Integrated electric power steering device

Abstract

The present invention discloses an integrated electric steering drive assist device, belonging to the field of electric drive; the device comprises: a motor assembly, which comprises a dual-winding six-phase permanent magnet synchronous motor; a control circuit board assembly, which comprises a lower circuit board, a flexible portion and an upper circuit board connected in sequence; a power filter assembly, which comprises an inductor, a power connector assembly, a signal connector and a power rectifier circuit board; a power bridge connector, one end of which is connected to the lower circuit board of the control circuit board assembly and the other end is connected to the power connector assembly; a cover, which is arranged on the rear end cover of the dual-winding six-phase permanent magnet synchronous motor; the present invention can conduct the heat generated by the power filter assembly and the control circuit board assembly to the motor housing, which is beneficial to the system heat dissipation of the redundant fault-tolerant electric steering assist device.

Description

Technical Field

[0001] The present invention relates to the field of electric drive technology, and in particular to an integrated electric steering drive power assist device. Background Art

[0002] With the development of intelligent vehicles and steer-by-wire technology, the requirements for the integration, intelligence, and safety of automotive components are becoming increasingly higher. The redundant, fault-tolerant electric drive power assist device required by steer-by-wire technology needs to be integrated (motor and controller integration). Compared with the traditional single-channel controller and motor drive device, it requires a smaller volume, and a smaller space is required to accommodate the motor and dual controller components. This leads to high requirements for space utilization efficiency in the design process of redundant, fault-tolerant electric drive power assist devices in existing steering system applications. The same space requires more components to be arranged while also solving problems such as heat dissipation. Therefore, the volume reduction and structural optimization of redundant, fault-tolerant electric drive power assist devices have great industrial significance. Summary of the Invention

[0003] The object of the present invention is to provide a highly efficient integrated electric power steering device.

[0004] In order to solve the above technical problems, the present invention provides an integrated electric power steering device, comprising:

[0005] A motor assembly comprising a dual-winding six-phase permanent magnet synchronous motor;

[0006] A control circuit board assembly includes a lower circuit board, a flexible portion, and an upper circuit board connected in sequence; the lower circuit board and the upper circuit board are spaced apart; the lower circuit board is mounted on the rear end cover of the dual-winding six-phase permanent magnet synchronous motor, and the motor phase lines of the dual-winding six-phase permanent magnet synchronous motor are connected to the lower circuit board;

[0007] The power filter assembly includes an inductor, a power connector assembly, a signal connector, and a power rectifier circuit board; the inductor, the power connector assembly, and the power rectifier circuit board are connected in sequence; the first end of the signal connector is connected to the upper circuit board;

[0008] A power bridge plug-in, one end of which is connected to the lower circuit board of the control circuit board assembly and the other end is connected to the power connector assembly;

[0009] The cover is arranged on the rear end cover of the double-winding six-phase permanent magnet synchronous motor. The control circuit board assembly, power filter assembly and power bridge connector are all located on the inner side of the cover; a connector housing is installed on the top of the cover; the pins of the power connector assembly and the signal connector both pass through the cover and extend into the connector housing.

[0010] Preferably, the power filter assembly further includes a base;

[0011] Four columns are installed on the rear end cover of the motor, and the base is installed on the top of the upper circuit board through the four columns of the rear end cover of the motor;

[0012] The power connector assembly and the signal connector are both mounted on the base;

[0013] The inductor is installed between the power connector assembly and the base.

[0014] Preferably, a control circuit board through hole is provided on the lower circuit board;

[0015] A phase line connector is installed on the lower circuit board, and the phase line connector cover is arranged on the through hole of the control circuit board;

[0016] The motor phase line passes through the through hole of the lower circuit board and is connected to the lower circuit board through a phase line connector.

[0017] Preferably, a first heat dissipation surface is provided between the base and the inductor.

[0018] Preferably, a first heat-conducting column is installed on the top of the base, and the first heat-conducting column passes through the power connector assembly and is connected to the power rectifier circuit board.

