JP2016127733A - Slip ring device and vehicle control unit equipped with rotary electric machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip ring device which inhibits failure in electric continuity between slip rings and brushes regardless of characteristics and a temperature of a cooling liquid, and to provide a vehicle control unit equipped with a rotary electric machine including the slip ring device.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 11 and an end cover 12 which include a first housing space 13 housing the slip rings 31 and the brushes 32 and also include a lubrication oil 55 in the first housing space 13; a temperature sensor 38 which detects a temperature of the lubrication oil 55; and an ECU 110 configured to control electrification to the brushes 32 and receive temperature information detected by the temperature sensor 38. The ECU 110 prohibits the electrification to the brushes 32 when the temperature of the lubrication oil 55 is lower than a first predetermined temperature.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a slip ring device and a vehicle control device for a vehicle on which a rotating electrical machine including the slip ring device is mounted.

  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. For this reason, a technique for suppressing this poor electrical conduction 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. Further, when a mineral oil-based oil is used as the cooling liquid for the slip ring device instead of the fluorinated liquid, the viscosity of the mineral oil-based oil largely varies depending on the temperature, and becomes relatively high at a low temperature. 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 problems, and a slip ring device that suppresses poor electrical continuity between the slip ring and the brush regardless of the characteristics and temperature of the cooling liquid, Another object of the present invention is to provide a vehicle control device for a vehicle equipped with a rotating electrical machine including 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. A case including an accommodating space for containing the cooling liquid in the accommodating space, a temperature detecting unit for detecting the temperature of the cooling liquid, temperature information detected by the temperature detecting unit for controlling energization to the brush And a control unit configured to receive the control unit, wherein the control unit does not energize the brush when the temperature of the cooling liquid is lower than the first predetermined temperature.

The slip ring device includes a rotation speed detection unit that detects a rotation speed of the slip ring, and the control unit is configured to receive rotation speed information detected from the rotation speed detection unit, and the temperature of the cooling liquid is the first. When the rotational speed of the slip ring is equal to or lower than the predetermined rotational speed when the temperature is between the predetermined temperature and the second predetermined temperature, the brush may be energized.
The slip ring device may include a heating device that heats the cooling liquid.

A vehicle control device according to the present invention includes a slip ring device, an internal combustion engine, a first rotating electrical machine provided so as to be able to transmit a driving force between the internal combustion engine and the vehicle drive mechanism, and a vehicle drive mechanism. And a second rotating electrical machine provided so that a driving force can be transmitted between the first rotating electrical machine and the slip ring of the slip ring device integrated with a rotor including a winding in the first rotating electrical machine. The internal combustion engine is connected to the rotor so as to be able to transmit a driving force to each other, and the control unit is configured such that the temperature of the cooling liquid is less than a third predetermined temperature. In this case, the third predetermined temperature is equal to or higher than the first predetermined temperature and lower than the second predetermined temperature without energizing the rotor via the brush for starting the internal combustion engine using the rotational driving force of the rotor. It is.
The controller may heat the cooling liquid with a heating device when the temperature of the cooling liquid is lower than a third predetermined temperature.

  According to the slip ring device and the vehicle control device for a vehicle equipped with the rotating electrical machine including the slip ring device according to the present invention, the electrical continuity between the slip ring and the brush is not dependent on the characteristics and temperature of the cooling liquid. It becomes possible to suppress.

It is a mimetic diagram showing composition of a vehicle control device of a hybrid car carrying a rotary electric machine provided with a slip ring device concerning an embodiment of the invention. FIG. 2 is a cross-sectional side view of the slip ring device and the rotating electric machine of FIG. 1.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the configuration of the slip ring device 30 according to the embodiment of the present invention and its surroundings will be described.
Referring to FIG. 1, there is shown a configuration of a vehicle control device 100 for a hybrid vehicle equipped with a rotating electrical machine 1 including a slip ring device 30 according to an embodiment of the present invention. In the present embodiment, the description will be made assuming that the hybrid vehicle is equipped with the internal combustion engine 101 that is a diesel engine or a gasoline engine and the rotating electrical machine 1.
The vehicle control apparatus 100 includes an internal combustion engine 101 and a rotating electrical machine 1 that operates by three-phase AC power as a power source of a hybrid vehicle. The rotating electrical machine 1 includes an inner rotor 21, an outer rotor 22, and a stator 23, and forms a double rotor type rotating electrical machine.

