CN114312989A - Compact electric power-assisted steering power unit - Google Patents

Abstract

The invention relates to the technical field of automobile electric power steering, in particular to a compact power unit for electric power steering. The utility model provides a power unit that electronic power assisted steering of compact, includes motor element, ECU subassembly, apron, its characterized in that: and an ECU component is connected to one side of the motor component, and the motor component and the ECU component are sealed through a cover plate. Compared with the prior art, the compact power unit for the electric power steering is provided, and the main purpose is to reduce the space size of a Powerpack (power unit) in an EPS (electric power steering system), simplify the design structure and improve the manufacturing manufacturability; meanwhile, the heat dissipation capacity of the power unit is improved, and the provided redundant space can also be used as a solution for the power unit of a high-power (large-size) steering system.

Description

A compact electric power steering power unit

technical field

The invention relates to the technical field of automobile electric power steering, in particular to a compact electric power steering power unit.

Background technique

In the existing electric power steering device, the PCB board layout of the ECU in the power unit often adopts two structures; one is a single PCB board design method, in which the size of the PCB board is larger, and the overall radial space size of the ECU becomes larger. , and the actual size is often limited by the installation space of the vehicle; the other is a multi-layer PCB board and adopts the upper and lower structure design method. At this time, the size of the PCB board is constrained by the diameter of the motor and can only be designed to be small, which often requires 3 pieces and The above PCB board has a high product cost, and the internal electrical connection method of the ECU is complicated, and the overall manufacturing process is cumbersome.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the prior art, the present invention provides a compact electric power steering power unit, the main purpose of which is to reduce the space size of the Powerpack (power unit) in the EPS (electric power steering system), simplify the design structure, and improve Its manufacturing process; at the same time, it improves the heat dissipation capacity of the power unit, and the redundant space provided can also be used as a solution for the power unit of the high-power (large model) steering system.

In order to achieve the above purpose, a compact electric power steering power unit is designed, including a motor assembly, an ECU assembly, and a cover plate. seal.

The ECU assembly is located at the top position of the motor assembly or at the side position of the motor assembly.

The top of the motor assembly is connected to the ECU assembly by thermally conductive glue and adhesive glue; the side of the motor assembly is connected to the cover plate by sealant, and a main PCB is arranged between the cover plate and the side of the motor assembly, and the main The periphery of the PCB board is respectively connected with the motor assembly by fixing screws, and thermal grease is provided between the main PCB board and the motor assembly.

The ECU assembly includes an ECU housing, a secondary PCB board, an RPS chip, an external connector interface, a three-phase transfer terminal, an interface pin, a connector, a right-angle pin, a main positioning column, and a secondary positioning column, located in the ECU shell. The top side of the body is provided with a number of external connector interfaces, and the external connector interface is provided with a number of interface pins. The inner wall of the ECU housing below the external connector interface is connected with the upper end of the connector, which is located on the ECU housing. The inner wall on the other side of the top is respectively provided with three-phase transfer terminals, and the lower part of the ECU case is connected with a sub-PCB board with mounting screws. The lower end of the connector is connected to the upper end of the right-angle pin, and the lower end of the right-angle pin penetrates Auxiliary PCB board; the bottom of the auxiliary PCB board is connected to the RPS chip.

The left and right sides inside the ECU casing are respectively provided with auxiliary positioning columns, and the side surfaces of the ECU casing are respectively provided with main positioning columns on the left and right sides.

The structure of the ECU housing matches the structure of the top of the motor assembly.

The cover plate and the main PCB board are of rectangular panel structure, and the outer edge of the cover plate is provided with a plurality of card slots.

The sealant has a rectangular frame structure.

The side of the motor assembly uses another thermal grease and another adhesive to connect to another ECU assembly; the top of the motor assembly uses another sealant to connect to another cover, which is located on the other cover and the motor. There is another main PCB board between the tops of the components, and the other main PCB board is connected with the motor component by fixing screws on the four sides, and another thermal conductive glue is arranged between the other main PCB board and the motor component. The bottom of a main PCB is connected to another RPS chip.

