Control device and electric power steering device incorporating the control device

Abstract

Control device applied to an electric power steering device to assist a driver's steering operation, comprising: - a rotating electrical machine (10, 210) with a stator (12, 212) with a first winding group (13) and a second winding group (14) which are wound onto the stator in at least three phases, a rotor (15) which is rotatably arranged with respect to the stator, and a shaft (16) which rotates together with the rotor; - a substrate (41, 241, 341, 351, 355) that is arranged at an axial end of the rotating electrical machine; - a first control element (51-56) which (i) is arranged on a surface (42, 242, 342) of the substrate (41) in a first region (R1) and (ii) forms a first inverter (50) which switches a power supply to the first winding group; - a second control element (61-66) which (i) is arranged on the same surface of the substrate as the first control element in a second region (R2) and (ii) forms a second inverter (60) which switches a power supply to the second winding group, wherein the second region (R2) is symmetrical to the first region (R1) with respect to a shaft of the rotating electrical machine; - a first connecting line (135) extending from each of the at least three phases of the first winding group to be connected to the substrate; and - a second connecting line (145) extending from each of the at least three phases of the second winding group to be connected to the substrate, - wherein the first connecting line and the first control element, as well as the second connecting line and the second control element, each have reversed phase sequences in an arrangement of phase sequences from one end near a reference position to another end of the arrangement, such that magnetic leakage flux and variation in wiring impedance among the at least three phases are reduced, - wherein the reference position has an electrical energy supply area (Rin) which is (i) an area outside the first area (R1), the second area (R2) and a control element area (R3) which has a central axis (O) of the rotating electrical machine, and (ii) an area with a circuit pattern which supplies electrical energy from a battery (109) to the first and second inverters.

Description

[0001] The present invention generally relates to a control device and an electric power steering device comprising the control device.

[0002] It is known to position a motor and an inverter circuit for controlling the motor close together. For example, according to JP 2003-153 552 A (patent document 1), a printed circuit board with an inverter circuit mounted on it is housed in a casing that is then attached to the outer shell of a compressor.

[0003] Fig. Figure 4 in JP 2003-153 552 A shows six power semiconductor controllers arranged on a printed circuit board. However, JP 2003-153 552 A is silent regarding the phase sequence of the three-phase inverter.

[0004] Further relevant prior art is known from DE 11 2010 002 702 T5, US 2014 / 0153 198 A1, DE 10 2011 002 027 A1 and DE 10 2011 056 396 A1.

[0005] Furthermore, US 2012 / 0 194 109 A1 discloses an energy converter device used to drive a multiphase rotating electric machine of a power steering device. In addition, US 2013 / 0313 938 A1 and US 2014 / 0 077 733 A1 disclose a PWM control of a multiphase rotating electric machine of a power steering device.

[0006] The object of the present invention is to provide a control device that reduces variation in wiring length among multiple phases, and an electric power steering device using such a control device.

[0007] The problem is solved by the items with the features according to the independent claims.

[0008] According to one aspect of the present invention, the control device comprises a rotating electric machine (10, 210), a substrate (41, 241, 341, 351, 355), a first control element (51-56), a second control element (61-66), a first connecting line (135) and a second connecting line (145).

[0009] The rotating electric machine (10, 210) has a stator (12, 212) with a first winding group (13) and a second winding group (14) which are wound onto the stator in at least three phases. A rotor (15) is arranged relative to the stator, and a shaft (16) rotates together with the rotor.

[0010] The substrate (41, 241, 341, 351, 355) is located at an axial end of the rotating electric machine. The first control element (51-56) is arranged on a surface (42, 242, 342) of the substrate (41) in a first region (R1) and forms a first inverter (50) that switches a power supply to the first winding group. The second control element (61-66) is arranged on the same surface of the substrate as the first control element in a second region (R2) and forms a second inverter (60) that switches a power supply to the second winding group.

[0011] The second region is symmetrical to the first region with respect to a shaft of the rotating electrical machine. The first connecting lead (135) extends from each of the at least three phases of the first winding group to be connected to the substrate. The second connecting lead (145) extends from each of the at least three phases of the second winding group to be connected to the substrate.

[0012] The first connecting wire and the first control element, as well as the second connecting wire and the second control element, each have reversed phase sequences in an arrangement of phase sequences from one end near a reference position towards the other end of the arrangement. This reduces the variation in wiring lengths among the multiple phases on the substrate.

[0013] The tasks, features, and advantages of the present invention will become clearer from the following detailed description with reference to the accompanying drawings. The drawings show: Fig. 1 a system diagram of an electric power steering device according to a first embodiment of the present invention; Fig. 2 a schematic illustration of a circuit arrangement of a control device in the first embodiment of the present invention; Fig. 3 a sectional view of the control device in the first embodiment of the present invention; Fig. 4 a side view of the control device in the first embodiment of the present invention; Fig. 5 a top view of the control device along arrow V in the Fig. 4; Fig. 6 a bottom view of the control device along arrow VI in the Fig. 4; Fig. 7 a perspective exploded view of the control device in the first embodiment of the present invention; Fig. 8 a further perspective exploded view of the control device in the first embodiment of the present invention; Fig. 9 a side view of an ECU in the first embodiment of the present invention; Fig. 10. A bottom view of the ECU along arrow X in the Fig. 9; Fig. 11. A top view of the ECU along arrow XI in the Fig. 9; Fig. 12 a sectional view of the control device according to a second embodiment of the present invention; Fig. 13 a side view of the control device in the second embodiment of the present invention; Fig. 14 a side view of the control device, in which part of a cover element is located in the Fig. 13 is away; Fig. 15 a side view of the control device along arrow XV in the Fig. 14, in which part of the cover element has been removed; Fig. 16 a top view of a frame element side surface of a substrate in the second embodiment of the present invention; Fig. 17 a top view of an opposite surface of the substrate in the second embodiment of the present invention; Fig. 18 a sectional view of the control device according to a third embodiment of the present invention; Fig. 19 a sectional view of the control device according to a fourth embodiment of the present invention; and Fig. 20 a sectional view of the control device according to a fifth embodiment of the present invention.

[0014] The control device of the present disclosure and the electric power steering are described below with reference to the drawings. (First embodiment)

[0015] The control device of the first embodiment of the present disclosure and the electric power steering device are in the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. Figure 11 shows that, in all embodiments, identical parts are designated with the same reference numerals below to avoid redundancy.

[0016] A control device 1 is, as in Fig. Figure 1 shows an application to an electric power steering device 8 for assisting a driver's steering input. The control device 1 is a single-body combination of a motor 10, which serves as a rotating electric machine, and an ECU 40, which serves as a controller for controlling the motor 10.

[0017] Fig. Figure 1 shows a system diagram of a steering system 100 with the electric power steering device 8. The steering system 100 comprises a steering wheel 101, a steering column 102, a gear transmission 104, a rack 105, wheels 106, the electric power steering device 8 and the like, each serving as a component of the system.

[0018] The steering wheel 101 is connected to the steering column 102. The steering column 102 has a torque sensor 103 attached to it, which is used to detect a steering torque applied when the driver operates the steering wheel 101. At one end of the steering column 102 is the gear drive 104, which engages with the rack 105. At both ends of the rack 105, a pair of wheels 106 are arranged via a tie rod and the like.

[0019] Consequently, the steering column 102, connected to the steering wheel 101, rotates when the driver operates the steering wheel 101. The rotational movement of the steering column 102 is converted by the gear drive 104 into a translational movement of the rack 105, and the pair of wheels 106 is steered at an angle corresponding to the amount of displacement of the rack 105.

[0020] The electric power steering device 8 comprises a reduction gear 9, which serves as a power transmission component, and the control device 1. The electric power steering device 8 outputs the auxiliary torque from the motor 10 based on signals from the torque sensor 103 and the vehicle speed from a CAN (Control Area Network) (not shown) and transmits the torque via the reduction gear 9 to the steering column 102 to assist the steering operation of the steering wheel 101. That is, the electric power steering device 8 of the present embodiment is of the "column-assist" type, which assists rotation of the steering column 102 with the torque generated by the motor 10. However, the device 8 can also be used as a "rack-assist" type, which assists the control of the rack 105.More precisely, the steering column 102, which in the present embodiment serves as a “control object”, can be replaced by other objects, such as the rack 105.

[0021] The electrical configuration of the electric power steering device 8 is described below with reference to the Fig. 2 described. In the Fig. For the sake of readability, part of the control lines and the like has been omitted in Figure 2.

[0022] The motor 10 is a brushless three-phase motor and has a first winding group 13 and a second winding group 14, each wound on a stator 12, which are described below.

[0023] The first winding group 13 comprises a U-phase coil 131, a V-phase coil 132, and a W-phase coil 133. The second winding group 14 comprises a U-phase coil 141, a V-phase coil 142, and a W-phase coil 143.

[0024] The ECU 40 comprises a first inverter section 50, a second inverter section 60, power relays 71 and 72, counter-rotating protection relays 73 and 74, a control unit 80, a rotary angle sensor 85, capacitors 86 and 87, and an inductor 89, each mounted on a substrate 41, which is described below. In the present embodiment, the electronic components forming the ECU 40 are mounted on a single substrate 41. In such a configuration, the number of components of the ECU 40 is reduced compared to a case in which several substrates 41 are used, thereby reducing the volume of the control device 1.

[0025] The first inverter section 50 has six switching elements (SW elements) 51-56, combined in a bridge circuit, for switching the power supply to the first winding group 13. The second inverter section 60 has six SW elements 61-66 in a bridge circuit for switching the power supply to the second winding group 14.

[0026] Although the SW elements 51-56, 61-66 of the present embodiment are metal-oxide-semiconductor field-effect transistors (MOSFETs), other elements, such as insulated-gate bipolar transistors (IGBTs) and the like, can also be used.

