Rotating motor device and electric power steering device

Abstract

The invention aims to provide a rotating electrical machine device (100) in which, when assembling a control substrate (14) to a busbar support (61) holding a busbar (38), no additional protrusion is required, thereby miniaturizing the busbar support (61) and miniaturizing the rotating electrical machine device (100) and the electric power steering device (150). A first protrusion (611) of the busbar support (61) is provided with a columnar portion (611a) and a plurality of first ribs (611c) and a plurality of second ribs (611b) arranged on its outer circumference parallel to the central axis and spaced apart from each other in the circumferential direction. The first rib (611c) contacts the inner circumferential surface of the first through hole (143) of the control substrate (14), and the second rib (611b) contacts the inner circumferential surface of the second through hole (381) of the busbar (38).

Description

Technical Field

[0001] The present application relates to a rotating electric machine device and an electric power steering device. Background Art

[0002] Currently, there is a rotating electrical machine device in which a control unit is integrated and adjacent to the rotating shaft of the rotating electrical machine in the axial direction. The stator, rotor, and other components are housed within the rotating electrical machine's housing. The control unit is positioned adjacent to the rotating electrical machine in the axial direction and includes a control substrate mounted with an inverter and a control circuit. The inverter flows current through the stator windings, and the control circuit controls the inverter. The rotating electrical machine device also includes a busbar for current flow and a busbar support for holding the busbar.

[0003] An electric power steering system is known in which a protrusion is provided on a busbar support to secure the busbar. The busbar is also provided with a through-hole. The protrusion is pressed into the through-hole to secure the busbar to the support. The protrusion has a columnar portion and a plurality of ribs disposed on its outer circumference parallel to the central axis of the columnar portion. The ribs each contact the inner surface of the busbar through-hole (e.g., Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-061423 Summary of the Invention

[0007] Technical problem to be solved by the invention

[0008] The protrusions on the busbar support described in Patent Document 1 are used to attach the busbars to the busbar support and do not address the securing of other components. Sometimes, within a control unit, it is necessary to further secure other components, such as a wiring board, to the busbar support that holds the busbars. In such cases, it is necessary to provide new protrusions on the busbar support and to provide corresponding through-holes in the wiring board.

[0009] The addition of new protrusions increases the size of the busbar support. Furthermore, in addition to the through-holes required to hold the wiring substrate on the busbar support, the wiring substrate also requires through-holes that avoid the protrusions used to hold the busbar on the busbar support. Consequently, the area occupied by the through-holes on the control substrate increases, reducing the mounting area for wiring and electronic components on the control substrate. To ensure the required mounting area for wiring and electronic components, the total substrate area ultimately increases. This, in turn, becomes a major factor hindering the miniaturization and cost reduction of rotating electrical machines.

[0010] To this end, the purpose of the rotating electrical machine device of the present application is to achieve miniaturization and cost reduction of the busbar holder and the wiring substrate when assembling the wiring substrate to the busbar holder holding the busbar, thereby eliminating the need to provide additional protrusions and making the busbar holder and the wiring substrate smaller and less expensive, thereby making the rotating electrical machine device smaller and less expensive.

[0011] Another object is to reduce the size and cost of a power steering device including the above-mentioned rotating electric machine device.

[0012] Technical solutions used to solve technical problems

[0013] The rotating electrical machine device of the present application comprises:

[0014] a rotating motor having a rotating shaft;

[0015] a wiring substrate, the wiring substrate being arranged on one axial side of the rotating shaft relative to the rotating motor and having a first through hole;

[0016] a bus bar, one surface of which is provided in contact with one surface of the wiring substrate, the bus bar having a second through hole; and

[0017] A busbar support, the busbar support being arranged to contact the other surface of the busbar, and having a protrusion penetrating the first through hole and the second through hole, wherein:

[0018] The protrusion includes a columnar portion, a plurality of first ribs, and a plurality of second ribs. The plurality of first ribs are parallel to the central axis of the columnar portion and are spaced apart from each other in the circumferential direction and are provided on the outer circumferential surface of the columnar portion. The plurality of second ribs are parallel to the central axis of the columnar portion and are spaced apart from each other in the circumferential direction and are provided on the outer circumferential surface of the columnar portion.

[0019] The first rib contacts the inner peripheral surface of the first through-hole of the wiring substrate, and the second rib contacts the inner peripheral surface of the second through-hole of the busbar.

[0020] An electric power steering device disclosed in the present disclosure includes the above-described rotating electric machine device.

[0021] Effects of the Invention

[0022] According to the rotating electrical machine device of the present application, when assembling the wiring substrate to the busbar holder holding the busbar, no additional protrusions are required. Therefore, the busbar holder and wiring substrate can be miniaturized and reduced in cost, thereby achieving miniaturization and cost reduction of the rotating electrical machine device.

[0023] Furthermore, it is possible to achieve miniaturization and cost reduction of an electric power steering device including the rotating electrical machine device of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a circuit diagram of the rotating electrical machine device according to the first embodiment.

[0025] Figure 2 It is a side cross-sectional view of the rotating electrical machine device according to the first embodiment.

[0026] Figure 3 It is a cross-sectional view of the upper surface of the rotating electrical machine device according to the first embodiment.

[0027] Figure 4 It is an enlarged view of a cross section of the rotating electrical machine device according to the first embodiment.

[0028] Figure 5 It is a plan view of the electromagnetic shielding tool of the rotating electrical machine device according to the first embodiment.

[0029] Figure 6 This is a perspective view of a busbar support of a comparative example.

[0030] Figure 7 This is a front view of a busbar support of a comparative example.

[0031] Figure 8 It is a perspective view of a busbar of a comparative example.

[0032] Figure 9 It is a front view of a busbar unit of a comparative example.

[0033] Figure 10 It is a perspective view of a busbar unit of a comparative example.

[0034] Figure 11 This is a first perspective view of a control substrate of a comparative example.

[0035] Figure 12 This is a second perspective view of the control substrate of the comparative example.

[0036] Figure 13 It is a front view of the rotating electrical machine device according to the first embodiment.

[0037] Figure 14 This is a perspective view of the busbar support according to the first embodiment.

[0038] Figure 15 This is a front view of the busbar support in the first embodiment.

[0039] Figure 16 This is a cross-sectional view of the busbar support according to the first embodiment.

[0040] Figure 17 This is a perspective view of the busbar in the first embodiment.

[0041] Figure 18 This is a front view of the busbar in the first embodiment.

[0042] Figure 19 This is a front view of the bus bar unit according to the first embodiment.

[0043] Figure 20 It is a cross-sectional view of the bus bar unit according to the first embodiment.

[0044] Figure 21 This is a perspective view of the control substrate in the first embodiment.

[0045] Figure 22 This is a front view of the control substrate in the first embodiment.

[0046] Figure 23 This is a cross-sectional view of the control substrate according to the first embodiment.

[0047] Figure 24 This is a cross-sectional view of a main part of the control unit according to the first embodiment.

[0048] Figure 25 This is a front view of the control unit in the second embodiment.

[0049] Figure 26 This is a perspective view of a busbar support according to a second embodiment.

[0050] Figure 27 This is a front view of the busbar support in the second embodiment.

[0051] Figure 28 This is a perspective view of a busbar in the second embodiment.

[0052] Figure 29 This is a front view of the busbar in the second embodiment.

[0053] Figure 30 This is a perspective view of a busbar unit according to the second embodiment.

[0054] Figure 31 This is a front view of a busbar unit according to the second embodiment.

[0055] Figure 32 This is a first perspective view of the control substrate according to the second embodiment.

[0056] Figure 33 This is a second perspective view of the control substrate according to the second embodiment.

[0057] Figure 34 It is a structural diagram of an electric power steering device according to a third embodiment. DETAILED DESCRIPTION

[0058] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0059] 1. Implementation Method 1

[0060] <Circuit Structure>

[0061] Figure 1The circuit diagram of the rotating electric machine device 100 shows a control unit 1 and a rotating electric machine 2. The rotating electric machine device 100 can be a type that integrates a three-phase brushless rotating electric machine 2 with a Y-connection or Δ-connection and a control circuit, or a rotating electric machine device that generates electricity while driven by a load and uses the regenerative power to charge a battery. The rotating electric machine device 100 is used not only in the electric power steering device 150 but also in various other applications, including driving vehicle wheels.

