JP2020137148A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine which enables improvement of cooling efficiency of a power module and a control circuit and can inhibit enlargement of a cooling mechanism.SOLUTION: A rotary electric machine includes: a module heat radiation member 110 that is a radiation member thermally connected to a power module; a control circuit 170; a refrigerant passage 180 in which a refrigerant flows in at least an arrangement space of the module heat radiation member 110; and a control circuit cooling mechanism 106 which cools the control circuit 170 with a refrigerant flowing to the arrangement space of the module heat radiation member 110.SELECTED DRAWING: Figure 2

Description

The present application relates to a rotary electric machine.

The rotary electric machine includes a rotary electric machine main body composed of a rotor and a stator, and a power supply unit composed of an inverter and a control circuit for supplying electric power to the rotary electric machine main body. Due to space saving and ease of mounting, and shortening of the wiring harness that connects the rotary electric machine main body and the inverter, a mechanical and electrical integrated rotary electric machine that integrates the rotary electric machine main body and the power supply unit is available. It is being developed.

For example, in the rotary electric machine disclosed in Patent Document 1, the heat radiation fins of the power module constituting the inverter and the heat radiation fins of the control circuit are arranged so as to face each other with an axial interval. The cooling air generated by the blower fan is configured to pass between the two heat radiation fins.

Japanese Unexamined Patent Publication No. 2015-122856

However, in the technique of Patent Document 1, since the cooling air flows between the two facing radiating fins, the pressure loss increases and the cooling air is distributed to the two radiating fins. Therefore, there is a problem that the flow velocity of the cooling air distributed to each heat radiation fin is lowered and the cooling efficiency of each heat radiation fin is lowered.

In addition, separate heat radiation fins are required for the power module and the control circuit, and in order to arrange the two heat radiation fins so as to face each other with an axial distance between them, the space for arranging the two heat radiation fins is large. growing. In addition, the opening for introducing cooling air from the outside also becomes large. Therefore, there is a problem that the rotary electric machine becomes long in the axial direction and becomes large. In particular, when a rotary electric machine is installed in an automobile engine room, it is required that it can be installed in a limited space.

Therefore, a rotary electric machine capable of improving the cooling efficiency of the power module and the control circuit and suppressing the increase in size of the cooling mechanism is desired.

The rotary electric machine according to the present application is
Stator with multi-phase winding and
A rotor arranged radially inside the stator and
A rotating shaft that rotates integrally with the rotor,
A bracket that accommodates the stator and the rotor and rotatably supports the rotating shaft.
A power module provided with a power semiconductor element that turns on and off the energization of the winding, and
A module heat radiating member which is a heat radiating member thermally connected to the power module,
A control circuit that controls the power semiconductor element and
At least the refrigerant flow path through which the refrigerant flows in the arrangement space of the module heat dissipation member,
It is provided with a control circuit cooling mechanism that cools the control circuit by the refrigerant flowing in the arrangement space of the module heat radiating member.

According to the rotary electric machine according to the present application, the control circuit can be cooled by the control circuit cooling mechanism by using the refrigerant flowing in the arrangement space of the module heat dissipation member of the power module. Since it is not necessary to distribute and supply the refrigerant to the module heat dissipation member and the control circuit cooling mechanism, the flow velocity loss can be reduced, so that the flow velocity is increased and the cooling efficiency of both the module heat dissipation member and the control circuit cooling mechanism is improved. Can be improved. Further, the control circuit cooling mechanism can be arranged on the downstream side of the module heat dissipation member, the width of the entire cooling mechanism with respect to the flow direction of the refrigerant can be suppressed, and the size of the rotary electric machine can be suppressed from becoming large.

It is a perspective view of the rotary electric machine which concerns on Embodiment 1. FIG. It is sectional drawing which cut the rotary electric machine which concerns on Embodiment 1 in the plane passing through the axis of rotation axis. It is a perspective view of one power module and a module heat dissipation member which concerns on Embodiment 1. FIG. It is a circuit diagram of the power semiconductor element provided in one power module which concerns on Embodiment 1. FIG. It is a side view which saw one power module and module heat dissipation member which concerns on Embodiment 1 from the outside in the radial direction. It is sectional drawing which cut the rotary electric machine which concerns on Embodiment 2 in the plane passing through the axis of the rotating shaft. It is sectional drawing which cut the rotary electric machine which concerns on Embodiment 3 in the plane passing through the axis of the rotation axis. It is sectional drawing which cut the rotary electric machine which concerns on Embodiment 4 in the plane passing through the axis of rotation axis. FIG. 5 is a cross-sectional view of the rotary electric machine according to the fifth embodiment cut by a plane passing through the axis of the rotating shaft. It is sectional drawing which cut | cut the rotary electric machine which concerns on Embodiment 6 in the plane passing through the axis of rotation axis. It is sectional drawing which cut | cut the rotary electric machine which concerns on Embodiment 6 in the plane passing through the axis of rotation axis. FIG. 5 is a cross-sectional view of the rotary electric machine according to the seventh embodiment cut by a plane passing through the axis of the rotating shaft. FIG. 5 is a cross-sectional view of the rotary electric machine according to the eighth embodiment cut by a plane passing through the axis of the rotating shaft. FIG. 5 is a perspective view of two paired power modules and a module heat radiating member according to a ninth embodiment.

Hereinafter, preferred embodiments of the rotary electric machine according to the present application will be described with reference to the drawings. The same or corresponding parts in each figure will be described with the same reference numerals. In the illustrations between the drawings, the sizes and scales of the corresponding components are independent of each other.

1. 1. Embodiment 1
The rotary electric machine 100 according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of the rotary electric machine 100. FIG. 2 is a schematic cross-sectional view of the rotary electric machine 100 cut along a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4. FIG. 3 is a perspective view of one power module 160 and a module heat radiating member 110. FIG. 4 is a circuit diagram of a power semiconductor element provided in one power module 160, and FIG. 5 is a side view of the power module 160 and the module heat radiating member 110 as viewed from the radial outer side Y2.

In the present application, the direction parallel to the axial center C of the rotating shaft 4 is defined as the axial direction Z, one side Z1 in the axial direction is referred to as the front side Z1, and the axial direction opposite to the one side Z1 in the axial direction. The other side Z2 is referred to as the rear side Z2. The radial direction Y and the circumferential direction X are the radial direction and the circumferential direction with respect to the axial center C of the rotating shaft 4.

<Rotating electric machine body 200>
The rotary electric machine 100 includes a rotary electric machine main body 200. The rotor main body 200 includes a stator 3 having a plurality of phases of windings, a rotor 6 arranged on the radial inner side Y1 of the stator 3, a rotating shaft 4 that rotates integrally with the rotor 6, and a stator. A bracket for accommodating the 3 and the rotor 6 and for rotatably supporting the rotating shaft 4 is provided.

In the present embodiment, the bracket is composed of a front side bracket 1 on the front side Z1 and a rear side bracket 2 on the rear side Z2. The front side bracket 1 has a cylindrical outer peripheral wall and a disk-shaped side wall extending radially inward Y1 from the end of the front side Z1 of the outer peripheral wall, and the rotation shaft 4 is located at the center of the side wall. There is a through hole through which the front bearing 71 is fixed. The rear side bracket 2 has a cylindrical outer peripheral wall and a disk-shaped side wall extending radially inward Y1 from the end of the rear side Z2 of the outer peripheral wall, and the rotation shaft 4 is located at the center of the side wall. There is a through hole through which the rear bearing 72 is fixed. The front side bracket 1 and the rear side bracket 2 are connected by a bolt 15 extending in the axial direction Z.