The inner rotor 21 having a cylindrical shape and including a three-phase winding 21 a (see FIG. 2) along the circumferential direction in the vicinity of the outer peripheral surface thereof is closer to the center than the outer rotor 22 and the stator 23, and the rotating shaft 15. Are provided so as to rotate together. One end of the rotary shaft 15 is mechanically connected so that one end of the input shaft 20 rotates integrally.
Further, the other end of the input shaft 20 is mechanically connected to the drive shaft 101 a of the internal combustion engine 101 so that the rotational drive force of the internal combustion engine 101 is transmitted and the input shaft 20 rotates. The mechanical connection means that, as in the present embodiment, the input shaft 20 has a drive transmission mechanism 102 such as a speed increaser, a speed change mechanism such as a speed reducer, or a mechanical power transmission mechanism. Including the case of being indirectly connected to the drive shaft 101a and the case of being directly connected to the drive shaft 101a.

  A slip ring device 30 is provided at the other end of the rotating shaft 15. The slip ring device 30 is electrically connected to the three-phase winding 21 a of the inner rotor 21. The slip ring device 30 includes a slip ring 31 (see FIG. 2) provided so as to rotate integrally with the rotary shaft 15 and a brush 32 (see FIG. 2) electrically connected to an electric device outside the rotating electrical machine 1. ). The brush 32 is urged by a spring or the like so as to always contact the slip ring 31 that rotates together with the inner rotor 21 and the rotary shaft 15.

The cylindrical outer rotor 22 is provided on the outer side in the radial direction so as to surround the outer periphery of the inner rotor 21, and the permanent magnet 22 a embedded therein along the circumferential direction so as to face the inner rotor 21. (See FIG. 2). The outer rotor 22 is configured to be able to rotate relative to the inner rotor 21 along the outer periphery of the inner rotor 21.
Therefore, in the rotating electrical machine 1, the inner motor 2 that is one motor including the inner rotor 21 including the three-phase winding 21a and the outer rotor 22 including the permanent magnet 22a is formed. Here, the inner motor 2 constitutes a first rotating electrical machine.

A stator 23 having a cylindrical shape and including a three-phase winding 23 a (see FIG. 2) along the circumferential direction in the vicinity of the outer circumferential surface thereof is provided on the radially outer side so as to surround the outer circumference of the outer rotor 22. And is fixed to a motor case 10 (see FIG. 2) constituting the casing of the rotating electrical machine 1.
Therefore, in the rotating electrical machine 1, the outer motor 3 that is one motor including the outer rotor 22 including the permanent magnet 22a and the stator 23 including the three-phase winding 23a is formed. Here, the outer motor 3 constitutes a second rotating electrical machine.
In FIG. 1, cross sections of the inner rotor 21, the outer rotor 22, and the stator 23 are schematically shown.

  The output shaft portion 22ca is coupled to the outer rotor 22 so as to rotate integrally. The output shaft portion 22ca is mechanically coupled to a drive shaft 104 connected to the wheels 105 via a drive transmission mechanism 103 including a pinion gear and a driven gear having a reduction function, a differential gear, and the like. The drive transmission mechanism 103, the drive shaft 104, and the wheels 105 constitute a vehicle drive mechanism 106.

  In addition, the vehicle control device 100 includes a battery 109 that can charge and discharge DC power, and a first inverter 107 and a second inverter 108 that are electrically connected to the battery 109. Further, the first inverter 107 is electrically connected to the brush 32 of the slip ring device 30. The second inverter 108 is electrically connected to the three-phase winding 23 a of the stator 23. The first inverter 107 and the second inverter 108 are configured so that their operations are controlled by an ECU 110 that is a control unit. The first inverter 107 and the second inverter 108 can convert the DC power supplied from the battery 109 into three-phase AC power and supply it to the brush 32 of the slip ring device 30 and the three-phase winding 23a of the stator 23, respectively. it can. Further, the first inverter 107 and the second inverter 108 convert the three-phase AC power supplied from the brush 32 of the slip ring device 30 and the three-phase winding 23a of the stator 23 into DC power and supply it to the battery 109, respectively. be able to. Here, ECU110 comprises the control part.