[0062] The control unit 1 comprises an inverter circuit 3 that supplies current to the rotating electric machine 2, a control circuit unit 4 equipped with a CPU (central processing unit) 10, a power supply relay switching element 5, and a filter unit 17. The filter unit 17 is provided to suppress noise generated by the inverter circuit 3.

[0063] The filter unit 17 is connected to a power source and a ground terminal from a vehicle-mounted battery 6. Power is supplied to the power supply circuit 13 of the control circuit unit 4 via the ignition switch 7. Sensors 8 are connected to the input circuit 12 of the control circuit unit 4. Examples of these sensors include a steering angle sensor installed near the steering wheel to detect the steering angle, a torque sensor to detect the steering torque, and a speed sensor to detect the vehicle's speed. The power supply from the power supply circuit 13, which passes through the filter unit 17 and the power relay switching element 5, forms the current source for the inverter circuit 3. The filter unit 17 consists of a coil 17a, an X capacitor 17b, and Y capacitors 17c and 17d. Depending on the noise generated by the rotating electrical machine device 100, a common mode coil (not shown) can be added, or coil 17a can be removed. Furthermore, the number of capacitors can be increased or decreased.

[0064] Information from the sensors 8 is transmitted to the CPU 10 via the input circuit 12 of the control circuit unit 4. Based on this information, the CPU 10 calculates and outputs a control variable corresponding to the current for rotating the rotating electric machine 2. The output signal from the CPU 10 is transmitted to the inverter circuit 3 via the drive circuit 11, which constitutes the output circuit. Because only a small current flows through the drive circuit 11, it is located within the control circuit unit 4 and is physically mounted on the control board 14 along with the CPU 10, power supply circuit 13, and input circuit 12. However, the drive circuit 11 can also be located within the power module 35 along with the inverter circuit 3.

[0065] The inverter circuit 3 primarily includes upper-arm switching elements 31U, 31V, and 31W, lower-arm switching elements 32U, 32V, and 32W for the three-phase windings U, V, and W of the rotating electrical machine 2, and rotating electrical machine relay switching elements 34U, 34V, and 34W that connect and disconnect the wiring between the inverter circuit 3 and the windings of the rotating electrical machine 2. The inverter circuit 3 also includes shunt resistors 33U, 33V, and 33W for current detection and smoothing capacitors 30U, 30V, and 30W. Each phase winding has the same circuit configuration, enabling independent current supply to each phase winding.

[0066] Although not shown, the potential difference between the ends of the shunt resistors 33U, 33V, and 33W, as well as the winding terminal voltage of the rotating electric machine 2, are also fed back to the input circuit 12. This information is also input to the CPU 10, which calculates the difference between the calculated current value and the detected value corresponding to the calculated current value and performs feedback control to supply the desired current to the rotating electric machine 2 and operate the rotating electric machine 2.

[0067] The drive circuit 11 also outputs a drive signal for the power relay switching element 5, which operates as a relay that connects and disconnects the battery 6 and the power line of the inverter circuit 3. This power relay switching element 5 can shut off the current supply to the rotating electric machine 2 itself. Rotating electric machine relay switching elements 34U, 34V, and 34W are also provided in the inverter circuit 3, enabling each phase to be disconnected. Furthermore, since large currents flow through the power relay switching element 5, which generates heat, the power relay switching element 5 can be placed in the power module 35 that includes the inverter circuit 3, rather than in the control board 14. The control board 14 is a printed wiring board with electronic components mounted on one or both sides.

[0068] The CPU 10 has an abnormality detection function for detecting abnormalities in the sensors 8, drive circuit 11, inverter circuit 3, and windings of the rotating electrical machine 2. If an abnormality is detected, the CPU 10 shuts off the upper arm switching elements 31U, 31V, and 31W, the lower arm switching elements 32U, 32V, and 32W, or the rotating electrical machine relay switching elements 34U, 34V, and 34W of a specific phase, based on the abnormality, for example, to shut off the current supply to that phase. Furthermore, the power supply relay switching element 5 can be shut off to cut off all current, thereby shutting off the power supply itself at its source.

[0069] The rotating electric machine 2 is a brushless rotating electric machine with three-phase windings connected in a delta configuration. Because it is a brushless rotating electric machine, it is equipped with a rotation sensor 9 for detecting the rotational position of the rotor. This rotation information is also fed back to an input circuit 12. Alternatively, instead of a three-phase delta-connected brushless rotating electric machine, a Y-connected configuration is possible. Furthermore, a two-pole, two-pole brushed rotating electric machine is also possible. The winding specifications are the same as those of conventional devices, and either distributed winding or concentrated winding can be used.

[0070] Next, the filter unit 17 and its surroundings will be described. The PWM (pulse width modulation) control of the inverter circuit 3 of the control unit 1 generates switching noise. The filter unit 17 is provided to prevent this switching noise from being transmitted from the rotating electrical machine device 100 to the outside. Coil 17a is used to suppress normal mode noise and is referred to as a normal mode coil. Furthermore, although not shown, a coil referred to as a common mode coil may also be added to suppress common mode noise.

[0071] X capacitor 17b is called a cross-over capacitor or X capacitor. Y capacitors 17c and 17d are called bypass capacitors or Y capacitors. These filter elements suppress conducted and radiated noise and are known as EMI (electromagnetic interference) filters. The midpoint 17e between Y capacitors 17c and 17d is the vehicle body ground, electrically connected to the vehicle body via a portion of rotating electrical machine device 100.

[0072] Physical Structure

[0073] Figure 2 1 is a side cross-sectional view for explaining the physical structure of the rotating electrical machine device 100 according to the first embodiment, in which the control unit 1 is cut along a cross section including the axis of the rotating electrical machine 2. Figure 2 The rotating electrical machine 2 is positioned below the housing 25, and the control unit 1 is positioned above it. The two components are adjacent and integrated in the axial direction of the rotating shaft 21 of the rotating electrical machine 2. As with conventional devices, the rotating electrical machine 2 is housed within a rotating electrical machine housing 25. A rotor and a stator are positioned around the rotating shaft 21. The rotor is equipped with permanent magnets with multiple pole pairs (not shown). The stator is wound with windings separated by a gap from the rotor. The windings are wound in three phases, with the ends of each phase extending toward the control unit 1 for connection (not shown).

[0074] The upper portion and outer periphery of the control unit 1 are covered by a housing 40. A power connector 42 and a signal connector 43 are located on the upper portion of the housing. The power connector 42 handles the flow of a relatively large current for the power supply system, while the signal connector 43 handles the flow of a relatively small current for the signal system. The power connector 42, signal connector 43, and housing 40 are integrally molded from a resin material.

[0075] Figure 3This is a cross-sectional view of the upper surface of the rotating electrical machine device 100 according to the first embodiment, and is a view of the lower surface of the control unit 1 cut below the top surface of the electromagnetic shield 37 as viewed from the power connector side. In the control unit 1, the heat sink 34 is arranged in the center of the interior of the housing 40.

[0076] A columnar portion 341 having a rectangular cross-section is disposed in the center of the heat sink 34. The control board 14 is disposed longitudinally along one long side of the columnar portion 341 of the heat sink 34. The busbar unit 36 ​​is disposed on the other long side of the columnar portion 341 of the heat sink 34.

[0077] A power module 35 is longitudinally arranged along one side of the short side of the column 341 of the heat sink 34. The power module 35 has terminals for connecting to the control board on one side along the short side and terminals for connecting to the busbar unit on the other side. The terminals for connecting to the control board are connected by soldering or other methods, and the terminals for connecting to the busbar unit are connected by TIG (inert gas) welding or other methods. Figure 2 In FIG. 1 , the power module 35 is provided on the back side of the heat sink and is arranged at the position indicated by the two-dot chain line.

[0078] The heat sink 34 consists of the aforementioned column 341 and an annular base 342 fixed to one longitudinal end of the column 341. The column 341 of the heat sink 34 is positioned in the center of the housing 40 of the control unit 1, with its longitudinal direction aligned with the axis of the housing 40. The base 342 of the heat sink 34 is supported by the rotating electrical machine housing 25, with its outer circumferential surface inscribed within the inner circumferential surface of the rotating electrical machine housing 25. Specifically, the heat sink 34 is positioned such that the base 342 is fixed to the rotating electrical machine housing 25, and the column 341, which is cantilevered from the base 342, protrudes into the interior space of the housing 40.

