Rotary electric machine

Abstract

To provide a rotary electric machine capable of improving the connection quality between a connector connection portion and a connector.SOLUTION: A rotary electric machine (100) includes a motor (10), a control unit (20) for controlling the rotation of the motor (10), a heat sink (30), and a connector (24). The control unit (20) is stacked and fixed on the heat sink (30) in the order of a first circuit board (21), a retaining member (23), and a second circuit board (22). The heat sink (30) has a connector connection port (30M) through which terminals (24P) of the connector (24) are inserted. The retaining member (23) has a recess (23R) opening toward an output side (Z+) such that it covers both the terminal connection portion (21B) of the first circuit board (21) and a protruding portion (21PU) in which the terminals (24P) connected to the terminal connection portion (21B) protrude from the first circuit board (21) toward the reverse output side (Z-).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a rotating electric machine. [Background technology]

[0002] In the past, a rotating electric machine has been proposed in which multiple control boards serving as motor control units are stacked in the axial direction and each is fixed to a heat sink. In such a rotating electric machine, for example, when a first circuit board and a second circuit board are fixed to each heat sink, a fixing boss is provided on the heat sink to fix the upper second circuit board, and a notch must be cut out in the lower first circuit board to avoid interference with this fixing boss, resulting in a problem of a reduced mounting area for electronic components.

[0003] Therefore, a rotating electric machine has been proposed which includes two circuit boards for driving a motor, spacers of a predetermined length interposed between each of the circuit boards, and connectors connected to each of the circuit boards, with these arranged in the order of first circuit board, spacer, second circuit board, and connector facing away from the non-output side, and a common fixing member which fixes these components to each other is inserted from the connector side through the connector, second circuit board, spacer, and first circuit board and fixed to the end wall of the motor housing which functions as a heat sink (see, for example, Patent Document 1).

[0004] In this way, Patent Document 1 eliminates the need for fixing bosses to fix the second circuit board and eliminates the need to cut out the first circuit board, making it possible to expand the mounting area for electronic components mounted on the first circuit board. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-127334 A Summary of the Invention [Problem to be solved by the invention]

[0006] Some connectors use press-fit terminals to connect to circuit boards, which eliminates the need for soldering and reduces manufacturing costs.

[0007] On the other hand, if there is a large misalignment between the connector and the circuit board when assembling the connector, the tip of the press-fit terminal may come into contact with the outer periphery of the through-hole, causing the terminal to buckle or foreign matter to be generated due to damage to the circuit board, and the generated foreign matter may cause a short circuit between electronic components on the circuit board, thereby adversely affecting product quality.

[0008] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a rotating electric machine that can improve the connection quality between a connector connection portion and a connector in a rotating electric machine that has a rotating electric machine control unit having multiple circuit boards arranged in a stacked manner. [Means for solving the problem]

[0009] The rotating electric machine according to the present disclosure includes: A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z-; the first circuit board and the second circuit board are positioned relative to each other by the holding member; The heat sink has a connector connection port through which a terminal of the connector is inserted from the output side Z+ toward the opposite output side Z-, The retaining member has a recess that opens to the output side Z+ so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board toward the anti-output side Z-. The rotating electric machine according to the present disclosure includes: A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z-; the first circuit board and the second circuit board are positioned relative to each other by the holding member; the holding member has a connector connection port through which a terminal of the connector is inserted from the counter-output side Z- to the output side Z+, The heat sink has a recess that opens to the anti-output side Z- so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board to the output side Z+. [Effects of the Invention]

[0010] According to the rotating electric machine of the present disclosure, a rotating electric machine can be provided that can improve the connection quality between the connector connection portion and the connector in a rotating electric machine that has a rotating electric machine control unit having multiple circuit boards arranged in a stacked manner. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an exploded perspective view of a rotating electric machine according to a first embodiment. [Figure 2] 1 is a cross-sectional schematic view of a rotating electric machine according to a first embodiment. [Figure 3]1 is a perspective view of a control unit according to a first embodiment, as viewed from the output side. FIG. [Figure 4] 1 is a perspective view of a connector according to a first embodiment. [Figure 5] FIG. 1 is a perspective view of a heat sink according to a first embodiment. [Figure 6] 3 is a perspective view of the holding member according to the first embodiment as viewed from the output side. FIG. [Figure 7] 3 is a perspective view of the holding member according to the first embodiment, as viewed from the side opposite to the output side. FIG. [Figure 8] 8A to 8F are diagrams showing the assembly procedure of the control unit. [Figure 9] FIG. 10 is a cross-sectional view schematically illustrating a rotating electric machine according to a second embodiment. [Figure 10] FIG. 11 is a perspective view of a connector according to a third embodiment. [Figure 11] FIG. 11 is a perspective view of a control unit according to a third embodiment, as viewed from the output side. [Figure 12] FIG. 11 is a perspective view of a holding member according to a third embodiment, as viewed from the output side. [Figure 13] FIG. 11 is a perspective view of a holding member according to a third embodiment, as viewed from the side opposite to the output side. [Figure 14] FIG. 10 is a cross-sectional view schematically illustrating a rotating electric machine according to a fourth embodiment. [Figure 15] FIG. 10 is a perspective view of a holding member according to a fourth embodiment, as viewed from the opposite output side. [Figure 16] 1 is a cross-sectional schematic view of a rotating electric machine according to a first embodiment. [Figure 17] FIG. 10 is a cross-sectional view schematically illustrating a rotating electric machine according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Embodiment 1 The rotating electric machine according to the first embodiment will be described below with reference to the drawings. In addition, the same reference numerals are used to denote identical or similar components in each drawing. In addition, in order to avoid unnecessary redundancy in the description and to facilitate understanding by those skilled in the art, detailed descriptions of well-known matters and redundant descriptions of substantially identical components may be omitted.

