CN113783342A - Oil-cooled electric driving system for testing and testing method thereof - Google Patents
Oil-cooled electric driving system for testing and testing method thereof Download PDFInfo
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- CN113783342A CN113783342A CN202111080831.0A CN202111080831A CN113783342A CN 113783342 A CN113783342 A CN 113783342A CN 202111080831 A CN202111080831 A CN 202111080831A CN 113783342 A CN113783342 A CN 113783342A
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 45
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims description 27
- 210000001503 joint Anatomy 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 9
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- 230000006835 compression Effects 0.000 abstract description 5
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- 238000010998 test method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
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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
-
- 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
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention provides an oil-cooling electric drive system for testing and a testing method thereof.A resilient piece is arranged on an oil ring and an end cover, so that the cooperation between the oil ring and the end cover is elastic compression fit, the tightness of the oil ring can be ensured to prevent leakage, an acrylic shell with poor strength and a 3D printing oil ring can be ensured to be intact, and the oil ring can be prevented from being damaged due to rigid connection in the prior art; the rotor is driven to rotate by the aid of an external driving piece, and the rotor is not magnetized and does not participate in driving, so that assembly difficulty of components such as the rotor and the stator can be reduced; when the stator oil way needs to be cut off, the oil plug is radially inserted into the first oil guide oil way and connected with the second oil guide oil way; when the stator oil way needs to be conducted, the oil plug is fixedly arranged on the outer side of the first oil guide oil way in the radial direction so as to meet the test requirement.
Description
Technical Field
The invention relates to the technical field of motors, in particular to an oil-cooled electric driving system for testing and a testing method thereof.
Background
In the development stage of the electric drive system, oil passages of the electric drive system need to be verified, and lubrication conditions of parts such as a stator, a rotor and a bearing need to be observed. The prior art generally adopts the homotypic design of aluminum hull model machine, only changes the material into transparent ya keli, realizes better observation result, nevertheless because transparent casing of yakeli has intensity low, resistant difference in temperature, precision low scheduling problem, in the testing process, takes place to damage very easily and influences the test result.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide an oil-cooled electric drive system for testing and a testing method thereof, which can ensure the strength requirement of a shell on the premise of better observation effect of measurement results.
The invention discloses an oil-cooled electric drive system for testing, which comprises a shell, a cylindrical stator arranged in the shell and a rotor arranged in the center of the stator, wherein the cylindrical stator is arranged in the shell; the shell is made of transparent acrylic materials; the driving part is arranged outside the shell; one end or two ends of the rotor penetrate through the shell, one end of the rotor is connected with the driving piece, and the driving piece drives the rotor to rotate; the stator is provided with a first axial oil guide way; cooling oil enters the windings at the two ends of the stator through the first oil guide oil way and the second oil guide oil way in sequence to cool the windings, and enters the bearing through the first oil guide oil way and the second oil guide oil way in sequence to cool the bearing; the shell comprises an end cover, an oil ring is detachably connected to the end face of the stator, and the end cover is arranged on the outer side of the oil ring; the end cover is provided with an oil ring, the oil ring is provided with a first butt joint block, the end cover is provided with a second butt joint block at the position corresponding to the first butt joint block, and the first butt joint block and/or the second butt joint block are/is provided with elastic pieces, so that the end cover and the oil ring are in elastic press fit.
Preferably, the number of the first butt-joint blocks and the number of the second butt-joint blocks are even, and the first butt-joint blocks and the second butt-joint blocks are symmetrically arranged on the oil ring and the end cover respectively.
Preferably, the number of the first butt-joint block/the second butt-joint block is equal to or greater than two, and the first butt-joint block/the second butt-joint block are respectively and uniformly arranged on the oil ring and the end cover.
Preferably, the oil ring includes a first cover, and a first connecting edge of the outer ring of the first cover, the first connecting edge axially protrudes from the first cover, and the first butt block is disposed on the first cover and connected to the first connecting edge; the end cover is provided with a second cover and a second connecting edge of an outer ring of the second cover, the second connecting edge axially protrudes out of the second cover, and the second butt joint block is arranged on the second cover and connected with the first connecting edge.
