurement, which can avoid problems such as friction, wear and precision loss that may exist in traditional contact measurement. The excitation coil in the stator coil is an important component of the sensor, and its design directly affects the performance of the sensor. The shape, number of turns, wiring method, etc. of the excitation coil, these factors jointly determine the inductive performance, electrical characteristics and mechanical strength of the coil;

[0003] After searching, the application with patent number 202110713187.X discloses a non-contact torque sensor, which uses a flexible pivot as a torsional elastic element. The sample to be tested is clamped on a lower support connected to the flexible pivot by a chuck. When the sample is deflected, the torque applied to the sample is transmitted to the flexible pivot through the chuck and the lower support in turn, causing the flexible pivot to deflect, that is, the torque applied to the sample is the same as the torque of the flexible pivot. The deflection angle of the flexible pivot measured by the measuring unit is multiplied by its stiffness coefficient to obtain the torque of the sample to be tested. Compared with existing torque sensors, it has a simple structure and reduces the difficulty of the manufacturing process;

[0004] In the torque sensor of the above application document, the sensor directly utilizes the magnetic field in the Z direction and directly lays out two layers of independent planar spiral coils. At higher frequencies, certain anisotropic magnetic field interference is easily generated between the coil layers, resulting in uneven and unstable excitation signals of the original field strength, which affects the output performance of the sensor.

[0005] Therefore, we propose a stator coil for a contactless electromagnetic torque sensor. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides a stator coil of a contactless electromagnetic torque sensor, which solves the problem that a certain amount of anisotropic magnetic field interference is easily generated between the existing coil layers, resulting in uneven and unstable excitation signals of the original field strength, thereby affecting the output performance of the sensor.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a stator coil of a contactless electromagnetic torque sensor, including a first base layer and a second base layer that are relatively positioned, wherein the first base layer and the second base layer are provided with coil slots, wherein the coil slots are composed of three groups of spiral coil slots on the outside and two groups of spiral coil slots on the inside, and the first base layer and the second base layer are also provided with coil through holes located between the spiral coil slots on the inside and outside of the coil slots, wherein the three outer groups of spiral coil slots in the coil slots on the first base layer are connected with the two inner groups of spiral coil slots in the coil through holes on the second base layer through the coil through holes, and wherein the first coil is installed therein, wherein the two inner groups of spiral coil slots in the coil slots on the first base layer are connected with the three outer groups of spiral coil slots in the coil through holes on the second base layer through the coil through holes, and wherein the second coil is installed therein.

[0008] Preferably, the coil penetration grooves on the first base layer and the second base layer are both made by a photolithography machine.

[0009] Preferably, the first coil and the second coil are both 5-turn coils, and their outer diameters are both 26 mm.

[0010] Preferably, the first coil and the second coil are staggered.

[0011] The utility model provides a stator coil of a non-contact electromagnetic torque sensor, which has the following beneficial effects:

[0012] The stator coil of the contactless electromagnetic torque sensor reduces the number of turns of coils in different layers and reduces interference between coils by arranging the components on the first base layer and the second base layer; and the field strength anisotropic magnetic fields of the coils on the same layer will produce superposition consumption, further reducing the interference of the anisotropic magnetic fields and improving the uniformity and stability of the magnetic field. At the same time, the use of staggered two-layer coils can enhance the uniformity of the magnetic field, help improve the measurement accuracy and stability of the sensor, reduce the error caused by the uneven magnetic field, and effectively reduce the impact of external electromagnetic interference on the sensor performance, which helps to improve the anti-interference ability of the sensor. The compact design of the planar spiral coil makes the contactless torque sensor easier to miniaturize, easy to install and integrate, and further reduce the cost of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of the utility model from the side;

[0015] Figure 3 It is a schematic diagram of the structure of the coil perforation of the utility model.

