Rotating electric machine device and electric power steering device

Abstract

A rotating electric machine device (100) includes a rotating electric machine (2) having a winding (25) and an output shaft (22), a power module (5a, 5b) having switching elements (14, 15, 16) connected to the winding (25), a bus bar (40a, 40b) held by a bus bar holder (41a, 41b) and constituting a power supply providing path to the power module (5a, 5b), a plurality of smoothing capacitors (18) connected to the bus bar (40a, 40b), and a capacitor holder (44a, 44b) that arranges the plurality of smoothing capacitors (18) in an axial direction of the rotating electric machine (2) on a radially outer side closer to the rotating electric machine (2) than the bus bar holder (41a, 41b), and holds the plurality of smoothing capacitors (18) from an outer circumferential side of the rotating electric machine (2).

Description

Technical Field

[0001] This application relates to rotary electric motor devices and electric power steering devices. Background Technology

[0002] In a drive device that integrates a rotary motor and a control unit coaxially with the output shaft of a conventional rotary motor, the stator, rotor, etc., are built into the housing of the rotary motor, and the control unit is assembled in a stacked manner in the vicinity of the stator. In addition, there is a device with a structure in which a power module having a built-in switching element that supplies current to the rotary motor and a control board are erected parallel to the axial direction of the output shaft (Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-163416 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] The existing device disclosed in Patent Document 1 is a structure that integrates the control unit with the motor end opposite to the output side of the motor output shaft (hereinafter referred to as the reverse output side). When considering installing such an integrated device into a vehicle, due to vehicle installation limitations, it is generally difficult to mount the control unit into the vehicle if it is extended radially towards the motor. On the other hand, even if the length in the direction of the motor output shaft is relatively long, it is generally permissible. Therefore, the radial area of ​​the control unit must be equal to or smaller than that of the motor. In addition, especially in the case of electric power steering systems where both the motor windings and the motor drive circuit have two sets independently, in order to accommodate large components such as power modules and smoothing capacitors without increasing the radial area of ​​the control unit, careful consideration must be given to the shape and arrangement of the busbars connecting them.

[0008] Therefore, in the existing control unit disclosed in Patent Document 1, the power module and control board are upright parallel to the output shaft direction, and a bus unit is disposed adjacent to the surface of the heat sink. This bus unit holds the bus for supplying power to the power module from the outside. In addition, multiple smoothing capacitors are mounted on the surface on which the bus unit is mounted and electrically connected to the bus, wherein the smoothing capacitors smooth the drive power supplied from the external power source to reduce noise.

[0009] However, Patent Document 1 does not mention a retaining structure for the smoothing capacitor. When the smoothing capacitor is held solely by the connection between its terminals and the busbar, significant vibration occurs when the electric power steering system is subjected to impacts or vibrations, leading to deterioration of the connection between the terminals and the busbar and poor connection of the smoothing capacitor. Therefore, a structure is needed to maintain high vibration resistance while retaining the smoothing capacitor without compromising assemblability.

[0010] The rotary electric motor device involved in this application was made to solve the problems of the aforementioned existing devices. Furthermore, while Patent Document 1 also describes a motor (electric motor), the same principle applies to rotary electric motors that include both electric motors and generators.

[0011] The purpose of this application is to provide a rotary electric motor device that integrates a control device and a rotary electric motor, offering high vibration resistance and excellent product assemblability. Furthermore, an electric power steering device with high vibration resistance and excellent product assemblability will also be provided.

[0012] Technical means for solving technical problems

[0013] The rotary electric motor device involved in this application includes:

[0014] A rotary motor with windings and an output shaft;

[0015] A power module having a switching element connected to a winding;

[0016] The busbar, held by a busbar retainer, forms a power supply path to the power module;

[0017] Multiple smoothing capacitors connected to the busbar;

[0018] A capacitor holder that arranges multiple smooth capacitors radially outward from the rotating motor along the axial direction of the rotating motor, closer to the rotating motor than a busbar holder, and holds them from the outer peripheral side of the rotating motor.

[0019] The electric power steering device involved in this application includes the aforementioned rotary motor device.

[0020] Invention Effects

[0021] The rotary electric motor device and electric power steering device involved in this application can provide devices with high vibration resistance and excellent product assemblability. Attached Figure Description

[0022] Figure 1 This is a circuit diagram of the rotary motor device according to Embodiment 1.

[0023] Figure 2 This is a cross-sectional view of the rotary electric motor device according to Embodiment 1.

[0024] Figure 3 This is a top perspective view of the rotary electric motor device according to Embodiment 1.

[0025] Figure 4 This is an internal view of the capacitor holder of the rotary motor device according to Embodiment 1.

[0026] Figure 5 This is an external view of the capacitor holder of the rotary motor device according to Embodiment 1.

[0027] Figure 6 This is an internal view of the rotating motor device according to Embodiment 1, where a capacitor is mounted on the capacitor holder.

[0028] Figure 7 This is an external view of the capacitor holder of the rotary motor device according to Embodiment 1, on which the capacitor is mounted.

[0029] Figure 8 This is an inner view of the latch portion of the capacitor holder of the rotary motor device according to Embodiment 1.

[0030] Figure 9 This is an external view of the busbar retainer of the rotating electric machine according to Embodiment 1.

[0031] Figure 10 This is a circuit diagram of the rotary motor device involved in Embodiment 2.

[0032] Figure 11 This is a cross-sectional view of the rotary electric motor device according to Embodiment 2.

[0033] Figure 12 This is a top perspective view of the rotary motor device according to Embodiment 2.

[0034] Figure 13 This is a cross-sectional view of the rotary electric motor device according to Embodiment 3.

[0035] Figure 14 This is a top perspective view of the rotary electric motor device according to Embodiment 3.

[0036] Figure 15 This is an inner view of the capacitor holder of the rotary motor device according to Embodiment 3.

[0037] Figure 16 This is an external view of the capacitor holder of the rotary motor device according to Embodiment 3.

[0038] Figure 17 This is an inner view of the rotating motor device according to Embodiment 3, in which a smooth capacitor is mounted on the capacitor holder.

[0039] Figure 18 This is an external view of the rotating motor device according to Embodiment 3, showing the smooth capacitor mounted on the capacitor holder.

[0040] Figure 19 This is an external view of the busbar retainer of the rotary electric machine according to Embodiment 3.

[0041] Figure 20 This is a structural diagram of the electric power steering device involved in Embodiment 4. Detailed Implementation

[0042] 1. Implementation Method 1

[0043] Hereinafter, the rotary motor device 100 according to Embodiment 1 of this application will be described with reference to the accompanying drawings. Figure 1 This is a circuit diagram of the rotary motor device 100 according to Embodiment 1. Figure 2 This is a cross-sectional view of the rotary motor device 100 according to Embodiment 1. Figure 3 This is a top perspective view of the rotary motor device 100 according to Embodiment 1. Figure 4 This is an inner view of the capacitor holders 44a and 44b of the rotary motor device 100 according to Embodiment 1. Figure 5 This is an external view of the capacitor holders 44a and 44b of the rotary motor device 100 according to Embodiment 1. Figure 6 This is an internal view of the rotating motor device 100 according to Embodiment 1, in which a smoothing capacitor 18 is mounted on the capacitor holders 44a and 44b. Figure 7 This is an external view of the rotating motor device 100 according to Embodiment 1, on which a smoothing capacitor 18 is mounted on the capacitor holders 44a and 44b. Figure 8 This is an external view of the inner side of the latching portion 59 of the capacitor holders 44a and 44b of the rotary motor device 100 according to Embodiment 1. Figure 9 This is an external view of the busbar retainers 41a and 41b of the rotary electric motor device 100 according to Embodiment 1.