The end portion of the front side Z1 of the rotating shaft 4 penetrates the through hole of the front side bracket 1 and projects to the front side Z1 from the front side bracket 1, and the pulley 9 is fixed to this protruding portion. A belt is hung between the pulley 9 and the pulley 9 fixed to the crankshaft of the engine (not shown), and the rotational driving force is transmitted between the rotary electric machine 100 and the engine.

The end portion of the rear side Z2 of the rotating shaft 4 penetrates the through hole of the rear side bracket 2 and projects to the rear side Z2 from the rear side bracket 2, and a pair of slip rings 90 are provided in this protruding portion. ing. The pair of slip rings 90 are connected to the field winding 62 of the rotor 6.

The rotor 6 includes a field winding 62 and a field iron core 61. The rotor 6 is a Randell type (also referred to as a claw pole type). The field iron core 61 is formed from a cylindrical central portion, a front side claw portion extending from the end portion of the front side Z1 of the central portion to the radial outer side Y2 of the central portion, and an end portion of the rear side Z2 of the central portion. It is provided with a claw portion on the rear side extending to the radial outer side Y2 of the central portion. The insulated copper wire of the field winding 62 is wound concentrically around the outer peripheral surface of the central portion of the field iron core 61. The claws on the front side and the claws on the rear side are alternately provided in the circumferential direction X, and have different magnetic poles. For example, 6 or 8 claws on the front side and 6 or 8 claws on the rear side are provided, respectively.

The stator 3 is arranged so as to surround the rotor 6 with a minute gap, and has a cylindrical stator core 31 provided with a slot and a multi-phase winding wound around the slot of the stator core 31. The wire 32 and the like are provided. The multi-phase winding 32 is, for example, one set of three-phase windings, two sets of three-phase windings, one set of five-phase windings, or the like, and is set according to the type of rotary electric machine.

The multi-phase winding 32 has a front coil end portion protruding from the stator core 31 to the front side Z1 and a rear side coil end portion protruding from the stator core 31 to the rear side Z2. The lead wire of the multi-phase winding 32 penetrates the rear side bracket 2 and extends to the rear side Z2 (not shown).

The front side bracket 1 and the rear side bracket 2 are provided at intervals in the axial direction Z. The stator core 31 is sandwiched from both ends in the axial direction by the opening end portion of the rear side Z2 of the front side bracket 1 and the opening end portion of the front side Z1 of the rear side bracket 2.

A front side blower fan 81 having a plurality of blades is fixed to the end of the front side Z1 of the rotor 6 (field iron core 61), and is attached to the end of the rear side Z2 of the rotor 6 (field iron core 61). Is equipped with a rear side blower fan 82 having a plurality of blades, which rotate integrally with the rotor 6. The front-side blower fan 81 and the rear-side blower fan 82 cool the front-side coil end portion, the rear-side coil end portion, and the like arranged on the radial outer side Y2.

The rear side bracket 2 is provided with a plurality of openings 22 (hereinafter referred to as exhaust openings 22) dispersed in the circumferential direction at the portion of the rear side blower fan 82 on the radial outer side Y2, and is provided on the rear side Z2. A plurality of openings 21 (hereinafter, referred to as intake opening 21) are provided in the portions dispersed in the circumferential direction.

<Power supply unit 300>
The rotary electric machine 100 includes a power supply unit 300 that supplies electric power to the rotary electric machine main body 200. The power supply unit 300 is arranged on the rear side Z2 of the rotary electric machine main body 200 and is fixed to the rotary electric machine main body 200. The power supply unit 300 includes a plurality of power semiconductor elements, an inverter that performs DC-AC conversion between a DC power supply and a multi-phase winding, and a control circuit 170 that controls the power semiconductor elements. There is. In the present embodiment, the inverter is composed of a power module 160 provided with a power semiconductor element. Further, the power supply unit 300 includes a module heat radiating member 110 which is a heat radiating member thermally connected to the power module 160, a refrigerant flow path 180 through which a refrigerant flows at least in the arrangement space of the module heat radiating member 110, and a module heat radiating member 110. A control circuit cooling mechanism for cooling the control circuit 170 with the refrigerant flowing in the arrangement space of the above is provided.

The power supply unit 300 includes a pair of brushes that come into contact with a pair of slip rings 90 provided on a protruding portion of a rotating shaft 4 that protrudes from the rear side bracket 2 to the rear side Z2, and a field via the brush and the slip ring 90. It includes a power semiconductor element (not shown) for a field winding that turns on and off the power supplied to the winding 62. The power semiconductor element (switching element) for the field winding is on / off controlled by the control circuit 170. Further, a rotation sensor (not shown) for detecting rotation information of the rotation shaft 4 is provided on the protruding portion of the rear side Z2 of the rotation shaft 4. As the rotation sensor, a Hall element, a resolver, a magnetic sensor, an electromagnetic induction method, or the like is used.

The power supply unit 300 includes a cover 101 that covers each component of the power supply unit 300 such as the power module 160 and the control circuit 170. The cover 101 covers the rear side Z2 and the radial outer side Y2 of the control circuit 170, the power module 160, the module heat radiating member 110, and the like. The cover 101 is formed in a bottomed tubular shape that opens to the front side Z1. On the outer peripheral wall 101b of the cover 101 that covers the outer side Y2 in the radial direction, a positive electrode side power supply terminal 151 and a negative electrode side power supply terminal 152 for connecting an inverter to an external DC power supply, and a control circuit 170 are connected to an external control device. A control connector 153 for this is provided.

The outer peripheral wall 101b of the cover 101 is provided with a cover opening 101c, which will be described later, and is open to the outside. The rear side bottom wall 101a of the cover 101 that covers the rear side Z2 is not provided with an opening. The front side Z1 of the cover 101 is open, and the opening is covered with the rotary electric machine main body 200 (rear side bracket 2).

The control circuit 170 has a circuit element 105 and a circuit board 103 on which the circuit element 105 is mounted. The circuit board 103 is composed of a printed circuit board, a ceramic board, a metal board, or the like on which the circuit element 105 is mounted.

The control circuit 170 (circuit board 103) is arranged at intervals on the rear side Z2 of the rear side bracket 2. The control circuit 170 (circuit board 103) extends in the radial direction Y and the circumferential direction X. In the present embodiment, the circuit board 103 is formed in a disk shape, and its surface is orthogonal to the axial direction Z. The surface of the circuit board 103 may be tilted at an angle of 30 degrees or less with respect to a plane orthogonal to the axial direction Z.

The rotating shaft 4 extends from the rear side bracket 2 to the surface of the circuit board 103 on the front side Z1 to the rear side Z2. Therefore, the rotating shaft 4 does not penetrate the circuit board 103, and is arranged with a gap on the front side Z1 of the circuit board 103. According to this configuration, it is not necessary to provide the circuit board 103 with an opening for avoiding the rotating shaft 4. Therefore, the outer diameter of the circuit board 103 can be reduced, and the outer diameter of the power module 160 can be reduced in size and cost.

If the circuit element 105 can be arranged within a range that overlaps with the rear bracket 2 in the axial direction Z, the circuit board 103 may be provided with a through hole through which the rotating shaft 4 penetrates. Further, the circuit board 103 does not have to be disk-shaped as long as it fits within a range that overlaps with the rear bracket 2 in the axial direction Z, and may be composed of two or more circuit boards. The material of the circuit board may be different.

The power supply unit 300 is connected to the power semiconductor element 166H on the positive electrode side connected to the positive electrode side of the DC power supply and the negative electrode side of the DC power supply as shown in FIG. 4 for the winding of one phase. A set of a series circuit in which the power semiconductor element 166L on the negative electrode side is connected in series is provided. A connection point in which the power semiconductor element 166H on the positive electrode side and the power semiconductor element 166L on the negative electrode side are connected in series is connected to the winding of the corresponding phase. For example, when one set of three-phase windings is provided, three sets of series circuits are provided, and when two sets of three-phase windings are provided, six sets of series circuits are provided. Both or one of the power semiconductor elements 166H and 166L on the positive electrode side and the negative electrode side may be composed of two or more power semiconductor elements connected in parallel, respectively.

