The target wheel and motor shaft of the resolver

Abstract

This invention belongs to the field of eddy current sensors, and specifically relates to a target wheel for eddy current resolvers and a motor shaft having the target wheel. The target wheel for the resolver is characterized by including a connecting sleeve and multiple wheel pieces arranged circumferentially with gaps between adjacent pieces. The central ends of the multiple wheel pieces are connected to each other, and the outer ends of the multiple wheel pieces are connected to the end face of the connecting sleeve. This invention significantly reduces the outer diameter of the target wheel by changing the position of the wheel pieces and the connection relationship between the wheel pieces and the connecting sleeve, thereby enabling the design of smaller eddy current resolvers and meeting the requirements for miniaturized product design.

Description

Technical Field

[0001] This utility model belongs to the field of eddy current sensors, and specifically relates to a target wheel of eddy current resolvers and a motor shaft having the target wheel. Background Technology

[0002] Eddy current sensor technology is a non-contact detection technique that uses electromagnetic induction principles to transmit and receive induced AC signals via coils at both the transmitting and receiving ends, calculating the position of a target wheel. The target wheel is fixed to the shaft and rotates together with the rotor. By detecting the position of the target wheel, the relative position of the motor rotor and stator can be calculated, thus optimizing motor torque and efficiency. Currently, eddy current sensors are widely used in motor rotor position detection.

[0003] Chinese patent CN117606338A, entitled "A Target Wheel for an Eddy Current Sensor and Its Manufacturing Method", discloses a target wheel structure, which includes a connecting sleeve fitted on a motor shaft and a plurality of blades distributed on the outer circumferential surface of the connecting sleeve. The blades of this structure are arranged on the circumferential surface of the connecting sleeve, and the outer diameter of the target wheel is relatively large, which is not conducive to the miniaturization of the product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention improves the structure of the target wheel by reducing its diameter, thus meeting the equipment's requirement for miniaturization of the eddy current sensor.

[0005] The technical solution of this utility model is as follows: The target wheel of the rotation includes a connecting sleeve and multiple wheel pieces. The multiple wheel pieces are circumferentially distributed and there are gaps between adjacent wheel pieces. The central ends of the multiple wheel pieces are connected to each other, and the outer ends of the multiple wheel pieces are connected to the end face of the connecting sleeve.

[0006] Furthermore, the inner wall of the connecting sleeve is provided with at least one limiting groove, which is arranged axially and one end of the limiting groove is connected to the end face of the connecting sleeve.

[0007] Furthermore, the outer circumferential surface of the connecting sleeve is provided with a connecting countersunk hole.

[0008] Furthermore, the wheel is triangular in shape, with the apexes of the triangles connected to each other, and a bent portion at the tail end of the wheel, which is connected to the end face of the connecting sleeve.

[0009] Furthermore, the connecting sleeve is integrally formed with multiple wheel pieces.

[0010] Furthermore, at least one set of locking parts is provided on the connecting sleeve away from the wheel piece, and the locking parts are used to lock the target wheel and the load-bearing component.

[0011] Furthermore, the snap-fit ​​portion includes an elastic arm connected to the connecting sleeve, and the elastic arm is provided with a snap-fit ​​protrusion.

[0012] Furthermore, the snap-fit ​​part includes a snap-fit ​​protrusion disposed on the end face of the connecting sleeve. The other end of the snap-fit ​​protrusion is divided into two elastic parts by a groove, and locking protrusions are respectively provided on the outer side of the two elastic parts.

[0013] The motor shaft includes a shaft body and the aforementioned resolver target wheel, which is disposed at one end of the shaft body.

[0014] In summary, this utility model has the following beneficial effects: The connecting sleeve of this utility model is a cylindrical ring that is fitted onto the motor shaft. The wheel of this utility model is located at the end of the connecting sleeve. By changing the position of the wheel and the connection relationship between the wheel and the connecting sleeve, the outer diameter of the target wheel is greatly reduced, thereby enabling the design of smaller eddy current resolvers and meeting the requirements of product miniaturization design for resolvers. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the target wheel of this utility model; Figure 2 This is a three-dimensional schematic diagram of the target wheel (with a limiting groove) of this utility model; Figure 3 This is a three-dimensional schematic diagram of the target wheel (with a connecting countersunk hole) of this utility model; Figure 4 This is a cross-sectional schematic diagram of the target wheel and motor shaft of this utility model; Figure 5 This is a three-dimensional schematic diagram of the target wheel (with a snap-fit ​​part) of this utility model; Figure 6 For the present utility model Figure 5 The diagram shows a cross-sectional view of the target wheel after it is connected to the motor shaft. Figure 7 This is a three-dimensional schematic diagram of the motor shaft of this utility model; In the diagram, 1 is the connecting sleeve, 10 is the limiting groove, 11 is the connecting countersunk hole, 12 is the snap-fit ​​part, 120 is the elastic arm, 121 is the snap-fit ​​protrusion, 122 is the snap-fit ​​protrusion, 123 is the groove, 124 is the elastic part, and 125 is the locking protrusion. 2 represents the wheel piece, 20 represents the clearance, and 21 represents the bend. 3 is the axle, and 4 is the target wheel. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0017] It should be noted that when a component is referred to as being "set on" or "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "fixed to" another component, or "fixedly connected" to another component, the fixing method can be detachable or non-detachable. When a component is considered to be "connected" or "rotatably connected" to another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used are for illustrative purposes only and do not represent the only possible implementation.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] In this invention, terms such as "first," "second," and "third" are used not to represent specific quantities or orders, but merely to distinguish names.