[0044] <Circuit Structure>

[0045] Figure 1This is a circuit diagram of the rotary motor device 100. Here, an example of the rotary motor device 100 being applied to an electric power steering system is shown. 1a and 1b are control units, and 2 is a rotary motor having two sets of three-phase windings. Control units 1a and 1b have the same structure and are equipped with substantially the same components, therefore one of them will be described.

[0046] The control unit 1a mainly consists of a control circuit section 4a equipped with a CPU 3a, a power module 5a having an inverter circuit that supplies current to the rotary motor 2, a power relay switching element 6a, and a filter 7a. The power supply +B and GND are connected to the battery 8 mounted on the vehicle. Power is supplied via the power circuit 10a of the control circuit section 4a through the ignition switch 9. Additionally, information is input from sensor type 11, such as a torque sensor that detects steering torque mounted near the steering wheel and a speed sensor that detects vehicle speed.

[0047] Information from sensor 11 is transmitted to CPU 3a via input circuit 12a of control circuit section 4a. CPU 3a calculates based on this information and outputs a control quantity, i.e., a current value, to rotate the rotary motor 2. This output signal is transmitted to power module 5a, which has an inverter circuit, via drive circuit 13a, which constitutes the output circuit. In the output circuit, drive circuit 13a receives command signals from CPU 3a and outputs drive signals for driving the switching elements of power module 5a.

[0048] Since the drive circuit 13a carries only a small current, it is installed in the control circuit section 4a. However, it can also be configured in the power module 5a. The power module 5a includes switching elements for the three-phase U-winding, V-winding, and W-winding of the rotary motor 2. The power module 5a mainly consists of upper arm switching elements 14Ua, 14Va, and 14Wa, lower arm switching elements 15Ua, 15Va, and 15Wa, rotary motor relay switching elements 16Ua, 16Va, and 16Wa for connecting / disconnecting wiring to the rotary motor windings, shunt resistors 17Ua, 17Va, and 17Wa for detecting current, and smoothing capacitors 18Ua, 18Va, and 18Wa for suppressing noise.

[0049] Below, for the upper arm switching elements 14Ua, 14Va, and 14Wa, the portion of control unit 1b is also included, and they are referred to as switching element 14. For the lower arm switching elements 15Ua, 15Va, and 15Wa, the portion of control unit 1b is also included, and they are referred to as switching element 15. For the rotating motor relay switching elements 16Ua, 16Va, and 16Wa, the portion of control unit 1b is also included, and they are referred to as switching element 16. In addition, for the smoothing capacitors 18Ua, 18Va, and 18Wa, the portion of control unit 1b is also included, and they are collectively referred to as smoothing capacitor 18.

[0050] Each phase winding has the same circuit structure, and power module 5a can independently supply current to each phase winding. Additionally, the ○ markings in the figure indicate connection terminals that connect to the external phases of control units 1a and 1b.

[0051] Furthermore, the potential difference between the shunt resistors 17Ua, 17Va, and 17Wa, and the voltage at the terminals of the rotating motor windings are also transmitted to the input circuit 12a. This information is also input to the CPU 3a, which calculates the difference between the detected values ​​and the calculated current values, and performs feedback control. The control unit 1a can provide the desired rotating motor current and assist in steering force. In addition, a drive signal is output to the power relay switching element 6a, which operates as a relay connecting / disconnecting the power supply to the battery +B and the power module 5a, and the current supply to the rotating motor 2 can be cut off by the switching element 6a.

[0052] Switching elements 16Ua, 16Va, and 16Wa for the rotating electric machine relay are also provided in the power module 5a, enabling them to disconnect each phase individually. Furthermore, since the power relay switching element 6a carries a large current and generates heat, it can also be included in the power module 5a, forming part of it. Additionally, a filter 7a, consisting of smoothing capacitors 60a and 61a and a coil 62a, is positioned near the power supply (+B, GND) to suppress noise generated by the PWM drive of the power module 5a.

[0053] The control circuit section 4a has an anomaly detection function that detects anomalies in the drive circuit 13a, power module 5a, rotary motor windings, etc., other than the sensor type 11, based on the input information. When an anomaly is detected, it shuts off, for example, the upper arm switching elements 14Ua, 14Va, 14Wa, the lower arm switching elements 15Ua, 15Va, 15Wa, and the rotary motor relay switching elements 16Ua, 16Va, 16Wa for that phase in order to cut off the current supply to only a specified phase. Alternatively, it can shut off the power relay switching element 6a to cut off the power supply itself at the source.

[0054] The above describes control unit 1a, but the same applies to control unit 1b; therefore, descriptions of the various parts of control unit 1b will be omitted. Furthermore, the CPU 3a of control unit 1a and the CPU 3b of control unit 1b are connected via communication line 19 to exchange information, especially in the event of an anomaly detection, allowing them to communicate and share information.

[0055] <Rotating Electric Machine>

[0056] Rotary motor 2 is a brushless rotary motor with three-phase, two-set windings connected in a delta configuration. It is equipped with rotation sensors 20a and 20b for detecting the rotational position of the rotor in order to function as a brushless rotary motor. Each of the rotation sensors 20a and 20b is equipped with two sets of sensors to ensure redundancy, and their rotational information is transmitted to the input circuits 12a and 12b of the control circuit sections 4a and 4b, respectively.

[0057] Furthermore, the brushless rotary motor can be configured not as a three-phase delta-connected motor, but also as a star-connected motor, or a two-pole, two-pair brushed rotary motor. The winding specifications are the same as in conventional devices, and distributed winding and concentrated winding can also be used. Additionally, it can be a so-called series-connected rotary motor with two stators. Whether it has only one set of windings or two sets working in tandem, as long as the structure can output the desired rotary motor speed and torque, it is acceptable. As mentioned above, the circuit network, connectors, sensors, etc., are all in two independent sets to ensure redundancy.

[0058] Figure 2 This is a cross-sectional view of a rotary motor device 100 used in an electric power steering system, where 1 is a control unit and 2 is a rotary motor. In such an integrated device, the maximum external dimensions of the control unit 1 need to be the same as or smaller than those of the rotary motor 2. Therefore, a structure in which the main components are parallel to the output shaft and upright is adopted.

[0059] First, use Figure 2 The structure of the rotary electric motor 2 will be described. The rotary electric motor 2 mainly consists of an output shaft 22, a rotor 23, and a stator 24, which are built into the housing 21.

[0060] The stator 24 is configured to have a multi-phase, for example, three-phase, winding 25 wound. A ring-shaped wiring portion 26, extending towards the control unit 1 and connecting the ends of this winding 25, is located near the upper part of the winding 25. Furthermore, the winding ends 27a and 27b of the rotary motor extend from the ring-shaped wiring portion 26 through the frame 28 into the control unit 1. The two sets of winding ends 27a and 27b, each consisting of three strands, extend towards the outer periphery of the control unit 1. Multiple pairs of permanent magnets are arranged around the rotor 23. Additionally, bearings 29a and 29b, used to rotate the output shaft 22, are located at the top and bottom of the figure. Figure 2The bearing 29a, located near the control unit 1, is positioned at the center of the frame 28, which forms the boundary between the rotary motor 2 and the control unit 1 and serves as a cover for the rotary motor 2. Additionally, the sensor rotor 30, described later, is positioned at the end of the output shaft 22 on the reverse output side.

[0061] <Control Unit>

[0062] Next, the structure of control unit 1 will be described. Control unit 1 consists of control units 1a and 1b of two systems, and its outer layer is covered by housing 31. On the end face opposite to the output side, there are power connectors 32a and 32b for connecting to an external power source (battery 8), and multiple signal connectors 33a and 33b for connecting to sensor type 11. On the same surface opposite to the output shaft 22 and perpendicular to the output shaft, where power connectors 32a and 32b and signal connectors 33a and 33b are arranged, filters 7a and 7b, etc., which are larger components, are mounted.

