JP2016127732A - Slip ring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip ring device which facilitates temperature rise of a cooling liquid in a low-temperature state to inhibit failure in electric continuity between slip rings and brushes.SOLUTION: A slip ring device 30 includes: conductive slip rings 31 which are rotatable around an axis; conductive brushes 32 which are provided contacting with the slip rings 31; a motor cover 2 and an end cover 3 which include a first housing space 4 housing the slip rings 31 and the brushes 32 and also include a lubrication oil 50 serving as a cooling liquid in the first housing space 4; a temperature sensor 40 which detects a temperature of the lubrication oil 50; a heat exchanger 53 which may emit heat of the lubrication oil 50; and an ECU 61 configured to receive temperature information detected by the temperature sensor 40. The ECU 61 is configured to control heat radiation of the lubrication oil 50 in the heat exchanger 53 and reduces the heat radiation of the lubrication oil 50 in the heat exchanger 53 when the temperature of the lubrication oil 50 is lower than a lower limit temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a slip ring device.

In a slip ring device provided in a rotating electrical machine, a brush that is electrically connected to an electrical device such as an inverter, a battery, or the like outside the rotating electrical machine is brought into contact with a slip ring that rotates together with a rotating shaft of the rotating electrical machine. Supply and demand of electricity is performed between the two. In addition to generating heat when the current flows, the brush slides while being pressed against the rotating slip ring, and thus generates heat due to friction. However, when the temperature of the brush rises above a predetermined temperature, the wear resistance of the brush is drastically reduced and the amount of wear of the brush is dramatically increased. As a result, the durability of the brush is significantly reduced.
For this reason, in order to cool a brush, the technique using the liquid which has the cooling performance superior to air is proposed. However, if the cooling liquid enters the contact portion between the brush and the slip ring and a liquid film is formed at the contact portion, the electrical continuity between the brush and the slip ring becomes poor. Therefore, a technique for suppressing this poor electrical continuity has also been proposed.

  For example, in a slip ring device of a composite motor as a rotating electric machine described in Patent Document 1, a slip ring and a brush are disposed in a sealed storage chamber of a storage case, and a fluorine-based liquid is sealed in the storage chamber. ing. The fluorine-based liquid is sealed in such an amount that the rotating shaft rotating together with the slip ring is immersed to the center axis position. Since the fluorinated liquid has a large thermal conductivity, specific heat and density compared to air and has excellent heat transfer performance, the slip ring and the brush can be effectively cooled. Furthermore, since the fluorine-based liquid has boundary lubricity inferior to that of mineral oil-based oil, even if it enters the contact portion between the slip ring and the brush, it does not form a liquid film at the contact portion, Maintain electrical continuity.

JP 2013-183559 A

  The slip ring device disclosed in Patent Document 1 has a problem that it cannot substitute for the cooling liquid because the electrical continuity between the slip ring and the brush depends on the characteristics of the fluorinated liquid. And the case where a mineral oil type oil is used instead of a fluorine-type liquid as a cooling liquid of a slip ring apparatus can be considered. The viscosity of mineral oil-based oils varies greatly with temperature and is relatively high at low temperatures. Accordingly, there is also a problem that an oil film is easily formed at the contact portion between the brush and the slip ring, particularly at a low temperature when the viscosity of the mineral oil-based oil is high.

  The present invention has been made to solve the above-described problems, and suppresses poor electrical continuity between the slip ring and the brush by promoting the temperature rise of the cooling liquid in a low temperature state. An object is to provide a slip ring device.

  In order to solve the above-described problems, a slip ring device according to the present invention includes a conductive slip ring that can rotate around an axis, a conductive brush provided in contact with the slip ring, a slip ring, and a brush. Detected from a case including a containing space and containing a cooling liquid in the containing space, a temperature detecting unit for detecting the temperature of the cooling liquid, a heat radiating unit capable of releasing heat of the cooling liquid, and a temperature detecting unit And a controller configured to receive the generated temperature information, wherein the controller is configured to control heat dissipation of the cooling liquid in the heat dissipating unit, and the temperature of the cooling liquid is predetermined. When the temperature is less than the temperature, the heat dissipation of the cooling liquid in the heat dissipation portion is reduced.

The heat radiating unit may be a heat exchanger that exchanges heat between the cooling liquid and the fluid.
When the temperature of the cooling liquid is lower than a predetermined temperature, the control unit may stop supplying the fluid to be exchanged with the cooling liquid to the heat exchanger.
The slip ring device includes a passage communicating the accommodation space and the heat radiating portion, and an opening / closing valve provided in the passage and capable of selecting opening and closing of the passage. When the temperature is lower than a predetermined temperature, the on-off valve may be controlled to close the passage.
The slip ring device includes: a first passage that communicates the heat radiating portion with the housing space; a second passage that communicates the housing space with the heat radiating portion; a bypass passage that communicates the first passage and the second passage; , Provided in any one of the second passage and the bypass passage, and the flow of the cooling liquid from the second passage toward the first passage is selectively switched between a state passing through the heat radiating portion and a state not passing through the heat radiating portion. The control unit may control the switching mechanism so as not to pass through the heat radiating unit when the temperature of the cooling liquid is lower than a predetermined temperature.

The slip ring device includes a passage communicating the accommodation space and the heat radiating portion, and a pump provided in the passage and capable of transferring the cooling liquid, and the control portion has a temperature of the cooling liquid less than a predetermined temperature. If so, the pump may be stopped.
The slip ring device may include a heat insulating material surrounding the accommodation space in the case.
The slip ring device includes a heating device for heating the cooling liquid, and the control unit controls the heating device to heat the cooling liquid by the heating device when the temperature of the cooling liquid is lower than a predetermined temperature. Good.
The slip ring device may include a blade-like body that is provided in the housing space so as to rotate together with the slip ring, and forms a flow in the cooling liquid by rotating.
The controller may control energization of the brush so that the brush is not energized when the temperature of the cooling liquid is lower than a predetermined temperature.

  According to the slip ring device of the present invention, it is possible to suppress poor electrical continuity between the slip ring and the brush by promoting the temperature rise of the cooling liquid in a low temperature state.

It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring apparatus which concerns on Embodiment 1 of this invention. It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring apparatus which concerns on Embodiment 2 of this invention. It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring apparatus which concerns on Embodiment 3 of this invention. It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring apparatus which concerns on Embodiment 4 of this invention. It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring apparatus which concerns on Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
First, the configuration of the slip ring device 30 and its surroundings according to Embodiment 1 of the present invention will be described.
Referring to FIG. 1, a configuration of a rotating electrical machine 100 including a slip ring device 30 is shown. In the following embodiments, rotating electric machine 100 will be described as being mounted on a hybrid vehicle that uses a diesel engine or a gasoline engine and rotating electric machine 100 as power sources.
The rotating electrical machine 100 includes a motor case 1, a motor cover 2, and an end cover 3 as its metal casing. The motor cover 2 is disposed so as to close the opening end 1 a of the substantially cylindrical motor case 1. The end cover 3 is disposed so as to block the opening end of the motor cover 2 that is partially cylindrical.