[0013] FIG. 1 is an exploded perspective view of a rotating electrical machine 100 according to a first embodiment. FIG. 2 is a schematic cross-sectional view of the rotating electrical machine 100. As shown in FIG. 16 is a schematic cross-sectional view of the rotating electrical machine 100. This is the same schematic cross-sectional view as FIG. 2 and 16 are examples showing cross sections. 2, i.e., the stacking direction of the heat sink 30, first circuit board 21, holding member 23, and second circuit board 22, is defined as stacking direction Z. Stacking direction Z is the same as the axial direction of rotor shaft 13 of rotating electrical machine 100. 2, that is, the side where an external load is connected to the rotating electrical machine 100, is the output side Z+, and the opposite side of the output side Z+, that is, the upper side of the paper, is the anti-output side Z-. The rotating electric machine 100 includes a polyphase winding motor 10 (hereinafter simply referred to as the motor 10) and a control unit 20 that controls the rotation of the motor 10.

[0014] First, the configuration of the motor 10 will be described. The motor 10 has a stator 11, a rotor 12, and a rotor shaft 13. The stator 11 is fixed to the inner surface of a cylindrical motor case 10K by shrink fitting or press fitting. The rotor shaft 13 is fitted into the center of the rotor 12 in the axial direction of the rotor 12. The rotor 12 is rotatably installed with its outer peripheral surface facing the inner peripheral surface of the stator 11 via an air gap.

[0015] An armature winding 10C is wound around the stator 11. An end of the armature winding 10C is connected by TIG (Tungsten Inert Gas) welding or the like to an annular wiring portion 8 that is disposed in the motor case 10K near and above the armature winding 10C (above in FIG. 2).

[0016] The control unit connecting wiring 9 extends from the annular wiring portion 8 to the anti-output side Z- of the rotating electric machine 100, passing through a heat sink 30 described below. In this way, the control unit connecting wiring 9 is connected to the end of the armature winding 10C via the annular wiring portion 8.

[0017] The control unit connection wiring 9 is composed of three conductors connected to the winding end of the U-phase winding of the armature winding 10C, the winding end of the V-phase winding, and the winding end of the W-phase winding, respectively, and is extended into the control unit 20 and connected by soldering or the like to the first circuit board 21 on the motor 10 side of the stacked circuit boards.

[0018] Multiple pairs of permanent magnets (not shown) that form field poles are arranged on the circumferential surface of rotor 12. In addition, first bearing 14a and second bearing 14b that rotatably support rotor shaft 13 are arranged on both sides of rotor 12 in the axial direction.

[0019] The first bearing 14a is disposed in the center of the heat sink 30. The heat sink 30 is disposed between the motor 10 and the control unit 20 inside the rotating electric machine 100 and is fixed to the motor 10, serving as a lid separating them. Meanwhile, the second bearing 14b is fixed to the center of a lid 15 that closes an opening on the output side Z+ of the motor case 10K of the rotating electric machine 100. A sensor rotor 16 is press-fitted and fixed to the end of the rotor shaft 13 on the counter-output side Z-. The sensor rotor 16 includes one or more pairs of permanent magnets.

[0020] Next, the configuration of the control unit 20 will be described. The control unit 20 is surrounded by a cover 20K, and is arranged such that, from the output side Z+ toward the counter-output side Z-, a first circuit board 21, a holding member 23, and a second circuit board 22 are stacked in this order in the axial direction of the rotor shaft 13. The first circuit board 21 and the second circuit board 22 are positioned relative to each other by the holding member 23 and fixed to the heat sink 30.

