JP7371705B2 - rotating machine - Google Patents

Description

The present invention relates to rotating machines such as motors.

Conventionally, there has been provided a rotating machine housing that accommodates a rotor and a stator, an electrical housing that accommodates electrical components, an electrical component cover that closes an opening of the electrical component housing, and an electrical component that flows a refrigerant to cool the electrical components in the electrical component housing or the electrical component cover. A rotating machine equipped with a refrigerant flow path is known.

For example, a motor as a rotating machine described in Patent Document 1 includes a frame as a rotating machine housing, a first casing as an electrical equipment housing, a cover as an electrical equipment cover, and a second coolant passage as a refrigerant flow path for the electrical equipment. Be prepared. The frame accommodates a rotor, which is a rotor, and a stator, which is a stator. The first housing accommodates a semiconductor switching element as an electrical component, and is adjacent to the rotating machine housing on one side and the other side in an axial direction parallel to the rotational axis of the stator. . Further, the first housing includes an opening facing the other side at the other end in the axial direction. The cover is fixed to the first housing so as to close the aforementioned opening of the first housing. The second cooling liquid path is made of a pipe material and is arranged within the first housing in a manner that it contacts the semiconductor switching element. A coolant, which is a refrigerant, flows in the second coolant path.

According to the motor having such a configuration, the semiconductor switching element, which generates heat as it is driven, can be cooled by the coolant in the second coolant path that comes into contact with the semiconductor switching element.

Japanese Patent Application Publication No. 2011-147253

However, in recent years, as motors have become faster and more torquey, the amount of heat generated by electrical components such as semiconductor switching elements has tended to increase.Therefore, there is a need to cool electrical components more efficiently. It will be done.

The present invention has been made in view of the above background, and an object of the present invention is to provide a rotating machine that can cool electrical components more efficiently than before.

In order to achieve the above object, one aspect of the present invention includes a rotating machine housing that accommodates a rotor and a stator, and one side in an axial direction that accommodates electrical components and is parallel to the rotational axis of the rotor. an electrical equipment housing adjacent to the rotary machine housing on the other side; an electrical equipment cover that closes an opening facing the other side at the other axial end of the electrical equipment housing; and the electrical equipment housing or the electrical equipment. A rotating machine that flows a refrigerant for cooling the electrical components in the cover, and includes an electrical component refrigerant flow path in which at least a part of the flow direction of the refrigerant is arranged in the electrical component housing, the electrical component constitutes at least a portion of the wall, the internal refrigerant directly contacts the electrical component in at least the portion of the electrical component refrigerant flow path, and the electrical component housing is connected to the internal space of the rotating machine housing. A partition wall partitions the electrical equipment housing from an internal space, the partition wall includes a plurality of ribs on one side in the axial direction for reinforcing the partition wall, and the plurality of ribs are arranged along the axis of rotation. The ribs are arranged in such a manner that the ribs extend along a radial direction centered at , a groove extending in the radial direction is formed, the groove constitutes a part of a refrigerant flow path for a rotating machine , and guides the refrigerant from the outside to the inside in the radial direction.
Another aspect of the present invention is a rotating machine housing that accommodates a rotor and a stator, and a rotating machine housing that accommodates electrical components and has one side and the other side in an axial direction that is parallel to the rotational axis of the rotor. , an electrical equipment housing adjacent to the rotary machine housing on the other side; an electrical equipment cover that closes an opening facing the other side at the other axial end of the electrical equipment housing; and electrical components in the electrical equipment housing or the electrical equipment cover. A rotating machine that flows a refrigerant for cooling the electrical equipment, and at least a part of the refrigerant flow direction is provided with an electrical equipment refrigerant flow path disposed within the electrical equipment housing, the electrical equipment part being at least one of the electrical equipment housings. The internal refrigerant directly contacts the electrical component in at least a portion of the electrical component refrigerant flow path, and the electrical component housing is configured to form a wall between the internal space of the rotating machine housing and the interior of the electrical component housing. The present invention is characterized in that it includes a partition wall that partitions the vehicle from a space, the partition wall includes a sensor casing that accommodates a rotation detection sensor, and the sensor casing is provided with the refrigerant flow path for the electrical equipment.

According to the present invention, there is an excellent effect that electrical components can be cooled more efficiently than before.