[0063] Power connectors 32a and 32b are for power systems through which larger currents flow, while signal connectors 33a and 33b are for signal systems through which smaller currents flow. Furthermore, the connectors comprise two sets: one for the power system and one for the signal system; however, one set of connectors can be branched into two sets within the control unit.

[0064] The column portion of the heat sink 34 is positioned at the center inside the housing 31. Control circuit sections 4a and 4b, power modules 5a and 5b forming the inverter circuit, etc., are positioned around the heat sink 34. The lower portion 34a of the heat sink 34 forms a circle that is inscribed within the housing 21 of the rotary motor 2. The reverse output end of the output shaft 22 extends from this center and is fitted with a sensor rotor 30.

[0065] The sensor rotor 30 is one or more pairs of magnet rotors, with rotation sensors 20a and 20b mounted on the circuit board 35 on their opposite sides. The sensor rotor 30 rotates by the rotation of the output shaft 22, thereby causing a change in the magnetic field. The rotation sensors 20a and 20b independently detect the change in the magnetic field. Two sets of rotation sensors 20a and 20b can be integrated into a single package. Figure 2 The structure of an encapsulation is shown.

[0066] The power and signal lines of the rotation sensors 20a and 20b are connected to the control circuit sections 4a and 4b respectively, positioned on the left and right sides of the circuit board 35 via the wiring pattern of the circuit board 35. An opening is made in the lower part of the heat sink 34, and the circuit board 35 is fixed within it. Therefore, its area is smaller than that of the control circuit sections 4a and 4b. The sensor rotor 30 and the rotation sensors 20a and 20b are described as magnetic sensors, but are not limited to this type; they could be rotary transformers or Hall effect sensors.

[0067] Figure 3 A perspective view of the main parts as seen from the power connectors 32a and 32b is shown. Figure 3 This is a top-down perspective view. A heat sink 34, roughly rectangular in shape, is positioned in the center, and control circuit sections 4a and 4b are arranged along two parallel sides. Power modules 5a and 5b are closely arranged on the two adjacent sides. The two sets of control circuit sections 4a and 4b and power modules 5a and 5b are separated and independently configured.

[0068] To connect the signal terminals 36a and 36b of the power modules 5a and 5b to the control circuit sections 4a and 4b, the control circuit sections 4a and 4b have a shape that extends to one side. The heat sink 34, the control circuit sections 4a and 4b are arranged approximately symmetrically with the output shaft 22 as the center point, and can be connected to the three-phase winding ends 27a and 27b of the rotary motor 2 in any one of them.

[0069] The terminals U, V, and W of the winding ends 27a and 27b are respectively arranged along the outer periphery of the control circuit sections 4a and 4b (terminals U, V, and W are not shown in the figure). The winding ends 27a and 27b are connected to the output terminals 38a and 38b of the power modules 5a and 5b via extension terminals 37a and 37b.

[0070] Additionally, bus units 39a and 39b are mounted on the surface of heat sink 34, where control circuit sections 4a and 4b are installed. Bus units 39a and 39b consist of power system buses 40a and 40b, extension terminals 37a and 37b, and bus holders 41a and 41b that hold them. Power system buses 40a and 40b are buses connected to the power supply and GND.

[0071] Power cables 42a and 42b are electrically connected from power connectors 32a and 32b to control circuit sections 4a and 4b. Various signal cables 43a and 43b are electrically connected from signal connectors 33a and 33b to control circuit sections 4a and 4b. For example... Figure 1 As shown in the circuit diagram, the power lines are connected to the uppermost filters 7a and 7b, and then to the power system buses 40a and 40b, as well as the extension terminals 37a and 37b. Signal lines are input to the input circuits 12a and 12b of the control circuit sections 4a and 4b.

[0072] <Capacitor Holder, Bus Holder>

[0073] Will use Figures 4 to 9 The capacitor holders 44a and 44b, the bus holders 41a and 41b, and the smoothing capacitor 18 are described. Multiple smoothing capacitors 18 are housed in the capacitor holders 44a and 44b (in Embodiment 1, each capacitor holder 44a and 44b houses 3).

[0074] By arranging capacitor holders 44a and 44b radially outward of the rotary motor 2, and arranging and assembling smooth capacitors approximately parallel to the surfaces 45 of busbar holders 41a and 41b along the axial direction of the rotary motor 2, the smooth capacitors 18 can be compactly fixed between the busbar holders 41a and 41b, thereby improving vibration resistance. Assemblies are improved by assembling multiple smooth capacitors 18 into the rotary motor assembly 100 using capacitor holders 44a and 44b.

[0075] Capacitor holders 44a and 44b, which hold multiple smooth capacitors 18, are fixed to the surfaces 45 of bus holders 44a and 44b approximately parallel to each other by pressing, snapping, or adhesive 58. In Embodiment 1, they are fixed by inserting the protrusions 55 provided at the ends of capacitor holders 44a and 44b into holes 56 provided at the ends of bus holders 41a and 41b, which will be described later. By fixing capacitor holders 44a and 44b to bus holders 41a and 41b, the smooth capacitors 18 sandwiched in the middle are more securely fixed and vibration resistance is improved. Furthermore, since multiple smooth capacitors 18 disposed on capacitor holders 44a and 44b are simultaneously fixed by fixing capacitor holders 44a and 44b to bus holders 41a and 41b, assemblability is improved.

[0076] When capacitor holders 44a and 44b are bonded to bus holders 41a and 41b via adhesive 58, the multiple smooth capacitors 18 sandwiched in between are more securely fixed, thereby improving vibration resistance. In addition, the fixing using adhesive 58 eliminates the need for thread tightening and pressing processes, which also helps improve assemblability.

[0077] like Figure 2 As shown, multiple longitudinally elongated cylindrical smooth capacitors 18 are arranged in the output shaft direction, such that their long sides are perpendicular to the output shaft of the rotary motor 2. Furthermore, as... Figure 2 , 3 As shown, the terminals 46 of the plurality of smoothing capacitors 18 are connected in the same direction to the power system buses 40a and 40b. Figure 2(Left direction in the middle). By arranging the smoothing capacitors 18 with the terminals 46 facing in the same direction, multiple smoothing capacitors 18 can be electrically connected using the same power system buses 40a and 40b, which is efficient. Furthermore, since the power system buses 40a and 40b can be connected in the shortest possible way, and their lengths are minimized, it contributes to miniaturization, cost reduction, and improved assemblability. (e.g., left direction in the middle). Figure 3 As shown, capacitor holders 44a and 44b are arranged radially outward of the rotary motor 2 relative to the plurality of smooth capacitors 18.

[0078] Figure 4 The inner appearance of capacitor holders 44a and 44b is shown. Figure 5 Showing the exterior appearance. Figure 6 The inner appearance of the smooth capacitor 18 housed in capacitor holders 44a, 44b is shown. Figure 7 Showing the exterior appearance.

[0079] Capacitor holders 44a and 44b are provided with a pressing part 47, a terminal slot part 48, and a snap-fit ​​part 59 for each smooth capacitor 18. Figure 8 An enlarged view of the latching part 59 is shown in the figure.

[0080] Multiple smooth capacitors 18, which are formed in the shape of a longitudinal elongated cylinder, are arranged along the circumference of the rotary motor 2. The capacitor holders 44a and 44b have a main body 63 that is located radially outward from the rotary motor 2 closer to the smooth capacitors 18, a pressing part 47 that extends radially inward from the main body 63 to the rotary motor 2 on one side of the smooth capacitors 18, i.e., the side opposite to the terminal 46, and a latching part 59 that extends radially inward from the main body 63 to the rotary motor 2 on the other side of the smooth capacitors 18, i.e., the side opposite to the terminal 46.

