CN112557900A - Test system of oil-cooled motor stator - Google Patents
Test system of oil-cooled motor stator Download PDFInfo
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- CN112557900A CN112557900A CN202011366904.8A CN202011366904A CN112557900A CN 112557900 A CN112557900 A CN 112557900A CN 202011366904 A CN202011366904 A CN 202011366904A CN 112557900 A CN112557900 A CN 112557900A
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- 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
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- Motor Or Generator Cooling System (AREA)
Abstract
The application provides a test system of oil-cooled motor stator includes: the oil-cooled motor stator to be tested is accommodated in the testing container of the testing barrel and is immersed in the oil, and the oil-cooled motor stator is provided with a stator winding and a temperature sensor; the oil temperature control equipment is connected with the testing container of the testing barrel through a pipeline; the inverter variable alternating current power supply is electrically connected with the stator winding and the temperature sensor respectively; the signal acquisition module is electrically connected with the temperature sensor; a DC power supply electrically connected to the inverter; and the upper computer is in communication connection with the oil temperature control equipment, the variable alternating current power supply inverter and the signal acquisition module direct current power supply respectively. The system can be used for well testing the reliability of the insulation failure and the temperature sensor failure of the oil-cooled motor stator.
Description
Technical Field
The application relates to the technical field of automobile detection, in particular to a test system for an oil-cooled motor stator.
Background
The electric automobile industry is developing at a high speed, and the market of electric automobiles in the future will be further expanded as environmental protection measures and environmental policies of various countries become stricter. With the increase of the power density of the motor, the requirement of the field of new energy automobiles on the motor is higher and higher, and the heat dissipation of the motor directly restricts the improvement of the power density of the electric automobile and the electrical and mechanical properties of the motor.
At present, the motor is mainly cooled by a water cooling mode or an oil cooling mode, the traditional water cooling structure has limited cooling of a winding which generates heat greatly and is separated by an insulating layer, and the winding temperature rise is inevitably caused to be faster under the long-time work of the motor. The advantage of oil cooling is that the cooling medium can directly contact with the winding, and the heat dissipation effect is better, so that the cooling efficiency can be greatly improved.
Oil-cooled motor stator can produce interior alternating stress under high low temperature circulation, and insulating material also can produce ageing under high low temperature circulation for motor stator can take place insulation failure and temperature sensor and become invalid, can lead to the serious damage of motor like this. Therefore, a high-temperature and low-temperature rapid temperature change test for the motor stator becomes a necessary trend, and the test can be used for examining the insulativity of the motor stator and the reliability of the temperature sensor.
However, in the prior art, the system development for performing the high-low temperature rapid temperature change test on the oil-cooled motor stator is not perfect, and the performance of the oil-cooled motor stator cannot be well tested.
Disclosure of Invention
The application provides a test system of oil cooling motor stator to the insulation failure and the temperature sensor inefficacy to oil cooling motor stator carry out the reliability test.
According to an aspect of the present application, there is provided a test system of an oil-cooled motor stator, including:
the testing device comprises a testing container, a stator of the oil-cooled motor to be tested, a control circuit and a control circuit, wherein the testing container is filled with oil, the stator of the oil-cooled motor to be tested is accommodated in the testing container and is immersed in the oil, and the stator of the oil-cooled motor is provided with a stator winding and a temperature sensor;
the oil temperature control equipment is connected with the test container through a pipeline;
a variable alternating current power supply electrically connected to the stator winding;
the signal acquisition module is electrically connected with the temperature sensor;
and the upper computer is in communication connection with the oil temperature control equipment, the variable alternating current power supply and the signal acquisition module respectively.
Preferably, the variable ac power source includes an inverter and a dc power source, the dc power source being electrically connected to the inverter, the inverter being electrically connected to the stator winding.
Preferably, the inverter is integrated with a controller, and the signal acquisition module is implemented by the controller.
Preferably, the pipeline comprises an oil inlet pipeline and an oil outlet pipeline, and the oil temperature control device receives oil from the oil outlet pipeline, converts the oil into another temperature, and inputs the temperature into the test container through the oil inlet pipeline.
Preferably, the upper computer obtains the temperature value of the temperature sensor through the signal acquisition module, and controls the current input to the stator winding by the variable alternating current power supply according to the temperature value.
Preferably, the test system further comprises: and the stirring device is immersed in the oil and is used for driving the oil to flow in the test container.