1 is a diagram schematically showing the internal structure of a motor according to an embodiment. It is a side view showing a motor cover, a motor housing, an electrical equipment housing, an electrical equipment cover, and a shaft of the same motor. FIG. 2 is an exploded perspective view showing the electrical equipment housing from the rear side in the axial direction. FIG. 2 is an exploded perspective view showing the electrical housing, cover/casing unit, and switching unit of the motor from the rear side in the axial direction. It is a perspective view showing the same switching unit. FIG. 3 is a sectional view showing the electrical equipment housing. FIG. 2 is a plan view showing the electrical equipment housing and drive shaft from the rear side in the axial direction. FIG. 3 is a longitudinal cross-sectional view showing the motor housing, rotor, stator, and motor shaft of the same motor. FIG. 3 is a plan view showing the electrical equipment housing from the front side in the axial direction.

Embodiments of the present invention will be described below with reference to the drawings.
In the embodiments, structures and elements other than the main parts of the present invention will be simplified or omitted in order to make the description easier to understand. Furthermore, in the drawings, the same elements are given the same reference numerals. Note that the shapes, dimensions, etc. of each element shown in the drawings are shown schematically, and do not represent actual shapes, dimensions, etc.

FIG. 1 is a diagram schematically showing the internal structure of a motor 1 according to an embodiment. FIG. 2 is a side view showing the motor cover 75, motor housing 10, electrical equipment housing 113, electrical equipment cover 70, and motor shaft 6 of the motor 1. As shown in FIG.

As shown in FIGS. 1 and 2, the motor 1 includes a motor cover 75, a motor housing 10, an electrical equipment housing 113, an electrical equipment cover 70, and a motor shaft 6. The motor housing 10 includes a rotatable rotor 2, a stator 3 that accommodates the rotor 2 in its own hollow space, and a motor that penetrates the rotor 2 and rotates integrally with the rotor 2 so as to be located on the rotation axis Ax. The shaft 6 is accommodated in its own internal space.

The motor cover 75, the motor housing 10, the electrical equipment housing 113, and the electrical equipment cover 70 constitute the housing 105 as a whole.

Hereinafter, the direction along the rotational axis Ax of the rotor 2 and the direction parallel thereto will be referred to as the axial direction. In addition, in the axial direction, the motor cover 75 side (load side), which will be described later, is referred to as a front side (one side), and the motor cover 75 side (counter-load side) is referred to as a rear side (other side). The front side is an example of one side in the present invention, and the rear side is an example of the other side in the present invention.

The motor housing 10 includes an opening facing the front side at the front end in the axial direction, and an opening facing the rear side at the rear end in the axial direction. Among these openings, the front opening is closed by a motor cover 75. Further, the opening on the rear side is closed by the electrical equipment housing 113.

A coil (not shown) is wound around the stator 3 . Further, a permanent magnet (not shown) is arranged in the rotor core of the rotor 2. The motor 1 is an inner rotor type motor, and a stator 3 is arranged around the outer periphery of the rotor 2 with a slight air gap therebetween. In the motor housing 10, the magnetic field of the stator 3 is sequentially switched by current control of the coils, so that the rotor 2 rotates around the motor shaft 6 due to an attractive force or a repulsive force with the magnetic field of the rotor 2. The front side of the motor shaft 6 in the axial direction is rotatably supported by a bearing 5, and the rear side is rotatably supported by a bearing 4.

The electrical equipment housing 113 is fixed to the motor housing 10 in a state adjacent to the rear end of the motor housing 10 in the axial direction. Various electrical components for controlling the rotational drive of the motor shaft 6 and the rotor 2 are arranged within the electrical component housing 113. Various electrical components include semiconductor switching elements (IGBT, etc.), gate substrates, capacitors, discharge resistors, control substrates, and the like. These electrical components have the function of converting the DC voltage from the battery (not shown) into AC and supplying it to the coil of the stator 3 during power running, and converting the AC from the coil of the stator 3 into DC to the battery during regeneration. take charge

The electrical equipment housing 113 includes an opening 12 facing the rear side at the rear end in the axial direction. The opening 12 is covered by an electrical equipment cover 70.