[0020] In existing technologies, the blades of the target wheel are all set on the outer peripheral surface, which increases the size of the product and is not conducive to the miniaturization design of products using eddy current sensors.

[0021] See Figure 1 As shown, the target wheel of the rotation includes a connecting sleeve 1 and multiple wheel pieces 2. The multiple wheel pieces 2 are circumferentially distributed, and there is a gap 20 between adjacent wheel pieces 2. The central ends of the multiple wheel pieces 2 are connected to each other, and the outer ends of the multiple wheel pieces 2 are connected to the end face of the connecting sleeve 1.

[0022] The connecting sleeve of this utility model is a cylindrical ring that is fitted onto the motor shaft. The wheel of this utility model is located at the end of the connecting sleeve. By changing the position of the wheel and the connection relationship between the wheel and the connecting sleeve, the outer diameter of the target wheel is greatly reduced, thereby enabling the design of smaller eddy current resolvers and meeting the requirements of product miniaturization design for resolvers.

[0023] In this invention, the target wheel and the motor shaft are fixed by connecting the connecting sleeve and the motor shaft. Preferably, the connecting sleeve is fitted onto the motor shaft, and the two are fixed by an interference fit. To further improve the reliability of the connection, see [reference needed]. Figure 2 As shown, the inner wall of the connecting sleeve 1 is provided with at least one limiting groove 10. The limiting groove is arranged axially and one end of the limiting groove is connected to the end face of the connecting sleeve. In one embodiment of the present invention, the inner wall of the connecting sleeve is provided with two limiting grooves, and the corresponding motor shaft is provided with a limiting protrusion that cooperates with the limiting groove. Since the motor shaft rotates at high speed, the cooperation between the limiting protrusion and the limiting groove can prevent the target wheel from rotating relative to the motor shaft, ensuring the reliability of the connection between the target wheel and the motor shaft. In addition, the limiting groove adopts a symmetrical structure design to ensure the dynamic balance of the equipment and reduce the generation of noise.

[0024] This utility model provides an alternative connection method, see [link to related documentation] Figure 3 As shown, the outer circumferential surface of the connecting sleeve 1 is provided with a countersunk hole 11, and the corresponding motor shaft is provided with a threaded hole. When the target wheel is connected to the motor shaft, the fastening screw passes through the countersunk hole and the threaded hole to achieve the fastening of the connecting sleeve and the motor shaft, thus ensuring the reliability of the connection between the connecting sleeve and the motor shaft.

[0025] Next, the structure of the target wheel will be described, specifically the shape of the wheel piece. The wheel piece 2 is triangular in shape, and the apexes of the triangle of the wheel piece 2 are connected to each other. The tail end of the wheel piece 2 is provided with a bent part 21, which is connected to the end face of the connecting sleeve 1. Specifically, in one embodiment of this utility model, there are 4 wheel pieces, which are evenly arranged in a circle.

[0026] The connecting sleeve is integrally formed with multiple wheel pieces. The connecting sleeve and wheel pieces can be processed by stamping or casting. The connecting sleeve and wheel pieces are preferably made of steel.

[0027] Unlike the aforementioned connection method between the connecting sleeve and the motor shaft, other structural forms are presented here to ensure the fixation between the target wheel and the motor shaft.

[0028] In one embodiment of this utility model, see Figure 4 As shown, at least one set of locking parts 12 is provided on the connecting sleeve 1 away from the wheel piece. The locking parts 12 are used to lock the target wheel and the bearing component. The bearing component is the motor shaft. When the connecting sleeve of the target wheel is sleeved with the motor shaft, the locking parts will connect with the corresponding structure on the motor shaft to achieve axial and circumferential locking between the target wheel and the motor shaft, ensuring the reliability of the connection between the target wheel and the motor shaft when the motor shaft rotates at high speed.