Said another ECU assembly includes another ECU housing, another secondary PCB board, another external connector interface, another three-phase transfer terminal, another interface Pin pin, another connector, another right-angle Pin The needle, the other main positioning post, and the other secondary positioning post are located on one side of the top of the other ECU shell and are provided with several other external connector interfaces, and the other external connector interface is provided with several other interface Pin pins, The upper end of another connector is connected to the inner wall of the other ECU shell located under one side of the interface of the other external connector, and another PCB board is connected to the bottom of the other ECU shell by mounting screws. The lower end of the other connector is connected to the upper end of the other right-angle Pin needle, and the lower end of the other right-angle Pin needle penetrates through the other PCB board.

The left and right sides of the other ECU casing are respectively provided with another auxiliary positioning column, and the side surface of the other ECU casing is provided with another main positioning column on the left and right sides respectively.

The structure of the other ECU casing described above matches the structure of the side surface of the motor assembly.

One side of the other cover plate and the other main PCB board is a rectangular panel with circular arc structure, and the outer edge of the other cover plate is provided with a number of clamping grooves.

The other adhesive is a U-shaped frame structure.

The motor assembly includes a motor casing, a heat-conducting plate, a motor shaft, a rotor, a stator, a three-phase power supply pin, and a magnet assembly. The top of the motor casing is connected with a heat-conducting plate, and inside the motor casing is a The motor shaft, the middle part of the motor shaft is sleeved with a rotor, the outer side of the rotor is sleeved with a stator, and the upper end of the stator is provided with a three-phase power supply pin; the top of the motor shaft penetrates the heat conduction plate and uses a connector to connect the magnet assembly; A fan-shaped boss is provided on the heat-conducting plate on one side of the magnet assembly.

Several rectangular bosses are arranged on the side of the motor housing.

The heat-conducting plate on the other side of the magnet assembly is provided with a waist-shaped groove.

Compared with the prior art, the present invention provides a compact electric power steering power unit, the main purpose of which is to reduce the space size of the Powerpack (power unit) in the EPS (electric power steering system), simplify the design structure, and improve its Manufacturability; at the same time, the heat dissipation capacity of the power unit is improved, and the redundant space provided can also be used as a solution for the power unit of the high-power (large model) steering system.

Description of drawings

FIG. 1 is a block diagram of an electric power steering system to which an example of the present invention is applied.

2 is a perspective view of a compact electric power steering power unit according to Embodiment 1 of the present invention.

3 is an exploded view of the compact electric power steering power unit according to Embodiment 1 of the present invention.

4 is a cross-sectional view 1 of a compact electric power steering power unit according to Embodiment 1 of the present invention.

5 is a cross-sectional view 2 of a compact electric power steering power unit according to Embodiment 1 of the present invention.

6 is a perspective view of an ECU assembly according to Embodiment 1 of the present invention.

7 is a perspective view of an ECU case according to Embodiment 1 of the present invention.

8 is a perspective view of a motor assembly according to Embodiment 1 of the present invention.

9 is a perspective view of the cover plate according to Embodiment 1 of the present invention.

10 is a perspective view of a compact electric power steering power unit according to Embodiment 2 of the present invention.

11 is an exploded view of a compact electric power steering power unit according to Embodiment 2 of the present invention.

12 is a cross-sectional view 1 of a compact electric power steering power unit according to Embodiment 2 of the present invention.

13 is a cross-sectional view 2 of a compact electric power steering power unit according to Embodiment 2 of the present invention.

14 is a perspective view of an ECU assembly according to Embodiment 2 of the present invention.

15 is a perspective view of an ECU case according to Embodiment 2 of the present invention.

16 is a perspective view of a motor assembly according to Embodiment 2 of the present invention.

17 is a perspective view of a cover plate according to Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described below according to the accompanying drawings.

