Electric power steering motor and vehicle

Abstract

The utility model discloses an electric power steering motor and a vehicle. The electric power steering motor comprises a shell, a rotor, a stator and a controller, the shell is provided with an accommodating cavity; the rotor comprises a rotating shaft, a rotor iron core and a magnetic shoe assembly, the rotor iron core is in interference connection with the rotating shaft, and the rotor iron core is rotationally connected to the shell through the rotating shaft in the middle of the accommodating cavity; the magnetic shoe assembly is annularly arranged on the rotor iron core so as to rotate along with the rotor iron core; the stator comprises a stator iron core and a stator winding, the stator iron core is annularly arranged on the side wall of the accommodating cavity, and the stator winding is wound on the stator iron core; wherein the stator winding comprises a first three-phase winding and a second three-phase winding which are arranged in a mutually redundant manner, and a winding wire of the first three-phase winding and a winding wire of the second three-phase winding respectively extend out of the accommodating cavity to be connected with the controller. According to the utility model, the six-phase single motor is formed by the two three-phase windings, so that the occupied space is small, and cooperative operation can be realized; meanwhile, the two three-phase windings are in mutual redundancy configuration, so that the fault tolerance can be effectively improved, and the safety and the stability of the motor are ensured.

Description

Technical Field

[0001] This utility model relates to the field of vehicle structure technology, specifically to an electric power steering motor and a vehicle. Background Technology

[0002] Electric power steering (EPS) is a vehicle steering assistance mechanism that is typically driven by a rotary motor. Traction is achieved through a connected gear, rack, worm gear, worm, or ball screw structure to deflect the steering knuckle and steer the wheels, thereby improving steering efficiency and meeting the steering assistance needs of mid-to-high-end vehicles and new energy vehicles. However, traditional EPS usually only has one steering drive motor. When the motor fails, the vehicle's steering performance will be affected, posing a serious safety hazard.

[0003] To address this issue, related technologies have proposed an electric power steering system with dual motors. This system employs a redundant configuration of a main motor and an auxiliary motor to provide steering assistance, allowing the auxiliary motor to take over in case of a main motor failure. However, arranging two motors not only increases design costs but also occupies additional space. Furthermore, due to the coordination and switching between the two motor systems, there can be a delay in response during the control switching process, which still affects the vehicle's steering safety and stability. Utility Model Content

[0004] In view of the above problems, this utility model provides an electric power steering motor and vehicle, which can improve the performance tolerance of the steering motor and ensure the safety and stability of the vehicle's assisted steering.

[0005] According to one aspect of the present invention, an electric power steering motor is provided, comprising: a housing having a receiving cavity; a rotor including a rotating shaft, a rotor core, and a magnetic tile assembly, the rotor core being interference-connected to the rotating shaft and rotatably connected to the housing via the rotating shaft at the center of the receiving cavity; the magnetic tile assembly being ring-mounted around the rotor core to rotate with the rotor core; a stator including a stator core and a stator winding, the stator core being ring-mounted around the side wall of the receiving cavity, and the stator winding being wound around the stator core; and a controller, the stator winding including a first three-phase winding and a second three-phase winding redundantly arranged, the windings of the first three-phase winding and the windings of the second three-phase winding extending out of the receiving cavity to connect to the controller.

[0006] In an exemplary embodiment of the present invention, the windings of the first three-phase winding and the windings of the second three-phase winding are both led out of the receiving cavity through PIN pins and are symmetrically distributed along the center line of the receiving cavity.

[0007] In an exemplary embodiment of the present invention, a busbar is also included, and the windings of the first three-phase winding and the second three-phase winding are both connected to the PIN pins through the busbar.

[0008] In an exemplary embodiment of the present invention, the housing includes: a shell defining a receiving cavity and having an opening communicating with the receiving cavity at one axial end; and an end cap covering the opening and being detachably fixedly connected to the shell; the end cap having an outlet hole corresponding to the PIN pin.

[0009] In an exemplary embodiment of the present invention, a first bearing and a second bearing are respectively provided at both ends of the rotating shaft, a first bearing chamber is provided in the housing corresponding to the first bearing, and a second bearing chamber is provided in the end cover corresponding to the second bearing; one of the first bearing and the second bearing is riveted to the corresponding bearing chamber, and the other bearing is connected to the corresponding other bearing chamber.

[0010] In an exemplary embodiment of this invention, the magnetic tile assembly is attached to the circumferential outer wall of the rotor core.