[0027] As regards SW elements 51, 52 and 53, which are arranged on the high potential side of the first inverter part 50, the drain is connected to a positive electrode of a battery 109, which serves as an energy source, and the source is connected to the drain of SW elements 54, 55 and 56, which are arranged on the low potential side.

[0028] The source of SW elements 54, 55, and 56 is connected to a negative electrode of battery 109 via current sensing elements 57, 58, and 59. The nodes between SW elements 51, 52, and 53 on the high-potential side and SW elements 54, 55, and 56 on the low-potential side are connected to the U-phase coil 131, the V-phase coil 132, and the W-phase coil 133, respectively.

[0029] As regards the SW elements 61, 62 and 63, which are located on the high potential side of the second inverter part 60, the drain is connected to the positive electrode of the battery 109 and the source is connected to the drain of the SW elements 64, 65 and 66, which are located on the low potential side.

[0030] The source of SW elements 64, 65, 66 is connected to the negative electrode of battery 109 via current sensing elements 67, 68, 69. The nodes between SW elements 61, 62, 63 on the high-potential side and SW elements 64, 65, 66 on the low-potential side are connected to the U-phase coil 141, the V-phase coil 142, and the W-phase coil 143, respectively.

[0031] In the present embodiment, SW elements 51-56 correspond to "the multiple first control elements" or "the first control element" in the claims, and SW elements 61-66 correspond to "the multiple second control elements" or "the second control element." Furthermore, SW elements 51-53, 61-63 correspond to the "elements on the high-potential side" in the claims, and SW elements 53-56, 64-66 correspond to the "elements on the low-potential side."

[0032] The current sensing elements 57, 58, 59 are arranged on the low potential side of the SW elements 54-56, corresponding to the three phases of the first winding group 13, in order to detect the electric current in each of the three phases of the first winding group 13.

[0033] The current sensing elements 67, 68, 69 are arranged on the low potential side of the SW elements 64-66, corresponding to the three phases of the second winding group 14, in order to detect the electric current in each of the three phases of the second winding group 14.

[0034] The current sensing elements 57-59, 67-69 of the present embodiment are implemented as shunt resistors.

[0035] The power relay 71 is located at a position between the battery 109 and the first inverter part 50 and conducts or interrupts the electrical current between the battery 109 and the first inverter part 50.

[0036] The power relay 72 is located in a position between the battery 109 and the second inverter part 60 and conducts or interrupts the electrical current between the battery 109 and the second inverter part 60.

[0037] The counter-rotating protective relay 73 is located in a position between the power relay 71 and the first inverter section 50. The counter-rotating protective relay 74 is located in a position between the power relay 72 and the second inverter section 60.

[0038] The opposingly connected protection relays 73 and 74 prevent the electrical current from flowing in reverse direction to protect the ECU 40, for example in a case where the battery 109 is connected backwards, by having a parasitic diode switched in reverse direction with respect to the power relays 71 and 72.

[0039] In the present embodiment, the power relays 71 and 72 and the counter-connected protection relays 73 and 74 are all MOSFETs. However, other semiconductor devices, such as IGBTs and the like, can also be used as these relays 71 and 72. In the present embodiment, the power relays 71 and 72 correspond to a single "relay".

[0040] The control unit 80 includes a microcomputer 81, which serves as an electronic component and a computing circuit, and an application-specific integrated circuit (ASIC) 82, which serves as an integrated circuit (IC), along with other parts that are IC components.

[0041] The microcomputer 81 calculates a command value regarding the power supply to the first winding group 13 and to the second winding group 14 on the basis of the signal from the torque sensor 103 or the rotary angle sensor 85 and the like.

[0042] The ASIC 82 comprises a preamplifier, a signal amplifier, a regulator, and similar components. The preamplifier generates a control signal based on the command value and sends this signal to the first inverter section 50 and the second inverter section 60. More precisely, the preamplifier sends the generated control signal to the gate of SW elements 51-56 and 61-66. By switching SW elements 51-56 and 61-66 in accordance with the control signal, an alternating current, as specified in the command value, is supplied by the first inverter section 50 and the second inverter section 60 to the first winding group 13 and the second winding group 14, respectively. In this way, the motor 10 is operated.

[0043] The signal amplifier amplifies the detection signal (i.e., a voltage between the two terminals in the present embodiment) of the current detection elements 57-59, 67-69 and the detection value of the rotary angle sensor 85 and outputs these to the microcomputer 81. Furthermore, the controller is a stabilization circuit that stabilizes the voltage applied to the microcomputer 81 and the like.

[0044] The rotation angle sensor 85 is constructed from a magnetism detection element and detects a rotation angle of a rotor 15 by detecting a rotating magnetic field of a magnet 18, which is provided at another end 162 of a shaft 16, which is described below.

[0045] Capacitor 86 is connected in parallel to the first inverter section 50. Capacitor 87 is connected in parallel to the second inverter section 60. In the present embodiment, capacitors 86 and 87 are aluminum electrolytic capacitors and are located on the inverter side (i.e., on a side near inverter sections 50 and 60) of relays 71-74. The choke coil 89 is connected at a position between battery 109 and the positive electrodes of capacitors 86 and 87. In the present embodiment, the choke coil 89 is located on the battery side (i.e., on a side near battery 109) of relays 71-74.

[0046] Capacitors 86 and 87 and inductor 89 serve as a filter circuit that reduces the noise transmitted from the control device 1 to the other devices that share the power supply from battery 109 with the control device 1, and likewise reduces the noise transmitted from the other devices back to the control device 1, which share the battery 109. Capacitors 86 and 87 store electrical charge and support the electrical power supply of the first inverter section 50 and the second inverter section 60.

[0047] In the present embodiment, the first inverter section 50, the power relay 71, the counter-rotating protective relay 73, and the capacitor 86 are grouped as a first system 201, corresponding to the first winding group 13. Furthermore, the second inverter section 60, the power relay 72, the counter-rotating protective relay 74, and the capacitor 87 are grouped as a second system 202, corresponding to the second winding group 14. That is, the motor 10 is controlled in several systems, i.e., in two systems in the present embodiment.

[0048] Below is a diagram of the control device 1 with reference to the Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 described. In this context, an axial direction, i.e. a virtual line along the shaft of the motor 10, can simply be referred to as an “axial direction”, and a radial direction, i.e. a virtual line extending outwards from the shaft of the motor 10, can simply be referred to as a “radial direction”. Fig. Figure 3 shows a sectional view along line III-III in the Fig. 5.

[0049] The control device 1, as shown in the Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. 8 shown, the engine 10, a frame element 20, the ECU 40 and a cover element 90 together with other parts.

[0050] The engine 10, as shown in the Fig. Figure 3 shows a motor housing 11, the stator 12, the first winding group 13, the second winding group 14, the rotor 15, the shaft 16 and other parts.

[0051] The motor housing 11, for example, has a base part 111 and a cylinder part 114, is designed in the form of a cylinder that is closed at one end, i.e., has a base at one end, and is made of metal, such as aluminum. The motor housing 11 of the present embodiment is made of aluminum, and the surface of the housing 11 is anodized. The base part 111 of the motor housing 11 is located away from the ECU 40, i.e., on the opposite side, and an opening of the motor housing 11 is located near the ECU 40, i.e., on the ECU side. In the present embodiment, the cylinder part 114 corresponds to a "cylinder part of the rotating electric machine," and a projection area of ​​the cylinder part 114 in the axial direction corresponds to a "motor area."

[0052] A shaft hole 112, into which an end 161 of the shaft 16 is inserted, is arranged essentially in the middle of the base part 111. Furthermore, a bearing 166 is attached to the base part 111.

[0053] A fastening lug 116 is formed at or around the opening of the cylinder part 114 for the rigid mounting of the frame element 20, i.e., projecting radially outwards from an outer wall of the cylinder part 114. The fastening lug 116 has a screw hole 117 drilled into it. In the present embodiment, the fastening lug 116 is arranged at equal intervals around the cylinder part 114 at three positions.

[0054] The stator 12 has a layered section, i.e., a layered structure of a magnetizable thin metal, such as iron, and an insulator arranged radially outside the layered section and rigidly mounted within the motor housing 11. The number of thin metal laminations in the layered section of the stator 12 can be varied according to the required output power of the motor 10. Consequently, the output power of the motor 10 can be changed by altering the axial length of the stator 12 without changing the radial length of the motor 10.

[0055] The first winding group 13 and the second winding group 14 are wound on the insulator of the stator 12. For each of the three phases, a first motor lead 135 is brought out of the first winding group 13, and for each of the three phases, a second motor lead 145 is brought out of the second winding group 14. The motor leads 135 and 145 are brought out of the motor housing 11 in the direction of the ECU 40, i.e., they extend from the motor housing 11 towards the ECU 40 (see Fig. 7).

[0056] In the present embodiment, the first motor line 135 corresponds to a “first connection line” and the second motor line 145 to a “second connection line”.

[0057] The rotor 15 has a rotor core 151 and a permanent magnet 152. The rotor core 151 is, for example, in an approximately cylindrical shape and is made of a magnetic material, such as iron, and is arranged coaxially within the stator 12, i.e. radially within the stator 12.

[0058] The permanent magnet 152 is arranged radially outside the rotor core 151, with the N and S poles of the rotor core 151 alternating.

[0059] The shaft 16 is constructed in a rod-like form, for example from metal, and is fitted at the central position, i.e., on a rotational axis of the rotor core 151. The shaft 16 is rotatably held by the bearing 166, which is attached to the base 111 of the motor housing 11, and by a bearing 167, which is attached to the frame element 20. This allows the shaft 16 to rotate with the rotor 15. Furthermore, an outer wall of the rotor 15 and an inner wall of the stator 12 are arranged with an air gap between them.