As shown in FIGS. 2 to 17 , an ECU assembly 72 is connected to one side of the motor assembly 71 , and the motor assembly 71 and the ECU assembly 72 are sealed by a cover plate 73 .

The ECU assembly 72 is located at the top position of the motor assembly 71 or at the side position of the motor assembly 71 .

The top of the motor assembly 71 is connected to the ECU assembly 72a by using thermal conductive glue 74 and adhesive glue 75; There is a main PCB board 77 , and the periphery of the main PCB board 77 is connected with the motor assembly 71 by fixing screws, and thermal grease 78 is provided between the main PCB board 77 and the motor assembly 71 .

The ECU assembly 72a includes an ECU housing, a secondary PCB board, an RPS chip, an external connector interface, a three-phase transfer terminal, an interface pin, a connector, a right-angle pin, a main positioning post, and a secondary positioning post, located in the ECU housing 72a The top side of the -1 is provided with a number of external connector ports 72a-4, and the external connector port 72a-4 is provided with a number of port pins 72a-6, and the ECU housing 72a- 1. The upper end of the connector 72a-7 is connected to the inner wall, and the inner wall located on the other side of the top of the ECU housing 72a-1 is respectively provided with three-phase transfer terminals 72a-5, and the lower part of the ECU housing 72a-1 adopts the installation The screw connection is provided with an auxiliary PCB board 72a-2, the lower end of the connector 72a-7 is connected to the upper end of the right-angle pin 72a-8, and the lower end of the right-angle pin 72a-8 penetrates the auxiliary PCB board 72a-2; the said The bottom of the sub PCB board 72a-2 is connected to the RPS chip 72a-3.

The left and right sides of the ECU housing 72a-1 are provided with auxiliary positioning posts 72a-10, respectively, and the left and right sides of the ECU housing 72a-1 are provided with main positioning posts 72a-9, respectively.

The structure of the ECU case 72a-1 matches the structure of the top of the motor assembly 71.

The cover plate 73a and the main PCB board 77 are rectangular panel structures, and the outer edge of the cover plate 73a is provided with a plurality of slots.

The sealant 76 is a rectangular frame structure.

The side of the motor assembly 71 is connected to another ECU assembly 72b by another thermal grease 79 and another adhesive 710; the top of the motor assembly 71 is connected to another cover 73b by another sealant 711, which is located on the other side Another main PCB board 712 is arranged between the cover plate 73b and the top of the motor assembly 71, and the periphery of the other main PCB board 712 is respectively connected with the motor assembly 71 by fixing screws, and the other main PCB board 712 is connected with the motor assembly. Another thermally conductive adhesive 713 is disposed between 71 , and another RPS chip 714 is connected to the bottom of another main PCB board 712 .

The other ECU assembly 72b includes another ECU housing, another secondary PCB board, another external connector interface, another three-phase transfer terminal, another interface Pin pin, another connector, another right-angle Pin pin, The other main positioning column and the other auxiliary positioning column are located on one side of the top of the other ECU housing 72b-1 with a plurality of other external connector interfaces 72b-4, and the other external connector interfaces 72b-4 are provided with Several other interface Pins 72b-6 are connected to the inner wall of the other ECU housing 72b-1 located under one side of the other external connector interface 72b-4 with the upper end of the other connector 72b-7, and the other ECU The lower part of the housing 72b-1 is connected with another secondary PCB board 72b-2 by means of mounting screws. The lower end of the other connector 72b-7 is connected to the upper end of another right-angled Pin The lower end of the needle 72b-8 penetrates the other secondary PCB board 72b-2.

The left and right sides of the inside of the other ECU casing 72b-1 are respectively provided with another auxiliary positioning column 72b-10, and the side surface of the other ECU casing 72b-1 is provided with another main positioning column 72b- 9.

The structure of the other ECU case 72b-1 matches the structure of the side surface of the motor assembly 71.

