Motor structure and vehicle electric power assisted steering system having the same

Abstract

The utility model discloses a motor structure and vehicle electric power assisted steering system with it relates to motor technical field, including: the pivot, the fixed sleeve, the fixed sleeve downside is provided with the first mounting hole, the pivot upper end is inserted into the first mounting hole, the fixed sleeve upside is provided with the second mounting hole, the hole wall of second mounting hole is non -circular hole wall, the inductive magnet is located in second mounting hole, the lateral wall of inductive magnet is non -circular lateral wall, the outside wall of non -circular lateral wall is stuck up the inside wall of non -circular hole wall, the circuit board is located inductive magnet top, the circuit board downside is provided with sensor, the fixed sleeve is installed in pivot end position, and inductive magnet is not easy to axial deviation on the pivot, and the non -circular lateral wall of inductive magnet and the non -circular hole wall of fixed sleeve correspond with the design of fixed sleeve and ensure that inductive magnet is not easy to rotate and slide deviation on the pivot, so as to guarantee the precision of sensor pivot monitoring.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor structure and a vehicle electric power steering system having the same. Background Technology

[0002] Brushless motors offer high controllability, making them suitable for applications with stringent control requirements, such as the electric power steering (EPS) system in automobiles, where their core function is to provide precise and efficient steering assistance. When a brushless motor operates, the controller needs to accurately control the current phase by reading the rotor's position information. This is achieved by a sensor chip that reads the position changes of a sensing magnetic ring on the rotor. However, in existing systems, the sensing magnetic ring is mounted on the motor rotor and rotates synchronously with it. This process is prone to circumferential slippage between the sensing magnetic ring and the rotor, leading to inaccurate detection. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a motor structure and a vehicle electric power steering system having the same.

[0004] According to a first aspect embodiment of the present invention, a motor structure includes: a rotating shaft extending in a vertical direction; a fixing sleeve connected to the upper end of the rotating shaft, the fixing sleeve having a first mounting hole on its lower side, the upper end of the rotating shaft being inserted into the first mounting hole, the fixing sleeve having a second mounting hole on its upper side, the wall of the second mounting hole being a non-circular hole wall; a sensing magnet located in the second mounting hole, the sidewall of the sensing magnet being a non-circular sidewall, the outer sidewall of the non-circular sidewall being engaged with the inner sidewall of the non-circular hole wall; and a circuit board located above the sensing magnet, with a sensor disposed on the lower side of the circuit board.

[0005] According to some embodiments of the present invention, the non-circular hole wall includes a flower-shaped hole wall portion, the flower-shaped hole wall portion having a concave hole wall portion and a convex hole wall portion, and each of the concave hole wall portions and each of the convex hole wall portions are alternately distributed along the edge line of the horizontal cross section of the non-circular hole wall; the non-circular sidewall includes a flower-shaped sidewall portion, the flower-shaped sidewall portion having a convex sidewall portion and a concave sidewall portion, the convex sidewall portion locking the concave hole wall portion, and the concave sidewall portion locking the convex hole wall portion.

[0006] According to some embodiments of the present invention, the non-circular hole wall further includes a lower hole wall portion, which is located below the flower-shaped hole wall portion. The non-circular sidewall also includes a circular sidewall portion, which is located below the flower-shaped sidewall portion. The outer sidewall of the circular sidewall portion abuts against the inner sidewall of the lower hole wall portion.

[0007] According to some embodiments of the present invention, a supporting step bottom wall is provided on the lower side of the lower hole wall portion, and the upper side of the supporting step bottom wall abuts against the lower side of the induction magnet.

[0008] According to some embodiments of the present invention, a non-circular sidewall step surface is provided between the lower end of the flower-shaped sidewall portion and the upper end of the circular sidewall portion, and the non-circular sidewall step surface is located between adjacent sidewall convex portions; a bottom surface of the hole wall convex portion is provided on the lower side of the hole wall convex portion, and the lower side of the bottom surface of the hole wall convex portion abuts against the upper side of the non-circular sidewall step surface.

[0009] According to some embodiments of the present invention, the inductive magnet includes a plurality of magnetic pole regions, each magnetic pole region including an S pole and an N pole, wherein the horizontally adjacent and / or vertically adjacent S poles and N poles are alternately distributed.