Preferably, the end cover and the oil ring are provided with central holes, the rotor penetrates through the central holes, and the second butt joint block is further connected with the central holes of the end cover.
Preferably, the driving member is a motor, and the motor is connected with the rotor through a coupler.
Preferably, a controller is arranged on the motor, and the controller controls and records the rotating speed of the motor.
Preferably, the housing is further provided with an oil plug, and the oil plug is radially inserted into the first oil guide path and connected with the second oil guide path, so that cooling oil in the first oil guide path cannot enter the windings at two ends of the stator through the second oil guide path; the oil plug is fixedly arranged at the outer side of the first oil guide oil way in the radial direction, so that cooling oil in the first oil guide oil way enters the windings at two ends of the stator through the second oil guide oil way; one end or two ends of the rotor are arranged on the shell through bearings, and an oil seal is arranged between the rotor shaft and the shell, so that the rotor is dynamically sealed with the shell when rotating; one end of the third oil guide oil way is communicated with the first oil guide oil way, and the other end of the third oil guide oil way is communicated with the bearing; the radial dimension of the oil plug is smaller than that of the first oil guide oil way, so that cooling oil in the first oil guide oil way can flow to the bearing when the oil plug is radially inserted into the first oil guide oil way and connected with the second oil guide oil way.
The invention also discloses a test method of the oil-cooled electric drive system, which comprises the following steps: oil is injected into the first oil guide oil way through an oil pump; the oil plug is fixedly arranged on the outer side of the first oil guide oil way in the radial direction, so that cooling oil in the first oil guide oil way enters windings at two ends of the stator through the second oil guide oil way, and the driving piece is closed; observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump through the transparent shell; injecting oil into the first oil guide oil way through an oil pump, radially inserting the oil plug into the first oil guide oil way and connecting the oil plug with the second oil guide oil way so that cooling oil in the first oil guide oil way cannot enter windings at two ends of the stator through the second oil guide oil way, and starting the driving piece to drive the rotor to rotate; observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump and the driving piece through the transparent shell; injecting oil into the first oil guide oil way through an oil pump, radially and fixedly arranging the oil plug on the outer side of the first oil guide oil way so that cooling oil in the first oil guide oil way enters windings at two ends of the stator through the second oil guide oil way, and starting the driving piece to drive the rotor to rotate; and observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump and the driving piece through the transparent shell.
Preferably, before the above steps are performed, the method further comprises: the oil pump is closed, the driving piece is started, the operating data of the driving piece are obtained through the controller, the operating data are compared with given data, and the operating data are confirmed to be located in a preset threshold range of the given data; and closing the driving piece, radially and fixedly arranging the oil plug on the outer side of the first oil guide oil way so that the cooling oil in the first oil guide oil way enters the windings at the two ends of the stator through the second oil guide oil way, starting the oil pump, and determining that the oil pump has different circulation states of the cooling oil at different rotating speeds.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the elastic pieces are arranged on the oil ring and the end cover, so that the matching between the oil ring and the end cover is elastic compression matching, the tightness of the oil ring and the end cover can be ensured, leakage can be prevented, the acrylic shell with poor strength can be ensured to be intact, and the acrylic shell can be prevented from being damaged due to rigid connection in the prior art;
2. the rotor is driven to rotate by the aid of an external driving piece, and the rotor is not magnetized and does not participate in driving, so that assembly difficulty of components such as the rotor and the stator can be reduced; the peripheral driving piece can accurately acquire the rotating speed and other parameters of the rotor, so that the recording is convenient; the phenomenon of oil temperature rise during autonomous driving is avoided, the risk of strength reduction of the acrylic shell at high temperature is further reduced, higher rotating speed and continuous operation can be realized, and data acquisition and verification are facilitated;
3. when the stator oil way needs to be cut off, the oil plug is radially inserted into the first oil guide oil way and connected with the second oil guide oil way; when the stator oil way needs to be conducted, the oil plug is fixedly arranged on the outer side of the first oil guide oil way in the radial direction so as to meet the test requirement; usually, the oil plug adopts long and short bolts, and the circulation and the partition of the stator oil circuit can be changed by replacing the bolts; the length of the telescopic bolt can be adjusted without replacing the bolt, so that the on-off of the stator oil way can be changed.