[0021] The first circuit board 21 functions as a drive circuit for the motor 10, and the second circuit board 22 functions as a control circuit for the motor 10. Electronic components 21A, such as switching elements, shunt resistors, and smoothing capacitors, are mounted on the first circuit board 21. Electronic components, such as a microcomputer and a drive circuit for the switching elements, are mounted on the second circuit board 22. Heat generated by the switching elements, shunt resistors, and other components mounted on the first circuit board 21 is dissipated to the heat sink 30 via thermal grease 21G applied to the heat sink 30. While FIG. 2 shows an example in which the electronic components 21A requiring heat dissipation are arranged on the output side Z+ surface of the first circuit board 21, the electronic components 21A may also be arranged on the opposite output side Z- surface of the first circuit board 21.

[0022] The first circuit board 21 and the second circuit board 22 are electrically connected to each other by an inter-board connector 25. Although the figure shows an example in which the first circuit board 21 and the second circuit board 22 are connected by the inter-board connector 25, a bent board or a connector in which the terminal tips of the connector are press-fit may also be used.

[0023] 3 is a perspective view of the control unit 20 as seen from the output side Z+. The first circuit board 21 and the second circuit board 22 of the control unit 20 are relatively positioned and held by a holding member 23 sandwiched between the first circuit board 21 and the second circuit board 22.

[0024] A through-hole 21H1 is provided in the first circuit board 21, and the rotor shaft 13 passes through this through-hole 21H1 in the axial direction. A rotation sensor 20S (see FIG. 2) is arranged across an axial gap in a portion of the second circuit board 22 that is coaxial with the sensor rotor 16 attached to the rotor shaft 13. As the rotation sensor 20S, an MR sensor (Magneto Resistive Sensor) or a Hall sensor is used, which detects changes in the magnetic field from the permanent magnet of the sensor rotor 16, which rotates with the rotation of the rotor shaft 13, and converts the changes into an electric signal. Note that the sensor rotor 16 and the rotation sensor 20S have been described as being of a magnetic sensor type, but they may be of a type other than a magnetic sensor, such as a resolver.

[0025] The first circuit board 21 is also provided with a terminal connection portion 21B in which a plurality of through holes 21H2 are arranged, into which press-fit terminals 24P of a connector 24, which will be described later, are press-fitted. The control unit connection wiring 9 is also connected to the first circuit board 21. The second circuit board 22 is provided with a notch 22K in order to prevent interference with a tool when connecting the control unit connection wiring 9 to the first circuit board 21.

[0026] A connector 24 is disposed on the output side Z+ surface of the heat sink 30, penetrating the heat sink 30 in the stacking direction Z to connect the first circuit board 21 to the outside.

[0027] FIG. 4 is a perspective view of the connector 24. As shown in FIG. The connector 24 includes a power terminal 24D for connection to an external power source (battery) and a signal terminal 24S for connection to sensors. The power terminal 24D and the signal terminal 24S are both so-called press-fit terminals 24P. Their tips 24PT on the control unit 20 side are press-fit into through-holes 21H2 provided in the first circuit board 21. Hereinafter, when the power terminals 24D and the signal terminals 24S are not distinguished from each other and are collectively referred to as press-fit terminals 24P, they will be referred to as press-fit terminals 24P. Generally, the power terminals 24D, through which a large current flows, are thicker and require a larger load for press-fitting.

[0028] On a first surface 24F1 of the connector 24 on the Z-side opposite to the output terminal, an outer peripheral wall portion 24W is formed so as to protrude toward the Z-side opposite to the output terminal so as to surround the base portions of all the press-fit terminals 24P.

[0029] FIG. 5 is a perspective view of the heat sink 30. As shown in FIG. The heat sink 30 is formed with connector connection ports 30M into which the outer peripheral surface of the outer peripheral wall portion 24W described above fits when assembling the connector 24, and into which the press-fit terminals 24P are inserted while positioning the connector 24 and the first circuit board 21. As shown in Fig. 2, the surface of the heat sink 30 on the non-output side Z- contacts the first circuit board 21. The surface of the heat sink 30 on the output side Z+ contacts the first surface 24F1 of the connector 24.

[0030] As shown in Figures 2 and 16, after the connector 24 is assembled to the heat sink 30, the fitting length L in the stacking direction Z between the outer wall portion 24W of the connector 24 and the connector connection port 30M (i.e., the length in the stacking direction Z of the outer wall portion 24W) is set to be longer than the length Q from the output side Z+ surface 21D of the first circuit board 21 to the tip 24PT of the press-fit terminal 24P.

[0031] FIG. 6 is a perspective view of the holding member 23 as viewed from the output side Z+. FIG. 7 is a perspective view of the holding member 23 as seen from the opposite output side Z-. The holding member 23 has a pair of holding portions 23A that protrude toward the output side Z+ for holding the first circuit board 21, and a pair of holding portions 23B that protrude toward the counter-output side Z- for holding the second circuit board 22. As shown in FIG. 3 , the tip of each holding portion 23A engages with an engagement notch 21R provided on a side edge of the first circuit board 21. The tip of each holding portion 23B engages with an engagement notch 22R provided on a side edge of the second circuit board 22.