  The ECU 110 controls power supply to the brush 32 of the slip ring device 30 by controlling the first inverter 107. Further, the ECU 110 controls the power supply to the three-phase winding 23 a of the stator 23 by controlling the second inverter 108. Further, ECU 110 is configured to detect a charging rate (SOC) of battery 109. The ECU 110 is configured to acquire the rotation speed information and generated torque information of the internal combustion engine 101 through the rotation sensor and the torque sensor, respectively, and to control the operation of the internal combustion engine 101. Furthermore, the ECU 110 acquires the rotation speed information from the rotation sensor 41 provided on the input shaft 20, detects the rotation speed of the inner rotor 21, and acquires the rotation speed information from the rotation sensor provided on the output shaft portion 22ca. Thus, the rotational speed of the outer rotor 22 is detected. Here, the rotation sensor 41 constitutes a rotation speed detection unit.

Further, detailed configurations of the slip ring device 30 and the rotating electrical machine 1 will be described.
Referring to FIG. 2, the rotating electrical machine 1 includes a motor case 10, a motor cover 11, and an end cover 12 as its casing. The motor cover 11 is disposed so as to close the opening end portion 10 a of the substantially cylindrical motor case 10. The end cover 12 is disposed so as to close the opening end of the motor cover 11 that is partially cylindrical.

The motor cover 11 includes a plate-like flange portion 11a that is fixed to the opening end portion 10a of the motor case 10, and a cylindrical tube portion that extends into the motor case 10 from an opening portion near the center of the flange portion 11a. 11b and the cyclic | annular protrusion edge part 11c which protrudes from the flange part 11a on the opposite side to the cylinder part 11b. The end cover 12 is attached to the protruding edge portion 11c.
A first accommodation space 13 for accommodating the slip ring device 30 is formed inside the end cover 12, the cylinder portion 11b, and the protruding edge portion 11c. A second accommodation space 14 for accommodating the inner rotor 21, the outer rotor 22, and the stator 23 is formed inside the motor case 10 and the motor cover 11 and outside the cylindrical portion 11 b. Here, the end cover 12 and the motor cover 11 constitute a case.

A rotating shaft 15 extending from the first accommodation space 13 to the second accommodation space 14 along the cylindrical axis direction of the cylindrical portion 11b is provided.
Further, an inner rotor support member 21 c of the inner rotor 21 is connected to an end 15 a of the rotating shaft 15 extending into the second accommodation space 14 so as to rotate integrally with the rotating shaft 15. The inner rotor support member 21 c is disposed coaxially with the rotary shaft 15.

The inner rotor support member 21c includes a cylindrical input bearing insertion portion 21ca that protrudes coaxially from the end portion 15a of the rotary shaft 15 and the cylindrical inner rotor support that extends so as to surround the cylindrical portion 11b 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 driving force 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 11a through 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.

  In addition, a cylindrical outer rotor core 22b of the outer rotor 22 is provided in the second housing space 14 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 11a 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 15 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 11a 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 15 and the inner rotor 21. can do. The output shaft portion 22ca of the first outer rotor support member 22c can transmit the rotational driving force to the driven gear of the drive transmission mechanism 103 (see FIG. 1) fitted to the outer peripheral surface thereof.
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 14, 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 10. Further, the stator 23 includes therein a three-phase winding 23a arranged along the circumferential direction.

In addition, in the first housing space 13, the periphery of the rotary shaft 15 is covered with an insulating member 33 made of resin or the like and having electrical insulation. Further, around the cylindrical insulating member 33, three annular slip rings 31 formed of a conductive material are electrically insulated from each other and from the rotary shaft 15 by the insulating member 33. Embedded. The three slip rings 31 having the same shape are arranged in a line at equal intervals along the axial direction of the rotary shaft 15. Each slip ring 31 is arranged coaxially with the rotary shaft 15. Further, each slip ring 31 exposes the outer circumferential surface on the outer side in the radial direction from the insulating member 33.
In addition, three bus bars 34 formed of a conductive material are embedded in the insulating member 33 in a state where they are electrically insulated from each other by the insulating member 33. The three bus bars 34 are electrically insulated from the rotating shaft 15 by the insulating member 33. Each of the three bus bars 34 is electrically connected to a different one of the three slip rings 31 and electrically connected to a different one of the three-phase windings 21 a of the inner rotor 21. Connected.
The three slip rings 31 are electrically insulated from each other by the insulating member 33. The three slip rings 31 are electrically insulated from the bus bar 34 that is not electrically connected by the insulating member 33 and electrically insulated from the rotating shaft 15.