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 equipment such as motors, and control rated currents of several amperes to several hundred amperes. As a material for a power semiconductor element, silicon (Si), silicon carbide (SiC), gallium nitride (GaN), or the like may be used.

In the present embodiment, one power module 160 is provided with one series circuit of the power semiconductor element 166H on the positive electrode side and the power semiconductor element 166L on the negative electrode side. As shown in FIGS. 3 and 4, the power module 160 is connected to the positive electrode side connecting member 161 connected to the collector terminal of the power semiconductor element 166H on the positive electrode side and the emitter terminal of the power semiconductor element 166L on the negative electrode side. The winding connection member 163 connected to the connection point between the negative electrode side connecting member 162, the emitter terminal of the power semiconductor element 166H on the positive electrode side, and the collector terminal of the power semiconductor element 166L on the negative electrode side, the positive electrode side, and It includes a control connecting member 164 connected to a gate terminal or the like of the power semiconductor element 166H and 166L on the negative electrode side. A metal such as copper or a copper alloy having good conductivity and high thermal conductivity may be used for the positive electrode side connecting member 161, the negative electrode side connecting member 162, the winding connecting member 163, and the control connecting member 164, and the surface thereof may be used. May be plated with a metal material such as Au, Ni, Sn. Further, the metal and the plating material of each terminal may be composed of two or more types. In addition, 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 connecting members and the like is changed according to the number of power semiconductor elements.

The positive electrode side connecting member 161 is connected to the positive electrode side wiring member connected to the positive electrode side power supply terminal 151, and the negative electrode side connecting member 162 is connected to the positive electrode side wiring member connected to the negative electrode side power supply terminal 152, and is wound. The connecting member 163 is connected to a winding wiring member connected to the winding of the corresponding phase, and the control connecting member 164 is connected to the control circuit 170.

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

The power module 160 has a heat radiating member fixing surface 16 to which the module heat radiating member 110 is thermally connected. In the present embodiment, the power semiconductor element is fixed to one surface of the metal substrate, the ceramic substrate, the bus bar, etc., and the other surface of the metal substrate, the ceramic substrate, the bus bar, etc. has the heat dissipation member fixing surface 16. It is configured. The heat radiating member fixing surface 16 may be provided on the same side as the surface of the metal substrate, the ceramic substrate, the bus bar, etc. on which the power semiconductor element is fixed. Further, the two surfaces of the power module 160 which are opposite to each other may be the heat radiating member fixing surface 16, and the module heat radiating member 110 may be thermally connected to each surface.

In the present embodiment, a heat transfer material is interposed in the connection between the heat radiating member fixing surface 16 and the module heat radiating member 110 in order to reduce the contact thermal resistance. In the case of a metal substrate or a ceramic substrate, as the heat transfer material, for example, a conductive or insulating material such as grease, adhesive, sheet or gel, or a conductive member such as solder or silver paste is used. In the case of a lead that needs to be insulated from the module heat radiating member 110, a material having an insulating property is used as the heat transfer material. As a result, the power module 160 and the module heat radiating member 110 are thermally connected via the heat transfer material, so that the member and the joining process can be reduced and the thermal resistance can be reduced.

When the lead and the module heat radiating member 110 have the same potential, they may be connected by a conductive member such as solder, or the lead bonded to the power semiconductor element is mechanically connected to the module heat radiating member 110 by a spring or a screw or the like. May be pressed. By changing from joining to mechanical pressing, thermal resistance is reduced, deterioration at temperature cycles and high temperatures is reduced, and long-term reliability is improved. Further, the module heat radiating member 110 may be modularized integrally with the power module 160.

The power module 160 includes a sealing resin 165. The sealing resin 165 seals a power semiconductor element, a positive electrode side connecting member 161, a negative electrode side connecting member 162, a winding connecting member 163, a control connecting member 164, and other components. The sealing resin 165 includes, for example, a potting resin such as an epoxy resin, a silicone resin, and a urethane resin, a coating material on the surface of a power semiconductor element such as a fluorine resin, polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), and poly Molding materials such as ether etherketone (PEEK) and acrylonitrile butadiene styrene (ABS) are used. By covering the components such as power semiconductor elements with the sealing resin 165, it is possible to ensure the insulating property even when foreign matter is mixed in or water containing salt, mud or the like is splashed. Further, by using a material having high hardness such as epoxy resin, parts can be fixed and vibration resistance can be improved. The sealing resin 165 may be omitted as long as the power module 160 can be insulated and fixed by a method other than the sealing resin 165.

<Arrangement configuration of module heat dissipation member 110>
The power module 160 and the module heat radiating member 110 are arranged in a space between the rear bracket 2 and the control circuit 170 (circuit board 103) in the axial direction Z. The heat radiating member fixing surface 16 of the power module 160 extends in the radial direction Y and the axial direction Z. In the refrigerant flow path 180, air as a refrigerant flows in the radial direction Y in the arrangement space of the module heat radiating member 110. The refrigerant may be a medium other than air (for example, cooling water).

According to this configuration, the heat radiating member fixing surface 16 of the power module 160 extends in the radial direction Y and the axial direction Z, and the module heat radiating member 110 is one side or the other side of the circumferential direction X of the heat radiating member fixing surface 16. Is placed in. Therefore, it is possible to suppress the extension of the power module 160 and the module heat radiating member 110 in the circumferential direction X, and it is possible to suppress an increase in the arrangement area of the power module 160 and the module heat radiating member 110 in the circumferential direction X. Therefore, it is possible to prevent the outer diameter of the power supply unit 300 from expanding by mounting the power module 160 and the module heat radiating member 110.

The module heat radiating member 110 is arranged on one side or the other side of the heat radiating member fixing surface 16 in the circumferential direction X. Then, in the arrangement space of the module heat dissipation member 110, the refrigerant flow path 180 through which the refrigerant flows in the radial direction Y is provided, so that between the rear side bracket 2 arranged at intervals in the axial direction Z and the circuit board 103. The refrigerant flow path 180 can be provided by utilizing the space. Therefore, it is not necessary to reduce the arrangement area of the circuit board 103 in order to allow the refrigerant to flow to the rear side Z2 of the power module 160.

In the present embodiment, the heat radiating member fixing surface 16 is a flat surface, and extends along a flat surface passing through the axis C. The heat radiating member fixing surface 16 may have irregularities or curved surfaces as long as it extends in the radial direction Y and the axial direction Z. Further, the heat radiating member fixing surface 16 may be inclined at an angle of, for example, within 30 degrees with respect to a plane passing through the axis C and intersecting the heat radiating member fixing surface 16.

In the present embodiment, the power module 160 is formed in a rectangular parallelepiped shape, and each connecting member 161 to 164 projects from the rectangular parallelepiped main body portion. The heat radiating member fixing surface 16 is one surface of a rectangular parallelepiped. Each side of the rectangular parallelepiped is arranged so as to be parallel or orthogonal to the axial direction Z. The width of the power module 160 in the circumferential direction X is shorter than the width in the radial direction Y and the width in the axial direction Z. It should be noted that each side of the rectangular parallelepiped may be arranged at an angle without being parallel or orthogonal to the axial direction Z. Further, the power module 160 may be formed in a shape other than the rectangular parallelepiped shape.