[0079] Furthermore, an insertion hole is provided in the base portion 342 of the heat sink 34. Ends of the three-phase windings of the rotary electric machine 2 pass through the insertion hole and are connected to bus bars of the bus bar unit 36 ​​of the control unit 1 (not shown).

[0080] The base 342 of the heat sink 34 is formed in a stepped shape. The rotating electrical machine case 25 is fixed to the outer periphery of the large diameter portion of the base 342. A cylindrical metal electromagnetic shield 37 is fixed to the outer periphery of the small diameter portion of the base 342 to suppress noise emission.

[0081] The electromagnetic shield 37 is arranged to cover the columns 341 of the heat sink 34 , the control board 14 , the bus bar unit 36 ​​, and the power module 35 . A portion of the control board 14 protrudes outside the electromagnetic shield through a through hole 371 in an upper portion of the electromagnetic shield. Figure 2In the embodiment, only the control substrate 14 protrudes from the through-hole 371 in the upper portion of the electromagnetic shield. However, a portion of the heat sink 34 and the bus bar unit 36 ​​may also protrude from the through-hole 371.

[0082] The busbar unit 36 ​​consists of a busbar holder 362 in which busbars 361 are embedded in a resin member, smoothing capacitors 30U, 30V, and 30W, and coil 17a. Busbar 361 connects to the ends of the three-phase windings of the rotating electrical machine 2, the connection terminals of the power module 35, the terminals of the smoothing capacitors 30U, 30V, and 30W, and coil 17a, and the power supply and ground terminals extending from the power connector 42.

[0083] Filter Circuit

[0084] The control board 14 is mounted with Figure 1 The control circuit unit 4, the switching element 5 for the power relay, and the filter unit 17 are provided on the control substrate 14. The circuit components for controlling the inverter circuit 3 for supplying current to the rotating motor 2 are installed. The X capacitor 17b and the Y capacitors 17c and 17d constituting the filter are arranged on the protrusion 141 protruding from the through hole 371 on the upper part of the electromagnetic shielding member 37 of the control substrate 14. In addition, the external connection terminals for power supply and ground extending from the power supply connector 42 are connected to the protrusion 141 of the control substrate 14, and the filter unit 17 prevents noise from leaking to the outside through these connection terminals. In addition, Figure 2 In the embodiment, the X and Y capacitors are arranged on the outer periphery of the protrusion 141, but they can also be arranged on the inner periphery of the protrusion 141. Furthermore, while coil 17a is arranged on the busbar unit 36 ​​in the above description, it can also be arranged on the protrusion 141. Since there is no need for a dedicated substrate for the filter circuit or a dedicated circuit support structure for the filter circuit, the control unit can be constructed in a compact and low-cost manner. Furthermore, these components are housed in the housing 40 for protection. Being housed in the housing 40, the components are protected from damage, making the rotating electrical machine device 100 easier to handle.

[0085] In this first embodiment, the X capacitors 17b and Y capacitors 17c and 17d of the filter circuit are arranged on top of the control substrate 14. This eliminates the need for a dedicated substrate for the filter circuit or a dedicated circuit support structure for the filter circuit. This allows for a compact and cost-effective control unit. Furthermore, by providing the noise-removing filter unit 17 outside the through-hole 371 of the electromagnetic shield 37, effective noise reduction measures can be implemented. Since the X and Y capacitors of the filter circuit are grounded through the electromagnetic shield 37, rather than via a heat sink close to the power module path, which is a noise source, noise suppression is achieved.

[0086] Furthermore, the protrusion 141 is disposed in a recessed portion inside the protrusion 40a provided on the upper portion of the housing 40, thereby suppressing an increase in the size of the rotating electrical machine device 100. Specifically, except for protruding portions such as the protrusion 40a of the housing 40 of the control unit 1 of the rotating electrical machine device 100, the top surface of the control unit 1 can be kept compact, thereby successfully achieving miniaturization.

[0087] <Grounding busbar>

[0088] Furthermore, an L-shaped grounding bus bar 38 is disposed below the outer peripheral surface of the control substrate 14 and the top surface of the electromagnetic shield 37 .

[0089] Figure 4 It is an enlarged view of a side cross section along the axis of the rotating electrical machine device 100 according to the first embodiment. Figure 4 The figure shows the connection between the control board 14 and the electromagnetic shield 37. The grounding busbar 38 is L-shaped, with its horizontal surface abutting and electrically connected to the inner side of the upper surface of the electromagnetic shield 37. Its vertical surface abuts and electrically connects to the ground pattern 142 of the control board 14.

[0090] A hexagonal nut 39 is placed below the portion of the grounding busbar 38 that contacts the electromagnetic shield 37. This hexagonal nut 39 is supported by a resin busbar support 61. Screws 60a are screwed in from above the upper surface of the electromagnetic shield 37, creating an electrical connection between the grounding busbar 38 and the lower surface of the electromagnetic shield 37. The hexagonal nut 39 is held in place by the busbar support 61, located below the grounding busbar 38, preventing it from rotating. The busbar support 61, holding the hexagonal nut 39, is assembled to the grounding busbar 38 by press-fitting or other means.

[0091] From the top, the electromagnetic shield 37, grounding busbar 38, and hexagonal nut 39 are assembled in this order, with screw 60a tightened from the top. This assembly method ensures electrical connection between the electromagnetic shield 37 and grounding busbar 38 without any obstructive structures protruding from the space above the screw 60a. This eliminates the need to maintain a sufficient distance between the electromagnetic shield 37 and the housing 40 of the control unit 1, contributing to the axial miniaturization of the control unit 1.

[0092] The vertical surface of the grounding busbar 38 is electrically connected to the ground pattern 142 on the control substrate 14 side. The ground pattern 142, along with the X capacitors 17b and Y capacitors 17c and 17d arranged on the control substrate, constitutes the filter unit 17. The surface of the grounding busbar 38 that contacts the control substrate 14 is screwed from the outer periphery using screws 60b. The vertical portion of the busbar support 61, the vertical portion of the grounding busbar 38, and the control substrate 14 are secured to the screw-fastening base 343 of the heat sink 34 using screws 60b. The grounding busbar 38 and the ground pattern 142 of the filter unit 17 are electrically connected by tightening with screws 60b. Since the filter unit 17 is formed using the ground pattern 142, a highly reliable and low-cost connection is possible.

[0093] Screw 60b is electrically connected to heat sink 34 by threaded fastening. However, the busbar support 61 and the heat sink 34 side of the control board 14 are insulated, so the electromagnetic shield 37 and the ground pattern 142 of the control board 14 are not electrically connected to screw 60b or the heat sink 34. Since the X capacitors 17b and Y capacitors 17c and 17d of the filter circuit are located above the control board 14, there is no need for a dedicated substrate for the filter circuit or a dedicated circuit support structure for the filter circuit. This allows for a compact and low-cost control unit. Furthermore, since the X and Y capacitors of the filter circuit are grounded via the electromagnetic shield 37 rather than via the heat sink, which is close to the noise source (i.e., the power module path), noise can be suppressed.

[0094] The rotating electrical machine 2 is secured from the outer periphery of the central axis by screws 60b, and the vertical surface of the grounding busbar 38 is disposed on the outer periphery of the control board 14. This prevents the structure connecting the electromagnetic shield 37 and the grounding busbar 38 from protruding from the upper surface of the heat sink 34 and wasting space, thereby contributing to the miniaturization of the control unit 1.

[0095] <Electromagnetic shielding parts>

[0096] Figure 5 FIG2 shows a top view of the electromagnetic shielding member 37 of the rotating electrical machine device 100 according to the first embodiment. The upper surface of the electromagnetic shielding member 37 is provided with a through-hole 371 through which the control board 14 protrudes, and a screw insertion hole 372 through which the screw 60a passes. Although not shown, additional holes for positioning during assembly may also be provided. Furthermore, the through-hole 371 may be enlarged to allow a portion of the upper portion of the heat sink 34 or busbar unit 36 ​​to protrude from the electromagnetic shielding member 37.