The housing 105 includes a motor cover 75, a motor housing 10, an electrical equipment housing 113, and an electrical equipment cover 70, and is attached to the body (not shown) of an electric vehicle. Each of the motor cover 75, the motor housing 10, the electrical equipment housing 113, and the electrical equipment cover 70 is a cast product made of a conductive metal such as an aluminum alloy, and all have electrical conductivity. Therefore, the casing 105 is electrically connected to the vehicle body via a mounting portion (not shown) to the vehicle body, and has the same ground potential as the vehicle body. Note that, if necessary, the housing 105 and the vehicle body may be electrically connected through a ground wire.

The electrical equipment housing 113 serves both as a part of the rotating machine housing and as an electrical equipment housing. More specifically, the axial front end of the electrical equipment housing 113 forms an axial rear internal space 113t in the rotating machine housing. Further, the rear side of the electrical equipment housing 113 in the axial direction is provided with an internal space 113u that accommodates electrical components. The former internal space 113t and the latter internal space 113u are partitioned by a partition wall 113a.

FIG. 3 is an exploded perspective view showing the electrical equipment housing 113 from the rear side in the axial direction. The electrical equipment housing 113 includes a sensor casing 113b integrally molded with a partition wall 113a. In other words, the sensor casing 113b is a part of the partition wall 113a. The axial rear end of the sensor casing 113b protrudes rearward a little more than the axial rear end surface of the partition wall 113a. The sensor housing casing 113b is integrally formed with the partition wall 113a. The rear end of the sensor casing 113b in the axial direction is open toward the rear side. The peripheral wall of the sensor casing 113b projects into the motor space in an embossed manner. A rotation detection sensor 130 such as a resolver is housed in the sensor casing 113b. A motor shaft (6 in FIG. 1) is inserted into the central through hole of the rotation detection sensor 130. The rotation detection sensor 130 indirectly detects the rotation of the rotor (2 in FIG. 1) that rotates integrally with the motor shaft by detecting the rotation of the motor shaft (6 in FIG. 1).

A cover/casing unit 140 is disposed within the internal space 113u on the rear side of the electrical equipment housing 113. The cover/casing unit 140 is made of a cast product of metal such as aluminum, and includes a cover portion 141 and a channel casing portion 142 disposed on the rear side of the cover portion 141 in the axial direction. The cover/casing unit 140 is fixed to the rear side of the sensor casing 113b with a plurality of bolts 145. Due to this fixation, the cover part 141 of the cover/casing unit 140 closes the rear opening in the axial direction of the sensor casing 113b. In this state, the joint surface 113c, which is the rear end surface of the sensor casing 113b in the axial direction, and the joint surface, which is the front end surface of the cover part 141, which is the sensor cover, are joined. The channel casing part 142 of the cover/casing unit 140 has a rectangular shape and includes a rectangular relay space 142c. The flow path casing portion 142 opens toward the rear side in the axial direction, and a relay space 142c is arranged on the front side of this opening.

Each of the sensor casing 113b and the cover/casing unit 140 includes a first liquid path (113f, 142a) extending in the axial direction and a second liquid path (113g, 142b) extending in the axial direction. In addition, a refrigerant such as cooling water is used in the first liquid path 113f and the second liquid path 113g of the sensor casing 113b, the first liquid path 142a and the second liquid path 142b of the cover/casing unit 140, and the relay space 142c. is washed away.

A communication port that opens toward the rear side is provided at the end of the rear side in the axial direction of each of the first liquid passage 113f and the second liquid passage 113g of the sensor casing 113b. On the other hand, at the front end of each of the first liquid passage 142a and the second liquid passage 142b of the cover/casing unit 140, a communication port that opens toward the front side is provided. When the cover/casing unit 140 is fixed to the sensor casing 113b, the first liquid path 142a of the cover/casing unit 140 and the first liquid path 113f of the sensor casing 113b communicate with each other via the communication port. . In addition, the second liquid path 142b of the cover/casing unit 140 and the second liquid path 113g of the sensor casing 113b communicate with each other via a communication port.

A ring-shaped ring groove 113d recessed toward the front side in the axial direction and a half-moon-shaped gasket capture groove 113e recessed toward the front side in the axial direction are arranged on the joint surface 113c of the sensor casing 113b. . The ring groove 113d is arranged so as to surround the communication port of the first liquid path 113f of the sensor casing 113b. The first O-ring 131 is fitted into this ring groove 113d.

