Rotating motor device and electric power steering device

Abstract

The rotating electrical machine device (100) of the present application adopts a structure in which an external terminal is connected to a protrusion (141) protruding from a through hole (371) of an electromagnetic shielding member (37) on a control substrate (14) of a control unit (1) and a filter unit (17) is provided, thereby ensuring noise removal capability. Since the existing dedicated wiring substrate for mounting the filter unit (17) is not required, it can contribute to miniaturization and cost reduction. Furthermore, it can contribute to miniaturization and cost reduction of an electric power steering device (150) equipped with the rotating electrical machine device (100) of the present application.

Description

Technical Field

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

[0002] Conventional rotating electrical machine devices have a control unit integrated with the output shaft of the rotating electrical machine, adjacent to the machine's axial direction. The stator, rotor, and other components are housed within the housing of the rotating electrical machine. The control unit, located adjacent to the machine's axial direction, includes an inverter that supplies current to the stator windings and a control substrate on which a control circuit for controlling the inverter is mounted.

[0003] Examples of conventional rotating electrical machine devices include those employing a so-called longitudinal arrangement of main components, in which the inverter and control substrate are arranged parallel to the axis of the rotating electrical machine (e.g., Patent Document 1). Another example of a conventional drive device includes those employing a so-called transverse arrangement of main components, in which the inverter and control substrate are arranged perpendicular to the axis of the rotating electrical machine and the control substrate and a filter substrate for noise suppression are layered (e.g., Patent Document 2).

[0004] For rotating electric machine devices and electric power steering systems incorporating them, particularly those in which the rotating electric machine and control unit are integrated, noise suppression measures within the control unit are crucial. Noise suppression filters, consisting of capacitors and coils, are typically installed separately from the control board, using separate boards or circuit support structures, regardless of whether the inverter circuit and control board are placed vertically or horizontally.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6608555

[0008] Patent Document 2: International Publication No. 2018 / 047342 Summary of the Invention

[0009] Technical problem to be solved by the invention

[0010] There are rotating electric machine devices for electric power steering systems that integrate a rotating electric machine and a control unit, arranged adjacent to each other along the axial direction of the rotating electric machine's output shaft. In these rotating electric machine devices, the inverter and inverter drive circuit, etc., that drive the rotating electric machine, generate voltage noise. This generated voltage noise propagates through the rotating electric machine device's power supply, signal terminals, and substrate, and then through connectors to the outside of the rotating electric machine device. Alternatively, the generated voltage noise propagates through the heat sink and the rotating electric machine's housing, and then through the rotating electric machine's flange to the outside of the rotating electric machine device. Therefore, to prevent this noise from propagating outside the rotating electric machine device, filters and electromagnetic shielding are required to attenuate the noise.

[0011] To shorten wiring, power modules such as inverters that drive rotating electric machines, as well as the drive circuits that drive the power modules, are preferably located near the rotating electric machines. Therefore, the power modules and the control substrate on which the drive circuits that drive the power modules are mounted are placed adjacent to each other. Furthermore, to prevent noise from being superimposed on the wiring after attenuation, the filter circuit must be located near the opening of the shield. Therefore, the filter circuit requires a dedicated wiring substrate or circuit support structure near the shield opening to accommodate a filter circuit separate from the control substrate on which the inverter drive circuits are mounted. The presence of such a dedicated wiring substrate or circuit support structure hinders the miniaturization and cost reduction of rotating electric machine devices. Consequently, this also hinders the miniaturization and cost reduction of power steering devices equipped with rotating electric machine devices.

[0012] Here, an object of the rotating electric machine device involved in the present application is to provide a rotating electric machine device and a power steering device including the rotating electric machine device, which do not require a dedicated wiring board or a dedicated circuit support structure for mounting the filter and have a filter with high noise removal capability.

[0013] Technical means for solving technical problems

[0014] The rotating electrical machine device involved in this application includes:

[0015] a rotating electric machine having a rotating shaft;

[0016] a control unit provided on one side of the rotating shaft in the axial direction of the rotating motor and configured to control the rotating motor;

[0017] a control substrate provided in the control unit and having a protrusion extending toward one side in the axial direction of the rotating shaft;

[0018] an electromagnetic shielding member surrounding the control unit and provided with a through hole through which the protruding portion of the control substrate passes;

[0019] an external connection terminal disposed outside the electromagnetic shield and mounted on the protruding portion of the control substrate; and

[0020] A filter is arranged outside the electromagnetic shield and mounted on the protruding portion of the control board to attenuate noise components propagating toward the external connection terminals.

[0021] An electric power steering device according to the present application includes the above-mentioned rotating electrical machine device.