Three columnar brushes 32 made of a conductive material are arranged in contact with the outer peripheral surfaces on the radially outer sides of the three slip rings 31, 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).
A disc-shaped holder plate 35 extending along the radial direction of the slip ring 31 is disposed for each slip ring 31. The three holder plates 35 are fixed and held by the holding member 37 inside a cylindrical holding member 37 extending from the end cover 12 along the axial direction of the rotary shaft 15.
The three brushes 32 that contact each slip ring 31 are slidably held in directions toward and away from the slip ring 31 by three brush holders 36 disposed on a disc-shaped holder plate 35. Has been.

An inflow port 12 a and an outflow port 12 b that penetrate the end cover 12 are formed and communicate with the first accommodation space 13. The inflow port 12 a is open on the radially inner side of the holding member 37. The outflow port 12 b opens at the radially outer side of the holding member 37. As a result, a reciprocating flow path that passes through the inside and outside of the holding member 37 with the inlet 12a as the inlet and the outlet 12b as the outlet is formed in the first accommodating space 13.
A first flow path 53 extending from the discharge port of the pump 51 outside the rotating electrical machine 1 communicates with the inflow port 12a. A second flow path 54 extending to the suction port of the pump 51 communicates with the outflow port 12b. An air-cooled or liquid-cooled cooler 52 is provided in the middle of the first flow path 53. The pump 51 is configured such that its operation is controlled by the ECU 110 (see FIG. 1).

  The inside of the first storage space 13 and the inside of the first channel 53 and the second channel 54 are filled with the lubricating oil 55 that is a cooling liquid. When the pump 51 is operated, the lubricating oil 55 flows through the first accommodation space 13 and the flow paths 53 and 54 and is cooled by the cooler 52 in the process. Note that the lubricating oil 55 not only serves as a cooling liquid but also has a lubricating action on a sliding portion such as around the rotary shaft 15.

Further, the temperature sensor 38 is disposed on the end cover 12 so that the temperature of the lubricating oil 55 in the first accommodation space 13 can be detected. The temperature sensor 38 is disposed at a position inside the holding member 37 in the first accommodating space 13 and detects the temperature of the lubricating oil 55 in a state after flowing in from the inlet 12a but before flowing into the brush 32. . The temperature sensor 38 is configured to send the detected temperature information to the ECU 110 (see FIG. 1). Here, the temperature sensor 38 constitutes a temperature detection unit.
Furthermore, the heater coil 39 is disposed on the end cover 12 so as to heat the lubricating oil 55 in the first accommodation space 13. The heater coil 39 is disposed at a position inside the holding member 37 in the first accommodation space 13. The heater coil 39 heats the lubricating oil 55 in a state after flowing in from the inlet 12a but before flowing into the brush 32. The heating operation of the heater coil 39 by energization is configured to be controlled by the ECU 110. Here, the heater coil 39 constitutes a heating device.

Next, the operation | movement of the slip ring apparatus 30 which concerns on embodiment of this invention, and its periphery is demonstrated.
1 and 2 together, in the vehicle control device 100, in the inner motor 2 of the rotating electrical machine 1, when a rotational speed difference occurs between the inner rotor 21 and the outer rotor 22, the permanent motor that rotates relatively. An induced current, which is a three-phase alternating current, is generated in the three-phase winding 21a of the inner rotor 21 by the action of the magnetic field generated by the magnet 22a. The generated induced current is sent to the first inverter 107 via the bus bar 34, the slip ring 31 and the brush 32 of the slip ring device 30. ECU 110 controls first inverter 107 to convert the induced current into a direct current and store it in battery 109. That is, the inner motor 2 operates as a generator. On the other hand, when the ECU 110 controls the first inverter 107 to convert the DC power of the battery 109 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, A magnetic field generated by an alternating current flowing through the phase winding 21a acts on the permanent magnet 22a, thereby generating a rotational torque between the inner rotor 21 and the outer rotor 22. That is, the inner motor 2 operates as a drive source.

  In addition, for the outer motor 3 of the rotating electrical machine 1, the ECU 110 controls the second inverter 108 to convert the DC power of the battery 109 into three-phase AC power and supplies it to the three-phase winding 23 a of the stator 23. Then, a magnetic field generated by an alternating current flowing through the three-phase winding 23a acts on the permanent magnet 22a, thereby giving rotational torque to the outer rotor 22. That is, the outer motor 3 operates as a drive source. 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 second inverter 108. ECU 110 controls second inverter 108 to convert the induced current into a direct current and store it in battery 109. That is, the outer motor 3 operates as a generator.

