CN212604474U - Drive system for a motor vehicle and motor vehicle comprising same - Google Patents
Drive system for a motor vehicle and motor vehicle comprising same Download PDFInfo
- Publication number
- CN212604474U CN212604474U CN202020141841.5U CN202020141841U CN212604474U CN 212604474 U CN212604474 U CN 212604474U CN 202020141841 U CN202020141841 U CN 202020141841U CN 212604474 U CN212604474 U CN 212604474U
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- rectifier
- coolant
- coolant path
- cooling
- drive system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The utility model relates to a motor vehicle that is used for actuating system of motor vehicle and includes it. The drive system has: an electric machine; a rectifier having one or more semiconductor switches connected to the electric machine; a common cooling device for cooling the electric machine and the rectifier, the cooling device having a coolant guide by means of which coolant can be first guided through the rectifier and from there through the electric machine, the coolant guide having: a first rectifier coolant path for cooling a top side of the rectifier of the semiconductor switch covered by the protective layer or protective material and designed such that the coolant can come into direct contact with the protective layer or protective material when flowing through the first rectifier coolant path; and a second rectifier coolant path disposed in parallel with the first rectifier coolant path for cooling a bottom side of the rectifier opposite the top side, the second rectifier coolant path extending through the cooling body of the rectifier.
Description
Technical Field
The present invention relates to a drive system for a motor vehicle, having an electric machine, a rectifier connected to the electric machine, and a common cooling device for cooling the electric machine and the rectifier, wherein the cooling device has a coolant guide, by means of which coolant can be first guided through the rectifier and from there through the electric machine. The invention also relates to a motor vehicle having such a drive system. The invention also relates to a method for cooling a drive system of a motor vehicle, the drive system having: an electric machine; a rectifier connected to the electric machine, the rectifier having one or more semiconductor switches; and a common cooling device for cooling the electric machine and the rectifier, wherein the cooling device has a coolant guide by means of which coolant is first guided through the rectifier and from there through the electric machine.
Background
Such a drive system with an electric machine, a rectifier and a common cooling device is known, for example, from DE 102015220852 a 1. The same coolant is used in the cooling device for cooling the rectifier and for cooling the electric machine. The coolant flows first through the coolant path of the rectifier and subsequently through the coolant path of the electric machine. The coolant flows around the semiconductor switches of the rectifier on both sides in order to cool these semiconductor switches from both sides.
In such drive systems, it has proven disadvantageous: particles carried by the coolant may deposit on the semiconductor switches of the rectifier. For example, if these particles are conductive, they may cause an undesirable short circuit and cause the drive system to malfunction.
SUMMERY OF THE UTILITY MODEL
Against this background, it is an object of the invention to improve the usability of a drive system.
This object is achieved by a drive system for a motor vehicle, having: an electric machine; a rectifier connected to the electric machine, the rectifier having one or more semiconductor switches; and a common cooling device for cooling the electric machine and the rectifier, wherein the cooling device has a coolant guide, by means of which coolant can be first guided through the rectifier and from there through the electric machine, wherein the coolant guide has
-a first rectifier coolant path for cooling a top side of semiconductor switches of the rectifier, wherein the semiconductor switches are covered by a protective layer or protective material, and the first rectifier coolant path is designed such that the coolant can make direct contact with the protective layer or protective material when flowing through the first rectifier coolant path; and
-a second rectifier coolant path arranged in parallel with the first rectifier coolant path for cooling a bottom side of the rectifier opposite the top side, the second rectifier coolant path extending through a cooling body of the rectifier.
According to the utility model provides a: the rectifier, in particular the semiconductor switches of the rectifier, are cooled from a plurality of sides. The top side of the semiconductor switch may be cooled via the first rectifier coolant path. The semiconductor switch is covered by a protective layer or protective material, so that the electrically conductive surface of the semiconductor switch is effectively protected from adhesion by particles carried in the coolant. The bottom side of the semiconductor switch can be cooled via a second rectifier coolant path extending through the cooling body. On the one hand, the cooling body can shield the semiconductor switches from the coolant, so that even particles carried in the coolant on the underside cannot reach the electrically conductive surfaces of the semiconductor switches. On the other hand, the cooling body may additionally form a holding element for the semiconductor switch. In summary, in the drive system according to the invention, the occurrence of undesired short circuits due to particle deposition is prevented, thereby improving the usability of the drive system.