One side of the other cover plate 73b and the other main PCB board 712 is a rectangular panel with a circular arc structure, and the outer edge of the other cover plate 73b is provided with a plurality of slots.

The other adhesive 710 is a U-shaped frame structure.

The motor assembly 71 includes a motor casing, a heat conduction plate, a motor shaft, a rotor, a stator, a three-phase power supply pin, and a magnet assembly. The top of the motor casing 71-1 is connected with a heat conduction plate 71-4, located in the motor casing. Inside the body 71-1 is a motor shaft 71-2, a rotor 71-5 is sleeved in the middle of the motor shaft 71-2, a stator 71-6 is sleeved outside the rotor 71-5, and a stator 71-6 is sleeved at the upper end of the stator 71-6. There is a three-phase power supply pin 71-7; the top of the motor shaft 71-2 penetrates through the heat-conducting plate 71-4 and uses a connector to connect the magnet assembly 71-3; the heat-conducting plate 71-4 on one side of the magnet assembly 71-3 There is a fan-shaped boss 71-8 thereon.

Several rectangular bosses 71-9 are provided on the side surface of the motor housing 71-1.

The heat-conducting plate 71-4 on the other side of the magnet assembly 71-3 is provided with a waist-shaped groove 71-10.

The present invention provides two specific implementation cases. In the first embodiment, the ECU components are arranged on the top of the motor; in the second embodiment, the ECU components are arranged on the side of the motor, and the external wiring harness interfaces are oriented differently. Vehicle installation direction and space size constraint selection.

Power steering principle: As shown in Figure 1, the steering wheel 1 is connected to the pipe column 3, the torque angle sensor 4 is provided between the input shaft 2 and the output shaft 6 in the pipe column 3, the power unit 7 is connected to the deceleration mechanism 5, and the deceleration mechanism 5 connected to the output shaft 6 . When the steering wheel 1 is turned, the input shaft 2 forms an angle difference with respect to the output shaft 6, the torque angle sensor 4 detects the torque angle and the steering wheel angle, and transmits the signal to the ECU component in the power unit 7, and the ECU component drives the motor according to the signal. The torque acts on the output shaft 6 through the deceleration mechanism 5 to achieve boosting. The output shaft 6 is connected with the mechanical steering gear 9 through the intermediate shaft 8, the torque is converted into the axial force of the rack, and the wheels are driven to realize steering.

Embodiment 1:

As shown in FIGS. 2 to 9 , the ECU assembly 72a is composed of an ECU housing 72a-1, a secondary PCB board 72a-2, a number of mounting screws, and a connector 72a-7. The connector 72a-7 is insert-molded into the ECU housing 72a. In -1, the connector 72a-7 is connected to the right-angle pins 72a-8, the ECU housing 72a-1 is provided with an external connector interface 72a-4, and the external connector interface 72a-4 contains several interface Pins 72a-6 , The ECU housing 72a-1 is also provided with a three-phase transfer terminal 72a-5, a bushing. The auxiliary PCB board 72a-2 is positioned by two auxiliary positioning posts 72a-10, and is mounted and fixed on the bushing by mounting screws. A welding area is formed; the three-phase welding end of the three-phase transfer terminal 72a-5 is welded with the corresponding welding hole on the auxiliary PCB board 72a-2 to form a welding area; the interface of the interface Pin 72a-6 of the external connector interface 72a-4 The welding ends are welded with the corresponding welding holes on the auxiliary PCB board 72a-2 to form welding areas in turn to realize electrical connection.