[0016] In the figure: 1, first base layer; 2, second base layer; 2-1, coil slot; 2-2, coil hole; 3, first coil; 4, second coil. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3 The embodiment of the utility model provides a technical solution: a stator coil of a contactless electromagnetic torque sensor, including a first base layer 1 and a second base layer 2 which are positioned opposite to each other, a coil through slot 2-1 is provided on the first base layer 1 and the second base layer 2, the coil through slot 2-1 is composed of three groups of spiral coil slots on the outside and two groups of spiral coil slots on the inside, the first base layer 1 and the second base layer 2 are also provided with a coil through hole 2-2 located between the spiral coil slots on the inner and outer sides of the coil through slot 2-1, the outer three groups of spiral coil slots in the coil through slot 2-1 on the first base layer 1 The inner two groups of spiral coil grooves in the coil through-hole 2-2 on the second base layer 2 are connected through the coil through-hole 2-2, and the first coil 3 is installed therein. The inner two groups of spiral coil grooves in the coil through-hole 2-1 on the first base layer 1 are connected with the outer three groups of spiral coil grooves in the coil through-hole 2-2 on the second base layer 2 through the coil through-hole 2-2, and the second coil 4 is installed therein. The coil through-hole 2-1 on the first base layer 1 and the second base layer 2 are both prepared by a photolithography machine. The first coil 3 and the second coil 4 are both 5-turn coils, and their outer diameters are both 26 mm. The first coil 3 and the second coil 4 are staggered.

[0019] Among them, the stator coil of the non-contact electromagnetic torque sensor reduces the number of turns of coils in different layers by setting various components on the first base layer 1 and the second base layer 2, thereby reducing the interference between coils; and the field strength anisotropic magnetic fields of the coils on the same layer will produce superposition consumption, further reducing the interference of the anisotropic magnetic fields and improving the uniformity and stability of the magnetic field. At the same time, the use of staggered two-layer coils can enhance the uniformity of the magnetic field, help improve the measurement accuracy and stability of the sensor, reduce the errors caused by uneven magnetic fields, and effectively reduce the impact of external electromagnetic interference on sensor performance, which helps to improve the anti-interference ability of the sensor. The compact design of the planar spiral coil makes the non-contact torque sensor easier to miniaturize, easy to install and integrate, and further reduce the cost of the overall system.

[0020] The working principle and use process of the utility model are as follows: the coil groove 2-1 and the coil hole 2-2 are photoetched on the first base layer 1 and the second base layer 2 in advance, and then the first coil 3 and the second coil 4 are assembled. The coils are laid in two staggered layers to enhance the uniformity of the magnetic field, which helps to improve the measurement accuracy and stability of the sensor, reduce the error caused by the uneven magnetic field, and effectively reduce the impact of external electromagnetic interference on the performance of the sensor. It solves the problem that a certain anisotropic magnetic field interference is easily generated between the existing coil layers, resulting in uneven and unstable excitation signals of the original field strength, thereby affecting the output performance of the sensor.

[0021] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0022] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A stator coil of a non-contact electromagnetic torque sensor, characterized in that: The invention comprises a first base layer (1) and a second base layer (2) which are positioned opposite to each other. The first base layer (1) and the second base layer (2) are provided with coil through slots (2-1), the coil through slots (2-1) being composed of three groups of spiral coil slots on the outside and two groups of spiral coil slots on the inside. The first base layer (1) and the second base layer (2) are also provided with coil through holes (2-2) located between the spiral coil slots on the inside and outside of the coil through slots (2-1). The three groups of spiral coil slots on the outside of the coil through slots (2-1) on the first base layer (1) are connected to the two groups of spiral coil slots on the inside of the coil through holes (2-2) on the second base layer (2) through the coil through holes (2-2), and a first coil (3) is mounted therein. The two groups of spiral coil slots on the inside of the coil through slots (2-1) on the first base layer (1) are connected to the three groups of spiral coil slots on the outside of the coil through holes (2-2) on the second base layer (2) through the coil through holes (2-2), and a second coil (4) is mounted therein.

2. The stator coil of a non-contact electromagnetic torque sensor according to claim 1, characterized in that: The coil penetration slots (2-1) on the first base layer (1) and the second base layer (2) are both prepared by a photolithography machine.

3. The stator coil of a non-contact electromagnetic torque sensor according to claim 1, characterized in that: The first coil (3) and the second coil (4) are both 5-turn coils, and their outer diameters are both 26 mm.

4. The stator coil of a non-contact electromagnetic torque sensor according to claim 1, characterized in that: The first coil (3) and the second coil (4) are arranged in an alternating manner.

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