[0060] One end 161 of the shaft 16 is inserted into the shaft hole 112, which is drilled into the base part 111 of the motor housing 11, and protrudes outside the motor housing 11. This one end 161 of the shaft 16 serves as an output end, which is connected to the reduction gear 9, for transmitting the torque from the motor 10 via the reduction gear 9 to the steering column 102 (see Fig. 1), even though a connection between the output end and the reduction gear 9 is not explicitly shown.

[0061] The other end 162 of the shaft 16 has a magnet retaining element part 17 that holds the magnet 18.

[0062] The frame element 20, made of a highly thermally conductive metal such as aluminum or the like, is, for example, as shown in the Fig. 3 and Fig. Figure 7 shows a frame element 20 formed in a lid shape for closing the opening of the engine housing 11, i.e., inserted into a radial inner surface of the cylinder part 114. One side of the frame element 20 near the engine 10 is hereby referred to as an engine-side surface 21, and the other side of the frame element 20 away from the engine 10 and near the ECU 40 is hereby referred to as an ECU-side surface 31.

[0063] A shaft hole 23 is drilled essentially in the center of the frame element 20. The other end 162 of the shaft 16 is inserted into the shaft hole 23. This exposes the magnet 18, which is located at the other end 162 of the shaft 16, to the ECU 40, i.e., the magnet 18 faces the ECU 40. The bearing 167 is attached to the frame element 20.

[0064] Furthermore, the frame element 20 has a motor cable insertion hole 24, into which the motor cable 135 is inserted, and a motor cable insertion hole 25, into which the motor cable 145 is inserted. Consequently, the motor cables 135 and 145 are routed out of these to extend towards the ECU 40.

[0065] The frame element 20 has a fastening lug 26 which projects radially outwards at corresponding positions (i.e., at three positions in the present embodiment) corresponding to the fastening lug 116 of the motor housing 11. The fastening lug 26 has a through-hole 27 drilled into it. A frame securing screw 38 is inserted into the through-hole 27 and screwed firmly into the screw hole 117. In this way, the frame element 20 is fastened to the motor housing 11.

[0066] An O-ring groove 29 is provided on the outer circumference of the frame element 20 and around the engine-side surface 21, which is closer to the base part 111 than the mounting lug 26. An O-ring 39 is fitted into this groove, and the O-ring 39, enclosed by the O-ring groove 29 and the cylinder part 114, provides a watertight seal. This prevents water and similar substances from entering the engine 10 via a point between the engine housing 11 and the frame element 20.

[0067] The ECU-side surface 31 of the frame element 20 has a substrate mounting lug 32, relay spaces 33 and 34, an ASIC space 35, a connector mounting groove 36 and an adhesion groove 37.

[0068] The ECU 40 is, as in the Fig. As shown in Figures 3, 7-11, the frame element 20 is positioned away from the motor 10, i.e., with the frame element 20 lying between them. The ECU 40 is positioned essentially within the motor area and is arranged essentially coaxially with the motor 10.

[0069] The ECU 40 features the substrate 41, to which many electronic components are attached.

[0070] The substrate 41 is shaped to fit within the motor area. More practically, in the present embodiment, the substrate 41 is contained within the groove area, i.e., radially within the adhesion groove 37 provided on the ECU-side surface 31 of the frame element 20. More precisely, the ECU components on the substrate 41, such as the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the capacitors 86 and 87, and the choke coil 89, are positioned within the motor area.

[0071] In this document, one side of the substrate 41 near the motor 10 is designated as a heat-generating element mounting surface 42, and the other side, a side facing away from the motor 10, is designated as an electronic component mounting surface 43.

[0072] The SW elements 51-56, 61-66, as well as the current sensing elements 57-59, 67-69, the power relays 71 and 72, the counter-wired protection relays 73 and 74, the ASIC 82 and the rotary angle sensor 85 are, as in the Fig. 8 and Fig. 10, together with other parts, surface-mounted on the heat-generating element mounting surface 42. The rotary angle sensor 85 is in the Fig. 10 omitted. In the Fig. Figure 11 shows a dashed line indicating an area where a molded package of the ASIC 82 is located.

[0073] The rotary angle sensor 85 is essentially mounted at a central position on the heat-generating element mounting surface 42, facing the magnet 18, which is exposed by the frame element 20. Herein, if the axis line of the shaft 16 and its extension are considered to be the central axis O of the motor 10, the rotary angle sensor 85 is mounted on the central axis O of the heat-generating element mounting surface 42 (see Fig. 3).

[0074] A first area R1, in which the SW elements 51-56 and the current sensing elements 57-59 of the first inverter part 50 are mounted, and a second area R2, in which the SW elements 61-66 and the current sensing elements 67-69 of the second inverter part 60 are mounted, are arranged symmetrically on opposite sides of the central axis O of the motor 10. In the present embodiment, the SW elements 51-56 and the SW elements 61-66 are arranged axially symmetrically on both sides of a straight line passing through the central axis O of the motor 10.

[0075] Furthermore, if a control element area R3 is defined as an area comprising the first area R1, the second area R2, and the central axis O, (i) the power supply relays 71, 72, and the counter-connected protection relays 73, 74, and (ii) the ASIC 82 are positioned outside the control element area R3 on opposite sides of the area R3. That is, the component group (i) described above is positioned on one side of the area R3, and the component (ii) described above is positioned on the other side of the area R3.

[0076] A motor cable insertion section 44 is formed radially outside the first region R1. Motor cable insertion section 44 contains the motor cable 135, which is inserted into it. A motor cable insertion section 45 is formed radially outside the second region R2. Motor cable insertion section 45 contains the motor cable 145, which is inserted into it.

[0077] In the present embodiment, the areas R1 to R3 are rectangular areas; however, the areas R1 to R3 can have any shape other than rectangular shapes, depending on the realization positions of the SW elements 51-56, 61-66 and the current sensing elements 57-59, 67-69, such as a polygonal shape that includes all elements.

[0078] Furthermore, the SW elements 54-56, which are connected to the side of low potential, are arranged on the outside of the SW elements 51-53, which are connected to the side of high potential, and the current sensing elements 57-59 are arranged further outside of these.

[0079] Similarly, the SW elements 64-66, which are connected to the low potential side, are arranged on the outside of the SW elements 61-63, which are connected to the high potential side, and the current sensing elements 67-69 are arranged further outside of these.

[0080] On one side of each of the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the power relays 71, 72, the counter-connected protection relays 73, 74 and the ASIC 82, which are attached to the heat-generating element mounting surface 42, i.e. a side facing the frame element 20, a heat dissipation form (slug) made of a thermally conductive material, such as copper, is arranged.

[0081] Furthermore, the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the power relays 71, 72, the counter-wired protective relays 73, 74, and the ASIC 82 each contact the ECU-side surface 31 of the frame element 20 in a heat-transferring manner via a thermal paste (not shown). In this way, heat generated by the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the power relays 71, 72, the counter-wired protective relays 73, 74, and the ASIC 82 is dissipated to the frame element 20 via the thermal paste. Fig. In Figure 3 or further figures, the ASIC 82 and the frame element 20 may appear to be arranged in a non-contact state, since the thermal paste is omitted. That is, the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the power relays 71 and 72, the counter-connected protection relays 73 and 74, and the ASIC 82 form or describe a heat-generating element 70 in the present embodiment.

[0082] The power relays 71 and 72, which are large elements compared to the SW elements 51-56, 61-66 and the counter-connected protection relays 73 and 74, are housed in the relay spaces 33 and 34, which are provided on the ECU-side surface 31 of the frame element 20.

[0083] The ASIC 82, which is a large element compared to the SW elements 51-56, 61-66 and the opposingly connected protection relays 73 and 74, is housed in the ASIC space 35, which is provided on the ECU-side surface 31 of the frame element 20.

[0084] In the present embodiment, the frame element 20 defines an outline of the motor 10, provides support for the ECU 40, and forms a heat dissipation path for dissipating heat from the heat-generating element 70. In this way, compared to a case in which a heat sink is provided separately, the number of components and the overall volume of the control device are reduced.

[0085] The motor leads 135 and 145 and the phase sequence of the inverter sections 50 and 60 are described below. According to the present embodiment, in the Fig. Figure 10 shows a circuit pattern of the substrate 41 connected to the drain of the power relays 71, 72, illustrated by a dashed line and designated as an electrical power supply area Rin. The electrical power supply area Rin lies outside the first area R1, the second area R2, and the control element area R3, including the center axis O of the motor 10, and is an area containing the circuit pattern that supplies electrical power from the battery 109 to the first inverter section 50 and the second inverter section 60.

[0086] According to the present embodiment, the electrical energy supply area Rin corresponds to a “reference position” in the claims.

[0087] The motor line 135 is, as in the Fig. 7 and Fig. Figure 10 shows a first U-phase motor lead 136 connected to a U-phase coil 131, a first V-phase motor lead 137 connected to a V-phase coil 132, and a first W-phase motor lead 138 connected to a W-phase coil 133. In the present embodiment, the first U-phase motor lead 136, the first V-phase motor lead 137, and the first W-phase motor lead 138 are arranged sequentially from the electrical power supply area Rin side to be inserted into the motor lead insertion section 44 of the substrate 41. In the present embodiment, the first U-phase motor line 136, the first V-phase motor line 137 and the first W-phase motor line 138 are positioned along a straight line on an outside of the current sensing elements 57-59 on the substrate 41.Furthermore, the same interval is provided between the first U-phase motor line 136 and the first V-phase motor line 137, and between the first V-phase motor line 137 and the first W-phase motor line 138. More precisely, the first U-phase motor line 136 and the first W-phase motor line 138 are positioned symmetrically with respect to the first V-phase motor line 137.