The U-shaped grooves on the ECU housing 72a-1 are matched with the protruding ribs on the motor housing 71-1 through the adhesive 75 to realize the connection between the ECU assembly 72a and the motor assembly 71. At the same time, the auxiliary PCB board 72a-2 is provided with There are perforations corresponding to the positions of the three opposite spigot ends of the three-phase transfer terminals 72a-5. The motor assembly 71 contains a set of three-phase power pins 71-7. When the ECU assembly 72a and the motor assembly 71 are installed in pairs, The pins 71-7 of the three-phase power supply pass through the through holes and are matched with the three opposite sockets to realize electrical connection. At the same time, the motor assembly 71 also includes a heat conduction plate 71-4 and a motor shaft 71-2, a magnet assembly 71-3 is installed on the motor shaft 71-2, and a fan-shaped boss 71-8 is arranged on the heat conduction plate 71-4. A thermally conductive adhesive is provided between the auxiliary PCB board 72a-2 and the fan-shaped bosses 71-8 for heat conduction of the auxiliary PCB board 72a-2. The RPS chip 72a-3 on the secondary PCB board 72a-2 is located just above the magnet assembly 71-3, and is used for the measurement of the motor rotation angle signal.

After the ECU assembly 72a and the motor assembly 71 are installed, the main PCB board 77 is positioned through the two main positioning posts 72a-9 on the ECU housing 72a-1, and fixed to the screw holes by fixing screws. The adapter end is welded with the corresponding welding hole on the main PCB board 77 to form a welding area and realize electrical connection. Thermal grease 78 is provided between the rectangular boss 71-9 and the main PCB board 77 for heat conduction of the main PCB board 77, and partitions are provided on both sides of the motor housing 71-1 to accelerate the heat dissipation of the motor. The motor housing 71-1 is also provided with protruding ribs, which form a complete circle with the protruding ribs on the ECU housing 72a-1, and cooperate with the cover plate 73a together. Sealing, the cover plate 73a is also provided with a slot for the limit of the cover plate 73a.

Embodiment 2:

As shown in FIGS. 10 to 17 , another ECU assembly 72b is composed of another ECU housing 72b-1, another secondary PCB board 72b-2, several mounting screws, another connector 72b-7, and another connector 72b-7. 72b-7 is insert-molded in another ECU housing 72b-1, another connector 72b-7 is connected to another right-angle Pin 72b-8, and another ECU housing 72b-1 is provided with another external connector interface 72b-4, another external connector interface 72b-4 contains several other interface pins 72b-6, and another ECU housing 72b-1 is also provided with a bushing. The other pair of PCB board 72b-2 is positioned by the other pair of positioning posts 72b-10 at two places, and is fixed on the bushing by means of mounting screws. The corresponding welding hole on 72b-2 is welded to form a welding area; the interface welding end of the other interface Pin 72b-6 of the other external connector interface 72b-4 is welded with the corresponding welding hole on the other PCB board 72b-2, Solder pads are formed in sequence to realize electrical connection.

The U-shaped groove on the other ECU housing 72b-1 is matched with the convex rib on the motor housing 71-1 through another adhesive 710 to realize the connection between the other ECU assembly 72b and the motor assembly 71. In addition, the motor housing 71-1 is provided with a rectangular boss 71-9, and another thermal grease 79 is provided between the rectangular boss 71-9 and the other secondary PCB board 72b-2 for the other secondary PCB For the heat conduction of the plate 72b-2, the two sides of the motor casing 71-1 are provided with baffles to accelerate the heat dissipation of the motor.

The motor assembly 71 is provided with a heat conducting plate 71-4, a motor shaft 71-2, a magnet assembly 71-3 is mounted on the motor shaft 71-2, and the motor assembly 71 is also provided with a three-phase power supply pin 71-7. The heat-conducting plate 71-4 is provided with a fan-shaped boss 71-8 and screw holes. After the installation of the other ECU assembly 72b and the motor assembly 77 is completed, the other main PCB board 712 is positioned by two other main positioning posts 72b-9 on the other ECU housing 72b-1, and is fixed on the screw holes by fixing screws. , the transfer end of the other right-angle pin 72b-8 is welded with the corresponding welding hole on the other main PCB board 712 to form a welding area and realize electrical connection. The pins 71-7 of the three-phase power supply are welded with corresponding welding holes on the other main PCB board 712 to form a welding area. Another RPS chip 714 on the other main PCB board 712 is located just above the magnet assembly 71-3, and is used for the measurement of the motor rotation angle signal. Another thermal conductive adhesive 713 is arranged between the fan-shaped boss 71-8 and the other main PCB board 712 for heat conduction of the other main PCB board 712, and the motor housing 71-1 is also provided with a rib and another ECU The convex ribs on the shell 72b-1 form a complete circle, which cooperates with the cover plate 73b. The whole circle of ribs and the cover plate 73b are bonded and sealed by another sealant 711. the limit of the cover plate 73b.