Drawings
FIG. 1 is a schematic diagram of a test oil-cooled electric drive system provided by the present invention;
FIG. 2 is a schematic connection diagram of a first docking block and a second docking block provided by the present invention;
FIG. 3 is a schematic structural view of an end cap provided by the present invention;
FIG. 4 is a schematic structural view of an oil ring provided by the present invention;
FIG. 5 is a radial cross-sectional view of FIG. 1 provided with the present invention;
FIG. 6 is a schematic structural view of the oil cooling drive system for testing according to the present invention, wherein the oil cooling drive system is radially fixed outside the first oil guiding passage;
FIG. 7 is a radial cross-sectional view of FIG. 6 provided by the present invention;
FIG. 8 is a schematic diagram of a test structure of the oil-cooled electric drive system provided by the present invention;
fig. 9 is a flowchart of a testing method of the oil-cooled electric drive system provided by the invention.
Wherein: the test device comprises a shell 1, a stator 2, a rotor 3, an end cover 4, an oil ring 5, an oil plug 6, an elastic part 7, a first butt joint block 8, a first front cover 9, a first connecting edge 10, a second butt joint block 11, a second front cover 12, a second connecting edge 13, an oil-cooling electric drive system 14, a coupler 15, a driving part 16, a speed reducer 17, an oil pump 18, a fixing tool 19, a fixing bolt 20, a table board 21, a low-voltage power supply 22, an upper computer 23, a tested part 24 and a connecting shaft 25.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to the attached drawing 1, the invention discloses an oil-cooled electric drive system 14 for testing, which is used for testing the oil-cooled electric drive system 14 in various aspects of oil path conduction effects, and comprises a shell 1, a cylindrical stator 2 arranged in the shell 1 and a rotor 3 arranged in the center of the stator 2. The structure of the stator 2 and the rotor 3, which is the main functionality of the oil-cooled electric drive system 14, is usually the same as that of the applied oil-cooled electric drive system 14, but other auxiliary structures, such as the housing 1, need to be designed to be transparent, so that the oil circuit conduction condition of the stator 2 and the rotor 3 and the oil throwing condition of the rotor 3 can be accurately and visually observed in the test process. According to the invention, the shell 1 is designed to be made of transparent acrylic material, so that the observation is convenient, the processing is simple, and the use convenience is better than that of common glass.
Because the machining precision of the acrylic material is limited, the oil ring 5 is usually of a 3D printing structure and has poor precision, and in the testing stage of the oil-cold electric driving system 14, the electric driving bridge is not required to be electrified and rotated, and only the oil circuit effect is tested, one end or two ends of the rotor 3 extend out of the shell to be connected with a driving piece outside the shell 1, and the rotor 3 is dragged to rotate through the driving piece, so that the oil throwing condition of the rotor 3 is observed. Because do not need the drive of 3 magnetic conduction of rotor, the assembly degree of difficulty between rotor 3, stator 2 and other subassemblies can significantly descend to satisfy the precision condition of inferior gram force material casing 1 and 3D printed oil ring 5. The situation that the normal electric drive axle is adopted for driving, the assembly precision is high, and the situation that the assembly precision cannot be met actually is avoided.
In addition, still because the machining precision of ya keli material is limited, and oil ring 5 adopts 3D printing structure usually, and the precision is also relatively poor, makes the cooperation of end cover 4 of casing 1 and other structure (for example oil ring) have the tolerance either for the press fit or for the clearance fit, and the clearance fit will existing probably lead to the leakage of the cooling oil in stator 2 rotor 3, and this is not allowed, so I adopt press fit. And because the strength of the acrylic material is limited, when the casing 1 has rigid connection force and is damaged when the pressing fit is adopted, the elastic part 7 is adopted in the connection of the casing 1 and other structures, so that the matching of the casing 1 and other structures is elastic compression matching, the tightness can be ensured to prevent leakage, the integrity of the acrylic shell with poor strength can be ensured, and the damage caused by rigid connection can be prevented.