[0081] The smooth capacitor 18 is supported radially outward from the rotary motor 2 by the main body 63 of the capacitor holders 44a and 44b, and clamped by the pressing part 47 and the snap-fit ​​part 59, thereby making it easy to place the smooth capacitor 18 in the capacitor holders 44a and 44b. Since the smooth capacitor 18 is supported by the main body 63 while being pressed and fixed by the pressing part 47 and the snap-fit ​​part 59, a capacitor with high vibration resistance can be fixed.

[0082] The latching part 59 includes: two beam parts 50 extending parallel to the long side of the smooth capacitor 18; a U-shaped beam part 51 bending at the front end of the beam part 50 in the same direction as the pressing part 47 and configured to avoid the center part opposite to the terminal 46 of the smooth capacitor 18 (explosion valve side); and a claw part 52 provided at the front end of the U-shaped beam part 51.

[0083] In other words, the latching part 59 has: two U-shaped beam parts 51, which extend along the radially outer portion of the rotary motor 2 on the outer peripheral surface of the smooth capacitor 18, i.e., the main body part 63, toward the side opposite to the axial terminal 46 of the smooth capacitor 18, and then extend radially inward toward the rotary motor 2 away from the central axis of the smooth capacitor on the side opposite to the axial terminal 46 of the smooth capacitor 18; a connecting part that connects the front ends of the two U-shaped beam parts 51; and a claw part 52 provided on the connecting part.

[0084] Since the smooth capacitor 18 is fixed by the claw portion 52 of the connecting portion provided at the front end of the connecting portion of the two U-shaped beam portions 51, and the two U-shaped beam portions 51 extend radially inward toward the rotary motor 2 away from the central axis of the smooth capacitor 18, the explosion-proof portion of the smooth capacitor 18 will not be blocked, and the smooth capacitor 18 can be fixed in an explosion-proof manner.

[0085] A concave guide groove 53 is provided on the upper surface of the claw portion 52. Furthermore, a support portion 49 is provided at the center of the two beam portions 50. By extending the support portion 49 of the smooth capacitor 18 along the long side of the smooth capacitor 18, the smooth capacitor 18 can be assembled without tilting in the axial direction of the capacitor. Furthermore, by forming beam portions 50 from both sides of the support portion 49, the snap-fit ​​portion 59 becomes a flexible structure when assembling the smooth capacitor 18, thus preventing damage to the capacitor holders 44a and 44b.

[0086] When the smooth capacitor 18 is assembled in the capacitor holders 44a and 44b, the guide groove 53 takes on a shape that follows the outline of the smooth capacitor 18. In Embodiment 1, the guide groove 53 is shaped along the side (curved surface) of the cylindrical smooth capacitor 18. For example, this shape is the same as the indentation formed when the side (curved surface) of a defined cylinder is pressed onto a soft object such as clay.

[0087] When the smooth capacitor 18 is assembled in the capacitor holders 44a and 44b, the smooth capacitor 18 can be easily fixed by inserting it into the guide slot 53 along the outline of the smooth capacitor 18, thus improving the assemblability.

[0088] In the pressing portion 47 of the capacitor holders 44a and 44b, there is a terminal slot 48 through which the terminal 46 of the smoothing capacitor 18 passes. By inserting the terminal 46 of the smoothing capacitor 18 into the terminal slot 48 provided in the pressing portion 47, the position of the terminal 46 can be fixed and the smoothing capacitor 18 can be assembled without rotation. The stress applied to the connection between the terminal 46 of the smoothing capacitor 18 and the power system buses 40a and 40b due to the rotational assembly of the smoothing capacitor 18 can be eliminated, thereby improving durability. In addition, since it is not necessary to check and correct whether the position of the smoothing capacitor 18 is rotating, the assemblability is improved.

[0089] The terminals 46 of the smooth capacitor 18 are inserted into the terminal slot 48 and clamped by the pressing part 47 and the snap-fit ​​part 59. The claw part 52 contacts the smooth capacitor 18 on the opposite side (explosion-proof valve side) of the terminals 46, thereby creating space between the U-shaped beam part 51 and the explosion-proof valve of the smooth capacitor 18 while holding the smooth capacitor 18 in place. The U-shaped beam part 51 is configured to avoid the center portion of the opposite side (explosion-proof valve side) of the terminals 46 of the smooth capacitor 18, and only the claw part 52 can contact and hold the smooth capacitor 18. Thus, space can be provided between the U-shaped beam part 51 and the smooth capacitor 18, and the smooth capacitor can be fixed without blocking the explosion-proof valve of the smooth capacitor 18.

[0090] Multiple smooth capacitors 18 can be fixed to capacitor holders 44a and 44b using adhesive 58. By fixing with adhesive 58, the multiple smooth capacitors 18 are more securely fixed to capacitor holders 44a and 44b, improving vibration resistance. In addition, fixing with adhesive 58 eliminates the need for thread tightening and pressing processes, which also helps improve assemblability.

[0091] Ribs 54 are provided on the side of capacitor holders 44a and 44b opposite to the portion housing the smooth capacitor 18. The ribs 54 facilitate gripping of capacitor holders 44a and 44b. Assemblance is improved when assembling the smooth capacitor 18 to capacitor holders 44a and 44b, and when assembling capacitor holders 44a and 44b to busbar holders 41a and 41b. Furthermore, the ribs 54 increase the strength of capacitor holders 44a and 44b, thus suppressing deformation during assembly and improving assembly accuracy. Increased rigidity of capacitor holders 44a and 44b improves vibration resistance.

[0092] Capacitor holders 44a and 44b include protrusions 55 for assembling capacitor holders 44a and 44b to busbar holders 41a and 41b. The appearance of busbar holders 41a and 41b is as follows. Figure 9 As shown.

[0093] The busbar retainers 41a and 41b have holes 56 at their ends for assembling the protrusions 55 at the ends of the capacitor retainers 44a and 44b. The capacitor retainers 44a and 44b are fixed to the busbar retainers 41a and 41b by inserting the protrusions 55 into the holes 56.

[0094] Busbar retainers 41a and 41b and capacitor retainers 44a and 44b can be manufactured by resin molding. By forming a portion where the maximum outer diameter of the protrusion 55 is above the diameter of the hole 56, pressure can be applied to press the protrusion 55 into the hole 56 and fix it in place. Alternatively, busbar retainers 41a and 41b and capacitor retainers 44a and 44b can also be made of metal. By adjusting the outer diameter of the protrusion 55 and the inner diameter of the hole 56, the protrusion 55 and the hole 56 can be fixed by pressing in a mid-fit, tight-fitting state. By fixing the protrusion 55 by inserting it into the hole 56, the capacitor retainers 44a and 44b can be more securely fixed to the busbar retainers 41a and 41b in accurate positions, thereby improving vibration resistance and also helping to improve assemblability.

[0095] Busbar holders 41a and 41b are provided with recesses 57 for accommodating the claw portions 52 of capacitor holders 44a and 44b. When capacitor holders 44a and 44b are assembled to busbar holders 41a and 41b, interference between the claw portions 52 and busbar holders 41a and 41b can be prevented. This prevents obstruction of assembly.

[0096] Adhesive 58 can be applied to the surfaces 45 of busbar retainers 41a and 41b, and the smoothing capacitor 18 can be fixed to the busbar retainers 41a and 41b via adhesive 58. The busbar retainers 41a and 41b, adhesive 58, smoothing capacitor 18, and capacitor retainers 44a and 44b are arranged sequentially from the center line of the output shaft of the rotary motor 2 outwards radially. Therefore, a rotary motor with strong retention of the smoothing capacitor 18, high vibration resistance, and excellent assemblability can be achieved. Furthermore, although the busbar retainers 41a and 41b, adhesive 58, and smoothing capacitor 18 are arranged sequentially as described above, they can also be fixed with adhesive 58 after the busbar retainers 41a and 41b come into contact with the smoothing capacitor 18. The smoothing capacitor 18, pre-inserted into the capacitor retainers 44a and 44b, can be assembled together into the busbar retainers 41a and 41b. Compared with the process of assembling the smooth capacitor 18 to the bus retainers 41a and 41b coated with adhesive 58, the assemblability is improved, and the vibration resistance is improved because the coating state of adhesive 58 is stable.