The first O-ring 131 surrounds each of the communication port of the first liquid path 113f of the sensor casing 113b and the communication port of the first liquid path 142a of the cover/casing unit 140. In addition, the first O-ring 131 is interposed between the joint surface 113c of the sensor casing 113b and the joint surface of the cover part 141 of the cover/casing unit 140. This suppresses refrigerant leakage from the communication port of the first liquid path 113f of the sensor casing 113b and the communication port of the first liquid path 142a of the cover/casing unit 140 through the gap between the two joint surfaces.

A ring-shaped ring groove 113h recessed toward the front side in the axial direction is arranged on the joint surface 113c of the sensor casing 113b. The ring groove 113h surrounds the communication port of the second liquid path 113g. A second O-ring 132 is fitted into this ring groove 113h. The second O-ring 132 surrounds each of the communication port of the second liquid path 113g of the sensor casing 113b and the communication port of the second liquid path 142b of the cover/casing unit 140. In addition, the second O-ring 132 is interposed between the joint surface 113c of the sensor casing 113b and the joint surface of the cover portion 141 of the cover/casing unit 140. This suppresses refrigerant leakage from the communication port of the second liquid path 113g of the sensor casing 113b and the communication port of the second liquid path 142b of the cover/casing unit 140 through the gap between the joint surfaces.

A relay connector 143 is fixed to the rear end surface of the cover portion 141 of the cover/casing unit 140 in the axial direction. The sensor connector 130a of the rotation detection sensor 130 and the relay connector 143 are electrically connected by a harness (not shown).

A sealing material made of a solidified liquid gasket is arranged on the joint surface 113c of the sensor casing 113b so as to surround the hollow of the sensor casing 113b with a predetermined width. This sealing material is interposed between the joint surface 113c of the sensor casing 113b and the joint surface of the cover portion 141 of the cover/casing unit 140. With this intervention, the airtightness of the hollow space of the sensor casing 113b can be improved at low cost by sealing the hollow space of the sensor casing 113b.

On the joint surface 113c of the sensor casing 113b, a gasket capture groove 113e is arranged between the sealing material and the first O-ring 131 in the surface direction. When the liquid gasket applied to the joint surface 113c of the sensor casing 113b solidifies, it becomes a sealing material. When the bonding surface 113c of the sensor casing 113b and the bonding surface of the cover part 141 of the cover/casing unit 140 are bonded, the liquid gasket spreads in the surface direction between the two bonding surfaces. Even if the liquid gasket spreads in this way, the spread portion of the liquid gasket flows into the gasket trapping groove 113e before reaching the first O-ring 131, and further spread is prevented. In this manner, the gasket trapping groove 113e suppresses the adhesion of the liquid gasket to the first O-ring 131, thereby suppressing deterioration of the first O-ring 131 due to adhesion of the liquid gasket.

FIG. 4 is an exploded perspective view showing the electrical equipment housing 113, the cover/casing unit 140, and the switching unit 162 from the rear side in the axial direction. FIG. 5 is a perspective view showing the switching unit 162. FIG. 6 is a sectional view showing the electrical equipment housing 113.

A joint surface 142e is arranged at the rear end of the channel casing portion 142 of the cover/casing unit 140. A switching unit 162 is joined to this joining surface 142e. Specifically, a plurality of female screw holes 142d are arranged on the joint surface 142e, and a male screw 169 is screwed into each female screw hole 142d, so that the switching unit 162 is screwed to the joint surface 142e. and joined. By this joining, the opening of the channel casing portion 142 of the cover/casing unit 140 is closed.

The switching unit 162 as an electrical component includes a gate substrate 163 and a semiconductor module 164 sealed with an exterior made of insulating resin. A plurality of semiconductor switching elements such as IGBTs (Insulated Gate Bipolar Transistors) are mounted inside the semiconductor module 164. The semiconductor module 164 is fixed to a surface of the gate substrate 163 opposite to the mounting surface.

A control board (not shown) is arranged within the internal space 113u of the electrical equipment housing 113. This control board and relay connector 143 are electrically connected by a harness (not shown). Through this electrical connection, a detection signal from the rotation detection sensor 130 is sent to the control board via the relay connector 143. Furthermore, this control board and gate board 163 are electrically connected by a second harness (not shown). Through this electrical connection, on/off command signals for the high-speed switching elements are transmitted from the control board to the gate board 163.