[0022] Effects of the Invention

[0023] The rotating electric machine device and electric power steering system of the present application eliminate the need for a dedicated wiring substrate or circuit support structure for mounting a filter, and a filter with noise-canceling capabilities is provided outside the through-hole of the electromagnetic shielding member. This eliminates the need for a dedicated wiring substrate or circuit support structure for mounting a filter, contributing to miniaturization and cost reduction. Furthermore, this can contribute to miniaturization and cost reduction of the electric power steering system incorporating the rotating electric 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 This is an enlarged side cross-section of the rotating electrical machine device according to the first embodiment, taken along the axis.

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

[0029] Figure 6 This is a second plan view of the electromagnetic shielding tool of the rotating electrical machine device according to the first embodiment.

[0030] Figure 7 It is a front view of the rotating electrical machine device according to the first embodiment.

[0031] Figure 8 It is an enlarged view of a side cross section of a rotating electrical machine device according to the second embodiment, taken along the axis.

[0032] Figure 9 It is an enlarged view of a side cross section of a rotating electrical machine device according to Embodiment 3, taken along the axis.

[0033] Figure 10 It is a front view of the rotating electrical machine device according to the fourth embodiment.

[0034] Figure 11 An enlarged view of a side cross section along the axis of a rotating electrical machine device according to a fifth embodiment.

[0035] Figure 12 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device according to a sixth embodiment.

[0036] Figure 13 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device according to a seventh embodiment.

[0037] Figure 14 This is a circuit diagram of a rotating electrical machine device according to the eighth embodiment.

[0038] Figure 15 It is a side cross-sectional view of a rotating electrical machine device according to the eighth embodiment.

[0039] Figure 16 This is a first front view of the rotating electrical machine device according to the eighth embodiment.

[0040] Figure 17 This is a second front view of the rotating electrical machine device according to the eighth embodiment.

[0041] Figure 18 It is a structural diagram of an electric power steering device according to a ninth embodiment. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings.

[0043] 1. Implementation Method 1

[0044] Hereinafter, embodiment 1 will be described. Figure 1 This is a circuit diagram of the rotating electrical machine device 100 according to the first embodiment. Figure 2 It is a side cross-sectional view of the rotating electrical machine device 100 according to the first embodiment. Figure 3 It is a cross-sectional view of the upper surface of the rotating electrical machine device 100 according to the first embodiment. Figure 4 This is an enlarged view of a side cross section of the rotating electrical machine device 100 according to the first embodiment, taken along the axis. Figure 5 This is a first plan view of the electromagnetic shielding tool 37 of the rotating electrical machine device 100 according to the first embodiment. Figure 6 This is a second plan view of electromagnetic shielding tool 37 of rotating electrical machine device 100 according to Embodiment 1. Figure 7 It is a front view of the rotating electrical machine device 100 according to the first embodiment.

[0045] <Circuit Structure>

[0046] exist Figure 1 The circuit diagram of a rotating electric machine device 100 shows a control unit 1 and a rotating electric machine 2. Rotating electric machine device 100 can be a three-phase brushless rotating electric machine with a Y-connection or a delta-connection, integrated with a control circuit. It can also have the function of generating electricity by driving a load and using the regenerative power to charge a battery. Rotating electric machine device 100 is not only used in an electric power steering device 150 but can also be used in various applications, including driving vehicle wheels.

[0047] 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.

[0048] The filter unit 17 is connected to a power source from the vehicle's battery 6 and GND (ground). The power supply circuit 13 of the control circuit unit 4 is powered by 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 mounted 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. Power supplied by the signal from the power supply circuit 13, through the filter unit 17 and the power relay switching element 5, becomes the current source for the inverter circuit 3. The filter unit 17 is comprised of a normal mode coil 17a and capacitors 17b, 17c, and 17d. Depending on the noise generated by the rotating electrical machine device 100, a common mode coil (not shown) may be added or removed, and the number of capacitors may be increased or decreased.

[0049] 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 a control variable corresponding to the current that rotates the rotating electric machine 2 and outputs this control variable. The output signal from the CPU 10 is transmitted to the inverter circuit 3 via the drive circuit 11 that constitutes the output circuit. Because the drive circuit 11 only flows a small current, it is located within the control circuit unit 4 and is physically mounted on the control substrate 14 along with the CPU 10, power supply circuit 13, and input circuit 12. However, the drive circuit 11 may also be located within the power module 35 along with the inverter circuit 3.

[0050] 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 for connecting and disconnecting wiring to the rotating electrical machine windings. The inverter circuit 3 also includes shunt resistors 33U, 33V, and 33W for current detection and filter capacitors 30U, 30V, and 30W. Each phase winding has the same circuit configuration, enabling independent current supply to each phase winding.

[0051] Although not shown, the potential difference between the ends of the shunt resistors 33U, 33V, and 33W and the winding terminal voltage of the rotary 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 detected value and the calculated current value and, through feedback control, supplies the desired rotary electric machine current to operate the rotary electric machine.

[0052] The drive circuit 11 also outputs a drive signal for the power supply relay switching element 5. This power supply relay switching element 5 operates as a power line connecting and disconnecting the battery 6 and the inverter circuit 3. This switching element 5 can interrupt 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 and can interrupt each phase individually. Since the power supply relay switching element 5 also carries a large current and generates heat, it can be located in the power module 35 that includes the inverter circuit 3, rather than in the control board 14.