Preferably, the stirring device comprises:
a rotatable stirring blade at the bottom of the test vessel, the stirring blade facing the inside hollow portion of the stator winding;
a drive motor located outside the test vessel;
and the driving mechanism is driven by the driving motor to drive the stirring blades to rotate.
Preferably, the drive mechanism is a magnetic drive mechanism.
Preferably, a support is arranged in the test container, and the oil-cooled motor stator is fixed on the support.
Preferably, the test system further comprises: and the cooling liquid temperature control equipment is connected with the inverter through a pipeline.
Preferably, the container wall of the test container is a vacuum insulation structure. .
The application has the following beneficial effects: the oil cooling environment of the oil cooling motor stator is simulated by adopting the test container filled with oil and the oil temperature control equipment, so that high and low temperature circulating test can be well performed on the oil cooling motor stator; and still be provided with agitating unit in the test container, can improve the oil temperature distribution homogeneity in the test container for the surface temperature of oil-cooled motor stator is more even, further improves the accuracy of test.
Drawings
Certain specific embodiments of the present application will hereinafter be described in detail by way of example and not limitation with reference to the accompanying drawings, in which like reference numerals identify the same or similar parts or features, and it will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a simplified diagram of a test system in the present application;
FIG. 2 is a schematic structural diagram of a test system according to an embodiment of the present application;
FIG. 3 is a schematic illustration of a rack within a test vessel according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the configuration of the stirring device in the test vessel according to an embodiment of the present application;
FIG. 5 is a schematic view of the structure of the wall of a test vessel according to one embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in many ways different from those described herein, and similar modifications may be made by those skilled in the art without departing from the spirit of the present application, and the present application is therefore not limited to the specific implementations disclosed below.
In the description of the present application, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; the two can be directly connected or connected through other connecting parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present application, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "above," "below," and "above" a second feature includes the first feature being directly below and obliquely below the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
In the description of the present application, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of operation, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of special definition.
Fig. 1 is a schematic diagram of a test system of an oil-cooled motor stator in the present application, the test system including: the oil-cooled motor stator to be tested is accommodated in the testing container and is immersed in the oil, and the oil-cooled motor stator is provided with a stator winding and a temperature sensor; the oil temperature control equipment is connected with the test container through a pipeline; a variable AC power supply electrically connected to the stator winding; the signal acquisition module is electrically connected with the temperature sensor; and the upper computer is in communication connection with the oil temperature control equipment, the variable alternating current power supply and the signal acquisition module respectively.
In the test system, the oil in the test container has electrical insulation, so that a short circuit of a circuit of the oil-cooled motor stator cannot occur, the oil in the test container is preferably the same as or similar to the motor cooling oil adopted by the oil-cooled motor stator when the motor operates, and the height of the oil exceeds that of the oil-cooled motor stator, so that the physical environment of the motor cooling oil-cooled motor stator can be simulated. Compared with air cooling, water cooling and other modes, the embodiment directly adopts oil cooling, and the actual working environment of the motor stator is closer to that of an oil-cooled motor stator, so that the testing accuracy is improved. The oil that can be used in the test container may be motor oil or motor oil containing a small amount of additives such as water, and the components of the motor oil may include base oil (e.g., mineral oil) and oxidizing agent, detergent, and the like, and further, the oil used in the test container may be other types of insulating oil.
The upper computer sends an instruction to the variable alternating current power supply to indicate the variable alternating current power supply to provide or not provide alternating current for the stator winding and provide the frequency and amplitude of the current; the signal acquisition module is used for acquiring a real-time temperature signal of the stator winding and feeding the real-time temperature signal back to the upper computer; the oil temperature control equipment can heat and/or cool oil from the test container according to instructions of an upper computer; by providing alternating current into the stator windings, and combining with oil temperature heating and/or cooling, the high and low temperature circulation process of the oil-cooled motor stator can be realized.
In one embodiment, the variable ac power source may be comprised of an inverter and a dc power source, the dc power source being electrically connected to the inverter, the inverter being electrically connected to the stator windings, and the dc power source preferably being a high voltage dc power source. In addition, a controller can be integrated in the inverter, at the moment, the signal acquisition module can be realized by the controller, and the inverter is electrically connected with the temperature sensor to acquire signals of the temperature sensor.