[0029] In one embodiment of this utility model, participants Figure 4 As shown, the snap-fit ​​part 12 includes an elastic arm 120 connected to the connecting sleeve. The elastic arm 120 is provided with a snap-fit ​​protrusion 121. The surface of the corresponding motor shaft is provided with a groove that cooperates with the snap-fit ​​protrusion. When the target wheel and the motor shaft are assembled, the elastic arm is forced to tilt outward. After the connecting sleeve and the motor shaft are in place, the snap-fit ​​protrusion is engaged in the groove of the motor shaft, thereby locking the target wheel and the motor shaft, thus achieving axial and circumferential locking of the target wheel and the motor shaft.

[0030] In one embodiment of this utility model, see Figure 5 and Figure 6 As shown, the snap-fit ​​part 12 includes a snap-fit ​​protrusion 122 disposed on the end face of the connecting sleeve 1. The other end of the snap-fit ​​protrusion 122 is divided into two elastic parts 124 by the slot 123. Locking protrusions 125 are respectively provided on the outer surfaces of the two elastic parts 124. Correspondingly, the motor shaft in this embodiment is provided with a shoulder. The connecting sleeve is fitted on the shoulder, and after fitting, the outer diameter of the connecting sleeve is the same as the outer diameter of the motor shaft, ensuring that the outer circumferential surface of the connecting shaft is flush with the outer circumferential surface of the motor shaft. The end face of the shoulder of the motor shaft is provided with an insertion groove that cooperates with the snap-fit ​​part. When inserted, the elastic parts on the connecting sleeve are first pressed together. When the connecting sleeve and the motor shaft are assembled in place, the elastic parts are pressed and contact each other. The elastic parts rebound so that the locking protrusion cooperates with the insertion groove on the motor shaft to lock, thereby realizing the axial and circumferential locking of the target wheel and the motor shaft.

[0031] See Figure 7 As shown, the motor shaft includes a shaft body 3 and the aforementioned resolver target wheel 4. The resolver target wheel is located at one end of the shaft body, and a specific connecting sleeve is fitted onto the shaft body, with the wheel plate located at one end of the shaft body.

[0032] This invention improves the structure of the target wheel and the connection method between the target wheel and the motor shaft, making the miniaturization design of the target wheel possible and also meeting the design requirements for the miniaturization of the motor.

[0033] In summary, this utility model has the following beneficial effects: The connecting sleeve of this utility model is a cylindrical ring that is fitted onto the motor shaft. The wheel of this utility model is located at the end of the connecting sleeve. By changing the position of the wheel and the connection relationship between the wheel and the connecting sleeve, the outer diameter of the target wheel is greatly reduced, thereby enabling the design of smaller eddy current resolvers and meeting the requirements of product miniaturization design for resolvers.

[0034] Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A target wheel for rotation, characterized in that: It includes a connecting sleeve and multiple wheel pieces, which are circumferentially distributed with gaps between adjacent wheel pieces. The central ends of the multiple wheel pieces are connected to each other, and the outer ends of the multiple wheel pieces are connected to the end face of the connecting sleeve.

2. The target wheel for rotation according to claim 1, characterized in that: The inner wall of the connecting sleeve is provided with at least one limiting groove, which is arranged axially and one end of the limiting groove is connected to the end face of the connecting sleeve.

3. The target wheel for rotation according to claim 1, characterized in that: The outer circumferential surface of the connecting sleeve is provided with a countersunk hole.

4. The target wheel for rotation according to claim 1, characterized in that: The wheel is triangular in shape, with the apexes of the triangles connected to each other. The tail end of the wheel has a bent portion that is connected to the end face of the connecting sleeve.

5. The target wheel for rotation according to claim 4, characterized in that: The connecting sleeve is integrally formed with multiple wheel pieces.

6. The target wheel for rotation according to claim 1, characterized in that: At least one set of locking parts is provided on the connecting sleeve away from the wheel piece, the locking parts being used to lock the target wheel and the load-bearing component.

7. The target wheel for rotation according to claim 6, characterized in that: The snap-fit ​​part includes an elastic arm that connects to the connecting sleeve, and the elastic arm is provided with a snap-fit ​​protrusion.

8. The target wheel for rotation according to claim 6, characterized in that: The snap-fit ​​part includes a snap-fit ​​protrusion on the end face of the connecting sleeve. The other end of the snap-fit ​​protrusion is divided into two elastic parts by a groove, and locking protrusions are provided on the outer surfaces of the two elastic parts respectively.

9. A motor shaft, comprising a shaft body, characterized in that: It also includes the target wheel for rotation as described in any one of claims 1-8, wherein the target wheel for rotation is disposed at one end of the shaft.

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