[0053] The CPU 10 has an abnormality detection function for detecting abnormalities in the sensors 8, drive circuit 11, inverter circuit 3, rotating electrical machine windings, and the like. If an abnormality is detected, the CPU 10, based on the abnormality, may, for example, shut off the current supply to a specific phase by opening 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 for that phase. Furthermore, the CPU 10 may shut off the entire current by opening the power supply relay switching element 5 to shut off the power supply at its source.

[0054] The rotating electric machine 2 is a three-phase brushless rotating electric machine with a delta connection. Since 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 the input circuit 12. Alternatively, instead of a three-phase delta connection, a Y connection can be used, or a two-pole, two-pair brushed rotating electric machine can be used. Furthermore, the winding specifications are the same as those of conventional devices, and either distributed winding or concentrated winding can be used.

[0055] Next, the filter unit 17 and its surroundings will be described. Switching noise is generated by PWM (Pulse Width Modulation) control of the inverter circuit 3 of the control unit 1. The filter unit 17 is provided to prevent the switching noise from being transmitted from the rotating electrical machine device 100 to the outside. Coil 17a is used for normal mode noise and is referred to as a normal mode coil. Although not shown, a coil referred to as a common mode coil may also be added to prevent common mode noise.

[0056] Capacitor 17b is called an inter-line capacitor or X-capacitor. 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 through a portion of rotating electrical machine device 100 and grounded.

[0057] <Physical Structure>

[0058] Figure 2 This is a side cross-sectional view for explaining the physical structure of the rotating electrical machine device 100 according to the first embodiment. The control unit 1 is cut along a cross section including the axis of the rotating electrical machine 2. The rotating electrical machine 2 is arranged at Figure 2 The control unit 1 is configured on the lower side of Figure 2 The upper side of the rotating motor 2 is adjacent to the output shaft 21 of the rotating motor 2 in the axial direction and is integrated with the rotating motor 2. As with conventional devices, the rotating motor 2 is housed in a rotating motor housing 25 and comprises a rotor and a stator. The rotor has multiple pole-pair permanent magnets (not shown) arranged around the output shaft 21. The stator is separated from the rotor by a gap and is wound with windings. The windings are wound in three phases, and the ends of each phase extend to the control unit 1 for connection (not shown).

[0059] The top and outer periphery of the control unit 1 are covered by a housing 40. A power connector 42 for the power supply system, which carries a relatively large current, and a signal connector 43 for the signal system, which carries a relatively small current, are located on the top of the housing. The power connector 42, signal connector 43, and housing 40 are integrally molded from a resin material.

[0060] Figure 3 This is a cross-sectional view of the upper surface of the rotating electrical machine device 100 according to Embodiment 1, showing the lower surface cut below the top surface of the electromagnetic shield 37 of the control unit 1 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.

[0061] A column portion 341 having a rectangular columnar 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 column portion 341 of the heat sink 34. The busbar unit 36 ​​is disposed on the other long side of the column portion 341 of the heat sink 34.

[0062] The power module 35 is arranged longitudinally along one side of the short side of the column portion 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 welding, and the terminals for connecting to the busbar unit are connected by TIG (Tungsten Insert Gas: tungsten inert gas) welding or the like. 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.

[0063] The heat sink 34 consists of the aforementioned column 341 and an annular base 342 fixed to one end of the column 341 in the longitudinal direction. The column 341 of the heat sink 34 is positioned in the center of the housing 40, with its longitudinal direction aligned with the axis of the housing 40 of the control unit 1. The outer circumference of the base 342 of the heat sink 34 is inscribed within the inner circumference of the rotating electrical machine housing 25 and supported by the rotating electrical machine housing 25. Specifically, the heat sink 34 is positioned such that its base 342 is fixed to the rotating electrical machine housing 25, and the column 341, cantilevered by the base 342, protrudes into the interior space of the housing 40.

[0064] 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 are connected to bus bars (not shown) of the bus bar unit 36 ​​of the control unit 1 through the insertion hole.

[0065] The base 342 of the heat sink 34 has a stepped shape. The rotating electrical machine housing 25 is fixed to the outer periphery of the larger diameter portion of the base 342. A cylindrical metal electromagnetic shield 37 for suppressing noise emission is fixed to the outer periphery of the smaller diameter portion of the base 342.

[0066] The electromagnetic shield 37 is configured to cover the column 341 of the heat sink 34, the control board 14, the busbar unit 36 ​​and the power module 35, and a portion of the control board 14 protrudes outside the electromagnetic shield through the through hole 371 in the upper portion of the electromagnetic shield. Figure 2 In the embodiment shown in FIG. 1 , 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 .