Fig. 2 is a schematic structural diagram of a test system of a stator of an oil-cooled motor according to an embodiment of the present application, where the test system includes: the testing device comprises a testing container 1, wherein oil is filled in the testing container 1, an oil-cooled motor stator 7 to be tested is accommodated in the testing container 1 and is immersed in the oil, and the oil-cooled motor stator 7 is provided with a stator winding and a temperature sensor; the oil temperature control device 4 is connected with the test container 1 through a pipeline, so that oil circulates between the test container 1 and the oil temperature control device 4, and the temperature of the oil in the test container 1 is changed and controlled; the inverter 2 is electrically connected with a stator winding of the oil-cooled motor stator 7 and the temperature sensor respectively, a controller is integrated in the inverter 2, and a signal acquisition module of the temperature sensor is realized by the controller; the direct current power supply 5 is electrically connected with the inverter 2; and the upper computer 6 is in communication connection with the oil temperature control equipment 4, the inverter 2 and the direct-current power supply 5 respectively.
The oil-cooled motor stator 7 to be tested can be a motor stator of a three-phase alternating current motor, and the inverter 2 and the stator winding can be connected through a UVW three-phase line wire, so that alternating current is introduced into the stator winding. The Temperature sensor of the motor stator 7 may be an NTC (Negative Temperature Coefficient) Temperature sensor, which is a thermistor probe, and the resistance value of the NTC Temperature sensor rapidly decreases with the increase of Temperature, and the corresponding Temperature is determined by measuring the resistance value, so as to achieve the purpose of detecting and controlling the Temperature.
The inverter 2 converts direct current of the direct current power supply 5 into alternating current, the alternating current is input to an oil-cooled motor stator 7 through a UVW three-phase wire, temperature signals of the NTC temperature sensor are collected, and the temperature signals are further fed back to the upper computer 6. The upper computer 6 obtains the temperature value of the temperature sensor through the inverter 2, and controls the current input to the stator winding by the inverter 2 according to the temperature value, namely the upper computer 6 can control the current input to the stator winding by the inverter 6 in a closed loop mode.
The oil temperature control device 4 has a cooling and/or heating function, and when the high-temperature and low-temperature rapid temperature change test is performed on the oil-cooled motor stator 7, the upper computer 6 can control the oil temperature control device 4 to repeatedly heat and/or cool oil in the test container 1, so that the circulation of the high-temperature and low-temperature environment of the oil-cooled motor stator 7 is accelerated.
As shown in fig. 2, an oil inlet pipe 91 and an oil outlet pipe 92 are connected between the oil temperature control device 4 and the test container 1. The oil temperature control device 4 may include a temperature control element and a power pump therein, so as to have both functions of controlling the oil temperature and driving the oil to flow; when the oil temperature control device 4 has only the oil temperature control function, a power pump needs to be additionally provided on the oil inlet pipe 91 or the oil outlet pipe 92. Through the oil outlet pipe 92, the oil flows into the oil temperature control device 4 from the test container 1, and after the oil temperature control device 4 heats or cools the oil to another temperature, the oil is input into the test container 1 through the oil inlet pipe 91. The oil temperature control device 4 can rapidly realize the change of the oil temperature in the test container 1 by continuously temperature-converting the oil from the oil outlet line 92 and inputting it to the test container 1.
Specifically, the upper computer 6 and the oil temperature control device 4 may be connected by a 485 communication line, and the upper computer 6 and the inverter 2 and the dc power supply 5 may be connected by a CAN communication line, but the communication method is not limited thereto.
The inside of the test container 1 is also provided with a bracket, and the oil-cooled motor stator 7 is fixed on the bracket. As shown in fig. 3, the bracket 13 may be fixed to the bottom wall of the test container 1, so that the oil-cooled motor stator 7 may be well fixed to the inner space of the test container 1, facilitating the flow of oil in the inner hollow portion and the outer side of the stator winding of the oil-cooled motor stator 7. Furthermore, the holder 13 can also be fixed to the side wall of the test container 1, which is a possible implementation.
In order to make the oil temperature in the test container 1 more uniform and the temperature of the surface of the oil-cooled motor stator 7 more easily controlled, the test system may further include a stirring device 8, and the stirring device 8 is immersed in the oil in the test container 1 for driving the oil to flow in the test container 1.