Specifically, referring to fig. 1-4, the housing 1 includes an end cap 4, an oil ring 5 is detachably connected to an end surface of the stator 2, the end cap 4 is disposed outside the oil ring 5, and the end cap 4 is fixedly connected to the oil ring 5. The side of the oil ring 5 facing the end cover 4 is provided with a first butt-joint block 8, the side of the end cover 4 facing the oil ring 5 is provided with a second butt-joint block 11 corresponding to the first butt-joint block 8, the oil ring 5 and the end cover 4 are in contact connection with each other through the first butt-joint block 8 and the second butt-joint block 11, and the rigid connection is realized, and the elastic piece 7 is arranged on one of the first butt-joint block 8 and the second butt-joint block 11 or on the first butt-joint block 8 and the second butt-joint block 11 at the same time, so that the end cover 4 is arranged between the end cover 4 and the oil ring 5 and is in elastic press fit.
Usually, the elastic element 7 is arranged on only one of the first butt-joint block 8 and the second butt-joint block 11, because the elastic element 7 is arranged on both the first butt-joint block 8 and the second butt-joint block 11, which may cause the mutual connection to be misaligned and further cause the loose connection.
The elastic member 7 is usually disposed by dispensing, and the elastic member 7 may be made of an elastic material such as rubber.
Preferably, in order to ensure the stable connection relationship between the end cover 4 and the oil ring 5, the number of the first butt-joint blocks 8 and the second butt-joint blocks 11 should be even and symmetrically arranged on the oil ring 5 and the end cover 4 respectively, so that the connection force can be uniformly distributed on the oil ring 5 and the end cover 4. For example 8 as shown in fig. 3-4.
Preferably, the number of the first butt-joint blocks 8 and the second butt-joint blocks 11 is not even, but is equal to or greater than two, and the first butt-joint blocks and the second butt-joint blocks are uniformly arranged on the oil ring 5 and the end cover 4 respectively, so that the uniform distribution of the connecting force on the oil ring 5 and the end cover 4 can be ensured. For example three.
The end cover 4 comprises a left end cover and a right end cover, and a left oil ring and a right oil ring are respectively arranged at the left end and the right end of the stator core.
Specifically, the left oil ring in the left end cover is provided with 2 or more than 2 first butt-joint blocks 8, each left oil ring is provided with a corresponding number of second butt-joint blocks 11 facing the left end cover, an elastic piece 7 is arranged between the first butt-joint blocks 8 and the second butt-joint blocks 11, and the elastic pieces 7 are elastically in compression fit.
The inner surface of the right end cover is provided with 2 or more than 2 right end cover flanges towards the right oil ring, each right oil ring is provided with a corresponding number of second butt-joint blocks 11 towards the right end cover, an elastic piece 7 is arranged between the first butt-joint block 8 and the second butt-joint blocks 11, and the elastic piece 7 is elastically matched in a compression mode.
The free height of the elastic piece 7 is larger than the gap between the first butt joint block 8 and the second butt joint block 11, when the stator core is assembled, the first butt joint block 8 of the left end cover presses the left oil ring on the left side of the stator core through the elastic piece 7, and the first butt joint block 8 of the right end cover presses the right oil ring on the right side of the stator core through the elastic piece 7.
Preferably, the oil ring 5 includes a first cover 9 and a first connecting edge 10 outside the first cover 9, the first connecting edge 10 axially protrudes from the first cover 9, and a first butt block is disposed on the first cover 9 and connected to the first connecting edge 10, so that the connecting force is borne by not only the first cover 9 but also the first cover 9 and the first connecting edge 10, and the strength of the oil ring 5 structure is more stable.
The end cover 4 is also provided with a second cover 12 and a second connecting edge 13 at the outer ring of the second cover 12, the second connecting edge 13 axially protrudes out of the second cover 12, and a second butt-joint block is arranged on the second cover 12 and connected with the first connecting edge 10, so that the connecting force is borne by the second cover 12 alone, but borne by the second cover 12 and the second connecting edge 13 simultaneously, and the strength of the end cover structure is more stable.
Preferably, the end cover is provided with a central hole, the rotating shaft of the rotor 3 passes through the central hole, and the second butt joint block is further connected with the central hole, so that the center and the outer side of the end cover 4 are connected, and the connection is more stable.