[0067] The busbar unit 36 ​​includes a busbar holder 362 that embeds a busbar 361 in a resin member, the filter capacitors 30U, 30V, and 30W, and the normal mode coil 17a. The busbar 361 is connected 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 filter capacitors 30U, 30V, and 30W, the normal mode coil 17a, and the power and ground terminals extending from the power connector 42.

[0068] Filter circuit

[0069] The control board 14 is mounted with Figure 1 The control circuit unit 4, the switching element 5 for the power supply relay, and the filter unit 17 are mounted on the control substrate 14. Circuit components of the inverter circuit 3 for controlling the current supplied to the rotating electric machine 2 are mounted on the control substrate 14. 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, the normal mode coil 17a is arranged in the busbar unit 36 ​​in the above description, but it can also be arranged on the protrusion 141. Since a dedicated substrate or circuit support structure for the filter circuit is not required, the control unit can be constructed in a compact and low-cost manner. Furthermore, these components are housed in the housing 40 for protection. When the components are housed in the housing 40, damage to the components can be avoided, making the rotating electrical machine device 100 easier to handle.

[0070] In this first embodiment, capacitor 17b (X capacitor) and capacitors 17c and 17d (Y capacitor) of the filter circuit are arranged on top of control board 14. This eliminates the need for a dedicated filter circuit board or circuit support structure, resulting in a compact and low-cost control unit. Furthermore, by providing filter unit 17 with noise-cancelling capabilities outside through-hole 371 of electromagnetic shield 37, effective noise reduction measures can be implemented. The X and Y capacitors of the filter circuit are grounded via electromagnetic shield 37, rather than via a heat sink that is close to the power module path, which is a noise source. This helps suppress noise.

[0071] Furthermore, the protrusion 141 is disposed in a recessed portion inside the convex portion 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, in 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, excluding the convex portion 40a, the power connector 42, the signal connector 43, and other convex portions, thereby successfully achieving miniaturization.

[0072] <Ground Bus>

[0073] Furthermore, an L-shaped ground bus bar 38 is disposed on the outer peripheral surface of the control substrate 14 and below the top surface of the electromagnetic shield 37 .

[0074] Figure 4 This is an enlarged side cross-section of the rotating electrical machine device 100 according to Embodiment 1, taken along the axis, illustrating the connection between the control board 14 and the electromagnetic shield 37. The ground 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 GND pattern 142 of the control board 14.

[0075] A hexagonal nut 39 is located below the portion of the grounding bus 38 that contacts the electromagnetic shield 37 and is supported by a resin holder 61. Screws 60a are tightened from above the upper surface of the electromagnetic shield 37, bringing the grounding bus 38 into close contact with the lower surface of the electromagnetic shield 37 and electrically connecting them. The hexagonal nut 39 is held in place by the resin holder 61 below the grounding bus 38, preventing it from rotating. Furthermore, the resin holder 61, which holds the hexagonal nut 39, is assembled to the grounding bus 38 by press-fitting or other means.

[0076] Starting from the top, assemble the electromagnetic shield 37, grounding busbar 38, and hexagonal nut 39 in order, tightening screw 60a from the top. This assembly prevents any obstructive protrusions above screw 60a when electrically connecting the electromagnetic shield 37 and grounding busbar 38. This eliminates the need to maintain 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.

[0077] The vertical surface of the ground busbar 38 is electrically connected to the GND pattern 142 on the control board 14 side. The GND pattern 142, along with the X capacitors 17b and Y capacitors 17c and 17d arranged on the control board, constitutes the filter unit 17. The surface of the ground busbar 38 that contacts the control board 14 is tightened from the outer periphery by screws 60b. The vertical portion of the resin holder 61, the vertical portion of the ground busbar 38, and the control board 14 are secured to the screw-fastening base 343 of the heat sink 34 by screws 60b. The ground busbar 38 and the GND pattern 142 of the filter unit 17 are electrically connected by tightening screws 60b. Since the filter unit 17 is formed by the GND pattern 142, a highly reliable and low-cost connection is possible.

[0078] Screw 60b is electrically connected to the heat sink 34 by screw fastening. However, because the resin holder 61 and the heat sink 34 side of the control board 14 are both insulated, the electromagnetic shield 37 and the GND pattern 142 of the control board 14 are not electrically connected to the screw 60b or the heat sink 34. The X capacitors 17b and Y capacitors 17c and 17d of the filter circuit are arranged on top of the control board 14, eliminating 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, 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 power module path and acts as a noise source. This helps suppress noise.

[0079] This structure is tightened from the outer circumference of the central axis of the rotating electrical machine using screws 60b, with the vertical surface of the grounding busbar 38 positioned on the outer circumference of the control board 14. As a result, the portion of the structure connecting the electromagnetic shield 37 to the grounding busbar 38 protrudes from the upper surface of the heat sink 34, eliminating wasted space and contributing to the miniaturization of the control unit 1.

