Motor for electronic hydraulic brake system

Abstract

The invention discloses a motor for an electronic hydraulic brake system. The motor comprises a stator assembly and a rotor assembly, a stator iron core in the stator assembly is fixedly arranged on the inner circumference of the motor shell; the stator framework is mounted at the axial end part of the stator iron core; the magnet exciting coil is wound on the stator framework; the motor coil holder assembly is electrically connected with the excitation coil and is fixed on the stator framework; the power supply connector is arranged in the motor shell and is electrically connected with the motor coil holder assembly; the bearing ring is fixed at the axial end part in the motor shell, and the bearing is arranged in the bearing ring; the power supply connector comprises three power supply terminals which are fixed and insulated through insert injection molding parts respectively; the motor coil holder assembly comprises a coil holder main body and three wire-to-board connecting terminals, the three wire-to-board connecting terminals are fixed and insulated through the coil holder main body, the three power supply terminals coated in the insert injection molding part are arranged on the coil holder main body, and the three wire-to-board connecting terminals are respectively connected with one ends of the three power supply terminals.

Description

Technical Field

[0001] This application relates to the field of automotive braking system technology, and more specifically, to a motor for an electro-hydraulic braking system. Background Technology

[0002] Electro-hydraulic braking systems (EHB) are key actuators in modern automobiles, especially electric and autonomous vehicles. They achieve precise and rapid braking of the wheels by using an electric motor to drive a hydraulic unit. As the core power source of the EHB system, the performance, reliability, and cost of the drive motor are of paramount importance.

[0003] The existing EHB motors mainly have the following problems: First, the electrical connections are complex and costly: Traditional busbars often use integral injection molding or semi-circular large-span designs, resulting in complex molds, large amounts of copper, and high costs. The numerous connection points between the coil and the busbar lead to messy wiring, affecting insulation reliability and production efficiency.

[0004] Second, insufficient connection reliability: the connection method between the power connector and the internal conductive path (such as direct welding) is prone to failure in vibration environment, and the Busbar assembly is not firmly fixed on the stator, which poses a risk of loosening.

[0005] Third, the sealing performance needs to be improved: the poor sealing structure design of the power connector and the external valve block interface may lead to the intrusion of water vapor and impurities, affecting the motor's lifespan and safety.

[0006] Fourth, the rotor structure has poor manufacturability: the magnetic tile fixing method is complicated, the hollow shaft needs to be milled into multiple planes, the processing efficiency is low, the cost is high, and the dynamic balance accuracy is difficult to guarantee, which affects the NVH performance of the motor.

[0007] Fifth, low space utilization: Unnecessary reserved space inside the casing results in an excessively large motor size and weight, which does not meet the requirements for compact and lightweight automotive parts.

[0008] Therefore, there is an urgent need for an EHB motor that is highly integrated, has reliable connections, optimized cost, and a compact structure. Summary of the Invention

[0009] This application addresses the shortcomings of existing technologies by providing a motor for an electro-hydraulic braking system, which achieves high reliability, low cost, and small size by optimizing electrical connections, rotor structure, and sealing design.

[0010] The specific technical solution is as follows: This application provides a motor for an electro-hydraulic braking system, comprising: A stator assembly includes a motor housing, a stator core, a stator frame, an excitation coil, a motor wire frame assembly, a power connector, bearings, and bearing races. The stator core is fixedly disposed on the inner circumference of the motor housing. The stator frame is mounted on the axial end of the stator core. The excitation coil is wound around the stator frame. The motor wire frame assembly is electrically connected to the excitation coil and fixed to the stator frame. The power connector is disposed inside the motor housing and electrically connected to the motor wire frame assembly. The bearing races are fixed to a shaft inside the motor housing. At the end, the bearing is installed inside the bearing race; wherein, the power connector includes three power terminals, which are respectively fixed and insulated by insert injection molding parts; the motor wire frame assembly includes a wire frame body and three wire pair plate connection terminals, the three wire pair plate connection terminals are fixed and insulated by the wire frame body, and the three power terminals encapsulated in the insert injection molding parts are disposed on the wire frame body, the three wire pair plate connection terminals are respectively connected to one end of the three power terminals, and the other end of the three power terminals are connected to the excitation coil; The rotor assembly includes a hollow shaft, a magnetic tile, a magnetic tile support, a rotor steel sleeve, and a yoke. The magnetic tile support is fixedly sleeved on the outer periphery of the hollow shaft, the yoke is fixedly installed on the outside of the magnetic tile support, the magnetic tile is fixedly attached to the outer surface of the yoke, and the rotor steel sleeve is fixedly sleeved on the outer periphery of the magnetic tile for fixing and protecting the magnetic tile.