  ECU 110 starts pump 51 when the temperature of lubricating oil 55 received from temperature sensor 38 rises to a preset temperature that requires cooling after starting operation of rotating electrical machine 1 as described above. The pump 51 pumps the lubricating oil 55 in the direction from the second flow path 54 toward the first flow path 53. Accordingly, the first flow path 53 including the cooler 52, the inlet 12a, the inside of the holding member 37 in the first accommodating space 13, the outside of the holding member 37, the outlet 12b, the second flow path 54, and the pump 51 are sequentially passed. Thus, a flow of the lubricating oil 55 circulating is formed. The lubricating oil 55 comes into contact with the slip ring 31, the brush 32, the holder plate 35, and the brush holder 36 in the first housing space 13 and cools them. The cooled lubricating oil 55 is cooled by the cooler 52, and the cooled lubricating oil 55 is supplied to the inlet 12a again. Then, the above-described element cooled by the lubricating oil 55 is supplied by the pump 51 without coming into contact with the lubricating oil 55 after heat exchange with the above-mentioned element again in the first accommodating space 13. Since it contacts the lubricating oil 55 after cooling, it is cooled effectively.

  The vehicle control device 100 causes a hybrid vehicle on which the vehicle control device 100 is mounted to travel by a rotational driving force, that is, torque, applied to the output shaft portion 22ca by the rotating electrical machine 1. At this time, the torque of the rotating electrical machine 1 is transmitted to the wheels 105 via the output shaft portion 22ca, the drive transmission mechanism 103, and the drive shaft 104, thereby causing the hybrid vehicle to travel.

  The ECU 110 of the vehicle control device 100 controls the travel of the hybrid vehicle by appropriately selecting the EV mode travel mode and the HV mode travel mode. In the EV mode travel mode, the ECU 110 drives the outer rotor 22 of the outer motor 3 by supplying the electric power of the battery 109 to the stator 23 of the rotating electrical machine 1 while the internal combustion engine 101 is stopped. In the HV mode travel mode, the ECU 110 drives the outer rotor 22 while rotationally driving the input shaft 20 and the inner rotor 21 of the inner motor 2 of the rotating electrical machine 1 using the power of the internal combustion engine 101. In the HV mode travel mode, the power of the battery 109 may or may not be used.

When supplying electric power to the brush 32, the ECU 110 adjusts the energization timing of the brush 32 according to the temperature of the lubricating oil 55 in the first accommodation space 13.
When the temperature of the lubricating oil 55 received from the temperature sensor 38 is lower than the first energization stop temperature T1, the ECU 110 does not energize the brush 32 at all. In this case, the ECU 110 energizes the brush 32 regardless of whether the slip ring 31 is rotating together with the inner rotor 21 or the slip ring 31 is stopped before the energization is determined. Not performed. Further, the ECU 110 does not energize the brush 32 in a state in which the rotation of the slip ring 31 is stopped, regardless of whether the slip ring 31 may rotate after energization of the brush 32.

  The low temperature below the first energization stop temperature T1 is that the viscosity of the lubricating oil 55 is very high, and the lubricating oil 55 that has entered between the slip ring 31 and the brush 32 is not rotating. However, the temperature is such that an oil film is formed between the slip ring 31 and the brush 32. In addition, in order to interrupt the electrical continuity between the slip ring 31 and the brush 32, the formed oil film causes an energization failure when the brush 32 is energized, and between the brush 32 and the slip ring 31. Arc discharge occurs and promotes wear of the brush 32.

  Further, the ECU 110 does not energize the brush 32 except in some cases when the temperature of the lubricating oil 55 is equal to or higher than the first energization stop temperature T1 but less than the second energization stop temperature T2. In this case, the ECU 110 does not energize the brush 32 even if the slip ring 31 is rotating or the slip ring 31 is stopped before the energization is determined. However, the ECU 110 does not energize the brush 32 only when the slip ring 31 rotates after energization in a state where the slip ring 31 is de-rotated, and the slip ring 31 stops rotating even after energization. If you want to continue, energize.