[0010] According to some embodiments of the present invention, the inductive magnet is a horizontal sheet-like structure made of plastic magnet.

[0011] According to some embodiments of the present invention, the upper end of the rotating shaft is provided with a non-circular connecting end, the first mounting hole is a non-circular hole structure, and the non-circular connecting end is inserted into the first mounting hole.

[0012] According to some embodiments of this utility model, it further includes a motor housing, the motor housing having a cavity, an upper end plate and a lower end plate respectively provided on the upper and lower sides of the motor housing, an upper receiving cavity provided on the upper end plate, a lower receiving cavity provided on the lower end plate, the fixing sleeve and the induction magnet being located in the upper receiving cavity, an upper bearing being provided in the upper receiving cavity, a lower bearing being provided in the lower receiving cavity, and the upper bearing and the lower bearing being fitted onto the upper and lower sides of the outer wall of the rotating shaft.

[0013] The motor structure according to the embodiment of this utility model has at least the following technical effects:

[0014] 1. The fixed sleeve is installed at the end of the rotating shaft, so the sensing magnet is not easy to shift axially on the rotating shaft. The non-circular sidewall of the sensing magnet is designed to correspond with the non-circular hole wall of the fixed sleeve to ensure that the sensing magnet is not easy to rotate, slide or shift on the rotating shaft. This ensures the accuracy of the sensor in monitoring the rotating shaft.

[0015] 2. When the induction magnet is installed into the second mounting hole of the fixing sleeve, the bottom surface of the convex part of the hole wall on the second mounting hole can lock the non-circular side wall step surface on the induction magnet. This ensures that the induction magnet is stable enough in the second mounting hole and is not easy to loosen.

[0016] 3. The fixing sleeve serves to fix and protect the inductive magnet, and it can also shield some electromagnetic interference, thus improving detection accuracy.

[0017] The vehicle electric power steering system according to a second aspect embodiment of the present invention includes the motor structure according to the first aspect embodiment of the present invention.

[0018] The electric power steering system for vehicles according to the present invention has at least the following beneficial effects: the fixed sleeve is installed at the end of the shaft, so the sensing magnet is not easy to deviate axially on the shaft. The corresponding design of the non-circular sidewall of the sensing magnet and the non-circular hole wall of the fixed sleeve ensures that the sensing magnet is not easy to rotate, slide or deviate on the shaft. This ensures the accuracy of the sensor's monitoring of the shaft and is conducive to the electric power steering system of the vehicle achieving higher precision power steering control.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a perspective view of the motor structure of this utility model;

[0022] Figure 2 This is an exploded view of the motor structure of this utility model;

[0023] Figure 3 This is a three-dimensional sectional view of the motor structure of this utility model;

[0024] Figure 4 yes Figure 3 A magnified view of a portion of region A in the middle;

[0025] Figure 5 This is a schematic diagram of the working process of this utility model;

[0026] Figure 6 This is a schematic diagram of the assembly of the fixing sleeve and the induction magnet in this utility model;

[0027] Figure 7 This is a schematic diagram of the magnetic pole distribution of the inductive magnet in this utility model;

[0028] Figure 8 This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model;

[0029] Figure 9 This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model;

[0030] Figure 10This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model;

[0031] Figure 11 This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model;

[0032] Figure 12 This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model;

[0033] Figure 13 This is a schematic diagram of the magnetic pole distribution of another embodiment of the inductive magnet in this utility model.

[0034] Figure label:

[0035] 100, rotating shaft, 110, non-circular connecting end, 120, upper bearing, 130, external connecting end; 200, fixing sleeve, 210, first mounting hole, 220, non-circular hole wall, 230, flower-shaped hole wall portion, 231, concave portion of hole wall, 2312, convex portion of hole wall, bottom surface of convex portion of hole wall, 2313, lower hole wall portion, bottom wall of supporting step, 233, first layer of fixing sleeve, 241, second layer of fixing sleeve, 242, third layer of fixing sleeve, 243, first concave arc position of fixing sleeve, 244 1. Fixed sleeve second concave arc position 245, marking position 250; induction magnet 300, non-circular side wall 310, flower-shaped side wall portion 311, side wall convex portion 3111, side wall concave portion 3112, circular side wall portion 312, non-circular side wall stepped surface 313, magnetic pole layer 320, magnetic pole region 321, S pole 322, N pole 323; circuit board 400, sensor 410; motor housing 500, upper end plate 510, upper end accommodating cavity 511, connecting post 512, lower end plate 520, lower end accommodating cavity 521. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "multiple" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] The following is for reference. Figure 1 and Figure 2 The motor structure according to an embodiment of the present utility model is described.