[0011] In an exemplary embodiment of the present invention, the magnetic tile assembly is provided in at least two sets, and the at least two sets of magnetic tile assemblies are arranged side by side along the axial direction of the rotor core and staggered in sequence.

[0012] In an exemplary embodiment of this utility model, the housing is made of die-cast aluminum alloy.

[0013] According to a second aspect of the present invention, a vehicle is provided, including any of the above-described electric power steering motors.

[0014] This invention uses redundantly configured dual three-phase windings to form a six-phase single motor. The two three-phase windings can be energized and operate in coordination at the same time. At the same time, when one of the three-phase windings fails and loses control, the other three-phase winding can still enable the motor to output assistance to ensure driving safety. This design offers higher safety and occupies less space than a dual-motor solution.

[0015] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the electric power steering motor according to an embodiment of the present invention is shown;

[0018] Figure 2 This diagram illustrates the structure of the stator within the housing according to an embodiment of the present invention.

[0019] Figure 3 This diagram shows the connection block diagram between the stator winding and the controller according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the rotor structure according to an embodiment of the present invention is shown;

[0021] Figure 5 A schematic diagram of the end cap structure according to an embodiment of the present invention is shown;

[0022] Figure 6 A schematic diagram of the structure of the housing according to an embodiment of the present invention is shown.

[0023] Explanation of icon numbers:

[0024] 1-Housing housing, 11-Shell housing, 111-Accommodating cavity, 112-First bearing chamber, 12-End cover, 121-Lead-out hole, 122-Second bearing chamber

[0025] 2-Rotor, 21-Shaft, 22-Rotor core, 23-Magnetic tile assembly, 24-First bearing, 25-Second bearing

[0026] 3-Stator, 31-Stator core, 32-Stator winding, 321-First three-phase winding, 322-Second three-phase winding, 33-PIN pin.

[0027] 4-Controller, 41-First three-phase bridge drive module, 42-Second three-phase bridge drive module.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0030] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., may be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figures 1 to 4 As shown, this embodiment provides an electric power steering motor, including a housing 1, a rotor 2, a stator 3, and a controller 4. The housing 1 has a receiving cavity 111, with the rotor 2 and stator 3 located inside the receiving cavity 111, while the controller 4 is located outside the receiving cavity 111. The rotor 2 includes a rotating shaft 21, a rotor core 22, and a magnetic tile assembly 23. The rotor core 22 is interference-fitted to the rotating shaft 21 and rotatably connected to the housing 1 via the rotating shaft 21 at the center of the receiving cavity 111. The magnetic tile assembly 23... The stator 3 is encircled by the rotor core 22 and rotates with the rotor core 22. The stator 3 includes a stator core 31 and a stator winding 32. The stator core 31 is encircled by the side wall of the accommodating cavity 111, and the stator winding 32 is wound around the stator core 31. The stator winding 32 includes a first three-phase winding 321 and a second three-phase winding 322 that are redundantly arranged. The windings of the first three-phase winding 321 and the second three-phase winding 322 extend out of the accommodating cavity 111 and are connected to the controller 4. In this way, the six-phase single motor composed of the redundantly configured first three-phase winding 321 and second three-phase winding 322 not only occupies little space, but also allows the two three-phase windings to be energized and work together during motor start-up, acceleration and normal load operation, so that the motor can respond to commands quickly and smoothly. At the same time, when one of the three-phase windings has a fault such as open circuit, short circuit, inter-turn short circuit or overheating, the controller 4 can disconnect the power to isolate the faulty winding, and the other healthy three-phase winding can continue to maintain the operation of the motor, thereby ensuring driving safety.

[0033] It is understandable that the six-phase single motor composed of the first three-phase winding 321 and the second three-phase winding 322 has six phases as follows: Figure 1 and Figure 2The diagram shows phases U1, V1, W1, U2, V2, and W2. The first three-phase winding 321 is composed of phases U1, V1, and W1, and the second three-phase winding 322 is composed of phases U2, V2, and W2. The windings of the first three-phase winding 321 and the second three-phase winding 322 are connected independently at their neutral points, so that the first three-phase winding 321 and the second three-phase winding 322 can be controlled independently without interference. A fault in one winding will not affect the performance of the other winding.