  Note that, at a low temperature not lower than the first energization stop temperature T1 and lower than the second energization stop temperature T2, the lubricating oil 55 having a relatively high viscosity forms an oil film between the slip ring 31 and the brush 32 that have stopped rotating. However, when the slip ring 31 starts rotating together with the inner rotor 21 after being energized, an oil film that penetrates between the slip ring 31 and the brush 32 and causes arc discharge is formed.

The cranking operation of the internal combustion engine 101 corresponds to the operation of supplying the electric power to the inner rotor 21 that has stopped rotating together with the slip ring 31 for rotation. When electric power is supplied to the inner rotor 21 in a state where electric power is supplied to the stator 23 and rotational driving force is generated in the outer rotor 22, the inner rotor 21 is placed outside via a rotating magnetic field generated by the three-phase winding 21a. It is driven to rotate by receiving a reaction force from the permanent magnet 22a of the rotor 22, and thereby the drive shaft 101a of the internal combustion engine 101 is driven to crank. Therefore, ECU 110 does not crank the internal combustion engine 101 when the temperature of the lubricating oil 55 is lower than the second energization stop temperature T2.
Here, the first energization stop temperature T1 or the second energization stop temperature T2 constitutes a first predetermined temperature, and the second energization stop temperature T2 constitutes a third predetermined temperature.

When the temperature of the lubricating oil 55 is equal to or higher than the second energization stop temperature T2 and equal to or lower than the third energization stop temperature T3, the ECU 110 determines that the rotation speed of the input shaft 20, that is, the rotation shaft 15 received from the rotation sensor 41 is equal to or less than the set rotation speed R. Only when the power is supplied to the brush 32.
The third energization stop temperature T3 is preset according to the characteristics of the slip ring device 30 and the lubricating oil 55. When the rotational speed of the rotating shaft 15, that is, the slip ring 31 is increased, the lubricating oil 55 easily forms an oil film between the slip ring 31 and the brush 32.
When the lubricating oil 55 is at a temperature higher than the third energization stop temperature T3, the third energization stop temperature T3 is the same even if the rotating shaft 15 and the slip ring 31 rotate at any number of rotations less than the allowable number of rotations of the rotating electrical machine 1. The temperature at which the lubricating oil 55 does not form an oil film that causes arc discharge between the slip ring 31 and the brush 32 is set.
Therefore, the slip ring device 30 is in a normal operation state when the temperature of the lubricating oil 55 exceeds the third energization stop temperature T3, and the temperature of the lubricant 55 is equal to or higher than the second energization stop temperature T2 and the third energization stop temperature. When T3 or less, the engine is in a warm-up operation state.

Then, an upper limit is set for the rotational speed of the slip ring 31 when the temperature of the lubricating oil 55 is within the range of the second energization stop temperature T2 or more and the third energization stop temperature T3, and the upper limit rotational speed is set to the second energization stop. The set rotational speed R is such that arc discharge does not occur between the slip ring 31 and the brush 32 at any temperature within the range of the temperature T2 to the third energization stop temperature T3.
Here, the third energization stop temperature T3 constitutes a second predetermined temperature, and the set rotational speed R constitutes a predetermined rotational speed.

  When the temperature of the lubricating oil 55 exceeds the third energization stop temperature T3, the ECU 110 energizes the brush 32 without providing a restriction on energization of the brush 32 as described above.

When the temperature of the lubricating oil 55 is lower than the second energization stop temperature T2, the ECU 110 energizes the heater coil 39 and causes the heater coil 39 to heat the lubricating oil 55.
Thereby, the time required for energizing the brush 32 is shortened. Then, the ECU 110 controls the energization of the brush 32 described above according to the temperature of the lubricating oil 55 that has risen due to heating. The heating by the heater coil 39 may also be performed when the temperature of the lubricating oil 55 is not less than the second energization stop temperature T2 and not more than the third energization stop temperature T3. Thereby, the slip ring apparatus 30 can reach a normal driving | running state at an early stage.

  As described above, the ECU 190 controls energization of the brush 32 according to the temperature state of the lubricating oil 55 or according to the temperature state of the lubricating oil 55 that changes due to heating.