[0011] In some embodiments of this application, the wire-to-board connection terminal is a standard 250 series female terminal.

[0012] In some embodiments of this application, the motor wire frame assembly is interference-fitted with the motor stator frame, and the wire frame body is provided with a slot, while the motor stator frame is provided with a barb structure that engages with the three slots.

[0013] In some embodiments of this application, an O-ring is provided at the interface between the power connector and the valve block, and an annular groove is provided on the outer wall of the insert injection molded part, and the O-ring is embedded in the annular groove.

[0014] In some embodiments of this application, the connection between the line-to-plate connection terminal and the excitation coil adopts a delta connection. Each phase winding of the excitation coil consists of four coils connected in series, and each phase winding has two wire ends, which are connected to the corresponding line-to-plate connection terminal.

[0015] In some embodiments of this application, the two ends of the V-phase line are located in the first stator slot, and the distance between the stator slots where the two ends of the W-phase line and the U-phase line are located and the first stator slot does not exceed 3 slot pitches.

[0016] In some embodiments of this application, the main body of the wire frame includes a main wire frame and a wire frame cover plate. Three wire-to-board connecting terminals are fixed on the main wire frame, and the wire frame cover plate is installed on the main wire frame to form three fixing slots. The power terminals encapsulated in the insert injection molded part are fixed in the fixing slots.

[0017] In some embodiments of this application, the main frame and the frame cover are both formed by injection molding, and the wire-to-plate connection terminals are formed by stamping.

[0018] In some embodiments of this application, a radial O-ring seal is used between the motor housing and the valve block, a radial O-ring seal is used at the bottom of the motor housing, and the stator assembly and the rotor assembly are filled in the inner cavity of the motor housing in a gapless manner; the outer contour of the stator assembly is adapted to the shape of the inner wall of the motor housing, and the gap between the two is less than a preset threshold.

[0019] In some embodiments of this application, the stator core is T-shaped and there are 12 of them; the number of magnetic tiles is 10.

[0020] The beneficial effects of the embodiments of this application are as follows: This application modularly integrates the motor wireframe assembly and the power connector, and uses a standard 250 female terminal to achieve plug-in connection between the wireframe assembly and the power connector, replacing the traditional direct welding. This results in a reliable connection, vibration resistance, and easy assembly. Furthermore, the wireframe assembly is doubly secured through interference fit and barbed slots, eliminating the risk of loosening. Its power connector interface uses a standard O-ring seal, which is simple in structure, provides a reliable seal, effectively prevents external media intrusion, and exhibits excellent sealing performance.

[0021] Furthermore, this application optimizes the electromagnetic design and wiring. The excitation coils adopt a delta connection and are all connected in series, reducing the number from 12 to 6, significantly reducing the number of wire ends. A specific wire end arrangement scheme with the V phase centered and the U / W phases distributed nearby is used, making the wiring simpler and more compact, improving insulation reliability and space utilization. The stator and rotor assemblies are filled into the housing without gaps, achieving extreme compactness and lightweighting of the motor, meeting the stringent installation space requirements of the EHB system, and making the overall structure more compact. Meanwhile, the main body and cover plate of the wire frame in this application are injection molded, the terminals are stamped, and the magnets are fixed by injection-molded brackets, resulting in good manufacturability and low cost. The use of standard terminals further reduces costs. In addition, the magnets in this application are firmly clamped to the magnet bracket by the Yoke and rotor steel sleeve, ensuring structural stability. The injection molding process of the magnet bracket eliminates the milling process of the hollow shaft, simplifying processing, improving production efficiency, and ensuring good dynamic balance performance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A first-view structural schematic diagram of a stator assembly in an electric motor for an electro-hydraulic braking system provided in this application embodiment; Figure 2 A second-view structural schematic diagram of a stator assembly in an electric motor for an electro-hydraulic braking system, provided as an embodiment of this application; Figure 3 A schematic diagram of the overall structure of the motor housing in an electric motor used in an electro-hydraulic braking system, provided in an embodiment of this application; Figure 4 An exploded view of a stator assembly in an electric motor for an electro-hydraulic braking system, provided as an embodiment of this application; Figure 5 An exploded schematic diagram of the motor stator in an electric motor used in an electro-hydraulic braking system, provided as an embodiment of this application; Figure 6 The excitation coil winding and wiring diagram provided for embodiments of this application; Figure 7 A schematic diagram of the rotor assembly in a motor for an electro-hydraulic braking system is provided as an embodiment of this application. Figure 8 An exploded view of the rotor assembly in a motor used in an electro-hydraulic braking system, provided as an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0026] like Figure 1 – Figure 8 As shown in the figure, this application discloses a motor for an electro-hydraulic braking system, which mainly includes a stator assembly 1 and a rotor assembly 10.