[0032] Furthermore, the holding member 23 has a cylindrical positioning protrusion 23T for positioning the first circuit board 21 and the second circuit board 22 relative to the heat sink 30. The height of the positioning protrusion 23T is set to be higher than the heights of the holding portions 23A and 23B. As shown in FIG. 3 , the positioning protrusion 23T is fitted into a positioning through hole 21H3 provided in the first circuit board 21 and a positioning through hole 22H3 provided in the second circuit board 22. The positioning protrusion 23T is further fitted into a positioning hole 30H3 provided in the heat sink 30.

[0033] The holding member 23 also has a hollow spacer 23S for adjusting the distance between the first circuit board 21 and the second circuit board 22. The first circuit board 21, which is in contact with the output side Z+ of the spacer 23S, and the second circuit board 22, which is in contact with the counter-output side Z-, are provided with a fixing hole 21H4 and a fixing hole 22H4, respectively. A fixing hole 30H4 is also provided in the heat sink 30 on the output side Z+ of the fixing hole 21H4 of the first circuit board 21. From the second circuit board 22 side, a screw N is inserted through the fixing hole 22H4 of the second circuit board 22, the spacer 23S of the holding member 23, and the fixing hole 21H4 of the first circuit board 21 in this order, and then fixed to the fixing hole 30H4 of the heat sink 30, thereby fixing the control unit 20 to the heat sink 30. It is preferable that the head diameter of the screw N and the outer diameter of the spacer 23S are set to be approximately the same.

[0034] Furthermore, holding member 23 has load transmission portions 23C and 23D that come into contact with first circuit board 21 and second circuit board 22 and spread thermal grease 21G applied to heat sink 30. Furthermore, holding portions 23A and 23B, positioning protrusion 23T, spacer 23S, and load transmission portions 23C and 23D of holding member 23 are all connected by beam portion 23H.

[0035] In order to prevent the fixing force for fixing the first circuit board 21 and the second circuit board 22 from changing due to temperature changes, it is desirable to use the same material as the screw N for the female screw (not shown) inserted into the spacer 23S.

[0036] Furthermore, holding member 23 is formed with recess 23R that opens to output side Z+ so as to cover terminal connection portion 21B of first circuit board 21 and protrusion 24PU that includes tip 24PT where press-fit terminal 24P connected to terminal connection portion 21B protrudes from first circuit board 21 to the anti-output side Z-. An edge of recess 23R contacts first circuit board 21 so as to surround the periphery of terminal connection portion 21B of first circuit board 21, and back side 23RB of recess 23R contacts second circuit board 22.

[0037] Next, the assembly procedure for the control unit 20 will be described. 8A to 8F are diagrams showing the assembly procedure of the control unit 20. FIG. As shown in FIG. 8A, the control unit 20 is assembled by holding the first circuit board 21 and the second circuit board 22 by the holding portions 23A and 23B of the holding member 23, and the control unit 20 is positioned on the heat sink 30 as shown in FIGS. 8B and 8C.

[0038] At this time, by applying pressure to the surface of the anti-output side Z- of the second circuit board 22 with a jig or the like, the first circuit board 21 is pressurized by the load transmission parts 23C, 23D of the holding member 23, and the thermal grease 21G applied to the heat sink 30 is spread out.

[0039] 8D, screws N are inserted into spacers 23S from above second circuit board 22 to fix second circuit board 22, holding member 23, and first circuit board 21 to heat sink 30 fixed to motor 10. Next, control unit connection wiring 9 is connected to first circuit board 21.

[0040] Next, as shown in FIG. 8E, the rotating electric machine 100 is turned upside down, and the outer peripheral wall portion 24W of the connector 24 is fitted into the connector connection port 30M of the heat sink 30. After the connector 24 and the first circuit board 21 are positioned, a load is applied to the output side Z+ surface of the connector 24 in the counter-output side Z- direction, and the press-fit terminals 24P are press-fit into the through holes 21H2 of the terminal connection portion 21B in the direction of arrow A. At this time, a receiving jig for receiving the press-fit load is provided on the counter-output side Z- surface of the second circuit board 22. Finally, the rotating electric machine 100 is turned upside down again, and as shown in FIG. 8F, a cover 20K is attached from the counter-output side Z- to complete the rotating electric machine 100.

[0041] The effects obtained by the rotating electrical machine 100 configured as above will be described. Generally, in a rotating electrical machine having a connector with press-fit terminals, if assembly is performed with a large relative positional misalignment between the connector and the circuit board, there is a concern that foreign matter may be generated due to buckling of the terminal or damage to the circuit board, and that the generated foreign matter may cause a short circuit between electronic components on the circuit board, thereby adversely affecting quality.