[0088] Furthermore, the motor cable 145 is composed of a second U-phase motor cable 146, which is connected to a U-phase coil 141, a second V-phase motor cable 147, which is connected to a V-phase coil 142, and a second W-phase motor cable 148, which is connected to a W-phase coil 143. In the present embodiment, the second W-phase motor cable 148, the second V-phase motor cable 147, and the second U-phase motor cable 146 are arranged sequentially from the side of the electrical power supply area Rin in order to be inserted into the motor cable insertion section 44 of the substrate 41. In the present embodiment, the second U-phase motor line 146, the second V-phase motor line 147 and the second W-phase motor line 148 are positioned along a straight line on an outside of the current sensing elements 67-69 on the substrate 41.Furthermore, the same interval is provided between the second U-phase motor line 146 and the second V-phase motor line 147, and between the second V-phase motor line 147 and the second W-phase motor line 148. More precisely, the second U-phase motor line 146 and the second W-phase motor line 148 are positioned symmetrically with respect to the second V-phase motor line 147.

[0089] In the present embodiment, the first U-phase motor lead 136 and the second U-phase motor lead 146 are arranged point-symmetrically with respect to the central axis O of the motor 10. Similarly, the first V-phase motor lead 137 and the second V-phase motor lead 147 are arranged point-symmetrically with respect to the central axis O of the motor 10, and the first W-phase motor lead 138 and the second W-phase motor lead 148 are arranged point-symmetrically with respect to the central axis O of the motor 10.

[0090] In such a structure, the magnetic leakage flux from the first motor lead 135 and the magnetic leakage flux from the second motor lead 145 cancel each other out, thereby reducing the influence of the magnetic leakage flux on the rotary angle sensor 85 attached to the central axis O of the motor 10. "Symmetry" here describes an essentially symmetrical arrangement of these leads to cancel out the magnetic leakage flux, which allows for a dimensional error in the actual product.

[0091] Furthermore, the distance between the two motor leads, i.e., between the first U-phase motor lead 136 and the first V-phase motor lead 137 or between the first V-phase motor lead 137 and the first W-phase motor lead 138, is reduced to a minimum, i.e., to a minimum value, as long as the motor leads do not contact each other, so that the magnetic leakage flux is minimized. The same applies to the second motor lead 145.

[0092] The first inverter section 50, like the first motor line 135, has the phase arrangement U-phase, V-phase, and W-phase from the electrical power supply side Rin. More precisely, the SW elements 51, 52, and 53, which are connected to the high-potential side, are arranged from the electrical power supply side Rin in the sequence U-phase SW element 51, V-phase SW element 52, and W-phase SW element 53. Furthermore, the SW elements 54, 55, and 56, which are connected to the low-potential side, are arranged from the electrical power supply side Rin in the sequence U-phase SW element 54, V-phase SW element 55, and W-phase SW element 56.Similarly, the current sensing elements 57, 58, 59 are arranged from the side of the electrical energy supply area Rin in the sequence current sensing element 57, which detects the electric current of the U-phase coil 131, current sensing element 58, which detects the electric current of the V-phase coil 132, and current sensing element 58, which detects the electric current of the W-phase coil 133.

[0093] The second inverter section 60, like the second motor line 145, has the phase arrangement W-phase, V-phase, and U-phase from the electrical power supply side Rin. More precisely, the SW elements 61, 62, and 63, which are connected to the high-potential side, are arranged from the electrical power supply side Rin in the sequence W-phase SW element 63, V-phase SW element 62, and U-phase SW element 61. Furthermore, the SW elements 64, 65, and 66, which are connected to the low-potential side, are arranged from the electrical power supply side Rin in the sequence W-phase SW element 66, V-phase SW element 65, and U-phase SW element 64.Similarly, the current sensing elements 67, 68, 69 are arranged from the side of the electrical energy supply area Rin in the order current sensing element 69, which senses the electric current of the W-phase coil 143, current sensing element 68, which senses the electric current of the V-phase coil 142, and current sensing element 67, which senses the electric current of the U-phase coil 141.

[0094] Herein, the wiring length of the U-phase is defined as the sum of the wiring length from the electrical power supply area Rin to motor cable 136 and the wiring length from the electrical power supply area Rin to motor cable 146. Similarly, the wiring length of the V-phase is defined as the sum of the wiring length from the electrical power supply area Rin to motor cable 137 and the wiring length from the electrical power supply area Rin to motor cable 147. Furthermore, the wiring length of the W-phase is defined as the sum of the wiring length from the electrical power supply area Rin to motor cable 138 and the wiring length from the electrical power supply area Rin to motor cable 148.

[0095] In the present embodiment, the first system 201 has a phase sequence of U, V, W phases from the side of the electrical power supply area Rin, and the second system 202 has a phase sequence of W, V, U from the side of the electrical power supply area Rin. More precisely, the first system 201 and the second system 202 have a reversed phase sequence with respect to the phase sequence of the power supply from the side of the electrical power supply area Rin. Furthermore, in the present embodiment, the distance from the center of the electrical power supply area Rin to the center of the first area R1 and the distance from the center of the electrical power supply area Rin to the center of the second area R2 are essentially the same.

[0096] Consequently, the U-phase wiring length, the V-phase wiring length, and the W-phase wiring length vary very slightly. In particular, by arranging (a) the SW elements 51-56 and the current sensing elements 57-59 and (b) the SW elements 61-66 and the current sensing elements 67-69 symmetrically, by forming the circuit pattern on the substrate 41 symmetrically, and by arranging the first motor line 135 and the second motor line 145 symmetrically, the variation in the U-phase wiring length, the V-phase wiring length, and the W-phase wiring length is further reduced. This reduction in wiring length thus allows for a reduction in the variation in wiring impedances among the different phases.

[0097] Furthermore, the phase sequence is the same in both the first inverter section 50 and the first motor line 135, and in each phase, the SW elements 51-53 are located on the high-potential side, the SW elements 54-56 on the low-potential side, the current-sensing elements 57-59, and the motor lines 136-138 are arranged radially outside the substrate 41 from the side of the central axis O. In each of the SW elements 51-56, the drain is formed on the side facing the substrate 41, and the wiring pattern connected to the drain of the SW elements 54-56 on the low-potential side and the motor line 135 are connected. Consequently, compared to a case where the SW elements 51-53 are arranged on the high potential side outside, the wiring on the substrate 41 is simplified by arranging the SW elements 54-56 on the low potential side in the position outside the SW elements 51-53 on the high potential side.

[0098] The same applies to the second inverter part 60 and the second motor line 145.

[0099] The microcomputer 81, the capacitors 86, 87 and the choke coil 89 are, as in the Fig. 7 and Fig. 11, shown, is attached, along with other parts, to the electronic component mounting surface 43. The microcomputer 81 is mounted at a position on a rear side of the substrate 41 that overlaps at least partially with the ASIC 82.

[0100] Capacitor 86 is attached to the rear side of substrate 41, i.e., overlapping at least partially with the first region R1, in which the SW elements 51-56 of the first inverter section 50 are mounted. Capacitor 87 is attached to the rear side of substrate 41, i.e., overlapping at least partially with the second region R2, in which the SW elements 61-66 of the second inverter section 60 are mounted. The noise reduction effect is increased by the placement of capacitors 86 and 87 on the rear side of inverter sections 50 and 60.

[0101] In the present embodiment, by mounting relatively large electronic components, such as the capacitors 86, 87 and the inductor 89, on the electronic component mounting surface 43, the substrate 41 is positioned near the frame element 20. In this way, heat generated by the heat-generating element 70 on the heat-generating element mounting surface 42 is dissipated from the "back" of these components to the frame element 20.

[0102] On the electronic component mounting surface 43, a motor cable connector 46 made of a conductive metal or the like is provided at a position where the motor cable insertion holes 44 and 45 are drilled. The motor cable connector 46 has a press-fit or press-in part, wherein the press-fit part, which receives the motor cables 135 and 145, establishes an electrical connection between the substrate 41 and the motor cables 135, 145.

[0103] A hole 48 is drilled at a position corresponding to the substrate fastening lug 32 of the substrate 41. A substrate securing screw 49 (see Fig. 7 and Fig. 8) is inserted into the hole 48 and screwed firmly to the substrate fastening lug 32 of the frame element 20. In this way, the substrate 41 is attached to the frame element 20.

[0104] A cover element 90 has, as shown in the Fig. Figures 3-8 show a cover body 91, a power supply connector 96 and a signal connector 97, and cover the side of the electronic component mounting surface 43 of the substrate 41.

[0105] An insertion section 921 is provided at one end of a circumferential wall 92 of the cover body 91. The insertion section 921 is inserted into the adhesion groove 37 of the frame element 20 and secured by the adhesive. This prevents water or the like from penetrating the motor 10 via a connection section between the frame element 20 and the cover element 90.

[0106] A capacitor chamber 93 is formed essentially in the center of the cover body 91. The capacitor chamber 93 projects from the cover body 91, i.e., away from the motor 10, to accommodate the capacitors 86 and 87. An air hole 94 is drilled into the capacitor chamber 93. The air hole 94 is closed by a filter element 95 attached to it. The filter element 95 is made of a material that is permeable to air but not to water. Due to the filter element 95 in the air hole 94, the internal pressure of the control device 1 remains constant at a certain value even with temperature changes.

[0107] The power supply connector 96 and the signal connector 97 (hereinafter referred to as "connectors 96 and 97") each project away from the cover body 91, i.e., from the motor 10. In the present embodiment, the connectors 96 and 97 are formed integrally with the cover body 91.