[0097] Adhesive 58 can be applied to the recesses 57 on the surfaces 45 of the busbar retainers 41a and 41b. Therefore, the claws 52 are fixed in the recesses 57 by the adhesive 58. Thus, the busbar retainers 41a and 41b, as well as the capacitor retainers 44a and 44b, can be more securely fixed, thereby enabling a rotary motor that strongly holds the smooth capacitor 18, has high vibration resistance, and excellent assemblability.

[0098] On the surfaces 45 of the busbar retainers 41a and 41b, a recess (not shown) shaped along the outer diameter of the smooth capacitor 18 can be formed at a position opposite to the smooth capacitor 18 when it is assembled onto the busbar retainers 41a and 41b. Alternatively, at a position on the surface 45 opposite to the smooth capacitor 18, a portion protruding from the surface 45 toward the smooth capacitor 18 can be provided, and a recess (not shown) shaped along the outer diameter of the smooth capacitor 18 can be formed at this portion. This is because by forming the surfaces 45 of the busbar retainers 41a and 41b along the outer diameter of the smooth capacitor 18, the smooth capacitor 18 can be held more securely by the busbar retainers 41a and 41b, thus improving vibration resistance.

[0099] In this way, when the electric power steering device has two sets of independent rotating motor windings and two sets of rotating motor drive circuits, it is possible to provide a device with high vibration resistance and excellent product assemblability.

[0100] <Effects of Implementation Method 1>

[0101] (a) The rotary electric motor device 100 according to Embodiment 1 includes:

[0102] A rotary motor 2 having windings 25 and an output shaft 22;

[0103] Power modules 5a and 5b having switching elements 14, 15, and 16 connected to winding 25;

[0104] Power system buses 40a and 40b are held by bus holders 41a and 41b and form the power supply path to power modules 5a and 5b;

[0105] Multiple smoothing capacitors 18 connected to power system buses 40a and 40b; and

[0106] Capacitor holders 44a and 44b hold a plurality of smooth capacitors 18 arranged radially outward from the rotating motor 2, closer to the rotating motor 2 than bus holders 41a and 41b, along the axial direction of the rotating motor 2, and hold them from the outer peripheral side of the rotating motor 2.

[0107] By arranging capacitor holders 44a and 44b radially outward of the rotary motor 2, and arranging and assembling smooth capacitors approximately parallel to the surfaces 45 of busbar holders 41a and 41b, the smooth capacitors 18 can be compactly fixed between the smooth capacitors 18 and the busbar holders 41a and 41b, thereby improving vibration resistance. By arranging capacitor holders 44a and 44b to assemble multiple smooth capacitors 18 into the rotary motor assembly 100, assemblability is improved.

[0108] (b) In embodiment 1, the rotary motor device 100 has a plurality of smooth capacitors 18 formed in the shape of cylinders arranged along the circumference of the rotary motor 2.

[0109] By arranging the long, cylindrical smooth capacitor 18 with a large capacity along the axial direction of the rotary motor 2 so that the central axis of the smooth capacitor 18 is along the circumference of the rotary motor 2, the smooth capacitor 18 can be compactly fixed between the capacitor holders 44a, 44b and the bus holders 41a, 41b, thereby improving vibration resistance.

[0110] (c) The rotary motor device 100 according to Embodiment 1 is a device for fixing capacitor holders 44a and 44b to bus holders 41a and 41b.

[0111] By fixing capacitor holders 44a and 44b to bus holders 41a and 41b, the smooth capacitor 18 sandwiched in the middle is more securely fixed and its vibration resistance is improved. Furthermore, since the multiple smooth capacitors 18 disposed on capacitor holders 44a and 44b are simultaneously fixed by fixing capacitor holders 44a and 44b to bus holders 41a and 41b, assemblability is improved.

[0112] (d) In the rotary motor device 100 according to Embodiment 1, the bus retainers 41a and 41b have holes 56 or protrusions 55 at their ends, and the capacitor retainers 44a and 44b have protrusions 55 or holes 56 at their ends. The protrusions 55 are inserted into the holes 56, and the bus retainers 41a and 41b and the capacitor retainers 44a and 44b are fixed.

[0113] By inserting the protrusion 55 into the hole 56 for fixation, the capacitor holders 44a and 44b can be more securely fixed to the bus holders 41a and 41b in the accurate position, thereby improving vibration resistance and also helping to improve assembly.

[0114] (e) In the rotary motor device 100 according to Embodiment 1, the capacitor holders 44a and 44b have a pressing part 47 provided on the side of the terminal 46 of the smooth capacitor 18 connected to the power system bus 40a and 40b and pressing the smooth capacitor 18, and a latching part 59 provided on the side opposite to the pressing part 47 and fixing the smooth capacitor 18.

[0115] The smooth capacitor 18 can be easily disposed in the capacitor holders 44a and 44b by being clamped by the pressing part 47 and the snap-fit ​​part 59. Since the smooth capacitor 18 is pressed and fixed by the pressing part 47 and the snap-fit ​​part 59, its vibration resistance can be improved.

[0116] (f) In the rotary motor device 100 according to Embodiment 1, a terminal slot 48 for the terminal 46 of the smoothing capacitor 18 to pass through is provided on the pressing part 47 of the capacitor holders 44a and 44b.

[0117] The terminals 46 of the smoothing capacitor 18 are inserted into the terminal slots 48 of the capacitor holders 44a and 44b and clamped by the pressing part 47 and the snap-fit ​​part 59, thereby fixing the smoothing capacitor 18 to the capacitor holders 44a and 44b. Therefore, the position of the terminals 46 can be fixed and the smoothing capacitor 18 can be assembled without rotation. Stress applied to the connection between the terminals 46 of the smoothing capacitor 18 and the power system buses 40a and 40b due to rotational assembly of the smoothing capacitor 18 can be eliminated, thereby improving durability. Since it is not necessary to check or correct whether the position of the smoothing capacitor 18 has rotated, assembly ease is improved.

[0118] (g) In Embodiment 1, the rotary motor device 100 has a plurality of smooth capacitors 18 formed in the shape of cylinders arranged along the central axis of the rotary motor 2.

[0119] The capacitor holders 44a and 44b have a main body 63 located radially outward from the smooth capacitor 18, a pressing part 47 extending radially inward from the main body to the rotary motor 2 on one axial side of the smooth capacitor 18, and a latching part 59 extending radially inward from the main body 63 to the rotary motor 2 on the other axial side of the smooth capacitor 18.

[0120] The smooth capacitor 18 is supported radially outward from the rotary motor 2 by the main body 63 of the capacitor holders 44a and 44b, while being clamped by the pressing part 47 and the snap-fit ​​part 59, thereby making it easy to place the smooth capacitor 18 in the capacitor holders 44a and 44b. Since the main body 63 supports the cylindrical surface of the smooth capacitor 18 while pressing and fixing the smooth capacitor 18 by the pressing part 47 and the snap-fit ​​part 59, vibration resistance can be improved.

[0121] (h) In the rotary motor device 100 according to Embodiment 1, a plurality of smooth capacitors 18 formed in the shape of cylinders are arranged along the circumference of the rotary motor 2, a pressing part 47 is provided on one side of the axial direction of the smooth capacitor 18, and a snap-fit ​​part 59 is provided on the other side of the axial direction of the smooth capacitor 18.

[0122] The latching part 59 has: two U-shaped beam parts 51, which extend along the radially outer portion of the rotary motor 2 on the outer peripheral surface of the smooth capacitor 18, i.e., the main body part 63, to the other side of the axial direction of the smooth capacitor 18, and then extend radially inward to the rotary motor 2, avoiding the central axis of the smooth capacitor, on the other side of the axial direction of the smooth capacitor 18; a connecting part that connects the front ends of the two U-shaped beam parts 51; and a claw part 52 provided on the connecting part.