[0019] Preferably, a second heat-conducting column is installed at the bottom of the base, and the second heat-conducting column is connected to the upper circuit board through a heat-conducting adhesive;

[0020] The rear end cover of the motor is connected to the lower circuit board through heat conductive glue.

[0021] Preferably, the power connector assembly and the pins of the signal connector are connected to the connector housing of the cover by potting glue.

[0022] Preferably, a grounding terminal is provided on the power connector assembly, and the power connector assembly is connected to the base via the grounding terminal.

[0023] Preferably, the signal connector includes a dual-channel CAN signal connector and a dual-channel sensor signal connector;

[0024] The power rectifier circuit board is a dual-circuit power rectifier and reverse connection protection circuit board.

[0025] Preferably, the base is an aluminum base.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The power filter assembly of the present invention transmits the rectified and filtered high current to the motor drive circuit board portion of the control circuit board assembly through the power bridge plug-in, bypassing the control portion of the control circuit board assembly. This can effectively save space in the control circuit board assembly and reduce electromagnetic interference from the high-current circuit on the control circuit board of the control circuit board assembly.

[0028] The present invention adopts a stacked design of power filter components and controller circuit board components, which can effectively reduce the axial size of the redundant fault-tolerant electric drive power assist device;

[0029] The aluminum base of the present invention is used for installing and fixing the power filter assembly and the controller circuit board assembly. The aluminum base is connected and fixed to the motor assembly, and the heat generated by the power filter assembly and the control circuit board assembly can be transferred to the motor housing, which is beneficial to the system heat dissipation of the redundant fault-tolerant electric drive assist device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the integrated electric power steering device;

[0032] Figure 2 1 is a schematic diagram of the structure of the cover from a top view;

[0033] Figure 3 It is a schematic side view of the structure of the integrated electric power steering device;

[0034] Figure 4 This is an exploded view of the power filter component;

[0035] Figure 5 This is an exploded view of the cover;

[0036] Figure 6 1. It is a structural diagram of the power connector assembly;

[0037] Figure 7 This is a cross-sectional view of the power filter component;

[0038] Figure 8 This is the assembly drawing of the power connector assembly, inductor, and base;

[0039] Figure 9 It is a schematic diagram of the three-dimensional structure of the power filter component;

[0040] Figure 10 This is a schematic diagram of the front structure of the base;

[0041] Figure 11 This is a schematic diagram of the reverse structure of the base;

[0042] Figure 12 It is a structural diagram of the phase line connector;

[0043] Figure 13 It is an assembly diagram of a circuit board assembly;

[0044] Figure 14Assembling schematic diagrams for control circuit board components and signal connectors;

[0045] Figure 15 A schematic diagram of the structure where the base and the motor housing are connected to dissipate heat;

[0046] Figure 16 This is a schematic diagram of the assembly of the cover and the rear end cover of the motor;

[0047] Figure 17 Schematic diagram of the three-dimensional structure of the cover;

[0048] Figure 18 Schematic diagram of the assembly of the vent plug and the cover;

[0049] Figure 19 It is a structural diagram of a signal connector;

[0050] Figure 20 This is a schematic diagram of the assembly of pins and connectors.

[0051] In the figure: 1. Motor assembly; 1-1. Motor rear end cover; 1-2. Motor phase line; 2. Control circuit board assembly; 2-1. Phase line connector; 201. Lower circuit board; 202. Flexible part; 203. Upper circuit board; 3. Power bridge connector; 4. Base; 5. Power connector assembly; 5-1. Resistance welding terminal; 5-2. Positioning column; 5-3. Ground terminal; 6. Signal connector; 7. Power rectifier circuit board; 8. Cover; 8-1. Cover Claw; 8-2, limiting rib; 9, vent plug; 10, first connector; 11, second connector; 12, third connector; 13, fourth connector; 14, fifth connector; 15, pin; 16, sealant; 17, potting compound; 18, first thermally conductive column; 19, first heat dissipation surface; 20, second thermally conductive column; 21, second heat dissipation surface; 22, lower limit surface; 23, potting compound; 24, inductor; 25, power filter component; 26, thermally conductive compound. DETAILED DESCRIPTION