The heat sink is preferably connected to a conductor track plate, in particular a circuit board, on which the semiconductor switch is arranged.
According to one advantageous embodiment, it is provided that: the protective layer or material is provided with an epoxy resin. The epoxy may form a thermally conductive, electrically insulating protection for the semiconductor switch. Preferably, the protective layer or the protective material is formed by a casting method, so that the effort for protecting the semiconductor components can be kept low.
It is advantageous to have a design of the first valve which can be controlled for regulating the volume flow in the first rectifier coolant path and the second rectifier coolant path. The first valve may have an adjustable flow cross section for the first rectifier coolant path and the second rectifier coolant path. Alternatively, it is possible to provide: the drive system has two first valves, wherein the volume flow in the first rectifier coolant path can be regulated by one of the valves and the volume flow in the second rectifier coolant path can be regulated by the other of the valves. Further alternatively, the first rectifier coolant path and the second rectifier coolant path may originate from branch positions designed without valves. In such a configuration, the volume flow may not be regulated, but rather may be regulated by itself.
According to an advantageous embodiment of the invention, it is provided that: the first rectifier coolant path and the parallel second rectifier coolant path are connected with a third rectifier coolant path at a connection location such that coolant flowing through the first rectifier coolant path and the second rectifier coolant path can be directed into the third rectifier coolant path. In the third rectifier coolant path, the coolant may converge together and be directed collectively in the direction of the electric machine. Such a design with a connection point at which the first rectifier coolant path and the second rectifier coolant path converge brings the following advantages: the distribution of the coolant in the first and second rectifier coolant paths can be designed independently of the design of the coolant guiding device in the region of the electric machine, in particular independently of the distribution of the coolant guiding device in the region of the electric machine in the form of parallel paths.
In a preferred embodiment, the coolant conducting device has a first machine coolant path for cooling a stator of the electric machine and a second machine coolant path arranged in parallel with the first machine coolant path for cooling a rotor of the electric machine. In this way, not only the rectifier but also the stator and the rotor of the electric machine can be cooled by the same cooling device. Preferably, the stator coolant path is designed such that coolant can flow around the windings of the stator. Such cooled windings are also referred to as directly cooled windings.
In this connection, it has proven advantageous: the drive system includes a second valve that can be controlled for regulating the volumetric flow in the first machine coolant path and the second machine coolant path. The second valve may have adjustable flow cross-sections for the first machine coolant path and the second machine coolant path. Alternatively, it is possible to provide: the drive system has two second valves, wherein the volume flow in the first machine coolant path can be regulated by one of the valves and the volume flow in the second machine coolant path can be regulated by the other of the valves. Further alternatively, the first machine coolant path and the second machine coolant path may originate from branch positions designed without valves. In such a configuration, the volume flow may not be regulated, but rather may be regulated by itself.
Preferably, the second valve is adjusted in such a way that the volume flow through the first machine coolant path for cooling the stator is greater than the volume flow through the second machine coolant path for cooling the rotor. Such a regulation of the second valve is advantageous in electric machines in which a greater power loss is released in the stator than in the rotor. Since the volume flow in the region of the stator is greater, more heat can be removed from the stator.
According to an alternative preferred embodiment, the coolant guide has a common coolant path for cooling the stator and the rotor in the region of the electric machine. The common coolant path may be designed such that the coolant may flow first through the rotor and then through the stator. However, the common coolant path is preferably designed such that the coolant can flow first through the rotor and then through the stator, so that it flows first through the region of the electric machine (here the rotor) in which less power loss is released.
Another subject of the invention is a motor vehicle having a drive system as described above.
The same advantages as already described in connection with the drive system can be achieved in this motor vehicle.
Preferably, the drive system forms a traction drive of the motor vehicle, in particular a front wheel drive, a rear wheel drive, an all-wheel drive or a hub drive.