[0080] <Electromagnetic shielding parts>

[0081] Figure 5 A first plan view of the electromagnetic shielding member 37 of the rotating electrical machine device 100 according to Embodiment 1 is shown. The upper surface of the electromagnetic shielding member 37 is provided with through-holes 371 through which the control board 14 projects and screw insertion holes 372 through which the screws 60 a pass.

[0082] Figure 6 FIG2 shows a second plan view of the electromagnetic shielding member 37 of the rotating electrical machine device 100 according to the first embodiment. Figure 5 The difference is that cutout holes 373 are provided around the screw insertion holes 372 to facilitate deformation of the electromagnetic shielding member 37. The shape of the electromagnetic shielding member 37 of the rotating electrical machine device 100 according to the first embodiment may include: Figure 5 、 Figure 6 The various shapes shown are diverse. Although not shown, other holes such as holes for positioning during assembly may also be provided. Furthermore, the through hole 371 may be enlarged so that a portion of the upper portion of the heat sink 34 or busbar unit 36 ​​protrudes beyond the electromagnetic shield 37.

[0083] Figure 7 It is a front view of the rotating electrical machine device 100 according to the first embodiment. Figure 7 This figure shows the control board 14 from the front, with the control unit housing 40 and the electromagnetic shield 37 removed. A ground busbar 38 connecting the control board 14 and the electromagnetic shield 37 is disposed in the center of the control board 14.

[0084] Figure 7 The double-dashed line portion indicated by arrow A in FIG. 1 shows the top surface of electromagnetic shielding member 37. Arrow B shows the position where screw 60b of control board 14 is screwed in. Arrow C shows the position where ground busbar 38 and electromagnetic shielding member 37 are connected by screw 60a.

[0085] exist Figure 7 In the embodiment, the axes of the screws 60a and 60b are arranged on the same plane including the axis of the rotating motor 2. With this arrangement, the screws 60a and 60b can fix the control substrate 14 and the electromagnetic shielding member 37 together. Figure 7 The horizontal center of the structure is located in the horizontal direction, which is advantageous in terms of vibration resistance and durability.

[0086] exist Figure 4 and Figure 7 In the embodiment, screws 60a are arranged perpendicular to the top surface of electromagnetic shielding member 37. Screws 60b are arranged perpendicular to control board 14. Thus, by arranging screws 60a and 60b perpendicular to the object to be fixed, the object can be securely fixed without loosening, which is very significant and advantageous in terms of vibration resistance and durability.

[0087] 2. Implementation Method 2

[0088] Figure 8 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device 101 according to the second embodiment.

[0089] Compared with the embodiment 1 Figure 4 The difference is that the hexagonal nut 39 is not used to fix the screw 60a. Instead, the ground busbar 381 is deburred and threaded to form an internal thread portion 381a. The internal thread portion 381a is provided on the ground busbar 381, and the electromagnetic shielding member 37 and the ground busbar 381 are connected using the screw 60a.

[0090] exist Figure 8In the embodiment, resin holder 611, which accommodates the tip of screw 60a, is positioned below ground bus 381. Similar to Embodiment 1, resin holder 611 also extends between ground bus 381 and control board 14, on the side where screw 60b is fastened. Screw 60b serves as an insulating material when fastening ground bus 381 and control board 14 to heat sink 34. Resin holder 611 is attached to ground bus 381 by press-fitting or the like.

[0091] In this way, the electromagnetic shielding member 37 can be electrically connected to the ground bus bar 381 without using the hexagonal nut 39 and can be configured at a lower cost.

[0092] 3. Implementation Method 3

[0093] Figure 9 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device 102 according to the third embodiment.

[0094] Compared with the embodiment 1 Figure 4 The difference is that a grounding strap 382 that maintains electrical connection by welding and crimping is provided instead of the grounding strap 38 fixed by screws 60a and 60b.

[0095] When connecting to the control board 14, the ground busbar 382 is surface-mounted on the control board 14, connected to the GND pattern 142 of the filter unit 17, using reflow soldering. Electrical connection to the electromagnetic shield 372 is achieved when the control board 14 is assembled to the heat sink 34, with the inner side of the upper surface of the electromagnetic shield 372 abutting against the ground busbar 382 while it is bent. This eliminates the need for screws 60a, 60b, and the resin holder 61, reducing the number of components. This contributes to cost reduction.

[0096] In the third embodiment, a leaf spring-shaped elastic member that can be mounted on the control board 14 may be used as the ground busbar 382. By using a leaf spring-shaped elastic member, the ground busbar 382 can be more reliably electrically connected to the electromagnetic shield 372 by utilizing flexibility and repulsive force.

[0097] 4. Implementation Method 4

[0098] Figure 10 It is a front view of a rotating electrical machine device 103 according to the fourth embodiment.

[0099] Figure 10 This figure shows the control board 143 from the front, with the control unit housing 40 and the electromagnetic shield 37 removed. A ground busbar 383 connecting the control board 143 and the electromagnetic shield 37 is disposed near the center of the control board 143.