[0041] like Figure 1 and Figure 2 As shown, the motor structure according to an embodiment of the present invention includes a rotating shaft 100, a fixing sleeve 200, an induction magnet 300, and a circuit board 400.

[0042] The rotating shaft 100 extends in the vertical direction; see reference. Figure 3 , Figure 4 A fixing sleeve 200 is connected to the upper end of the rotating shaft 100. A first mounting hole 210 is provided on the lower side of the fixing sleeve 200. The upper end of the rotating shaft 100 is inserted into the first mounting hole 210. A second mounting hole 220 is provided on the upper side of the fixing sleeve 200. The wall of the second mounting hole 220 is a non-circular hole wall 230. The sensing magnet 300 is located in the second mounting hole 220. The side wall of the sensing magnet 300 is a non-circular side wall 310. The outer side wall of the non-circular side wall 310 is stuck against the inner side wall of the non-circular hole wall 230. A circuit board 400 is located above the sensing magnet 300. A sensor 410 is provided on the lower side of the circuit board 400.

[0043] For example, such as Figure 1 and Figure 2 As shown, the rotating shaft 100 is a vertical shaft structure extending in the up-down direction. The rotating shaft 100 serves as the motor shaft and is rotatable. The fixed sleeve 200 is connected to the upper end of the rotating shaft 100 and can also rotate with the rotating shaft 100. (Refer to...) Figure 3 , Figure 4The fixed sleeve 200 has a first mounting hole 210 on its lower side. The upper end of the rotating shaft 100 is inserted into the first mounting hole 210 to fix the fixed sleeve 200 and the rotating shaft 100. The fixed sleeve 200 has a second mounting hole 220 on its upper side. The wall of the second mounting hole 220 is a non-circular hole wall 230. The inductive magnet 300 is located in the second mounting hole 220, and the inductive magnet 300 is fixedly connected to the fixed sleeve 200. The inductive magnet 300 can also rotate with the rotating shaft 100. The side wall of the inductive magnet 300 is a non-circular side wall 310. The outer side wall of the non-circular side wall 310 is engaged with the inner side wall of the non-circular hole wall 230, that is, the non-circular side wall 310 of the inductive magnet 300 corresponds to the non-circular hole wall 230 of the fixed sleeve 200. The circuit board 400 is located above the inductive magnet 300 and does not need to move during operation. A sensor 410 is provided on the lower side of the circuit board 400.

[0044] In practical work, refer to Figure 5 When the rotating shaft 100 of the motor structure of this utility model rotates, the induction magnet 300 on the rotating shaft 100 also rotates together, and the magnetic field generated by the induction magnet 300 changes accordingly. During this process, the circuit board 400 remains stationary, and the sensor 410 can effectively sense the change in the magnetic field signal of the induction magnet 300, which is equivalent to monitoring the rotation of the rotating shaft 100.

[0045] Since the fixed sleeve 200 is installed at the end of the rotating shaft 100, the fixed sleeve 200 and the inductive magnet 300 on the fixed sleeve 200 are less likely to experience axial displacement on the rotating shaft 100. The inductive magnet 300 is installed in the second mounting hole 220 of the fixed sleeve 200, and the non-circular sidewall 310 of the inductive magnet 300 is designed to correspond with the non-circular hole wall 230 of the fixed sleeve 200, ensuring that the inductive magnet 300 is less likely to experience rotational slippage on the rotating shaft 100. This ensures that the synchronous rotation of the inductive magnet 300 and the rotating shaft 100 is sufficiently precise, thereby guaranteeing the accuracy of the sensor 410's monitoring of the rotating shaft 100.

[0046] It must be noted that adjusting the installation angle of the motor structure of this utility model does not affect the implementation effect of the technology.

