JP2022138206A - Rotary electric machine - Google Patents

Abstract

To provide an inexpensive and small rotary electric machine while precision of current detection is improved.SOLUTION: A rotary electric machine includes: a rotary electric machine body part in which a rotation shaft, a rotor, a stator having a stator core to which stator winding is wound, and a bracket holding the rotation shaft are provided; and a power supply unit in which a power module having a power semiconductor element, a cooler, a current sensor 172, a control circuit, and a case which has a tabular bottom wall 102a and stores the power module, the control circuit and the current sensor are provided. The power module has a bus bar projecting from the body part along a face of the other side in an axial direction of the bottom wall. A magnetic shield 171 which surrounds the bus bar except for a face on the other side in the axial direction of the bus bar and has a cross section opened to the other side in the axial direction is fixed to the bottom wall. The current sensor is arranged by facing the face of the other side in the axial direction of the bus bar in an arranging position of the magnetic shield, and the current sensor is disposed inside an opening 171a in the magnetic shield.SELECTED DRAWING: Figure 5

Description

The present application relates to a rotating electric machine.

A rotating electrical machine includes a rotating electrical machine body composed of a rotor and a stator, and a power supply unit composed of an inverter and a control circuit for supplying power to the rotating electrical machine body. In particular, in-vehicle rotating electrical machines are required to be space-saving and easy to mount, and to reduce the size of wiring harnesses that connect the main body of the rotating electrical machine and the inverter. For this reason, an electromechanically integrated rotating electric machine in which a rotating electric machine main body and a power supply unit are integrated has been developed.

In the electromechanical integrated rotating electrical machine, the power supply unit is attached to the axial end of the rotating electrical machine main body. Fins are formed on the heat sink of the inverter, and cooling air generated by a blower fan attached to the end of the rotor passes through the fins to cool the power supply unit. The power supply unit is configured by a single-phase or multi-phase arm portion. The arm portion includes power semiconductor elements such as a plurality of MOSFETs. The output terminal of the power semiconductor element is connected to the stator winding of the rotating electrical machine through the output conductor, and supplies electric power to the main body of the rotating electrical machine. In order to detect the current flowing through the output conductor, the rotating electric machine is provided with a current detection section on the output conductor (see, for example, Patent Literature 1). The power semiconductor device is controlled using the detected current value.

In the disclosed rotary electric machine, a current detection device is proposed that includes an annular magnetic circuit surrounding an output conductor and a magnetic detection element arranged in a cutout portion of the magnetic circuit. The current detection device is arranged between the main body of the rotary electric machine and the power supply unit, and the magnetic detection element is connected to the control circuit. A power module having a power semiconductor element is arranged between the control circuit and the main body of the rotating electric machine.

JP-A-2006-174678

In Patent Document 1, since the output conductor is provided with the current detection device, the current flowing through the output terminal of the power semiconductor element can be detected. However, since the magnetic circuit and the magnetic detection element are assembled to the rotary electric machine as separate parts, the positional accuracy of the magnetic circuit and the magnetic detection element deteriorates, resulting in a problem of deterioration in the accuracy of current detection. In addition, the wiring from the control circuit to the magnetic detection element becomes long, and the wiring needs to be protected to ensure vibration resistance and water resistance. I had a problem getting up. In particular, when a rotating electric machine is mounted in an engine room of an automobile, it is required to be able to be installed in a limited space, so it is necessary to suppress an increase in the size of the rotating electric machine. In addition, since the current detection device cannot be inspected until the magnetic circuit and the current detection element are assembled to the rotating electrical machine, defective products will be found in the inspection after assembly. There was a problem that the cost of

SUMMARY OF THE INVENTION Accordingly, an object of the present application is to obtain an inexpensive and compact rotating electric machine while improving the accuracy of current detection.

A rotating electric machine disclosed in the present application includes a rotating shaft, a rotor that rotates integrally with the rotating shaft, and a stator that is disposed radially outside the rotor and has a stator core wound with stator windings. , a bracket that covers the outside of the rotor and stator and holds one end side and the other end side of the rotating shaft via bearings; A power module having a power semiconductor device, a cooler that cools the power module, a current sensor that detects current flowing through the power module, a control circuit that controls the power module, and the power module, the control circuit, and the current sensor. a case that covers one side in the axial direction and has a plate-like bottom wall that extends in the radial direction and the circumferential direction and houses the power module, the control circuit, and the current sensor; and a power supply unit disposed on the side of the power module, the power module having a bus bar protruding from the main body along the other side surface of the bottom wall in the axial direction, A U-shaped or C-shaped magnetic shield whose cross section is open to the other side in the axial direction and surrounds the bus bar except for the other side surface is fixed, and the current sensor is located at the other side of the bus bar in the axial direction at the arrangement position of the magnetic shield. The current sensor is placed inside a U-shaped or C-shaped opening in the magnetic shield.

According to the rotating electric machine disclosed in the present application, the power module provided in the power supply unit has a bus bar protruding from the main body along the other axial surface of the bottom wall of the case. , a U-shaped or C-shaped magnetic shield whose cross section is open to the other side in the axial direction and surrounds the bus bar except for the other side in the axial direction, is fixed, and the current sensor is positioned at the position where the magnetic shield is arranged, The current sensor is arranged to face the other side of the busbar in the axial direction, and the current sensor is arranged inside the U-shaped or C-shaped opening in the magnetic shield. On the other hand, the bus bar, which is the current measurement part, and the current sensor are arranged, and the positional accuracy of the arrangement of the parts can be improved compared to the case where each part is arranged separately, so the current detection accuracy of the current sensor can be improved. can be improved. In addition, since the control circuit and the current sensor are housed inside the case of the power supply unit, the wiring length from the control circuit to the current sensor can be shortened, so that an inexpensive and compact electric rotating machine can be obtained. In addition, since the operation test of the current sensor can be performed only with the power supply unit, defective products can be found before the rotating electric machine is assembled, so that the yield reduction can be suppressed and an inexpensive rotating electric machine can be obtained. can be done.

1 is a perspective view showing an outline of a rotating electric machine according to Embodiment 1; FIG. 1 is a cross-sectional view showing an outline of a rotating electric machine according to Embodiment 1; FIG. 3 is a plan view showing the other side in the axial direction of the power supply unit of the rotary electric machine according to Embodiment 1. FIG. FIG. 2 is a plan view showing a main part of the power supply unit of the rotary electric machine according to Embodiment 1; FIG. 5 is a cross-sectional view of the main part of the power supply unit taken along line AA in FIG. 4; FIG. 5 is a cross-sectional view of the main part of the power supply unit taken along the line BB in FIG. 4; 1 is a diagram showing an outline of a circuit configuration of a rotating electric machine according to Embodiment 1; FIG. FIG. 4 is a diagram showing an assembly process of the rotary electric machine according to Embodiment 1; FIG. 4 is a diagram showing an assembly process of the rotary electric machine according to Embodiment 1; FIG. 4 is a diagram showing an assembly process of the rotary electric machine according to Embodiment 1; FIG. 4 is a diagram showing an assembly process of the rotary electric machine according to Embodiment 1; FIG. 4 is a diagram showing an assembly process of the rotary electric machine according to Embodiment 1; FIG. 10 is a cross-sectional view showing a main part of a power supply unit for a rotating electrical machine according to Embodiment 2; FIG. 11 is a plan view showing a main part of a power supply unit for a rotating electric machine according to Embodiment 2; FIG. 10 is a cross-sectional view showing a main part of a power supply unit of another rotating electric machine according to Embodiment 2; FIG. 10 is a cross-sectional view showing a main part of a power supply unit of another rotating electric machine according to Embodiment 2; FIG. 11 is a cross-sectional view showing a main part of a power supply unit for a rotating electric machine according to Embodiment 3; FIG. 11 is a plan view showing a main part of a power supply unit for a rotating electric machine according to Embodiment 3; FIG. 11 is a cross-sectional view showing a main part of a power supply unit for another rotating electric machine according to Embodiment 3; FIG. 11 is a plan view showing a main part of a power supply unit of another rotating electric machine according to Embodiment 3; FIG. 11 is a cross-sectional view showing a main part of a power supply unit for a rotating electric machine according to Embodiment 4; FIG. 11 is a plan view showing a main part of a power supply unit for a rotating electric machine according to Embodiment 4;