The semiconductor module 164 includes three DC anode terminals 164a and three DC cathode terminals 164b. Further, the semiconductor module 164 includes a U-phase terminal 164U, a V-phase terminal 164V, and a W-phase terminal 164W in an AC three-phase power supply. An anode of a DC external power source (the above-mentioned battery) is connected to each of the three DC anode terminals 164a. Furthermore, a cathode of an external DC power source is connected to each of the three DC cathode terminals 164b. The switching unit 162 converts DC power sent from an external DC power source into AC three-phase power of an arbitrary frequency. U-phase, V-phase, and W-phase in the AC three-phase power supply are output from a U-phase terminal 164U, a V-phase terminal 164V, and a W-phase terminal 164W.

The U-phase terminal 164U, V-phase terminal 164V, and W-phase terminal 164W are connected via a U-phase relay bus bar (not shown), a V-phase relay bus bar (not shown), and a V-phase relay bus bar (not shown). . The U-phase, V-phase, and W-phase are sent to the coil of the stator 3 of the motor section 102 via the U-phase bus bar 161U, the V-phase bus bar 161V, and the W-phase bus bar 161W.

In the partition wall 113a of the electrical equipment housing 113, a liquid inlet passage 113j (see FIG. 6) made of a hollow housing and a liquid outlet passage 113k (see FIG. 6) made of a hollow housing are arranged. The liquid inflow path 113j communicates with the second liquid path 113g of the sensor casing 113b. Moreover, the liquid outflow path 113k communicates with the first liquid path 113f of the sensor casing 113b. As shown by the arrow in FIG. 6, a refrigerant such as cooling water sent from the outside flows into the liquid inflow path 113j. The inflowing refrigerant flows into the relay space 142c via the second liquid path 113g of the sensor casing 113b and the second liquid path 142b of the cover/casing unit 140. Furthermore, the refrigerant in the relay space 142c flows out to the outside via the first liquid path (142a in FIG. 3) of the cover/casing unit 140, the first liquid path 113f of the sensor casing 113b, and the liquid outflow path 113k. do.

The semiconductor module 164 of the switching unit 162 is heated by driving a plurality of internal semiconductor switching elements. On the other hand, the refrigerant flowing in the relay space 142c directly cools the switching unit 162 by heading toward the first liquid path (142a in FIG. 3) while directly contacting the back surface of the semiconductor module 164 of the switching unit 162. Due to such direct cooling, the semiconductor switching elements within the semiconductor module 164 are efficiently cooled.

In the motor 1, an electrical component refrigerant flow path is constituted by the following liquid paths.
・Liquid inflow path 113j
・Second liquid path 113g of sensor casing 113b
- Second liquid path 142b of cover/casing unit 140
・Relay space 142c
- First liquid path 142a of cover/casing unit 140
- 1st liquid path 113f of sensor casing 113b
・Liquid outflow path 113k

A refrigerant such as cooling water is fed into the electrical equipment refrigerant flow path 113j by a pump (not shown). Among the refrigerant channels for electrical components, the relay space 142c, the first fluid channel 142a of the cover/casing unit 140, and the second fluid channel 142b of the cover/casing unit 140 are connected to the internal space 113u (accommodating electrical components) in the electrical component housing 113. space). On the other hand, the liquid inflow path 113j, the liquid outflow path 113k, the first liquid path 113f of the sensor casing 113b, and the second liquid path 113g of the sensor casing 113b are connected to the internal space 113t of the electrical equipment housing 113 (functioning as part of the rotating machine housing). space).

The semiconductor module 164 of the switching unit 162 constitutes a part of the wall of the relay space 142c. The refrigerant in the relay space 142c flows toward the downstream side while directly contacting the back surface of the semiconductor module 164.

In this configuration, compared to a conventional configuration (for example, the configuration described in Patent Document 1) in which a wall of the electrical equipment refrigerant flow path made of a pipe material is interposed between the refrigerant in the electrical equipment refrigerant flow path and the electrical component, Electrical components (switching unit 162) can be efficiently cooled.

In the electrical equipment housing 113, an end on the front side in the axial direction (the side indicated by arrow A in the figure) relative to the partition wall 113a functions as a part of the rotating machine housing. Further, the liquid inflow path 113j functions as an upstream end in the refrigerant flow direction of the electrical equipment refrigerant flow path. Further, the liquid outflow path 113k functions as a downstream end in the refrigerant flow direction of the electrical equipment refrigerant flow path.