[0100] Figure 10The double-dashed line portion indicated by arrow A in FIG. 1 shows the top surface of electromagnetic shielding member 37. Arrow B shows the position where screw 60b is screwed into control board 143. Arrow C shows the position where ground busbar 383 is connected to electromagnetic shielding member 37 by screw 60a.

[0101] exist Figure 10 In the embodiment, the axis of screw 60a is arranged on a first plane parallel to the axis of rotating electric machine 2, and the axis of screw 60b is arranged on a second plane parallel to the first plane. With this arrangement, screws 60a and 60b can fix control board 14 and electromagnetic shielding member 37 together.

[0102] Thus, even if the position of the screw 60b is not Figure 10 The screw 60b can also be connected to the ground bus 383 at the center of the horizontal direction of the control substrate 143. Similarly, the position of the screw 60a is Figure 10 Even if the position of the control board 143 deviates from the horizontal center, it is not a problem. This is because the control board's GND pattern 142 and the electromagnetic shield 37 can be connected via the ground busbar 383. Adjusting the position of screws 60a and 60b increases design flexibility, making it easier to avoid collisions with other components. This contributes to the miniaturization and cost reduction of the rotating electrical machine device 103.

[0103] 5. Implementation Method 5

[0104] Figure 11 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device 104 according to the fifth embodiment.

[0105] Figure 11 Compared with the embodiment 1 Figure 4 The difference lies in the fact that coil 17a is provided on protrusion 141 of control board 14. Coil 17a, together with X capacitor 17b and Y capacitors 17c and 17d arranged on the control board, constitute filter unit 17. Therefore, by placing the components constituting filter unit 17 on protrusion 141 of control board 14, noise can be reduced by filter unit 17 after it has been absorbed by electromagnetic shield 37.

[0106] 6. Implementation Method 6

[0107] Figure 12 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device 105 according to the sixth embodiment.

[0108] Compared to the first embodiment Figure 4 , Figure 12Part or all of X capacitors 17b, Y capacitors 17c, and 17d mounted on protrusion 141 of control board 14 are positioned on the surface outside through-hole 371 of electromagnetic shield 37, where they contact the side surfaces of the capacitors. This placement of capacitors, which are components of filter unit 17, significantly reduces noise immediately after electromagnetic shield 37 absorbs it, enabling the filter unit to reduce noise.

[0109] 7. Implementation Method 7

[0110] Figure 13 It is an enlarged view of a side cross section along the axis of a rotating electrical machine device 106 according to the seventh embodiment.

[0111] Figure 13 With respect to the sixth embodiment Figure 12 The difference is that part or all of X capacitors 17b, Y capacitors 17c, and 17d mounted on protrusion 141 of control board 14 are positioned so as to straddle the surface outside through-hole 371 of electromagnetic shield 37. This placement of capacitors as components of filter unit 17 significantly reduces noise immediately after electromagnetic shield 37 absorbs it.

[0112] 8. Implementation Method 8

[0113] Figure 14 This is a circuit diagram of a rotating electrical machine device 107 according to the eighth embodiment. Figure 15 It is a side cross-sectional view of a rotating electrical machine device 107 according to the eighth embodiment. Figure 16 This is a first front view of the rotating electrical machine device 107 according to the eighth embodiment. Figure 17 This is a second front view of the rotating electrical machine device 107 according to the eighth embodiment.

[0114] The rotating electrical machine device 107 according to the eighth embodiment is configured such that control circuits, connectors, sensors, and the like have two completely independent control systems to ensure redundancy. Figure 14 This is a diagram showing two common circuits involved in the eighth embodiment. Figure 1 There are two electrical systems described in the electrical system.

[0115] The following describes the rotating electrical machine device 107 according to the eighth embodiment. Figure 15 The housing 400 covers the upper portion and outer periphery of the control unit 111. Power connectors 42a and 42b, through which high currents flow, and signal connectors 43a and 43b, through which low currents flow, are located on the upper portion of the housing 400. The power connectors 42a and 42b, signal connectors 43a and 43b, and the housing 400 are integrally molded from a resin material.

[0116] In the control unit 111, a heat sink 345 is disposed in the center of the housing 400. A columnar portion 346 having a rectangular columnar cross section is disposed in the center of the heat sink 345. A control board 41a is disposed longitudinally along one side of the cross section of the columnar portion 346 of the heat sink 345, which is on the long side. A control board 41b is disposed longitudinally along the other side of the cross section of the columnar portion 346 of the heat sink 345, which is on the long side.

[0117] The busbar unit 36a is arranged on the outer peripheral side of the control substrate 41a. The busbar unit 36b is arranged on the outer peripheral side of the control substrate 41b. The power module 35a is longitudinally arranged along one side of the short side of the cross section of the column portion 346 of the heat sink 345 at the position of the double-dotted line indicated by the arrow E, and the power module 35b is longitudinally arranged along the other side. Although not shown in the figure, the power modules 35a and 35b have terminals for connecting to the control substrate on one side of the short side direction of the cross section of the column portion 346 of the heat sink 345, and terminals for connecting to the busbar unit on the other side. The terminals for connecting to the control substrate are connected by welding, and the terminals for connecting to the busbar unit are connected by TIS welding, etc.