[0123] The smooth capacitor 18 is supported radially outward from the rotary motor 2 by the main body 63 of the capacitor holders 44a and 44b, while being clamped by the pressing part 47 and the snap-fit ​​part 59, thereby allowing the smooth capacitor 18 to be easily positioned in the capacitor holders 44a and 44b. Since the smooth capacitor 18 is supported by the main body 63 while being pressed and fixed by the pressing part 47 and the snap-fit ​​part 59, vibration resistance is improved. Because the smooth capacitor 18 is fixed by the claw part 52 of the connecting part provided at the front end of the two U-shaped beam parts 51, which extend radially inward from the central axis of the smooth capacitor 18, the explosion-proof part of the smooth capacitor 18 is not blocked, enabling explosion-proof fixing of the smooth capacitor 18.

[0124] (i) In the rotary motor device 100 according to Embodiment 1, the capacitor holders 44a and 44b have a support portion 49 that extends axially along the smooth capacitor 18 between portions of two beam portions 50 extending along the outer peripheral surface of the smooth capacitor 18 and supports the outer peripheral surface of the smooth capacitor 18.

[0125] By extending the support portion 49 of the smooth capacitor 18 along the long side of the smooth capacitor 18, the smooth capacitor 18 can be assembled without tilting in the axial direction of the capacitor. Furthermore, by forming beam portions 50 from both sides of the support portion 49, the snap-fit ​​portion 59 becomes a flexible structure when assembling the smooth capacitor 18, thus preventing damage to the capacitor holders 44a and 44b.

[0126] (j) In Embodiment 1, the two U-shaped beams 50 and 51 and the connecting part of the rotary motor device 100 do not abut against the smoothing capacitor 18, while the claw part 52 abuts against the smoothing capacitor 18 to keep the smoothing capacitor 18 in place.

[0127] The U-shaped beam portion 51 is configured to avoid the center portion of the smooth capacitor 18 on the opposite side (explosion-proof valve side), and only the claw portion 52 can contact and hold the smooth capacitor 18. As a result, a space can be provided between the U-shaped beam portion 51 and the smooth capacitor 18, and the smooth capacitor can be fixed without blocking the explosion-proof valve of the smooth capacitor 18.

[0128] (k) In the rotary motor device 100 according to Embodiment 1, a guide groove 53 is provided on the claw portion 52 of the capacitor holders 44a and 44b, which allows the end of the smoothing capacitor 18 on the side opposite to the terminal 46 to be slidably inserted when the smoothing capacitor 18 is installed.

[0129] When the smooth capacitor 18 is assembled in the capacitor holders 44a and 44b, the assemblability is improved by inserting it into the guide slot 53 along the outline of the smooth capacitor 18.

[0130] (l) In the rotary motor device 100 according to Embodiment 1, the bus retainers 41a and 41b have recesses 57 for accommodating the claw portions 52 of the capacitor retainers 44a and 44b.

[0131] Busbar holders 41a and 41b are provided with recesses 57 for accommodating the claw portions 52 of capacitor holders 44a and 44b. When capacitor holders 44a and 44b are assembled to busbar holders 41a and 41b, interference between the claw portions 52 and busbar holders 41a and 41b can be prevented. This prevents obstruction of assembly.

[0132] (m) In the rotary motor device 100 according to Embodiment 1, the capacitor holders 44a and 44b have ribs 54 on the side opposite to the smooth capacitor 18.

[0133] By providing ribs 54 on the side of capacitor holders 44a and 44b opposite to the receiving portion of smooth capacitor 18, capacitor holders 44a and 44b are easier to grip. Assemblance is improved when assembling smooth capacitor 18 to capacitor holders 44a and 44b, and when assembling capacitor holders 44a and 44b to busbar holders 41a and 41b. Furthermore, by providing ribs 54, the strength of capacitor holders 44a and 44b themselves is increased, thus suppressing deformation during assembly and improving assembly accuracy. Vibration resistance is improved by increasing the rigidity of capacitor holders 44a and 44b.

[0134] (n) In the rotary motor device 100 according to Embodiment 1, a plurality of smooth capacitors 18 are assembled to capacitor holders 44a and 44b with the terminals 46 facing in the same direction.

[0135] By arranging the smoothing capacitors 18 with the terminals 46 facing in the same direction, multiple smoothing capacitors 18 can be electrically connected using the same power system buses 40a and 40b, which is efficient. Furthermore, since the power system buses 40a and 40b can be connected in the shortest possible way, and the length of the power system buses 40a and 40b can be saved, it contributes to miniaturization, cost reduction and improved assemblability.

[0136] (c) In the rotary electric motor device 100 according to Embodiment 1, capacitor holders 44a and 44b are fixed to bus holders 41a and 41b via adhesive 58.

[0137] Since capacitor holders 44a and 44b are bonded to bus holders 41a and 41b via adhesive 58, the multiple smooth capacitors 18 sandwiched in between are more securely fixed, thereby improving vibration resistance. In addition, the fixing using adhesive 58 eliminates the need for thread tightening and pressing processes, which also helps improve assemblability.

[0138] (p) In the rotary motor device 100 according to Embodiment 1, the smoothing capacitor 18 is fixed to at least one of the capacitor holders 44a, 44b and the bus holders 41a, 41b via adhesive 58.

[0139] Since the smoothing capacitor 18 is fixed to at least one of the capacitor holders 44a, 44b and the bus holders 41a, 41b via adhesive 58, the plurality of smoothing capacitors 18 are securely fixed to one or both of the capacitor holders 44a, 44b and the bus holders 41a, 41b, thereby improving vibration resistance. In addition, the fixing using adhesive 58 eliminates the need for thread tightening and pressing processes, which also helps to improve assemblability.

[0140] 2. Implementation Method 2

[0141] Hereinafter, the rotary motor device 101 according to Embodiment 2 of this application will be described with reference to the accompanying drawings. Figure 10 This is a circuit diagram of the rotary motor device 101 according to Embodiment 2. Figure 11 This is a cross-sectional view of the rotary motor device 101 according to Embodiment 2. Figure 12 This is a top perspective view of the rotary motor device 101 according to Embodiment 2.

[0142] In Embodiment 1, the example is given where the control unit 1 that drives the rotary motor 2 is composed of control units 1a and 1b of two systems. However, in Embodiment 2, the structure of the control unit 1 being a control unit 1c of one system will be described. Figure 10This is a circuit diagram of the rotating electric motor assembly 101. 1c is the control unit, and 201 is the three-phase rotating electric motor. The control unit 1c is connected to... Figure 1 It has the same structure as 1a and carries roughly the same components.

[0143] Figure 11 This is a cross-sectional view of the rotary motor assembly 101, with the control unit 1 integrated on the reverse output side of the rotary motor 201. 1 represents the control unit, and 201 is a multi-phase winding rotary motor. The rotary motor assembly 101 is used in an electric power steering system. The structure of the rotary motor 201 is similar to... Figure 1 They are basically the same, but the windings have only one system.

[0144] The control unit 1 is covered by a housing 31. On the end face opposite to the output side, there is a power connector 32a for connecting to an external power source (battery 8) and a signal connector 33a for connecting to the sensor type 11. On the surface perpendicular to the output shaft 22 on the side where the power connector 32a and the signal connector 33a are located, a filter 7a and the like, which are relatively large components, are mounted.

[0145] The column portion of the heat sink 34 is positioned at the center inside the housing 31. The control circuit section 4a, the power module 5a forming the inverter circuit, and other components are arranged around it. The lower portion 34a of the heat sink 34 forms a circle that is inscribed within the housing 21 of the rotary motor 2. The reverse output end of the output shaft 22 extends along this center and... Figure 2 Similarly, the sensor rotor 30 is also mounted. Additionally, the power connector 32a and various signal connectors 33a are also compatible. Figure 2 Similarly, electrical connections are made to the busbar and smoothing capacitor 18.