As shown in the figure, each of the liquid inflow path 113j and the liquid outflow path 113k is arranged on the front side in the axial direction with respect to the rear side surface of the partition wall 113a. With such a configuration, the degree of freedom in layout of various electrical components within the electrical component housing 113 can be further improved. Specifically, in the electrical equipment housing 113, empty space is unlikely to occur on the rear side (arrow B side) in the axial direction, which forms a space in which many electrical components are arranged (inner space 113u in FIG. 1). . By arranging each of the liquid inflow path 113j and the liquid outflow path 113k on the front side of the partition wall 113a, the degree of freedom in layout of various electrical components within the electrical equipment housing 113 can be further improved.

FIG. 7 is a plan view showing the electrical equipment housing 113 and the drive shaft 106 from the rear side in the axial direction. As shown in the figure, the drive shaft 106 is arranged on the side of the electrical equipment housing 113. The electrical equipment housing 113 includes a recessed portion 113p for avoiding contact with the drive shaft 106. The drive shaft 106 is arranged in such a manner that a part of the circumferential surface of the drive shaft 106 is located in the depression of the depression 113p. With such a configuration, the distance between the drive shaft 106 and the electrical equipment housing 113 can be made closer, and the motor 1 can be made smaller than when the recess 113p is not provided.

As shown in the figure, the liquid outflow path 113k does not extend in a straight line on the plane of the partition wall 113a, but is bent in a crank shape. With such a configuration, the degree of freedom in layout of various electrical components within the electrical component housing 113 can be improved. Specifically, the double-headed arrow in the figure indicates the vertical direction. Further, the direction of arrow C indicates upward, and the direction of arrow D indicates downward. The motor 1 is designed on the premise that it will be installed with the electrical housing 113 in the position shown in the figure. Inside the electrical equipment housing 113, it is desirable to adopt a layout in which the cover/casing unit 140 is located at the center in the vertical direction, as shown in the figure. In the above-mentioned layout, by arranging the liquid inflow path 113j near the vertical center of the electrical equipment housing 113 as shown in the figure, the liquid inflow path 113j is extended in the horizontal direction, and the length of the liquid inflow path 113j is shortened. can be made the shortest. However, in the above arrangement, if a layout is adopted in which the liquid outflow path 113k is positioned on the axis L of the liquid inflow path 113j, the position of the liquid outflow path 113k and the position of the drive shaft 106 will conflict. Therefore, the liquid outflow path 113k cannot be arranged. For this reason, it becomes necessary to arrange the liquid inflow path 113j, the liquid outflow path 113k, and the cover/casing unit 140 at positions that are biased upward or downward. However, since the space inside the electrical equipment housing 113 is limited, as described above, It is very difficult to adopt a suitable layout. On the other hand, if the liquid outflow path 113k is shaped like a crank as shown in the figure, even if the cover/casing unit 140 is placed in the center in the vertical direction as shown in the figure, the liquid outflow path 113k and the position of the drive shaft 106 can be avoided. Therefore, the degree of freedom in layout of various electrical components within the electrical component housing 113 can be improved.

FIG. 8 is a longitudinal sectional view showing the motor housing 10, rotor 2, stator 3, and motor shaft 6. The motor housing 10 includes a first oil passage 10a, a second oil passage 10b, a front discharge hole 10c, and a rear discharge hole 10d. Each of the first oil passage 10a, the second oil passage 10b, the front discharge hole 10c, and the rear discharge hole 10d is formed in a hollow space provided in the motor housing 10.

Each of the first oil passage 10a and the second oil passage 10b functions as a part of a rotating machine refrigerant flow path through which cooling oil as a refrigerant for cooling the internal space of the motor housing 10 flows. The first oil passage 10a and the second oil passage 10b are connected to each other via a relay oil passage (not shown) provided in the motor housing (75 in FIG. 2). Further, each of the first oil passage 10a and the second oil passage 10b extends in the axial direction, and is arranged in a manner that is point-symmetrical to each other about the rotation axis Ax.

Cooling oil stored in the internal space of the motor housing 10 is discharged into the first oil passage 10a while being sucked by an electric oil pump (not shown). In the first oil passage 10a, cooling oil flows from the rear side (arrow B side) to the front side (arrow A side) in the axial direction, as shown by arrow E in the figure. Then, it flows into the second oil passage 10b via the above-mentioned relay oil passage. In the second oil passage 10b, cooling oil flows from the front side to the rear side in the axial direction, as shown by arrow F in the figure.