[0097] <Description of Comparative Example>

[0098] Next, a description will be given of a case where the grounding bus bar 380 and the control substrate 140 are assembled to the bus bar holder 610 according to the method of the comparative example. Figure 6 It is a perspective view of a busbar support 610 of a comparative example. Figure 6 This is a perspective view of the busbar support 610 as viewed from a direction showing the contact surface X of the busbar support 610 with the grounding busbar 380. The busbar support 610 is provided with a first support protrusion 6101, a second support protrusion 6102, a third support protrusion 6103, a fourth support protrusion 6104, a support through-hole 6105 for screw fastening, and a hexagonal nut receiving portion 6110.

[0099] Figure 7 FIG2 shows a front view of the abutment surface X of a busbar support 610 according to a comparative example. The first and second bracket protrusions 6101 and 6102 are used to assemble the busbar support 610 and the grounding busbar 380. The first and second bracket protrusions 6101 and 6102 have first and second bracket columnar portions 6101a and 6102a of the same length. The columnar portion length refers to the total length of the columnar portion extending from its base toward its tip.

[0100] Furthermore, the first bracket protrusion 6101 and the second bracket protrusion 6102 each have multiple ribs of equal length and outer diameter, arranged on the outer circumferences of the first bracket columnar portion 6101a and the second bracket columnar portion 6102a. The rib length refers to the total length of the rib extending from the base of the columnar portion toward the front end. The first bracket protrusion 6101 has four first bracket ribs 6101b arranged at equal intervals. The second bracket protrusion 6102 has two second bracket ribs 6102b arranged horizontally.

[0101] The third and fourth support protrusions 6103 and 6104 are used for assembly with the control board 140. They have third and fourth support columnar portions 6103a and 6104a of equal length. They each have multiple ribs of equal length and outer diameter, arranged on the outer circumferences of the third and fourth support columnar portions 6103a and 6104a, respectively. The third and fourth support protrusions 6103 and 6104 have four third support ribs 6103b equally spaced horizontally and vertically. The fourth support protrusion 6104 has two fourth support ribs 6104b arranged horizontally.

[0102] The lengths of the columnar portions and ribs of the third and fourth bracket protrusions 6103 and 6104 are longer than those of the first and second bracket protrusions 6101 and 6102. Furthermore, the first, second, third, and fourth bracket recesses 6106, 6107, 6108, and 6109 are provided around the grounding busbar contact surface X of the first, second, and fourth bracket protrusions, respectively. The outer diameters of the columnar portions, ribs, and recesses of the first, second, and fourth bracket protrusions are all identical; however, these portions may be identical or different, as long as they are suitable for press-fitting into the corresponding grounding busbar through-holes.

[0103] Figure 8 3 is a perspective view of a grounding bus bar 380 according to a comparative example. Figure 8 This is a perspective view of the grounding busbar 380 as viewed from a direction showing its contact surface Y1 with the control board 140. The grounding busbar 380 is L-shaped. The contact surface Y1 of the grounding busbar 380 with the control board 140 includes a first busbar through-hole 3801 for insertion of the first bracket protrusion 6101 of the busbar bracket 610; a second busbar through-hole 3802 for insertion of the second bracket protrusion 6102; a third busbar through-hole 3803 for insertion of the third bracket protrusion 6103; a fourth busbar through-hole 3804 for insertion of the fourth bracket protrusion 6104; and a fifth busbar through-hole 3805 for insertion of a screw. The surface of the grounding busbar 380 that contacts the electromagnetic shield 37 includes a sixth busbar through-hole 3806 for insertion of the screw 60a and for threaded fastening with the hexagonal nut 39.

[0104] The diameters of the first busbar through-hole 3801 and the second busbar through-hole 3802 are suitable for press-fitting the first support rib 6101b of the first support protrusion 6101 and the second support rib 6102b of the second support protrusion 6102, respectively. Furthermore, the diameter of the third busbar through-hole 3803 is larger than the outer diameter of the third support rib 6103b to prevent contact with the third support rib 6103b of the third support protrusion 6103. The diameter of the fourth busbar through-hole 3804 is larger than the outer diameter of the fourth support rib 6104b to prevent contact with the fourth support rib 6104b of the fourth support protrusion 6104. Furthermore, the diameter of the fifth busbar through-hole 3805 is set larger than the diameter of the support through-hole 6105 for threaded fastening of the busbar support 610 to prevent contact with the screw 60b.

[0105] Figure 9 1 is a front view of a contact surface Y1 of a bus bar unit 620 of a comparative example. The bus bar unit 620 is an assembly in which the grounding bus bar 380 is assembled to a bus bar support 610 . Figure 10This is a perspective view of the busbar unit 620 as viewed from the direction of the contact surface Y1 of the busbar unit 620 with the control board 140. The portion of the first support rib 6101b that is removed when the first support protrusion 6101 is pressed into the first busbar through-hole 3801 is accommodated in the first support recess 6106 provided around the base of the first support protrusion 6101. The same is true for the second support protrusion 6102; the portion of the second support rib 6102b that is removed is accommodated in the second support recess 6107 provided around the base of the second support protrusion 6102. The outer diameter of the third busbar through-hole 3803 is larger than that of the third support rib 6103b to prevent contact with the third support rib 6103b. The outer diameter of the fourth busbar through-hole 3804 is larger than that of the fourth support rib 6104b to prevent contact with the fourth support rib 6104b.

[0106] Figure 11 This is a first perspective view of the control board 140 as viewed from a direction where the contact surface Y2 of the control board 140 with the ground bus bar 380 is visible. The control board 140 is provided with a ground pattern 1402 formed of copper foil, a first through-board hole 1403 of the control board 140 corresponding to the first bracket protrusion 6101, a second through-board hole 1404 of the control board 140 corresponding to the second bracket protrusion 6102, a third through-board hole 1405 of the control board 140 corresponding to the third bracket protrusion 6103, a fourth through-board hole 1406 of the control board 140 corresponding to the fourth bracket protrusion 6104, and a fifth through-board hole 1407 of the control board 140 for inserting a screw.

[0107] Figure 12This is a second perspective view of the control board 140, shown assembled to the busbar unit 620, as viewed from the heat sink 340 side (heat sink 340 not shown). The first and second board through-holes 1403 and 1404 of the control board 140 have inner diameters larger than the outer diameters of the first support rib 6101b of the first support protrusion 6101 and the outer diameters of the second support rib 6102b of the second support protrusion 6102. As a result, the first and second board through-holes 1403 and 1404 do not contact the first and second support ribs 6101b and 6102b. The third and fourth support protrusions 6103 and 6104 are press-fitted into the third and fourth board through-holes 1405 and 1406 of the control board 140. Furthermore, the first and fourth support protrusions 6101 and 6104 are formed so that their front ends protrude toward the heat sink 340 side of the control board 140. Although not shown here, since it is necessary to avoid the first to fourth bracket protrusions 6101 to 6104 protruding from the control substrate 140 to the heat sink 340 side, a retreat hole for avoiding the protrusions is provided in the receiving portion of the heat sink 340 .

[0108] Thus, in the comparative example method, when assembling the control board 140 to the busbar support 610 holding the busbar unit 620, it is necessary to provide a first support protrusion 6101 and a second support protrusion 6102 for assembling the grounding busbar 380, as well as a third support protrusion 6103 and a fourth support protrusion 6104 for assembling the control board 140. Furthermore, corresponding through-holes or relief holes must be provided in the grounding busbar 380, the control board 140, and the heat sink 340. Therefore, the addition of the protrusions increases the size of the busbar support 610. Furthermore, the addition of through-holes to the control board 140 reduces the area available for arranging the control board's connecting wires and components, necessitating an increase in the size of the control board. Furthermore, the need to provide relief holes in the heat sink 340 reduces the degree of freedom in the heat sink 340's shape. As a result, the size of the rotating electrical machine device 100 increases, and the cost increases. Furthermore, the size of the electric power steering device 150 incorporating the rotating electrical machine device 100 increases, and the cost increases.

[0109] <Bus Bar Unit of Embodiment 1>

[0110] The assembly of the grounding busbar 38 and the control substrate 14 to the busbar holder 61 of the first embodiment will be described. Figure 13 It is a front view of the rotating electrical machine device 100 according to the first embodiment. Figure 13This figure shows the control board 14 from the front, with the control unit housing 40 and electromagnetic shield 37 removed. Components not necessary for the description are not shown. The grounding busbar 38 and busbar bracket 61 connecting the control board 14 to the electromagnetic shield 37 are positioned near the centerline of the control board 14 and secured to the heat sink 34 with screws 60b.