[0047] In some embodiments of this utility model, reference is made to Figure 4 , Figure 6The non-circular hole wall 230 includes a flower-shaped hole wall portion 231, which has concave portions 2311 and convex portions 2312. The concave portions 2311 and convex portions 2312 are alternately distributed along the edge of the horizontal cross-section of the non-circular hole wall 230, forming a flower-shaped hole. The non-circular sidewall 310 includes a flower-shaped sidewall portion 311, which has convex portions 3111 and concave portions 3112, forming a flower-shaped block. The convex portions 3111 engage the concave portions 2311, and the concave portions 3112 engage the convex portions 2312. This structure ensures that the inductive magnet 300 is more securely and reliably installed into the second mounting hole 220.

[0048] In some embodiments of this utility model, the non-circular hole wall 230 further includes a lower hole wall portion 232, which is located below the flower-shaped hole wall portion 231. The non-circular sidewall 310 further includes a circular sidewall portion 312, which is located below the flower-shaped sidewall portion 311. The outer sidewall of the circular sidewall portion 312 abuts against the inner sidewall of the lower hole wall portion 232. That is, when the inductive magnet 300 is installed into the second mounting hole 220 of the fixing sleeve 200, the upper flower-shaped hole wall portion 231 corresponds to the position of the flower-shaped sidewall portion 311, and the lower hole wall portion 232 corresponds to the position of the circular sidewall portion 312. The hole wall positions between the flower-shaped hole wall portion 231 and the lower hole wall portion 232 form an alternating stepped structure, thus ensuring that the inductive magnet 300 is sufficiently stable and reliable after being installed into the second mounting hole 220.

[0049] In some embodiments of this utility model, the lower hole wall portion 232 has a circular hole wall structure. This design is easy to process and also makes it easier to thicken the induction magnet 300 without increasing costs too much. The induction magnet 300 does not need to thicken the flower-shaped side wall portion 311; instead, it only needs to thicken the relatively simple circular side wall portion 312 to increase the overall thickness.

[0050] In some embodiments of this utility model, a supporting step bottom wall 233 is provided on the lower side of the lower hole wall portion 232. The upper side of the supporting step bottom wall 233 abuts against the lower side of the induction magnet 300. In this way, the second mounting hole 220 can support the lower side of the induction magnet 300, prevent the induction magnet 300 from axially shifting, and further improve the stability of the induction magnet 300.

[0051] In some embodiments of this utility model, a non-circular sidewall step surface 313 is provided between the lower end of the flower-shaped sidewall portion 311 and the upper end of the circular sidewall portion 312, and the non-circular sidewall step surface 313 is located between adjacent sidewall protrusions 3111. A bottom surface 2313 of the hole wall protrusion 2312 is provided on the lower side, and the lower side of the bottom surface 2313 of the hole wall protrusion abuts against the upper side of the non-circular sidewall step surface 313. That is, when the inductive magnet 300 is installed into the second mounting hole 220 of the fixing sleeve 200, the bottom surface 2313 of the hole wall protrusion on the second mounting hole 220 can lock the position of the non-circular sidewall step surface 313 on the inductive magnet 300, thus ensuring that the inductive magnet 300 is sufficiently stable in the second mounting hole 220 and is not easily loosened.

[0052] In some embodiments of this utility model, the fixing sleeve 200 serves to fix and protect the inductive magnet 300, and the fixing sleeve 200 can also shield some electromagnetic interference, thereby improving the detection accuracy.

[0053] In some embodiments of this utility model, the fixing sleeve 200 is made of copper. Copper has self-lubricating properties and sufficient ductility, ensuring the smoothness of pressing the fixing sleeve 200 into the rotating shaft 100, which helps to reduce the complexity of the process.

[0054] In some embodiments of this utility model, the fixing sleeve 200 may also be made of materials such as aluminum or non-magnetic stainless steel.

[0055] In some embodiments of this utility model, the fixing sleeve 200 includes, from top to bottom, a first fixing sleeve layer 241, a second fixing sleeve layer 242, and a third fixing sleeve layer 243. The first fixing sleeve layer 241 corresponds to the position of the flower-shaped hole wall portion 231, and the third fixing sleeve layer 243 corresponds to the position of the first mounting hole 210. The diameter of the first fixing sleeve layer 241 is larger than the diameter of the second fixing sleeve layer 242, and the diameter of the second fixing sleeve layer 242 is larger than the diameter of the third fixing sleeve layer 243. This ensures that the fixing sleeve 200 reliably fixes and protects the inductive magnet 300.