[0146] Figure 12 This is a top perspective view of the rotary motor assembly 101. A heat sink 34, with a column formed into a generally rectangular parallelepiped, is positioned in the center. A control circuit section 4a is arranged along one side, and a power module 5a is closely arranged on the adjacent side. A busbar unit 39a is positioned on the surface opposite to the control circuit section 4a. The structures of the busbar holder 41a, smoothing capacitor 18, adhesive 58, and capacitor holder 44a are the same as in Embodiment 1.

[0147] The terminals U, V, and W (not shown) of the winding end 27 are arranged in the outer peripheral direction of the bus unit 39a and are connected to the output terminal 38a of the power module 5a via the bus unit 39a. In addition, the circuit board 35 is disposed in a hole that penetrates the lower part of the heat sink 34.

[0148] The same effect as in Embodiment 1 can be obtained in the device configured above. In the case of an electric power steering device that includes a set of rotating motor windings and a set of rotating motor drive circuits, a device with high vibration resistance and excellent product assemblability can be provided.

[0149] 3. Implementation Method 3

[0150] Hereinafter, the rotary motor device 102 according to Embodiment 3 of this application will be described with reference to the accompanying drawings. Figure 13 This is a cross-sectional view of the rotary motor device 102 according to Embodiment 3. Figure 14 This is a top perspective view of the rotary motor device 102 according to Embodiment 3. Figure 15 This is an inner view of the capacitor holder 44c of the rotary motor device 102 according to Embodiment 3. Figure 16 This is an external view of the capacitor holder 44c of the rotary motor device 102 according to Embodiment 3. Figure 17 This is an inner view of the rotating motor device 102 according to Embodiment 3, on which a smoothing capacitor 18 is mounted on the capacitor holder 44c. Figure 18 This is an external view of the capacitor holder 44c on which the smoothing capacitor 18 is mounted in the rotary motor device 102 according to Embodiment 3. Figure 19 This is an external view of the busbar retainer 41c of the rotary electric motor device 102 according to Embodiment 3.

[0151] Embodiment 3 is a variation of Embodiment 1, differing in that a single control circuit unit 4c drives the power modules 5a and 5b of both systems, and that the orientation of the terminals 46 of the smoothing capacitor 18 differs from each other. In Embodiment 3, although not shown, it includes a multi-layer winding rotary motor 2, power relay switching elements 6a and 6b for supplying current to the multi-layer winding rotary motor 2, and power modules 5a and 5b of both systems equipped with inverter circuits. The control circuit unit 4c includes two drive circuits for driving the power modules 5a and 5b of the two systems.

[0152] Figure 13 This is a cross-sectional view of the rotary motor assembly 102, in which the control unit 1 is integrated on the reverse output side of the rotary motor 2. 1 is the control unit, and 2 is a multi-phase winding rotary motor. It is used in an electric power steering system. The structure of the rotary motor 2 is similar to... Figure 1 They are roughly the same.

[0153] The outer layer of the control unit 1 is covered by the housing 31. On the end face of the control unit 1 opposite to the output side of the output shaft, there is a power connector 32a for connecting to an external power source (battery 8) and a signal connector 33a for connecting to the sensor type 11. On the surface perpendicular to the output shaft 22 on the side where the power connector 32a and the signal connector 33a are located, a filter 7a and the like, which are relatively large components, are mounted.

[0154] Inside the housing 31, a central column of a heat sink 34 is arranged, and around it are a control circuit section 4a, power modules 5a and 5b forming the inverter circuit, etc. The lower part 34a of the heat sink 34 forms a circle that is inscribed within the housing 21 of the rotary motor. The reverse output end of the output shaft 22 extends along this central point and... Figure 2 Similarly, the sensor rotor 30 is also mounted. Additionally, the power connector 32a and various signal connectors 33a are also compatible. Figure 2 Similarly, they are electrically connected to the power system buses 40c and 40d and the control circuit section 4c.

[0155] Figure 14 This is a top perspective view of the rotary motor device 102. A heat sink 34, which is roughly rectangular in shape, is arranged in the center. A control circuit section 4c is arranged along one side. Power modules 5a and 5b are arranged close to the ground on the two sides adjacent to it. The bus unit 39c is arranged on the surface opposite to the control circuit section 4c.

[0156] Here, we will use Figure 13 , 14 The capacitor holder 44c, bus holder 41c, and smoothing capacitor 18 will be described below. A plurality of smoothing capacitors 18 (four in this embodiment) are housed in the capacitor holder 44c. The capacitor holder 44c, which holds the plurality of smoothing capacitors 18, is then fixed approximately parallel to the surface 45 of the bus holder 41c by pressing, snapping, adhesive 58, or the like. In this embodiment, it is fixed by inserting a protrusion 55 provided in the capacitor holder 44c into a hole 56 provided in the bus holder 41c, which will be described later.

[0157] The assembly status is described below. For example... Figure 13 As shown, multiple smoothing capacitors 18 are arranged in the output shaft direction such that their long sides are perpendicular to the output shaft of the rotary motor 2 (equivalent to the "generally parallel longitudinal stacking" described in claim 1). Furthermore, as... Figure 13 , Figure 14 As shown, the terminals 46 of multiple smoothing capacitors 18 are connected to the power system buses 40c and 40d in different orientations. Figure 10 As shown, the capacitor holder 44c is arranged radially outward of the rotary motor 2 relative to the plurality of smooth capacitors 18.

[0158] An overview of capacitor holder 44c is as follows: Figures 15 to 18 As shown. Furthermore, the state of the smoothing capacitor 18 is as follows. Figure 16 As shown. The shapes of the pressing part 47, terminal groove part 48, support part 49, beam part 50, U-shaped beam part 51, and claw part 52 of the capacitor holder 44c are the same as in Embodiment 1, but they are arranged differently from each other according to the orientation of the terminals 46 of the smooth capacitor 18. In addition, the ribs 54 and protrusions 55 of the capacitor holder 44c also have the same structure as in Embodiment 1.

[0159] The appearance of bus retainer 41c is as follows Figure 19 As shown. On the bus holder 41c, after assembling the bus holder 41c and the capacitor holder 44c, the recesses 57 of the receiving claw portion 52 are provided differently from each other, and the smooth capacitor 18 and the capacitor holder 44c are fixed to the bus holder 41c with adhesive 58 in the same way as in embodiment 1.

[0160] Two sets of terminals U, V, and W (not shown) at the winding ends 27a and 27b are arranged in the outer peripheral direction of the bus unit 39c and are connected to the output terminals 38a of the power modules 5a and 5b via the bus unit 39c. Additionally, the circuit board 35 is disposed in a hole penetrating the lower part of the heat sink 34.

[0161] In the device configured as described above, in addition to the same effects as in Embodiment 1, by arranging the orientations of the smoothing capacitors 18 differently, the connection positions of the terminals 46 of the smoothing capacitors 18 can be placed near the respective power modules 5a and 5b of the two systems, thereby improving the noise suppression effect. Regarding the arrangement of multiple smoothing capacitors 18, smoothing capacitors 18 in different directions can be arranged differently from each other, and smoothing capacitors 18 in the same direction can be arranged in groups. In the case of four smoothing capacitors 18, they can also be arranged in a configuration such as one side, opposite side, opposite side, and one side.

[0162] In the case of an electric power steering device that has two sets of rotating motor windings and two sets of rotating motor drive circuits, it is possible to provide a device with high vibration resistance, excellent product assemblability, and high noise suppression effect.

[0163] <Effects of Implementation Method 3>

[0164] (q) In the rotary motor device 102 according to Embodiment 3, among the plurality of smoothing capacitors 18, some have their terminals 46 oriented toward one side, while others have their terminals 46 oriented toward the opposite side, and are mounted to the capacitor holder 44c.