[0111] Figure 14 This is a perspective view of the bus bar holder 61 according to the first embodiment as viewed from a direction in which a contact surface P with the grounding bus bar is visible. Figure 15 This is a front view with the abutting surface P of the busbar support 61 facing the front. Figure 16 At section XVI, Figure 15 A cross-sectional view of the busbar support 61 is shown.

[0112] The busbar support 61 is provided with a first protrusion 611, a second protrusion 612, a seventh through-hole 613 for threaded fastening, and a hexagonal nut receiving portion 614. The first protrusion 611 is provided with a columnar portion 611a, and multiple ribs are provided on the outer circumference of the columnar portion 611a. The first protrusion 611 is provided with three first ribs 611c and three second ribs 611b, each of different diameters and lengths. The rib length refers to the total length of the rib extending from the base of the columnar portion to the tip.

[0113] Here, the ribs with large diameter and long length are referred to as first ribs 611c, and the ribs with small diameter and short length are referred to as second ribs 611b. The first ribs 611c are used for pressing toward the control board 14, and the second ribs 611b are used for pressing toward the ground busbar 38.

[0114] A first recessed portion 615, enclosed by a circular shape, is provided around the base of the first protrusion 611 of the busbar support 61, which contacts the grounding busbar 38 on its contact surface P. Furthermore, the second protrusion 612 is formed in a horizontally elongated prism shape with a rhombus cross section. A second recessed portion 616 is provided around the base of the second protrusion 612, which contacts the grounding busbar 38 on its contact surface P.

[0115] Figure 17 This is a perspective view of the grounding bus bar 38 used in the first embodiment as seen from a direction in which a contact surface Q1 of the grounding bus bar 38 that contacts the control substrate 14 can be seen. Figure 18 This is a front view with the contact surface Q1 of the grounding bus bar 38 used in the first embodiment facing the front.

[0116] The grounding busbar 38 is formed into an L-shape. On its contact surface Q1 with the control board, it is provided with a second through-hole 381 for insertion of the first protrusion 611 of the busbar holder 61, a fourth through-hole 382 for insertion of the second protrusion 612, and a sixth through-hole 383 for insertion of a screw. On its contact surface with the electromagnetic shield, an eighth through-hole 384 is provided for insertion of the screw 60a and for threaded fastening with the hexagonal nut 39.

[0117] The second through-hole 381 has a circular portion 381a and multiple notched portions 381b. The circular portion 381a has a diameter corresponding to the press-fitting of the second rib 611b of the first protrusion 611, and the multiple notched portions 381b are provided to avoid the first rib 611c. This allows the busbar support 61 and the grounding busbar 38 to be pressed into place without affecting the shape of the first rib 611c. Furthermore, the fourth through-hole 382 is configured as a notched hole. This design saves component material and facilitates assembly of the grounding busbar 38 to the busbar support 61. Furthermore, the diameter of the sixth through-hole 383 is set larger than the diameter of the seventh through-hole 613 of the busbar support 61, which is used for threaded fastening, to prevent electrical conduction with the screw 60b. While the fourth through-hole 382 of the busbar is configured as a notched hole in the first embodiment, it can also be configured as a circular hole. The circular hole shape is easy to process. In order to restrict the movement of the second protrusion 612, it is more ideal that the shape of the fourth through hole 382 is not a notch hole shape but a through hole without a notch.

[0118] Figure 19 This is a front view showing the bus bar unit 62 in a state where the grounding bus bar 38 is assembled to the bus bar holder 61 according to the first embodiment. Figure 19 This figure shows the front view of the contact surface Q1 where the bus bar holder 61 and the control board 14 contact each other. Figure 20 yes Figure 19A cross-sectional view of the busbar unit 62 in section XX. When the first protrusion 611 is pressed into the second through-hole 381, a portion of the elastically deformed second rib 611b may be scraped off and remain on the abutment surface P of the busbar support 61. If this scraped off portion adheres to the abutment surface P of the busbar support 61, where it abuts the grounding busbar 38, the scraped off portion of the first rib 611c may cause the grounding busbar 38 to float. To prevent this, a first recess 615 with a circular outer circumference is provided. The scraped off portion of the rib is accommodated within the first recess 615, thereby suppressing the floating of the grounding busbar 38. Furthermore, because the second protrusion 612 is molded from resin, a rounded corner is formed at the base. Sometimes, the grounding busbar 38 collides with this rounded corner and floats at the abutment surface P. To prevent this, a second recess 616 is provided around the base of the second protrusion 612. Since the second protrusion 612 is not press-fitted into the fourth through-hole 382 of the ground bus bar 38 , a portion of the second recess 616 may not be surrounded by the inner wall forming the abutment surface P.

[0119] Figure 21 This is a perspective view of the control board 14 according to Embodiment 1, viewed from a direction showing the contact surface Q2 of the control board 14 with the ground bus bar 38. The control board 14 is provided with a ground pattern 142 formed of copper foil, a first through-hole 143 corresponding to the first protrusion 611, a third through-hole 144 corresponding to the second protrusion 612, and a fifth through-hole 145 for inserting the screw 60b.

[0120] Figure 22 This is a front view of the control board 14 in a state where the control board 14 is assembled to the bus bar unit 62 according to the first embodiment. Figure 23 yes Figure 22 A sectional view showing the periphery of the main portion of section XXIII.

[0121] When pressed into the first through-hole 143 of the control board 14, the first rib 611c contacts the inner periphery of the first through-hole 143. Sometimes, when the first rib 611c is pressed into the first through-hole 143, a portion of the elastically deformed first rib 611c is scraped off, leaving the scraped portion on the grounding busbar 38 side of the control board 14. If this scraped portion adheres to the contact surface Q1 between the control board 14 and the grounding busbar 38, the scraped portion can cause the grounding busbar 38 to float relative to the control board 14. This situation is also detrimental to the electrical connection between the ground pattern 142 of the control board 14 and the grounding busbar 38. To prevent this, the notch 381b provided in the second through-hole 381 of the grounding busbar 38 is designed to avoid the first rib 611c. This scraped portion is accommodated in the notch 381 and the first recess 615 of the busbar holder 61, preventing the grounding busbar 38 from floating.

[0122] Figure 24 yes Figure 13 A cross-sectional view of the main portion and surrounding area of ​​section XXIV of FIG. The receiving portion 343 of the heat sink 34 is provided with an escape hole 343a for avoiding the first protrusion 611, an escape hole 343b for avoiding the second protrusion 612, and a screw fastening hole 343c. The first protrusion 611 is assembled so that it is received in the escape hole 343a, and the second protrusion 612 is assembled so that it is received in the escape hole 343b.

[0123] exist Figures 6 to 12 In the comparative example shown, the busbar support 610 needs to be provided with four protrusions, namely the first support protrusion 6101, the second support protrusion 6102, the third support protrusion 6103, and the fourth support protrusion 6104. In contrast, in the first embodiment, as shown in FIG. Figures 13 to 24 As shown, the grounding busbar 38 and the control substrate 14 can be fixed by using the two protrusions, the first protrusion 611 and the second protrusion 612. Therefore, only two through-holes are required, each provided in the control substrate 14 and the grounding busbar 38, and two escape holes are required, provided in the heat sink 34. Therefore, the complexity, volume, and assembly steps of each component can be reduced, which can promote miniaturization and cost reduction. The miniaturization of each component also leads to weight reduction. In addition, the area occupied by the through-holes of the control substrate is reduced, which helps to miniaturize the control substrate and, further, helps to miniaturize the control unit. Therefore, the miniaturization of the rotating electric machine device 100 described in the first embodiment and the power steering device including the rotating electric machine device 100 can be promoted, which also helps to reduce weight and cost.

[0124] Figures 13 to 24 The busbar support 61 of the first embodiment shown in the figure shows an example having two protrusions: a first protrusion 611 and a second protrusion 612. However, the second protrusion 612 can be omitted, and the grounding busbar 38 and the control board 14 can be assembled to the busbar support 61 using only the first protrusion 611. This can eliminate the second protrusion 612, the third through-hole 144 of the control board, and the fourth through-hole 382 of the grounding busbar. This can further reduce the size of the rotating electrical machine device 100 and the power steering device incorporating the rotating electrical machine device 100, thereby contributing to weight reduction and cost reduction.