Preferably, the driving member is a motor, the motor is connected with the rotor 3 through a coupling, and the external motor drives the rotor 3 to rotate.
Preferably, the motor is provided with a controller, the controller controls and records the rotating speed of the motor, and the oil throwing condition of the rotor 3 at different rotating speeds can be observed by setting different rotating speeds of the motor. The external motor is dragged to rotate, the rotor 3 is prevented from magnetizing to participate in driving, so that the temperature rise of oil liquid can be reduced, higher rotating speed and continuous operation are realized, and data acquisition and verification are facilitated.
Preferably, an oil ring 5 is further disposed between the stator 2 and the housing 1, the oil ring 5 is provided with a central hole, and the rotor 3 passes through the central hole.
Preferably, one end or both ends of the rotor 3 are disposed on the housing 1 through a bearing, and an oil seal is disposed between the rotor shaft and the housing 1 and is usually disposed on the right end cover of the housing 1, so that the rotor 3 is dynamically sealed with the right end cover when rotating. And the bearings are filled with cooling oil, so that the working state of the bearings is ensured to be good.
Preferably, when the oil path oil guiding condition is observed, the stator 2 is positioned outside the rotor 3 and covers the rotor, and after the oil path of the stator 2 is conducted, the oil ring sprays oil to the stator 2 winding, so that the observation of the oil throwing phenomenon of the rotor 3 is influenced, and therefore when the oil throwing effect of the rotor 3 is verified, the oil path of the stator 2 needs to be separated, so that the oil throwing phenomenon of the rotor 3 can be observed more accurately.
Specifically, referring to fig. 1 and fig. 5 to 7, an axial first oil guiding passage is provided on the housing 1, an axial second oil guiding passage is provided on the stator 2, and cooling oil sequentially passes through the first oil guiding passage and the second oil guiding passage and enters the surface of the rotor 3 to cool the rotor.
According to the invention, the oil plug 6 is arranged on the shell 1, the oil plug 6 is radially inserted into the first oil guide oil way and is connected with the second oil guide oil way, and the second oil guide oil way is plugged, so that cooling oil in the first oil guide oil way cannot enter windings at two ends of the stator 2 through the second oil guide oil way, and the oil guide oil way of the stator 2 is blocked. The oil plug 6 is provided with a rubber pad at the contact side of the second oil guide way, so that the sealing performance of the oil plug on the second oil guide way is ensured.
When the stator 2 oil path needs to be conducted, the oil plug 6 is radially and fixedly arranged on the outer side of the first oil guide path and communicated with the first oil guide path and the second oil guide path, so that cooling oil in the first oil guide path enters the windings at two ends of the stator 2 through the second oil guide path.
Preferably, the rotor 3 is arranged on the bearing, and further comprises a third oil guide way, one end of the third oil guide way is communicated with the first oil guide way, and the other end of the third oil guide way is communicated with the bearing, so that cooling oil in the first oil guide way can flow to the bearing to lubricate and cool the bearing, and the working state of the bearing is ensured. The radial dimension of the oil plug 6 is smaller than that of the first oil guide oil way, so that even if the oil plug 6 is radially inserted into the first oil guide oil way and connected with the second oil guide oil way, the cooling oil in the first oil guide oil way can still flow to the bearing, the oil way of the tail bearing cannot be cut off, and the tail bearing cannot be damaged.
Preferably, the oil plug 6 comprises a first oil plug 6 and a second oil plug 6, and the axial length of the first oil plug 6 is greater than that of the second oil plug 6. And a longer first oil plug 6 is radially inserted into the first oil guide oil way to enable the end part of the first oil plug to be connected with the second oil guide oil way, so that cooling oil in the first oil guide oil way can not enter windings at two ends of the stator 2 through the second oil guide oil way, and the separation of the oil way of the stator 2 is realized. And a shorter second oil plug 6 is radially and fixedly arranged on the outer side of the first oil guide oil way to discharge the first oil guide oil way and the second oil guide oil way, so that cooling oil in the first oil guide oil way enters windings at two ends of the stator 2 through the second oil guide oil way, and the discharge of the oil way of the stator 2 is realized. The oil plug 6 of two kinds of differences is selected to be installed to realize the partition and circulation of the oil way of the stator 2, the operation is simple, and the effect is obvious.