[0042] On the other hand, according to the rotating electric machine 100 of this embodiment, the control unit 20 is positioned on the heat sink 30 by the screws N, the holding portions 23A, 23B of the holding member 23, and the positioning protrusion portion 23T, so that by fitting the outer wall portion 24W provided on the connector 24 into the connector connection port 30M provided on the heat sink 30, it is possible to accurately position the connector 24 and the first circuit board 21.

[0043] Furthermore, by setting the fitting length L in the stacking direction Z between outer peripheral wall portion 24W and connector connection port 30M to be longer than the length Q from the surface of output side Z+ of first circuit board 21 to tip 24PT of press-fit terminal 24P after assembling connector 24, it becomes possible to assemble connector 24 while restricting the position of connector 24 without tilting. In this case, it is also possible to prevent tip 24PT of press-fit terminal 24P from accidentally contacting a portion other than through-hole 21H2 of terminal connection portion 21B before connector 24 is positioned.

[0044] This allows each press-fit terminal 24P to be reliably press-fit into the corresponding through-hole 21H2, making it possible to prevent buckling of the press-fit terminals 24P or the generation of foreign matter due to damage to the first circuit board 21.

[0045] Furthermore, by forming the outer peripheral wall 24W that fits into the connector connection port 30M into a wall shape that protrudes toward the counter-output side Z- so as to surround the bases of the press-fit terminals 24P, it is possible to increase the length of the press-fit terminals 24P exposed from the first surface 24F1 of the connector 24, and even if the rigidity of the press-fit terminals is reduced, it is possible to absorb misalignment during assembly. This makes it possible to suppress the generation of foreign matter during assembly of the connector 24.

[0046] Furthermore, holding member 23 is formed with recess 23R that opens toward output side Z+ so as to cover terminal connection portion 21B of first circuit board 21 and protrusion 24PU including tip 24PT where press-fit terminal 24P connected to terminal connection portion 21B protrudes from first circuit board 21 in the Z- direction opposite to output side. Therefore, even if foreign matter occurs during press-fit connection of connector 24, it is possible to prevent the foreign matter from leaking out from recess 23R. This makes it possible to prevent short circuits between electronic components arranged on first circuit board 21 and second circuit board 22.

[0047] Furthermore, by configuring the output side Z+ surface and the anti-output side Z- surface of the recess 23R of the holding member 23 to contact the first circuit board 21 and the second circuit board 22, respectively, it becomes possible to provide a receiving jig on the output side Z+ of the second circuit board 22 to receive the press-fit load when the press-fit terminal 24P is pressed into the through hole 21H2, and it becomes possible to assemble the connector 24 while suppressing distortion that occurs in the first circuit board 21 due to the press-fit load.

[0048] In this way, it is possible to provide a rotating electric machine 100 such as a motor or generator having a plurality of circuit boards arranged in a stack, in which the quality of the connector connection portion can be improved.

[0049] Embodiment 2 The rotating electric machine according to the second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. Depending on the application of the rotating electric machine, it may be desirable to place the connector on the Z- opposite output side. This embodiment is a modified example of the first embodiment, and describes a configuration in which a connector connection portion with the same reliability as that of the first embodiment can be obtained even when the connector 24 is placed on the Z- opposite output side.

[0050] FIG. 9 is a schematic cross-sectional view of the rotating electric machine 200. As shown in FIG. 17 is a schematic cross-sectional view of the rotating electric machine 200. It is the same schematic cross-sectional view as FIG. The holding member 223 is formed with a connector connection port 223M that penetrates in the stacking direction Z for fitting with the outer wall portion 24W of the connector 24, and the anti-output side Z- of the connector connection port 223M is configured to contact the first surface 24F1 of the connector 24, and the output side Z+ is configured to contact the first circuit board 21.

[0051] Furthermore, after the connector 24 is assembled, the fitting length L in the stacking direction Z between the outer wall portion 24W and the connector connection port 223M (i.e., the length in the stacking direction Z of the outer wall portion 24W) is set to be longer than the length Q from the surface 21U on the anti-output side Z- of the first circuit board 21 to the tip 24PT of the press-fit terminal 24P.

[0052] The heat sink 230 has a recess 230R that opens to the opposite output side Z- so as to cover a terminal connection portion 21B for the press-fit terminal 24P provided on the first circuit board 21 and a protrusion 24PU that is connected to the first circuit board 21 and includes a tip 24PT of the press-fit terminal 24P that protrudes from the through hole 21H2 of the first circuit board 21 to the output side Z+.

[0053] In addition, in order to prevent interference between the outer wall portion 24W of the connector 24 and the connector connection port 223M of the holding member 223 and the second circuit board 222, when the control unit 220 shown in Figure 9 is viewed from the anti-output side Z-, the length of the long side of the second circuit board 222 (left and right in Figure 9) is set shorter than the length of the long side of the first circuit board 21 (left and right in Figure 9) so that the connector connection port 223M of the holding member 223 is exposed.