According to one advantageous embodiment, the motor vehicle comprises a transmission coupled to the rotor of the electric machine. In the design of a motor vehicle with a transmission, the cooling device of the drive train is preferably designed independently of the cooling device of the transmission. Further, the transmission may be coupled with the combustion engine. In the design of a motor vehicle with a combustion engine, the cooling device of the drive train is preferably designed independently of the cooling circuit of the combustion engine.
Another subject of the invention is a method for cooling a drive system of a motor vehicle, the drive system having: an electric machine; a rectifier connected to the electric machine, the rectifier having one or more semiconductor switches; and a common cooling device for cooling the electric machine and the rectifier, wherein the cooling device has a coolant guide by which coolant is first guided through the rectifier and from there through the electric machine, wherein the coolant in the coolant guide is caused to flow
-is guided in a first rectifier coolant path for cooling the top side of the rectifier, wherein the semiconductor switches are covered by a protective layer or protective material and the first rectifier coolant path is designed such that the coolant makes direct contact with the protective layer or protective material when flowing through the first rectifier coolant path; and
-is guided in a second rectifier coolant path arranged in parallel with the first rectifier coolant path for cooling a bottom side of the rectifier opposite the top side, the second rectifier coolant path extending through a cooling body of the rectifier.
In this way the same advantages as already described in connection with the drive system can be achieved.
According to an advantageous embodiment of the method, it is provided that: the coolant in the coolant guiding device is guided in a first machine coolant path for cooling a stator of the electric machine and in a second machine coolant path for cooling a rotor of the electric machine, which is arranged in parallel with the first machine coolant path. By thus conducting the coolant through the rotor and the stator in parallel, the disadvantages of a series-connection conducting can be avoided. That is, if the coolant is first directed through the stator and then through the rotor, a relatively large coolant temperature is generated in the rotor, thereby possibly reducing the efficiency of the machine. Conversely, if the same coolant flows first through the rotor and then through the stator, it may lead to an increase in pressure on the radial shaft seal ring, with a consequent increased risk of frictional losses and damage to the seal.
In this connection, it is advantageous: the first volume flow in the first machine coolant path is set to be greater than the second volume flow in the second machine coolant path, in particular by means of a valve that can be controlled. Since the volume flow in the region of the stator is greater, more heat can be removed from the stator.
In addition to the advantageous embodiments described above, the advantageous embodiments described in conjunction with the drive system according to the invention can alternatively or additionally also be used individually or in combination in the method.
Drawings
Further details and advantages of the invention shall be explained below with the aid of embodiments shown in the drawings. In the drawings:
fig. 1 shows a motor vehicle with a drive system in a schematic illustration;
fig. 2 shows a drive system of a motor vehicle according to fig. 1 in a schematic illustration; and
fig. 3 shows a section of the drive system according to fig. 2 along the section line III-III'.
Detailed Description
Fig. 1 shows a motor vehicle 1 designed as an electric vehicle, which has a drive system 2 according to the invention. The drive system 2 is designed as a traction drive of the motor vehicle 1 and drives one or more wheels of the motor vehicle. One component of the drive system 2 is an energy store 3, which can be designed, for example, as a battery, a rechargeable battery or an ultracapacitor (super capacitor). The drive system 2 further comprises a rectifier 4 and an electric machine 5.
The rectifier 4 is designed as an inverter and has a dc voltage side and an ac voltage side. The rectifier 4 is connected on its dc voltage side to the energy store 3. The rectifier 4 is connected on its ac voltage side to an electric machine 5. The rectifier 4 comprises an intermediate circuit capacitor 4.1 on the direct voltage side. The rectifier further comprises a plurality of semiconductor switches 4.2, which can be designed, for example, as MOSFETs, IGBTs or bipolar transistors. A freewheeling diode 4.3 is arranged in parallel with these semiconductor switches 4.2.
The illustration in fig. 2 shows a drive system 2, which can be used, for example, in the vehicle 1 according to fig. 1. The drive system 2 comprises a cooling device 6 which is designed as a common cooling device for the rectifier 4 and the electric machine 5. The cooling device 6 comprises a coolant guiding device 7, by means of which coolant can be first guided through the rectifier 4 and from the rectifier 4 through the electric machine 5. Preferably, a poorly or non-conductive cooling medium (e.g., oil) is used as the coolant.