  As described above, the slip ring device 30 according to the embodiment of the present invention includes the conductive slip ring 31 that can rotate around the axis, the conductive brush 32 provided in contact with the slip ring 31, and the slip ring. A motor cover 11 and an end cover 12 including a first storage space 13 for storing 31 and a brush 32 and including a lubricant 55 in the first storage space 13, a temperature sensor 38 for detecting the temperature of the lubricant 55, and a brush And ECU 110 configured to control energization to 32 and receive temperature information detected from the temperature sensor 38. The ECU 110 does not energize the brush 32 when the temperature of the lubricating oil 55 is lower than the first energization stop temperature T1 or the second energization stop temperature T2 as the first predetermined temperature.

Since the viscosity of the lubricating oil 55 is high when it is in a low temperature state, an oil film is easily formed when entering between the slip ring 31 and the brush 32, and an oil film is further easily formed when the slip ring 31 rotates. .
However, the brush 32 is not energized when the lubricating oil 55 is in a high viscosity state at a low temperature state less than the first energization stop temperature T1 or less than the second energization stop temperature T2 as less than the first predetermined temperature. In addition, between the slip ring 31 and the brush 32, it is possible to suppress the occurrence of poor electrical continuity and arc discharge due to the oil film. The suppression does not depend on the characteristics of the cooling liquid such as the lubricating oil 55. Therefore, the slip ring device 30 makes it possible to suppress poor electrical continuity between the slip ring 31 and the brush 32 regardless of the characteristics and temperature of the cooling liquid.

The slip ring device 30 includes a rotation sensor 41 that detects the rotation speed of the slip ring 31, and the ECU 110 is configured to receive rotation speed information detected from the rotation sensor 41, and the temperature of the lubricating oil 55 is the first. When the rotation speed of the slip ring 31 is equal to or lower than the set rotation speed R when the temperature is equal to or higher than the second power supply stop temperature T2 and equal to or lower than the third power supply stop temperature T3, power supply to the brush 32 is performed. In the above configuration, in the state where the temperature of the lubricating oil 55 is not sufficiently increased, the rotation speed of the slip ring 31 is suppressed, so that an oil film is generated by the lubricating oil 55 between the slip ring 31 and the brush 32. Can be suppressed.
The slip ring device 30 includes a heater coil 39 that heats the lubricating oil 55. By heating the lubricating oil 55 using the heater coil 39, the brush 32 can be energized early.

  In addition, the vehicle control device 100 according to the present invention includes a slip ring device 30, an internal combustion engine 101, an inner motor 2 and a vehicle provided so as to be able to transmit driving force between the internal combustion engine 101 and the vehicle drive mechanism 106. The rotating electrical machine 1 including the outer motor 3 provided so as to be able to transmit a driving force to and from the driving mechanism 106 is provided. The slip ring 31 of the slip ring device 30 is provided so as to rotate integrally with the inner rotor 21 including the three-phase winding 21a in the inner motor 2, and is electrically connected to the three-phase winding 21a. The internal combustion engine 101 is connected to the inner rotor 21 so that the driving force can be transmitted to each other. When the temperature of the lubricating oil 55 is lower than the second energization stop temperature T2, the ECU 110 energizes the inner rotor 21 via the brush 32 for starting the internal combustion engine 101 using the rotational driving force of the inner rotor 21. do not do. With the above configuration, it is possible to suppress poor electrical continuity between the slip ring 31 and the brush 32 when the internal combustion engine 101 is cranked.

Further, in the slip ring device 30 according to the embodiment, the temperature sensor 38 may be provided in any location in the first accommodating space 13 and the flow paths 53 and 54.
Further, in the slip ring device 30 according to the embodiment, the ECU 110 obtains the temperature information of the lubricating oil 55 from the temperature sensor 38 as the temperature detection unit, but is not limited thereto. ECU 110 may also serve as a temperature detection unit, and may estimate the temperature of lubricating oil 55 from other obtainable elements. For example, the ECU 110 may estimate the temperature of the lubricating oil 55 using the outside air temperature around the slip ring device 30, the temperature of the wall portion surrounding the first housing space 13, and the like. When the rotating electrical machine 1 is cooled by a cooling fluid such as an automatic transmission fluid or antifreeze, the ECU 110 may estimate the temperature of the lubricating oil 55 using the temperature of the cooling fluid or the like.

In the slip ring device 30 according to the embodiment, the heater coil 39 is used as a heating device for the lubricating oil 55. However, the heater coil 39 is not limited to this and may be a ceramic heater, a carbon heater, or the like.
Furthermore, the heating device using the heater coil 39 or the like may be provided at any location in the first storage space 13 or a wall portion surrounding the first storage space 13 without directly heating the lubricating oil 55. It may be provided to heat.