[0108] The power supply connector 96 has an opening 961 located at one end extending away from the motor 10, for connection to a cable harness (not shown) extending from the battery 109. The power supply connector 96 also has a power supply connector terminal 962, which is connected to the substrate 41. The power supply connector terminal 962 is inserted into a terminal insertion hole 965 drilled into the substrate 41 and is connected to the substrate 41 by solder or the like. In this way, the ECU 40 is connected to the battery 109.

[0109] The signal connector 97 has an opening 971 located at one end extending away from the motor 10 for connection to a cable harness (not shown). In the present embodiment, two signal connectors 97 are provided, one of which is connected to a cable harness extending from the torque sensor 103, and the other of which is connected to a cable harness extending from the CAN bus. The signal connector 97 also has a signal connector terminal 972 that is connected to the substrate 41. The signal connector terminal 972 is inserted into a terminal insertion hole 975 located on the substrate 41 and is connected to the substrate 41 by solder or the like. In this way, information from the torque sensor 103 and information from the CAN bus are transmitted to the ECU 40.

[0110] The tips of both the power supply connector terminal 962 and the signal connector terminal 972 (hereinafter referred to as the “terminals 962 and 972”) are inserted into the terminal receiving groove 36 formed on the ECU-side surface 31 of the frame element 20, so that the terminals 962, 972 and the frame element 20 are not short-circuited to each other.

[0111] The control device 1 of the present embodiment comprises, as described in more detail above, the motor 10, the substrate 41, the SW elements 51-56, the SW elements 61-66, the first motor line 135 and the second motor line 145.

[0112] The motor 10 is a three-phase motor in which the stator 12 with the first winding group 13 and the second winding group 14 wound on it, the rotor 15 rotatable with respect to the stator 12 and the shaft 12 rotating with the rotor 15 are provided.

[0113] The substrate 41 is arranged at one side end of the shaft 16 of the motor 10.

[0114] The SW elements 51-56, which form the first inverter part 50 that switches the power supply to the first winding group 13, are arranged on the heat generating element mounting surface 42, which is a surface of the substrate 41.

[0115] The SW elements 61-66, which form the second inverter part 60, which switches the power supply to the second winding group 14, are attached to the same surface of the substrate 41 as the SW elements 51-56 and are arranged in the second area R2, which is on a side opposite the first area R1 with respect to the central axis O of the motor 10 in which the SW elements 51-56 are attached.

[0116] The first motor conductor 135 is led out of each of the several phases of the first winding group 13 and arranged on the substrate 41.

[0117] The second motor line 145 is led out of each of the several phases of the second winding group 14 and arranged on the substrate 41.

[0118] The phase sequence from the side of the electrical energy supply area Rin on the substrate 41 is reversed, in a first group of the first motor line 135 and the SW elements 51-56 and in a second group of the second motor line 145 and the SW elements 61-66.

[0119] More precisely, if phases U, V, W are each designated as the first, second and third phases, the sequence of phases in the first group of the first motor line 135 and the SW elements 51-56, from the side of the electrical power supply area Rin, is the first phase (= U-phase), the second phase (= V-phase) and the third phase (= W-phase), and the sequence of phases in the second group of the second motor line 145 and the SW elements 61-66, from the side of the electrical power supply area Rin, is the third phase (= W-phase), the second phase (= V-phase) and the first phase (= U-phase).

[0120] According to the present embodiment, the phase sequence from the reference position side (i.e., from the side of the electrical power supply area Rin in the present embodiment) is (i) in the first group of the first motor line 135 and the SW elements 51-56, which describe the first system 201, and (ii) in the second group of the second motor line 145 and the SW elements 61-66, which describe the second system 202, a reverse sequence. In this way, a variation in the wiring lengths in the different phases on the substrate 41 is reduced, thereby reducing the variation in impedance among the different phases.

[0121] The reference position is the electrical power supply area Rin, which describes an outer surface of the first area R1, the second area R2, and the control element area R3, including the central axis O of the motor 10, and is an area containing the circuit pattern that supplies electrical power from the battery 109 to the first inverter section 50 and the second inverter section 60. That is, in the present embodiment, the arrangement of the first motor lead 135 and the SW elements 51-56 and the arrangement of the second motor lead 145 and the SW elements 61-66 are reversed with respect to the phase sequence from the Rin side. Consequently, the variation in wiring lengths for a section of the wiring extending from the electrical power supply area Rin to the motor leads 135 and 145 is reduced, thereby decreasing the variation in impedances in each of the multiple phases.

[0122] The control device 1 further comprises the power relays 71, 72, which can switch the supply of electrical current from the battery 109 to the first inverter section 50 or the second inverter section 60. The power relays 71, 72 are mounted in the electrical power supply area Rin on the heat-generating element mounting surface 42, which is the surface with the SW elements 51-56, 61-66. By arranging the power relays 71, 72 in the electrical power supply area Rin, the wiring on the substrate 41 is simplified and a mounting area of ​​the substrate 41 is used efficiently.

[0123] The control device 1 further comprises the frame element 20, which is arranged at a position between the motor 10 and the substrate 41.

[0124] The SW elements 51-56, 61-66 are attached to the heat-generating element mounting surface 42, which is a surface of the substrate 41 facing the frame element 20, in a heat-dissipating manner to transfer heat to the frame element 20. That is, the frame element 20 serves as an outline of the motor 10 and also as a heat sink. In this way, compared to the case where a heat sink is provided separately, the volume of the control device 1 is reduced, particularly in the axial direction, by decreasing the number of components.

[0125] The first motor lead 135 is radially connected to the substrate 41 outside the first area R1. The second motor lead 145 is radially connected to the substrate 41 outside the second area R2. In this way, the mounting area of ​​the substrate 41 is used efficiently.

[0126] The control device 1 further comprises the current sensing elements 57-59, 67-79, which detect the power supply to each of the phases in the first winding group 13 or the second winding group 14. The current sensing elements 57-59, 67-79 are attached at positions between the SW elements 51-56 and the first motor lead 135 or positions between the SW elements 61-66 and the second motor lead 145 on the same surface of the substrate 41 as the SW elements 51-56, 61-66.

[0127] Consequently, the electric current is detected in the first winding group 13 or in the second winding group 14 in a suitable manner.

[0128] Regarding SW elements 51-56, 61-66, SW elements 51-53, 61-63 are arranged on the high-potential side near the central axis O of the motor 10, and SW elements 54-56, 64-66 are arranged on the low-potential side outside the SW elements 51-53, 61-63 on the high-potential side. By arranging the SW elements in this way, the wiring on the substrate 41 is simplified compared to a case where SW elements 51-53, 61-63 are arranged on the outside at high potential.

[0129] The first motor lead 135 and the second motor lead 145 are arranged point-symmetrically with respect to the central axis O of the motor 10 on the substrate 41. This results in the corresponding phases of the first motor lead 135 and the second motor lead 145 being arranged point-symmetrically, which cancels out the magnetic leakage fluxes and reduces the overall magnetic leakage flux. Furthermore, if the rotation angle sensor 85 is arranged on the central axis O of the motor 10, the detection error of the rotation angle sensor 85 under the influence of the magnetic leakage flux is reduced.

[0130] For the first motor line 135 and the second motor line 145, the middle phase of the three phases serves as a reference phase for the phases on both sides. That is, in the first motor line 135 and the second motor line 145, the V-phase serves as a standard or reference phase for the symmetrical arrangement of the U-phase and the W-phase on both sides. This reduces the variation in wiring lengths among the different phases and further reduces the variation in impedance between the different phases.

[0131] On substrate 41, the motor leads 136, 137 and 138 are arranged along a straight line.

[0132] On substrate 41, the motor leads 146, 147 and 148 are arranged along a straight line.

[0133] The control device 1 of the present embodiment is applied to the electric power steering device 8. That is, the electric power steering device 8 has the control device 1 and the reduction gear 9 for transmitting a torque output by the motor 10 to the steering column 102, controlling the steering column 102 with the torque of the motor 10 and assisting the steering operation of the steering wheel 101 by a driver.

[0134] The control device 1 of the present embodiment comprises the motor 10 and the ECU 40, which are arranged substantially coaxially, has a reduced product volume in the axial direction, and is essentially contained within the motor area. This allows the control device 1 to be installed even in a small space. Furthermore, since the O-ring 39 is positioned between the motor housing 11 and the substrate 20, and the substrate 20 and the cover element 90 are bonded with the adhesive, the control device 1 of the present embodiment has a watertight structure. Consequently, the control device 1 can, for example, be installed in an engine compartment. More specifically, the control device 1 is suitable for use with a rack-and-pinion electric power steering system. (Second embodiment)

[0135] The control device according to a second embodiment of the present invention is in the Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16 to Fig. 17 shown. Fig. Figure 12 shows a sectional view along line XII-XII in the Fig. 15. In the figures of the present embodiment, capacitors 86 and 87 are not shown in some cases.

[0136] A control device 2 comprises a motor 210 as a rotating electric machine, a front frame end 215, a rear frame end 220, an ECU 240 as a controller, a connector 280, a cover element 290, and the like. In the present embodiment, the rear frame end 220 corresponds to a "substrate" in the claims. The electrical configuration of the control device 2 is the same as that of the embodiment described above and is not described again below.

[0137] The 210 engine, as shown in the Fig. 12, Fig. 13, Fig. 14 to Fig. Figure 15 shows a stator 212, the rotor 15, the shaft 16 and the like.

[0138] The stator 212 has the front frame end 215 and the rear frame end 220 attached to it. In the present embodiment, a motor housing is omitted, leaving the stator 212 exposed. Otherwise, the stator 212 corresponds to the stator 12 in the embodiment described above. That is, in the control device 2 of the present embodiment, the stator 212 is "naked" and does not have a waterproof structure. Consequently, the control device 2 of the present embodiment can preferably be arranged in a vehicle interior and applied to a column-assisted electric power steering system.