A rotating electric machine according to an embodiment of the present application will be described below with reference to the drawings. In each figure, the same or corresponding members and parts are denoted by the same reference numerals. It should be noted that the size and scale of each corresponding component are independent of each other in the illustrations between the figures.

Embodiment 1.
1 is a perspective view schematically showing a rotating electric machine 100 according to Embodiment 1, and FIG. 2 is a cross-sectional view schematically showing the rotating electric machine 100, cut along a plane passing through an axis C of a rotating shaft 4 and a heat sink 110. FIG. 3 is a plan view showing the other side of the power supply unit 300 of the rotary electric machine 100 in the axial direction, with the cover 101 and the control circuit 103 removed, and FIG. FIG. 5 is a plan view showing a portion where a current sensor 172 is installed, which is a view of the portion surrounded by a circle in FIG. 3, and FIG. 6 is a cross-sectional view of the main part of the power supply unit 300 taken along the line BB in FIG. 4; FIG. 7 is a schematic diagram of the circuit configuration of the rotating electric machine 100; FIG. 3 is a diagram showing the assembly process of the electric machine 100, and is a diagram of assembling the power supply unit 300 to the rotary electric machine main body 200. FIG. The rotating electrical machine 100 is an integrated mechanical and electrical rotating electrical machine that includes a rotating electrical machine main body 200 that is a main body of the rotating electrical machine, and a power supply unit 300 that supplies electric power to the rotating electrical machine main body 200 . Rotating electric machine 100 operates as an electric motor that drives an engine (not shown) that is a load. Alternatively, rotating electric machine 100 functions as a generator that is driven by an engine to generate electricity.

In the present application, a direction parallel to the axis C of the rotating shaft 4 is defined as an axial direction Z, one axial side Z1 is referred to as a front side Z1, and an axial direction opposite to the one axial side Z1 is defined. The other side Z2 is called a rear side Z2.

<Rotating electric machine body 200>
As shown in FIG. 2 , the rotary electric machine main body 200 is arranged on the rotating shaft 4 , the rotor 5 that rotates integrally with the rotating shaft 4 , and the rotor 5 radially outwardly, and the stator windings 3 b are wound thereon. and a bracket that covers the outside of the rotor 5 and the stator 3 and holds one end side and the other end side of the rotating shaft 4 via bearings 71 and 72. ing.

In this embodiment, the bracket is composed of a front bracket 1 arranged on the front side Z1 and a rear bracket 2 arranged on the rear side Z2. The front bracket 1 has a cylindrical outer wall and a disc-shaped side wall extending radially inward from the end of the outer wall on the front side Z1. The rotating shaft 4 passes through the center of the side wall of the front bracket 1, and the side wall has a through hole to which the bearing 71 is fixed. The rear bracket 2 has a cylindrical outer wall and a disc-shaped side wall extending radially inward from the rear-side Z2 end of the outer wall. The rotary shaft 4 passes through the center of the side wall of the rear bracket 2, and the side wall has a through hole to which the bearing 72 is fixed. The front bracket 1 and the rear bracket 2 are connected by bolts 15 extending in the axial direction Z, as shown in FIG.

The end of the rotary shaft 4 on the front side Z1 passes through the through hole of the front bracket 1 and protrudes from the front bracket 1 toward the front side Z1. A pulley 9 is fixed to this projecting portion. A belt (not shown) is stretched between a pulley (not shown) fixed to the crankshaft of the engine and the pulley 9 to transmit rotational driving force between the rotating electric machine 100 and the engine. .

The rotor 5 includes a field core 5a and field windings 5b. The rotor 5 is of the Lundell type (also called claw pole type). The field core 5a has a cylindrical central portion, front-side hook portions extending from an end portion on the front side Z1 of the central portion to a radially outer side Y2 of the central portion, and an end portion on the rear side Z2 of the central portion. a rear-side claw portion extending to the radially outer side Y2 of the central portion. The insulated copper wire of the field winding 5b is concentrically wound around the outer peripheral surface of the central portion of the field core 5a. The claws on the front side and the claws on the rear side are provided alternately in the circumferential direction and have magnetic poles different from each other. The field winding 5b is connected to a slip ring (not shown) provided on the rear side Z2 of the rotary shaft 4, and is supplied from a brush holder (not shown) that holds a brush provided in the power supply unit 300. Supplied with field current.

The stator 3 is arranged so as to surround the rotor 5 with a minute gap. The stator 3 includes a cylindrical stator core 3a provided with slots, and multi-phase stator windings 3b wound in the slots of the stator core 3a. The multi-phase stator windings 3b are, for example, one set of three-phase windings, two sets of three-phase windings, or one set of five-phase windings, which are set according to the type of the rotating electric machine 100. be.

The multi-phase stator winding 3b has front-side coil end portions projecting from the stator core 3a toward the front side Z1, and rear-side coil end portions projecting from the stator core 3a toward the rear side Z2. The lead wires of the multi-phase stator windings 3b pass through the rear bracket 2 and have stator winding terminals 3c extending to the rear side Z2. The stator winding terminal 3 c is connected to the power supply unit 300 via the winding wiring member 113 and the winding wiring member 156 .

<Power supply unit 300>
Power supply unit 300 is arranged on rear side Z<b>2 of the bracket of rotary electric machine main body 200 and fixed to rotary electric machine main body 200 . Rotating electric machine body 200 and power supply unit 300 are integrated. The power supply unit 300 includes a power module 160, an inverter that performs DC-to-AC conversion between a DC power supply and multi-phase windings, a current sensor 172 that detects current flowing through the power module 160, and the power module 160. and a case 102 that houses the power module 160 , the control circuit 103 , and the current sensor 172 .

In this embodiment, the inverter includes a power module 160 and a heat sink 110 to which the power module 160 is fixed and which is a cooler that cools the power module 160 . The heat sink 110 has fins 111 on the front side Z1. The power module 160 includes a power semiconductor element (not shown) that turns on and off the current supplied to the stator winding 3b. The case 102 covers the power module 160, the control circuit 103, and the front side Z1 of the current sensor 172, and has a plate-like bottom wall 102a extending in the radial direction and the circumferential direction. The case 102 has a peripheral wall 102 b covering the power module 160 , the control circuit 103 and the current sensor 172 radially outward. A heat sink fixing surface 167 of the power module 160 is thermally connected to the heat sink 110 at the opening of the bottom wall 102a. The case 102 is made of resin, for example.