[0027] Specifically, the stator assembly 1 includes a motor housing, a stator core 2, a stator frame 3, an excitation coil 4, a motor wire frame assembly, a power connector, a bearing 5, and a bearing ring 6. The stator core 2 is fixedly disposed on the inner circumference of the motor housing. The stator frame 3 is mounted on the axial end of the stator core 2. The excitation coil 4 is wound on the stator frame 3. The motor wire frame assembly is electrically connected to the excitation coil 4 and fixed to the stator frame 3. The power connector is disposed inside the motor housing and electrically connected to the motor wire frame assembly. The bearing ring 6 is fixed to the axial end inside the motor housing, and the bearing 5 is installed inside the bearing ring 6. The stator core 2 is T-shaped, and there are 12 of them. The number of magnets 12 is 10 pieces. The rotor assembly 10 includes a hollow shaft 11, magnets 12, magnet brackets 13, a rotor steel sleeve 14, and yokes 15. The magnet bracket 13 is fixedly fitted around the outer periphery of the hollow shaft 11, the yokes 15 are fixedly installed on the outside of the magnet bracket 13, the magnets 12 are fixedly attached to the outer surface of the yokes 15, and the rotor steel sleeve 14 is fixedly fitted around the outer periphery of the magnets 12 for fixing and protecting them. The 10 magnets 12 that mate with the hollow shaft 11 are tile-shaped, while the hollow shaft 11 is a simple cylinder, requiring only a simple injection-molded magnet bracket 13 for fixation and support. No internal space is reserved in the motor, and the height of the yokes 15 is correspondingly reduced. The hollow shaft 11 and yokes 15 are connected by an interference fit. This rotor assembly 10 undergoes a dynamic balancing process, achieving a dynamic balance level of G2.5, significantly improving its NVH performance.

[0028] In this embodiment, the power connector includes three power terminals 7, which are fixed and insulated by insert injection molding parts 8. The motor wire frame assembly includes a wire frame body and three wire-to-board connection terminals 9. The three wire-to-board connection terminals 9 are fixed and insulated by the wire frame body, and the three power terminals 7, encased in the insert injection molding parts 8, are disposed on the wire frame body. The three wire-to-board connection terminals 9 are connected to one end of the three power terminals 7, and the other end of the three power terminals 7 is connected to the excitation coil 4. Furthermore, the wire-to-board connection terminals 9 are standard 250 series female terminals. Since they are standard parts, they can be used in large quantities, resulting in low cost. The six wire ends of the motor stator 19 and the standard 250 series female terminals are resistance welded, a mature and low-cost process. The power connector 2 and the standard 250 series female terminals are connected by a simple plug-in method, resulting in high production efficiency and low cost.

[0029] In some embodiments, the motor wire frame assembly is interference-fitted with the motor stator frame 3, and the wire frame body is provided with slots. The motor stator frame 3 is provided with a barb structure that engages with the three slots, and the barb structure is elastic. During assembly, pressure is applied to make the motor wire frame assembly and the motor stator frame 3 interference-fitted, and at the same time, the elastic barb structure deforms and engages in the slots, forming a double safety against loosening and achieving bidirectional locking.

[0030] In other embodiments, an O-ring is provided at the interface between the power connector and the valve block, and an annular groove is formed on the outer wall of the insert injection molded part 8, into which the O-ring is fitted. When the power connector is installed on the valve block, the O-ring 10 is compressed, achieving a reliable static radial seal between the two.