[0054] The effects obtained by the rotating electrical machine 200 configured as above will be described. In this embodiment, the outer peripheral wall portion 24W provided on the connector 24 and the connector connection port 223M provided on the holding member 23 allow the connector 24 and the first circuit board 21 to be positioned with high precision.

[0055] Furthermore, by setting the fitting length L in the stacking direction Z between outer peripheral wall portion 24W and connector connection port 223M to be longer than the length Q from the surface of output side Z+ of first circuit board 21 to tip 24PT of press-fit terminal 24P after assembling connector 24, it becomes possible to assemble connector 24 while restricting the position of connector 24 without tilting. In this case, it is also possible to prevent tip 24PT of press-fit terminal 24P from accidentally contacting a portion other than through-hole 21H2 of terminal connection portion 21B before connector 24 is positioned.

[0056] This allows each press-fit terminal 24P to be reliably press-fit into the corresponding through-hole 21H2, making it possible to prevent buckling of the press-fit terminals 24P or the generation of foreign matter due to damage to the first circuit board 21.

[0057] Furthermore, the heat sink 230 is formed with a recess 230R that opens toward the counter-output side Z- so as to cover the terminal connection portion 21B of the first circuit board 21 and the protrusion 24PU including the tip 24PT where the press-fit terminal 24P connected to the terminal connection portion 21B protrudes from the first circuit board 21 in the counter-output side Z- direction. Therefore, even if a foreign object occurs during the press-fit connection of the connector 24, the foreign object can be prevented from leaking out from the recess 230R. This makes it possible to prevent a short circuit between the electronic components arranged on the first circuit board 21 and the second circuit board 22.

[0058] Furthermore, since the heat sink 230 can bear the load during press-fit connection, the connector 24 can be assembled without using a load-bearing jig, and the rotating electric machine 200 can be manufactured with less expensive equipment configuration. As described above, according to the rotating electric machine 200 of the second embodiment, it is possible to arrange the connector on the anti-output side Z- while ensuring the quality of the connector connection portion equivalent to that of the first embodiment.

[0059] Embodiment 3 The rotating electric machine according to the third embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. The third embodiment is a modified example of the first embodiment, and describes a configuration that has the same reliability as the first embodiment in the connector connection even when the terminal connection portions of the press-fit terminal are present in multiple locations on the board.

[0060] FIG. 10 is a perspective view of the connector 324. FIG. 11 is a perspective view of the control unit 320 as seen from the output side Z+. FIG. 12 is a perspective view of the holding member 323 as viewed from the output side Z+. FIG. 13 is a perspective view of the holding member 323 as seen from the opposite output side Z-. In the third embodiment, an example is shown in which terminal connection portion 321B provided on first circuit board 321 as a connection portion for press-fit terminal 24P is configured separately for power terminal 24D and signal terminal 24S. As shown in Fig. 10, outer peripheral wall portion 324W of connector 324 is formed only around the base portion of power terminal 24D, and connector connection port 30M of heat sink 30 that fits into outer peripheral wall portion 324W is also formed only for power terminal 24D. Meanwhile, recesses 323R of holding member 23 are formed for power terminal 24D and signal terminal 24S, respectively.

[0061] The effects obtained by the rotating electrical machine configured as above will be described below. If there are multiple terminal connection portions for press-fit terminals 24P on first circuit board 321, if outer wall portion 324W and the connector connection port 30M that fits into it are formed in multiple locations, there is a concern that the parts may interfere with each other depending on dimensional variations, making it impossible to assemble them.

[0062] On the other hand, if a gap is provided between the outer wall portion 324W and the connector connection port 30M to take into account dimensional variations, the positioning of the connector 324 and the first circuit board 321 may be insufficient, which may result in buckling of the terminals or the generation of foreign matter.

[0063] In this third embodiment, by providing an outer wall portion 324W only around the power terminal 24D, which requires a greater load than the signal terminal 24S when pressing in the press-fit terminal 24P and is therefore more susceptible to foreign matter generation, it is possible to position the power terminal 24D with respect to the first circuit board 321 with higher precision and prevent buckling or the generation of foreign matter.

[0064] Furthermore, by forming recesses 323R in the holding member 323 for the power terminal 24D and the signal terminal 24S, and configuring the edges of the output side Z+ of each recess 323R to contact the first circuit board 21 so as to surround the terminal connection portion 321B of the first circuit board 321, and the back side 323RB of the recess 323R to contact the second circuit board 22, it becomes possible to provide a receiving jig on the non-output side Z- of the second circuit board 22 to receive the press-fit load when the press-fit terminal 24P is pressed into the through hole 21H2.

[0065] This makes it possible to assemble connector 24 while suppressing distortion that occurs in first circuit board 321 due to the press-fit load. Thus, according to the rotating electric machine of embodiment 4, even when the terminal connection portion 321B for the press-fit terminal 24P is present in multiple locations on the first circuit board 321, a rotating electric machine having the same reliability of the connector connection portion as that of embodiment 1 can be provided.

