CN115932576A - Multifunctional test system for magnetic suspension motor - Google Patents
Multifunctional test system for magnetic suspension motor Download PDFInfo
- Publication number
- CN115932576A CN115932576A CN202211545733.4A CN202211545733A CN115932576A CN 115932576 A CN115932576 A CN 115932576A CN 202211545733 A CN202211545733 A CN 202211545733A CN 115932576 A CN115932576 A CN 115932576A
- Authority
- CN
- China
- Prior art keywords
- motor
- bearing
- test system
- multifunctional
- magnetic suspension
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Landscapes
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
A magnetic suspension motor multifunctional test system and a method. The multifunctional testing system for the magnetic suspension motor comprises a clamp for clamping a stator of the motor to be tested, a dynamometer for testing the power of the motor to be tested and a connecting shaft connected with an extending shaft of the dynamometer; the multifunctional magnetic suspension motor testing system also comprises a bearing, wherein the bearing comprises a main shaft connected with the connecting shaft and a shaft sleeve sleeved outside the main shaft; the shaft sleeve and the clamp are fixedly arranged, and the main shaft is suspended in the shaft sleeve. According to the invention, the main shaft connected with the rotor of the motor to be tested is suspended in the shaft sleeve, so that the main shaft is prevented from directly contacting the inner wall of the shaft sleeve when rotating, the mechanical friction loss of a motor test system is reduced, and the stability and the consistency of the motor during testing are improved.
Description
Technical Field
The invention belongs to the technical field of magnetic suspension motor multifunctional test, and particularly relates to a magnetic suspension motor multifunctional test system and a magnetic suspension motor multifunctional test method.
Background
In the process of developing the magnetic suspension motor, the energy-saving effect of the compressor is determined by a large part of the motor efficiency; in addition, the product pursuits high performance-price ratio, needs the motor to accomplish the power demand that rationally satisfies compressor pump body load. In both cases, technicians need to perform output power, rotational speed, current and efficiency evaluation through the motor performance test bench to determine the quality of the design scheme.
However, the use of the above-mentioned apparatus for a magnetic levitation motor faces problems of the mounting and testing accuracy of the motor under test. Patent ZL200520064759.2 discloses a multi-functional test clip of compressor magnetic suspension motor, can solve like air conditioner and refrigerator compressor motor, because of there is not shell and end cover and have the problem of testing the difficulty, and the biggest characteristic of this clip is adaptable compressor motor overall dimension in certain extent, and the universalization is better. However, in the structure, a bearing seat mechanism is arranged between the support sleeve and the main shaft, the ball bearings at two ends have rolling friction loss, although the absolute value of the mechanical friction loss is smaller, the loss of the micro-special motor such as a refrigerator compressor motor accounts for a large amount, the testing precision is influenced, and the visual representation is that the efficiency of the same motor is tested twice and fluctuates by more than 3 points. Patent ZL200920311716.8 discloses a multi-functional testing arrangement of no shell magnetic suspension motor, installs dynamometer and bearing frame on its test platform, and general motor spindle installs in the bearing frame, and main shaft one end is connected with the test shaft of dynamometer, and the other end has the special clip of installation rotor to the rotor overcoat has a stator that can move away. The device is simple to operate when testing the motor, and the multifunctional testing accuracy of the shell-less magnetic suspension motor is greatly improved. However, due to the existence of the bearing seat and the bearing, mechanical friction loss still exists, and the stability and consistency of the multifunctional test data of the magnetic suspension motor are influenced.
Disclosure of Invention
The invention aims to provide a magnetic suspension motor multifunctional test system and a magnetic suspension motor multifunctional test method, and solves the technical problem that a shell-less motor is not high in stability and consistency when being tested on the magnetic suspension motor multifunctional test system.
In order to solve the problems, the invention provides a magnetic suspension motor multifunctional test system which comprises a clamp, a dynamometer and a connecting shaft, wherein the clamp is used for clamping a stator of a motor to be tested; the magnetic suspension motor multifunctional test system also comprises a bearing, wherein the bearing comprises a main shaft connected with the connecting shaft and a shaft sleeve sleeved outside the main shaft; the shaft sleeve and the clamp are fixedly arranged, and the main shaft is suspended in the shaft sleeve.
Preferably, the bearing is an air bearing.
