WO2022069215A1 - Connecting device for electric motor testing and electric motor testing device - Google Patents

Connecting device for electric motor testing and electric motor testing device Download PDF

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Publication number
WO2022069215A1
WO2022069215A1 PCT/EP2021/075230 EP2021075230W WO2022069215A1 WO 2022069215 A1 WO2022069215 A1 WO 2022069215A1 EP 2021075230 W EP2021075230 W EP 2021075230W WO 2022069215 A1 WO2022069215 A1 WO 2022069215A1
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WO
WIPO (PCT)
Prior art keywords
electric motor
thermostat
connecting shaft
connecting device
housing
Prior art date
Application number
PCT/EP2021/075230
Other languages
French (fr)
Inventor
Xiang SI
Original Assignee
Zf Friedrichshafen Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zf Friedrichshafen Ag filed Critical Zf Friedrichshafen Ag
Priority to EP21783151.0A priority Critical patent/EP4222464A1/en
Publication of WO2022069215A1 publication Critical patent/WO2022069215A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/002—Thermal testing

Definitions

  • the present invention relates to a connecting device for electric motor testing and an electric motor testing device.
  • an electric motor to be tested is generally placed in a thermostat such that the electric motor is at a set ambient temperature, the electric motor is then taken out for measuring the performance of the electric motor as the performance of the electric motor at the set ambient temperature. Since it is difficult for the electric motor taken out to maintain the ambient temperature set in the thermostat at room temperature, the accuracy of a test result cannot be achieved.
  • the present invention aims to overcome the defect in the prior art that a device for testing an electric motor cannot ensure the accuracy of a test result of electric motor performance at constant ambient temperature, and to provide a novel connecting device for electric motor testing and an electric motor testing device.
  • a connecting device for electric motor testing wherein an electric motor to be tested is placed in a thermostat, and the connecting device penetrates a side wall of the thermostat and comprises a housing, a connecting shaft and at least two bearings.
  • the connecting shaft comprises a first section of the connecting shaft and a second section of the connecting shaft, the first section of the connecting shaft extending beyond the housing to be connected to the electric motor to be tested inside the thermostat, and the second section of the connecting shaft being connected to a piece of electric motor testing equipment outside the thermostat.
  • the at least two bearings are sleeved on the second section of the connecting shaft to support the connecting shaft, an outer ring of each bearing being in tight fit with an inner wall of the housing, an inner ring of each bearing rotating in synchronization with the connecting shaft.
  • the bearing is a ceramic bearing.
  • the connecting shaft is sleeved with a plurality of thrust collars for limiting an axial movement of the inner ring of the ceramic bearing.
  • the bearing is a gas bearing.
  • the housing comprises a first end cap and a housing body fixedly connected to the first end cap, the first end cap being located inside the thermostat, and the first section of the connecting shaft extending beyond the first end cap.
  • lubricating grease is provided in a hole of the first end cap for the first section of the connecting shaft to extend therefrom.
  • the connecting device further comprises a thermostatic structure, the thermostatic structure comprising a fluid inflow passage and a fluid outflow passage provided in a housing body, as well as a bushing disposed outside the outer ring of the bearing, the bearing being in a space extent covered by the thickness of the side wall of the thermostat, the fluid inflow passage being in communication with one end of the bushing, and the other end of the bushing being in communication with the fluid outflow passage.
  • a thermostatic structure comprising a fluid inflow passage and a fluid outflow passage provided in a housing body, as well as a bushing disposed outside the outer ring of the bearing, the bearing being in a space extent covered by the thickness of the side wall of the thermostat, the fluid inflow passage being in communication with one end of the bushing, and the other end of the bushing being in communication with the fluid outflow passage.
  • the bushing is in tight fit with the housing, and an outer surface of the bushing is provided with a channel for a fluid to flow therethrough.
  • the channel is spiral.