A sealing resin 105 for sealing the power module 160 , the control circuit 103 , and the current sensor 172 is provided inside the case 102 . The sealing resin 105 is a potting material such as epoxy or silicone. By sealing the inside of the power supply unit 300 with the sealing resin 105, the moisture resistance, water resistance, insulation, and vibration resistance of the internal components can be enhanced. In the present embodiment, as in Patent Document 1, in the resin sealing process after the process of connecting the control circuit 103 and the power module 160, in addition to the electric power supply unit 300, the rotary electric machine main body 200 having a large heat capacity is introduced at the same time. Since it is not necessary, it does not take time for the temperature to rise, the sealing process takes a long time, the productivity deteriorates, and the cost of the rotating electric machine 100 does not increase. The inside of the power supply unit 300 is not limited to the structure sealed with the sealing resin 105, but the internal parts are fixed by screwing or heat caulking, and the internal parts are covered with a coating material having insulation and moisture resistance. Insulation may be secured.

The power supply unit 300 has a cover 101 . The cover 101 covers the rear side Z2 and the radially outer side of the control circuit 103, the power module 160, the heat sink 110, and the like. The cover 101 is formed in a bottomed cylindrical shape that opens on the front side Z1. The cover 101 is made of resin, for example. A positive power supply terminal, a negative power supply terminal, and a control connector (none of which are shown) are provided on the outer peripheral wall 101b of the cover 101 that covers the radially outer side. A positive power supply terminal and a negative power supply terminal are terminals for connecting the inverter to an external DC power supply. The control connector is a connector for connecting the control circuit 103 to an external control device.

The control circuit 103 has a plate-shaped circuit board 103a. In this embodiment, the circuit board 103a has a disc shape extending in the radial direction and the circumferential direction. The circuit board 103a is configured by a printed board, a ceramic board, a metal board, or the like. The circuit board 103a has electronic components mounted on the circuit board 103a. In particular, since a rotating electrical machine mounted on a vehicle requires high vibration durability, the control circuit 103 is fixed to the case 102 by screws, heat caulking, riveting, adhesion, or the like. The circuit board 103a does not have to be disc-shaped, and the control circuit 103 may be composed of two or more circuit boards 103a as long as the circuit board 103a falls within the range overlapping the rear bracket 2 when viewed in the axial direction Z. , the circuit boards 103a may be made of different materials.

The control circuit 103 is arranged on the rear side Z2 of the rear bracket 2 with a space therebetween. In this embodiment, the surface of the circuit board 103a is perpendicular to the axial direction Z. As shown in FIG. In addition, the surface of the circuit board 103a may be inclined at an angle of 30 degrees or less with respect to a plane orthogonal to the axial direction Z, for example. A bottom wall 102 a of the case 102 covers the front side Z 1 of the control circuit 103 . Further, the case 102 has a peripheral wall 102b that covers the outer peripheral side of the control circuit 103. As shown in FIG. The rear side Z2 of the control circuit 103 is covered with the bottom wall 101a of the cover 101. As shown in FIG.

The rotary shaft 4 extends from the rear bracket 2 to the front of the control circuit 103 (case 102 in this example) on the rear side Z2. The rotary shaft 4 does not pass through the control circuit 103 and the case 102, but is arranged on the front side Z1 of the control circuit 103 and the case 102 with a gap therebetween. A through hole through which the rotating shaft 4 passes may be provided in the control circuit 103 as long as the electronic component can be arranged within a range overlapping the rear bracket 2 when viewed in the axial direction Z.

<Power module 160>
The power module 160 includes a power semiconductor element, a lead portion to which the power semiconductor element is joined, a connection member that is a portion connected to the outside, and an insulating resin material 165 that seals these. The connection member is provided with a portion connected to the outside exposed from the main body of the power module 160 . The power module 160 includes, for one phase winding, a positive-side power semiconductor element connected to the positive side of the DC power supply and a negative-side power semiconductor element connected to the negative side of the DC power supply. are connected in series with at least one set of series circuits. A connection point where the positive electrode side power semiconductor element and the negative electrode side power semiconductor element are connected in series is connected to the winding of the corresponding phase. For example, if a set of three phase windings is provided, three sets of series circuits are provided. As shown in FIG. 7, when two sets of three-phase windings are provided, six sets of series circuits are provided.

Switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and power MOSFETs (Power Metal Oxide Semiconductor Field Effect Transistors) are used as power semiconductor elements. These are used in inverters that drive devices such as motors, and control rated currents of several amperes to several hundred amperes. Silicon (Si), silicon carbide (SiC), gallium nitride (GaN), or the like may be used as the material of the power semiconductor device.

The power module 160 has a winding connecting member 163 which is a connecting member and a bus bar protruding from the main body along the surface of the rear side Z2 of the bottom wall 102a. The power module 160 includes, as connection members, a positive electrode side connection member 161 , a negative electrode side connection member 162 , and a control connection member 164 in addition to the winding connection member 163 . The positive electrode side connection member 161, the negative electrode side connection member 162, the winding connection member 163, and the control connection member 164 are made of, for example, a metal such as copper or a copper alloy having good electrical conductivity and high thermal conductivity. These surfaces may be plated with metal materials such as Au, Ni, and Sn. In addition, two or more kinds of metals and plating materials of these connection members may be used.

In this embodiment, one power module 160 includes two sets of a positive electrode side power semiconductor element and a negative electrode side power semiconductor element, and two series circuits are provided. The connection of the connection members inside the power module 160 will be described. The positive electrode side connecting member 161 is connected to the collector terminal of the power semiconductor element on the positive electrode side. The negative side connecting member 162 is connected to the emitter terminal of the power semiconductor element on the negative side. The winding connection member 163 is connected to a connection point between the emitter terminal of the power semiconductor element on the positive side and the collector terminal of the power semiconductor element on the negative side. The control connection member 164 is connected to the gate terminals of the power semiconductor elements on the positive electrode side and the negative electrode side.

The connection of the connection member outside the power module 160 will be described. The positive electrode side connecting member 161 is connected to the positive electrode side wiring member 154 , and the positive electrode side wiring member 154 is connected to the positive electrode side power supply terminal 151 . The negative connection member 162 is connected to a negative wiring member (not shown), and the negative wiring member is connected to a negative power supply terminal (not shown). The winding connection members 163 are connected to the winding-side wiring members 156, which are connection bus bars, and the winding-side wiring members 156 are connected to the winding wiring members 113 and connected to the stator winding 3b of the corresponding phase. The control connection member 164 is connected to the control circuit 103 . A connector, soldering, conductive adhesive, or the like is used between the control connection member 164 and the control circuit 103 to electrically connect the two. The positive side wiring member 154 , the negative side wiring member, and the winding side wiring member 156 are fixed to the case 102 and are electrically insulated from the heat sink 110 . One power module 160 may be provided with one power semiconductor element, or may be provided with three or more power semiconductor elements. The configuration of the connection members and the like is changed according to the number of power semiconductor elements.

A power semiconductor element is bonded to a wiring pattern, bus bar, or the like of a metal substrate or a ceramic substrate with a conductive material such as solder or silver paste. The metal substrate is composed of a base material such as aluminum or copper. The ceramic substrate is composed of alumina, aluminum nitride, silicon nitride, or the like. The busbar is made of iron, aluminum, copper, or the like. A wiring pattern and a bus bar are collectively referred to as a lead portion.