[0139] In the present embodiment, since the motor housing is omitted, a projection area or a “silhouette” of the stator 212 can be considered a “motor area”.

[0140] The front frame end 215 is constructed of metal, such as aluminum or the like, and is located at the opposite end of the engine 210 from the ECU 240. The front frame end 215 has a shaft hole 216, which is drilled essentially in its center. The bearing 166 is attached to the front frame end 215, with one end 161 of the shaft 16 being inserted into it. One end 161 of the shaft 16 is exposed from the front frame end 215. This one end 161 of the shaft 16 is designed as an output end 165. The output end 165 is connected to the reduction gear 9. In this way, the torque generated by the rotation of the rotor 15 and the shaft 16 is transmitted to the steering column 102 via the reduction gear 9.

[0141] The rear frame end 220, as shown in the Fig. 12, Fig. 13, Fig. 14 to Fig. Figure 15 shows, for example, a frame part 222, a heat sink 230, and a connector receiving part 236, and is constructed of a thermally conductive metal, such as aluminum or the like, and is located on the side of the ECU 240 of the motor 210. The front frame end 215 and the rear frame end 220 are joined using a through bolt (not shown), with the motor 210 positioned between them. Furthermore, the rear frame end 220 has a motor cable insertion hole (not shown) drilled into it. The motor cables 135 and 145 are inserted into the motor cable insertion hole and routed out to extend towards the ECU 240.

[0142] The frame part 222 has a ring shape and is attached to the stator 212 of the motor 210.

[0143] The heat sink 230 is attached to the frame part 222 and rests on the frame part 222 to extend towards the ECU 240.

[0144] A shaft hole 231 is drilled on the central axis O of the cooling sink 230. The shaft hole 231 has a bearing 167 arranged therein, with another end 162 of the shaft 16 being inserted into this bearing. In this way, the magnet 18 provided at the other end 162 of the shaft 16 is exposed to the ECU 240.

[0145] A substrate mounting element 232 is provided on an outer surface of the heat sink 230. An ECU-side surface of the heat sink 230 is formed as a radiation surface 235.

[0146] The connector receiver 236 projects radially outwards from the heat sink 230. A connector 280 is arranged next to the connector receiver 236 on the side of the ECU 240. The connector receiver 236 and the connector 280 are separated from each other by a gap.

[0147] The ECU 240 is located on the opposite side of the rear frame end 220 with respect to the engine 210 and is essentially coaxial with the engine 210.

[0148] The ECU 240 has a substrate 241 to which various electronic components are attached.

[0149] The substrate 241 assumes a shape that fits into the projection area of ​​the rear frame end 220. Furthermore, the components of the ECU 240, i.e., the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the capacitors 86 and 87, and the choke coil 89, which are attached to the substrate 241, are contained within the engine area.

[0150] Herein, a motor-side surface of the substrate 241, facing the motor 210, is designated as a heat-generating element mounting surface 242, and an opposite surface of the substrate 241, facing away from the motor 210, is designated as an electronic component mounting surface 243. In the present embodiment, the heat-generating element mounting surface 242 corresponds to a “surface” in the claims.

[0151] The heat-generating element mounting surface 242 exhibits, as shown in Fig. 16 shown, the SW elements 51-56, 61-66, the current sensing elements 57-59, the power relays 71 and 72, the counter-connected protection relays 73 and 74, the ASIC 82, the rotary angle sensor 85 and the like attached to it.

[0152] In the present embodiment, the SW elements 51-56, 61-66, the current sensing elements 57-59, 67-69, the power relays 71 and 72, the counter-wired protection relays 73 and 74, and the ASIC 82 each contact the radiating surface 235 of the heat sink 230 of the rear frame end 220 via the thermal paste in a heat-dissipating manner. In this way, heat generated by the SW elements 51-56, 61-66, the power relays 71 and 72, the counter-wired protection relays 73 and 74, and the ASIC 82 is dissipated to the rear frame end 220 via the thermal paste. Furthermore, the microcomputer 81 is mounted on the electronic component mounting surface 243 in an area that at least partially overlaps with the ASIC 82 (see Fig. 12 and Fig. 17).

[0153] In the present embodiment, the SW elements 51-56, which form the first inverter part 50, and the SW elements 61-66, which form the second inverter part 60, are arranged symmetrically around the central axis O of the motor 210 (i.e., in the present embodiment, a part in which the rotation angle sensor 85 is located). In the present embodiment, the SW elements 51-56 and the SW elements 61-66 are arranged in a point-symmetrical manner around the central axis O of the motor 210. Furthermore, the phase sequence is arranged in the same way as in the embodiment described above, i.e., the U, V, and W phases are arranged sequentially from the side of the electrical power supply area Rin in the first inverter part 50, and the W, V, and U phases are arranged sequentially from the side of the electrical power supply area Rin in the second inverter part 60.

[0154] The arrangement and other details not mentioned above regarding the electronic components on substrate 241 also correspond to the embodiment described above.

[0155] A motor conductor insertion section 244 is drilled at a radially outer position on a part of the substrate 41 that is further outward than the first area R1, in which the elements forming the first inverter part 50 on the substrate 241 are attached, with respect to the central axis O. The motor conductor 135 is inserted into the motor conductor insertion section 244 and connected to the section 244 by means of solder or the like.

[0156] A motor conductor insertion section 245 is drilled at a radially outer position on a part of the substrate 41 that is further outward than the second area R2, in which the elements forming the second inverter part 60 on the substrate 241 are attached, with respect to the central axis O. The motor conductor 135 is inserted into the motor conductor insertion section 245 and connected to the section 245 by means of solder or the like.

[0157] The motor lead insertion sections 244 and 245 are positioned on a circle C whose center lies on the central axis O. That is, the motor leads 135 and 145 are arranged on the substrate 241 on the circle C. In the present embodiment, the motor leads 135 and 145 extend from the winding groups 13 and 14, whose winding wire is wound on the stator 212, which has a ring shape. Due to the arrangement of the motor lead insertion sections 244 and 245 on the same circle, the motor leads 135 and 145 extend from the stator 212 directly towards the substrate 241, so that the motor leads 135 and 145 can be easily connected to the substrate 241.

[0158] A hole 248 is drilled at a position corresponding to the substrate fastening part 232 of the substrate 241. A substrate securing screw 49 is inserted into the hole 248 and screwed into the substrate fastening part 232 of the rear frame end 220. In this way, the substrate 241 is fastened to the rear frame end 220.

[0159] The substrate 241 has an arc-shaped section 251 and a connector fastening section 252, which is arranged radially outside the arc-shaped section 251. The connector fastening section 252 has a hole 253 drilled into it, into which a connector locking screw 289 is inserted.

[0160] The connector mounting part 252 is positioned outside the power relays 71 and 72 and the counter-connected protective relays 73 and 74 on the heat-generating element mounting surface 242 of the substrate 241, and the connector 280 is positioned on the connector mounting part 252.

[0161] The connector 280 is, as in the Fig. 12, Fig. 13, Fig. 14 to Fig. 15 shown, attached to the substrate 241 by means of the connector locking screw 289, which is inserted from the side of the electronic component mounting surface 243 of the substrate 241.

[0162] The connector 280 is made of resin or a similar material, arranged to project radially outward from the substrate 241, and positioned on the side of the ECU 240 facing the rear frame end 220 near the connector receiving part 236, i.e., the connector 280 is positioned between the rear frame end 220 and the ECU 240. More precisely, the connector 280 is positioned on the side of the ECU 240 of the frame part 222 near the connector receiving part 236 of the rear frame end 220, with the positioning of the connector 280 on the controller side of the frame part being described in more detail below.

[0163] In the present embodiment, the connector 280 is positioned on the side of the heat-generating element mounting surface 242 of the substrate 241, which is advantageous for heat dissipation since the heat sink 230 can rise from the rear frame end 220 at the height of the connector 280, increasing the heat dissipation surface area and the amount of heat dissipated from it. That is, the heat generated by the heat-generating element 70 can be efficiently dissipated by the heat sink 230.

[0164] An opening 281 of the connector 280 faces outwards and can be connected to a cable harness that comes radially from outside the control device 2. Furthermore, the connector 280 has a terminal 282. The terminal 282 is connected to the substrate 241.

[0165] The connector 280 of the present embodiment comprises a power supply connector 283 and a signal connector 284, which are integrally combined to form a single body. The outer circumference of the connector 280 is designed as a flange 285.

[0166] A cover element 290 is constructed of a metallic material and is formed as a separate body from the connector 280. The cover element 290 has an upper part 291 and a side wall 292, which is formed along the circumference of the upper part 291, and covers the ECU 240 and is attached to the rear frame end 220 by crimping or the like.

[0167] The side wall 292 has a recess 293 which is suitably formed to accommodate the connector 280. The side of the opening 281 of the connector 280 is thus free from the cover element 290.

[0168] In the present embodiment, the flange 285 has a motor-side surface that is exposed by the cover element 290, assuming that the motor 10, after installation in the vehicle, is positioned on a vertically lower side in the control device 2. The flange 285 prevents water or similar substances from entering the control device 2 via a connecting element between the cover element 290 and the connector 280. Furthermore, any water that does enter is transported along the flange 285 to the outside of the control device 2.

[0169] In the present embodiment, the first motor lead 135 and the second motor lead 145 are arranged on the same circuit on the substrate 241. Consequently, the connection between the first / second motor lead 135, 145, extending from the first / second winding group 13, 14, and the substrate 241 is easily established. Furthermore, the configuration of the present embodiment achieves the same effects as the embodiment described above. (Third embodiment)

[0170] The third embodiment of the present invention is described with reference to the Fig. 18 described. Fig. Figure 18 shows an illustrative cross-sectional view of a control device 3, from which the connector and the like have been omitted. Furthermore, the hatching of the SW elements has also been omitted. The same applies to the Fig. 19 and Fig. 20.