[0056] In some embodiments of this utility model, a first concave arc position 244 is provided on the outer wall between the first layer 241 and the second layer 242 of the fixing sleeve, and a second concave arc position 245 is provided on the outer wall between the second layer 242 and the third layer 243 of the fixing sleeve. This can further improve the structural strength of the fixing sleeve 200, and in particular, prevent cracks from appearing on the outer wall of the fixing sleeve 200 between the first layer 241 and the second layer 242 of the fixing sleeve, and between the second layer 242 and the third layer 243 of the fixing sleeve due to local stress.

[0057] In some embodiments of this utility model, reference is made to Figure 5 , Figure 7 The sensing magnet 300 includes several magnetic pole regions 321, each containing an S pole 322 and an N pole 323. Horizontally adjacent and / or vertically adjacent S poles 322 and N poles 323 are interleaved. This interleaved arrangement of the N and S poles of adjacent magnetic pole regions 321 allows the magnetic fields of the multiple magnetic pole regions 321 on the sensing magnet 300 to form a more uniformly distributed cyclic magnetic field. This design allows multiple sets of magnetic pole regions 321 on the sensing magnet 300 to generate a cyclic magnetic field, making it easier for the sensor 410 to detect the magnetic field of the sensing magnet 300.

[0058] In some embodiments of this utility model, the inductive magnet 300 includes several layers of magnetic pole layers 320, each layer including several layers of magnetic pole regions 321. Each magnetic pole region 321 includes S poles 322 and N poles 323. Horizontally adjacent S poles 322 and N poles 323 are alternately distributed, as are vertically adjacent S poles 322 and N poles 323. Specifically, the magnetic pole regions 321 can be divided in various ways, for example, referring to... Figures 8-10 The interface shapes of each magnetic pole region 321 can vary, and the shape of the induction magnet 300 can also vary, but the specific method does not affect its technical effect.

[0059] In some embodiments of this utility model, a marking position 250 is provided on the outer wall of the fixing sleeve 200 to facilitate visual identification of the orientation of the fixing sleeve 200 during installation, and thus the orientation of the induction magnet 300 on the fixing sleeve 200. The marking position 250 may be a groove, engraving, or other similar marking structure.

[0060] In some embodiments of this utility model, the induction magnet 300 is a horizontal sheet structure made of plastic magnet to ensure that the molding of the induction magnet 300 meets the requirements.

[0061] In some embodiments of this utility model, reference is made to Figure 2 , Figure 3 The upper end of the rotating shaft 100 is provided with a non-circular connecting end 110, and the first mounting hole 210 is a non-circular hole structure. The non-circular connecting end 110 is inserted into the first mounting hole 210. This ensures that when the rotating shaft 100 rotates, the fixed sleeve 200 also rotates synchronously.

[0062] In some embodiments of this utility model, adhesive is applied between the fixing sleeve 200 and the rotating shaft 100 to fix the induction magnet 300.

[0063] In some embodiments of this utility model, the fixing sleeve 200 and the rotating shaft 100 are radially riveted together to fix the induction magnet 300.

[0064] In some embodiments of this utility model, the fixing sleeve 200 and the rotating shaft 100 are fixed with screws, thereby fixing the induction magnet 300.

[0065] In some embodiments of this utility model, the lower end of the rotating shaft 100 is used as an external terminal 140, which serves as the output terminal of the rotating shaft 100 and also as the power output terminal of the motor structure of this utility model.

[0066] In some embodiments of this utility model, reference is made to Figure 1 , Figure 2 The motor structure of this utility model also includes a motor housing 500, which has a cavity. An upper end plate 510 and a lower end plate 520 are respectively provided on the upper and lower sides of the motor housing 500. An upper end receiving cavity 511 is provided on the upper end plate 510, and a lower end receiving cavity 521 is provided on the lower end plate 520. The fixing sleeve 200 and the induction magnet 300 are located in the upper end receiving cavity 511. An upper end bearing 120 is also provided in the upper end receiving cavity 511, and a lower end bearing 130 is provided in the lower end receiving cavity 521. The upper end bearing 120 and the lower end bearing 130 are fitted onto the upper and lower sides of the outer wall of the rotating shaft 100.