[0052] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0053] The terms used in one or more embodiments of this specification are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of this specification. The singular forms "a," "the," and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0054] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0055] The present invention is described in further detail below with reference to the accompanying drawings:

[0056] The present invention provides an integrated electric power steering device, comprising:

[0057] A motor assembly 1, comprising a double-winding six-phase permanent magnet synchronous motor;

[0058] The control circuit board assembly 2 includes a lower circuit board 201, a flexible portion 202, and an upper circuit board 203 connected in sequence; the lower circuit board 201 and the upper circuit board 203 are separated by a distance; the lower circuit board 201 is mounted on the motor rear end cover 1-1 of the dual-winding six-phase permanent magnet synchronous motor, and the motor phase line 1-2 of the dual-winding six-phase permanent magnet synchronous motor is connected to the lower circuit board 201;

[0059] The power filter assembly 25 includes an inductor 24, a power connector assembly 5, a signal connector 6, and a power rectifier circuit board 7. The inductor 24, the power connector assembly 5, and the power rectifier circuit board 7 are connected in sequence. The first end of the signal connector 6 is connected to the upper circuit board 203.

[0060] A power bridge plug-in 3, one end of which is connected to the lower circuit board 201 of the control circuit board assembly 2, and the other end is connected to the power connector assembly 5;

[0061] The cover 8 is arranged on the rear end cover 1-1 of the dual-winding six-phase permanent magnet synchronous motor. The control circuit board assembly 2, the power filter assembly 25 and the power bridge connector 3 are all located on the inner side of the cover 8; a connector housing is installed on the top of the cover 8; the pins of the power connector assembly 5 and the signal connector 6 pass through the cover 8 and extend into the connector housing.

[0062] Preferably, the power filter assembly 25 further includes a base 4;

[0063] Four columns are installed on the rear end cover 1-1 of the motor, and the base 4 is installed on the top of the upper circuit board 203 through the four columns of the rear end cover 1-1 of the motor;

[0064] The power connector assembly 5 and the signal connector 6 are both mounted on the base 4;

[0065] The inductor 24 is installed between the power connector assembly 5 and the base 4 .

[0066] Preferably, a control circuit board through hole is provided on the lower circuit board 201;

[0067] The lower circuit board 201 is provided with a phase line connector 2-1, which covers the through hole of the control circuit board.

[0068] The motor phase line 1 - 2 passes through the through hole of the lower circuit board 201 and is connected to the lower circuit board 201 through the phase line connector 2 - 1 .

[0069] Preferably, a first heat dissipation surface 19 is provided between the base 4 and the inductor 24 .

[0070] Preferably, a first heat-conducting column 18 is installed on the top of the base 4 , and the first heat-conducting column 18 passes through the power connector assembly 5 and is connected to the power rectifier circuit board 7 .

[0071] Preferably, a second heat-conducting column 20 is installed at the bottom of the base 4, and the second heat-conducting column 20 is connected to the upper circuit board 203 through a heat-conducting adhesive 26;

[0072] The motor rear end cover 1 - 1 is connected to the lower circuit board 201 via a thermally conductive adhesive 26 .

[0073] Preferably, the pins of the power connector assembly 5 and the signal connector 6 are connected to the connector housing of the cover 8 through a potting compound 17 .

[0074] Preferably, a grounding terminal 5 - 3 is provided on the power connector assembly 5 , and the power connector assembly 5 is connected to the base 4 via the grounding terminal 5 - 3 .

[0075] Preferably, the signal connector 6 includes a dual-channel CAN signal connector and a dual-channel sensor signal connector;

[0076] The power rectifier circuit board 7 is a dual-circuit power rectifier and reverse connection protection circuit board.

[0077] Preferably, the base 4 is an aluminum base.