Preferably, the magnetic suspension motor multifunctional test system further comprises a gas source for providing gas for the bearing, and the gas source is communicated with the bearing.
Preferably, the multifunctional magnetic suspension motor testing system further comprises a pressure regulator, wherein the pressure regulator is arranged on an air passage between the air source and the bearing.
Preferably, the multifunctional magnetic suspension motor testing system further comprises a control switch, and the control switch is arranged on an air channel between the air source and the bearing.
Preferably, the multifunctional magnetic suspension motor testing system further comprises a drying filter for drying the air source, and the drying filter is arranged on an air channel between the air source and the bearing.
Preferably, the magnetic suspension motor multifunctional test system further comprises a power analyzer connected with the dynamometer.
Preferably, the dynamometer includes a dynamometer host and a dynamometer controller for controlling the dynamometer host.
Preferably, the dynamometer further includes a dynamometer cooling device for cooling the dynamometer host, the dynamometer cooling device being disposed on the dynamometer host.
Preferably, the bearing is a magnetic bearing.
Preferably, the magnetic suspension motor multifunctional test system comprises a magnetic suspension bearing controller for controlling the magnetic suspension bearing and a position sensor for monitoring the magnetic suspension bearing.
The invention also provides a magnetic suspension motor multifunctional test method, which is applied to the magnetic suspension motor multifunctional test system and comprises the following steps: testing whether a main shaft of a bearing of the multifunctional testing system of the magnetic suspension motor is in contact with a shaft sleeve; connecting a rotor of a motor to be tested to the spindle, and fixing a stator of the motor to be tested on a clamp of the multifunctional testing system of the magnetic suspension motor; opening a dynamometer; setting test parameters; and starting the motor to be tested.
Preferably, the step of setting the test parameters includes: setting p Ω =0, wherein p Ω Is a mechanical friction loss.
According to the multifunctional testing system and the method for the magnetic suspension motor, the spindle connected with the rotor of the motor to be tested is suspended in the shaft sleeve, so that the spindle is prevented from being in direct contact with the inner wall of the shaft sleeve when rotating, the mechanical friction loss of the multifunctional testing system for the magnetic suspension motor is reduced, and the stability and the consistency of the multifunctional testing system for the magnetic suspension motor are improved.
Drawings
FIG. 1 is a schematic structural diagram of a multifunctional testing system of a magnetic levitation motor in the prior art;
FIG. 2 is a motor power flow diagram of the magnetic levitation motor multifunctional test system shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a multifunctional testing system of a magnetic levitation motor according to an embodiment of the invention;
FIG. 4 is a schematic view of a clip and bearing engagement configuration according to an embodiment of the present invention;
fig. 5 is a left side view of fig. 4.
The reference numerals are represented as: 1', a voltage-stabilizing variable frequency power supply; 2', a test bench; 3', a dynamometer; 4', a tested motor clamp; 5', a dynamometer controller; 6', a power analyzer; 7', a computer;
1. a clip; 21. a dynamometer host; 22. a dynamometer controller; 23. a dynamometer cooling device; 3. a connecting shaft; 4. a bearing; 41. a main shaft; 42. a shaft sleeve; 5. a power source; 6. a test bench; 7. a power analyzer; 8. a data acquisition and processor; 9. a gas source; 10. a voltage regulator; 11. a control switch; 12. and drying the filter.
Detailed Description
In the following embodiments of the present invention, the description is made only for convenience of description of the structure, and the structure to be protected by the present invention is not limited.
At present, a lot of motor performance test devices are provided, as shown in fig. 1, the motor performance test devices include a voltage-stabilizing variable-frequency power supply 1', a test bench 2', a dynamometer 3', a tested motor clamp 4', a dynamometer controller 5', a power analyzer 6' and a computer 7' provided with data acquisition and processing software. The apparatus shown in fig. 1 is suitable for testing an industry standard motor with a housing end cap, and fig. 2 is a diagram of a motor function whose testing principle follows, in which fig. 2 shows: p 1 Input power of motor, p Cu1 Stator copper loss p Fe Stator core loss, P M Electromagnetic power, p Cu2 Rotor copper loss, P Ω Total mechanical power, p Ω Mechanical loss, p h Additional loss, P 2 -motor output power.