[0031] In terms of electrical connection, the connection between the line-pair plate connection terminal 9 and the excitation coil 4 adopts a delta connection. Each phase winding of the excitation coil 4 consists of four coils connected in series, and each phase winding has two wire ends, which are connected to the corresponding line-pair plate connection terminal 9. Furthermore, the two wire ends of the V-phase line are located in the first stator slot, and the distance between the stator slot containing the two wire ends of the W-phase line and the U-phase line, respectively, and the first stator slot does not exceed three slot pitches. That is to say, The excitation coil 4 and the wire pair plate connection terminal 9 are connected in a delta configuration. Each phase winding consists of four coils connected in series, with only two wire ends led out. The two wire ends of the V-phase line are placed in the same stator slot, while the wire ends of the U-phase and W-phase lines are respectively arranged in slots no more than three slot distances to the left and right of the slot where the V-phase line wire end is located. This design allows the other four wire ends to be easily fixed and routed to adjacent positions to the left and right of the V-phase line. Figure 6As shown, the coil utilizes the stator frame 3 structure and employs an external wiring method, which improves its insulation and high-voltage withstand capability. These six wire ends are ultimately connected to the three wire-pair board connection terminals 9 via resistance welding, resulting in a simple and compact wiring method while also enhancing insulation reliability.

[0032] In some specific embodiments, the main body of the cable tray includes a main cable tray 16 and a cable tray cover plate 17. Three wire-to-board connecting terminals 9 are fixed to the main cable tray 16, and the cable tray cover plate 17 is installed on the main cable tray 16, together forming three fixing slots. The power terminals 7, encapsulated in the insert injection molded part 8, are fixed in the fixing slots. Furthermore, both the main cable tray 16 and the cable tray cover plate 17 are formed by injection molding, and the wire-to-board connecting terminals 9 are formed by stamping.

[0033] In some specific embodiments, the motor housing includes a housing body 18, which is a cylindrical structure with one end open, and both the open end and the bottom are sealed with an O-ring radial sealing structure.

[0034] Specifically, the open end of the housing body 18 is used to mate with the hydraulic valve block of the EHB system. An annular first sealing groove 20 is machined on the open end face. The first sealing groove 20 has a rectangular cross-section and includes a first bottom wall and a first and a second side wall extending from the first bottom wall. The first side wall is the inner ring side wall, close to the central axis of the housing body 18, and the second side wall is the outer ring side wall, away from the central axis of the housing body 18. The height of the first side wall is greater than the height of the second side wall, forming an asymmetrical structure. This design facilitates demolding during die casting and optimizes the compression deformation behavior of the O-ring. Furthermore, this structure replaces the cylindrical shape required by the prior art where the valve block must protrude due to radial sealing requirements, greatly simplifying the valve block structure and reducing material and machining costs. During assembly, the O-ring is placed within the first sealing groove 20. When the valve body and the open end of the housing body 18 are tightened by bolts, the O-ring is axially compressed, achieving a reliable axial static seal between the housing body 18 and the valve body. In the specific implementation process, three mounting ears 25 are provided at equal intervals along the circumference at the open end of the housing body 18 to realize the bolt connection between the motor housing and the valve body.

[0035] A cylindrical protrusion 22 extends outward from the center of the closed end of the housing body 18. This cylindrical protrusion 22 has a through hole 23 along its axis (i.e., at its center). Simultaneously, a second sealing groove 24 is formed on the end face of the cylindrical protrusion 22. An O-ring is placed within the second sealing groove 24 to achieve axial sealing. More specifically, the second sealing groove 24 has a second bottom wall and third and fourth side walls extending from the second bottom wall. The third side wall is an inner ring side wall, close to the central axis of the housing body 18 and surrounding the through hole 23. The fourth side wall is an outer ring side wall, away from the central axis of the housing body 18. When the through hole 23 is connected to an external component, and an O-ring is placed within the second sealing groove 24, an axial seal is achieved between the housing body 18 and the external component (such as an external end cap or connector). That is, the external sealing end cap or connector covers the end face of the cylindrical protrusion 22, and an axial seal is achieved through the O-ring placed within the second sealing groove 24.

[0036] In some specific embodiments, at least one sidewall (such as the fourth sidewall) of the second sealing groove 24 is plastically deformed inward by a riveting process to form a constricted structure for clamping the external connector. This constricted structure presses the external connector tightly against the O-ring seal inside the second sealing groove 24, achieving screwless fixing, simplifying assembly, making assembly quick, and reducing costs.