The front side discharge hole 10c communicates with the front side portion of the second oil passage 10b in the axial direction and the internal space of the motor housing 10. A part of the cooling oil flowing in the second oil passage 10b is discharged toward the coil of the stator 3 via the front discharge hole 10c.

The rear discharge hole 10d communicates with the rear side portion of the second oil passage 10b in the axial direction and the internal space of the motor housing 10. A part of the cooling oil flowing in the second oil passage 10b is discharged toward the coil of the stator 3 via the rear discharge hole 10d.

FIG. 9 is a plan view showing the electrical equipment housing 113 from the front side in the axial direction. The partition wall 113a of the electrical equipment housing 113 includes a plurality of ribs 113a-1 on the front side surface in the axial direction for reinforcing the partition wall 113a. Each of the plurality of ribs 113a-1 is arranged in such a manner that it extends along a radial direction centered on the rotational axis Ax and is lined up along a circumferential direction centered on the rotational axis Ax. Among the plurality of ribs 113a-1, two ribs 113a-1 that are adjacent to each other in the circumferential direction form a groove 113a-2 that extends in the radial direction. The outer end of the groove 113a-2 in the radial direction is connected to the rear end of the second oil passage (10b in FIG. 8) of the motor housing (10 in FIG. 8) in the axial direction. The cooling oil that has flowed to the rear end of the second oil passage in the axial direction flows into the outer end of the groove 113a-2 in the radial direction. The groove 113a-2 allows the cooling oil to flow from the outside in the radial direction to the inside and guides it toward the bearing 4. Thereby, the cooling efficiency of the bearing portion of the motor shaft 6 can be improved. In addition, each of the two ribs 113a-1 can also be used as a side wall of the groove 113a-2, thereby reducing costs.

Although an example in which the present invention is applied to the motor 1 has been described, the present invention may also be applied to a generator (dynamo). The present invention is not limited to the above-described embodiments, and configurations different from the embodiments can also be adopted within the scope where the configuration of the present invention is applicable. The present invention has specific effects for each aspect described below.

[First aspect]
A first aspect includes a rotating machine housing (e.g., motor housing 10) that accommodates a rotor (e.g., rotor 2) and a stator (e.g., stator 3), and a rotating machine housing (e.g., motor housing 10) that accommodates electrical components, and a rotational axis of the rotor (e.g., rotational axis Ax). An electrical equipment housing (e.g. electrical equipment housing 113) adjacent to the rotating machine housing on one side (e.g. front side) and the other side (e.g. rear side) in the axial direction parallel to the rotating machine housing; An electrical equipment cover (e.g. electrical equipment cover 70) that closes an opening (e.g. opening 12) facing the other side at the other axial end of the electrical equipment housing, and a refrigerant for cooling the electrical equipment housing or the electrical components in the electrical equipment cover. A rotating machine (e.g., a motor 1) including a sink and an electrical equipment refrigerant flow path at least a portion of which in the refrigerant flow direction is disposed within the electrical equipment housing, the electrical equipment (e.g., the switching unit 162) comprising: At least the part of the wall constitutes the wall, and the internal refrigerant directly contacts the electrical component in at least the part of the electrical equipment refrigerant flow path.

According to this configuration, the electrical components (switching unit 162 ) can be cooled.

[Second aspect]
A second aspect is a rotating machine having the configuration of the first aspect, in which an upstream end (e.g. liquid inflow path 113j) and a downstream end (e.g. liquid outflow path) in the refrigerant flow direction of the electrical equipment refrigerant flow path are provided. 113k) are arranged inside the rotating machine housing.

With such a configuration, the degree of freedom in layout of various electrical components within the electrical component housing can be further improved.

[Third aspect]
A third aspect is a rotating machine having the configuration of the second aspect, wherein the rotating machine housing includes a rotating machine refrigerant flow path through which a refrigerant for cooling the internal space flows, and the rotating machine housing has an internal space. A partition wall (for example, a partition wall 113a) that partitions an internal space (for example, an internal space 113t) from an internal space (for example, an internal space 113u) of the electrical equipment housing has a plurality of ribs (for example, a rib 113a-1) for reinforcing the partition wall. on one side in the axial direction, and the plurality of ribs are arranged in such a manner that they extend along a radial direction centered on the rotational axis and lined up along a circumferential direction centered on the rotational axis. Among the plurality of ribs, two ribs adjacent to each other in the circumferential direction form a groove (for example, groove 113a-2) extending in the radial direction, and the groove is formed in the refrigerant flow path for the rotating machine. The refrigerant is guided from the outside to the inside in the radial direction.