[0066] Embodiment 4 The rotating electric machine according to the fourth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. This embodiment 4 is a modified example of embodiments 1 and 3, and aims to increase the mounting area of ​​electronic components mounted on the second circuit board 22 while improving the connection reliability of the press-fit terminals 24P of the connector 24. FIG. 14 is a schematic cross-sectional view of the rotating electric machine 400. As shown in FIG. 15 is a perspective view of holding member 423 as viewed from the opposite-output side Z-. A protrusion 423T that protrudes in the opposite-output side Z- direction is formed on the opposite-output side Z- of recess 423R of holding member 423. Protrusion 423T is configured so that a tip of protrusion 423T on the opposite-output side Z- comes into contact with second circuit board 22.

[0067] The effects obtained by the rotating electrical machine 400 configured as above will be described. In the fourth embodiment, the space formed around the protrusion 423T provided on the holding member 423 can be effectively utilized to place the electronic component 22B on the second circuit board 22, and therefore, compared to the first embodiment, it is possible to increase the mounting area of ​​the electronic component 22B mounted on the second circuit board 22.

[0068] Furthermore, by configuring the edge of the output side Z+ of the recess 423R of the holding member 423 to contact the first circuit board 21 so as to surround the terminal connection portion 21B of the first circuit board 21, and the tip of the protrusion 423T to contact the second circuit board 22, it becomes possible to provide a receiving jig on the non-output side Z- of the second circuit board 22 to receive the press-fit load when the press-fit terminal 24P is pressed into the through hole 21H2, and it becomes possible to assemble the connector 24 while suppressing distortion that occurs in the first circuit board 21 due to the press-fit load.

[0069] Thus, with the rotating electric machine according to embodiment 4, compared to embodiment 1, it is possible to increase the mounting area of ​​the electronic component 22B mounted on the second circuit board 22 while ensuring the quality of the connector connection portion equivalent to that of embodiment 1.

[0070] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment.

[0071] Various aspects of the present disclosure are summarized below as appendices.

[0072] (Appendix 1) A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z-; the first circuit board and the second circuit board are positioned relative to each other by the holding member; The heat sink has a connector connection port through which a terminal of the connector is inserted from the output side Z+ toward the opposite output side Z-, The retaining member is a rotating electric machine having a recess that opens to the output side Z+ so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board toward the anti-output side Z-. (Appendix 2) an edge of the recess contacts the first circuit board so as to surround the periphery of the terminal connection portion of the first circuit board; 2. The rotating electric machine according to claim 1, wherein a rear side of the recess is in contact with the second circuit board. (Appendix 3) A rotating electric machine as described in Appendix 1 or Appendix 2, wherein an outer wall portion is formed on a first surface of the connector on the opposite side Z- of the output terminal, protruding toward the opposite side Z- so as to surround the base portion of the terminal. (Appendix 4) When the stacking direction of the heat sink and the first circuit board is defined as stacking direction Z, A rotating electric machine as described in Appendix 3, wherein the fitting length in the stacking direction Z between the outer wall portion of the connector and the connector connection port is longer than the length from the surface of the output side Z+ of the first circuit board to the tip of the terminal. (Appendix 5) 5. The rotating electric machine according to claim 3 or 4, wherein the terminal connection portions of the first circuit board are arranged separately for signal terminals as the terminals and for power terminals as the terminals, and the outer wall portion of the connector is formed only around the bases of the power terminals. (Appendix 6) The rotating electric machine according to any one of Supplementary Note 1 to Supplementary Note 5, wherein a protrusion protruding in the Z-direction of the counter-output side is formed on the counter-output side Z- of the recess of the holding member. (Appendix 7) A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z-; the first circuit board and the second circuit board are positioned relative to each other by the holding member; the holding member has a connector connection port through which a terminal of the connector is inserted from the counter-output side Z- to the output side Z+, The heat sink is a rotating electric machine having a recess that opens to the anti-output side Z- so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board to the output side Z+. (Appendix 8) 8. The rotating electric machine according to claim 7, wherein an edge of the recess is in contact with the first circuit board so as to surround the periphery of the terminal connection portion of the first circuit board. (Appendix 9) A rotating electric machine as described in Appendix 7 or Appendix 8, wherein an outer wall portion is formed on a first surface of the output side Z+ of the connector, protruding toward the output side Z+ so as to surround the base portion of the terminal. (Appendix 10) When the stacking direction of the heat sink and the first circuit board is defined as stacking direction Z, A rotating electric machine as described in Appendix 9, wherein the fitting length in the stacking direction Z between the outer wall portion of the connector and the connector connection port is longer than the length from the surface of the anti-output side Z- of the first circuit board to the tip of the terminal. (Appendix 11) 11. The rotating electric machine according to claim 9 or 10, wherein the terminal connection portions of the first circuit board are arranged separately for signal terminals as the terminals and for power terminals as the terminals, and the outer wall portion of the connector is formed only around the bases of the power terminals. [Explanation of symbols]