[0037] To achieve an extremely compact overall motor structure, the motor rotor and stator 19 are tightly packed within the inner cavity of the housing body 18 without any gaps, maximizing the use of internal space and achieving miniaturization of the housing. Furthermore, the outer contour of the motor stator 19 is adapted to the shape of the inner wall of the housing body 18, and the gap between them is less than a preset threshold to ensure good heat conduction and mechanical stability. That is, the outer circle of the motor stator 19 and the inner wall of the housing body 18 adopt an interference fit or a small clearance transition fit to ensure a compact structure and good heat dissipation.

[0038] In other specific embodiments, a plurality of reinforcing ribs 21 are provided at the bottom of the inner cavity of the housing body 18 to compensate for the possible decrease in rigidity due to structural compactness and to enhance the rigidity of the bottom of the housing. Furthermore, the reinforcing ribs 21 are arranged radially, and both ends of each reinforcing rib 21 are connected to the inner wall of the housing body 18 and the through hole 23, respectively, forming an efficient force transmission path. In specific implementations, the number of reinforcing ribs 21 is 6 to 8, achieving an optimal balance between ensuring structural strength and casting processability.

[0039] In a specific implementation process, the housing body 18 is die-cast from aluminum alloy material, and the reinforcing rib 21 is integrally die-cast with the housing body 18. Its inner end is connected to the outer wall of the through hole 23, and its outer end is connected to the inner side wall of the housing body 18, forming an efficient reinforcing structure, which significantly improves the deformation resistance of the bottom of the housing and ensures the overall structural strength and production efficiency.

[0040] The EHB motor housing in this application features a gapless filling layout internally, coupled with radially integrated reinforcing ribs at the bottom, achieving both compactness and lightweight design while maintaining the housing's rigidity and strength. This housing is particularly suitable for space- and cost-sensitive automotive brake-by-wire systems.

[0041] In this embodiment, the EHB motor housing employs a dual axial seal. Axial sealing structures are used between the motor housing and the valve block, as well as at the bottom of the housing. This avoids the need for complex cylindrical protrusions on the valve block, greatly simplifying the valve block structure and reducing material and machining costs. Furthermore, the bottom seal eliminates the need for additional end caps and screws, further reducing costs and increasing efficiency. The "gap-free filling" internal layout significantly reduces the internal reserved space of the housing, lowering its overall height and volume, resulting in a compact structure that saves material while reducing weight. Additionally, the sealing structure at the bottom of the housing can be plastically deformed to form a narrowing, achieving a screwless connection. This not only ensures reliable connection but also simplifies the assembly process and improves production efficiency. Despite its compact structure, the radially integrated reinforcing ribs at the bottom of the housing cavity effectively enhance the overall rigidity and strength of the housing, reliably withstanding various stresses during operation and ensuring long-term stable motor operation. The overall structure of the motor housing in this application is suitable for die casting, with the reinforcing ribs cast integrally with the body, resulting in high production efficiency and material utilization, exhibiting excellent processability and economic benefits.

[0042] In summary, this application discloses a motor for an electro-hydraulic braking system, which modularly integrates the motor wire frame assembly and the power connector. The connection between the wire frame assembly and the power connector is achieved through a standard 250 female terminal, replacing traditional direct welding. This results in a reliable connection, vibration resistance, and easy assembly. Furthermore, the wire frame assembly is doubly secured through interference fit and barbed groove, eliminating the risk of loosening. The power connector interface uses a standard O-ring seal, which is simple in structure, provides a reliable seal, effectively prevents external media intrusion, and exhibits excellent sealing performance.

[0043] Furthermore, this application optimizes the electromagnetic design and wiring. The excitation coils adopt a delta connection and are all connected in series, reducing the number from 12 to 6, significantly reducing the number of wire ends. A specific wire end arrangement scheme with the V phase centered and the U / W phases distributed nearby is used, making the wiring simpler and more compact, improving insulation reliability and space utilization. The stator and rotor assemblies are filled into the housing without gaps, achieving extreme compactness and lightweighting of the motor, meeting the stringent installation space requirements of the EHB system, and making the overall structure more compact. Meanwhile, the main body and cover plate of the wire frame in this application are injection molded, the terminals are stamped, and the magnets are fixed by injection-molded brackets, resulting in good manufacturability and low cost. The use of standard terminals further reduces costs. In addition, the magnets in this application are firmly clamped to the magnet bracket by the Yoke and rotor steel sleeve, ensuring structural stability. The injection molding process of the magnet bracket eliminates the milling process of the hollow shaft, simplifying processing, improving production efficiency, and ensuring good dynamic balance performance.