  The motor cover 2 includes a plate-like flange portion 2a that is fixed to the opening end portion 1a of the motor case 1, and a cylindrical tube portion that extends into the motor case 1 from an opening portion near the center of the flange portion 2a. 2b and an annular projecting edge 2c projecting from the flange 2a on the opposite side of the tube 2b. The end cover 3 is attached to the protruding edge 2c.

A first accommodation space 4 that accommodates the slip ring 31, the brush 32, and the like of the slip ring device 30 is formed inside the end cover 3, the cylindrical portion 2 b, and the protruding edge portion 2 c. A second accommodation space 5 that accommodates the inner rotor 21, the outer rotor 22, and the stator 23 of the rotating electrical machine 100 is formed inside the motor case 1 and the motor cover 2 and outside the cylindrical portion 2 b. Here, the end cover 3 and the motor cover 2 constitute a case.
In the rotating electrical machine 100, the cylindrical outer rotor 22 is disposed so as to surround the outer periphery of the cylindrical inner rotor 21, and the cylindrical stator 23 is disposed so as to surround the outer periphery of the outer rotor 22. ing. Further, the inner rotor 21 and the outer rotor 22 are configured to be rotatable relative to each other on the same axis. The stator 23 is fixed to the motor case 1.

A rotating shaft 6 of the rotating electrical machine 100 is provided extending from the first receiving space 4 to the second receiving space 5 along the cylindrical axis direction of the cylindrical portion 2b.
Further, an inner rotor support member 21 c of the inner rotor 21 is connected to an end portion 6 a of the rotating shaft 6 extending into the second accommodating space 5 so as to rotate integrally with the rotating shaft 6. The inner rotor support member 21 c is disposed coaxially with the rotary shaft 6.

The inner rotor support member 21c includes a cylindrical input bearing insertion portion 21ca that protrudes coaxially from the end portion 6a of the rotary shaft 6 and the cylindrical inner rotor support that extends so as to surround the cylindrical portion 2b from the outside. The portion 21cc and a connecting portion 21cb extending in the radial direction of the input bearing insertion portion 21ca and connecting the input bearing insertion portion 21ca to the inner rotor support portion 21cc are integrally formed.
The input shaft 20 is fitted to the inner peripheral surface of the input bearing insertion portion 21ca so as to rotate integrally with the input bearing insertion portion 21ca and transmit a rotational driving force to each other. The input shaft 20 is mechanically connected to an engine of a hybrid vehicle on which the rotating electrical machine 100 is mounted so that the rotational driving force can be transmitted to each other.
The inner rotor support portion 21cc supports a cylindrical inner rotor core 21b of the inner rotor 21 provided on the outer periphery thereof. The inner rotor support portion 21cc and the inner rotor core 21b rotate integrally. The inner rotor core 21b includes a three-phase winding 21a arranged along the circumferential direction.

Further, the end portion of the inner rotor support portion 21cc is rotatably supported by the flange portion 2a via a bearing 24 provided on the outer peripheral side thereof.
The three-phase winding 21 a, the inner rotor core 21 b, and the inner rotor support member 21 c constitute the inner rotor 21.

  Further, in the second accommodating space 5, a cylindrical outer rotor core 22b of the outer rotor 22 is provided so as to surround the outer peripheral surface on the radially outer side of the inner rotor core 21b. The outer rotor core 22b has a permanent magnet 22a disposed along the circumferential direction therein.

  The outer rotor core 22b is supported by a first outer rotor support member 22c and a second outer rotor support member 22d provided so as to sandwich the outer rotor core 22b from both sides in the cylindrical axis direction. The second outer rotor support member 22d is located on the flange portion 2a side with respect to the outer rotor core 22b and has a cylindrical shape. The first outer rotor support member 22c is located on the opposite side of the outer rotor core 22b from the second outer rotor support member 22d, and has a bottomed cylindrical shape.

The first outer rotor support member 22c includes a cylindrical output shaft portion 22ca extending in the same direction and coaxially as the input bearing insertion portion 21ca, and a cylindrical peripheral wall portion 22cc connected to the outer rotor core 22b so as to rotate integrally therewith. And an annular plate-like bottom wall portion 22cb extending in the radial direction of the rotary shaft 6 from the output shaft portion 22ca to the peripheral wall portion 22cc by integral molding.
The output shaft portion 22ca is rotatably supported by the outer peripheral surface of the input bearing insertion portion 21ca via a bearing 25 provided on the inner peripheral side thereof. Further, the input shaft 20 passes through the output shaft portion 22ca.

  The second outer rotor support member 22d is coupled to rotate integrally with the outer rotor core 22b at one end in the cylindrical axis direction. The other end portion of the second outer rotor support member 22d is rotatably supported by the flange portion 2a via a bearing 26 provided on the outer peripheral side thereof.

Therefore, the outer rotor core 22b, the first outer rotor support member 22c, and the second outer rotor support member 22d are integrated with each other and rotate relative to the input bearing insertion portion 21ca, that is, relative to the rotary shaft 6 and the inner rotor 21. can do. The output shaft portion 22ca of the first outer rotor support member 22c is mechanically connected to a drive unit for running a hybrid vehicle on which the rotating electrical machine 100 is mounted so that the rotational drive force can be transmitted to each other.
The permanent magnet 22a, the outer rotor core 22b, the first outer rotor support member 22c, and the second outer rotor support member 22d constitute the outer rotor 22.

  In the second housing space 5, a cylindrical stator 23 is provided so as to surround the outer periphery of the outer rotor core 22b. The stator 23 is fixed to the motor case 1. Further, the stator 23 includes therein a three-phase winding 23a arranged along the circumferential direction. The three-phase winding 23 a of the stator 23 is electrically connected to an inverter 62 provided outside the rotating electrical machine 100. The inverter 62 is electrically connected to the battery 63. The inverter 62 converts the DC power supplied from the battery 63 into AC power and supplies it to the three-phase winding 23a and the like, and converts the AC power supplied from the three-phase winding 23a and the like into DC power. Can be supplied to the battery 63. The operation of the inverter 62 is controlled by the ECU 61 which is a control unit. The ECU 61 also controls the operation of an engine (not shown) of the hybrid vehicle.

  Further, in the first housing space 4, the periphery of the rotary shaft 6 is covered with an insulating member 33 made of resin or the like and having electrical insulation. Further, in the first accommodation space 4, three annular slip rings 31 are embedded around the cylindrical insulating member 33. The three slip rings 31 have the same shape and are arranged in a line at equal intervals along the axial direction of the rotary shaft 6. Each slip ring 31 is arranged coaxially with the rotary shaft 6. Further, each slip ring 31 is made of a conductive material. Each slip ring 31 has an outer peripheral surface on the outer side in the radial direction exposed from the insulating member 33.