  • An electric motor testing device comprises a thermostat, a torque sensor, a servo electric motor, and the connecting device as mentioned above.
  • An electric motor to be tested is placed in the thermostat, and an output shaft of the electric motor is connected to the first section of the connecting shaft of the connecting device.
  • a side wall of the thermostat is provided with a through hole, the housing of the connecting device passing through the through hole and being sealed against an inner wall of the through hole.
  • the second section of the connecting shaft is connected to the torque sensor, and the torque sensor is connected to the servo electric motor.
  • a rubber sleeve is arranged on the inner wall of the through hole, and the housing is sealed against the inner wall of the through hole by means of the rubber sleeve.
  • the electric motor to be tested in the thermostat is connected to the external electric motor testing equipment by means of the connecting device, such that it can be ensured in real time that the electric motor to be tested has multiple constant ambient temperature values, and the performance of the electric motor at different ambient temperatures can be measured in real time; sealing between the housing of the connecting device and the wall of the thermostat is beneficial for keeping the temperature in the thermostat at a constant value; and by virtue of the housing, direct contact between the connecting shaft and the wall of the thermostat can be avoided, such that the frictional loss caused when power from the output shaft of the electric motor is transferred to the connecting shaft is reduced, which improves the accuracy of a test result.
  • Fig. 1 is a simplified structural schematic diagram of an electric motor testing device of embodiment 1 of the present invention.
  • Fig. 2 is a structural schematic diagram of a connecting device of embodiment
  • Fig. 3 is a structural schematic diagram of a connecting device of embodiment
  • thermostat 1 thermostat 1, connecting device 2, torque sensor 3, servo electric motor 4, electric motor to be tested 5, coupling 6, side wall 11, through hole 12, rubber sleeve 13, housing 21, connecting shaft 22, bearing 23, outer ring 231, inner ring 232, rolling body 233, thrust collar 224, bushing 25, first end cap 21a, main body of housing 21b, fluid inflow passage 213, fluid outflow passage 214, first section 221, second section 222, gas bearing 24, inner ring 241, outer ring 242, seal 243, channel 251.
  • This embodiment provides an electric motor testing device which is suitable for testing various types of electric motors, including a large electric motor and a small electric motor, and is particularly suitable for testing the performance of an electric motor where its torque is less than 0.1 Nm.
  • the testing device can test parameters of the electric motor, such as torque, rotational speed, current and internal resistance.
  • the testing device comprises a thermostat 1, a connecting device 2, a torque sensor 3 and a servo electric motor 4.
  • An electric motor to be tested 5 is placed in the thermostat 1, and the thermostat is capable of providing a wide range of adjustable ambient temperatures, such as from -40 degrees to 150 degrees, for the electric motor to be tested.
  • a side wall 11 of the thermostat 1 is provided with a through hole 12, the electric motor to be tested 5 passes through the through hole 12 by virtue of the connecting device 2 and is connected to the torque sensor 3 outside the thermostat 1, and the torque sensor 3 is connected to the servo electric motor 4.
  • the testing device further comprises one or more couplings 6, respective connection between the electric motor to be tested 5, the connecting device 2, the torque sensor 3 and the servo electric motor 4 are enabled by the couplings 6.
  • Fig. 2 specifically shows the connecting device 2 comprising a housing 21, a connecting shaft 22 and at least two bearings 23.
  • a seal is formed between the housing 21 and the side wall 11 of the thermostat when the connecting device 2 penetrates the side wall 11.
  • a rubber sleeve 13 is arranged on the inner wall of the through hole 12, and the housing 21 is sealed against the inner wall of the through hole by means of the rubber sleeve 13.
  • the arrangement of the rubber sleeve 13 can adaptively match a connection gap between the housing 21 and the through hole 12. By merely adjusting the size of the rubber sleeve 13, each of housings of different sizes can pass through the through hole 12 to create a good seal without changing the size of the housing 21, making testing more convenient.