The control connecting member 164 projects from the surface of the rear side Z2 of the power module 160 to the rear side Z2, and is connected to the circuit board 103 arranged on the rear side Z2 of the power module 160. FIG. 2 shows one control connecting member 164 as a representative. The positive electrode side connecting member 161, the negative electrode side connecting member 162, and the winding connecting member 163 project from the surface of the power module 160 opposite to the heat radiating member fixing surface 16.

The module heat radiating member 110 is thermally connected to the heat radiating member fixing surface 16 of the power module 160. The module heat radiating member 110 is arranged on one side or the other side of the heat radiating member fixing surface 16 in the circumferential direction X. The module heat radiating member 110 has a role of radiating heat generated when a current flows through the power semiconductor element and the conduction path, and heat entering from other parts to the outside. The module heat radiating member 110 is configured by using, for example, a material having a thermal conductivity of 5 W / m · K or more, such as metal such as aluminum, aluminum alloy, copper, and copper alloy, ceramic, and resin.

The module heat radiating member 110 extends in the radial direction Y and the axial direction Z, and is opposite to the plate-shaped base portion 110a that is thermally connected to the heat radiating member fixing surface 16 and the heat radiating member fixing surface 16 from the base portion 110a. It is provided with a plurality of projecting portions 110b projecting to the side. The heat dissipation area can be increased by providing the plurality of projecting portions 110b. In the present embodiment, each of the plurality of projecting portions 110b is formed in a plate shape extending in the circumferential direction X and the radial direction Y at intervals from each other in the axial direction Z. In the present embodiment, the plurality of plate-shaped protrusions 110b are flat plates extending in parallel with the circumferential direction X and the radial direction Y. The plurality of plate-shaped projecting portions 110b may extend in the circumferential direction X and the radial direction Y, with respect to a plane parallel to the circumferential direction X and the radial direction Y (a plane orthogonal to the axial direction Z). For example, it may be tilted at an angle of 30 degrees or less.

The base portion 110a is formed in a rectangular parallelepiped shape having a surface having an area equivalent to that of the heat radiating member fixing surface 16 of the power module 160. The protruding portion 110b is formed in a rectangular flat plate shape. The base portion 110a may be formed in a shape other than a rectangular parallelepiped shape as long as it has a surface fixed to the heat radiating member fixing surface 16, and the protruding portion 110b is formed in a plate shape other than a rectangular flat plate shape. May be done. Further, if the heat dissipation property can be ensured, the module heat dissipation member 110 may not be provided with a plurality of protrusions 110b.

In the present embodiment, as shown in FIG. 5, the power module 160 is arranged so that the heat radiating member fixing surface 16 faces one side of the circumferential direction X. Then, the module heat radiating member 110 is fixed to one side of the heat radiating member fixing surface 16 in the circumferential direction X, and the refrigerant flow path 180 in which air as a refrigerant flows in the radial direction Y on one side of the module heat radiating member 110 in the circumferential direction X. Is formed. In FIG. 5, the right side is one side of the circumferential direction X, and the left side is the other side of the circumferential direction X. The power module 160 may be arranged with the heat radiating member fixing surface 16 facing the other side in the circumferential direction X, or the module heat radiating member 110 may be fixed on the other side of the heat radiating member fixing surface 16 in the circumferential direction X. ..

A cover opening 101c is provided in the portion of the cover 101 on the radial outer side Y2 of the module heat radiating member 110. Therefore, air as a refrigerant can be concentratedly flowed in the arrangement space of the module heat radiating member 110, and the cooling efficiency can be improved. A plurality of cover openings 101c may be provided according to the number of module heat dissipation members 110 and power modules 160.

In the present embodiment, as shown in FIG. 5, the opening area of the cover opening 101c is set to an area corresponding to the arrangement space of the module heat radiating member 110. As shown in FIG. 2, the end faces of the radial outer side Y2 of the module heat dissipation member 110 and the power module 160 are the cover opening so that the gap between the cover opening 101c and the module heat dissipation member 110 and the power module 160 is small. It is arranged closer to the radial position of 101c. Therefore, air can be efficiently flowed to the flow path on one side of the circumferential direction X of the module heat radiating member 110.

As shown in FIG. 2, the control circuit 170 (circuit board 103) is arranged on the rear side Z2 of the arrangement space of the module heat dissipation member 110, and the rear side bracket 2 is arranged on the front side Z1 of the arrangement space of the module heat dissipation member 110. Since they are arranged, the refrigerant can be collected in the arrangement space of the module heat radiating member 110, and the cooling efficiency can be improved.

In the present embodiment, as shown by an arrow in FIG. 2, in the refrigerant flow path 180, air as a refrigerant is sucked from the outside through the cover opening 101c of the cover 101, and then the module heat dissipation member 110 is arranged. It flows through the space in the radial direction Y1. After that, the air flows through the intake opening 21 of the rear side Z2 of the rear side bracket 2 to the front side Z1 and is sucked by the rear side blower fan 82. The air may flow in the opposite direction.

<Arrangement configuration of control circuit cooling mechanism>
As described above, the rotary electric machine 100 includes a control circuit cooling mechanism that cools the control circuit 170 with the refrigerant flowing in the arrangement space of the module heat radiating member 110.

According to this configuration, the control circuit 170 can be cooled by the control circuit cooling mechanism by using the refrigerant flowing in the arrangement space of the module heat radiating member 110. Since it is not necessary to separately supply the refrigerant to the module heat dissipation member 110 and the control circuit cooling mechanism, the flow path pressure loss can be reduced, so that the flow velocity increases and the cooling efficiency of both the module heat dissipation member 110 and the control circuit cooling mechanism is increased. Can be improved. By improving the cooling performance of the power module 160 and the control circuit 170, it is possible to reduce the need to use parts having high heat resistance and reduce the cost of parts. Further, the control circuit cooling mechanism can be arranged on the downstream side of the arrangement space of the module heat radiation member 110, and the width of the entire cooling mechanism with respect to the flow direction of the refrigerant (diameter direction Y in this example) (axis in this example). It is possible to suppress the spread of the direction Z) and the increase in size.

The control circuit cooling mechanism includes a circuit heat radiating member 106 which is arranged on the refrigerant flow path 180 side of the control circuit 170, is thermally connected to the control circuit 170, and is a heat radiating member cooled by the refrigerant. The circuit heat dissipation member 106 has a role of radiating the heat of the control circuit 170 to the outside. The circuit heat radiating member 106 is configured by using, for example, a material having a thermal conductivity of 5 W / m · K or more, such as a metal such as aluminum, an aluminum alloy, copper, or a copper alloy, ceramic, or a resin. The circuit heat dissipation member 106 can efficiently release the heat of the control circuit 170 to the outside by the refrigerant. The portion of the control circuit 170 in which the circuit heat dissipation member 106 is arranged can be particularly cooled, and if the circuit element 105 having a large heat generation amount is arranged in this portion, the cooling efficiency can be improved.

In the present embodiment, as described above, the control circuit 170 (circuit board 103) is arranged at intervals on the rear side Z2 of the rear side bracket 2. The power module 160 and the module heat radiating member 110 are arranged in a space between the rear bracket 2 and the control circuit 170 (circuit board 103) in the axial direction Z. The refrigerant flows in the arrangement space of the module heat radiating member 110 located between the rear side bracket 2 and the control circuit 170 in the axial direction Z. The circuit heat dissipation member 106 projects from the control circuit 170 side (circuit board 103 in this example) to the front side Z1. According to this configuration, the circuit heat radiating member 106 is cooled by the refrigerant flowing between the control circuit 170 and the rear bracket 2 without changing the arrangement of the control circuit 170 arranged on the rear side Z2, and the control circuit 170 is used. Can be cooled.