[0165] By configuring the orientation of the smoothing capacitors 18 differently from each other, the connection positions of the terminals 46 of the smoothing capacitors 18 can be set near the respective power modules 5a and 5b of the two systems, thereby improving the noise suppression effect.

[0166] As described above, in embodiments 1 to 3, a smoothing capacitor 18 is described as being connected to the switching elements 14 and 15 of the power modules 5a and 5b. However, the technology involved in embodiments 1 to 3 can be applied to fixing smoothing capacitors 60a, 60b, 61a, and 61b, which are also used for smoothing and are large-capacity capacitors, i.e., filters 7a and 7b. For smoothing capacitors 60a and 60b or smoothing capacitors 61a and 61b or both, the fixing based on capacitor holders 44a, 44b, and 44c and bus holders 41a, 41b, and 41c involved in embodiments 1 to 3 is effective as a structure that ensures the vibration resistance of multiple smoothing capacitors while improving assembly and compact fixing.

[0167] 4. Implementation Method 4

[0168] Figure 20 This is a structural diagram of the electric power steering device 150 according to Embodiment 4. (By...) Figure 20 This illustrates an example of applying the rotary motor device 100 to an electric power steering system 150 mounted on a vehicle. Figure 20 This is an overall structural diagram of the electric power steering device 150, which is an example of a rack-and-pinion electric power steering device. The electric power steering device 150 according to Embodiment 4 uses 101 and 102 in addition to the rotary motor device 100, and has the same effect.

[0169] When the driver generates steering torque through the steering wheel 151, the torque sensor 152 detects this steering torque and outputs it to the rotary motor device 100. Additionally, the speed sensor 153 detects the vehicle's speed and outputs it to the rotary motor device 100. Based on the inputs from the torque sensor 152 and the speed sensor 153, the rotary motor device 100 generates an auxiliary torque to assist the steering torque and provides this auxiliary torque to the steering mechanism of the vehicle's front wheels 154. The torque sensor 152 and the speed sensor 153 are... Figure 1 It is part of sensor class 11. The rotary electric motor device 100 can also generate auxiliary torque based on inputs other than torque sensor 152 and speed sensor 153.

[0170] <Effects of Implementation Method 4>

[0171] (r) The electric power steering device according to Embodiment 4 includes a rotary motor device 100, etc.

[0172] By improving the vibration resistance of the rotary motor unit used in the electric power steering system and enhancing its assemblability, the reliability of the electric power steering system 150 can be improved, and the increased productivity can help reduce costs.

[0173] While 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 a particular embodiment and can be applied to the embodiments individually or in various combinations. Therefore, it can be considered that numerous modifications not illustrated are also included within the scope of the technology disclosed in this application. For example, this includes cases where at least one constituent element is modified, added to, or omitted, and cases where at least one constituent element is extracted and combined with constituent elements of other embodiments.

[0174] Label Explanation

[0175] 2. 201 Rotary Motor

[0176] 5a and 5b power modules

[0177] 18 smooth capacitor

[0178] 22 output shaft

[0179] 33a, 33b signal connectors

[0180] 40a, 40b, 40c, 40d power system buses

[0181] 41a, 41b, 41c bus retainers

[0182] 44a, 44b, 44c capacitor holders

[0183] 45 surface

[0184] 46 terminals

[0185] 47 Pressing Part

[0186] 48 terminal slots

[0187] 49 Support section

[0188] 50 beam section

[0189] 51 U-shaped beam section

[0190] 52 claws

[0191] 53 Guide groove section

[0192] 54 ribs

[0193] 55 protrusions

[0194] 56 holes

[0195] 57 recess

[0196] 58 Adhesive

[0197] 59 Buckle Section

[0198] Rotary motor devices 100, 101, and 102.

Claims

1. A rotary electric motor device, characterized in that, include: A rotary motor with windings and an output shaft; A power module having a switching element connected to the winding; The busbar, held by a busbar holder, forms a power supply path to the power module; Multiple smoothing capacitors connected to the busbar; A capacitor holder that arranges a plurality of the smooth capacitors radially outward from the rotating motor along the axial direction of the rotating motor, closer to the rotating motor than the busbar holder, and holds them from the outer peripheral side of the rotating motor. The capacitor retainer has a pressing part disposed on one side of the terminal of the smooth capacitor connected to the busbar and pressing the smooth capacitor, and a snap-fit ​​part disposed on the opposite side of the pressing part and fixing the smooth capacitor. The pressing part of the capacitor holder is provided with a terminal slot that allows the terminals of the smooth capacitor to pass through. The central axis of a plurality of smooth capacitors, which are formed in the shape of cylinders, is arranged along the circumference of the rotary motor. The pressing part is provided on one side of the smooth capacitor along its axial direction, and the snapping part is provided on the other side of the smooth capacitor along its axial direction. The latching part has two beams, a connecting part connecting the front ends of the two beams, and a claw part provided in the connecting part. The two beams extend along the radially outer side of the outer peripheral surface of the smooth capacitor to the other side of the axial direction of the smooth capacitor, and then extend radially inner side of the rotary motor away from the center axis of the smooth capacitor on the other side of the axial direction of the smooth capacitor.

2. The rotary electric motor device as described in claim 1, characterized in that, The capacitor holder is fixed to the bus holder.

3. The rotary electric motor device as described in claim 1, characterized in that, The busbar retainer has a fixing hole or a protrusion at its end, and the capacitor retainer has a protrusion or a fixing hole at its end. The protrusion is inserted into the fixing hole to fix the busbar retainer and the capacitor retainer.

4. The rotary electric motor device as described in claim 1, characterized in that, The capacitor holder has a main body portion disposed closer to the radially outer side of the rotary motor than the smooth capacitor, a pressing portion extending from the main body portion toward the radially inner side of the rotary motor on one side of the axial direction of the smooth capacitor, and a latching portion extending from the main body portion toward the radially inner side of the rotary motor on the other side of the axial direction of the smooth capacitor.

5. The rotary electric motor device as described in claim 1, characterized in that, The capacitor holder has a support portion that extends axially along the smooth capacitor between portions of the two beam portions extending along the outer peripheral surface of the smooth capacitor, thereby supporting the outer peripheral surface of the smooth capacitor.

6. The rotary electric motor device as claimed in claim 1, characterized in that, The two beams and the connecting portion do not contact the smooth capacitor, while the claw portion does contact the smooth capacitor, thereby holding the smooth capacitor in place.

7. The rotary electric motor device as claimed in claim 1, characterized in that, The claw portion of the capacitor holder is provided with a guide groove portion, which allows the end of the smooth capacitor opposite to the terminal to slide into it when the smooth capacitor is installed.

8. The rotary electric motor device as claimed in claim 1, characterized in that, The bus retainer includes a recess for receiving the claw portion of the capacitor retainer.

9. The rotary electric motor device as claimed in claim 1, characterized in that, The capacitor holder has ribs on the side opposite to the smooth capacitor.

10. The rotary electric motor device as claimed in claim 1, characterized in that, Multiple smooth capacitors are assembled to the capacitor holder with their terminals facing the same direction.

11. The rotary electric motor device as claimed in claim 1, characterized in that, Of the plurality of smooth capacitors, some have their terminals oriented toward one side, while others have their terminals oriented toward the opposite side, in order to be assembled to the capacitor holder.

12. The rotary electric motor device as claimed in claim 1, characterized in that, The capacitor holder is fixed to the bus holder by an adhesive.

13. The rotary electric motor device as claimed in claim 1, characterized in that, The smooth capacitor is fixed to at least one of the capacitor holder and the bus holder via an adhesive.

14. An electric power steering device, characterized in that, Includes the rotary electric motor device as described in any one of claims 1 to 13.

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