Preferably, in another preferred embodiment of the oil plug 6, the oil plug 6 is a telescopic member. The oil plug 6 is radially inserted into the first oil guide oil way in an extending manner and is connected with the second oil guide oil way, so that cooling oil in the first oil guide oil way cannot enter the windings at two ends of the stator 2 through the second oil guide oil way; or the oil plug 6 is shortened and radially fixed on the outer side of the first oil guide way, so that cooling oil in the first oil guide way enters the windings at two ends of the stator 2 through the second oil guide way. In the embodiment, only one oil plug 6 is needed to be installed, and the oil way of the stator 2 can be cut off and circulated by telescopic adjustment.
Furthermore, for flexible oil block 6, including the fixed part that the axial link up with locate the inside pars contractilis of fixed part, pars contractilis stretches out from the fixed part and leads the oil circuit with radial insertion in the first oil circuit and be connected with the second, pars contractilis and fixed part in order to make the fixed part radially set firmly in the outside of first oil circuit of leading. The connection of the expansion part and the fixed part usually adopts a threaded connection to realize the adjustment of the position of the expansion part relative to the fixed part.
Preferably, no matter the telescopic oil plug 6 or the long and short oil plugs 6 with different types, in a preferred embodiment, the outer surface of the oil plug 6 is provided with threads, and the oil plug 6 is connected with the shell 1 through the threads. If the oil plug 6 is long or short, the installation of the oil plug 6 on the shell 1 can be realized directly through the knob long or short oil plug 6. If the telescopic oil plug 6 is adopted, the thread is arranged on the fixed part to fixedly connect the fixed part and the shell 1, and then the up-down position relation between the telescopic part and the fixed part can be directly adjusted.
In addition, due to the adoption of the structure, after the test is finished, the oil plug 6 of the electric drive system for the test is changed into the short oil plug 6, or the telescopic part of the telescopic oil plug 6 is extended and contracted and is arranged in the fixed part, so that the oil path of the stator 2 is circulated, and the electric drive system can be used as an application type electric drive bridge.
Referring to fig. 8-9, the present invention also discloses a method for testing the oil-cooled electric drive system 14, which tests the oil-cooled electric drive system 14. On oil cold electric drive system 14 located test table 21 through fixed frock 19, fixed through fixing bolt 20, oil cold electric drive system 14 one end is passed through speed reducer 17 and is connected oil pump 18, and the rotor 3 of the other end stretches out, is connected with external driving piece 16 through shaft coupling 15, and this driving piece 16 is the dynamometer machine. The oil pump 18 is connected with a tested piece 24 and is connected with a low-voltage power supply 22 and an upper computer 23.
One specific embodiment of a method of testing the oil-cooled electric drive system 14 is provided below.
Firstly, the oil-cold electric drive system 14 is fixed on a fixing tool 19 by a fixing bolt 20, a tested piece 24 and the fixing tool 19 are fixed on a test table surface 21, one end of a connecting shaft 25 is connected with a rotor 3 shaft of the oil-cold electric drive system 14 by a coupler 15, and the other end of the connecting shaft is connected with a shaft of a dynamometer, so that the connecting shaft rotates and does not slide relatively. The measured part 24 is simultaneously centered with the dynamometer shaft. The U-V, V-W of the three-phase high-voltage outgoing line is respectively connected with two voltage channels of the oscilloscope, and is wound by an insulating tape for insulation. The high-voltage line of the oil pump 18 is connected to a low-voltage power supply 22, the voltage of the low-voltage power supply 22 is set to be 12V, and the low-voltage signal of the oil pump 18 is connected to an upper computer 23. After the assembly is finished, about 2L of oil is filled from the oil filling port of the speed reducer.
The specific test process firstly executes a pretest step:
1. and under the power-off state of the oil pump 18, setting the rotating speed of the dynamometer to be 500rpm, recording waveform data of the oscilloscope, storing the waveform data, and confirming that the sample piece and the assembly have no problem by using the waveform data.