The circuit heat radiating member 106 projects from the control circuit 170 side (circuit board 103) to the front side Z1 in the radial inner side Y1 of the module heat radiating member 110. According to this configuration, the refrigerant flowing from the arrangement space of the module heat radiating member 110 to the inner side Y1 in the radial direction can be directly applied to the circuit heat radiating member 106, and the module heat radiating member 110 can be efficiently cooled. The module heat radiating member 110 and the circuit heat radiating member 106 can be arranged side by side in the radial direction Y, and the distance between the rear bracket 2 and the control circuit 170 (circuit board 103) is suppressed from widening in the axial direction Z. The size of 100 can be reduced. Further, the circuit heat radiating member 106 can change the direction in which the refrigerant flows from the radial inner side Y1 to the front side Z1, and can supply the refrigerant to the rotary electric machine main body 200 side of the front side Z1.

In the present embodiment, the circuit heat radiating member 106 projects from the control circuit 170 to the front side Z1 to a position overlapping the module heat radiating member 110 when viewed in the radial direction Y. The circuit heat radiating member 106 projects toward the front side Z1 from the central position of the module heat radiating member 110 in the axial direction Z. Further, the circuit heat radiating member 106 has a portion arranged at a radial position of Y1 inside the rear side Z2 of the rear side bracket 2 in the radial direction with respect to the intake opening 21 of the rear side Z2, and the refrigerant is efficiently supplied to the intake opening 21. Can be guided. In this example, the entire circuit heat radiating member 106 is arranged at the radial position of Y1 inside the intake opening 21 in the radial direction. The module heat radiating member 110 is formed in a rectangular parallelepiped shape extending to the front side Z1. The module heat radiating member 110 may be provided with a plurality of protruding members (fins) or may be formed in an arbitrary shape in order to improve the cooling performance.

In the present embodiment, the circuit element 105 is mounted on the surface of the rear side Z2 of the circuit board 103. The front side Z1 side surface of the circuit board 103 may be covered with a protective member such as resin. The circuit element 105 may be mounted on the front side Z1 surface of the circuit board 103. The circuit element 105 is arranged on the opposite side (rear side Z2) of the circuit heat dissipation member 106 with the circuit board 103 interposed therebetween. The circuit element 105 arranged on the opposite side can be efficiently cooled. The circuit element 105 arranged on the opposite side of the circuit heat dissipation member 106 may be a circuit element 105 having a large heat generation amount (for example, a CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit)).

In the present embodiment, the circuit heat dissipation member 106 is fixed to the surface of the front side Z1 of the control circuit 170 (circuit board 103). In the present embodiment, a heat transfer material may be interposed between the circuit heat dissipation member 106 and the control circuit 170 (circuit board 103) in order to reduce the contact thermal resistance. As the heat transfer material, for example, an adhesive, grease, sheet, gel, solder, silver paste or the like is used. The circuit heat dissipation member 106 may be fixed to the control circuit 170 (circuit board 103) by a fixing member such as a screw.

When a plurality of module heat radiating members 110 and power modules 160 are distributed in the circumferential direction, a plurality of circuit heat radiating members 106 may be provided in a circumferential direction corresponding to each module heat radiating member 110.

2. 2. Embodiment 2
Next, the rotary electric machine 100 according to the second embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 6 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

In the present embodiment, a case 102 is provided which covers the refrigerant flow path 180 side (front side Z1 in this example) of the control circuit 170 and is thermally connected to the control circuit 170. The control circuit cooling mechanism includes a circuit heat radiating member 106 which is arranged on the refrigerant flow path 180 side of the case 102, is thermally connected to the case 102, and is a heat radiating member cooled by the refrigerant. Therefore, the circuit heat dissipation member 106 is thermally connected to the control circuit 170 via the case 102.

According to this configuration, the control circuit 170 can be protected by the case 102 from foreign substances contained in the refrigerant, and the heat of the control circuit 170 can be transferred to the circuit heat dissipation member 106 through the case 102 to cool the control circuit 170. it can.

In the present embodiment, the case 102 includes a bottom wall that covers the front side Z1 of the circuit board 103, and a peripheral wall that covers the outer peripheral side of the circuit board 103. The rear side Z2 of the circuit board 103 is covered with the rear side bottom wall 101a of the cover 101.

For the case 102, a material having good heat transfer properties such as resin, aluminum, and aluminum alloy is used. The case 102 is cooled by the refrigerant. That is, the surface of the front side Z1 of the case 102 is cooled by the refrigerant flowing through the front side Z1 of the case 102.

The case 102 is provided with a through hole through which the control connecting member 164 of the power module 160 penetrates. The control connecting member 164 is connected to the circuit board 103.

The power module 160 and the module heat radiating member 110 are arranged in the space between the rear bracket 2 and the case 102 in the axial direction Z. The refrigerant flows in the arrangement space of the module heat radiating member 110 located between the rear side bracket 2 and the case 102 in the axial direction Z.

Similar to the first embodiment, the circuit heat radiating member 106 projects from the control circuit 170 side (case 102 in this example) to the front side Z1. Further, the refrigerant flows in the radial inner Y1 in the arrangement space of the module heat radiating member 110, and the circuit heat radiating member 106 is in the radial inner Y1 of the module heat radiating member 110 from the control circuit 170 side (case 102) to the front side Z1. It protrudes into.

The circuit heat radiating member 106 is fixed to the surface of the case 102 on the front side Z1. A heat transfer material may be interposed between the circuit heat radiating member 106 and the case 102 in order to reduce the contact thermal resistance. As the heat transfer material, for example, an adhesive, grease, sheet, gel, solder, silver paste or the like is used. The circuit heat dissipation member 106 may be fixed to the case 102 (circuit board 103) by a fixing member such as a screw. Alternatively, the circuit heat dissipation member 106 may be integrally formed with the case 102.

The circuit element 105 is mounted on the surface of the circuit board 103 on the rear side Z2. The circuit element 105 is arranged on the opposite side (rear side Z2) of the circuit heat radiating member 106 with the case 102 and the circuit board 103 interposed therebetween. The circuit element 105 can be cooled efficiently. The circuit element 105 arranged on the opposite side of the circuit heat dissipation member 106 may be a circuit element 105 (for example, CPU, ASIC) having a large heat generation amount. Further, since the heat of the circuit element 105 is dispersed in the case 102, the control circuit 170 can be cooled as a whole. The circuit element 105 may be mounted on the front side Z1 surface of the circuit board 103. In this case, the circuit element 105 having a large amount of heat generation may be arranged on the rear side Z2 with the case 102 interposed therebetween.

In the present embodiment, the surface of the front side Z1 of the control circuit 170 is thermally connected to the surface of the rear side Z2 of the case 102. A heat transfer material is interposed between the control circuit 170 and the case 102 in order to reduce the contact thermal resistance. As the heat transfer material, for example, a resin, a sheet, a gel or the like is used. The control circuit 170 may be sealed in the case 102 by a heat-transmitting sealing member such as a sealing resin 165 similar to the power module 160.

3. 3. Embodiment 3
Next, the rotary electric machine 100 according to the third embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 7 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

In this embodiment, a case 102 that covers the refrigerant flow path 180 side (in this example, the front side Z1) of the control circuit 170 is provided. The control circuit cooling mechanism includes a circuit heat radiating member 106 thermally connected to the control circuit 170. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102, protrudes to the refrigerant flow path 180 side (front side Z1 in this example), and is cooled by the refrigerant.

According to this configuration, the control circuit 170 can be protected by the case 102 from foreign substances contained in the refrigerant, and the control circuit 170 can be directly cooled by the circuit heat dissipation member 106 without going through the case 102. , The cooling efficiency of the circuit element 105 arranged in the vicinity of the circuit heat dissipation member 106 can be improved.