In addition, three internal bus bars 34 made of a conductive material are embedded in the insulating member 33 so as to extend along the axial direction of the rotary shaft 6. The three internal bus bars 34 are electrically insulated from each other by the insulating member 33 and electrically insulated from the rotating shaft 6. Each of the three internal bus bars 34 is electrically connected to a different one of the three slip rings 31 and is connected to a different one of the three-phase windings 21 a of the inner rotor 21. Electrically connected.
The three slip rings 31 are electrically insulated from each other by the insulating member 33. The three internal bus bars 34 are electrically insulated from the internal bus bars 34 that are not electrically connected by the insulating member 33 and are electrically insulated from the rotating shaft 6.

  In the first accommodating space 4, three columnar brushes 32 made of a conductive material are arranged in contact with the outer peripheral surfaces of the three slip rings 31 in the radial direction, respectively. . The three brushes 32 are arranged at equal intervals along the circumferential direction with respect to one slip ring 31, that is, so as to form a central angle of 120 ° with respect to each other. Each brush 32 is pressed against the slip ring 31 by a biasing member such as a spring (not shown).

In the first accommodating space 4, a disc-shaped holder plate 35 extending along the radial direction of the slip ring 31 is disposed for each slip ring 31. Further, a cylindrical holding member 37 is disposed in the first accommodation space 4. The holding member 37 extends from the end cover 3 so as to surround the rotary shaft 6 along the axial direction of the rotary shaft 6. The three holder plates 35 are arranged at intervals inside the holding member 37.
The three brushes 32 that come into contact with the slip rings 31 are respectively held by the three cylindrical brush holders 36 disposed on the holder plate 35 so as to be slidable in a direction toward and away from the slip ring 31. ing.

  Each holder plate 35 is made of a conductive material. Each holder plate 35 is formed with an external bus bar 38 by integral molding. Each external bus bar 38 extends through the holding member 37 to the outside of the holding member 37. The three extended external bus bars 38 are electrically connected to the inverter 62. In addition, each holder plate 35 is electrically connected to each holding brush 32, whereby each brush 32 is electrically connected to the inverter 62.

  An inflow port 3 a and an outflow port 3 b that pass through the end cover 3 are formed and communicated with the first accommodation space 4. The inflow port 3 a is opened on the radially inner side of the holding member 37. The outflow port 3 b opens at the radially outer side of the holding member 37. Thus, a reciprocating flow path is formed in the first accommodation space 4 that passes through the inside and outside of the holding member 37 with the inlet 3a as an inlet and the outlet 3b as an outlet. In addition, as shown in FIG. 1, the rotary electric machine 100 is installed so that the inflow port 3a is located below and the outflow port 3b is located above in the gravitational direction.

A first flow path 51 extending from the outlet of a heat exchanger 53 provided outside the rotating electrical machine 100 communicates with the inflow port 3a. A second flow path 52 extending to the inlet of the heat exchanger 53 communicates with the outlet 3b. The first flow path 51 and the second flow path 52 communicate with each other via the heat exchanger 53. Further, the third flow path 54 communicates with another outlet of the heat exchanger 53, and the fourth flow path 55 communicates with another inlet of the heat exchanger 53.
The third flow path 54 and the fourth flow path 55 communicate with each other via the heat exchanger 53. The third channel 54 and the fourth channel 55 do not communicate with the first channel 51 and the second channel 52. The fourth flow passage 55 is configured to be supplied with cooling water of a hybrid vehicle on which the rotating electrical machine 100 is mounted. The cooling water flows from the fourth channel 55 toward the third channel 54. In the heat exchanger 53, the fluid flowing from the second flow path 52 toward the first flow path 51 and the cooling water flowing from the fourth flow path 55 toward the third flow path 54 are adjacent to each other. They are configured to flow in opposite directions.
The fourth flow path 55 is provided with an on-off valve 55a that can open and close the fourth flow path 55. The ECU 61 is configured to control the operation of the on-off valve 55a. The ECU 61 supplies or stops the supply of cooling water to the fourth flow path 55 by opening or closing the on-off valve 55a. Here, the heat exchanger 53 constitutes a heat radiating section.

  The entire first accommodating space 4 and the entire flow paths 51 and 52 are filled with a lubricating oil 50 that is a cooling liquid. The lubricating oil 50 not only serves as a cooling liquid but also has a lubricating action on sliding parts such as the periphery of the rotating shaft 6.

  Further, a resistance heating type heater coil 39 is disposed on the end cover 3 so as to heat the lubricating oil 50 in the first accommodation space 4. The heater coil 39 is disposed in the vicinity of the inlet 3 a inside the holding member 37 in the first accommodation space 4. Accordingly, the heater coil 39 heats the lubricating oil 50 in a state before flowing from the vicinity of the inlet 3a to the brush 32. The heater coil 39 is electrically connected to the inverter 62. The heating operation of the heater coil 39 by energization is performed by the ECU 61 controlling the inverter 62. The inverter 62 is configured to individually control energization to the heater coil 39, the three-phase winding 23a of the stator 23, and the brush 32. Here, the heater coil 39 constitutes a heating device.

  A temperature sensor 40 is disposed on the holding member 37. The temperature sensor 40 is configured to detect the temperature of the lubricating oil 50 and send the detection result to the ECU 61. In the following embodiment, the temperature sensor 40 is disposed in the vicinity of the end of the holding member 37 opposite to the end cover 3. Thereby, the temperature sensor 40 detects the temperature of the lubricating oil 50 in the vicinity of the brush 32 on the holder plate 35 farthest from the heater coil 39. Here, the temperature sensor 40 constitutes a temperature detection unit.

Next, the operation | movement of the slip ring apparatus 30 which concerns on Embodiment 1 of this invention, and its periphery is demonstrated.
Referring to FIG. 1, in the rotating electrical machine 100, when a rotational speed difference occurs between the inner rotor 21 and the outer rotor 22 in a state where the three-phase winding 21 a of the inner rotor 21 is not energized, the rotating electric machine 100 rotates relatively. Due to the action of the magnetic field generated by the permanent magnet 22a, an induced current that is a three-phase alternating current is generated in the three-phase winding 21a of the inner rotor 21. The generated induced current is sent to the inverter 62 via the internal bus bar 34, the slip ring 31, the brush 32, and the external bus bar 38 of the slip ring device 30. The ECU 61 controls the inverter 62 to convert the induced current into a direct current and store it in the battery 63. On the other hand, when the ECU 61 controls the inverter 62 to convert the DC power of the battery 63 into three-phase AC power and supplies it to the three-phase winding 21a of the inner rotor 21 via the slip ring device 30, the three-phase winding Rotational torque is generated between the inner rotor 21 and the outer rotor 22 by the magnetic field generated by the alternating current flowing through the wire 21a acting on the permanent magnet 22a.

  Further, when the ECU 61 controls the inverter 62 to convert the DC power of the battery 63 into three-phase AC power and supplies it to the three-phase winding 23a of the stator 23, the magnetic field generated by the AC current flowing through the three-phase winding 23a. Acts on the permanent magnet 22a, whereby rotational torque is applied to the outer rotor 22. On the other hand, when the outer rotor 22 rotates in response to the rotational torque from the inner rotor 21, an induced current is generated in the three-phase winding 23a of the stator 23 by the action of the magnetic field generated by the relatively rotating permanent magnet 22a. It is sent to the inverter 62. The ECU 61 controls the inverter 62 to convert the induced current into a direct current and store it in the battery 63.