  • the housings 21 is of a two-section structure to facilitate mounting. Specifically, the housing 21 comprises a first end cap 21a and main body 21b of housing fixedly connected to the first end cap, the first end cap 21a being disposed inside the thermostat 1.
  • the connecting shaft 22 comprises a first section 221 and a second section 222, the first section 221 extending beyond the first end cap 21a and being connected to the electric motor 5 to be tested inside the thermostat 1, and the second section 222 being connected to a piece of electric motor testing equipment outside the thermostat 1.
  • the electric motor testing equipment may comprise the torque sensor 3 and the servo electric motor 4.
  • Lubricating grease may also be provided in a hole of the first end cap 21a for the first section 221 to extend therefrom, in order to prevent circulation of air without a pressure difference between the inside of the housing 21 and the outside of the housing 21.
  • the output shaft of the electric motor to be tested 5 may be connected to the first section 221 of the connecting shaft 22 by means of the coupling 6.
  • the second section 222 of the connecting shaft 22 may be connected to the torque sensor 3 by means of the coupling 6.
  • At least two bearings 23 are sleeved on the second section 222 to support the connecting shaft 22.
  • the number of the bearings in this embodiment is 2, and each bearing is a ceramic bearing.
  • the ceramic bearing has an outer ring 231, an inner ring 232 and a rolling body 233 made of a ceramic material sandwiched between the outer ring and the inner ring.
  • the outer ring 231 of each bearing is in tight fit with the inner wall of the housing 21, and the inner ring 232 of each bearing rotates in synchronization with the connecting shaft 22. Due to the good heat resistance of the ceramic bearing, the support effect of the ceramic bearing on the connecting shaft may not be influenced by the temperature in the thermostat, and the stability of support for the connecting shaft can be improved.
  • the connecting shaft 22 is sleeved with a plurality of thrust collars 224, the thrust collars 224 being used for limiting an axial movement of the inner ring 232 of the ceramic bearing, and the thrust collars 224 rotating in synchronization with the connecting shaft.
  • a recess or boss may also be provided on the inner wall of the housing 21 such that the outer ring of the ceramic bearing is mounted within the recess or abuts against the boss to prevent the axial movement of the outer ring of the ceramic bearing.
  • the connecting structure formed by the housing 21, the connecting shaft 22 and the ceramic bearing 23 the power from the output shaft of the electric motor to be tested can be transferred to the external testing equipment. Therefore, the tip shaking caused by overlong design of the output shaft of the motor is prevented while it is ensured that the electric motor is located inside the thermostat for a long time. Also, the frictional loss caused by the direct contact between the connecting shaft and the wall of the thermostat is avoided by means of the housing, and the accuracy of a test result can be ensured.
  • the thermostatic structure in the connecting device such that the ceramic bearing located in the space extent covered by the thickness of the side wall of the thermostat is kept at constant temperature, that is, the thermostatic structure is suitable for the ceramic bearing in the through hole extent for the wall of the thermostat, while the ceramic bearing outside the through hole extent for the wall of the thermostat cannot use the thermostatic structure because the ceramic bearing is in room-temperature environment.
  • the implementation of the thermostatic structure may be as follows: the thermostatic structure comprises a fluid inflow passage 213 and a fluid outflow passage 214 provided in the main body 21b of the housing 21, and a bushing 25 outside the outer ring 231 of the ceramic bearing 23.
  • the fluid inflow passage 213 is in communication with one end of the bushing 25, and the other end of the bushing 25 is in communication with the fluid outflow passage 214.
  • the bushing 25 is in tight fit with the housing 21, an outer surface of the bushing 25 is provided with a channel 251 for a fluid to flow therethrough, and the channel 251 is spiral.
  • a fluid is injected into the fluid inflow passage 213 and may be liquid or gas, and the gas may be compressed gas.