Similar to the second embodiment, the case 102 includes a bottom wall that covers the front side Z1 of the circuit board 103, and a peripheral wall that covers the outer peripheral side of the circuit board 103. The rear side Z2 of the circuit board 103 is covered with the rear side bottom wall 101a of the cover 101.

A material such as resin, aluminum, or aluminum alloy is used for the case 102. The case 102 is provided with a through hole through which the control connecting member 164 of the power module 160 penetrates. The control connecting member 164 is connected to the circuit board 103.

The power module 160 and the module heat radiating member 110 are arranged in the space between the rear bracket 2 and the case 102 in the axial direction Z. The refrigerant flows in the arrangement space of the module heat radiating member 110 located between the rear side bracket 2 and the case 102 in the axial direction Z.

The circuit heat radiating member 106 penetrates the through hole 102a of the case 102 and projects from the control circuit 170 side (circuit board 103 in this example) to the front side Z1. Further, the refrigerant flows in the radial inner Y1 in the arrangement space of the module heat radiating member 110, and the circuit heat radiating member 106 is on the control circuit 170 side (through hole 102a of the case 102) in the radial inner Y1 of the module heat radiating member 110. It protrudes from the front side Z1.

Similar to the first embodiment, the circuit heat dissipation member 106 is fixed to the surface of the circuit board 103 on the front side Z1. The circuit element 105 is arranged on the opposite side (rear side Z2) of the circuit heat dissipation member 106 with the circuit board 103 interposed therebetween. The circuit element 105 can be cooled efficiently. The circuit element arranged on the opposite side of the circuit heat dissipation member 106 may be a circuit element 105 (for example, CPU, ASIC) having a large heat generation amount. The circuit element 105 may be mounted on the front side Z1 surface of the circuit board 103.

In the present embodiment, the surface of the front side Z1 of the control circuit 170 and the surface of the rear side Z2 of the case 102 are arranged with a gap. As in the second embodiment, the surface of the front side Z1 of the control circuit 170 and the surface of the rear side Z2 of the case 102 may be thermally connected via the heat transfer material.

4. Embodiment 4
Next, the rotary electric machine 100 according to the fourth embodiment will be described. The same components as those in the first or third embodiment will not be described. FIG. 8 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

Similar to the third embodiment, a case 102 that covers the control circuit 170 is provided. The control circuit cooling mechanism includes a circuit heat radiating member 106 thermally connected to the control circuit 170. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102, projects to the refrigerant flow path 180 side (front side Z1 in this example), and is cooled by the refrigerant.

Similar to the first and third embodiments, the circuit element 105 is arranged on the opposite side (rear side Z2) of the circuit heat radiating member 106 with the circuit board 103 interposed therebetween. In the present embodiment, a through hole 107 penetrating the circuit board 103 is provided in the portion of the circuit board 103 sandwiched between the circuit heat dissipation member 106 and the circuit element 105. The through hole 107 may be filled with a metal material. By providing the through hole 107, the heat conduction from the circuit element 105 to the circuit heat dissipation member 106 can be enhanced, and the circuit element 105 can be cooled more efficiently.

5. Embodiment 5
Next, the rotary electric machine 100 according to the fifth embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 9 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

Similar to the third embodiment, the case 102 that covers the refrigerant flow path 180 side (in this example, the front side Z1) of the control circuit 170 is provided. Similar to the second embodiment, the control circuit cooling mechanism is a heat radiating member that is arranged on the refrigerant flow path 180 side (front side Z1) of the case 102, is thermally connected to the case 102, and is cooled by the refrigerant. The circuit heat dissipation member 106 is provided.

In the present embodiment, the circuit element 105 is arranged on the refrigerant flow path 180 side (in this example, the front side Z1) of the circuit board 103. A circuit element 105a is arranged on the opposite side (rear side Z2) of the circuit heat radiating member 106 with the case 102 interposed therebetween, and the circuit element 105a arranged on the opposite side is thermally connected to the case 102. The circuit heat radiating member 106 can efficiently cool the circuit element 105a.

Further, another circuit element 105b arranged on the front side Z1 of the circuit board 103 is provided with a circuit heat dissipation member 106. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102, projects to the refrigerant flow path 180 side (front side Z1 in this example), and is cooled by the refrigerant. In the present embodiment, the circuit heat radiating member 106 is integrally configured with the circuit element 105b. The circuit heat dissipation member 106 may be separated from the circuit element 105b. According to this configuration, the heat of the circuit element 105b can be directly cooled by the circuit heat radiating member 106 protruding toward the refrigerant flow path 180.

6. Embodiment 6
Next, the rotary electric machine 100 according to the sixth embodiment will be described. Description of the same components as in the first embodiment will be omitted. 10 and 11 are schematic cross-sectional views of the rotary electric machine 100 according to the present embodiment cut along a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

Similar to the third embodiment, the case 102 that covers the refrigerant flow path 180 side (in this example, the front side Z1) of the control circuit 170 is provided. The control circuit cooling mechanism includes a circuit heat radiating member 106 thermally connected to the control circuit 170. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102, protrudes to the refrigerant flow path 180 side (front side Z1 in this example), and is cooled by the refrigerant.

In the present embodiment, the circuit element 105 is arranged on the rear side Z2 of the circuit board 103. The circuit heat radiating member 106 penetrates the circuit board 103 and is thermally connected to the circuit element 105 arranged on the rear side Z2 without passing through the circuit board 103.

One circuit heat radiating member 106a projects from the control circuit 170 side to the front side Z1 in the radial inner side Y1 of the module heat radiating member 110. Another circuit heat radiating member 106b projects from the control circuit 170 side to the front side Z1 in the space of the rear side Z2 of the module heat radiating member 110.

In the present embodiment, the protrusion height of the circuit heat radiating member 106 to the front side Z1 is low, and the circuit heat radiating member 106 does not overlap with the module heat radiating member 110 when viewed in the radial direction Y. A guide member 108 is provided that guides the refrigerant that has flowed in the radial inner Y1 in the arrangement space of the module heat radiating member 110 to the rear side Z2 and supplies it to the circuit heat radiating member 106. The guide member 108 extends in the combined direction of the rear side Z2 and the radial inner Y1.

According to this configuration, even when the protruding height of the circuit heat radiating member 106 is low and the circuit heat radiating member 106 is not arranged on the radial inner side Y1 of the module heat radiating member 110, the guiding member 108 causes the refrigerant to move to the rear side Z2. It can be guided, supplied to the circuit heat dissipation member 106, and cooled. As a result, the degree of freedom in arranging the circuit element 105 on the circuit board 103 is created, and the control circuit 170 can be miniaturized.

The guide member 108 may be a plate-shaped member extending in the circumferential direction X as well. The area of the guiding member 108 can be increased, and the flow rate of the induced refrigerant can be increased.

In the example shown in FIG. 10, the guide member 108 is provided on the module heat dissipation member 110. In this case, the surface area of the module heat radiating member 110 can be increased by the amount of the guiding member 108, and the cooling efficiency of the power module 160 can be improved. The guide member 108 may be provided on the circuit heat dissipation member 106.

In the example shown in FIG. 11, the guiding member 108 is provided in the case 102. In this case, the guide member 108 can be formed of the same material as the case 102 to reduce the weight. The guide member 108 can be integrally formed with the case 102 to reduce the number of parts.

The guide member 108 may be separate from the module heat dissipation member 110 and the case 102. In this case, the guide member 108 is fixed to another member by screwing or the like. Further, the degree of freedom in arranging the guide member 108 can be increased, and the guide member 108 can be arranged at an appropriate position and in an appropriate size.

7. Embodiment 7
Next, the rotary electric machine 100 according to the seventh embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 12 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat radiation member 110 and the rotary shaft 4.