The coolant guide has a first rectifier coolant path 11 in the region of the rectifier 4 for cooling the top side of the semiconductor switch 4.2. In order to protect the semiconductor switches 4.2 from undesired contamination, they are covered by a protective layer 9 or protective material. The protective layer 9 is formed of epoxy resin. The semiconductor switch 4.2 is fastened to the heat sink 8. The first rectifier coolant path 11 is designed such that the coolant can come into direct contact with the protective layer 9 or the protective material when flowing through the first rectifier coolant path 11.
A second rectifier coolant path 12 is arranged in parallel with the first rectifier coolant path 11, which second rectifier coolant path serves to cool a bottom side of the rectifier 4 (in particular the semiconductor switch 4.2) opposite the top side. The second rectifier coolant path 12 extends through the cooling body 8 of the rectifier 4, so that even the coolant flowing in the coolant path 12 may not come into direct contact with the semiconductor switches. The flow of coolant is indicated in fig. 2 by arrows within the respective rectifier coolant paths 11, 12. The second rectifier coolant path 12 thus enables indirect cooling of the rectifier 4 above the cooling body 8.
For regulating the volume flow in the first rectifier coolant path 11 and the second rectifier coolant path 12, the cooling device 6 has a first valve 16 which can be controlled. The first rectifier coolant path 11 and the parallel second rectifier coolant path 12 open into the third rectifier coolant path 13 at a connection point 18. Thus, the coolant flowing through the first rectifier coolant path 11 and the second rectifier coolant path 12 is mixed and guided through the third rectifier coolant path 13 in the direction of the electric machine 5.
The coolant guide 7 also has two parallel coolant paths 14, 15 in the region of the electric machine 5. The first machine coolant path 14 is provided in the region of the stator for cooling the stator 5.1 of the electric machine 5. A second machine coolant path 15, which is arranged in parallel with the first machine coolant path 14, extends through the rotor 5.2 of the electric machine and enables independent cooling of the rotor 5.2. The first machine coolant path 14 is designed such that coolant can flow through the windings of the stator, in particular of the stator 5.1. In this regard, there is direct cooling of the stator windings.
The distribution of the volume flow in the first machine coolant path 14 and the second machine coolant path 15 can be adjusted independently of the distribution of the volume flow in the first rectifier coolant path 11 and the second rectifier coolant path 12. For regulating the volume flow in the first machine coolant path 14 and the second machine coolant path 15, the drive system 2 comprises a second valve 17 which can be controlled. According to this embodiment, the first volume flow in the first machine coolant path 14 is adjusted to be greater than the second volume flow in the second machine coolant path 15.
The illustration in fig. 3 shows a section through the drive system 2 along the section line III-III' according to fig. 2. It can be seen that the stator 5.1 and the rotor 5.2 are separated by a sleeve 19. The sleeve is designed in a fluid-tight manner and seals the stator 5.1, through which the coolant flows, against the rotor 5.2.
In the drive system 2 shown above, a method for cooling the drive system 2 may be used in which the coolant in the coolant guiding device 7 is caused to: is guided in a first rectifier coolant path 11 for cooling the top side of the rectifier 4, wherein the semiconductor switches 4.2 are covered by a protective layer 9 or protective material, and the first rectifier coolant path 11 is designed such that the coolant makes direct contact with the protective layer 9 or protective material when flowing through the first rectifier coolant path 11; and in a second rectifier coolant path 12 arranged in parallel with the first rectifier coolant path 11 for cooling a bottom side of the rectifier 4 opposite the top side, which extends through the cooling body 8 of the rectifier 4. The occurrence of undesired short circuits due to particle deposition is prevented in the drive system 2, thereby improving the usability of the drive system 2.