The power module 160 has a heat sink fixing surface 167 fixed to the heat sink 110 . In this embodiment, the power semiconductor element is fixed to one surface of the lead portion. The other surface of the lead portion constitutes a heat sink fixing surface 167 . The heat sink fixing surface 167 may be provided on the same side as the surface of the lead portion to which the power semiconductor element is fixed. In this embodiment, a heat transfer material is interposed between the heat sink fixing surface 167 and the heat sink 110 in order to reduce contact heat resistance. As the heat transfer material, for example, an insulating material such as grease, an adhesive, a sheet, or a gel, or a conductive member such as solder or silver paste is used. In the case of the lead portion that needs to be insulated from the heat sink 110, a material having insulating properties is used as the heat transfer material. Since the power module 160 and the heat sink 110 are thermally connected via the heat transfer material, it is possible to reduce the thermal resistance between the power module 160 and the heat sink 110 by reducing the number of constituent members and bonding processes.

When the lead portion and the heat sink 110 are at the same potential, the lead portion and the heat sink 110 may be connected by a conductive member such as solder, or the lead portion joined to the power semiconductor element may be connected to the heat sink 110 by a spring, a screw, or the like. may be pressed mechanically. By changing from bonding to mechanical pressing, it is possible to reduce thermal resistance, reduce deterioration due to temperature cycles and high temperatures, and improve long-term reliability. Also, the heat sink 110 may be modularized integrally with one or a plurality of power modules 160 .

The insulating resin material 165 includes, for example, epoxy resin, silicone resin, potting resin such as urethane resin, coating material for the surface of power semiconductor elements such as fluorine resin, polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), poly Molding materials such as ether ether ketone (PEEK) and acrylonitrile butadiene styrene (ABS) are used. By covering the components such as the power semiconductor element with the insulating resin material 165, for example, even if the power supply unit 300 is contaminated with a foreign object, or if the power supply unit 300 is exposed to liquid containing salt, mud, etc., the power supply can be maintained. Insulation inside the module 160 can be ensured. In addition, by using a material having high hardness such as epoxy resin as the insulating resin material 165, the components are fixed inside the power module 160, so that the vibration resistance of the power module 160 can be improved. If the power module 160 can be insulated and fixed by a method that does not use the insulating resin material 165, the insulating resin material 165 may be omitted.

<Winding connection member 163 and its wiring configuration>
In the present embodiment, the main body of power module 160 is formed in a rectangular plate shape, and one winding connection member 163 protrudes from each of both ends in the longitudinal direction on one side surface of the main body. . A plurality of control connection members 164 are arranged between the two winding connection members 163 . The winding connection member 163 is a member that forms part of the current detection section 170 . By arranging in this way, the current detection section 170 can be easily arranged at a position away from the control connection member 164 so that the current detection section 170 does not interfere with the control connection member 164 . If the winding connection member 163 is not located at both ends of one side surface of the power module 160, there should be 4 windings between the control connection member 164 of the power module 160 and the two current detectors 170 to avoid their interference. space is required. If the current detectors 170 are arranged at both ends, there are two spaces for avoiding interference, so the power module 160 can be prevented from becoming larger. Since an increase in size of power module 160 is suppressed, rotating electric machine 100 can be downsized.

The winding-side wiring member 156 and the winding wiring member 113 included in the rotary electric machine 100 will be described. The two winding wiring members 113 are connected to the stator winding terminals 3c of the stator winding 3b and extend to the rear side Z2. The two winding-side wiring members 156 connect each of the two winding wiring members 113 and each of the two winding connection members 163 . The two winding connection members 163 are spaced apart in the circumferential direction and extend toward the peripheral wall 102b. The two winding wiring members 113 are arranged circumferentially adjacent to each other on the radially outer side of the peripheral wall 102b at a position in the circumferential direction between the two winding connecting members 163 . The first winding-side wiring member 156a extends in the circumferential direction and penetrates the circumferential wall 102b, and connects with the radially outer end of the winding connection member 163 on one side in the circumferential direction. It connects with the winding wiring member 113 . The second winding-side wiring member 156b extends in the circumferential direction and penetrates the circumferential wall 102b, and connects with the radially outer end of the winding connection member 163 on the other side in the circumferential direction. It connects with the winding wiring member 113 . Thus, the winding-side wiring member 156 and the winding wiring member 113 electrically connect the power supply unit 300 and the rotary electric machine body 200 .

The winding wiring member 113 is fixed to the winding wiring member fixing portion 114 . The winding wiring member fixing portion 114 is made of a resin material such as polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), and etheretherketone (PEEK), for example. The winding wiring member fixing portion 114 electrically and thermally insulates the winding wiring member 113 from the rear bracket 2 and the heat sink 110 and fixes the winding wiring member 113 to the rear bracket 2 .

By arranging the winding wiring member 156 and the winding wiring member 113 in this way, the space adjacent to the two winding connecting members 163 and the control connecting member 164 can be used to connect the winding wiring member 156 and the winding wiring member 113 to each other. Since the winding wiring member 113 can be connected, an increase in the size of the rotating electrical machine 100 can be suppressed, and the rotating electrical machine 100 can be made smaller.

<Arrangement Configuration of Current Detector 170 and Winding Connection Member 163>
The arrangement and configuration of the current detection section 170, which is the main part of the present application, will be described with reference to FIGS. 4 to 6. FIG. The current detection section 170 in this embodiment is composed of a current sensor 172 , a winding connection member 163 and a magnetic shield 171 . In order to clarify the positional relationship, the control connection member 164 is indicated by a dashed line in FIG.

The magnetic shield 171 surrounds the winding connection member 163 except for the surface on the rear side Z2 of the winding connection member 163, and has a U-shaped or C-shaped cross section that opens toward the rear side Z2. A magnetic shield 171 is fixed to the bottom wall 102a. In this embodiment, as shown in FIG. 5, the front side Z1 portion of the magnetic shield 171 is embedded in the bottom wall 102a, and the magnetic shield 171 is molded integrally with the case 102. As shown in FIG. When the magnetic shield 171 is formed integrally with the case 102, the positional accuracy of the magnetic shield 171 can be particularly enhanced. The configuration in which the magnetic shield 171 is embedded in the bottom wall 102a is not limited to integral molding, and may be embedded by fitting. The fixing of the magnetic shield 171 is not limited to this, and may be fixed by adhering to the rear side Z2 surface of the bottom wall 102a. The magnetic shield 171 is made of a magnetic material such as an electromagnetic steel plate, iron, or nickel. The magnetic shield 171 suppresses penetration of the magnetic field generated in the stator 3 and the rotor 5 to the current sensor 172 . The magnetic shield 171 also has the effect of concentrating the magnetic field generated in the winding connecting member 163 to the current sensor 172 . Magnetic shield 171 is electrically insulated from heat sink 110 and winding connection member 163 . Also, the magnetic shield 171 is arranged at a position away from the main body of the power module 160 and the control connection member 164 so as not to interfere with the control connection member 164 .