The main PCB board and the auxiliary PCB board of the present invention are vertically arranged on the motor side, and the space volume is small.

The heat dissipation of the two PCB boards is transmitted to the motor casing through thermal conductive glue/thermal grease, and two sets of partitions are arranged on the motor casing to improve the heat dissipation efficiency.

The connector realizes the electrical connection between the main PCB board and the secondary PCB board. The connector is embedded in the ECU shell. Compared with the single connector transfer solution, the integrated structure greatly simplifies the product structure and manufacturing process. Compared with the board method, the cost is lower.

The fixing of the ECU components and the motor components, as well as the fixing of the two and the cover plate, are all glued, and the process is simple.

The external connector interface can be flexibly selected to implement case 1 or implementation case 2 according to the assembly installation location and operating space.

Claims (17)

1. A compact electric power steering power unit, comprising a motor assembly, an ECU assembly, and a cover, characterized in that: one side of the motor assembly (71) is connected with an ECU assembly (72), the motor assembly (71) and The ECU assembly (72) is sealed by the cover plate (73). 2. A compact electric power steering power unit according to claim 1, characterized in that: the ECU assembly (72) is located at the top position of the motor assembly (71) or at the side position of the motor assembly (71). . 3. A compact electric power steering power unit according to claim 1 or 2, characterized in that: the top of the motor assembly (71) is connected with a thermally conductive glue (74) and an adhesive (75) The ECU assembly (72a); the side surface of the motor assembly (71) is connected with the cover plate (73a) by using sealant (76), and a main PCB is arranged between the cover plate (73a) and the side surface of the motor assembly (71) Board (77), the periphery of the main PCB board (77) is respectively connected with the motor assembly (71) by fixing screws, and thermal grease (78) is provided between the main PCB board (77) and the motor assembly (71). 4. A compact electric power steering power unit according to claim 3, characterized in that: the ECU assembly (72a) comprises an ECU housing, a secondary PCB board, an RPS chip, an external connector interface, three Phase transfer terminal, interface pin, connector, right-angle pin, main positioning column, auxiliary positioning column, there are several external connector interfaces (72a-4) located on the top side of the ECU housing (72a-1), The external connector interface (72a-4) is provided with a number of interface Pins (72a-6), and a connector ( The upper end of 72a-7) and the inner wall on the other side of the top of the ECU casing (72a-1) are respectively provided with three-phase transfer terminals (72a-5), and the lower part of the ECU casing (72a-1) adopts mounting screws The connection is provided with a secondary PCB board (72a-2), the lower end of the connector (72a-7) is connected to the upper end of the right-angle pin (72a-8), and the lower end of the right-angle pin (72a-8) penetrates the secondary PCB board. (72a-2); the bottom of the auxiliary PCB board (72a-2) is connected to the RPS chip (72a-3). 5. A compact electric power steering power unit according to claim 4, characterized in that: the left and right sides inside the ECU housing (72a-1) are respectively provided with auxiliary positioning columns (72a-10). ), the sides of the ECU housing (72a-1) are provided with main positioning posts (72a-9) on the left and right sides respectively. 6. A compact electric power steering power unit according to claim 4, characterized in that: the structure of the ECU housing (72a-1) matches the structure of the top of the motor assembly (71). 7. A compact electric power steering power unit according to claim 3, characterized in that: the cover plate (73a) and the main PCB board (77) are of rectangular panel structure, and the cover plate (73a) has a rectangular panel structure. There are several card slots on the outer edge. 8. A compact electric power steering power unit according to claim 3, characterized in that: the sealant (76) is a rectangular frame structure. 