The motor performance testing apparatus shown in fig. 1 simulates a mechanical load by controlling the magnitude of torque output from the dynamometer 3 'by the dynamometer controller 5'. Constantly collecting instantaneous speed n and input power P of a tested motor 1 And calculating the efficiency value eta of the tested motor under the load torque through the following formula in a background manner:
P 2 ＝T·n/60*2π
η＝P 2 /P 1
referring to fig. 3 to 5 in combination, according to an embodiment of the present invention, the present invention provides a motor testing system, including a clamp 1 for clamping a stator of a motor to be tested, a dynamometer for testing power of the motor to be tested, a connecting shaft 3 connected to an extending shaft of the dynamometer, and a bearing 4, where the bearing 4 includes a main shaft 41 connected to the connecting shaft 3 and a shaft sleeve 42 sleeved outside the main shaft 41; the sleeve 42 is fixed to the clip 1, and the spindle 41 is suspended in the sleeve 42. The main shaft 41 connected with the rotor of the motor to be tested is suspended in the shaft sleeve 42, so that the main shaft 41 is prevented from being in direct contact with the inner wall of the shaft sleeve 42 when rotating, the mechanical friction loss of a multifunctional testing system of the magnetic suspension motor is reduced, and the stability and consistency of the multifunctional testing of the magnetic suspension motor are improved.
Specifically, as shown in fig. 3, the multifunctional testing system for the magnetic levitation motor of the present invention includes a power supply 5, and the power supply 5 supplies power to the whole multifunctional testing system for the magnetic levitation motor. In a preferred embodiment, the power supply 5 of the present invention is a variable frequency stabilized power supply to meet the requirements of a multifunctional testing system of a magnetic levitation motor.
Referring to fig. 4 and 5 in combination, the clamp 1 of the multifunctional testing system of the magnetic suspension motor of the invention is fixedly arranged with the shaft sleeve 42 of the bearing 4, the connecting shaft 3 passes through the clamp 1 and is connected with the extending shaft of the dynamometer, and the connecting shaft 3 is suspended in the center of the clamp 1. The main shaft 41 is externally connected to the connecting shaft 3, and the main shaft 41 is suspended in the sleeve 42, and the manufacturing accuracy of the main shaft 41 can be higher than that of the connecting shaft 3, so that the friction between the main shaft 41 and the sleeve 42 can be reduced even if the main shaft 41 contacts the inner wall of the sleeve 42 during rotation. In another embodiment, the magnetic suspension motor multifunctional test system further comprises a test bench 6, and the bearing 4, the clamp 1 and the dynamometer can be placed on the test bench 6.
The dynamometer of the present invention includes a dynamometer host 21 and a dynamometer controller 22 for controlling the operation of the dynamometer host 21. The dynamometer controller 22 may be provided within the dynamometer host 21, or may be independent of the dynamometer host 21. In a preferred embodiment, the dynamometer further comprises a dynamometer cooling device 23 for cooling the dynamometer main machine 21, and the dynamometer cooling device 23 may be directly arranged on the dynamometer main machine 21 to prevent the dynamometer main machine 21 from working too hot and affecting the test result of the magnetic levitation motor multifunctional test system.
The multifunctional test system for the magnetic suspension motor further comprises a power analyzer 7 connected with the dynamometer and used for measuring the power or other parameters of the dynamometer.
The multifunctional magnetic suspension motor test system also comprises a data acquisition and processor 8, and in a specific embodiment of the invention, the data acquisition and processor 8 can be a computer, and data acquisition and processing software is loaded on the computer; in other embodiments, the data acquisition and processor 8 of the present invention may also be other electronic devices, such as a cell phone loaded with data acquisition and processing software. The data acquisition and processor 8 is connected with the dynamometer controller 22 and the power analyzer 7, and acquires relevant data of the dynamometer controller 22 and the power analyzer 7 so as to analyze the motor to be measured.
In the above general description of the multifunctional testing system for magnetic levitation motor of the present invention, in a specific embodiment, the bearing 4 of the present invention can be an air bearing, i.e. air under a certain pressure is introduced into the cavity of the shaft sleeve 42 so that the spindle 41 is suspended in the cavity of the shaft sleeve 42. Because the main shaft 41 of the air bearing is suspended in the cavity of the shaft sleeve 42 to rotate, the main shaft 41 can be ensured not to generate mechanical friction with the inner wall of the shaft sleeve 42 when rotating.