  A hybrid vehicle equipped with the rotating electrical machine 100 travels by the rotational driving force, that is, torque, applied to the output shaft portion 22ca by the rotating electrical machine 100.

When energizing the brush 32 of the slip ring device 30, the ECU 61 operates the heater coil 39 and the cooling water to the fourth channel 55 based on the temperature information of the lubricating oil 50 acquired from the temperature sensor 40. Control the supply.
When it is necessary to energize the brush 32 and the temperature of the lubricating oil 50 acquired from the temperature sensor 40 is lower than a preset lower limit temperature, the ECU 61 does not immediately energize the brush 32 but first controls the inverter 62. Then, the heater coil 39 is energized. At the same time, the ECU 61 closes the on-off valve 55a and stops the supply of cooling water to the heat exchanger 53. Here, the lower limit temperature constitutes a predetermined temperature.

Due to the heat generated by the energized heater coil 39, the temperature of the lubricating oil 50 around the heater coil 39 rises. Thereby, in the 1st accommodation space 4, a temperature difference generate | occur | produces between the lubricating oil 50 of the inflow port 3a vicinity, and the lubricating oil 50 of the outflow port 3b vicinity. Furthermore, the heated lubricating oil 50 moves upward in the direction of gravity in the first accommodation space 4. Therefore, in the first accommodating space 4, natural convection of the lubricating oil 50 from the inside to the outside of the holding member 37, that is, natural convection of the lubricating oil 50 from the inflow port 3 a to the outflow port 3 b occurs.
Accordingly, the lubricating oil 50 flows through the inside of the holding member 37, the outside of the holding member 37, the outlet 3b, the second channel 52, the heat exchanger 53, the first channel 51, and the inlet 3a in order. Form. In the heat exchanger 53, since the supply of cooling water is stopped, the amount of heat of the lubricating oil 50 released to the heat exchanger 53 is greatly suppressed. For this reason, the temperature of the lubricating oil 50 around each brush 32 rises as the lubricating oil 50 heated by the heater coil 39 circulates.
When the temperature of the lubricating oil 50 acquired from the temperature sensor 40 exceeds the lower limit temperature, the ECU 61 stops energizing the heater coil 39 and energizes the brush 32.

  When the temperature of the lubricating oil 50 is at a low temperature below the lower limit temperature, the viscosity of the lubricating oil 50 is very high. When the lubricating oil 50 having a high viscosity enters between the rotating slip ring 31 and the brush 32, an oil film is formed therebetween. The formed oil film interrupts electrical conduction between the slip ring 31 and the brush 32. For this reason, when the brush 32 is energized, an energization failure occurs between the brush 32 and the slip ring 31, arc discharge occurs, and wear of the brush 32 is promoted.

  Further, when the temperature of the lubricating oil 50 acquired from the temperature sensor 40 reaches the preset upper limit temperature while the brush 32 is energized, the ECU 61 opens the on-off valve 55a and the cooling water is supplied to the heat exchanger 53. So that Thereby, in the heat exchanger 53, the cooling water and the lubricating oil 50 exchange heat, and the lubricating oil 50 is cooled. During energization of the brush 32, the brush 32 generates heat, and the lubricating oil 50 in the vicinity of the brush 32 is heated, so that the lubricating oil 50 is inside the holding member 37, outside the holding member 37, outlet 3b, second flow. Natural convection that circulates through the passage 52, the heat exchanger 53, the first passage 51, and the inlet 3a in sequence is generated. The lubricating oil 50 cooled by the heat exchanger 53 comes into contact with the slip ring 31, the brush 32, the brush holder 36, and the holder plate 35 after flowing into the first accommodation space 4 from the inflow port 3 a, and cools them. The element cooled by the lubricating oil 50 is supplied from the inlet 3a without coming into contact with the lubricating oil 50 after heat exchange with the element in the first accommodating space 4 again. Since it contacts the lubricating oil 50 after cooling, it is cooled effectively.

  As described above, the slip ring device 30 according to the first embodiment of the present invention includes the conductive slip ring 31 that can rotate around the axis, the conductive brush 32 that is provided in contact with the slip ring 31, The motor cover 2 and end cover 3 including the first storage space 4 for storing the slip ring 31 and the brush 32 and including the lubricating oil 50 as a cooling liquid in the first storage space 4 and the temperature of the lubricating oil 50 are detected. Temperature sensor 40, heat exchanger 53 capable of releasing heat of lubricating oil 50, and ECU 61 configured to receive temperature information detected from temperature sensor 40. The ECU 61 is configured to control the heat radiation of the lubricating oil 50 in the heat exchanger 53, and reduces the heat radiation of the lubricating oil 50 in the heat exchanger 53 when the temperature of the lubricating oil 50 is lower than the lower limit temperature. Further, the heat exchanger 53 exchanges heat between the lubricating oil 50 and cooling water as a heat exchange fluid. Then, when the temperature of the lubricating oil 50 is lower than the lower limit temperature, the ECU 61 stops supplying cooling water to be exchanged with the lubricating oil 50 to the heat exchanger 53. Furthermore, the ECU 61 controls energization of the brush 32 so as not to energize the brush 32 when the temperature of the lubricating oil 50 is lower than the lower limit temperature.

In the above-described configuration, when the temperature of the lubricating oil 50 is less than the lower limit temperature, the supply of the cooling water to be exchanged with the lubricating oil 50 to the heat exchanger 53 is stopped, whereby the heat radiation of the lubricating oil 50 in the heat exchanger 53 is stopped. Is reduced. Thereby, the lubricating oil 50 can raise its temperature quickly when heat is applied.
Therefore, it is possible to shorten the time during which the lubricating oil 50 is in a temperature state lower than the lower limit temperature that easily causes poor electrical continuity between the slip ring 31 and the brush 32. Furthermore, since the current to the brush 32 is not energized under the condition where the temperature of the lubricating oil 50 is lower than the lower limit temperature, the electrical continuity between the slip ring 31 and the brush 32 is reliably suppressed. Therefore, the slip ring device 30 can promote the temperature rise of the lubricating oil 50 in a low temperature state, and can suppress poor electrical conduction between the slip ring 31 and the brush 32.
Further, in the heat exchanger 53 that exchanges heat between the lubricating oil 50 and the heat exchange fluid, existing cooling water can be used as the heat exchange fluid in the hybrid vehicle on which the rotating electrical machine 100 is mounted.

The slip ring device 30 includes a heater coil 39 that heats the lubricating oil 50. The ECU 61 heats the lubricating oil 50 by the heater coil 39 when the temperature of the lubricating oil 50 is lower than the lower limit temperature. To control. Thereby, the temperature increase rate of the lubricating oil 50 can be increased.
In the slip ring device 30 according to the first embodiment, the heat exchanger 53 may be an air-cooled type, and the lubricating oil 50 flowing in the heat exchanger may exchange heat with the outside air. In this case, the ECU 61 controls the opening and shutting of the outside air blowing path to the heat exchanger, or controls the operation and stop of the fan that blows outside air to the heat exchanger. The heat dissipation of the lubricating oil 50 can be controlled.