[0044] It will be understood by those skilled in the art that the accompanying drawings are merely schematic diagrams of one embodiment, and the components shown in the drawings are not necessarily essential for implementing the invention. It should also be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component 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 the invention.

[0046] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. Their protection scope is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope described in the claims.

Claims

1. A motor for an electro-hydraulic braking system, characterized in that, include: Stator assembly, including motor housing, stator core, stator frame, excitation coil, motor wire frame assembly, power connector, bearing and bearing race; The stator core is fixedly disposed on the inner circumference of the motor housing; the stator frame is installed on the axial end of the stator core; the excitation coil is wound on the stator frame; the motor wire frame assembly is electrically connected to the excitation coil and fixed on the stator frame; the power connector is disposed inside the motor housing and electrically connected to the motor wire frame assembly; the bearing ring is fixed to the axial end inside the motor housing, and the bearing is installed inside the bearing ring; wherein, the power connector includes three power terminals, which are fixed and insulated by insert injection molding parts respectively; the motor wire frame assembly includes a wire frame body and three wire pair plate connection terminals, the three wire pair plate connection terminals are fixed and insulated by the wire frame body, and the three power terminals encased in the insert injection molding parts are disposed on the wire frame body, the three wire pair plate connection terminals are respectively connected to one end of the three power terminals, and the other end of the three power terminals are connected to the excitation coil; The rotor assembly includes a hollow shaft, a magnetic tile, a magnetic tile support, a rotor steel sleeve, and a yoke. The magnetic tile support is fixedly sleeved on the outer periphery of the hollow shaft, the yoke is fixedly installed on the outside of the magnetic tile support, the magnetic tile is fixedly attached to the outer surface of the yoke, and the rotor steel sleeve is fixedly sleeved on the outer periphery of the magnetic tile for fixing and protecting the magnetic tile.

2. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, The wire-to-board connection terminal is a standard 250 series female terminal.

3. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, The motor wire frame assembly is interference-fitted with the motor stator frame, and the main body of the wire frame is provided with a slot, while the motor stator frame is provided with a barb structure that engages with the three slots.

4. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, An O-ring is provided at the interface between the power connector and the valve block, and an annular groove is provided on the outer wall of the insert injection molded part, and the O-ring is embedded in the annular groove.

5. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, The connection between the line-to-plate connection terminal and the excitation coil adopts a delta connection. Each phase winding of the excitation coil consists of 4 coils connected in series, and each phase winding has two wire ends, which are connected to the corresponding line-to-plate connection terminal.

6. The motor for an electro-hydraulic braking system according to claim 5, characterized in that, The two ends of the V-phase line are located in the first stator slot, and the distance between the stator slots containing the two ends of the W-phase line and the U-phase line, respectively, and the first stator slot does not exceed 3 slot spacings.

7. The motor for an electro-hydraulic braking system according to claim 2, characterized in that, The main body of the wire frame includes a main wire frame and a wire frame cover plate. The three wire-to-board connecting terminals are fixed on the main wire frame. The wire frame cover plate is installed on the main wire frame, forming three fixing slots. The power terminals encapsulated in the insert injection molded part are fixed in the fixing slots.

8. The motor for an electro-hydraulic braking system according to claim 7, characterized in that, Both the main frame and the frame cover are formed by injection molding, and the wire-to-plate connection terminals are formed by stamping.

9. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, The motor housing and the valve block are sealed with a radial O-ring, and the bottom of the motor housing is sealed with a radial O-ring. The stator assembly and the rotor assembly are filled into the inner cavity of the motor housing in a gapless manner. The outer contour of the stator assembly is adapted to the shape of the inner wall of the motor housing, and the gap between them is less than a preset threshold.

10. The motor for an electro-hydraulic braking system according to claim 1, characterized in that, The stator core is T-shaped and there are 12 of them; the number of magnetic tiles is 10.

Images