Current sensor 172 detects a magnetic field caused by the current flowing through winding connection member 163 . The current sensor 172 is, for example, a magnetic detection Hall IC. The current sensor 172 is arranged facing the surface of the winding connection member 163 on the rear side Z2 at the position where the magnetic shield 171 is arranged. placed inside. The current sensor 172 has a plurality of leads 173 protruding from the sensor main body and connected to the control circuit 103 by a conductive member such as solder. The output of the current sensor 172 corresponding to the detected magnetic field is taken into the control circuit 103, and the current value flowing through the winding connection member 163 is detected. Control circuit 103 controls power module 160 based on the detected current value.

By configuring in this way, the winding connection member 163 and the current sensor 172, which are current measuring units, are arranged with respect to the case 102 to which the magnetic shield 171 is fixed, so that each component is arranged separately. Since the positional accuracy of component placement can be improved compared to the case where the current sensor 172 does, the current detection accuracy of the current sensor 172 can be improved. In addition, since the control circuit 103 and the current sensor 172 are accommodated inside the case 102 of the power supply unit 300, the wiring length from the control circuit 103 to the current sensor 172 is shortened. can be obtained. In addition, since the components inside the power supply unit 300 can be easily sealed with the sealing resin 105, vibration resistance and water resistance inside the power supply unit 300 can be easily ensured. Further, since the operation test of the current sensor 172 can be performed only with the power supply unit 300, defective products can be found before the rotary electric machine 100 is assembled. Contributes to cost reduction.

Also, the power module 160 and the current sensor 172 are not integrated. Therefore, the number of control connection members 164 does not increase. When connecting the control connection member 164 and the control circuit 103 by partial flow soldering, the control connection member requires a wider interval between terminals than reflow soldering used for mounting the components of the control circuit 103. 164 does not increase, it is possible to suppress an increase in size of the power module 160 . In addition, since an increase in size of the control circuit 103 is also suppressed, an increase in size of the rotary electric machine 100 can be suppressed.

In this embodiment, at least one of the leads 173 extends from the sensor main body to the rear side Z2, and then extends along the front side Z1 surface of the circuit board 103a of the control circuit 103. It has an extending portion 173a extending in a direction orthogonal to the extending direction and the axial direction. The extending portion 173a is connected to the circuit board 103a. With this configuration, even when the control connection member 164 and the control circuit 103 are connected by partial jet soldering, the positional displacement of the current sensor 172 due to disconnection of the already connected lead 173 can be minimized. , and shorts due to solder bridging or migration do not occur. Therefore, the rotating electrical machine 100 with high quality can be provided.

In the present embodiment, the width of the opening 171a of the magnetic shield 171 is greater than the width of the sandwiched portion 163a, which is the portion of the winding connection member 163 sandwiched between the magnetic shields 171 . With this configuration, the magnetic shield 171 and the winding connection member 163 can be separated from each other, so that the magnetic shield 171 and the winding connection member 163 can be easily insulated. Further, the winding connection member 163 can be easily arranged from the side of the opening 171a of the magnetic shield 171, so the productivity of the rotating electric machine 100 can be improved.

In the present embodiment, the width of sandwiched portion 163a is narrower than the width of portions of winding connection member 163 in front of and behind sandwiched portion 163a in the projecting direction of winding connection member 163 . With this configuration, the width of the opening 171a of the magnetic shield 171 can be narrowed. By narrowing the width of the opening 171a, the amount of magnetic flux entering the inside of the magnetic shield 171 from the outside is reduced, so that the magnetic noise received by the current sensor 172 from the outside can be reduced. Further, by narrowing the width of the opening 171a of the magnetic shield 171, the size of the magnetic shield 171 can be reduced. When the width of the winding connection member 163 is narrowed, the density of the current flowing through the winding connection member 163 increases in the portion where the width is narrowed. easier to rise. However, in the present embodiment, only the sandwiched portion 163a sandwiched between the magnetic shields 171 of the winding connection member 163 has a narrow width. The current can be measured with accuracy, and an increase in size of the power module 160 can be suppressed.

<Method for Assembling Rotary Electric Machine 100>
In the method of assembling the rotating electrical machine 100, the assembly process for assembling the power supply unit 300 to the rotating electrical machine body 200 will be described with reference to FIGS. 8 to 12. FIG. 8 to 12 are cross sections taken at the opening 171a of the magnetic shield 171. FIG. The assembly process comprises six steps.

In a first step, the case 102 is fixed to the heat sink 110 . FIG. 8 shows a cross section of the power supply unit 300 after the first step. A fixing method is, for example, screwing. A positive electrode side wiring member 154 , a winding side wiring member 156 , and a magnetic shield 171 are fixed in advance to the case 102 .

In a second step, power module 160 is fixed to heat sink 110 . FIG. 9 shows a cross section of the power supply unit 300 after the second step. A heat sink fixing surface 167 of the power module 160 is positioned at the opening of the bottom wall 102 a and is thermally connected and fixed to the heat sink 110 . The heat sink 110 has a protrusion 110a that protrudes into the opening of the bottom wall 102a. The heat sink fixing surface 167 is fixed to the projecting portion 110a. When fixing the power module 160 to the heat sink 110 , the winding connection member 163 of the power module 160 is arranged inside the magnetic shield 171 from the opening 171 a of the magnetic shield 171 . In addition, the positive electrode side connecting member 161 and the positive electrode side wiring member 154, the negative electrode side connecting member 162 (not shown in FIG. 9) and the negative electrode side wiring member, and the winding connection member 163 and the winding side wiring member 156 are connected respectively. be done.

In a third step, the control circuit 103 to which the current sensor 172 is fixed is fixed to the case 102 . FIG. 10 shows a cross section of the power supply unit 300 after the third step. The control circuit 103 is fixed to the case 102 by screws, heat caulking, riveting, adhesion, or the like. The current sensor 172 is arranged inside the opening 171a of the magnetic shield 171 facing the surface of the winding connection member 163 on the rear side Z2. Also, the control circuit 103 and the control connection member 164 of the power module 160 are connected by partial flow soldering from the rear side Z2 of the circuit board 103a. Therefore, the control connection members 164 are arranged at such intervals that adjacent control connection members 164 are not erroneously connected by solder.

In the fourth step, the inside of case 102 is sealed with sealing resin 105 . The fourth step is the resin sealing step. FIG. 11 shows a cross section of the power supply unit 300 after the fourth step. A liquid sealing resin 105 is sealed from the rear side Z2 of the case 102 . The sealing resin 105 is sealed up to a position where the control circuit 103 and the control connecting member 164 are covered. After enclosing the sealing resin 105, the entire power supply unit 300 is heated, and the sealing resin 105 is cured by heating.

In the fifth step, power supply unit 300 is fixed to rotary electric machine body 200 . FIG. 12 shows a cross section of the power supply unit 300 and the rotary electric machine body 200 after the fifth step. The winding wiring member fixing portion 114 and the winding wiring member 113 are attached to the rotary electric machine body portion 200 . First, the power supply unit 300 is fixed to the rear side Z2 of the rotary electric machine main body 200 by screwing, for example. After that, the winding wiring member 156 and the winding wiring member 113 are connected.

In a sixth step, cover 101 is fixed to power supply unit 300 . FIG. 2 shows the rotary electric machine 100 after completion of the assembly process. The cover 101 is fixed to the rear side Z2 of the power supply unit 300 by screwing, for example.

Since the winding connection member 163 and the current sensor 172 are arranged and fixed to the case 102 to which the magnetic shield 171 is fixed, compared to the case where each part is separately arranged and fixed. Since the positional accuracy of the arrangement of the components can be improved by using the In addition, in the resin sealing process, the sealing resin 105 can be heated and cured only in the power supply unit 300, not in the entire rotating electrical machine 100. Therefore, the rotating electrical machine 100 can be assembled easily and at low cost without deteriorating productivity. can be done.