[0034] It is also understandable that, such as Figure 3 As shown, the controller 4 includes an MCU, a first three-phase bridge drive module 41, and a second three-phase bridge drive module 42. The first three-phase bridge drive module 41 and the second three-phase bridge drive module 42 are connected to the first three-phase winding 321 and the second three-phase winding 322, respectively. The controller 4 receives control commands through the built-in microcontroller MCU. These commands include parameters such as vehicle speed, ignition, and torque. The controller 4 can parse the commands and convert them into corresponding electrical signal waveforms to drive the two windings. During operation, the controller 4 monitors the operating status of the two windings in real time and captures abnormal signals through sampling resistors, GDUs, etc., and feeds them back to the microcontroller MCU so that when a winding fails, the power supply to it is stopped. At the same time, the power supply parameters to the healthy winding are adjusted to maintain motor operation and avoid shutdown.

[0035] In some embodiments, such as Figure 1 As shown, the windings of the first three-phase winding 321 and the second three-phase winding 322 are both led out of the receiving cavity 111 through the PIN pin 33. In this way, the positioning of the PIN pin 33 is better than directly leading out the windings, which can reduce the difficulty of connecting and assembling the windings with the controller 4 and is suitable for fully automated production lines. At the same time, the windings of the first three-phase winding 321 and the second three-phase winding 322 are symmetrically distributed along the center line of the receiving cavity 111, which can make the corresponding circuits and integrated components of the controller 4 evenly arranged and the spatial layout reasonable, thereby improving the safety and stability of the overall structure.

[0036] In some embodiments, the electric power steering motor further includes a busbar (not shown), through which the windings of the first three-phase winding 321 and the second three-phase winding 322 are connected to the corresponding current path pins 33. It is understood that the busbar can be made of a highly conductive material such as copper, and designed with a specific shape, such as an arc, according to the motor winding layout. Two busbars can be configured, meaning two independent busbars are provided for each winding, effectively separating the current paths of the two windings. The ends of each winding are connected to the corresponding busbar through welding, riveting, or other processes, and then a unified interface is led out from a specific position on the busbar to connect to the corresponding pin 33. This improves the current carrying capacity of the windings and prevents overheating of the circuit; it also provides stable support for the pins using the strength and rigidity of the busbar, facilitating precise connection to external circuits. It is also understood that in other embodiments, only one busbar can be configured, separating the current paths of the two windings internally, optimizing the space utilization within the motor.

[0037] In some embodiments, such as Figure 1 , Figure 5 and Figure 6 As shown, the housing 1 includes a housing 11 and an end cap 12. The housing 11 defines a receiving cavity 111, and one axial end of the housing 11 has an opening communicating with the receiving cavity 111. The end cap 12 covers the opening and is detachably fixedly connected to the housing 11. The detachable connection method includes, but is not limited to, riveting, snap-fitting, and bolting. At the same time, the end cap 12 has a lead-out hole 121 corresponding to the PIN pin 33. This can ensure the accuracy of the winding lead-out position, thereby reducing assembly errors and improving production efficiency.

[0038] In some embodiments, such as Figures 4 to 6 As shown, the two ends of the rotating shaft 21 are respectively provided with a first bearing 24 and a second bearing 25. The housing 11 is provided with a first bearing chamber 112 corresponding to the first bearing 24, and the end cover 12 is provided with a second bearing chamber 122 corresponding to the second bearing 25. One of the first bearing 24 and the second bearing 25 is riveted to the corresponding bearing chamber, while the other is connected to the corresponding bearing chamber. For example, as... Figures 4 to 6As shown, the inner rings of the first bearing 24 and the second bearing 25 are interference-fitted with the rotating shaft 21 to achieve connection with the rotating shaft 21. Simultaneously, the outer ring of the second bearing 25 is riveted to the second bearing housing 122, and the outer ring of the first bearing 24 is connected to the first bearing housing 112, thus limiting the position of the outer ring of the first bearing 24. By using a dual-bearing configuration, the motor can improve the ease of docking with the lower housing of the externally connected EPS column. Furthermore, the first bearing 24 and the second bearing 25 are connected to the first bearing housing 112 and the second bearing housing 122 with a clearance fit, which can stably confine the rotating shaft 21 in the middle of the housing 11, effectively reducing the risk of vibration or abnormal noise from the rotating shaft 21.

[0039] In some embodiments, such as Figure 4 As shown, the magnetic tile assembly 23 is fixed to the circumferential outer wall of the rotor core 22 by surface mounting. Compared with the embedded fixing method, it is more convenient and less difficult to operate. It can not only achieve a stable connection between the magnetic tile assembly 23 and the rotor core 22, but also achieve better noise control performance under the same control level.