  • the fluid flows into the bushing 25, through the spiral channel 251 in the bushing and then flows out of the fluid outflow passage 214, such that the ceramic bearing 23 can be kept at constant temperature without being influenced by the temperature in the thermostat, and thus the support for the connecting shaft is not influenced.
  • This embodiment provides an electric motor testing device, as shown in Fig. 3, which differs from embodiment 1 in that the at least two bearings each are gas bearings 24.
  • Each of the gas bearing 24 comprises an inner ring 241, an outer ring 242 and a seal 243, the inner ring 241, the outer ring 22 and the seal 243 of the gas bearing 24 forming a closed space which being filled with compressed gas to support the connecting shaft 22.
  • the gas bearing 24 is sleeved on the second section 222 of the connecting shaft 22, the outer ring 242 of the gas bearing 24 is in tight fit with the inner wall of the housing 21, and the inner ring 241 of the gas bearing 24 rotates in synchronization with the connecting shaft 22.
  • the gas bearing 24 supports the connecting shaft 22 by means of the compressed gas, and large-area contact between the bearing 24 and the connecting shaft 22 would not be created, and contact friction between the connecting shaft 22 and the housing 21 can be avoided, thereby reducing energy loss caused when the power from the output shaft of the electric motor to be tested is transferred to the connecting shaft, and further improving the accuracy of the test result.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The present invention provides a connecting device for electric motor testing. An electric motor to be tested is placed in a thermostat. The connecting device penetrates a side wall of the thermostat and comprises a housing, a connecting shaft and at least two bearings. The connecting shaft comprises a first section and a second section, the first section extending beyond the housing to be connected to the electric motor to be tested inside the thermostat, and the second section being connected to a piece of electric motor testing equipment outside the thermostat. The at least two bearings are sleeved on the second section to support the connecting shaft, an outer ring of each bearing being in tight fit with an inner wall of the housing, the inner ring of each bearing rotating in synchronization with the connecting shaft, and when the connecting device penetrates the side wall of the thermostat, a seal being created between the housing and the side wall. The connecting device for electric motor testing can ensure the accuracy of a test result of the electric motor to be tested at constant ambient temperature.

Description

Description
Connecting Device for Electric Motor Testing And Electric Motor Testing Device
Technical Field
The present invention relates to a connecting device for electric motor testing and an electric motor testing device.
Background Art
In the field of electric motor testing, the performance of electric motors in different temperature ranges needs to be tested. For small electric motors, it is particularly difficult to test their performance in different temperature ranges in which their torque output is small.
In the prior art, an electric motor to be tested is generally placed in a thermostat such that the electric motor is at a set ambient temperature, the electric motor is then taken out for measuring the performance of the electric motor as the performance of the electric motor at the set ambient temperature. Since it is difficult for the electric motor taken out to maintain the ambient temperature set in the thermostat at room temperature, the accuracy of a test result cannot be achieved.
If the electric motor is not taken out from the thermostat in order to simulate the ambient temperature of the electric motor in real time, an output shaft of the electric motor cannot be directly connected to electric motor testing equipment outside the thermostat due to the length limitation of the output shaft of the electric motor. If the output shaft is designed to be very long, the output shaft of the electric motor may be susceptible to tip shaking, which will influence the accuracy of the test result. In addition, if the output shaft directly penetrates the side wall of the thermostat, contact will be produced between the output shaft and the side wall of the thermostat, causing frictional loss, which also influences the accuracy of the test result. It is apparent that the structure for testing the electric motor in the prior art may not obtain an accurate test result of the electric motor performance at a certain constant ambient temperature.
Summary of the Invention
For solving the technical problem, the present invention aims to overcome the defect in the prior art that a device for testing an electric motor cannot ensure the accuracy of a test result of electric motor performance at constant ambient temperature, and to provide a novel connecting device for electric motor testing and an electric motor testing device.