Embodiment 2. FIG.
The slip ring device 230 according to the second embodiment of the present invention is the slip ring device 30 according to the first embodiment, wherein the heat exchanger 53 is an air-cooled heat exchanger 253 and is pumped in the middle of the second flow path 52. 56 is provided.
In the following embodiments, the same reference numerals as those in the previous drawings are the same or similar components, and thus detailed description thereof is omitted.

Referring to FIG. 2, the slip ring device 230 according to the second embodiment communicates the second channel 52 with the first channel 51 instead of the heat exchanger 53 of the slip ring device 30 according to the first embodiment. An air-cooled heat exchanger 253 is provided, and a pump 56 provided in the middle of the second flow path 52 is provided. The pump 56 pumps the lubricating oil 50 in the direction from the second flow path 52 toward the first flow path 51. The pump 56 is controlled in operation by the ECU 61.
Since the other structure of the slip ring apparatus 230 which concerns on Embodiment 2 of this invention is the same as that of Embodiment 1, description is abbreviate | omitted.

When energizing the brush 32 in the slip ring device 230 configured as described above, the ECU 61 controls the operation of the heater coil 39 and the pump 56 based on the temperature information of the lubricating oil 50 by the temperature sensor 40. .
When it is necessary to energize the brush 32 and the temperature of the lubricating oil 50 by the temperature sensor 40 is lower than the lower limit temperature, the ECU 61 first energizes the heater coil 39 without energizing the brush 32 immediately. At the same time, the ECU 61 stops the pump 56.

Since the pump 56 is stopped, the lubricating oil 50 stays in the first flow path 51 and the second flow path 52, and the lubricating oil 50 cooled by the heat exchanger 253 does not flow into the first accommodation space 4. In the first accommodating space 4, the lubricating oil 50 heated by the heater coil 39 generates natural convection that moves from the inside to the outside of the holding member 37. Thereby, the temperature of the lubricating oil 50 around each brush 32 rises. Furthermore, the lubricating oil 50 that is affected by the heating by the heater coil 39 is substantially limited to the lubricating oil 50 in the first accommodation space 4, and its heat capacity is equal to the volume of the first flow path 51 and the second flow path 52. Therefore, the temperature of the lubricating oil 50 is easily increased.
When the temperature of the lubricating oil 50 by the temperature sensor 40 exceeds the lower limit temperature, the ECU 61 stops energization of the heater coil 39 and energizes the brush 32.

When the temperature of the lubricating oil 50 by the temperature sensor 40 reaches the upper limit temperature while the brush 32 is energized, the ECU 61 operates the pump 56. Accordingly, the second flow channel 52, the heat exchanger 253, the first flow channel 51, the inflow port 3a, the inner side of the holding member 37, the outer side of the holding member 37, and the lubricating oil 50 that circulates through the outflow port 3b sequentially. A simple flow is formed. The lubricating oil 50 that has flowed out of the first storage space 4 into the second flow path 52 is cooled by the heat exchanger 253, and then flows into the first storage space 4 again from the inlet 3a, and the slip ring 31, the brush 32, The brush holder 36 and the holder plate 35 are cooled.
Moreover, since the other operation | movement of the slip ring apparatus 230 which concerns on Embodiment 2 of this invention is the same as that of Embodiment 1, description is abbreviate | omitted.

And according to the slip ring apparatus 230 which concerns on Embodiment 2 of this invention, the effect similar to the slip ring apparatus 30 of Embodiment 1 is acquired.
The slip ring device 230 includes a pump 56 that is provided in the second flow path 52 that communicates the first accommodation space 4 and the heat exchanger 253 and that can transfer the lubricating oil 50. When the temperature is lower than the lower limit temperature, the pump 56 is stopped. In the above-described configuration, the lubricating oil 50 in the first accommodation space 4 does not flow out of the motor cover 2 and the end cover 3 while the heater coil 39 is energized with the pump 56 stopped. Stay inside. As a result, the lubricating oil 50 is not cooled by exchanging heat with the external environment, and its heat capacity is reduced, so that the temperature of the lubricating oil 50 is easily increased.
In the slip ring device 230, the pump 56 may be provided in the first flow path 51.

Embodiment 3 FIG.
In the slip ring device 330 according to Embodiment 3 of the present invention, the on / off valve 57 is provided in the second flow path 52 without providing a pump in the slip ring device 230 according to Embodiment 2.
Referring to FIG. 3, the slip ring device 330 according to Embodiment 3 does not include a pump in the second flow path 52 and includes an opening / closing valve 57 on the path. The on-off valve 57 allows or blocks the flow of the lubricating oil 50 in the second flow path 52 by opening or closing. The on-off valve 57 is controlled in operation by the ECU 61. As the on-off valve 57, an electric valve, an electromagnetic valve, or the like can be used.

Further, the slip ring device 330 includes a plurality of propeller blades 58 in the form of a propeller on the rotating shaft 6. Here, the propulsion blade 58 constitutes a blade-like body.
The propulsion blade 58 rotates integrally with the rotary shaft 6 on the radially outer peripheral surface of the end portion 6b on the end cover 3 side of the rotary shaft 6 inside the holding member 37 in the first accommodating space 4. Is provided. That is, the propulsion blade 58 is disposed between the brush 32 and the end cover 3 that are closest to the end cover 3.
The propulsion blade 58 rotates together with the rotating shaft 6 to cause the lubricating oil 50 to flow in a direction from the end 6b of the rotating shaft 6 toward the end 6a.
Moreover, since the other structure of the slip ring apparatus 330 which concerns on Embodiment 3 of this invention is the same as that of Embodiment 2, description is abbreviate | omitted.

In the slip ring device 330 configured as described above, when the brush 32 is energized, the ECU 61 controls the operation of the heater coil 39 and the on-off valve 57 based on the temperature information of the lubricating oil 50 by the temperature sensor 40. To do.
When it is necessary to energize the brush 32 and the temperature of the lubricating oil 50 by the temperature sensor 40 is lower than the lower limit temperature, the ECU 61 first energizes the heater coil 39 without energizing the brush 32 immediately. At the same time, the ECU 61 closes the open / close valve 57. The rotating shaft 6 may or may not be rotating.
Since the on-off valve 57 blocks the movement of the lubricating oil 50, the lubricating oil 50 stays in the first flow path 51 and the second flow path 52 regardless of the rotation of the rotary shaft 6, and the first storage space 4 Then, the lubricating oil 50 remains in the first accommodation space 4.

When the rotating shaft 6 is not rotating, the lubricating oil 50 heated by the heater coil 39 in the first accommodating space 4 generates natural convection that moves from the inside to the outside of the holding member 37. Thereby, the temperature of the lubricating oil 50 around each brush 32 rises.
When the rotating shaft 6 is rotating, the propulsion blade 58 forms a forced flow of the lubricating oil 50 in the first housing space 4 and agitates the lubricating oil 50. Thereby, the temperature of the lubricating oil 50 around each brush 32 rises equally.
The lubricating oil 50 that is affected by the heating by the heater coil 39 is substantially limited to the lubricating oil 50 in the first accommodation space 4, and its heat capacity is equal to the volume of the first flow path 51 and the second flow path 52. Therefore, the temperature of the lubricating oil 50 is easily increased.
When the temperature of the lubricating oil 50 by the temperature sensor 40 exceeds the lower limit temperature, the ECU 61 stops energization of the heater coil 39 and energizes the brush 32.