Similar to the third embodiment, the case 102 that covers the refrigerant flow path 180 side (in this example, the front side Z1) of the control circuit 170 is provided. The control circuit cooling mechanism includes a circuit heat radiating member 106 thermally connected to the control circuit 170. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102, protrudes to the refrigerant flow path 180 side (front side Z1 in this example), and is cooled by the refrigerant.

Similar to the sixth embodiment, the circuit element 105 is arranged on the rear side Z2 of the circuit board 103. The circuit heat radiating member 106 penetrates the circuit board 103 and is thermally connected to the circuit element 105 arranged on the rear side Z2 without passing through the circuit board 103.

One circuit heat radiating member 106a projects from the control circuit 170 side to the front side Z1 in the radial inner side Y1 of the module heat radiating member 110. Another circuit heat radiating member 106b projects from the control circuit 170 side to the front side Z1 in the space of the rear side Z2 of the module heat radiating member 110.

Similar to the sixth embodiment, the protrusion height of the circuit heat radiating member 106 to the front side Z1 is low, and the circuit heat radiating member 106 does not overlap with the module heat radiating member 110 in the radial direction Y. It is provided with an induction member that guides the refrigerant that has flowed in the radial inner Y1 in the arrangement space of the module heat dissipation member 110 to the rear side Z2 and supplies it to the circuit heat dissipation member 106. The guide member extends in the combined direction of the rear side Z2 and the radial inner Y1.

In the present embodiment, the connecting member of the power module 160 protruding outward constitutes the guiding member. As shown in FIG. 12, the shape of the control connecting member 164 that connects the power semiconductor element and the control circuit 170 is different from that of the first embodiment, and the control connecting member 164 constitutes the guiding member. .. The control connecting member 164 extends obliquely from the main body (sealing resin 165) of the power module 160 in the combined direction of the rear side Z2 and the radial inner Y1 and then extends to the rear side Z2. The obliquely extending portion can guide the refrigerant flowing near the arrangement space of the module heat radiating member 110 to the rear side Z2, and can supply the refrigerant to the circuit heat radiating member 106a arranged ahead of the rear side Z2. Since the control connecting member 164 is an guiding member, the cooling performance of the control circuit 170 can be improved without increasing the number of parts. Although one control connecting member 164 is shown as a representative in FIG. 12, the other control connecting member 164 may have a shape as shown in the drawing or may have another shape. You may. Further, a plurality of control connecting members 164 having a shape as shown in the drawing may be arranged at intervals in the circumferential direction X.

As shown in FIG. 12, the shape of the positive electrode side connecting member 161 for connecting the power semiconductor element to the positive electrode side power supply terminal 151 side is different from that of the first embodiment, and the positive electrode side connecting member 161 constitutes the guiding member. ing. The positive electrode side connecting member 161 extends obliquely from the main body of the power module 160 in the combined direction of the rear side Z2 and the radial inner Y1. The obliquely extending portion can guide the refrigerant flowing near the arrangement space of the module heat radiating member 110 to the rear side Z2, and can supply the refrigerant to the circuit heat radiating member 106b arranged ahead of the rear side Z2. The sealing resin 165 also extends diagonally from the main body in the composite direction of the rear side Z2 and the radial inner Y1. Since the positive electrode side connecting member 161 is used as the guiding member, the cooling performance of the control circuit 170 can be improved without increasing the number of parts. Although FIG. 12 shows the positive electrode side connecting member 161, the guiding member 108 may be one or both of the positive electrode side connecting member 161 and the negative electrode side connecting member 162.

8. Embodiment 8
Next, the rotary electric machine 100 according to the eighth embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 13 is a schematic cross-sectional view of the rotary electric machine 100 according to the present embodiment cut by a plane passing through the axis C of the module heat dissipation member 110 and the rotary shaft 4.

Similar to the third embodiment, the case 102 that covers the refrigerant flow path 180 side (in this example, the front side Z1) of the control circuit 170 is provided. The control circuit cooling mechanism includes a circuit heat radiating member 106 thermally connected to the control circuit 170. The circuit heat radiating member 106 penetrates the through hole 102a provided in the case 102 and projects to the refrigerant flow path 180 side (in this example, the front side Z1).

The circuit heat radiating member 106 projects from the control circuit 170 side to the front side Z1 in the space of the rear side Z2 of the module heat radiating member 110. The module heat radiating member 110 is formed with an induction flow path 112 for flowing a refrigerant in the combined direction of the rear side Z2 and the radial inner Y1.

Through holes (or notches) are formed in each of the plurality of plate-shaped protrusions 110b (fins) arranged at intervals in the axial direction Z along the combined direction of the rear side Z2 and the radial inner Y1. The through hole forms the guide flow path 112. The circuit heat dissipation member 106 is arranged ahead of the synthesis direction in which the through hole is formed. Alternatively, a through hole extending in the combined direction of the rear side Z2 and the radial inner Y1 may be formed in the base portion 110a. The induction flow path 112 may be formed at an arbitrary position according to the arrangement position of the circuit heat dissipation member 106. Since the induction flow path 112 is formed in the module heat radiating member 110, the cooling performance of the control circuit 170 can be improved without increasing the number of parts. Even when the circuit heat radiating member 106 is arranged on the rear side Z2 of the module heat radiating member 110, the refrigerant can be supplied. In addition, the degree of freedom in arranging the circuit element 105 on the circuit board 103 is created, and the control circuit 170 can be miniaturized.

9. Embodiment 9
Next, the rotary electric machine 100 according to the ninth embodiment will be described. Description of the same components as in the first embodiment will be omitted. FIG. 14 is a perspective view of two paired power modules 160 and a module heat radiating member 110 according to the present embodiment.

In the present embodiment, the two power modules 160 are arranged so that the heat radiating member fixing surfaces 16 face each other in the circumferential direction X. One or more module heat radiating members 110 are arranged between the two power modules 160, and a refrigerant flow path 180 through which the refrigerant flows in the radial direction is formed. In the present embodiment, two module heat radiating members 110 are arranged between the two power modules 160, and one module heat radiating member 110 is thermally arranged on each of the heat radiating member fixing surfaces 16 of the two power modules 160. The space between the two module heat radiating members 110 is a refrigerant flow path 180 through which the refrigerant flows in the radial direction Y.

According to this configuration, the two power modules 160 can share and integrate the refrigerant flow path 180 through which the refrigerant flows. Further, since the two power modules 160 can be arranged close to each other in the circumferential direction X, the arrangement area of the power module 160 and the module heat radiating member 110 in the circumferential direction X can be reduced, and the power supply unit 300 can be miniaturized. Since the two power modules 160 are arranged side by side in the circumferential direction X, the control circuit 170 can be arranged on the rear side Z2 of each power module 160, and the control connecting member 164 from each power module 160 is placed on the rear side Z2. It can be extended and connected to the control circuit 170.

The ends of the front side Z1 of the two module heat radiating members 110 are fixed to each other by the fixing member 113. The ends of the rear side Z2 of the two module heat radiating members 110 may also be fixed to each other by the fixing member. The fixing member 113 can improve the mutual arrangement accuracy of the two power modules 160 and the module heat radiating member 110. The fixing member 113 may be made of a resin material such as polybutylene terephthalate (PBT), polyphenylene terephthalate (PPS), or etheretherketone (PEEK), or a pure metal such as iron, aluminum, or copper. , Or it may be composed of an alloy made of iron, aluminum, copper or the like. Each fixing member 113 is fixed to the module heat radiating member 110 by, for example, screwing, bonding, caulking, welding, or the like.