[0171] An ECU 340 of the control device 3 differs from the embodiment described above. The ECU 340 has a substrate 341, a central element 350, and a heat sink 355, arranged in that order on the side of the motor 10. A heat-generating element mounting surface 342 of the substrate 341, facing the motor 10, has SW elements 51-56 and 61-66 attached to it. The arrangement of the SW elements 51-56 and 61-66 on the surface 342 corresponds to the Fig. 10. That is, as in the embodiments described above, the arrangement of the first motor lead 135 and the SW elements 51-56 and the arrangement of the second motor lead 145 and the SW elements 61-66 are reversed with respect to the phase arrangement from the side of the electrical power supply area Rin. In the present embodiment, the heat-generating element mounting surface 342 corresponds to a single surface. Furthermore, the rear side of the substrate 341, i.e., a surface 343, can likewise be considered a single surface, and the SW elements 51-56, 61-66 can be attached to the surface 343.

[0172] The central element 350 comprises a plate-shaped section 351 and a circumferential wall section 352. The plate-shaped section 351 is essentially in the form of a circular disk, with an electronic component 181 attached to a surface of the central element 350 facing the substrate 341. The circumferential wall section 352 rests on the plate-shaped section 351, extending towards the heat sink 355 and towards the substrate 341, at least over a portion of the circumference of the plate-shaped section 351. The substrate 341 and the central element 350 are electrically connected via a wiring pattern or the like. A hole is drilled essentially in the center of the substrate 341 and the central element 350 to accommodate a shaft 160.

[0173] A bearing 168 is arranged essentially in the center of the heat sink 355 to rotatably support the shaft 160. An electronic component 182 is arranged on a surface of the heat sink 355 facing the motor 10. The electronic component 182 is connected to the central element 350 via a connector or the like (not shown). The electronic components 181 and 182 include, for example, a relay, a capacitor, an inductor, a microcomputer, an ASIC, or the like. The electronic components 181 and 182 can be attached to the substrate 341 or to a surface of the plate-shaped part 351 facing the heat sink 355. In such a configuration, the same effects are achieved as in the embodiments described above. (Fourth and fifth embodiments)

[0174] The fourth embodiment of the present invention, as shown in Fig. Figure 19 shows a control device 4 with an ECU 440 that differs from the third embodiment. In the fourth embodiment, the SW elements 51-56, 61-66 are arranged on a surface of the plate molding 351 that faces the motor 10. In the present embodiment, the plate molding 351 is considered a “substrate”. The SW elements 51-56, 61-66 can also be arranged on the other surface of the plate molding 351 that faces the heat sink 355.

[0175] The fifth embodiment of the present invention, as shown in Fig. Figure 20 shows a control device 5 with an ECU 550 that differs from the third embodiment. In the fifth embodiment, the SW elements 51-56, 61-66 are arranged on a surface of the heat sink 355 facing the motor 10. In the present embodiment, the heat sink 355 is considered a “substrate”.

[0176] The heat sink 355 is not electrically connected to the SW elements 51-56, 61-66 and the motor leads 135, 145. The SW elements 51-56, 61-66 may be electrically connected to the middle element 350 or the substrate 341 via a connection (not shown) or the like.

[0177] Furthermore, even if the SW elements 51-56, 61-66 and the plate form part 351 are in the Fig. 20 are arranged spaced apart over an intermediate space, the SW elements 51-56, 61-66 are electrically connected to the other surface of the plate molding 351, which is facing away from the motor 10, and are arranged to dissipate heat to the heat sink 355.

[0178] The phase sequence arrangement of the SW elements 51-56, 61-66 and the motor leads 135, 145 on the plate component 351 or on the heat sink 355 corresponds to the embodiment described above. Furthermore, if the electrical power supply area Rin is arranged on the substrate 341, a projection area of ​​the electrical power supply area Rin corresponding to a projection along the shaft of the control device 4 or 5 can also be considered the "reference position". The electrical power supply area can also be arranged on the plate component 351.

[0179] In the Fig. 19 and Fig. 20. The motor leads extend to reach the plate molding 351 or the heat sink 355. (i) However, the substrate 341 and (ii) the plate molding 351 or the heat sink 355 can be considered as one “substrate,” and the motor leads 135, 145 can be connected to the substrate 341. That is, the motor leads 135, 145 do not need to extend to reach the plate molding 351 or the heat sink 355. In such a configuration, the same effects are achieved as in the embodiment described above.

[0180] Furthermore, substrate 341 exhibits in the Fig. 19, Fig. 20 and the middle element 350 in the Fig. 20 the electronic component is not on, however the electronic component, such as the capacitor, the coil, the microcomputer, the ASIC and the like, can be attached to the substrate 341 and the central element 350.

[0181] Furthermore, the heat sink 350 on the middle element can be located in the Fig. 18 and Fig. The 19 ordered electronic components may be omitted. (Other embodiments)(a) Frame element

[0182] According to the embodiments described above, the frame element is attached to the motor housing by the frame locking screw. According to further embodiments, the frame element can be attached to the motor housing using a component other than a screw. Furthermore, the frame element can be attached to the motor housing by press-fitting. In this way, the number of components can be reduced. Additionally, the volume along the radius of the control device can be reduced.

[0183] In the third to fifth embodiments, the frame element is not present. In the further embodiments, the control device with the central element can have the frame element arranged therein, as in the third to fifth embodiments. (b) ECU

[0184] According to the embodiments described above, the heat-generating element can contact the frame element via thermal paste. According to further embodiments, the thermal paste can be replaced by a heat-conducting plate, or the heat-generating element can contact the frame element directly.

[0185] According to the embodiments described above, the SW elements have a heat dissipation section that is exposed by the molded part. According to further embodiments, the heat dissipation section does not necessarily have to be exposed by the SW element. The same applies to the power relay, the counter-wired protection relay, and the ASIC.

[0186] According to the embodiments described above, the control element, the current sensing element, the power relay, the counter-connected protection relay and the ASIC correspond to the heat-generating element and these heat-generating elements are arranged to dissipate heat from their rear faces to the frame element.

[0187] According to further embodiments, the current sensing element, the power relay, and the counter-wired protective relay can be attached to or omitted from a surface different from that with the first / second control element. Furthermore, the first / second control element can be attached to a surface of the frame element opposite the rotating electrical machine, i.e., to the electronic component mounting surface.

[0188] Furthermore, the current sensing element can be implemented not as a shunt resistor, but as a Hall-effect IC or similar, and the current sensing element can be designed for only two or fewer phases. That is, the current sensing element can be partially omitted. The power relay can be implemented as a mechanical relay.

[0189] Furthermore, electronic components other than those mentioned above can also be attached to the heat-generating element mounting surface of the substrate as heat-generating elements in order to dissipate heat from their backs to the frame element.

[0190] Furthermore, all or some of the electronic components attached to the heat-generating element mounting surface may be designed not to dissipate heat towards the frame element.

[0191] According to the embodiments described above, of the electronic components forming the control unit, the ASIC is mounted on the heat-generating element mounting surface and the microcomputer is mounted on the electronic component mounting surface. According to further embodiments, any electronic component forming the control unit, i.e., components other than the ASIC and the microcomputer, can be arbitrarily combined to form an assembly or package.

[0192] Furthermore, the ASIC can be mounted on the electronic component mounting surface, and the microcomputer on the heat-generating element mounting surface. That is, the electronic components relating to the control unit can be mounted on either surface, depending on the assembly or package configuration and / or the heat generation situation. Additionally, the microcomputer can be mounted in an area that does not overlap with the ASIC. The heat-generating element mounting surface and the electronic component mounting surface simply indicate that the heat-generating elements or the electronic components can be mounted on these surfaces, but this does not necessarily mean that the heat-generating elements or the electronic components should be mounted on these surfaces.

[0193] According to the embodiments described above, the SW element forming the first inverter part and the SW element forming the second inverter part are arranged axially symmetrically in the first embodiment, and the SW element forming the first inverter part and the SW element forming the second inverter part are arranged point-symmetrically in the second embodiment.

[0194] According to further embodiments, the SW elements in the configuration of the first embodiment can have a point-symmetric arrangement, or the SW elements in the configuration of the second embodiment can have an axis-symmetric arrangement.

[0195] Furthermore, the SW element can be arranged arbitrarily, i.e., the SW element does not have to be arranged symmetrically.

[0196] Furthermore, the electronic components can be arranged differently from the SW element and in any way imaginable.

[0197] According to the embodiments described above, the phase sequence in the first system is U, V, W from the near side of the electrical power supply area, and the phase sequence in the second system is W, V, U from the near side of the electrical power supply area. According to further embodiments, the phase sequence in the first system can be any sequence, i.e., not necessarily U, V, W from the side of the electrical power supply area. More precisely, the first, second, and third phases can each be any of the phases U, V, and W. Furthermore, the phase sequence in the second system can be the reverse of the phase sequence in the first system. In this way, the influence of magnetic leakage flux on the rotary angle sensor, as in the embodiments described above, can be reduced due to the mutual cancellation of the leakage.Furthermore, the variation in wiring impedance between the different phases can be reduced.

[0198] Furthermore, the phase sequences in the first connecting line and the first control element, as well as in the second connecting line and the second control element, may differ from the electrical power supply area with respect to another position.

[0199] According to the embodiments described above, the first and second connecting leads are arranged in a point-symmetrical manner. According to further embodiments, the arrangement of the first and second connecting leads can be different from point symmetry. Furthermore, at least one of the first and second connecting leads can be arranged non-symmetrically, i.e., only one of them can be symmetrical on either side of the arrangement. Additionally, the first connecting lead can be positioned on the substrate at a location different from a position radially outside the first region. Similarly, the second connecting lead can be positioned at a location different from a position radially outside the second region.