Claims (7)
1. A drive system for a motor vehicle, the drive system having: an electric machine (5); a rectifier (4) connected to the electric machine (5), the rectifier having one or more semiconductor switches (4.2); and a common cooling device (6) for cooling the electric machine (5) and the rectifier (4), wherein the cooling device (6) has a coolant guide (7) by means of which coolant can be first guided through the rectifier (4) and from the rectifier (4) through the electric machine (5),
it is characterized in that the preparation method is characterized in that,
the coolant guide device (7) has
-a first rectifier coolant path (11) for cooling a top side of the semiconductor switches (4.2) of the rectifier (4), wherein the semiconductor switches (4.2) are covered by a protective layer (9) or protective material, and the first rectifier coolant path (11) is designed such that the coolant can make direct contact with the protective layer (9) or protective material when flowing through the first rectifier coolant path (11); and
-a second rectifier coolant path (12) arranged in parallel with the first rectifier coolant path (11) for cooling a bottom side of the rectifier (4) opposite the top side, the second rectifier coolant path extending through a cooling body (8) of the rectifier (4).
2. Drive system according to claim 1, characterized in that the protective layer (9) or protective material is provided with an epoxy resin.
3. Drive system according to claim 1 or 2, characterized by a first valve (16) which can be controlled for regulating the volume flow in the first rectifier coolant path (11) and the second rectifier coolant path (12).
4. Drive system according to claim 1 or 2, characterized in that the first rectifier coolant path (11) and the parallel second rectifier coolant path (12) are connected with a third rectifier coolant path (13) at a connection location (18) such that coolant flowing through the first and second rectifier coolant paths (11, 12) can be conducted into the third rectifier coolant path (13).
5. Drive system according to claim 1 or 2, characterized in that the coolant guiding device (7) has a first machine coolant path (14) for cooling a stator (5.1) of the electric machine (5) and a second machine coolant path (15) arranged in parallel with the first machine coolant path (14) for cooling a rotor (5.2) of the electric machine (5).
6. Drive system according to claim 5, characterized by a second valve (17) which can be controlled for regulating the volume flow in the first machine coolant path (14) and the second machine coolant path (15).
7. A motor vehicle, characterized in that it has a drive system according to any one of claims 1 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019103735.2A DE102019103735B4 (en) | 2019-02-14 | 2019-02-14 | Drive system for a motor vehicle with a common cooling device for cooling an electrical machine and a converter |
| DE102019103735.2 | 2019-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212604474U true CN212604474U (en) | 2021-02-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020141841.5U Active CN212604474U (en) | 2019-02-14 | 2020-01-21 | Drive system for a motor vehicle and motor vehicle comprising same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN212604474U (en) |
| DE (1) | DE102019103735B4 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021106599A1 (en) * | 2021-03-18 | 2022-09-22 | Man Truck & Bus Se | Liquid-cooled inverter for controlling an electric drive motor of a vehicle |
| DE102021111088A1 (en) | 2021-04-29 | 2022-11-03 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Drive system for an electric vehicle and electric vehicle |
| DE102021128947A1 (en) | 2021-11-08 | 2023-05-11 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Pulse-controlled inverter and drive train |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103155381B (en) * | 2010-11-12 | 2016-04-20 | 川崎重工业株式会社 | The cooling structure of motor vehicle |
| JP2014050118A (en) * | 2012-08-29 | 2014-03-17 | Hitachi Ltd | Electric circuit device and method for manufacturing electric circuit device |
| DE102014208499A1 (en) * | 2014-05-07 | 2015-11-12 | Siemens Aktiengesellschaft | Cooling circuit with bypass flow path for cooling an inverter interior |
| US20160164378A1 (en) * | 2014-12-04 | 2016-06-09 | Atieva, Inc. | Motor Cooling System |
| JP6446280B2 (en) * | 2015-01-28 | 2018-12-26 | 日立オートモティブシステムズ株式会社 | Electronic equipment |
| JP2017047698A (en) * | 2015-08-31 | 2017-03-09 | Ntn株式会社 | Electric automobile |
| DE102015220852A1 (en) * | 2015-10-26 | 2017-04-27 | Robert Bosch Gmbh | Electric machine |
| JP6680263B2 (en) * | 2017-05-19 | 2020-04-15 | トヨタ自動車株式会社 | Hybrid vehicle drive |
-
2019
- 2019-02-14 DE DE102019103735.2A patent/DE102019103735B4/en active Active
-
2020
- 2020-01-21 CN CN202020141841.5U patent/CN212604474U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019103735B4 (en) | 2021-06-10 |
| DE102019103735A1 (en) | 2020-08-20 |
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