[0118] As in the first embodiment, the base 342 of the heat sink 345 is provided with an electromagnetic shield 375. The upper portions of the control boards 41a and 41b protrude from the electromagnetic shield 375 through through-holes 374 provided in the upper portion of the electromagnetic shield, forming protrusions 41c and 41d. The X capacitors 17b and Y capacitors 17c and 17d are disposed on the protrusions 41c and 41d, respectively.

[0119] The outer circumferences of the control boards 41a and 41b are provided with a ground busbar 38, a resin holder 61, a hexagonal nut 39, screws 60a, and screws 60b, respectively. By fastening the electromagnetic shielding member 375 with the screws, the GND pattern (not shown) of each filter unit 17 of the control boards 41a and 41b is connected to the electromagnetic shielding member 375. This is the same connection method as in the first embodiment, but the same connection method as in the second and third embodiments may also be used.

[0120] Figure 16 This is a first front view of the rotating electrical machine device 107 according to the eighth embodiment. Figure 17 : This is a second front view of the rotating electrical machine device 107 according to the eighth embodiment. The double-dashed line indicated by the arrow F indicates the position of the upper surface of the electromagnetic shielding member 375. The portion surrounded by the double-dashed line indicated by the arrow G is a diagram showing the position of the busbar unit 36a. Figure 15 、 16 As shown in FIG. 17 , the bus bar unit 36 ​​a is spaced apart from a screw fastening portion of the ground bus bar 38 or 384 on the control board 41 a side indicated by an arrow H. As shown in FIG.

[0121] By arranging the ground busbar 38 or 384 and the busbar unit 36a in three dimensions in this manner, the space required for arranging the ground busbar 38 or 384 can be reduced, and the control unit 111 can be miniaturized. Figure 16 As shown, the screw fastening portion on the control substrate 41a side indicated by the arrow H and the screw fastening portion on the electromagnetic shielding member 37 side indicated by the arrow I may also be located similarly to the first embodiment. Figure 16 The control substrates 41a and 41b are positioned at the center of the horizontal direction. Figure 17 As shown, it can be Figure 17 Furthermore, the busbar unit 36b on the control substrate 41b side may also be configured in the same manner. Figure 16 、 Figure 17 Arrow G in the figure shows that the busbar units 36a and 36b are arranged so as to avoid the structures connecting the grounding busbars 38 and 384 to the control boards 41a and 41b and the electromagnetic shield 375. This arrangement allows the connection structure of the grounding busbars 38 and 384 to be arranged without interfering with the busbar units 36a and 36b, which contributes to the reduction in size and cost of the rotating electrical machine device 107.

[0122] 9. Implementation Method 9

[0123] Figure 18 1 is a configuration diagram of an electric power steering device 150 according to Embodiment 9. 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.

[0124] Figure 18 1 is an overall structural diagram of an electric power steering device 150, which 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 a steering wheel 151, a torque sensor 152 detects the steering torque and outputs it to the rotating electric machine device 100. In addition, a speed sensor 153 detects the vehicle's running speed and outputs it to the rotating electric machine device 100. The rotating electric machine device 100 generates an assist torque to assist the steering torque based on inputs from the torque sensor 152 and the speed sensor 153, and supplies the assist torque 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 .

[0125] By miniaturizing the rotating electrical machine device 100 used in the electric power steering system 150, vehicle mountability is improved. Cost reduction of the rotating electrical machine device 100 also contributes to overall cost reduction of the electric power steering system 150. The same applies when the rotating electrical machine devices 101 to 107 are used in place of the rotating electrical machine device 100.

[0126] Although this application describes various exemplary embodiments and examples, the various features, methods, and functions described in one or more embodiments are not limited to the application of specific embodiments and can be applied to the embodiments individually or in various combinations. Therefore, it can be considered that countless variations not illustrated are also included in the technical scope disclosed in this application specification. For example, it is set to include the case where at least one component is deformed, added, or omitted, and the case where at least one component is extracted and combined with the components of other embodiments.

[0127] Description of labels

[0128] 1 Control unit, 2 Rotating motor, 14, 41a, 41b, 143 Control substrate, 17 Filter unit, 17a Coil, 17b, 17c, 17d Capacitor, 34 Heat sink, 37, 375 Electromagnetic shield, 38, 381, 382, ​​383 Ground busbar, 39 Hexagonal nut, 40 Housing, 41c, 41d, 141 Protrusion, 21 Output shaft, 60a, 60b Screw, 61 Resin holder, 100, 101, 102, 103, 104, 105, 106 Rotating motor unit, 142 GND pattern, 150 Electric power steering unit, 371 Through hole.