The stirring device 8 may be disposed at the bottom or the side of the test container 1, etc., and preferably, the stirring device 8 is disposed at the bottom of the test container 1. As shown in fig. 2, the stirring device 8 includes a rotatable stirring blade 81 at the bottom of the test container 1, the stirring blade 81 facing the inner hollow portion of the stator winding of the oil-cooled motor stator 7; a drive motor 83 located outside the test container 1; and a driving mechanism 82 for rotating the stirring blade 81 by driving of a driving motor 83. When the driving motor 83 is operated, the stirring blade 81 is driven to rotate by the driving mechanism 82, so that the oil in the test container 1 moves upwards along the outer side of the stator winding of the oil-cooled motor stator 7, and the hollow part of the stator winding of the oil-cooled motor stator 7 naturally moves downwards under the action of gravity (as the direction of the circulation of the arrow in the oil in fig. 2), so that the oil in the test container 1 circularly moves at the hollow part and the outer side of the stator winding, the surface temperature of the oil-cooled motor stator 7 is more uniform, and the temperature gradient on the surface of the oil-cooled motor stator 7 is controlled within an acceptable range.
The driving mechanism 82 is used for transmitting the mechanical energy of the driving motor 83 to the stirring blade 81, and the driving mechanism 82 may be a magnetic driving mechanism; the magnetic driving mechanism is a contactless energy transfer technology, that is, the driving motor 83 can drive the stirring blade 81 to rotate through the interaction between magnetic fields. The drive mechanism 82 may be a mechanical drive mechanism, in addition to a magnetic drive.
The stirring device 8, see fig. 4, can also be arranged on the side of the test container 1, in which case the oil-cooled motor stator 7 can be placed in the test container 1 with the stator axis horizontal, so that the stirring device 8 faces the inner hollow part of the oil-cooled motor stator 7.
The lower end of the test container 1 may be further provided with a plurality of legs 11 for supporting the test container 1, and the driving motor 83 may be disposed in the space of the plurality of legs 11 at the bottom of the test container 1.
Further, the test system may further include a coolant temperature control apparatus 3, and the coolant temperature control apparatus 3 is connected to the inverter 2 through a pipe for cooling the inverter 2. The coolant temperature control apparatus 3 can supply the circulating coolant to the inverter 2 to cool down the inverter 2, thereby ensuring that the inverter 2 operates at a proper temperature. In one embodiment, the coolant temperature control device 3 may be in communication with the upper computer 6 to receive control of the upper computer 6, so as to cool the inverter 2.
In order to increase the heat insulation effect of the test container 1, the container wall 12 of the test container 1 may be a vacuum heat insulation structure, and the vacuum heat insulation structure means that the material forming the container wall 12 contains vacuum gaps to increase the heat insulation effect. As shown in fig. 5, the container wall 12 comprises a wall casing 121, and a plurality of vacuum areas 123 located inside the wall casing 121, and since the vacuum degree in the vacuum areas 123 is very high, the thermal conductivity of the vacuum areas 123 is very low, and therefore, the heat conduction effect of the container wall 12 is greatly reduced, so that the oil temperature of the test container 1 is more easily kept stable and controlled. The material constituting the wall case 121 includes, but is not limited to, metal, polymer material, inorganic oxide, etc., and the test container 1 may be an iron tub, for example.
In one embodiment, when an operator performs a high-low temperature rapid temperature change test on the stator 7 of the oil-cooled motor to be tested by using the test system of fig. 2, the following operation stages can be included:
a temperature rising stage: the stirring device 8 in the test container 1 is in a working state, the upper computer 6 sends a current instruction to the inverter 2 through the CAN communication line, and the inverter 2 provides current loading for a stator winding of the oil-cooled motor stator 7 according to a current value specified in the instruction (the specified current value CAN be obtained in a debugging stage, and an appropriate current value is written into the upper computer), so that the stator winding is heated to a target temperature (for example, 180 ℃) at a certain temperature rate.
And (3) high-temperature stabilization stage: the upper computer 6 receives the temperature signal of the NTC temperature sensor through the inverter 2, calculates a target current value in real time according to the temperature signal, for example, by adopting a PID control program, further controls the current of the UVW three-phase wire, and controls the temperature of the stator winding to be stabilized at the target temperature in a closed-loop manner and keep for a period of time at the target temperature.
And (3) cooling: the upper computer 6 controls the loading current of the inverter 2 to be 0, and the oil temperature control device 4 controls the oil temperature in the test container 1 to be reduced to another target temperature (for example, -30 ℃).