Further, when the fixing member 113 is made of a material having a high thermal conductivity, for example, a thermal conductivity of 5 W / m2 · K or more, the temperatures of the two module heat radiating members 110 facing each other can be equalized. it can. Since the power module 160 operates at different timings and the energization timing is different, the temperature of the power semiconductor element mounted on the power module 160 may vary, and the temperature of the module heat dissipation member 110 may vary. Can be suppressed.

Also in this embodiment, the module heat radiating member 110 arranged between the two power modules 160 is formed with an induction flow path for flowing the refrigerant in the combined direction of the rear side Z2 and the radial inner side Y1. In this example, the fixing member 113 is formed with a through hole 112 penetrating from the refrigerant flow path 180 between the two module heat dissipation members 110 to the rear side Z2, and the through hole 112 serves as an induction flow path. ing. The refrigerant flows from the through hole 112 in the synthesis direction of the rear side Z2 and the radial inner Y1. The circuit heat dissipation member 106 is arranged ahead of the direction in which the refrigerant flows. An induction flow path (through hole 112) may be formed at an arbitrary position according to the arrangement position of the circuit heat dissipation member 106.

Since the induction flow path is formed in the module heat radiating member 110, the cooling performance of the control circuit 170 can be improved without increasing the number of parts. Even when the circuit heat radiating member 106 is arranged on the rear side Z2 of the module heat radiating member 110, the refrigerant can be supplied. In addition, the degree of freedom in arranging the circuit element 105 on the circuit board 103 is created, and the control circuit 170 can be miniaturized.

The fixing member 113 may not be provided. Each of the two module heat radiating members 110 facing each other may be formed with a through hole as an induction flow path extending in the combined direction of the rear side Z2 and the radial inner Y1 as in the eighth embodiment. Alternatively, one module heat radiating member 110 may be arranged between the two power modules 160, and the refrigerant flow path 180 of the refrigerant penetrating in the radial direction Y may be formed in one module heat radiating member 110. In this case, a through hole as an induction flow path through the one module heat radiating member 110 from the refrigerant flow path 180 penetrating in the radial direction Y to the rear side Z2 or the rear side Z2 and the radial inner side Y1 in the combined direction. May be provided.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Front side bracket, 2 Rear side bracket, 3 Stator, 4 Rotating shaft, 6 Rotor, 16 Heat dissipation member fixing surface, 32 windings, 100 rotating electric machine, 101 cover, 101c cover opening, 102 case, 103 circuit board , 105 circuit element, 106 circuit heat dissipation member, 107 through hole, 108 induction member, 110 module heat dissipation member, 112 induction flow path, 160 power module, 161 positive side connection member, 164 control connection member, 170 control circuit, 180 refrigerant. Flow path, 200 rotary electric machine main body, 300 power supply unit, C axis, X circumferential direction, Y radial direction, Y1 radial inside, Z axis direction, Z1 front side (one side in the axial direction), Z2 rear side ( The other side in the axial direction)

Claims (20)

Stator with multi-phase winding and
A rotor arranged radially inside the stator and
A rotating shaft that rotates integrally with the rotor,
A bracket that accommodates the stator and the rotor and rotatably supports the rotating shaft.
A power module provided with a power semiconductor element that turns on and off the energization of the winding, and
A module heat radiating member which is a heat radiating member thermally connected to the power module,
A control circuit that controls the power semiconductor element and
At least the refrigerant flow path through which the refrigerant flows in the arrangement space of the module heat dissipation member,
A rotary electric machine including a control circuit cooling mechanism that cools the control circuit by a refrigerant flowing in the arrangement space of the module heat radiating member. The first aspect of the present invention includes a circuit heat radiating member which is arranged on the refrigerant flow path side of the control circuit, is thermally connected to the control circuit, and is a heat radiating member cooled by the refrigerant. The rotating electric machine described. A case is provided which covers the refrigerant flow path side of the control circuit and is thermally connected to the control circuit.
The first aspect of the present invention, wherein the control circuit cooling mechanism includes a circuit heat radiating member which is arranged on the refrigerant flow path side of the case, is thermally connected to the case, and is a heat radiating member cooled by the refrigerant. Rotating electric machine. A case for covering the refrigerant flow path side of the control circuit is provided.
The control circuit cooling mechanism includes a circuit heat radiating member which is a heat radiating member thermally connected to the control circuit.
The rotary electric machine according to claim 1, wherein the circuit heat radiating member penetrates a through hole provided in the case from the control circuit side, projects to the refrigerant flow path side, and is cooled by the refrigerant. The control circuit includes a circuit element and a circuit board on which the circuit element is mounted.
The circuit heat dissipation member is thermally connected to the circuit board.
The rotary electric machine according to claim 2 or 4, wherein the circuit element is arranged on the opposite side of the circuit heat dissipation member across the circuit board. The rotary electric machine according to claim 5, wherein a through hole penetrating the circuit board is provided in a portion of the circuit board sandwiched between the circuit heat dissipation member and the circuit element. A case for covering the refrigerant flow path side of the control circuit is provided.
The control circuit includes a circuit element and a circuit board on which the circuit element is mounted.
The circuit element is arranged on the refrigerant flow path side of the circuit board.
The rotary electric machine according to claim 1, wherein the circuit element penetrates a through hole provided in the case, projects toward the refrigerant flow path side, and is provided with a circuit heat radiating member that is cooled by the refrigerant. The control circuits are spaced apart from each other on the other side of the bracket in the axial direction.
The power module and the module heat radiating member are arranged in a space between the bracket and the control circuit in the axial direction.
The refrigerant flows in the arrangement space of the module heat radiating member located between the bracket and the control circuit in the axial direction.
The rotary electric machine according to any one of claims 2 to 7, wherein the circuit heat radiating member projects from the control circuit side to one side in the axial direction. The refrigerant flows inward in the radial direction in the arrangement space of the module heat radiating member,
The rotary electric machine according to claim 8, wherein the circuit heat radiating member protrudes from the control circuit side to one side in the axial direction inside the module heat radiating member in the radial direction. The rotary electric machine according to claim 8 or 9, wherein the circuit heat radiating member projects from the control circuit side to one side in the axial direction in a space on the other side in the axial direction of the module heat radiating member. The refrigerant flowing inward in the radial direction in the arrangement space of the module heat radiating member is guided to the other side in the axial direction and supplied to the circuit heat radiating member, and is extended in the other side in the axial direction and in the radial direction. The rotary electric machine according to any one of claims 8 to 10, further comprising a member. The rotary electric machine according to claim 11, wherein the induction member is provided on the module heat dissipation member. The rotary electric machine according to claim 11, further comprising a case that covers one side of the control circuit in the axial direction, and the guiding member is provided in the case. The rotary electric machine according to claim 11, wherein the power module includes a connecting member protruding outward, and the connecting member constitutes the guiding member. The rotary electric machine according to claim 14, wherein the connecting member constituting the guiding member is a connecting member for connecting the power module to the DC power supply side. The rotary electric machine according to claim 14 or 15, wherein the connecting member constituting the guiding member is a connecting member for connecting the power module to the control circuit. The rotary electric machine according to any one of claims 8 to 16, wherein an induction flow path for flowing a refrigerant is formed in the module heat radiating member in the other side in the axial direction and in the combined direction inside the radial direction. A case that covers the control circuit and is thermally connected to the control circuit is provided.
The rotary electric machine according to any one of claims 1 to 17, wherein the case is cooled by a refrigerant. Further provided with a cover covering the power module and the control circuit
The rotary electric machine according to any one of claims 1 to 18, wherein the cover is provided with an opening through which the refrigerant flows in a portion outside the radial direction of the module heat radiating member. The fixed surface of the power module to which the module heat radiating member is thermally connected extends in the radial direction and the axial direction, and the refrigerant flows in the radial direction in the arrangement space of the module heat radiating member according to claims 1 to 19. The rotary electric machine according to any one item.

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