Stator receiving coil of eddy current torque sensor

Abstract

The utility model discloses a stator receiving coil of an eddy current torque sensor, which relates to the field of torque sensors, solves the problem that the induction electromotive force is possibly generated when a rotor does not work to influence the signal receiving accuracy, and adopts the following scheme that the stator receiving coil comprises a group of complete coils and a rotor, the receiving coil is formed by connecting a wire in a positive and negative connection mode, and the positive and negative connection receiving coils are the same in structure and are symmetrical; the receiving coil is laid along a circular loop, the receiving coil is of a rhombic structure, the coverage angle of the receiving coil is a 40-degree period, and the coverage angle of the loop of the positively and negatively connected receiving coil corresponds to a rotor period; according to the stator receiving coil of the eddy current torque sensor, through the arrangement of the overall symmetrical structure of the receiving coil, it is ensured that the output induced electromotive force of a system is zero when no rotor acts, interference of the system is effectively eliminated through the design, and the accuracy of signal receiving is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of torque sensors, in particular to a stator receiving coil of an eddy current torque sensor. Background Art

[0002] Eddy current torque sensor has the advantages of simple structure, easy integration, high measurement accuracy, good applicability and effectiveness, and is one of the development directions of EPS torque sensor. The electromagnetic structure of eddy current torque sensor includes excitation coil, rotor and receiving coil; under the step change of magnetic field, as the rotor rotates, induced electromotive force will be generated on the receiving coil. The structural design of the receiving coil has an important influence on the accuracy and stability of the signal;

[0003] After searching, the application with patent number 101980915A discloses a non-contact torque sensor for a steering system. The torque sensor is installed between an input shaft connected to the steering wheel of the vehicle and an output shaft connected to the wheel of the vehicle to detect the torsion caused by the rotation operation of the steering wheel. The torque sensor includes: a magnetic force generating part, which is connected to the input shaft and has a plurality of north pole magnets and a plurality of south pole magnets alternately arranged on the outer peripheral surface, and the distances of these magnets to the center are the same; a cylindrical magnetic shielding part, which is connected to the output shaft and includes a plurality of holes respectively arranged in the areas where the north pole magnet and the south pole magnet are located; a magnetic detection part, which is separated from the outer surface of the magnetic shielding part and detects the magnetic force passing through the plurality of holes; and a magnetic detection sensor part, which is arranged on the outer surface of the magnetic detection part to detect the relative torsion change between the magnetic force generating part and the magnetic shielding part. Therefore, the present invention can detect the magnitude of the torque of the output shaft with only one magnetic induction, without the need for two magnetic inductions;

[0004] The above application document realizes torque detection by setting up the magnetic screen part, while the receiving coil still adopts the traditional coil. The traditional coil may induce electromotive force even when there is no electronic rotation due to the different coils and asymmetric settings. The system itself may have interference, which reduces the accuracy of signal reception.

[0005] Therefore, we propose a stator receiving coil for an eddy current torque sensor. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a stator receiving coil of an eddy current torque sensor, which solves the problem that the induced electromotive force may be generated when the rotor is not working and affect the accuracy of signal reception.

[0007] To achieve the above purpose, the utility model is implemented by the following technical solutions: a stator receiving coil of an eddy current torque sensor, including a receiving coil and a rotor inside the receiving coil, the receiving coil is a complete set of coils, the receiving coil is formed by a wire connected in a forward and reverse connection manner, and the forward and reverse connected receiving coils have the same and symmetrical structures;

[0008] The receiving coil is laid along a circular loop, the receiving coil is a diamond structure, the coverage angle of the receiving coil is a 40-degree period, and the coverage angle of the loop of the forward and reverse connected receiving coil corresponds to the rotor period.

[0009] Preferably, when the center of the rotor is at the center position 1-100 of the forward and reverse receiving coil, the induced voltages at S1 and S2 are opposite in direction and have the same magnitude, and the amplitude of the output signal of the receiving coil is 0.

[0010] Preferably, when the center of the rotor is at position 1-101, the covering position of the rotor is half of the forward and reverse receiving coils, and the induced voltage amplitude at S1 and S2 is the largest.

[0011] Preferably, when the center of the rotor is at position 1-102, the covering position of the rotor is the center position of the forward and reverse receiving coils, and the induced voltage amplitude at S1 and S2 is 0.

[0012] Preferably, the same side of the receiving coil is arranged to change clockwise at the same time, and the other side is placed on the second layer, connected in the middle through a via hole, and each group completes the positive and negative connection of the independent receiving coil through a loop in the upper and lower layers.

[0013] The utility model provides a stator receiving coil of an eddy current torque sensor, which has the following beneficial effects:

[0014] The stator receiving coil of the eddy current torque sensor ensures that the output induced electromotive force of the system is zero when there is no rotor action by setting the overall symmetrical structure of the receiving coil. This design effectively eliminates the interference of the system itself and improves the accuracy of signal reception. Through the stacking design and via connection, the wiring of each group of receiving coils is more compact, reducing the occupied space, and each group of receiving coils is an independent unit, which is easy to expand and maintain. If the product needs to increase the receiving channel or improve the resolution accuracy, the number of receiving coils can be easily increased or their layout can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of three groups of coil signal channels of the utility model;

[0017] Figure 3 For this utility model Figure 2 Schematic diagram of the structure of the local graph;

[0018] Figure 4 For this utility model Figure 2 Schematic diagram of the structure of a local graph.