9. A compact electric power steering power unit according to claim 1 or 2, characterized in that: the side surface of the motor assembly (71) adopts another thermal grease (79) and another adhesive glue (710) Connect another ECU assembly (72b); the top of the motor assembly (71) is connected with another cover plate (73b) by using another sealant (711), and the other cover plate (73b) is connected to the motor Another main PCB board (712) is arranged between the tops of the components (71), and the periphery of the other main PCB board (712) is respectively connected with the motor component (71) by means of fixing screws. The other main PCB board (712) Another thermally conductive adhesive (713) is arranged between 712) and the motor assembly (71), and another RPS chip (714) is connected to the bottom of another main PCB board (712). 10. A compact electric power steering power unit according to claim 9, characterized in that: the other ECU assembly (72b) comprises another ECU housing, another auxiliary PCB board, another external Connector interface, another three-phase transfer terminal, another interface pin, another connector, another right-angle Pin, another main positioning post, another secondary positioning post, located in another ECU housing (72b- 1) There are several other external connector interfaces (72b-4) on one side of the top, and several other interface Pins (72b-6) are arranged in the other external connector interface (72b-4), located on the other side. The inner wall of the other ECU housing (72b-1) below one side of the external connector interface (72b-4) is connected with the upper end of the other connector (72b-7), and the other ECU housing (72b-1) There is another PCB board (72b-2) on the bottom of the connector (72b-7) connected with mounting screws, the lower end of the other connector (72b-7) is connected to the upper end of another right-angle pin (72b-8), The lower end of the pin (72b-8) penetrates the other PCB board (72b-2). 11. A compact electric power steering power unit according to claim 10, characterized in that: the left and right sides of the inside of the other ECU casing (72b-1) are respectively provided with another auxiliary positioning column (72b-10), the side surface of the other ECU housing (72b-1) is provided with another main positioning column (72b-9) on the left and right sides respectively. 12. A compact electric power steering power unit according to claim 10, characterized in that: the structure of the other ECU housing (72b-1) is the same as the structure of the side surface of the motor assembly (71). match. 13. A compact electric power steering power unit according to claim 9, characterized in that: the other cover plate (73b) and the other main PCB board (712) are provided on one side of a rectangular panel. It has a circular arc structure, and the outer edge of the other cover plate (73b) is provided with a number of slots. 14. A compact electric power steering power unit according to claim 9, characterized in that: the other adhesive (710) is a U-shaped frame structure. 15. A compact electric power steering power unit according to claim 1 or 2, characterized in that: the motor assembly (71) comprises a motor housing, a heat conducting plate, a motor shaft, a rotor, a stator, Three-phase power supply pin and magnet assembly, the top of the motor housing (71-1) is connected with a heat conduction plate (71-4), and inside the motor housing (71-1) is provided with a motor shaft (71-2) ), a rotor (71-5) is sleeved in the middle of the motor shaft (71-2), a stator (71-6) is sleeved outside the rotor (71-5), and three Phase power pin (71-7); the top of the motor shaft (71-2) penetrates the heat conduction plate (71-4) and uses a connector to connect the magnet assembly (71-3); located in the magnet assembly (71-3) ) on one side of the heat-conducting plate (71-4) is provided with a fan-shaped boss (71-8). 16. A compact electric power steering power unit according to claim 13, characterized in that: a plurality of rectangular bosses (71-9) are provided on the side surface of the motor housing (71-1). 17. A compact electric power steering power unit according to claim 13, characterized in that: a waist-shaped groove is provided on the heat conducting plate (71-4) on the other side of the magnet assembly (71-3) (71-10).

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