[0067] In some embodiments of this utility model, a connecting post 512 is provided on the upper end plate 510, and the circuit board 400 is connected to the connecting post 512. This facilitates the fixing of the circuit board 400 to the motor housing 500.

[0068] In some embodiments of this utility model, the circuit board 400 has a magnetic encoder, a magnetic induction chip, and is horizontally mounted, so that the magnetic induction chip can sense a more uniform magnetic field.

[0069] In some embodiments of this invention, sensor 410 may be a Hall sensor.

[0070] The vehicle electric power steering system according to a second aspect embodiment of the present invention includes the motor structure according to the first aspect embodiment of the present invention.

[0071] The electric power steering system of this invention can receive signals from the vehicle's torque sensor and speed sensor, and adjust the power assist in real time. For example, at low speeds (such as when parking), the motor structure of this invention outputs a larger torque, making steering easier; at high speeds, the motor structure of this invention reduces power assist to enhance the "road feel" of the steering wheel, improve handling stability, and enhance the user experience.

[0072] The motor structure of this utility model achieves high-precision control, which is beneficial for lane keeping assist and automatic parking. It can work in conjunction with ADAS systems to finely adjust the steering angle in real time.

[0073] Other components and operations of the vehicle electric power steering system according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0074] The following is for reference. Figure 1 and Figure 2 The motor structure according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0075] like Figure 1 and Figure 2 As shown, the motor structure of this utility model embodiment includes a rotating shaft 100, a fixing sleeve 200, an induction magnet 300, a circuit board 400, and a motor housing 500.

[0076] The motor housing 500 includes an upper end plate 510, an upper accommodating cavity 511, a connecting post 512, a lower end plate 520, and a lower accommodating cavity 521. The rotating shaft 100, the fixing sleeve 200, and the induction magnet 300 are located inside the motor housing 500. A stator is also provided inside the motor housing 500.

[0077] The rotating shaft 100 includes a non-circular connecting end 110, an upper bearing 120, a lower bearing 130, and an external connecting end 140.

[0078] The fixing sleeve 200 is located on the non-circular connecting end 110. The fixing sleeve 200 includes a first mounting hole 210, a second mounting hole 220, a non-circular hole wall 230, a flower-shaped hole wall portion 231, a concave portion 2311, a convex portion 2312, a bottom surface 2313 of the convex portion 2313, a lower hole wall portion 232, a support step bottom wall 233, a first layer 241 of the fixing sleeve, a second layer 242 of the fixing sleeve, a third layer 243 of the fixing sleeve, a first concave arc position 244 of the fixing sleeve, a second concave arc position 245 of the fixing sleeve, and a marking position 250.

[0079] The induction magnet 300 is installed in the second mounting hole 220. The induction magnet 300 includes a non-circular sidewall 310, a flower-shaped sidewall portion 311, a convex sidewall portion 3111, a concave sidewall portion 3112, a circular sidewall portion 312, a non-circular sidewall stepped surface 313, a magnetic pole layer 320, a magnetic pole region 321, an S pole 322, and an N pole 323.

[0080] Circuit board 400 is located on motor housing 500. Sensor 410 is installed on circuit board 400.

[0081] According to the motor structure of this utility model embodiment, by such arrangement, at least the following effects can be achieved: the fixed sleeve 200 is installed at the end of the rotating shaft 100, and the fixed sleeve 200 and the induction magnet 300 on the fixed sleeve 200 are not prone to axial displacement on the rotating shaft 100; the induction magnet 300 is installed in the second mounting hole 220 of the fixed sleeve 200, and the non-circular sidewall 310 of the induction magnet 300 is designed to correspond with the non-circular hole wall 230 of the fixed sleeve 200, which can ensure that the induction magnet 300 is not prone to rotational sliding displacement on the rotating shaft 100, thus ensuring the accuracy of the sensor 410 in monitoring the rotating shaft 100; when the rotating shaft 100 rotates, the induction magnet 300 on the rotating shaft 100 also rotates together, and the magnetic field generated by the induction magnet 300 changes accordingly. The sensor 410 can effectively sense the change in the magnetic field signal of the induction magnet 300, thereby monitoring the rotation of the rotating shaft 100.