As described above, in the rotating electric machine 100 according to Embodiment 1, the power module 160 included in the power supply unit 300 has a winding connection protruding from the main body along the surface of the bottom wall 102a of the case 102 on the rear side Z2. A magnetic shield 171 having a U-shaped cross section and opening to the other side in the axial direction is fixed to the bottom wall 102a, which has a member 163 and surrounds the winding connection member 163 except for the surface on the rear side Z2. The sensor 172 is arranged to face the surface of the winding connection member 163 on the rear side Z2 at the arrangement position of the magnetic shield 171, and the current sensor 172 is arranged inside the U-shaped opening 171a in the magnetic shield 171. Therefore, the winding connecting member 163 and the current sensor 172, which are the current measuring section, are arranged with respect to the case 102 to which the magnetic shield 171 is fixed. Since the positional accuracy of component placement can be increased, the current detection accuracy of the current sensor 172 can be improved. In addition, since the control circuit 103 and the current sensor 172 are accommodated inside the case 102 of the power supply unit 300, the wiring length from the control circuit 103 to the current sensor 172 is shortened. can be obtained. In addition, since the operation test of the current sensor 172 can be performed only with the power supply unit 300, defective products can be found before the rotating electric machine 100 is assembled. 100 can be obtained.

When the front side Z1 portion of the magnetic shield 171 is embedded in the bottom wall 102a, the positional accuracy of the magnetic shield 171 can be enhanced. When the front side Z1 portion of the magnetic shield 171 is embedded in the bottom wall 102a by integral molding, the positional accuracy of the magnetic shield 171 can be further enhanced. Further, when the width of the opening 171a of the magnetic shield 171 is larger than the width of the sandwiched portion 163a, which is the portion of the winding connection member 163 sandwiched between the magnetic shields 171, the magnetic shield 171 and the winding connection member 163 are separated from each other. Since they can be provided apart from each other, the magnetic shield 171 and the winding connection member 163 can be easily insulated. Further, the winding connection member 163 can be easily arranged from the side of the opening 171a of the magnetic shield 171, so the productivity of the rotating electric machine 100 can be improved.

If the width of the sandwiched portion 163a is narrower than the width of the portion of the winding connection member 163 in front of and behind the sandwiched portion 163a in the projecting direction of the winding connection member 163, the width of the opening 171a of the magnetic shield 171 can be narrowed. Since less magnetic flux enters the inside of the magnetic shield 171 from the outside, the magnetic noise received by the current sensor 172 from the outside can be reduced. Further, by narrowing the width of the opening 171a of the magnetic shield 171, the size of the magnetic shield 171 can be reduced.

When the main body of the power module 160 is formed in a rectangular plate shape, and the winding connection members 163 protrude one by one from both ends in the longitudinal direction of one side surface of the main body, the current detection unit 170 The current detector 170 can be easily arranged at a position distant from the control connection member 164 so that the current detection unit 170 does not interfere with the control connection member 164 . In addition, when the current detectors 170 are arranged at both ends, there are two spaces for avoiding interference, so that the power module 160 can be prevented from increasing in size.

The first winding-side wiring member 156a extends in the circumferential direction and penetrates the circumferential wall 102b, connecting the radially outer end of the winding connection member 163 on one side in the circumferential direction and the winding on the one side in the circumferential direction. The second winding-side wiring member 156b extends in the circumferential direction, penetrates the peripheral wall 102b, and connects to the radially outer end of the winding connection member 163 on the other side in the circumferential direction. and the winding wiring member 113 on the other side in the circumferential direction, using the space adjacent to the two winding connection members 163 and the control connection member 164, the winding side wiring member 156 and Since the winding wiring member 113 can be connected, an increase in the size of the rotating electrical machine 100 can be suppressed, and the rotating electrical machine 100 can be made smaller.

After at least one of the leads 173 extends from the main body of the sensor to the rear side Z2, along the surface of the front side Z1 of the circuit board 103a of the control circuit 103, the extending direction and the axial direction of the winding connection member 163 are perpendicular to each other. When the extending portion 173a is connected to the circuit board 103a, and when the control connecting member 164 and the control circuit 103 are connected by partial jet soldering, However, the high-quality rotating electric machine 100 can be provided because there is no occurrence of defects such as misalignment of the current sensor 172 due to disconnection of the already connected leads 173 and defects such as short circuits due to solder bridges or migration. can do. Further, when the sealing resin 105 for sealing the power module 160, the control circuit 103, and the current sensor 172 is provided inside the case 102, the inside of the power supply unit 300 is sealed with the sealing resin 105. , the moisture resistance, water resistance, insulation, and vibration resistance of internal parts can be enhanced.

Embodiment 2.
A rotating electric machine 100 according to Embodiment 2 will be described. FIG. 13 is a cross-sectional view showing a main part of power supply unit 300 of rotating electrical machine 100 according to Embodiment 2, cut at the same position as in FIG. FIG. 15 is a plan view showing a part of a current sensor 172 and a current sensor holder 174 as seen from the front side Z1, and FIG. 5, and FIG. 16 is a cross-sectional view showing a main part of a power supply unit 300 of another rotating electric machine 100 according to Embodiment 2, cut at a position equivalent to FIG. It is a diagram. Rotating electric machine 100 according to Embodiment 2 is configured to include a current sensor holder 174 surrounding current sensor 172 .

Current sensor 172 has a current sensor holder 174 that surrounds current sensor 172 . The current sensor holder 174 is fitted inside the magnetic shield 171 . Since the current sensor holder 174 has a shape that fits with the magnetic shield 171, the positional accuracy of the current sensor 172 and the magnetic shield 171 can be improved. Since the positional accuracy of the current sensor 172 and the magnetic shield 171 is improved, the current detection accuracy of the current sensor 172 can be improved. Also, the current sensor 172 and the magnetic shield 171 can be assembled easily and accurately.

The current sensor holder 174 has a space and a protrusion inside. The sensor main body can be accurately positioned by the protrusion contacting the sensor main body of the current sensor 172 . Further, the sensor body of the current sensor 172 can be easily inserted into the space inside the current sensor holder 174 . The current sensor holder 174 has a fitting portion 174a fitted to a fitting portion 103b formed on the circuit board 103a of the control circuit 103. As shown in FIG. By fitting the fitting portion 103b and the fitting portion 174a together, the current sensor 172 can be accurately positioned and fixed to the circuit board 103a.

In the present embodiment, extension 173a is formed on lead 173 to connect current sensor 172 to control circuit 103, but extension 173a is preferably short in order to reduce the mounting area. Since the fitting portion 103b and the fitting portion 174a are fitted together to fix the current sensor 172 to the circuit board 103a, the extending portion 173a is connected to the circuit board 103a while the current sensor 172 is fixed to the control circuit 103. It can be soldered to the substrate 103a. Therefore, in the present embodiment, even if the extending portion 173a is shortened, the current sensor 172 can be fixed to the circuit board 103a with high positional accuracy without being displaced or tilted during soldering. .