2. Oil paths of the stator 2 and the rotor 3 are opened, namely the oil plug 6 is radially and fixedly arranged on the outer side of the first oil guide oil path, so that cooling oil in the first oil guide oil path enters windings at two ends of the stator 2 through the second oil guide oil path; and turning on the power supply of the oil pump 18, setting the rotation speed of the oil pump 18 to be 1000rpm, 2000rpm and 3000rpm, and observing the internal oil injection state of the oil cold-electric drive system 14 without high pressure on the dynamometer side so as to confirm that the oil pump 18 can work normally.
Standing for a period of time until the inner wall of the transparent shell 1 of the oil-cooled electric drive system 14 is in an oil-free state, and then carrying out formal test work:
1. cooling oil is fed through the stator 2, namely the oil plug 6 is radially and fixedly arranged on the outer side of the first oil guide oil way, so that the cooling oil in the first oil guide oil way enters the windings at the two ends of the stator 2 through the second oil guide oil way; the rotor 3 is not rotated, and the dynamometer side is not applied with high pressure, the power supply of the oil pump 18 is turned on, the rotating speeds of the oil pump 18 are set to 1000rpm, 2000rpm and 3000rpm in sequence, and photos or videos are observed and recorded through the transparent shell 1.
2. Cooling oil is cooled through the rotor 3, a channel of the stator 2 is closed, namely the oil plug 6 is radially inserted into the first oil guide oil way and is connected with the second oil guide oil way, so that the cooling oil in the first oil guide oil way cannot enter windings at two ends of the stator 2 through the second oil guide oil way, a power supply of the oil pump 18 is turned on, the rotating speeds of the oil pump 18 are sequentially set to be 500rpm, 1000rpm and 1500rpm, then the rotating speed of the dynamometer (the actual rotating speed of the motor) is adjusted to be 500rpm, 1000rpm, 3000rpm and 5000rpm under the rotating speed of each oil pump 18, and photos or videos are respectively observed and recorded through the transparent shell 1.
3. Oil passages of the stator 2 and the rotor 3 are opened to be communicated, namely the oil plug 6 is radially and fixedly arranged on the outer side of the first oil guide oil passage so that cooling oil in the first oil guide oil passage enters windings at two ends of the stator 2 through the second oil guide oil passage, a power supply of the oil pump 18 is turned on, the rotating speeds of the oil pump 18 are sequentially set to be 500rpm, 1000rpm, 2000rpm and 3000rpm (20L/min), then the rotating speed of the dynamometer (the actual rotating speed of the motor) is adjusted to be 500rpm, 1000rpm, 3000rpm and 5000rpm under the rotating speed of each oil pump 18, and photos or videos are respectively observed and recorded through the transparent shell 1.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
1. The oil-cooled electric drive system for the test is characterized by comprising a shell, a cylindrical stator arranged in the shell and a rotor arranged in the center of the stator; the shell is made of transparent acrylic materials;
the driving part is arranged outside the shell; one end or two ends of the rotor penetrate through the shell, one end of the rotor is connected with the driving piece, and the driving piece drives the rotor to rotate;
the stator is provided with a first axial oil guide way; cooling oil enters the windings at the two ends of the stator through the first oil guide oil way and the second oil guide oil way in sequence to cool the windings;
the shell comprises an end cover, an oil ring is detachably connected to the end face of the stator, and the end cover is arranged on the outer side of the oil ring; the end cover is provided with an oil ring, the oil ring is provided with a first butt joint block, the end cover is provided with a second butt joint block at the position corresponding to the first butt joint block, and the first butt joint block and/or the second butt joint block are/is provided with elastic pieces, so that the end cover and the oil ring are in elastic press fit.
2. The oil-cooled electric drive system according to claim 1, wherein the number of the first butt-joint blocks and the second butt-joint blocks is even, and the first butt-joint blocks and the second butt-joint blocks are symmetrically arranged on the oil ring and the end cover respectively.
3. The oil-cooled electric drive system according to claim 1, wherein the number of the first butt block/the second butt block is equal to or greater than two, and the first butt block/the second butt block is uniformly arranged on the oil ring and the end cover respectively.