[0082] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A motor structure, characterized in that, include: The pivot (100) extends along the vertical direction; A fixing sleeve (200) is connected to the upper end of the rotating shaft (100). A first mounting hole (210) is provided on the lower side of the fixing sleeve (200). The upper end of the rotating shaft (100) is inserted into the first mounting hole (210). A second mounting hole (220) is provided on the upper side of the fixing sleeve (200). The wall of the second mounting hole (220) is a non-circular hole wall (230). The induction magnet (300) is located in the second mounting hole (220). The sidewall of the induction magnet (300) is a non-circular sidewall (310). The outer sidewall of the non-circular sidewall (310) is stuck to the inner sidewall of the non-circular hole wall (230). A circuit board (400) is located above the inductive magnet (300), and a sensor (410) is provided on the lower side of the circuit board (400).

2. The motor structure according to claim 1, characterized in that, The non-circular hole wall (230) includes a flower-shaped hole wall portion (231), which has a concave hole wall portion (2311) and a convex hole wall portion (2312). Each of the concave hole wall portions (2311) and each of the convex hole wall portions (2312) are alternately distributed along the edge line of the horizontal section of the non-circular hole wall (230). The non-circular sidewall (310) includes a flower-shaped sidewall portion (311), which has a convex sidewall portion (3111) and a concave sidewall portion (3112). The convex sidewall portion (3111) engages the concave hole portion (2311), and the concave sidewall portion (3112) engages the convex hole portion (2312).

3. The motor structure according to claim 2, characterized in that, The non-circular hole wall (230) also includes a lower hole wall portion (232), which is located below the flower-shaped hole wall portion (231). The non-circular sidewall (310) also includes a circular sidewall portion (312), which is located below the flower-shaped sidewall portion (311). The outer sidewall of the circular sidewall portion (312) abuts against the inner sidewall of the lower hole wall portion (232).

4. The motor structure according to claim 3, characterized in that, The lower hole wall portion (232) is provided with a supporting step bottom wall (233) on the lower side, and the upper side of the supporting step bottom wall (233) abuts against the lower side of the induction magnet (300).

5. The motor structure according to claim 3, characterized in that, A non-circular sidewall step surface (313) is provided between the lower end of the flower-shaped sidewall portion (311) and the upper end of the circular sidewall portion (312), and the non-circular sidewall step surface (313) is located between adjacent sidewall convex portions (3111). The bottom surface (2313) of the convex portion (2312) of the hole wall is provided on the lower side, and the lower side of the bottom surface (2313) of the convex portion of the hole wall abuts against the upper side of the non-circular side wall step surface (313).

6. The motor structure according to claim 1, characterized in that, The inductive magnet (300) includes a plurality of magnetic pole regions (321), each magnetic pole region (321) including an S pole (322) and an N pole (323), with the S poles (322) and the N poles (323) being horizontally adjacent and / or vertically adjacent and interleaved.

7. The motor structure according to claim 1, characterized in that, The inductive magnet (300) is a horizontal sheet structure made of plastic magnet.

8. The motor structure according to claim 1, characterized in that, The upper end of the rotating shaft (100) is provided with a non-circular connecting end (110), and the first mounting hole (210) is a non-circular hole structure. The non-circular connecting end (110) is inserted into the first mounting hole (210).

9. The motor structure according to claim 1, characterized in that, It also includes a motor housing (500), which has a cavity. An upper end plate (510) and a lower end plate (520) are respectively provided on the upper and lower sides of the motor housing (500). An upper end receiving cavity (511) is provided on the upper end plate (510), and a lower end receiving cavity (521) is provided on the lower end plate (520). The fixing sleeve (200) and the induction magnet (300) are located in the upper end receiving cavity (511). An upper end bearing (120) is also provided in the upper end receiving cavity (511), and a lower end bearing (130) is provided in the lower end receiving cavity (521). The upper end bearing (120) and the lower end bearing (130) are fitted on the upper and lower sides of the outer wall of the rotating shaft (100).

10. A vehicle electric power steering system, characterized in that, Includes the motor structure according to any one of claims 1 to 9.

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