As shown in FIG. 3, in order to provide air into the cavity of the shaft sleeve 42 of the air bearing, so that the main shaft 41 of the air bearing does not contact with the inner wall of the shaft sleeve 42 in the whole motor test system, the invention also provides an air source 9, and the air source 9 is communicated with the bearing 4 through an air channel. In a preferred embodiment, the air source 9 of the present invention is a regulated air source 9, so as to provide the regulated air source 9 in the cavity of the shaft sleeve 42, and the air pressure is stable, so that the contact between the main shaft 41 and the inner wall of the shaft sleeve 42 can be effectively avoided.
In order to realize pressure regulation, a pressure regulator 10 can be arranged on an air passage between the air source 9 and the air bearing.
In order to better control the air source 9, a control switch 11 can be arranged on an air passage between the air source 9 and the air bearing; in a particular embodiment, the control switch 11 may be a pressure relay.
Generally, the bearing 4 belongs to a precision device, and it is necessary to ensure the drying of the bearing 4 and reduce the corrosion of the bearing 4, so the multifunctional testing system for the magnetic suspension motor further includes a dry filter 12 for drying the air source 9, and the dry filter 12 is disposed on the air passage between the air source 9 and the air bearing, so that the air conveyed into the shaft sleeve 42 of the air bearing is dry.
In another embodiment, the bearing 4 of the present invention is a magnetic suspension bearing, and the spindle 41 is suspended in the sleeve 42 by magnetic force, so that there is no mechanical contact between the spindle 41 and the sleeve 42. Preferably, the multifunctional testing system for the magnetic suspension motor further comprises a magnetic suspension bearing controller for controlling the magnetic suspension bearing and a position sensor for monitoring the magnetic suspension bearing, so that the position between the spindle 41 and the shaft sleeve 42 of the magnetic suspension bearing can be monitored and controlled in real time, the contact between the inner wall of the spindle 41 and the inner wall of the shaft sleeve 42 is prevented, the mechanical friction loss of the multifunctional testing system for the magnetic suspension motor is reduced, and the stability and the consistency of the multifunctional testing system for the magnetic suspension motor are improved.
The invention also provides a magnetic suspension motor multifunctional test method applied to the magnetic suspension motor multifunctional test system, which comprises the following steps: testing whether a main shaft 41 of a bearing 4 of the multifunctional testing system of the magnetic suspension motor is in contact with a shaft sleeve 42; connecting a rotor of a motor to be tested to the main shaft 41, and fixing a stator of the motor to be tested on a clamp 1 of the multifunctional testing system of the magnetic suspension motor; opening a dynamometer; setting test parameters; the motor is turned on.
Specifically, step S1: the main shaft 41 of the bearing 4 is tested for contact with the sleeve 42.
Taking the air bearing as an example, before the motor to be tested is in the multifunctional magnetic suspension motor testing system, the air bearing is debugged statically, a universal meter can be used for testing the steady-state resistance value between the spindle 41 and the shaft sleeve 42, and the air floating effect and the gap between the spindle 41 and the shaft sleeve 42 can be simply and conveniently judged. If the resistance value of the multimeter test is infinity, the air film is good, and the air bearing can work. If the resistance change is erratic or zero, it indicates that the spindle 41 is in contact with the sleeve 42, and the spindle 41 needs to be removed for cleaning or repair.
Step S2: the rotor of the motor to be tested is connected to the main shaft 41 and the stator of the motor to be tested is fixed to the clamp 1 of the motor test system.
After the main shaft 41 of the test bearing 4 is not contacted with the shaft sleeve 42, the rotor of the motor to be tested is connected to the main shaft 41, and the stator of the motor to be tested is fixed on the clamp 1 of the multifunctional test system of the magnetic suspension motor.
After the motor to be tested is assembled, whether the main shaft 41 of the test bearing 4 is in contact with the shaft sleeve 42 can be further confirmed through the method, and the test result can be debugged.
And step S3: and opening the dynamometer.
And step S4: and setting test parameters.