[0019] In the figure: 1-1, receiving coil. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-4 The embodiment of the utility model provides a technical solution: a stator receiving coil of an eddy current torque sensor, including a receiving coil 1-1 and a rotor inside the receiving coil 1-1, the receiving coil 1-1 is a complete set of coils, the receiving coil 1-1 is connected by a wire in a forward and reverse connection manner, and the forward and reverse connected receiving coils 1-1 have the same and symmetrical structures; the receiving coil 1-1 is laid along a circular loop, the receiving coil 1-1 is a diamond structure, the coverage angle of the receiving coil 1-1 is a 40-degree period, and the coverage angle of the loop of the forward and reverse connected receiving coil 1-1 corresponds to the rotor period.

[0022] When the center of the rotor is at the center position 1-100 of the forward and reverse connected receiving coil 1-1, the induced voltages at S1 and S2 are opposite in direction and have the same magnitude, and the amplitude of the output signal of the receiving coil 1-1 is 0.

[0023] When the center of the rotor is at position 1-101, the covering position of the rotor is half of the forward and reverse receiving coil 1-1, and the induced voltage amplitude at S1 and S2 is the largest.

[0024] When the center of the rotor is at position 1-102, the covering position of the rotor is the center position of the forward and reverse receiving coil 1-1, and the induced voltage amplitude at S1 and S2 is 0.

[0025] Among them, the stator receiving coil of the eddy current torque sensor ensures that the output induced electromotive force of the system is zero when there is no rotor action through the setting of the overall symmetrical structure of the receiving coil 1-1. This design effectively eliminates the interference of the system itself and improves the accuracy of signal reception.

[0026] at the same time, Figure 2The three groups of receiving coils 1-1 form a signal channel. The phase difference of the output signals of each group of receiving coils 1-1 is 120 degrees, and the actual arrangement angle difference is 40 / 3 degrees.

[0027] Embodiment 2:

[0028] like Figure 3 , Figure 4 As shown, the same side of the receiving coil 1-1 is arranged to change clockwise at the same time, and the other side is placed on the second layer, connected in the middle through vias, and each group completes the positive and negative connection of the independent receiving coil 1-1 through a loop in the upper and lower layers.

[0029] Among them, through the stacking design and via connection, the wiring of each group of receiving coils 1-1 is more compact, reducing the occupied space, and each group of receiving coils 1-1 is an independent unit, which is convenient for expansion and maintenance. If the product needs to increase the receiving channel or improve the resolution accuracy, the number of receiving coils 1-1 can be easily increased or its layout can be adjusted.

[0030] The working principle and use process of the utility model are as follows: the receiving coils 1-1 are assembled in layers by stacking and connecting vias. When the center position of the rotor is at 1-100, it is exactly at the center position of a pair of positive and negative receiving coils 1-1, and the induced voltages in S1 and S2 are opposite in direction and the same in magnitude, so the output signal amplitude of a group of receiving coils 1-1 at this time is 0; when the center position of the rotor is at 1-101, it just completely covers half of a pair of positive and negative receiving coils 1-1, and the induced voltage amplitude in S1 and S2 reaches the maximum at this time; when the center position of the rotor is at 1-102, it is exactly at the center position of a pair of positive and negative receiving coils 1-1, and the induced voltages in S3 and S4 are opposite in direction and the same in magnitude, so the output signal amplitude of a group of receiving coils 1-1 at this time is 0, thereby obtaining a signal whose output voltage amplitude changes periodically with the rotation of the rotor position.

[0031] 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.

[0032] 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 receiving coil of an eddy current torque sensor, characterized in that: It comprises a receiving coil (1-1) and a rotor inside thereof, wherein the receiving coil (1-1) is a complete set of coils, and the receiving coil (1-1) is formed by connecting a wire in a forward and reverse connection manner, and the forward and reverse connected receiving coils (1-1) have the same structure and are symmetrical; The receiving coil (1-1) is laid along a circular loop, the receiving coil (1-1) is a diamond structure, the coverage angle of the receiving coil (1-1) is a 40-degree period, and the coverage angle of the loop of the forward and reverse connected receiving coil (1-1) corresponds to the rotor period.

2. The stator receiving coil of the eddy current torque sensor according to claim 1, characterized in that: When the center of the rotor is at the center position 1-100 of the forward and reverse connected receiving coil (1-1), the induced voltages at S1 and S2 are opposite in direction and have the same magnitude, and the amplitude of the output signal of the receiving coil (1-1) is 0.

3. The stator receiving coil of the eddy current torque sensor according to claim 1, characterized in that: When the center of the rotor is at position 1-101, the covering position of the rotor is half of the forward and reverse receiving coil (1-1), and the induced voltage amplitude at S1 and S2 is the largest.

4. The stator receiving coil of the eddy current torque sensor according to claim 1, characterized in that: When the center of the rotor is at position 1-102, the covering position of the rotor is the center position of the forward and reverse receiving coil (1-1), and the induced voltage amplitude at S1 and S2 is 0.

5. The stator receiving coil of the eddy current torque sensor according to claim 1, characterized in that: The same side of the receiving coil (1-1) is arranged to change clockwise at the same time, and the other side is placed on the second layer. The middle is connected through a via hole. Each group completes the positive and negative connection of the independent receiving coil (1-1) through a loop in the upper and lower layers.

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