[0078] In order to better illustrate the technical effects of the present invention, the present invention provides the following specific examples to illustrate the above technical process:

[0079] Example 1: An integrated electric power steering device, comprising a motor assembly 1, a control circuit board assembly 2, a power bridge connector 3, a base 4, a power connector assembly 5, a signal connector 6, a power rectifier circuit board 7, a cover 8, and a vent plug 9 ( Figure 1 、 3 ,4);

[0080] The lead wire of the inductor 24 passes through the square hole reserved in the power connector assembly 5, and is pre-fixed by the slot and buckle at the bottom of the power connector assembly 5, and the lead wire is firmly welded to the resistance welding terminal 5-1 at the corresponding position using the resistance welding process ( Figure 6 ), so that the inductor 24 and the power connector assembly 5 can be installed as a whole on the base 4; the bottom of the inductor 24 is connected to the first heat dissipation surface 19 reserved by the base 4 through the thermal conductive glue 26 ( Figure 10 ); The first heat-conducting column 18 of the base 4 passes through the opening reserved in the power connector assembly 5 and contacts the power rectifier circuit board 7. The heating components in the entire control circuit are connected to the motor housing through the base 4 ( Figure 7 );

[0081] The power rectifier circuit board 7 is mounted on the power connector assembly 5 through the fisheye needle and the buckle. The power connector assembly 5 and the signal connector 6 are fixed to the base 4 with screws to form a power filter component 25 ( Figure 8 ); The middle design of the first heat dissipation surface 19, the second heat dissipation surface 21 is connected to the capacitor and inductor 24 through the heat dissipation glue ( Figure 10 、 11 ), the heating components in the entire control circuit are connected to the motor housing through the base 4 ( Figure 7 );

[0082] The lower end of the power connector assembly 5 is positioned by inserting two positioning columns 5-2 into the corresponding holes of the base 4. Three bolts are used to pass through the mounting holes of the power connector assembly 5 and fix it to the base 4. The bottom of the two mounting holes at the upper end is the exposed grounding terminal 5-3, which is directly in contact with the base 4 after being fixed with screws to play a grounding role ( Figure 8 );

[0083] The control circuit board assembly 2 is provided with a groove to avoid the motor phase line 1-2. The motor phase line 1-2 is shaped by the internal busbar and then led out at a limited position, so that the control circuit board assembly 2 is matched with the phase line connector 2-1 after being assembled in place ( Figure 13 ); One end of the phase line connector 2-1 has a fisheye pin feature that can be directly pressed onto the control circuit board assembly 2, and the other end uses a resistance welding terminal 5-1 (resistance welding process) to weld with the motor phase line 1-2 ( Figure 12 );

[0084] A thermal conductive adhesive 26 is applied between the control circuit board assembly 2 and the motor rear end cover 1-1; when the control circuit board assembly 2 is press-fitted onto the motor rear end cover 1-1, the thermal conductive adhesive 26 is pressed firmly, and the thermal conductive adhesive 26 fully fills the gap between the control circuit board assembly 2 and the motor rear end cover 1-1. The heat generated by the motor drive end circuit can be transferred to the motor through the thermal conductive adhesive 26 and dissipated to the environment ( Figure 7 、 13 )

[0085] The fisheye hole on the control circuit board assembly 2 is aligned with the fisheye pin of the signal connector 6 on the power filter assembly 25 and pressed in. The second heat-conducting column 20 at the lower end of the base 4 is connected to the control circuit board assembly 2 by applying heat dissipation glue. The heat dissipation column corresponds to the chip position one by one. The heat-generating components in the entire control circuit are connected to the motor housing through the base 4 for heat dissipation ( Figure 14 、 15 );

[0086] The middle section of the control circuit board assembly is a flexible circuit board that can be bent 180 degrees. One end of the control circuit board assembly 2 is fixed to the base 4 assembly with screws, and the other end is fixed to the motor rear end cover 1-1 with screws ( Figure 14 ); After the control circuit board assembly 2 is fixed, it is bent 180 degrees to drive the power filter assembly 25 to flip over. After the flip, the mounting holes of the base 4 are aligned with the holes on the columns at the corresponding positions of the motor rear end cover 1-1. The bolts pass through the aluminum base from above to fix the power filter assembly 25 to the motor rear end cover 1-1 ( Figure 13 、 14 );