[0040] Understandably, the magnetic tile assembly 23 is surface-mounted onto the circumferential outer wall of the rotor core 22 by punching out the magnetic tile bonding area on the circumferential surface of the rotor core 22 using a high-speed punch press. A high-strength, high-temperature resistant adhesive, such as epoxy glue, is used to bond the corresponding shaped permanent magnet tile to the circumferential surface of the rotor core 22 and then cure it, thereby achieving surface-mounting fixation of the magnetic tile assembly 23.

[0041] In some embodiments, such as Figure 4 As shown, the magnetic tile assembly 23 has at least two sets, which are arranged side by side and staggered sequentially along the axial direction of the rotor core 22. For example, in this embodiment, the magnetic tile assembly 23 has three sets, which are arranged side by side from top to bottom along the axial direction of the rotor core 22 and staggered sequentially at a preset angle in the circumferential direction to form a stepped oblique pole structure. In this way, multiple sets of magnetic tile assemblies 23 can be inclined at a certain angle in the circumferential direction of the rotor core 22, thereby changing the magnetic field distribution and interaction relative to the stator winding 32 during rotation, weakening the cogging torque caused by the cogging effect, and effectively improving motor noise.

[0042] In some embodiments, the housing 1 is made of aluminum alloy die casting, specifically the housing 11 of the housing 1 is made of aluminum alloy in one piece by die casting, which improves the forming accuracy and corrosion resistance of the housing 11; at the same time, the aluminum alloy housing is thicker than the original steel housing, which can improve the noise of the motor operation.

[0043] In another embodiment, a vehicle is also provided, including the electric power steering motor of the above embodiment. For other structures and working principles of the electric power steering motor, please refer to the above description of the embodiments of the electric power steering motor. Since the electric power steering motor has the aforementioned technical effects, the vehicle having this electric power steering motor should also have the corresponding technical effects, which will not be repeated here.

[0044] It is understood that, in this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified. The terms "some embodiments," "exemplarily," etc., 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 this utility model.

[0046] The illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction.

[0047] Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, substitutions and variations to the above embodiments within the scope of the present invention. Therefore, any changes or modifications made in accordance with the claims and description of the present invention should fall within the scope of the patent coverage of the present invention.

Claims

1. An electric power steering motor, characterized in that, include: A housing having a receiving cavity; The rotor includes a rotating shaft, a rotor core, and a magnetic tile assembly. The rotor core is interference-fitted to the rotating shaft and rotatably connected to the housing via the rotating shaft at the center of the receiving cavity. The magnetic tile assembly is arranged around the rotor core to rotate with the rotor core. The stator includes a stator core and a stator winding, wherein the stator core is arranged in a ring around the side wall of the accommodating cavity, and the stator winding is wound around the stator core; and The controller, wherein the stator winding includes a first three-phase winding and a second three-phase winding that are redundantly arranged, the windings of the first three-phase winding and the windings of the second three-phase winding extending out of the accommodating cavity to connect with the controller.

2. The electric power steering motor according to claim 1, characterized in that, The windings of the first three-phase winding and the second three-phase winding are both led out of the accommodating cavity through PIN pins and are symmetrically distributed along the center line of the accommodating cavity.

3. An electric power steering motor according to claim 2, characterized in that, It also includes a busbar, through which the windings of the first three-phase winding and the second three-phase winding are connected to the PIN pin.

4. An electric power steering motor according to claim 3, characterized in that, The housing includes: A housing, defining the receiving cavity, and having an opening at one axial end communicating with the receiving cavity; and An end cap is provided on the opening and is detachably fixed to the housing; the end cap has an outlet hole corresponding to the PIN pin.

5. An electric power steering motor according to claim 4, characterized in that, The two ends of the rotating shaft are respectively provided with a first bearing and a second bearing. The housing is provided with a first bearing chamber corresponding to the first bearing, and the end cover is provided with a second bearing chamber corresponding to the second bearing. One of the first bearing and the second bearing is riveted to the corresponding bearing chamber, and the other bearing is connected to the corresponding other bearing chamber.

6. An electric power steering motor according to any one of claims 1-5, characterized in that, The magnetic tile assembly is attached to the circumferential outer wall of the rotor core.

7. An electric power steering motor according to claim 6, characterized in that, The magnetic tile assembly is provided in at least two sets, and the at least two sets of magnetic tile assemblies are arranged side by side along the axial direction of the rotor core and staggered in sequence.

8. An electric power steering motor according to claim 1, characterized in that, The casing is made of die-cast aluminum alloy.

9. A vehicle, characterized in that, Includes the electric power steering motor as described in any one of claims 1-8.

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