The one temperature rising stage, the high temperature stabilizing stage and the temperature reducing stage can complete the one-time high temperature and low temperature circulation process of the oil-cooled motor stator 7, and the high and low temperature rapid temperature change test can be carried out on the oil-cooled motor stator 7 by continuously circulating the process. According to actual test requirements, the high-temperature and low-temperature circulation process of the oil-cooled motor stator 7 can be a circulation mode of a heating stage-a cooling stage, can also be a circulation mode of a heating stage-a high-temperature stable stage-a cooling stage-a low-temperature stable stage, and can be optional.
The low-temperature stabilization phase can be operated according to the following process: the upper computer 6 receives the temperature signal of the NTC temperature sensor through the inverter 2, takes the temperature signal as a feedback signal, and stabilizes the oil temperature at the target temperature through controlling the oil temperature control equipment in real time.
In the above-mentioned high and low temperature rapid temperature change test, the oil temperature control device 4 only functions in the cooling stage and/or the low temperature stabilization stage, i.e., only reduces the temperature; in other embodiments, the oil temperature control device 4 may also achieve the warming effect during the warming phase and/or the high temperature stabilization phase.
In the high-low temperature rapid temperature change test, after one or more cycles are finished, the oil-cooled motor stator 7 can be taken out from the test container 1, and after the surface oil of the oil-cooled motor stator is wiped off, the single performance of the oil-cooled motor stator, such as the insulating performance of an insulating material and the accuracy of a temperature sensor, can be tested.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the present application have been illustrated and described in detail herein, many other variations and modifications consistent with the principles of the application may be ascertained or derived directly from the disclosure herein without departing from the spirit and scope of the application. Accordingly, the scope of the present application should be understood and interpreted to cover all such other variations or modifications.
Claims (11)
1. A test system for a stator of an oil-cooled motor, comprising:
the testing device comprises a testing container, a stator of the oil-cooled motor to be tested, a control circuit and a control circuit, wherein the testing container is filled with oil, the stator of the oil-cooled motor to be tested is accommodated in the testing container and is immersed in the oil, and the stator of the oil-cooled motor is provided with a stator winding and a temperature sensor;
the oil temperature control equipment is connected with the test container through a pipeline;
a variable alternating current power supply electrically connected to the stator winding;
the signal acquisition module is electrically connected with the temperature sensor;
and the upper computer is in communication connection with the oil temperature control equipment, the variable alternating current power supply and the signal acquisition module respectively.
2. The test system of claim 1, wherein the variable ac power source comprises an inverter and a dc power source, the dc power source being electrically connected to the inverter, the inverter being electrically connected to the stator windings.
3. The test system of claim 2, wherein the inverter is integrated with a controller, the signal acquisition module being implemented by the controller.
4. The test system of claim 1, wherein the pipeline comprises an oil inlet pipeline and an oil outlet pipeline, and the oil temperature control device receives oil from the oil outlet pipeline, converts the oil into another temperature, and re-inputs the oil into the test container through the oil inlet pipeline.
5. The test system of claim 1, wherein the upper computer obtains a temperature value of the temperature sensor through the signal acquisition module, and controls the current input from the variable alternating current power supply to the stator winding according to the temperature value.
6. The test system of any one of claims 1-5, further comprising: and the stirring device is immersed in the oil and is used for driving the oil to flow in the test container.
7. The testing system of claim 6, wherein the agitation device comprises:
a rotatable stirring blade at the bottom of the test vessel, the stirring blade facing the inside hollow portion of the stator winding;
a drive motor located outside the test vessel;
and the driving mechanism is driven by the driving motor to drive the stirring blades to rotate.
8. The test system of claim 7, wherein the drive mechanism is a magnetic drive mechanism.
9. The test system according to any one of claims 1 to 5, wherein a support is provided in the test vessel, and the oil-cooled motor stator is fixed to the support.
10. A test system according to claim 2 or 3, characterized in that the test system further comprises: and the cooling liquid temperature control equipment is connected with the inverter through a pipeline.
11. The test system according to any one of claims 1 to 5, wherein the wall of the test vessel is a vacuum insulation structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011366904.8A CN112557900A (en) | 2020-11-27 | 2020-11-27 | Test system of oil-cooled motor stator |
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| CN202011366904.8A CN112557900A (en) | 2020-11-27 | 2020-11-27 | Test system of oil-cooled motor stator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113281646A (en) * | 2021-05-06 | 2021-08-20 | 北京航空航天大学 | Superconducting motor test system |
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