Further, when the temperature of the lubricating oil 50 by the temperature sensor 40 reaches the upper limit temperature while the brush 32 is energized, the ECU 61 opens the on-off valve 57.
When the rotating shaft 6 is not rotating, the lubricating oil 50 is retained by the natural convection in the outflow port 3b, the second flow channel 52, the heat exchanger 253, the first flow channel 51, the inflow port 3a, the inside of the holding member 37, and the holding member 37. It circulates through the outside of the member 37 sequentially. The lubricating oil 50 cooled by the heat exchanger 253 cools the slip ring 31, the brush 32, the brush holder 36, and the holder plate 35 after flowing into the first accommodation space 4.

When the rotating shaft 6 is rotating, the propulsion blade 58 forms a forced flow of the lubricating oil 50 in the first accommodation space 4. Thereby, since the flow volume of the lubricating oil 50 after cooling in the heat exchanger 253 increases, the slip ring 31, the brush 32, the brush holder 36, and the holder plate 35 are effectively cooled.
Moreover, since the other operation | movement of the slip ring apparatus 330 which concerns on Embodiment 3 of this invention is the same as that of Embodiment 2, description is abbreviate | omitted.

And according to the slip ring apparatus 330 which concerns on Embodiment 3 of this invention, the effect similar to the slip ring apparatus of Embodiment 1 and 2 is acquired.
In addition, the slip ring device 330 is provided in the second flow path 52 that communicates the first accommodation space 4 and the heat exchanger 253, and can open and close the second flow path 52 selectively. The ECU 61 controls the open / close valve 57 so as to close the second flow path 52 when the temperature of the lubricating oil 50 is lower than the lower limit temperature. In the above-described configuration, during energization of the heater coil 39 with the on-off valve 57 closed, the lubricating oil 50 in the first storage space 4 remains in the first storage space 4 without exchanging heat with the external environment. Therefore, it becomes easy to raise the temperature.

Further, the slip ring device 330 includes a propulsion blade 58 that is provided in the first storage space 4 so as to rotate together with the slip ring 31 and forms a flow in the lubricating oil 50 by rotating. With the above-described configuration, the temperature of the lubricating oil 50 around all the brushes 32 can be equalized by rotating the propulsion blade 58 while the heater coil 39 is energized. Therefore, the temperature of the lubricating oil 50 around the brush 32 can be prevented from becoming lower than the temperature detected by the temperature sensor 40.
In the slip ring device 330, the opening / closing valve 57 may be provided in the first flow path 51.

Embodiment 4 FIG.
The slip ring device 430 according to the fourth embodiment of the present invention is obtained by changing the configurations of the first channel 51 and the second channel 52 in the slip ring device 330 according to the third embodiment.

Referring to FIG. 4, the slip ring device 430 according to the fourth embodiment does not include an on-off valve in the middle of the second flow path 52. The slip ring device 430 includes a bypass channel 59 that branches from the second channel 52 and connects to the first channel 51 so as to bypass the heat exchanger 253. Further, a three-way valve 60 as a switching mechanism is provided at a branch portion of the bypass flow channel 59 in the second flow channel 52.
In the three-way valve 60, the first portion 52a of the second flow path 52 that is closer to the outlet 3b than the three-way valve 60 is changed to the second portion 52b of the second flow path 52 that is closer to the heat exchanger 253 than the three-way valve 60 is. A state in which the first portion 52a is communicated with the bypass channel 59 is selectively switched between the state in which the first portion 52a is communicated with the bypass channel 59. The three-way valve 60 is controlled in operation by the ECU 61. As the three-way valve 60, an electric valve, an electromagnetic valve, or the like can be used.
Moreover, since the other structure of the slip ring apparatus 430 which concerns on Embodiment 4 of this invention is the same as that of Embodiment 3, description is abbreviate | omitted.

When the brush 32 is energized in the slip ring device 430 configured as described above, the ECU 61 controls the operation of the heater coil 39 and the three-way valve 60 based on the temperature information of the lubricating oil 50 by the temperature sensor 40. To do.
When it is necessary to energize the brush 32 and the temperature of the lubricating oil 50 by the temperature sensor 40 is lower than the lower limit temperature, the ECU 61 first energizes the heater coil 39 without energizing the brush 32 immediately. At the same time, the ECU 61 operates the three-way valve 60 so that the first portion 52 a of the second flow path 52 communicates with the bypass flow path 59. The rotating shaft 6 may or may not be rotating.
As a result, the lubricating oil 50 in the first portion 52 a of the second flow path 52 cannot flow to the heat exchanger 253 but flows only through the bypass flow path 59.

When the rotating shaft 6 is not rotating, the lubricating oil 50 heated by the heater coil 39 in the first accommodating space 4 generates natural convection that moves from the inside to the outside of the holding member 37. Therefore, the lubricating oil 50 sequentially passes through the inside of the holding member 37, the outside of the holding member 37, the outlet 3b, the first portion 52a of the second channel 52, the bypass channel 59, the first channel 51, and the inlet 3a. Form a circulating flow. Thereby, the temperature of the lubricating oil 50 around each brush 32 rises.
When the rotating shaft 6 is rotating, the propulsion blade 58 forms a forced flow of the lubricating oil 50 in the first accommodation space 4, and thus the above-described circulating flow is forcibly formed. The lubricating oil 50 is agitated by the forced flow, and the temperature of the lubricating oil 50 around each brush 32 rises evenly.

The lubricating oil 50 affected by the heating by the heater coil 39 is substantially present in the first accommodation space 4, the first portion 52 a of the second flow path 52, the bypass flow path 59, and a part of the first flow path 51. The lubricating oil 50 is more likely to rise in temperature in order to reduce the heat capacity than when flowing through the second flow path 52, the heat exchanger 253, and the first flow path 51, which are limited to the lubricating oil 50.
When the temperature of the lubricating oil 50 by the temperature sensor 40 exceeds the lower limit temperature, the ECU 61 stops energization of the heater coil 39 and energizes the brush 32.

When the temperature of the lubricating oil 50 by the temperature sensor 40 reaches the upper limit temperature while the brush 32 is energized, the ECU 61 causes the three-way valve 60 to communicate the first portion 52a of the second flow path 52 with the second portion 52b. To work.
When the rotating shaft 6 is not rotating, the lubricating oil 50 is retained by the natural convection in the outflow port 3b, the second flow channel 52, the heat exchanger 253, the first flow channel 51, the inflow port 3a, the inside of the holding member 37, and the holding member 37. It circulates through the outside of the member 37 sequentially.
When the rotating shaft 6 is rotating, the lubricating oil 50 circulates in the same manner as described above with the flow rate increased by the forced flow generated by the propulsion blades 58.
Then, the lubricating oil 50 after being cooled by the heat exchanger 253 cools the slip ring 31, the brush 32, the brush holder 36 and the holder plate 35.
Moreover, since the other operation | movement of the slip ring apparatus 430 which concerns on Embodiment 4 of this invention is the same as that of Embodiment 3, description is abbreviate | omitted.