[0073] 100,200,400 rotating electric machine, 10 polyphase winding motor, 10C armature winding, 10K motor case, 11 stator, 12 rotor, 13 rotor shaft, 14a first bearing, 14b second bearing, 15 lid, 16 sensor rotor, 20,220,320 control unit, 20K cover, 20S rotation sensor, 21,321 first circuit board, 21A, 22B electronic components, 21B terminal connection portion, 21D, 21U surface, 21G thermal grease, 21H1 through hole, 21H2 through hole, 21H3 through hole, 21H4 fixing hole, 21R notch, 22,222 Second circuit board, 22H3 through hole, 22H4 fixing hole, 22K notch, 22R notch, 23,223,323,423 retaining member, 23A, 23B holding part, 23C, 23D load transfer part, 23H beam part, 23R, 323R, 423R, 230R recess, 23RB, 323RB back side, 223M connector connection port, 23S spacer, 23T positioning protrusion, 423T protrusion, 24,324 connector, 24D power terminal, 24S signal terminal, 24P press-fit terminal, 24F1 first surface, 24PT tip, 24PU protrusion, 24W, 324W outer wall, 25 board-to-board connector, 30, 230 heat sink, 30H3 hole, 30H4 fixing hole, 30M connector connection port, 8 ring wiring section, 9 Control unit connection wiring, L mating length, N screw, Z+ output side, Z- opposite output side.

Claims

1. A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z−; the first circuit board and the second circuit board are positioned relative to each other by the holding member; the heat sink has a connector connection port through which a terminal of the connector is inserted from the output side Z+ toward the opposite output side Z−, The retaining member is a rotating electric machine having a recess that opens to the output side Z+ so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board to the anti-output side Z-.

2. an edge of the recess contacts the first circuit board so as to surround the periphery of the terminal connection portion of the first circuit board; The rotating electric machine according to claim 1 , wherein a rear side of the recess contacts the second circuit board.

3. 2. The rotating electric machine according to claim 1, wherein an outer peripheral wall portion is formed on a first surface of the connector on the Z- opposite output side so as to surround base portions of the terminals and protrude toward the Z- opposite output side.

4. When the stacking direction of the heat sink and the first circuit board is defined as stacking direction Z, 4. The rotating electric machine according to claim 3, wherein the fitting length in the stacking direction Z between the outer wall portion of the connector and the connector connection port is longer than the length from the surface of the output side Z+ of the first circuit board to the tip of the terminal.

5. 4. The rotating electric machine according to claim 3, wherein the terminal connection portions of the first circuit board are arranged separately for the signal terminals and the power terminals, and the outer wall portion of the connector is formed only around the bases of the power terminals.

6. 6. The rotating electric machine according to claim 1, wherein a protrusion protruding in the Z-direction of the counter-output side is formed on the counter-output side Z- of the recess of the holding member.

7. A rotating electric machine comprising: a motor; a control unit that controls rotation of the motor; a heat sink that is disposed between the motor and the control unit and fixed to the motor; and a connector that is connected to the control unit, When the side of the motor to which an external load is connected is defined as output side Z+, and the side opposite to output side Z+ is defined as anti-output side Z-, the control unit is fixed on the heat sink by stacking a first circuit board, a holding member, and a second circuit board connected to the first circuit board in this order from the output side Z+ toward the opposite output side Z−; the first circuit board and the second circuit board are positioned relative to each other by the holding member; the holding member has a connector connection port through which a terminal of the connector is inserted from the counter-output side Z- to the output side Z+, The heat sink is a rotating electric machine having a recess that opens to the anti-output side Z- so as to cover the terminal connection portion of the first circuit board and the protrusion of the terminal connected to the terminal connection portion that protrudes from the first circuit board to the output side Z+.

8. The rotating electric machine according to claim 7 , wherein an edge of the recess is in contact with the first circuit board so as to surround the periphery of the terminal connection portion of the first circuit board.

9. 8. The rotating electric machine according to claim 7, wherein an outer peripheral wall portion is formed on a first surface of the output side Z+ of the connector, the outer peripheral wall portion projecting toward the output side Z+ so as to surround a base portion of the terminal.

10. When the stacking direction of the heat sink and the first circuit board is defined as stacking direction Z, 10. The rotating electric machine according to claim 9, wherein the fitting length in the stacking direction Z between the outer wall portion of the connector and the connector connection port is longer than the length from the surface of the opposite output side Z- of the first circuit board to the tip of the terminal.

11. 11. The rotating electric machine according to claim 9 or 10, wherein the terminal connection portions of the first circuit board are arranged separately for the signal terminals as the terminals and for the power terminals as the terminals, and the outer wall portion of the connector is formed only around the bases of the power terminals.

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