The present invention solves the technical problem by the following technical solution: a connecting device for electric motor testing, wherein an electric motor to be tested is placed in a thermostat, and the connecting device penetrates a side wall of the thermostat and comprises a housing, a connecting shaft and at least two bearings.
The connecting shaft comprises a first section of the connecting shaft and a second section of the connecting shaft, the first section of the connecting shaft extending beyond the housing to be connected to the electric motor to be tested inside the thermostat, and the second section of the connecting shaft being connected to a piece of electric motor testing equipment outside the thermostat.
The at least two bearings are sleeved on the second section of the connecting shaft to support the connecting shaft, an outer ring of each bearing being in tight fit with an inner wall of the housing, an inner ring of each bearing rotating in synchronization with the connecting shaft.
When the connecting device penetrates the side wall of the thermostat, a seal is created between the housing and the side wall.
Preferably, the bearing is a ceramic bearing.
Preferably, the connecting shaft is sleeved with a plurality of thrust collars for limiting an axial movement of the inner ring of the ceramic bearing.
Preferably, the bearing is a gas bearing. Preferably, the housing comprises a first end cap and a housing body fixedly connected to the first end cap, the first end cap being located inside the thermostat, and the first section of the connecting shaft extending beyond the first end cap.
Preferably, lubricating grease is provided in a hole of the first end cap for the first section of the connecting shaft to extend therefrom.
Preferably, the connecting device further comprises a thermostatic structure, the thermostatic structure comprising a fluid inflow passage and a fluid outflow passage provided in a housing body, as well as a bushing disposed outside the outer ring of the bearing, the bearing being in a space extent covered by the thickness of the side wall of the thermostat, the fluid inflow passage being in communication with one end of the bushing, and the other end of the bushing being in communication with the fluid outflow passage.
Preferably, the bushing is in tight fit with the housing, and an outer surface of the bushing is provided with a channel for a fluid to flow therethrough.
Preferably, the channel is spiral.
An electric motor testing device comprises a thermostat, a torque sensor, a servo electric motor, and the connecting device as mentioned above.
An electric motor to be tested is placed in the thermostat, and an output shaft of the electric motor is connected to the first section of the connecting shaft of the connecting device.
A side wall of the thermostat is provided with a through hole, the housing of the connecting device passing through the through hole and being sealed against an inner wall of the through hole.
The second section of the connecting shaft is connected to the torque sensor, and the torque sensor is connected to the servo electric motor.
Preferably, a rubber sleeve is arranged on the inner wall of the through hole, and the housing is sealed against the inner wall of the through hole by means of the rubber sleeve.
The technical effects obtained by the present invention are as follows: the electric motor to be tested in the thermostat is connected to the external electric motor testing equipment by means of the connecting device, such that it can be ensured in real time that the electric motor to be tested has multiple constant ambient temperature values, and the performance of the electric motor at different ambient temperatures can be measured in real time; sealing between the housing of the connecting device and the wall of the thermostat is beneficial for keeping the temperature in the thermostat at a constant value; and by virtue of the housing, direct contact between the connecting shaft and the wall of the thermostat can be avoided, such that the frictional loss caused when power from the output shaft of the electric motor is transferred to the connecting shaft is reduced, which improves the accuracy of a test result.
Brief Description of the Drawings
Fig. 1 is a simplified structural schematic diagram of an electric motor testing device of embodiment 1 of the present invention.
Fig. 2 is a structural schematic diagram of a connecting device of embodiment
1 of the present invention.
Fig. 3 is a structural schematic diagram of a connecting device of embodiment
2 of the present invention.
List of reference numerals: thermostat 1, connecting device 2, torque sensor 3, servo electric motor 4, electric motor to be tested 5, coupling 6, side wall 11, through hole 12, rubber sleeve 13, housing 21, connecting shaft 22, bearing 23, outer ring 231, inner ring 232, rolling body 233, thrust collar 224, bushing 25, first end cap 21a, main body of housing 21b, fluid inflow passage 213, fluid outflow passage 214, first section 221, second section 222, gas bearing 24, inner ring 241, outer ring 242, seal 243, channel 251.