At least one extending portion 173a of the lead 173 of the current sensor 172 protrudes from the current sensor holder 174 when the current sensor holder 174 is viewed in the direction of the rear side Z2, as shown in FIG. Since the extending portion 173a protrudes from the current sensor holder 174 when viewed in the direction of the rear side Z2, even if a connection failure occurs in the lead 173, it is possible to easily detect the connection failure in the inspection, thereby improving reliability. It is possible to provide the rotating electric machine 100 with high durability. A notch portion may be provided in the current sensor holder 174 so that the extending portion 173a can be easily seen when viewed in the direction of the rear side Z2.

As shown in FIG. 15, the end of the current sensor holder 174 on the front side Z1 may be tapered. With this configuration, the current sensor holder 174 is easily fitted to the magnetic shield 171, so the productivity of the rotary electric machine 100 can be improved. Since the productivity of the rotating electric machine 100 is improved, the inexpensive rotating electric machine 100 can be provided.

As shown in FIG. 16, the current sensor holder 174 may be fitted with the case 102 . The magnetic shield 171 is embedded in the portion of the bottom wall 102a that protrudes toward the rear side Z2. The current sensor holder 174 has a fitting portion 174b fitted to the fitting portion 102c formed in the rear side Z2 portion of the magnetic shield 171 in the bottom wall 102a. By configuring in this way, by providing the fitting portion 102c on the side of the case 102 instead of providing the fitting portion on the magnetic shield 171, the shape of the fitting portion can be formed with a high degree of freedom. The productivity of the rotary electric machine 100 can be improved, and the assembly accuracy of the rotating electric machine 100 can be further improved.

As described above, in rotating electric machine 100 according to Embodiment 2, current sensor 172 has current sensor holder 174 surrounding current sensor 172, and current sensor holder 174 is fitted inside magnetic shield 171. Since the accuracy of the positions of the current sensor 172 and the magnetic shield 171 can be improved, the current detection accuracy of the current sensor 172 can be improved. Further, when the current sensor holder 174 has a fitting portion 174b fitted to the fitting portion 102c formed on the other side of the bottom wall 102a in the axial direction of the magnetic shield 171, the case 102 side Since the shape of the fitting portion 102c with a high degree of freedom can be formed by providing the fitting portion 102c at the , the productivity of the rotary electric machine 100 can be improved.

If the current sensor holder 174 has a fitting portion 174a fitted to the fitting portion 103b formed on the circuit board 103a of the control circuit 103, the fitting portion 103b and the fitting portion 174a are fitted together. Therefore, the current sensor 172 can be accurately positioned and fixed to the circuit board 103a. Further, when the end of the current sensor holder 174 on the front side Z1 is tapered, the current sensor holder 174 is easily fitted to the magnetic shield 171, so that the productivity of the rotating electric machine 100 can be improved. .

When at least one extension 173a of the lead 173 of the current sensor 172 protrudes from the current sensor holder 174 when the current sensor holder 174 is viewed in the direction of the rear side Z2, the connection of the extension 173a is detected during inspection. Since defects can be easily detected, a highly reliable rotating electric machine 100 can be provided.

Embodiment 3.
A rotating electrical machine 100 according to Embodiment 3 will be described. FIG. 17 is a cross-sectional view showing a main part of power supply unit 300 of rotating electrical machine 100 according to Embodiment 3, cut at the same position as in FIG. FIG. 19 is a plan view showing the current sensor 172 as seen from the front side Z1, and FIG. FIG. 20 is a diagram cut at a similar position, and FIG. 20 is a plan view showing a main part of power supply unit 300 of another rotating electrical machine 100 according to Embodiment 3, and is a diagram of current sensor 172 viewed from front side Z1. The rotary electric machine 100 according to Embodiment 3 has a configuration in which the current sensor 172 includes leads 173 having different shapes.

In this embodiment, current sensor 172 has four leads 173 . Four leads 173 extend from the main body of the sensor to the rear side Z2. Of the four leads 173, two leads 173 provided on both sides are inserted into through holes provided in the circuit board 103a of the control circuit 103 and fixed. Of the four leads 173, the two inner leads 173 extend to the rear side Z2 and then extend to the front side Z1 surface of the circuit board 103a of the control circuit 103 to connect the winding connection member 163. and an extending portion 173a extending in a direction orthogonal to the extending direction and the axial direction. The extending portion 173a is connected to the circuit board 103a by soldering.

With this configuration, when the control connection member 164 of the power module 160 is fixed by partial flow soldering from the rear side Z2 in the third step shown in FIG. In addition, it is possible to suppress the occurrence of defects due to the formation of solder bridges between the leads 173 on both sides. Also, the solder that fixes the extending portion 173a to the front side Z1 of the circuit board 103a is not melted by the partial flow soldering of the rear side Z2. Therefore, even when the current sensor holder 174 is not used, the current sensor 172 can be fixed to the control circuit 103 with high accuracy.

In this embodiment, two of the four leads 173 at both ends are fixed to the through holes of the circuit board 103a, and the inner two are fixed to the front side Z1, but the present invention is not limited to this. is not. Only one lead 173 may be fixed to the through hole of the circuit board 103a. Alternatively, the lead 173 may be cut at the bent portion without providing the extending portion 173a, and the cut portion may be fixed to the front side Z1 of the circuit board 103a with solder or resin material.

As shown in FIGS. 19 and 20, the extending portions 173a of the two inner leads 173 among the four leads 173 may extend in different directions. By configuring in this way, when the current sensor 172 is mounted on the circuit board 103a, since the extending portions 173a extending in different directions are present, it is possible to suppress the tilting of the current sensor 172 during mounting. . Therefore, even when the current sensor holder 174 is not used, the current sensor 172 can be fixed to the control circuit 103 with higher accuracy.

As described above, in the rotating electric machine 100 according to the third embodiment, two leads 173 provided on both sides of the four leads 173 of the current sensor 172 are connected to the through holes provided in the circuit board 103a of the control circuit 103. The two leads 173 are inserted and fixed, and the extending portions 173a of the two leads 173 provided inside are connected to the circuit board 103a by soldering, so that the control connection member 164 is fixed by partial flow soldering from the rear side Z2. When doing so, it is possible to suppress the occurrence of defects due to the formation of solder bridges or the like between the leads 173 on both sides inserted and fixed in the through holes. In addition, since the solder that fixes the extending portion 173a is not melted by the partial flow soldering on the rear side Z2, the current sensor 172 can be accurately fixed to the control circuit 103 even when the current sensor holder 174 is not used. can do.

Embodiment 4.
A rotating electric machine 100 according to Embodiment 4 will be described. FIG. 21 is a cross-sectional view showing a main part of power supply unit 300 of rotating electric machine 100 according to Embodiment 4, cut at the same position as in FIG. 5, and FIG. is a plan view showing the parts, and is a view of the current sensor 172 as seen from the front side Z1. Rotational electric machine 100 according to Embodiment 4 is configured such that current sensor 172 is fixed by current sensor fixing portion 175 .

In this embodiment, current sensor 172 has four leads 173 . Four leads 173 extend from the main body of the sensor to the rear side Z2. Of the four leads 173, the two leads 173 provided first and third from the top in FIG. Of the four leads 173, the two leads 173 provided second and fourth from the top in FIG. , there is an extending portion 173a extending in a direction orthogonal to the extending direction of the winding connection member 163 and the axial direction. As shown in FIG. 21, the extending portion 173a has a fixing portion 173b that extends to the rear side Z2. The fixed portion 173b is inserted into a through hole provided in the circuit board 103a of the control circuit 103 and fixed. The extending portion 173a is fixed by a current sensor fixing portion 175 to the front side Z1 of the circuit board 103a. The current sensor fixing portion 175 is solder, thermosetting adhesive, or the like. The lead 173 having the extending portion 173a and the fixing portion 173b is not limited to the second and fourth leads from the top in FIG.