[0087] One end of the power bridge connector 3 is press-fitted onto the control circuit board assembly 2 using a fisheye needle, and the other end of the power bridge connector 3 is welded to the power filter assembly 25 using a resistance welding process across the base 4 for high current transmission;

[0088] The motor rear end cover 1-1 is provided with a sealant groove, and the cover 8 is provided with a raised sealing rib corresponding to the groove. The sealant 16 is pre-applied to the sealant groove, and the rib of the cover 8 is pressed in to squeeze the sealant 16 to both sides; the cover claw 8-1 clamps the buckle of the motor rear end cover to fix the cover 8 firmly, and after the sealant 16 is cured, the cover 8 and the motor rear end cover 1-1 are firmly bonded and sealed ( Figure 15 、 16 );

[0089] The cover 8 is fixedly sealed with the power connector assembly 5 and the signal connector 6 at the interfaces of the first connector 10, the second connector 11, the third connector 12, the fourth connector 13 and the fifth connector 14 by the potting glue 17 ( Figure 2 、 5 ); The first connector 10, the second connector 11, the third connector 12, the fourth connector 13, and the fifth connector 14 are designed with a potting glue detection surface. When the potting glue is dispensed, the visual system identifies the potting glue detection lower limit surface 22 and the potting glue detection upper limit surface 23; it can achieve precise control of the injection amount to ensure sealing and firmness ( Figure 20 ).

[0090] The vehicle signal and the turn signal are integrated into a signal connector 6, in which the pin 15 adopts a universal design, which can save the cost of a set of molds; the structure of the two plugs is more solid after integration; it is fixed to the base 4 with three screws to optimize the space structure ( Figure 19 ).

[0091] The installation position of the vent plug 9 is designed with matching installation stoppers and protective bosses. The vent plug 9 is pressed into the cover 8 from above. The rubber sealing ring of the vent plug 9 is squeezed and deformed by the oblique mouth of the cover 8 to fit tightly with the oblique surface of the cover 8 and the plane below the sealing plug. At the same time, the lower buckle hooks the stopper of the cover 8 to firmly install the sealing plug, ensuring that the control module space is waterproof and breathable. The raised protective platform can effectively ensure that the vent plug is not damaged by the external environment ( Figure 17 、 Figure 18 );

[0092] The cover 8 is designed with a limited rib 8-2 to limit the radial position of the cover. When the cover 8 is pressed, the corresponding holes of the cover can be aligned with the six connectors and then pressed in to ensure the sealing performance of the assembly ( Figure 16 );

[0093] The control module of the entire redundant fault-tolerant electric drive power assist device is integrated and designed into a cylindrical shape, with a diameter matching the outer diameter of the motor; the rear end cover 1-1 of the motor also serves as the base of the control module, allowing the controller and motor to be integrated and assembled as a unit module. The installation angle can be freely adjusted according to the requirements of the entire steering system, making space utilization more flexible.

[0094] The signal connector 6 and the power connector assembly 5 are fixed to the motor assembly 1 through the base 4; the cover 8 is fixed to the signal connector 6 and the power connector assembly 5 through the potting compound 17, and is fixed to the motor rear end cover 1-1 through the sealant 16 and the built-in buckle; the entire cover is firmly mounted directly or indirectly to the motor rear end cover 1-1 through the triple structure, and is not easily affected by the swing of the external wiring harness; at the same time, the potting compound 17 seal at the connector and the sealing plug when the connector itself is installed complete double sealing protection, which can ensure the protection of the electrical components inside the controller to the greatest extent.

[0095] The redundant, fault-tolerant electric power steering system utilizes a dual power supply, dual CAN signal communication, dual sensor signal communication, dual power supply rectification, and a reverse polarity protection circuit board. The control circuit board assembly utilizes dual CAN signal modules and dual sensor signal modules, along with two PMIC chips, two MCU chips, dual motor drive circuits, and a dual motor position signal module to drive a dual-winding, six-phase permanent magnet synchronous motor. This fully redundant design ensures that the system can maintain 100% system power assistance even if a single circuit fails, and can maintain 50% system power assistance even if any circuit fails.