Detailed Description of Embodiments The present invention will be described more clearly and completely hereinafter according to a preferred embodiment of the present invention and with reference to the accompanying drawings.
Embodiment 1
This embodiment provides an electric motor testing device which is suitable for testing various types of electric motors, including a large electric motor and a small electric motor, and is particularly suitable for testing the performance of an electric motor where its torque is less than 0.1 Nm. The testing device can test parameters of the electric motor, such as torque, rotational speed, current and internal resistance.
As shown in Fig. 1, the testing device comprises a thermostat 1, a connecting device 2, a torque sensor 3 and a servo electric motor 4.
An electric motor to be tested 5 is placed in the thermostat 1, and the thermostat is capable of providing a wide range of adjustable ambient temperatures, such as from -40 degrees to 150 degrees, for the electric motor to be tested. A side wall 11 of the thermostat 1 is provided with a through hole 12, the electric motor to be tested 5 passes through the through hole 12 by virtue of the connecting device 2 and is connected to the torque sensor 3 outside the thermostat 1, and the torque sensor 3 is connected to the servo electric motor 4. Optionally, the testing device further comprises one or more couplings 6, respective connection between the electric motor to be tested 5, the connecting device 2, the torque sensor 3 and the servo electric motor 4 are enabled by the couplings 6.
Fig. 2 specifically shows the connecting device 2 comprising a housing 21, a connecting shaft 22 and at least two bearings 23.
A seal is formed between the housing 21 and the side wall 11 of the thermostat when the connecting device 2 penetrates the side wall 11. Specifically, a rubber sleeve 13 is arranged on the inner wall of the through hole 12, and the housing 21 is sealed against the inner wall of the through hole by means of the rubber sleeve 13.
The arrangement of the rubber sleeve 13 can adaptively match a connection gap between the housing 21 and the through hole 12. By merely adjusting the size of the rubber sleeve 13, each of housings of different sizes can pass through the through hole 12 to create a good seal without changing the size of the housing 21, making testing more convenient.
The housings 21 is of a two-section structure to facilitate mounting. Specifically, the housing 21 comprises a first end cap 21a and main body 21b of housing fixedly connected to the first end cap, the first end cap 21a being disposed inside the thermostat 1.
The connecting shaft 22 comprises a first section 221 and a second section 222, the first section 221 extending beyond the first end cap 21a and being connected to the electric motor 5 to be tested inside the thermostat 1, and the second section 222 being connected to a piece of electric motor testing equipment outside the thermostat 1. In an embodiment, the electric motor testing equipment may comprise the torque sensor 3 and the servo electric motor 4. Lubricating grease may also be provided in a hole of the first end cap 21a for the first section 221 to extend therefrom, in order to prevent circulation of air without a pressure difference between the inside of the housing 21 and the outside of the housing 21.
In a particular embodiment, the output shaft of the electric motor to be tested 5 may be connected to the first section 221 of the connecting shaft 22 by means of the coupling 6. The second section 222 of the connecting shaft 22 may be connected to the torque sensor 3 by means of the coupling 6.
At least two bearings 23 are sleeved on the second section 222 to support the connecting shaft 22. The number of the bearings in this embodiment is 2, and each bearing is a ceramic bearing. The ceramic bearing has an outer ring 231, an inner ring 232 and a rolling body 233 made of a ceramic material sandwiched between the outer ring and the inner ring. The outer ring 231 of each bearing is in tight fit with the inner wall of the housing 21, and the inner ring 232 of each bearing rotates in synchronization with the connecting shaft 22. Due to the good heat resistance of the ceramic bearing, the support effect of the ceramic bearing on the connecting shaft may not be influenced by the temperature in the thermostat, and the stability of support for the connecting shaft can be improved.