[0125] like Figure 14 In the example shown, three first ribs 611c and three second ribs 611b of different diameters and lengths are provided on the first protrusion 611. The number of first ribs 611c and second ribs 611b does not necessarily need to be three; any number is sufficient. This is because it is sufficient to press-fit and secure the grounding busbar 38 and the control board 14 to the busbar support 61.

[0126] It is more preferable to provide three or more first ribs 611c and second ribs 611b. This is because if there are three or more first ribs 611c and second ribs 611b, fixation by press-fitting can be performed more stably and center alignment by press-fitting can be performed reliably.

[0127] Furthermore, it is preferable that a plurality of ribs are provided at equal intervals around the columnar portion 611a of the first protrusion 611. This is because fixation by press-fitting can be performed more stably, and center alignment by press-fitting can be performed more reliably.

[0128] Alternatively, the length of the first rib 611c can be set to be greater than the combined thickness of the grounding busbar 38 and the thickness of the control board 14, the length of the second rib 611b can be set to be less than the thickness of the grounding busbar 38, and the diameter of the second rib 611b can be set to be larger than the diameter of the first rib 611c. In this case, the diameter of the first through-hole 143 of the control board 14 is set to fit snugly with the diameter of the first rib 611c, and the diameter of the second through-hole 381 of the grounding busbar 38 is set to fit snugly with the diameter of the second rib 611b. As a result, the grounding busbar 38 and the control board 14 can be press-fitted into the busbar holder 61 even without the notch 381b in the second through-hole 381 of the grounding busbar 38. This eliminates the need for the notch 381b in the second through-hole 381 of the grounding busbar 38, thereby contributing to cost reduction.

[0129] Furthermore, while the example described above uses different diameters for the first and second ribs 611c, 611b, they can also be made to have the same diameter. In this case, by setting the diameter of the second through-hole 381 of the grounding busbar 38 to provide a gentle, tight fit with the diameters of the first and second ribs 611c, 611b, and setting the diameter of the first through-hole 143 of the control board 14 to provide a strong, tight fit, the grounding busbar 38 and the control board 14 can be press-fitted into the busbar holder 61 even without providing the notch 381b in the second through-hole 381 of the grounding busbar 38. This eliminates the need for providing the notch 381b in the second through-hole 381 of the grounding busbar 38, thereby contributing to cost reduction.

[0130] In the first embodiment, the example of securing the grounding busbar 38 to the busbar support 61 is described. However, busbars are not limited to grounding. The securing technique described in the first embodiment to the busbar support 61 can also be applied to busbars for other purposes, such as power supply busbars and busbars for transmitting current for rotating electric machines. Furthermore, in this case, the pattern of the control substrate 14, which is crimped and conductively connected to the busbar, can be configured not as a grounding wiring pattern but as a high-voltage power supply pattern, a pattern for transmitting current for rotating electric machines, or the like.

[0131] In the first embodiment, an example of securing the control substrate 14 to the busbar support 61 is described. However, the substrate secured to the busbar support 61 is not limited to the control substrate 14. The securing technique described in the first embodiment to the busbar support 61 can also be applied to wiring substrates other than control substrates, such as wiring substrates for rotating electric machine drive wiring and wiring substrates for transmitting rotation sensor signals.

[0132] In the first embodiment, the second protrusion 612 is set as Figure 15 The case of a horizontally elongated prism-shaped rhombus cross-section is described. Compared to the first protrusion 611, which has multiple ribs arranged at equal intervals around the columnar portion 611a, the second protrusion 612 is rhombus-shaped. Therefore, if the relative positions of the busbar support 61, the grounding busbar 38, and the control board 14 are incorrectly rotated by 180 degrees, insertion is impossible, thereby facilitating press-in prevention. Furthermore, by providing the second protrusion 612 with a rhombus-shaped cross-section and by adopting the same shape as the fourth through-hole 382 of the grounding busbar 38 and the third through-hole 144 of the control board 14, such as a rhombus or oval, press-in prevention can also be effectively achieved with the second protrusion 612 even if the second protrusion 612 is incorrectly rotated by 90 degrees.

[0133] In the first embodiment, the case where the second protrusion 612 is provided is described. In addition to the first protrusion 611, the second protrusion 612 is provided, thereby having a function of preventing rotation so that the relative positions of the busbar support 61, the grounding busbar 38, and the control substrate 14 will not rotate around the first protrusion 611. Before the final fixation is performed using the screw 60b, the first protrusion 611 and the second protrusion 612 are used to align the positions, thereby improving the assembly performance and contributing to cost reduction. In addition, the following situation can be prevented: after the grounding busbar 38 and the control substrate 14 are pressed into the busbar support 61, the ribs are scraped due to the relative rotation between the components, thereby reducing the pressing and fixing force. In addition, by using the first protrusion 611 and the second protrusion 612 for position alignment, the assembly accuracy of the product is expected to be improved.

[0134] In the first embodiment, a structure is shown in which the grounding busbar 38 and the control board 14 are assembled to the busbar holder 61 and secured to the heat sink 34 using screws 60b. The grounding busbar 38 and the control board 14 are press-fitted and assembled using the first protrusion 611 of the busbar holder 61. Screws 60b are then securely screwed to the heat sink 34 from the seventh screw-fastening through-hole 613 of the busbar holder 61, through the sixth through-hole 383 of the grounding busbar, and through the fifth through-hole 145 of the control board 14. This configuration enables high-strength fixing of the components of the rotating electrical machine device 100 in a compact, simple, and highly precise manner. This is significant because it enables efficient cooling of the control board 14 by the heat sink 34, and because electrical continuity is ensured through the contact surface Q2 where the ground pattern 142 of the control board 14 abuts the base busbar 38, ensuring a high-strength joint.

[0135] In the first embodiment, the second protrusion 612 is provided. Providing the second protrusion 612 in addition to the first protrusion 611 allows for highly accurate determination of the relative positions of the busbar support 61, the grounding busbar 38, and the control substrate 14. Furthermore, a seventh through hole 613 for threaded fastening is provided between the first protrusion 611 and the second protrusion 612, a sixth through hole 383 is provided between the second through hole 381 and the fourth through hole 382 of the grounding busbar 38, and a fifth through hole 145 is provided between the first through hole 143 and the third through hole 144 of the control substrate 14. Furthermore, a screw 60b is threadedly secured from the seventh through hole 613 for threaded fastening via the fourth through hole 382 and the fifth through hole 145 to the threaded fastening hole 343c of the heat sink 34. This structure allows the busbar holder 61, grounding busbar 38, and control board 14, positioned by the first and second protrusions 611, 612, to be fixed to the heat sink 34. Since the screws are fixed to the through-holes between the first and second protrusions 611, 612, the relative positions of the components are not deviated due to the stress and strain caused by the screws, allowing the components to be fixed in the correct position, which is significant.

[0136] In the first embodiment, an electromagnetic shield 37 is provided to surround the control unit 1. The control board 14 housed in the control unit 1 and the grounding busbar 38 are secured together by a busbar bracket 61, with the grounding busbar 38 in contact with the electromagnetic shield 37. This structure allows the busbar bracket 61 to compactly secure the control board 14 and the grounding busbar 38, ensuring contact with the grounding busbar 38. This allows efficient securing in a compact manner, contributing to the miniaturization, weight reduction, and cost reduction of the rotating electrical machine device 100. Furthermore, this contributes to the miniaturization, weight reduction, and cost reduction of the electric power steering device 150 incorporating this rotating electrical machine device 100.

[0137] In the first embodiment, Figure 4 As shown, the control board 14 has a ground pattern 142 on its contact surface Q2, which contacts the ground busbar 38 and is electrically connected by crimping. Furthermore, the ground busbar 38 contacts and is electrically connected to the electromagnetic shield 37. This electrically connects the ground pattern 142 of the control board 14 to the electromagnetic shield 37, effectively shielding against noise through the compact busbar support 61.

[0138] In the first embodiment, Figure 4 As shown, the grounding busbar 38 is L-shaped, with its horizontal surface abutting and electrically connected to the inner side of the top of the electromagnetic shield 37. Its vertical surface abuts and electrically connects to the ground pattern 142 of the control board 14. This structure not only ensures electrical connection between the electromagnetic shield 37 and the grounding busbar 38, but also allows for efficient miniaturization of the electromagnetic shield 36 surrounding the control unit 1, contributing to axial miniaturization of the control unit 1.