With this configuration, it is possible to improve the cooling efficiency of the bearing portion of the motor shaft and to reduce costs by using each of the two grooves as side walls of the groove.

[Fourth aspect]
A rotating machine having the configuration according to the third aspect, in which an upstream end (e.g., liquid inflow path 113j) and a downstream end (e.g., liquid outflow path 113k) in the refrigerant flow direction of the electrical equipment refrigerant flow path. , at least one of the partition walls has a shape that does not extend in a straight line on the plane of the partition wall, but is bent in a crank shape.

With this configuration, the degree of freedom in layout of various electrical components within the electrical component housing can be further improved.

DESCRIPTION OF SYMBOLS 1... Motor (rotating machine), 2... Rotor, 3... Stator, 10... Motor housing (part of rotating machine housing), 12... Opening, 70... Electrical equipment cover, 113...Electrical housing (other part of the rotating machine housing and electrical housing), 113a...Partition wall, 113a-1...Rib, 113a-2...Groove, 113j...Liquid inflow channel (upstream end of refrigerant flow path for electrical components), 113k... liquid outflow path (downstream end of refrigerant flow path for electrical components), 113f... first liquid path of sensor casing (refrigerant flow path for electrical components) 113g...Second liquid path of the sensor casing (part of the refrigerant flow path for electrical equipment), 142a...First liquid path of the cover/casing unit (part of the refrigerant flow path for electrical equipment) ), 142b...Second liquid path of the cover/casing unit (part of the refrigerant flow path for electrical equipment), 142c...Relay space (part of the refrigerant flow path for electrical equipment), 162...Switching unit ( electrical parts)

Claims (2)

A rotating machine housing that accommodates a rotor and a stator, and a rotating machine housing that accommodates electrical components, and is attached to the rotating machine housing on the other side of one side and the other side in an axial direction that is a direction parallel to the rotational axis of the rotor. an electrical equipment cover that closes an opening facing the other side at the other end of the electrical equipment housing in the axial direction; a refrigerant for cooling the electrical equipment parts in the electrical equipment housing or the electrical equipment cover; A rotating machine in which at least a portion of the refrigerant in a flow direction includes an electrical equipment refrigerant flow path disposed within the electrical equipment housing,
The electrical component constitutes at least a portion of the wall,
In at least the part of the electrical equipment refrigerant flow path, the internal refrigerant is in direct contact with the electrical equipment component,
The electrical equipment housing includes a partition wall that partitions an internal space of the rotating machine housing and an internal space of the electrical equipment housing,
The partition wall includes a plurality of ribs on one side in the axial direction for reinforcing the partition wall,
The plurality of ribs are arranged in such a manner that they extend along a radial direction centered on the rotational axis and lined up along a circumferential direction centered on the rotational axis,
Of the plurality of ribs, two ribs adjacent to each other in the circumferential direction form a groove extending in the radial direction,
A rotating machine, wherein the groove constitutes a part of a refrigerant flow path for the rotating machine , and guides the refrigerant from the outside in the radial direction to the inside. A rotating machine housing that accommodates a rotor and a stator, and a rotating machine housing that accommodates electrical components, and is attached to the rotating machine housing on the other side of one side and the other side in an axial direction that is a direction parallel to the rotational axis of the rotor. an electrical equipment cover that closes an opening facing the other side at the other end of the electrical equipment housing in the axial direction; a refrigerant for cooling the electrical equipment parts in the electrical equipment housing or the electrical equipment cover; A rotating machine in which at least a portion of the refrigerant in a flow direction includes an electrical equipment refrigerant flow path disposed within the electrical equipment housing,
The electrical component constitutes at least a portion of the wall,
In at least the part of the electrical equipment refrigerant flow path, the internal refrigerant is in direct contact with the electrical equipment component,
The electrical equipment housing includes a partition wall that partitions an internal space of the rotating machine housing and an internal space of the electrical equipment housing,
The partition wall includes a sensor casing that houses a rotation detection sensor,
A rotating machine, wherein the sensor casing is provided with the electrical equipment refrigerant flow path.

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