Furthermore, optionally, the connecting shaft 22 is sleeved with a plurality of thrust collars 224, the thrust collars 224 being used for limiting an axial movement of the inner ring 232 of the ceramic bearing, and the thrust collars 224 rotating in synchronization with the connecting shaft.
In some embodiments, a recess or boss (not shown) may also be provided on the inner wall of the housing 21 such that the outer ring of the ceramic bearing is mounted within the recess or abuts against the boss to prevent the axial movement of the outer ring of the ceramic bearing.
By means of the connecting structure formed by the housing 21, the connecting shaft 22 and the ceramic bearing 23, the power from the output shaft of the electric motor to be tested can be transferred to the external testing equipment. Therefore, the tip shaking caused by overlong design of the output shaft of the motor is prevented while it is ensured that the electric motor is located inside the thermostat for a long time. Also, the frictional loss caused by the direct contact between the connecting shaft and the wall of the thermostat is avoided by means of the housing, and the accuracy of a test result can be ensured.
Optionally, in order to further avoid the possible influence of the temperature in the thermostat on the ceramic bearing 23, it is also possible to provide a thermostatic structure in the connecting device such that the ceramic bearing located in the space extent covered by the thickness of the side wall of the thermostat is kept at constant temperature, that is, the thermostatic structure is suitable for the ceramic bearing in the through hole extent for the wall of the thermostat, while the ceramic bearing outside the through hole extent for the wall of the thermostat cannot use the thermostatic structure because the ceramic bearing is in room-temperature environment. The implementation of the thermostatic structure may be as follows: the thermostatic structure comprises a fluid inflow passage 213 and a fluid outflow passage 214 provided in the main body 21b of the housing 21, and a bushing 25 outside the outer ring 231 of the ceramic bearing 23. The fluid inflow passage 213 is in communication with one end of the bushing 25, and the other end of the bushing 25 is in communication with the fluid outflow passage 214.
The bushing 25 is in tight fit with the housing 21, an outer surface of the bushing 25 is provided with a channel 251 for a fluid to flow therethrough, and the channel 251 is spiral. A fluid is injected into the fluid inflow passage 213 and may be liquid or gas, and the gas may be compressed gas. The fluid flows into the bushing 25, through the spiral channel 251 in the bushing and then flows out of the fluid outflow passage 214, such that the ceramic bearing 23 can be kept at constant temperature without being influenced by the temperature in the thermostat, and thus the support for the connecting shaft is not influenced.
Embodiment 2
This embodiment provides an electric motor testing device, as shown in Fig. 3, which differs from embodiment 1 in that the at least two bearings each are gas bearings 24. Each of the gas bearing 24 comprises an inner ring 241, an outer ring 242 and a seal 243, the inner ring 241, the outer ring 22 and the seal 243 of the gas bearing 24 forming a closed space which being filled with compressed gas to support the connecting shaft 22. The gas bearing 24 is sleeved on the second section 222 of the connecting shaft 22, the outer ring 242 of the gas bearing 24 is in tight fit with the inner wall of the housing 21, and the inner ring 241 of the gas bearing 24 rotates in synchronization with the connecting shaft 22.
Since the gas bearing 24 supports the connecting shaft 22 by means of the compressed gas, and large-area contact between the bearing 24 and the connecting shaft 22 would not be created, and contact friction between the connecting shaft 22 and the housing 21 can be avoided, thereby reducing energy loss caused when the power from the output shaft of the electric motor to be tested is transferred to the connecting shaft, and further improving the accuracy of the test result.
Although the specific embodiments of the present invention are described above, it should be appreciated by those skilled in the art that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of the present invention, and these changes or modifications fall within the scope of the present invention.