[0139] In the first embodiment, Figure 2 、 Figure 4 As shown, the protrusion 141 of the control board 14 passes through the through hole 371 in the upper portion of the electromagnetic shield and protrudes outside the electromagnetic shield. External connection terminals are provided on the protrusion 141 of the control board 14 to prevent noise from propagating to the outside and external noise from intruding, and to enable compact external connections.

[0140] 2. Implementation Method 2

[0141] In the first embodiment, the first protrusion 611 and the second protrusion 612 of the busbar support 61 are arranged side by side along the rotating shaft 21 of the rotating electric machine 2. In addition, the seventh through hole 613 for threaded fastening is provided between the first protrusion 611 and the second protrusion 612. In contrast, the busbar support 61 described in the second embodiment is different in that the first protrusion 611 and the second protrusion 612 are arranged side by side along the rotation direction of the rotating shaft 21 of the rotating electric machine 2. In addition, the seventh through hole 613 for threaded fastening is provided between the first protrusion 611 and the second protrusion 612, and is arranged along the rotation direction of the rotating shaft 21 of the rotating electric machine 2. In the second embodiment, when there are corresponding components to those in the first embodiment, the same reference numerals are provided.

[0142] Figure 25 It is a front view of a rotating electrical machine device 100 according to the second embodiment. Figure 25 This figure shows the control board 14 from the front, with the control unit housing 40 and electromagnetic shield 37 removed. Components not necessary for the description are not shown. The grounding busbar 38 and busbar bracket 61 connecting the control board 14 and the electromagnetic shield 37 are positioned across the centerline of the control board 14 and secured with screws 60b.

[0143] In the first embodiment, the seventh through-holes 613 for threaded fastening of the busbar support 61 are located below the hexagonal nut receiving portion 614. In contrast, in the second embodiment, the seventh through-holes 613 for threaded fastening of the busbar support 61 are located transversely to the hexagonal nut receiving portion 614. By aligning the seventh through-holes 613 and the hexagonal nut receiving portion 614 in the rotational direction of the rotating shaft 21 of the rotating electrical machine 2, the axial dimension of the busbar unit 62 in the rotating shaft 21 of the rotating electrical machine 2 can be reduced. This increases the design freedom of the rotating electrical machine device 100 and makes it easier to avoid collisions with other components. Consequently, this contributes to the miniaturization and cost reduction of the rotating electrical machine device 100.

[0144] Figure 26 This is a perspective view of the bus bar holder 61 according to the second embodiment as viewed from a direction in which a contact surface P of the bus bar holder 61 that contacts the grounding bus bar 38 can be seen. Figure 27 This is a front view of the busbar support 61 according to the second embodiment, in which the contact surface P is provided on the front side.

[0145] The busbar support 61 is provided with a first protrusion 611, a second protrusion 612, a seventh through-hole 613 for threaded fastening, and a hexagonal nut receiving portion 614. The first protrusion has a columnar portion 611a and multiple ribs provided on the outer circumference of the columnar portion 611a. The first protrusion 611 is provided with three first ribs 611c and three second ribs 611b, each of different diameters and lengths. Here, the ribs with larger diameters and longer lengths are designated as the first ribs 611c, and the ribs with smaller diameters and shorter lengths are designated as the second ribs 611b. The first ribs 611c are used for press-fitting toward the control board 14, while the second ribs 611b are used for press-fitting toward the grounding busbar 38.

[0146] Furthermore, a first recess 615 is provided around the first protrusion 611 on the periphery of the contact surface with the grounding busbar 38. Figure 26 、 Figure 27 The second protrusion 612 has a rhombus shape that is long in the vertical direction. A second recess 616 is provided around the second protrusion 612 on the periphery of the surface that contacts the grounding busbar 38 so as to surround the rhombus-shaped second protrusion.

[0147] Figure 28 This is a perspective view of the grounding bus bar 38 according to the second embodiment as viewed from a direction in which a contact surface Q1 of the grounding bus bar 38 that contacts the control substrate 14 can be seen. Figure 29 This is a front view with the contact surface Q1 of the grounding bus bar 38 of the second embodiment facing the front.

[0148] The grounding busbar 38 is L-shaped. The surface of the grounding busbar 38 that contacts the control board 14 is provided with a second through-hole 381 for insertion of the first protrusion 611 of the busbar holder 61, a fourth through-hole 382 for insertion of the second protrusion 612, and a sixth through-hole 383 for insertion of a screw. The surface of the grounding busbar 38 that contacts the electromagnetic shield 37 is provided with an eighth through-hole 384 for insertion of the screw 60a and for threaded fastening with the hexagonal nut 39.

[0149] The second through hole 381 has a circular portion 381a and a plurality of notched portions 381b. The circular portion 381a has a diameter corresponding to the pressure-fitting of the second rib 611b of the first protrusion 611, and the plurality of notched portions 381b are provided to avoid the second rib. Furthermore, the fourth through hole 382 is configured as a notched hole. Furthermore, the diameter of the sixth through hole 383 is set to be larger than the diameter of the seventh through hole 613 of the busbar support 61 for threaded fastening to prevent conduction with the screws. Furthermore, in the second embodiment, the fourth through hole 382 of the grounding busbar 38 is configured as a notched hole. However, it may also be configured as a circular hole.

[0150] Figure 30This is a perspective view of a bus bar unit 62 in a state where a bus bar support 61 and a grounding bus bar 38 are assembled together according to the second embodiment. Figure 30 This is a perspective view of the bus bar unit 62 as viewed from a direction in which a contact surface Q1 of the bus bar unit 62 that contacts the control substrate can be seen. Figure 31 This is a front view of the busbar unit 62 according to the second embodiment, with the abutting surface Q1 facing the front.

[0151] Sometimes, when the first protrusion 611 is pressed into the second through-hole 381, a portion of the elastically deformed second rib 611b is scraped off, leaving the scraped portion on the contact surface of the busbar support 61. If the scraped portion of the second rib 611b adheres to the contact surface P of the busbar support 61 with the grounding busbar 38, the scraped portion of the rib may cause the grounding busbar 38 to float relative to the busbar support 61. To prevent this, a first recess 615 with a circular outer circumference is provided in the busbar support 61. The scraped portion of the rib is accommodated in the first recess 615, thereby suppressing the floating of the grounding busbar 38.

[0152] Furthermore, due to limitations in resin molding, the base of the second protrusion 612 has a rounded corner. Consequently, the grounding busbar 38 may sometimes float above the contact surface. To prevent this, a second recess 616 is provided around the second protrusion 612. Because the grounding busbar 38 is not pressed into the busbar support 61 in the second protrusion, a portion of the recess does not need to be enclosed by the inner wall.

[0153] Figure 32 This is a first perspective view of the control board 14 according to the second embodiment. Figure 32 This is a perspective view of the control board 14, viewed from a direction where the contact surface Q2 with the grounding busbar is visible. The control board 14 is provided with a ground pattern 142 formed of copper foil, a first through-hole 143 corresponding to the first protrusion, a third through-hole 144 corresponding to the second protrusion, and a fifth through-hole 145 for inserting a screw.

[0154] Figure 33This is a second perspective view of the control board 14, as seen from the heat sink side, with the busbar holder 61 assembled to the control board 14 in the second embodiment. As in the first embodiment, when pressed into the first through-hole 143, the first rib 611c contacts the inner periphery of the first through-hole 143 of the control board 14. Sometimes, when the first rib 611c is pressed into the first through-hole 143, a portion of the elastically deformed first rib 611c is scraped off, leaving the scraped portion of the rib on the grounding busbar 38 side of the control board 14. If the scraped portion of the rib adheres to the contact surface Q2 of the control board 14 with the grounding busbar 38, the scraped portion of the rib can cause the grounding busbar 38 to float relative to the control board 14. This situation is also detrimental to the electrical continuity between the ground pattern 142 of the control board 14 and the grounding busbar 38. To prevent this situation, the notch portion 381b of the second through hole 381 provided in the grounding busbar 38 is configured to avoid the shape of the second rib 611b, and the cut portion of the rib is accommodated in the notch portion 381 and the first recess 615 of the busbar bracket 61, thereby preventing the grounding busbar 38 from floating up.