Claims

1. A rotating electrical machine device, characterized in that: include: a rotating electric machine having a rotating shaft; a control unit provided on an opposite side of an output side of the rotating shaft in an axial direction relative to the rotating electric machine and configured to control the rotating electric machine; a control substrate provided in the control unit and arranged parallel to the axial direction of the rotating shaft, the control substrate having a protrusion extending toward a side opposite to an output side in the axial direction of the rotating shaft; an electromagnetic shielding member surrounding the control unit and provided with a through hole through which the protruding portion of the control substrate passes; an external connection terminal disposed outside the electromagnetic shield and mounted on the protruding portion of the control substrate; as well as A filter is disposed outside the electromagnetic shield and mounted on the protruding portion of the control board to attenuate noise components propagating toward the external connection terminals.

2. The rotating electrical machine according to claim 1, wherein: The control substrate has a wiring pattern connected to the filter and the external connection terminal, A ground busbar electrically connected to the wiring pattern of the control substrate and the electromagnetic shielding member is provided.

3. The rotating electrical machine device according to claim 2, wherein: including a first screw, a heat sink and a resin member, The control substrate, the ground busbar, and the resin member are fastened to the heat sink by first screws. The wiring pattern of the control substrate and the ground bus bar are electrically connected.

4. The rotating electrical machine device according to claim 3, wherein: The heat sink is arranged on the axis side of the rotating electric machine, the control substrate is arranged on the outer peripheral side of the heat sink, the ground bus bar is provided on the outer peripheral side of the control substrate, and the resin member is arranged on the outermost peripheral side.

5. The rotating electrical machine according to any one of claims 2 to 4, wherein: Including the second screw, The electromagnetic shielding member is fastened to the ground busbar by the second screw. The ground busbar is electrically connected to the electromagnetic shielding component.

6. The rotating electrical machine device according to any one of claims 2 to 4, characterized in that: Including the second screw and nut, The ground busbar and the electromagnetic shielding member are fastened by the nut and the second screw, The ground busbar is electrically connected to the electromagnetic shielding component.

7. The rotating electrical machine according to claim 5, wherein: The electromagnetic shield is arranged on the opposite side of the output side in the axial direction of the rotating shaft with respect to the ground bus bar.

8. The rotating electrical machine according to claim 2, wherein: The ground busbar is fixed to the wiring pattern of the control substrate by solder and is press-bonded to the electromagnetic shielding member, and is electrically connected to the wiring pattern of the control substrate and the electromagnetic shielding member.

9. The rotating electrical machine device according to claim 8, wherein: The ground busbar is a leaf spring-shaped elastic member.

10. The rotating electrical machine device according to any one of claims 1 to 4, characterized in that: include: First screw; Second screw; as well as a ground busbar mounted on the control substrate by the first screw and mounted on the electromagnetic shielding member by the second screw, The axis of the first screw and the axis of the second screw are arranged on the same plane including the axis of the rotating electrical machine.

11. The rotating electrical machine device according to any one of claims 1 to 4, characterized in that: include: First screw; Second screw; as well as a ground busbar mounted on the control substrate by the first screw and mounted on the electromagnetic shielding member by the second screw, The axis of the first screw is arranged on a first plane parallel to the axis of the rotating electrical machine, and the axis of the second screw is arranged on a second plane parallel to the first plane.

12. The rotating electrical machine according to claim 10, wherein: The axis of the first screw is arranged perpendicularly to the control substrate, and the axis of the second screw is arranged perpendicularly to the electromagnetic shielding member.

13. The rotating electrical machine device according to any one of claims 2 to 4, characterized in that: The bus bar is provided with a bus bar spaced apart from the mounting portion of the control board and the ground bus bar and arranged in parallel with the control board, and has large components mounted thereon.

14. The rotating electrical machine device according to any one of claims 1 to 4, characterized in that: A housing is included, the housing accommodating the protruding portion of the control substrate and the external connection terminal connected to the protruding portion and covering the outside of the electromagnetic shielding member to protect internal components.

15. The rotating electrical machine device according to claim 14, wherein: The housing has a convex portion, and the protruding portion of the control substrate is housed inside the convex portion of the housing.

16. The rotating electrical machine device according to any one of claims 1 to 4, characterized in that: The filter mounted on the protruding portion of the control substrate is a capacitor.

17. The rotating electrical machine device according to any one of claims 1 to 4, characterized in that: The filter mounted on the protruding portion of the control substrate is a capacitor and a coil.

18. The rotating electrical machine according to claim 16, wherein: The capacitor is provided at a position where a side surface of the capacitor contacts a surface of the protruding portion of the control substrate that is located outside the through hole provided in the electromagnetic shield.

19. The rotating electrical machine according to claim 16, wherein: The capacitor is provided at a position straddling a surface of the protruding portion of the control substrate that is located outside the through hole provided in the electromagnetic shield.

20. An electric power steering device, characterized in that: The rotary electric machine device comprises the rotary electric machine device according to any one of claims 1 to 19.

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