4. The oil-cooled electric drive system according to claim 2 or 3, wherein the oil ring includes a first cover, and a first connecting edge of an outer ring of the first cover, the first connecting edge axially protruding from the first cover, the first butting block being provided on the first cover and connected to the first connecting edge;
the end cover is provided with a second cover and a second connecting edge of an outer ring of the second cover, the second connecting edge axially protrudes out of the second cover, and the second butt joint block is arranged on the second cover and connected with the first connecting edge.
5. The oil-cooled electric drive system of claim 4, wherein the end cap, the oil ring are provided with a central bore through which the rotor passes; the second butt-joint block is also connected with the central hole of the end cover.
6. An oil-cooled electric drive system according to claim 1, wherein the drive member is an electric motor, and the electric motor is coupled to the rotor by a coupling.
7. An oil-cooled electric drive system according to claim 1, wherein a controller is provided on the electric motor, the controller controlling and recording the rotational speed of the electric motor.
8. The oil-cooled electric drive system according to claim 1, wherein an oil plug is further disposed on the housing, and the oil plug is radially inserted into the first oil guide passage and connected to the second oil guide passage, so that the cooling oil in the first oil guide passage cannot enter the windings at two ends of the stator through the second oil guide passage; the oil plug is fixedly arranged at the outer side of the first oil guide oil way in the radial direction, so that cooling oil in the first oil guide oil way enters the windings at two ends of the stator through the second oil guide oil way;
one end or two ends of the rotor are arranged on the shell through bearings, and an oil seal is arranged between the rotor shaft and the shell, so that the rotor is dynamically sealed with the shell when rotating; one end of the third oil guide oil way is communicated with the first oil guide oil way, and the other end of the third oil guide oil way is communicated with the bearing; the radial dimension of the oil plug is smaller than that of the first oil guide oil way, so that cooling oil in the first oil guide oil way can flow to the bearing when the oil plug is radially inserted into the first oil guide oil way and connected with the second oil guide oil way.
9. A method for testing an oil-cooled electric drive system, characterized by carrying out the following steps on an oil-cooled electric drive system according to any one of the preceding claims 1 to 8:
oil is injected into the first oil guide oil way through an oil pump; the oil plug is fixedly arranged on the outer side of the first oil guide oil way in the radial direction, so that cooling oil in the first oil guide oil way enters windings at two ends of the stator through the second oil guide oil way, and the driving piece is closed; observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump through the transparent shell;
injecting oil into the first oil guide oil way through an oil pump, radially inserting the oil plug into the first oil guide oil way and connecting the oil plug with the second oil guide oil way so that cooling oil in the first oil guide oil way cannot enter windings at two ends of the stator through the second oil guide oil way, and starting the driving piece to drive the rotor to rotate; observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump and the driving piece through the transparent shell;
injecting oil into the first oil guide oil way through an oil pump, radially and fixedly arranging the oil plug on the outer side of the first oil guide oil way so that cooling oil in the first oil guide oil way enters windings at two ends of the stator through the second oil guide oil way, and starting the driving piece to drive the rotor to rotate; and observing and recording the circulation state of the cooling oil at different rotating speeds of the oil pump and the driving piece through the transparent shell.
10. The method of claim 9, further comprising, prior to performing the steps:
the oil pump is closed, the driving piece is started, the operating data of the driving piece are obtained through the controller, the operating data are compared with given data, and the operating data are confirmed to be located in a preset threshold range of the given data;
and closing the driving piece, radially and fixedly arranging the oil plug on the outer side of the first oil guide oil way so that the cooling oil in the first oil guide oil way enters the windings at the two ends of the stator through the second oil guide oil way, starting the oil pump, and determining that the oil pump has different circulation states of the cooling oil at different rotating speeds.
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| CN202111080831.0A CN113783342A (en) | 2021-09-15 | 2021-09-15 | Oil-cooled electric driving system for testing and testing method thereof |
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| CN202111080831.0A CN113783342A (en) | 2021-09-15 | 2021-09-15 | Oil-cooled electric driving system for testing and testing method thereof |
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| CN203645488U (en) * | 2013-11-14 | 2014-06-11 | 重庆迈兴机电有限责任公司 | An automatic oil injection apparatus used for spraying a magneto rotor |
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Application publication date: 20211210 |