Moreover, although the slip ring apparatus 30 which concerns on embodiment was provided in the rotating shaft 15 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.
Further, in the rotating electrical machine 1 including the slip ring device 30 according to the embodiment, the input shaft 20 is connected to the inner rotor 21 and the output shaft portion 22ca is connected to the outer rotor 22, but the output shaft is connected to the inner rotor 21. The 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 1 provided with the slip ring apparatus 30 which concerns on embodiment 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 30 is provided on a rotating shaft of a rotor having a winding of two rotors.

In the slip ring device 30 according to the embodiment, the lubricating oil is used as the cooling liquid. However, the present invention 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 1 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 30 according to the embodiment, the entire inside of the first accommodation space 13 is filled with the lubricating oil 55 as the cooling liquid. It may be enclosed in an amount that fills the part. If the cooling liquid is ejected from the upper part of the first storage space 13, there is no limit to the lower limit of the amount of the cooling liquid stored in the first storage space 13. If the cooling liquid is not ejected from the upper part of the first storage space 13, the cooling liquid is stored in the first storage space 13 in such an amount that it can be scraped up by a rotating component such as the slip ring 31. It only has to be.

In the slip ring device 30 according to the embodiment, the three slip rings 31 are provided. However, the present invention is not limited to this, and the number of slip rings is four or more even if the number is two or less. There may be. 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 30 according to the embodiment is not limited to the one mounted on the double rotor type rotating electrical machine 1, and may be provided in any rotating electrical machine.
Moreover, in the vehicle control apparatus 100, the rotary electric machine 1 is not limited to a double rotor type | mold, You may be comprised from two separate rotary electric machines.
Further, the vehicle control device 100 is not limited to being mounted on a hybrid vehicle, and is mounted on a machine powered by an internal combustion engine such as a construction machine, a diesel engine, a gasoline engine, and a diesel engine, and a rotary electric machine. May be.

  DESCRIPTION OF SYMBOLS 1 Rotating electrical machine, 2 Inner motor (1st rotating electrical machine), 3 Outer motor (2nd rotating electrical machine), 11 Motor cover (case), 12 End cover (case), 13 1st accommodation space, 21 Inner rotor (rotor) ), 21a Three-phase winding, 30 slip ring device, 31 slip ring, 32 brush, 38 temperature sensor (temperature detection unit), 39 heater coil (heating device), 41 rotation sensor (rotation speed detection unit), 55 lubricating oil (Cooling liquid), 101 internal combustion engine, 106 vehicle drive mechanism, 109 ECU (control unit).

Claims (5)

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 slip ring device comprising: a controller configured to control energization of the brush and receive temperature information detected from the temperature detector;
The control unit is a slip ring device that does not energize the brush when the temperature of the cooling liquid is lower than a first predetermined temperature. A rotation speed detector for detecting the rotation speed of the slip ring;
The controller is
Configured to receive rotation speed information detected from the rotation speed detector;
2. The power supply to the brush according to claim 1, wherein when the temperature of the cooling liquid is equal to or higher than the first predetermined temperature and equal to or lower than a second predetermined temperature, the brush is energized when the rotational speed of the slip ring is equal to or lower than the predetermined rotational speed. Slip ring device.   The slip ring device according to claim 1, further comprising a heating device that heats the cooling liquid. The slip ring device according to any one of claims 1 to 3,
An internal combustion engine;
A first rotating electrical machine provided so as to be able to transmit a driving force between the internal combustion engine and the vehicle drive mechanism;
A vehicle control device comprising a second rotating electrical machine provided so as to be able to transmit a driving force to and from the vehicle drive mechanism,
The slip ring of the slip ring device is provided to rotate integrally with a rotor including a winding in the first rotating electrical machine and is electrically connected to the winding;
The internal combustion engine is connected to the rotor so as to transmit driving force to each other;
When the temperature of the cooling liquid is lower than a third predetermined temperature, the control unit energizes the rotor via the brush for starting the internal combustion engine using the rotational driving force of the rotor. Not implemented,
The vehicle control apparatus, wherein the third predetermined temperature is a temperature not lower than the first predetermined temperature and lower than the second predetermined temperature.   The vehicle control device according to claim 4, wherein the control unit heats the cooling liquid by the heating device when a temperature of the cooling liquid is lower than the third predetermined temperature.

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