[0096] This embodiment provides a highly integrated dual-path redundant fault-tolerant electric drive power assist device, which has the following advantages:

[0097] 1. The redundant fault-tolerant electric drive power assist device includes a dual-winding six-phase permanent magnet synchronous motor assembly, a control circuit board assembly, a power bridge connector, a power filter assembly, a signal connector, a controller cover, and a vent plug;

[0098] 2. The redundant fault-tolerant electric drive power assist device is cylindrical in shape as a whole, with a compact internal structure, small size, and reasonable spatial layout;

[0099] 3. The integrated design of the signal connector saves mold costs and installation space, and the installation process is simple and efficient;

[0100] 4. The dual-winding six-phase permanent magnet synchronous motor assembly can adjust the motor output terminal form according to the steering system performance requirements, including but not limited to pulley type, four-claw type, and spline type;

[0101] 5. The dual-winding six-phase permanent magnet synchronous motor assembly can adjust the stator and rotor lengths of the motor within the original motor housing space according to the steering system performance requirements to adjust the motor output torque and speed, thereby adapting to the motor performance requirements of different steering systems;

[0102] 6. The dual-winding six-phase permanent magnet synchronous motor assembly can freely adjust the motor installation angle 360° according to the steering system installation requirements;

[0103] 7. The redundant fault-tolerant electric drive assist device is divided into a large current working area and a small current working area. The small current working area is the control part of the control circuit board assembly, and the large current working area includes the power filter assembly and the motor drive circuit board of the control circuit board assembly. The power filter assembly transmits the rectified and filtered large current to the motor drive circuit board part of the control circuit board assembly through the power bridge plug-in, bypassing the control part of the control circuit board assembly, which can effectively save the space of the control circuit board assembly and reduce the electromagnetic interference of the large current circuit on the control circuit board of the control circuit board assembly.

[0104] 8. The redundant fault-tolerant electric drive power assist device includes a power filter assembly and a controller circuit board assembly. The stacking design of the power filter assembly and the controller circuit board assembly can effectively reduce the axial size of the redundant fault-tolerant electric drive power assist device.

[0105] 9. The metal terminals of the power filter assembly and the metal terminals of the inductor, as well as the motor phase line connector and the motor phase line terminal are welded using resistance welding technology. The resistance welding technology is reliable, efficient, and has low equipment and welding costs.

[0106] 10. The metal terminals on one end of the power filter assembly and the metal terminals on one end of the signal connector assembly are designed as fisheye pins. They are connected to the controller circuit board assembly. After aligning the fisheye pins with the circuit board openings, press them into place. The assembly process is simple, and the connection between the fisheye pins and the controller circuit board assembly openings is firm and reliable.

[0107] 11. The power filter assembly includes a dual-way power connector circuit, a dual-way CAN signal connector, a dual-way sensor signal connector, a dual-way power rectification and anti-reverse connection circuit board, a dual-way power filter assembly, and an aluminum base;

[0108] 12. The control circuit board assembly includes a dual-channel CAN signal module and a sensor signal module, two PMIC chips, two MCU chips, a dual-channel motor drive circuit, a dual-channel motor position signal and a dual-winding six-phase permanent magnet synchronous motor.

[0109] 13. The aluminum base is used to mount and secure the power filter assembly and the controller circuit board assembly. The aluminum base is connected and secured to the motor assembly via screws, allowing heat generated by the power filter assembly and the controller circuit board assembly to be transferred to the motor housing, facilitating system heat dissipation for the redundant, fault-tolerant electric drive assist device.

[0110] 14. The controller cover and the motor are connected and sealed with sealant. A sealant groove is provided on the rear end cover of the motor, and the outer side of the sealant groove is inclined. The controller cover is designed with four claws, which are positioned and installed with the motor housing through snaps. The process is simple, effective, and strong.