Claims

Claims
1. A connecting device for electric motor testing, characterized in that an electric motor to be tested is placed in a thermostat, the connecting device penetrates a side wall of the thermostat and comprises a housing, a connecting shaft and at least two bearings, the connecting shaft comprises a first section of the connecting shaft and a second section of the connecting shaft, the first section of the connecting shaft extending beyond the housing to be connected to the electric motor to be tested inside the thermostat, and the second section of the connecting shaft being connected to a piece of electric motor testing equipment outside the thermostat, the at least two bearings are sleeved on the second section of the connecting shaft to support the connecting shaft, an outer ring of each bearing being in tight fit with an inner wall of the housing, an inner ring of each bearing rotating in synchronization with the connecting shaft, and when the connecting device penetrates the side wall of the thermostat, a seal being created between the housing and the side wall.
2. The connecting device of claim 1, characterized in that the bearing is a ceramic bearing.
3. The connecting device of claim 2, characterized in that the connecting shaft is sleeved with a plurality of thrust collars for limiting an axial movement of the inner ring of the ceramic bearing.
4. The connecting device of claim 1, characterized in that the bearing is a gas bearing.
5. The connecting device of any one of claims 1-4, characterized in that the housing comprises a first end cap and a housing body fixedly connected to the first
9 end cap, the first end cap being located inside the thermostat, and the first section of the connecting shaft extending beyond the first end cap.
6. The connecting device of claim 5, characterized in that lubricating grease is provided in a hole of the first end cap for the first section of the connecting shaft to extend therefrom.
7. The connecting device of claim 5, characterized in that the connecting device further comprises a thermostatic structure, the thermostatic structure comprising a fluid inflow passage and a fluid outflow passage provided in a housing body, as well as a bushing disposed outside the outer ring of the bearing, the bearing being in a space extent covered by the thickness of the side wall of the thermostat, the fluid inflow passage being in communication with one end of the bushing, and the other end of the bushing being in communication with the fluid outflow passage.
8. The connecting device of claim 7, characterized in that the bushing is in tight fit with the housing, and an outer surface of the bushing is provided with a channel for a fluid to flow therethrough.
9. The connecting device of claim 8, characterized in that the channel is spiral.
10. An electric motor testing device, characterized by comprising a thermostat, a torque sensor, a servo electric motor, and a connecting device of any one of claims 1-9, wherein an electric motor to be tested is placed in the thermostat, and an output shaft of the electric motor is connected to the first section of the connecting shaft of the connecting device, a side wall of the thermostat is provided with a through hole, the housing of the connecting device passing through the through hole and being sealed against an inner wall of the through hole, and the second section of the connecting shaft is connected to the torque sensor, and the torque sensor is connected to the servo electric motor.
11. The electric motor testing device of claim 10, characterized in that a rubber sleeve is arranged on the inner wall of the through hole, and the housing is sealed against the inner wall of the through hole by means of the rubber sleeve.
11
PCT/EP2021/075230 2020-09-29 2021-09-14 Connecting device for electric motor testing and electric motor testing device WO2022069215A1 (en)

Priority Applications (1)

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EP21783151.0A EP4222464A1 (en) 2020-09-29 2021-09-14 Connecting device for electric motor testing and electric motor testing device

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857959A1 (en) * 1997-02-10 1998-08-12 Angelantoni Industrie SpA Test chamber for motor vehicle engines
EP3206005A1 (en) * 2016-02-10 2017-08-16 Linchpin Plant Limited Transmission device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857959A1 (en) * 1997-02-10 1998-08-12 Angelantoni Industrie SpA Test chamber for motor vehicle engines
EP3206005A1 (en) * 2016-02-10 2017-08-16 Linchpin Plant Limited Transmission device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STAUBER R ET AL: "NEUE BMW-MOTORPRUFSTANDE ZUR SIMULATION VON HOHE UND KLIMA", MTZ - MOTORTECHNISCHE ZEITSCHRIFT, SPRINGER, vol. 50, no. 11, 1 November 1989 (1989-11-01), pages 540 - 547, XP000095272, ISSN: 0024-8525 *

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