[0155] Although not shown, the receiving portion 343 of the heat sink 34 is provided with an escape hole 343a for avoiding the first protrusion 611, an escape hole 343b for avoiding the second protrusion 612, and a screw fastening hole 343c. The first protrusion 611 is assembled so that it is received in the escape hole 343a, and the second protrusion 612 is assembled so that it is received in the escape hole 343b.

[0156] The rotating electrical machine device 100 described in the second embodiment can also achieve the effects described in the first embodiment. Furthermore, in the second embodiment, since the first protrusion 611, the seventh threaded through hole 613, and the second protrusion 612 of the busbar support 61 are arranged side by side in the rotational direction of the rotating shaft 21 of the rotating electrical machine 2, the dimension of the busbar unit 62 in the axial direction of the rotating shaft 21 of the rotating electrical machine 2 can be reduced. This contributes to further miniaturization of the rotating electrical machine device 100.

[0157] 3. Implementation Method 3

[0158] Figure 34 1 is a configuration diagram of an electric power steering device 150 according to Embodiment 3. An example in which the rotating electrical machine device 100 is applied to the electric power steering device 150 mounted on a vehicle will be described.

[0159] Figure 34This is an example of a rack-type electric power steering device 150. When the driver generates a steering torque in the vehicle's steering mechanism using the steering wheel 150, the torque sensor 152 detects the steering torque and outputs it to the rotating electrical machine device 100. In addition, the speed sensor 153 detects the vehicle's running speed and outputs it to the rotating electrical machine device 100. The rotating electrical machine device 100 generates an assist torque to assist the steering torque based on the inputs from the rotation speed sensor 152 and the speed sensor 153, and supplies it to the steering mechanism of the vehicle's front wheels 154. The torque sensor 152 and the speed sensor 153 are Figure 1 The rotating electrical machine device 100 may generate assist torque based on inputs other than the torque sensor 152 and the speed sensor 153 .

[0160] By miniaturizing the rotating electric machine device 100 used in the electric power steering system 150, vehicle installability is improved. Furthermore, miniaturizing the rotating electric machine device 100 also miniaturizes the electric power steering system 150, contributing to a lighter electric power steering system 150 and improving the vehicle's fuel efficiency. Reducing the cost of the rotating electric machine device 100 also reduces the overall cost of the electric power steering system 150.

[0161] This application describes various exemplary embodiments and examples, but the various features, methods, and functions described in one or more embodiments are not limited to application to specific embodiments and can be applied to the embodiments individually or in various combinations. Therefore, countless variations that are not illustrated are envisioned within the technical scope disclosed in this specification. For example, this includes the case where at least one component is modified, added, or omitted, and also includes the case where at least one component is extracted and combined with components of other embodiments.

[0162] Explanation of symbols

[0163] 1 Control unit; 2 Rotating motor; 14 Control substrate; 142 Ground pattern; 143 First through hole; 144 Third through hole; 145 Fifth through hole; 17 Filter unit; 21 Rotating shaft; 34 Heat sink; 37 Electromagnetic shielding member; 38 Grounding busbar; 60b Screw; 61 Busbar bracket; 62 Busbar unit; 100 Rotating motor device; 150 Electric power steering device; 381 Second through hole; 381a Circular portion; 381b Notch portion; 382 Fourth through hole; 383 Sixth through hole; 611 First protrusion; 611a Columnar portion; 611b Second rib; 611c First rib; 612 Second protrusion; 613 Seventh through hole.

Claims

1. A rotating electrical machine device, comprising: a rotating motor having a rotating shaft; a wiring substrate, the wiring substrate being arranged on one side of the rotating shaft in an axial direction relative to the rotating motor and having a first through hole; a bus bar, one surface of which is provided in contact with one surface of the wiring substrate, the bus bar having a second through hole; and A busbar support, the busbar support being arranged to contact the other surface of the busbar and having a protrusion penetrating the first through hole and the second through hole, It is characterized by: The protrusion has a columnar portion, a plurality of first ribs, and a plurality of second ribs. The plurality of first ribs are parallel to the central axis of the columnar portion and are spaced apart from each other in the circumferential direction and are provided on the outer circumferential surface of the columnar portion. The plurality of second ribs are parallel to the central axis of the columnar portion and are spaced apart from each other in the circumferential direction and are provided on the outer circumferential surface of the columnar portion. The first rib is in contact with an inner peripheral surface of the first through-hole of the wiring substrate, and the second rib is in contact with an inner peripheral surface of the second through-hole of the bus bar.

2. The rotating electrical machine device according to claim 1, wherein: The second rib is provided from a base of the columnar portion toward a front end of the columnar portion to have a length different from that of the first rib.

3. The rotating electrical machine device according to claim 1 or 2, wherein: The second rib protrudes radially from the outer peripheral surface of the columnar portion with an outer diameter different from that of the first rib.

4. The rotating electrical machine according to claim 1 or 2, wherein: The protrusion has three or more first ribs and three or more second ribs.

5. The rotating electrical machine according to claim 1 or 2, wherein: The protrusion has first ribs provided at equal intervals in the circumferential direction on the outer peripheral surface of the columnar portion, and second ribs provided at equal intervals in the circumferential direction on the outer peripheral surface of the columnar portion.

6. The rotating electrical machine device according to claim 1 or 2, wherein: The busbar includes a circular portion that contacts the second rib via an inner peripheral surface, and the second through-hole provided with a notch portion that avoids the first rib.

7. The rotating electrical machine according to claim 1 or 2, wherein: The wiring substrate has a third through hole, The busbar has a fourth through hole, The busbar support has a second protrusion that passes through the third through hole and the fourth through hole.

8. The rotating electrical machine according to claim 1 or 2, wherein: The heat sink includes a mounting surface parallel to the axial direction of the rotating shaft. The wiring substrate is arranged so that one surface contacts the bus bar and the other surface contacts the mounting surface of the heat sink, and the wiring substrate has a fifth through hole. The busbar has a sixth through hole, The busbar support has a seventh through hole and is screwed to the radiator through the fifth through hole to the seventh through hole.

9. The rotating electrical machine according to claim 1 or 2, wherein: include: a control unit, the control unit being disposed on one axial side of the rotating shaft and controlling the rotating motor; as well as an electromagnetic shielding member surrounding the control unit, The wiring substrate is incorporated into the control unit. The busbar has a surface in contact with the electromagnetic shielding member.

10. The rotating electrical machine device according to claim 9, wherein: The wiring substrate has a wiring pattern on a surface in contact with the busbar. The electromagnetic shield is electrically connected to the wiring pattern of the wiring substrate via the bus bar.

11. The rotating electrical machine according to claim 9, wherein: The busbar has an L-shape, and contacts the wiring substrate at one surface of the L-shape and contacts the electromagnetic shielding member at a surface perpendicular to the one surface of the L-shape.

12. The rotating electrical machine according to claim 9, wherein: The wiring substrate has a protruding portion provided with an external connection terminal, The electromagnetic shielding member includes an opening through which the protruding portion of the wiring substrate passes.

13. The rotating electrical machine according to claim 7, wherein: The heat sink includes a mounting surface parallel to the axial direction of the rotating shaft. The wiring substrate is provided so that one surface contacts the busbar and the other surface contacts the mounting surface of the heat sink, and has a fifth through hole between the first through hole and the third through hole. The busbar has a sixth through hole between the second through hole and the fourth through hole, The busbar support has a seventh through hole between the protrusion and the second protrusion, and the busbar support is screwed to the radiator through the fifth through hole to the seventh through hole.

14. The rotating electrical machine device according to claim 13, wherein: The protrusion, the seventh through hole, and the second protrusion of the busbar support are arranged in a row in the rotation direction of the rotating shaft.

15. The rotating electrical machine according to claim 7, wherein: The cross section of the second protrusion of the busbar support is a diamond shape.

16. The rotating electrical machine according to claim 7, wherein: The fourth through hole of the busbar is in a notch shape.

17. The rotating electrical machine according to claim 7, wherein: The fourth through hole of the busbar is circular.

18. An electric power steering device, characterized in that: A rotating electrical machine device comprising the invention as claimed in any one of claims 1 to 17.

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