[0111] 15. The controller cover and the power connector are sealed with sealant. A sealant groove is provided in the connector of the cover. The top surface of the sealant groove is provided with a high and low plane to help the injection equipment identify and achieve precise control of the injection amount. The sealant is cured by ultraviolet light and tested for airtightness to ensure the sealing performance of the connector.

[0112] The redundant fault-tolerant electric drive assist device includes a power filter component and a controller circuit board component. The redundant fault-tolerant electric drive assist device can still provide 100% system assistance when a part of the circuit fails, or can still provide 50% system assistance when any one of the circuits fails.

[0113] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. Integrated electric power steering device, characterized in that: include: A motor assembly (1) comprising a double-winding six-phase permanent magnet synchronous motor; A control circuit board assembly (2) comprises a lower circuit board (201), a flexible portion (202), and an upper circuit board (203) connected in sequence; the lower circuit board (201) and the upper circuit board (203) are spaced a distance apart; the lower circuit board (201) is mounted on a motor rear end cover (1-1) of a dual-winding six-phase permanent magnet synchronous motor, and the motor phase lines (1-2) of the dual-winding six-phase permanent magnet synchronous motor are connected to the lower circuit board (201); A power filter assembly (25) includes an inductor (24), a power connector assembly (5), a signal connector (6), and a power rectifier circuit board (7); the inductor (24), the power connector assembly (5), and the power rectifier circuit board (7) are connected in sequence; the first end of the signal connector (6) is connected to the upper circuit board (203); A power bridge plug-in (3), one end of which is connected to the lower circuit board (201) of the control circuit board assembly (2), and the other end of which is connected to the power connector assembly (5); A cover (8) is provided on the rear end cover (1-1) of the double-winding six-phase permanent magnet synchronous motor, wherein the control circuit board assembly (2), the power filter assembly (25) and the power bridge connector (3) are all located on the inner side of the cover (8); a connector housing is installed on the top of the cover (8); the pins of the power connector assembly (5) and the signal connector (6) pass through the cover (8) and extend into the connector housing; The power filter assembly (25) further includes a base (4); Four columns are installed on the rear end cover (1-1) of the motor, and the base (4) is installed on the top of the upper circuit board (203) through the four columns of the rear end cover (1-1) of the motor; The power connector assembly (5) and the signal connector (6) are both mounted on the base (4); The inductor (24) is installed between the power connector assembly (5) and the base (4); A first heat dissipation surface (19) is provided between the base (4) and the inductor (24); A second heat-conducting column (20) is installed at the bottom of the base (4), and the second heat-conducting column (20) is connected to the upper circuit board (203) via a heat-conducting adhesive (26); The motor rear end cover (1-1) is connected to the lower circuit board (201) via heat-conducting adhesive (26).

2. The integrated electric power steering device according to claim 1, characterized in that: The lower circuit board (201) is provided with a control circuit board through hole; A phase line connector (2-1) is installed on the lower circuit board (201), and the phase line connector (2-1) is covered on the through hole of the control circuit board; The motor phase line (1-2) passes through the through hole of the lower circuit board (201) and is connected to the lower circuit board (201) via the phase line connector (2-1).

3. The integrated electric power steering device according to claim 2, characterized in that: A first heat-conducting column (18) is installed on the top of the base (4), and the first heat-conducting column (18) passes through the power connector assembly (5) and is connected to the power rectifier circuit board (7).

4. The integrated electric power steering device according to claim 1, characterized in that: The pins of the power connector assembly (5) and the signal connector (6) are connected to the connector housing of the cover (8) via a potting compound (17).

5. The integrated electric power steering device according to claim 1, characterized in that: The power connector assembly (5) is provided with a grounding terminal (5-3), and the power connector assembly (5) is connected to the base (4) via the grounding terminal (5-3).

6. The integrated electric power steering device according to claim 1, characterized in that: The signal connector (6) includes a dual-channel CAN signal connector and a dual-channel sensor signal connector; The power rectifier circuit board (7) is a dual-circuit power rectifier and reverse connection protection circuit board.

7. The integrated electric power steering device according to claim 1, characterized in that: The base (4) is an aluminum base.

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