And according to the slip ring apparatus 430 which concerns on Embodiment 4 of this invention, the effect similar to the slip ring apparatus 330 of Embodiment 3 is acquired.
Further, the slip ring device 430 includes a first flow path 51 that communicates the heat exchanger 253 with the first accommodation space 4, a second flow path 52 that communicates the first accommodation space 4 with the heat exchanger 253, and a first flow path. 51 and a second flow path 52, and a three-way valve 60 provided at a connection portion between the bypass flow path 59 and the second flow path 52. The three-way valve 60 can select and switch the flow of the lubricating oil 50 from the second flow path 52 toward the first flow path 51 between a state passing through the heat exchanger 253 and a state not passing through the heat exchanger 253. . When the temperature of the lubricating oil 50 is lower than the lower limit temperature, the ECU 61 controls the three-way valve 60 so that it does not pass through the heat exchanger 253. In the above-described configuration, the lubricating oil 50 is not cooled by the heat exchanger 253 during energization of the heater coil 39 in a state where the lubricating oil 50 does not pass through the heat exchanger 253, and therefore, the temperature easily rises.

Further, in the slip ring device 430, the three-way valve 60 by external control such as an electric valve or a solenoid valve is used as the switching mechanism, but a three-way valve by internal control such as a mechanical thermostat or an electric thermostat may be used. When using an internal control three-way valve, the ECU 61 controls only the heater coil 39 based on the temperature of the lubricating oil 50 without controlling the three-way valve.
In the slip ring device 430, the three-way valve 60 as the switching mechanism is provided at the connection portion between the bypass flow path 59 and the second flow path 52, but is not limited thereto. The switching mechanism may be provided in any of the first flow path 51, the second flow path 52, and the bypass flow path 59.
Specifically, the three-way valve 60 as a switching mechanism may be provided at a connection portion between the first flow path 51 and the bypass flow path 59.
Alternatively, when an opening / closing valve is used instead of the three-way valve 60 as the switching mechanism, this opening / closing valve is connected to a portion of the first passage 51 between the bypass passage 59 and the heat exchanger 253 or in the second passage 52. You may provide in the site | part between the bypass flow path 59 and the heat exchanger 253. FIG. Also with the above configuration, the flow of the lubricating oil 50 from the second flow path 52 toward the first flow path 51 can be selected and switched between a state passing through the heat exchanger 253 and a state not passing through the heat exchanger 253. .

Embodiment 5 FIG.
The slip ring device 530 according to the fifth embodiment of the present invention is the slip ring device 230 according to the second embodiment, in which a heat insulating material is provided on a wall portion surrounding the first accommodation space 4.
Referring to FIG. 5, in the slip ring device 530 according to the fifth embodiment, the heat insulating material 71 is provided on the entire portion of the motor cover 2 facing the first accommodation space 4. The heat insulating material 71 may be attached to the surface of the motor cover 2 facing the first housing space 4 on the surface of the first housing space 4 side opposite to the first housing space 4 of this site. It may be attached to the surface on the side or embedded in this part. In this Embodiment, the heat insulating material 71 is made to adhere to the surface at the side of the 1st accommodating space 4 of the said site | part.

Further, a heat insulating material 72 is provided on the entire portion of the end cover 3 facing the first accommodation space 4. The heat insulating material 72 may be attached to the surface of the end cover 3 facing the first housing space 4 on the surface of the first housing space 4 side opposite to the first housing space 4 of this site. It may be attached to the surface on the side or embedded in this part. In the present embodiment, the heat insulating material 72 is provided so as to adhere to the surface of the above portion on the first accommodation space 4 side.
The heat insulating materials 71 and 72 provided as described above surround the entire first accommodation space 4.

Therefore, during energization of the heater coil 39, the heat of the lubricating oil 50 is prevented from being released and taken away to the wall portion of the motor cover 2 and the wall portion of the end cover 3 which are both made of metal. Accordingly, the temperature of the lubricating oil 50 is easily increased.
Moreover, since the other structure and operation | movement of the slip ring apparatus 530 which concern on Embodiment 5 of this invention are the same as that of Embodiment 2, description is abbreviate | omitted.
And according to the slip ring apparatus 530 which concerns on Embodiment 5 of this invention, the effect similar to the slip ring apparatus 230 of Embodiment 2 is acquired.
The slip ring device 530 includes heat insulating materials 71 and 72 that surround the first housing space 4 in the motor cover 2 and the end cover 3. Thus, the heat of the lubricating oil 50 can be prevented from being taken away by the motor cover 2 and the end cover 3.
Further, the heat insulating materials 71 and 72 in the slip ring device 530 may be provided in the slip ring device according to the first, third, and fourth embodiments.

  In the slip ring device according to the second to fifth embodiments, the heat exchanger 253 is air-cooled, but may be liquid-cooled. In this case, the heat exchanger 253 can have the same configuration as the heat exchanger 53 of FIG. In this case, when the heater coil 39 is energized, the control of the on / off valve 55a of the fourth flow path 55 of the heat exchanger 53 in the first embodiment and the pump 56, the on / off valve 57 or the switching mechanism in the second to fourth embodiments. The control of the three-way valve 60 may be combined.

Further, the pump 56 provided in the slip ring device 230 according to the second embodiment may be provided in the first flow path 51 or the second flow path 52 of the slip ring device 330 according to the third embodiment. 4 may be provided between the heat exchanger 253 and the bypass channel 59 in the second channel 52 of the second channel 52 of the slip ring device 430 or the first channel 51. By pumping the lubricating oil 50 to the heat exchanger 253 using the pump 56, a sufficient amount of the lubricating oil 50 can be cooled even when the rotating shaft 6 is rotating at a low speed.
In the slip ring device according to the first to fifth embodiments, the temperature sensor 40 may be provided at any location in the first accommodation space 4.

  In the slip ring device according to the first to fifth embodiments, the ECU 61 obtains the temperature information of the lubricating oil 50 from the temperature sensor 40 as the temperature detection unit, but is not limited to this. The ECU 61 may also serve as a temperature detection unit, and may estimate the temperature of the lubricating oil 50 from other obtainable elements. For example, the ECU 61 may estimate the temperature of the lubricating oil 50 using the outside air temperature around the slip ring device 30, the temperature of the wall portion surrounding the first accommodation space 4, and the like. When the rotating electrical machine 100 is cooled by a cooling fluid such as automatic transmission fluid or antifreeze, the ECU 61 may estimate the temperature of the lubricating oil 50 using the temperature of the cooling fluid or the like.