As described above, in the rotary electric machine 100 according to the fourth embodiment, since the extending portion 173a is fixed to the front side Z1 of the circuit board 103a by the current sensor fixing portion 175, the lead 173 is inserted into the through hole provided in the circuit board 103a. When fixing the control connection member 164 of the power module 160 by partial flow soldering from the rear side Z2 in the third step shown in FIG. 173 can be connected to the control circuit 103 . In addition, since the leads 173 are bent every other lead, the adjacent bent leads are separated from each other, and even if they are fixed by partial flow soldering or the like, the bent leads are connected by a solder bridge. It is possible to suppress the occurrence of defects. Therefore, the rotating electrical machine 100 with high reliability can be provided.

Also, while this application has described various exemplary embodiments and examples, various features, aspects, and functions described in one or more of the embodiments may vary from particular embodiment to specific embodiment. The embodiments are applicable singly or in various combinations without being limited to the application.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

Reference Signs List 1 front bracket 2 rear bracket 3 stator 3a stator core 3b stator winding 3c stator winding terminal 4 rotating shaft 5 rotor 5a field core 5b field winding 71 Bearing 72 Bearing 9 Pulley 101 Cover 101a Bottom wall 101b Peripheral wall 102 Case 102a Bottom wall 102b Peripheral wall 102c Fitting part 15 Bolt 103 Control circuit 103a Circuit board 103b Fitting part 105 sealing resin 110 heat sink 110a protruding portion 111 fin 113 winding wiring member 114 winding wiring member fixing portion 151 positive electrode side power supply terminal 154 positive electrode side wiring member 156 winding side wiring member 156a 1 winding-side wiring member 156b second winding-side wiring member 160 power module 161 positive electrode side connection member 162 negative electrode side connection member 163 winding connection member 163a sandwiched portion 164 control connection member , 165 insulating resin material, 167 heat sink fixing surface, 170 current detector, 171 magnetic shield, 171a opening, 172 current sensor, 173 lead, 173a extending portion, 173b fixing portion, 174 current sensor holder, 174a fitting portion, 174b fitting portion 175 current sensor fixing portion 100 rotating electrical machine 200 rotating electrical machine main body 300 power supply unit C axial center

Claims (13)

a rotating shaft, a rotor that rotates integrally with the rotating shaft, a stator disposed radially outside the rotor and having a stator iron core wound with stator windings, the rotor and the stator a rotary electric machine main body provided with a bracket that covers the outside of a child and holds one end side and the other end side of the rotating shaft via bearings;
A power module having a power semiconductor element for turning on and off a current supplied to the stator winding, a cooler for cooling the power module, a current sensor for detecting the current flowing through the power module, and controlling the power module. and a plate-shaped bottom wall covering one side in the axial direction of the power module, the control circuit, and the current sensor and extending in the radial direction and the circumferential direction, the power module, the control circuit a circuit and a case that houses the current sensor, and a power supply unit arranged on the other side of the bracket in the axial direction,
The power module has a bus bar protruding from the main body along the other axial surface of the bottom wall,
A U-shaped or C-shaped magnetic shield whose cross section is open to the other side in the axial direction is fixed to the bottom wall, surrounding the bus bar except for the other side in the axial direction,
the current sensor is arranged to face the surface of the bus bar on the other side in the axial direction at the position where the magnetic shield is arranged;
The electric rotating machine, wherein the current sensor is arranged inside the U-shaped or C-shaped opening in the magnetic shield. The rotary electric machine according to claim 1, wherein one axial portion of the magnetic shield is embedded in the bottom wall. 3. The electric rotating machine according to claim 1, wherein the width of the opening of the magnetic shield is larger than the width of the sandwiched portion, which is the portion of the bus bar sandwiched between the magnetic shields. 4. The electric rotating machine according to claim 3, wherein the width of said sandwiched portion is narrower than the width of portions of said bus bar in front of and behind said sandwiched portion in a projecting direction of said bus bar. 5. The power module according to any one of claims 1 to 4, wherein the main body of the power module is formed in a rectangular plate shape, and the bus bars protrude one by one from each of both ends in the longitudinal direction of one side surface of the main body. The rotary electric machine according to any one of items 1 and 2. Two winding wiring members connected to the stator winding and extending from the bracket to the other side in the axial direction, and two winding wiring members connecting each of the two winding wiring members and each of the two bus bars. and a connecting busbar,
the case has a peripheral wall covering the power module, the control circuit, and the current sensor in a radial direction;
the two busbars are circumferentially spaced apart and extend toward the peripheral wall;
The two winding wiring members are arranged circumferentially adjacent to each other on the radially outer side of the peripheral wall at a position in the circumferential direction between the two bus bars,
The first connection bus bar extends in the circumferential direction and penetrates the peripheral wall, and includes a radially outer end portion of the bus bar on one side in the circumferential direction and the winding wiring member on the one side in the circumferential direction. connect the
The second connection bus bar extends in the circumferential direction and penetrates the peripheral wall, and connects a radially outer end portion of the bus bar on the other side in the circumferential direction and the winding wiring member on the other side in the circumferential direction. The rotary electric machine according to claim 5, wherein the . The control circuit has a circuit board extending radially and circumferentially,
the current sensor has a plurality of leads protruding from the sensor body and connected to the control circuit;
At least one of the leads extends from the sensor main body to the other side in the axial direction, and then extends along the surface of the circuit board on the one side in the axial direction. The rotating electric machine according to any one of claims 1 to 6, further comprising an extending portion extending in a direction to which the rotating electric machine extends, and wherein the extending portion is connected to the circuit board. the current sensor having a current sensor holder surrounding the current sensor;
The electric rotating machine according to any one of claims 1 to 7, wherein the current sensor holder is fitted inside the magnetic shield. The magnetic shield is embedded in a portion of the bottom wall protruding to the other side in the axial direction,
9. The electric rotating machine according to claim 8, wherein the current sensor holder has a fitting portion fitted to a fitting portion formed on the bottom wall on the other side in the axial direction of the magnetic shield. The control circuit has a circuit board extending radially and circumferentially,
10. The electric rotating machine according to claim 8, wherein the current sensor holder has a fitting portion fitted to a fitting portion formed on the circuit board. The rotary electric machine according to any one of claims 8 to 10, wherein one axial end of the current sensor holder is tapered. The control circuit has a circuit board extending radially and circumferentially,
the current sensor has a plurality of leads protruding from the sensor body and connected to the control circuit;
At least one of the leads extends from the sensor main body to the other side in the axial direction, and then extends along the surface of the circuit board on the one side in the axial direction. 12. Any one of claims 8 to 11, further comprising an extension portion extending in a direction toward the current sensor holder, the extension portion projecting from the current sensor holder when the current sensor holder is viewed in the direction of the other side in the axial direction. 1. The rotary electric machine according to claim 1. The electric rotating machine according to any one of claims 1 to 12, further comprising a sealing resin inside the case for sealing the power module, the control circuit, and the current sensor.

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