[0200] According to the embodiments described above, the elements are arranged radially outward from the side of the central axis in the following order: high-potential elements, low-potential elements, and current-sensing elements. According to further embodiments, the element arrangement can have other sequences different from the one above; that is, the low-potential elements can be arranged first from the side of the central axis, or any other sequence can be provided. Furthermore, the current-sensing elements can be partially omitted; that is, current-sensing elements can be provided for only two of the three phases.

[0201] According to the embodiments described above, the first distance from the center of the electrical power supply area to the center of the first area and the second distance from the center of the electrical power supply area to the center of the second area can be essentially the same. According to further embodiments, the first distance and the second distance need not necessarily be the same. The electrical power supply area can, for example, be defined as an area near a mounting position of the counter-wired protective relay 73 in the Fig.11. In such a case, the "electrical power supply area" can be flexibly defined as an inclusive or total area extending from one side of the inverter to the opposite side, including the power supply wiring pattern, and the phase sequence of the first and second systems with respect to the electrical power supply area described above can be as follows: from the side of the electrical power supply area to the opposite side, in the order of first, second, and third phase in the first system and in the order of third, second, and first phase in the second system. In such a configuration, the variation in impedances across the different phases is also reduced compared to the other phase sequence arrangement.

[0202] According to the first embodiment, the metal piece used for connection to the motor cable is attached to the substrate, with the substrate and the motor cable being joined by press-fitting. Furthermore, in the second embodiment, the substrate and the motor cable are joined by soldering or a similar process.

[0203] According to further embodiments, the substrate and the motor cable can be connected, for example, by soldering in the configuration of the first embodiment, or, for example, by pressing in the metal piece arranged on the substrate in the configuration of the second embodiment. Furthermore, the connection between the substrate and the motor cable can be made by any method other than soldering or pressing.

[0204] According to the embodiments described above, the substrate is attached to the frame element using the substrate securing screw. According to further embodiments, the substrate can be attached to the frame element using any other method besides screwing. (c) Connectors

[0205] According to the first embodiment, the connector comprises one power supply connector and two signal connectors. According to further embodiments, one or both of the power supply connectors and the signal connectors can be provided as two or more than two sets. These connectors can, as in the first embodiment, have separate bodies or, as in the second embodiment, have an integrated body.

[0206] Furthermore, if no motor housing is provided, as shown in the second embodiment, the stator can serve as the “rotating electric machine” and the connector can be positioned within the stator’s projection area in the axial direction. Additionally, assuming that the connector and the cover element are provided as separate bodies, the connector can be attached to the large-component mounting surface of the substrate (i.e., on a side opposite the motor).

[0207] Furthermore, the number of connectors, the orientation of the connector opening, and the arrangement of the cover element, whether or not it is formed as one piece with the connector, can all be combined in any configuration. (d) Cover element

[0208] According to the first embodiment, the cover element is attached to the frame element using adhesive. According to the second embodiment, the cover element is attached to the frame element by crimping. The cover element can also be attached to the frame element by any other method, such as fastening with a screw or the like. (e) Control device

[0209] According to the embodiments described above, the rotating electric machine is a brushless three-phase motor. According to further embodiments, the motor can be of any design, i.e., not necessarily a brushless three-phase motor, but any type of motor with three or more phases.

[0210] Furthermore, the rotating electrical machine can be not only a motor (i.e., an electric motor), but also a generator or a motor-generator with a motor function and a generator function.

[0211] According to the embodiments described above, the output end connected to the transmission is located on the opposite side of the ECU from the motor. More precisely, in the control device described above, the output end, the motor, and the ECU are arranged in this (written) order.

[0212] According to further embodiments, the drive end can be arranged on the same side as the motor. More precisely, in these further embodiments, the drive end, the ECU, and the motor can be arranged in that order.

[0213] According to the embodiments described above, the control device is applied to an electric power steering device. According to further embodiments, the control device can be applied to a device other than the electric power steering device.

[0214] Such changes, modifications and combined schemes shall be understood as being included within the scope of protection of the present invention as set out in the attached claims.

Claims

[1] Control device applied to an electric power steering device to assist a driver's steering operation, comprising: - a rotating electrical machine (10, 210) with a stator (12, 212) with a first winding group (13) and a second winding group (14) which are wound onto the stator in at least three phases, a rotor (15) which is rotatably arranged with respect to the stator, and a shaft (16) which rotates together with the rotor; - a substrate (41, 241, 341, 351, 355) that is arranged at an axial end of the rotating electrical machine; - a first control element (51-56) which (i) is arranged on a surface (42, 242, 342) of the substrate (41) in a first region (R1) and (ii) forms a first inverter (50) which switches a power supply to the first winding group; - a second control element (61-66) which (i) is arranged on the same surface of the substrate as the first control element in a second region (R2) and (ii) forms a second inverter (60) which switches a power supply to the second winding group, wherein the second region (R2) is symmetrical to the first region (R1) with respect to a shaft of the rotating electrical machine; - a first connecting line (135) extending from each of the at least three phases of the first winding group to be connected to the substrate; and - a second connecting line (145) extending from each of the at least three phases of the second winding group to be connected to the substrate, - wherein the first connecting line and the first control element, as well as the second connecting line and the second control element, each have reversed phase sequences in an arrangement of phase sequences from one end near a reference position to another end of the arrangement, such that magnetic leakage flux and variation in wiring impedance among the at least three phases are reduced, - wherein the reference position has an electrical energy supply area (Rin) which is (i) an area outside the first area (R1), the second area (R2) and a control element area (R3) which has a central axis (O) of the rotating electrical machine, and (ii) an area with a circuit pattern which supplies electrical energy from a battery (109) to the first and second inverters. [2] Control device according to claim 1, characterized by , that it further exhibits: - a relay (71, 72) that is switchable to conduct and interrupt an electric current from a power source to the first or second inverter, wherein the relay is arranged in the electrical power supply area (Rin) on the same surface of the substrate as the first and second control elements. [3] Control device according to claim 1 or 2, characterized by , that it further exhibits: - a frame element (20, 220) arranged at a position between the rotating electric machine and the substrate, wherein - the first control element and the second control element are arranged on a surface (42) of the substrate facing the frame element in a heat-dissipating manner to the frame element. [4] Control device according to any one of claims 1 to 3, characterized by , that - the first connecting line is connected to the substrate at a position radially outside the first area; and - the second connecting cable is connected to the substrate at a position radially outside the second area. [5] Control device according to claim 4, characterized by , that it further exhibits: - an electric current sensing element (57-59, 67-69) that senses an electric current supplied to each of the at least three phases of the first and second winding group, wherein the electric current sensing element (i) is located on the same surface (42) of the substrate as the first and second control elements and (ii) is located at a position either between the first control element and the first connecting line or between the second control element and the second connecting line. [6] Control device according to any one of claims 1 to 5, characterized by , that - the first and second control elements are arranged around the shaft of the rotating electrical machine, wherein the first and second control elements each comprise (i) high potential elements (51-53, 61-63) located near the shaft and (ii) low potential elements (54-56, 64-66) located outside the high potential elements with respect to the shaft of the rotating electrical machine. [7] Control device according to any one of claims 1 to 6, characterized by , that - the first and second connecting lines are arranged symmetrically with respect to the shaft of the rotating electrical machine. [8] Control device according to any one of claims 1 to 7, characterized by , that - the first and second connecting lines each have a symmetrical phase arrangement, in which a middle phase has other phases arranged on both sides of the middle phase. [9] Control device (2) according to any one of claims 1 to 8, characterized by , that - the first and second connecting lines are arranged along a circular area on the substrate. [10] Control device according to any one of claims 1 to 8, characterized by , that - the first connecting wire runs linearly through the substrate; and - the second connecting cable runs linearly through the substrate. [11] Electric power steering device comprising: - a control device with: - a rotating electrical machine (10, 210) with a stator (12, 212) with a first winding group (13) and a second winding group (14) which are wound onto the stator in at least three phases, a rotor (15) which is rotatably arranged with respect to the stator, and a shaft (16) which rotates together with the rotor; - a substrate (41, 241, 341, 351, 355) that is arranged at an axial end of the rotating electrical machine; - a first control element (51-56) which (i) is arranged on a surface (42, 242, 342) of the substrate (41) in a first region (R1) and (ii) forms a first inverter (50) which switches a power supply to the first winding group; - a second control element (61-66) which (i) is arranged on the same surface of the substrate as the first control element in a second region (R2) and (ii) forms a second inverter (60) which switches a power supply to the second winding group, wherein the second region (R2) is symmetrical to the first region (R1) with respect to a shaft of the rotating electrical machine; - a first connecting line (135) extending from each of the at least three phases of the first winding group to be connected to the substrate; and - a second connecting line (145) extending from each of the at least three phases of the second winding group to be connected to the substrate, - wherein the first connecting line and the first control element, as well as the second connecting line and the second control element, each have reversed phase sequences in an arrangement of phase sequences from one end near a reference position to another end of the arrangement, such that magnetic leakage flux and variation of wiring impedance among the at least three phases are reduced; - wherein the reference position has an electrical energy supply area (Rin) which is (i) an area outside the first area (R1), the second area (R2) and a control element area (R3) which has a central axis (O) of the rotating electrical machine, and (ii) an area with a circuit pattern which supplies electrical energy from a battery (109) to the first and second inverters; and - a power transmission part (9) that transmits a torque output by the rotating electric machine to a control object (102), wherein - steering operation of a steering wheel (101) by a driver is assisted by the torque from the rotating electric machine, the torque being used to control the controlled object.

Images