In the slip ring device according to the first to fifth embodiments, the heating device using the heater coil 39 may be provided at any location in the first storage space 4 or the lubricating oil 50 may be directly heated. Instead, it may be provided so as to heat the wall portion surrounding the first accommodation space 4.
In the slip ring device according to the first to fifth embodiments, the heater coil 39 is used as a heating device for the lubricating oil 50. However, the present invention is not limited to this, and a ceramic heater, a carbon heater, or the like may be used. Good. Ceramic heaters and carbon heaters can reduce power consumption.
In the slip ring device according to the first to fifth embodiments, the heater coil 39 may not be provided. In the rotating electrical machine 100, even when the brush 32 is not energized, operations such as rotation of the outer rotor 22 by energization of the three-phase winding 23a of the stator 23 and rotation of the inner rotor 21 by an engine (not shown) are performed. . By performing the above operation, the temperature of the second storage space 5, the motor case 1, and the motor cover 2 rises, so that the lubricating oil 50 in the first storage space 4 can also be heated.

Moreover, although the slip ring apparatus which concerns on Embodiment 1-5 was provided in the rotating shaft 6 of the inner side rotor 21, it is not limited to this. When a three-phase winding is provided on the outer rotor 22, a slip ring device may be provided on the rotating shaft of the outer rotor 22.
In the rotating electrical machine 100 including the slip ring device according to the first to fifth embodiments, the input shaft 20 is connected to the inner rotor 21, and the output shaft portion 22 ca is connected to the outer rotor 22. The output shaft portion 22 ca may be connected, and the input shaft 20 may be connected to the outer rotor 22.
Moreover, although the rotary electric machine 100 provided with the slip ring apparatus which concerns on Embodiment 1-5 was provided with the inner side rotor 21, the outer side rotor 22, and the stator 23, it is not limited to this. The rotating electrical machine may include only two rotors including the inner rotor 21 and the outer rotor 22 without including the stator 23. Also in such a rotating electrical machine, the slip ring device is provided on a rotating shaft of a rotor having a winding of two rotors.

Moreover, in the slip ring apparatus which concerns on Embodiment 1-5, although lubricating oil was used as a liquid for cooling, it is not limited to this. The cooling liquid only needs to have a cooling performance superior to that of air, and may be an organic medium, a fluorinated liquid, other fats and oils, water, or the like. When the rotating electrical machine 100 is mounted on an automobile, an automatic transmission fluid may be used as the cooling liquid. As the cooling liquid, a liquid having no conductivity is more preferable.
Further, in the slip ring device according to the first to fifth embodiments, the entire inside of the first accommodation space 4 is filled with the lubricating oil 50 as the cooling liquid, but the cooling liquid is contained in the first accommodation space 4. It may be enclosed in such an amount as to satisfy a part of the above. If the cooling liquid is ejected from the upper part of the first storage space 4, there is no limit to the lower limit of the amount of the cooling liquid stored in the first storage space 4. In the case where the cooling liquid is not ejected from the upper part of the first storage space 4, the cooling liquid is stored in the first storage space 4 in such an amount as to be scraped up by a rotating component such as the slip ring 31. It only has to be.

In the slip ring device according to the first to fifth embodiments, the three slip rings 31 are provided. However, the present invention is not limited to this, and there are four slip rings, even if there are two or less. It may be the above. Further, the number of brushes 32 that contact each slip ring is not limited to three, and may be two or less or four or more.
Further, the slip ring device according to the first to fifth embodiments is not limited to the one mounted on the double rotor type rotating electric machine 100, and may be provided in any rotating electric machine, and is electrically connected to the rotating body. It may be provided in any machine having
The rotating electrical machine 100 is not limited to being mounted on a hybrid vehicle, but is mounted on a machine powered by a rotating electrical machine and an internal combustion engine such as a gasoline engine or a diesel engine such as a construction machine or a diesel locomotive. Also good.

  2 Motor cover (case), 3 End cover (case), 4 First accommodation space, 30, 230, 330, 430, 530 Slip ring device, 31 Slip ring, 32 Brush, 39 Heater coil (heating device), 40 Temperature Sensor (temperature detection unit), 50 Lubricating oil (cooling liquid), 51 First channel (first channel), 52 Second channel (second channel), 53,253 Heat exchanger (heat radiation unit), 55a Open / close Valves, 56 pumps, 57 on-off valves, 58 propulsion blades (blade-like bodies), 59 bypass passages (bypass passages), 60 three-way valves (switching mechanisms), 61 ECUs (control units), 71, 72 heat insulating materials.

Claims (10)

A conductive slip ring rotatable about an axis;
A conductive brush provided in contact with the slip ring;
A case including a storage space for storing the slip ring and the brush and including a cooling liquid in the storage space;
A temperature detector for detecting the temperature of the cooling liquid;
A heat radiating part capable of releasing heat of the cooling liquid;
A slip ring device comprising a control unit configured to receive temperature information detected from the temperature detection unit,
The controller is
It is configured to control heat dissipation of the cooling liquid in the heat dissipating part,
When the temperature of the cooling liquid is lower than a predetermined temperature, the slip ring device reduces heat dissipation of the cooling liquid in the heat dissipation portion.   The slip ring device according to claim 1, wherein the heat radiating unit is a heat exchanger that exchanges heat between the cooling liquid and the fluid.   3. The slip ring device according to claim 2, wherein when the temperature of the cooling liquid is lower than the predetermined temperature, the control unit stops supplying the fluid to be exchanged with the cooling liquid to the heat exchanger. A passage communicating the housing space and the heat radiating portion;
An on-off valve provided in the passage and capable of selecting opening and closing of the passage;
The slip ring device according to any one of claims 1 to 3, wherein the control unit controls the on-off valve to close the passage when the temperature of the cooling liquid is lower than the predetermined temperature. A first passage communicating the heat radiating portion with the accommodating space;
A second passage communicating the housing space with the heat radiating portion;
A bypass passage communicating the first passage and the second passage;
The cooling liquid is provided in any one of the first passage, the second passage, and the bypass passage, and the flow of the cooling liquid from the second passage toward the first passage passes through the heat dissipation portion, and the heat dissipation. With a switching mechanism that can be selected and switched to a state that does not pass through the part,
The slip ring device according to any one of claims 1 to 3, wherein when the temperature of the cooling liquid is lower than the predetermined temperature, the control unit controls the switching mechanism so as not to pass through the heat radiating unit. A passage communicating the housing space and the heat radiating portion;
A pump provided in the passage and capable of transferring the cooling liquid;
The slip ring device according to any one of claims 1 to 5, wherein the control unit stops the pump when a temperature of the cooling liquid is lower than the predetermined temperature.   The slip ring apparatus as described in any one of Claims 1-6 provided with the heat insulating material which surrounds the said accommodation space in the said case. A heating device for heating the cooling liquid;
The said control part controls the said heating apparatus so that the said cooling liquid may be heated with the said heating apparatus, when the temperature of the said cooling liquid is less than the said predetermined temperature. Slip ring device.   The slip ring device according to any one of claims 1 to 8, further comprising a blade-like body that is provided in the housing space so as to rotate together with the slip ring and forms a flow in the cooling liquid by rotating. .   The slip ring device according to any one of claims 1 to 9, wherein the control unit controls energization of the brush so as not to energize the brush when the temperature of the cooling liquid is lower than the predetermined temperature. .

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