Wherein p is Ω =0, wherein p Ω The mechanical friction loss is caused, when the multifunctional testing system of the magnetic suspension motor works, the multifunctional testing system is influenced by the abrasion and the assembly of the bearing 4, and p is measured every time Ω The change in value of (c) is unusual. P can be seen from prior art FIG. 2 Ω Value pair P of 1 The value of (A) has a relatively large influence, P 1 Is the input power of the motor. p is a radical of formula Ω Is large in value of P 1 The value of (a) is large, and the motor efficiency is low; p is a radical of formula Ω Is small in value of P 1 The value of (2) is small, and the motor efficiency is high. In the embodiment, the main shaft 41 of the bearing 4 is suspended in the shaft sleeve 42, so that the influence of the friction and the assembly of the bearing 4 on the multifunctional test result of the magnetic suspension motor can be basically ignored, and therefore, p is set Ω And the mechanical friction interference can be eliminated, and the stability and the consistency of the multifunctional testing system of the magnetic suspension motor are improved.
And S5, starting the motor to be tested.
According to the magnetic suspension motor multifunctional test method, the spindle of the applied magnetic suspension motor multifunctional test system is suspended in the shaft sleeve, so that the spindle can be prevented from being in direct contact with the inner wall of the shaft sleeve when rotating, and the influence of the friction of a bearing and the assembly on a motor test result is eliminated; and in the test process, p is set Ω And the mechanical friction interference can be eliminated, and the stability and consistency of the motor test system are improved.
The following description will be given by taking an air bearing as an example to describe a testing method of a magnetic suspension motor multifunctional testing system with an air bearing:
step S10: the air source 9 is connected to make the air pressure of the air source 9 reach 4 multiplied by 10 5 Pa；
For better operation of the air bearing, it is necessary to ensure that the air pressure supplied by the air source 9 reaches 4X 10 5 Pa, if the air pressure does not reach 4X 10 5 Pa, the pressure can be increased by the pressure regulator 10 or the air supply source 9 can be switched.
Step S20: testing whether the main shaft 41 of the air bearing is in contact with the shaft sleeve 42;
the air bearing is statically debugged, a universal meter is used for testing the steady-state resistance value between the main shaft 41 and the shaft sleeve 42, and the air floatation effect and the size of the gap between the main shaft 41 and the shaft sleeve 42 can be judged. If the resistance value of the multimeter test is infinity, the air film is good, and the air bearing can work. If the resistance change is not constant or zero, it indicates that the spindle 41 is in contact with the sleeve 42, and the spindle 41 needs to be removed for cleaning or repair.
And S30, connecting the rotor of the motor to be tested to the main shaft 41, and fixing the stator of the motor to be tested on the clamp 1 of the motor testing system.
After the main shaft 41 of the test bearing 4 is not contacted with the shaft sleeve 42, the rotor of the motor to be tested is connected to the main shaft 41, and the stator of the motor to be tested is fixed on the clamp 1 of the multifunctional test system of the magnetic suspension motor.
After the motor to be tested is assembled, if necessary, whether the main shaft 41 of the test bearing 4 is in contact with the shaft sleeve 42 can be further confirmed, and the test result can be debugged.
Step S40, starting the variable-frequency stabilized voltage power supply 5, and selecting the power supply voltage and frequency required by regulation;
step S50, turning on a dynamometer and a power analyzer 7;
step S60, opening a data acquisition and processor, setting configuration parameters and selecting a proper range;
wherein p in the configuration parameter is Ω ＝0，p Ω For the mechanical friction losses, other parameter settings are referred to the prior art.
Step S70, starting the motor to be tested to run, and adjusting the running frequency of a driving controller of the motor to be tested;
s80, adjusting and setting the loading torque of the dynamometer host;
and S90, after the operation is stably carried out for a certain time, storing and post-processing the data.
In conclusion, the spindle connected with the rotor of the motor to be tested is suspended in the spindle sleeve, so that the spindle is prevented from being directly contacted with the inner wall of the spindle sleeve when rotating, the mechanical friction loss of the multifunctional testing system of the magnetic suspension motor is reduced, and the stability and the consistency of the motor during testing are improved.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A magnetic suspension motor multifunctional test system comprises a clamp (1) for clamping a stator of a motor to be tested, a dynamometer for testing the power of the motor to be tested and a connecting shaft (3) connected with an extending shaft of the dynamometer; it is characterized in that the preparation method is characterized in that,
the multifunctional test system for the magnetic suspension motor further comprises a bearing (4), wherein the bearing (4) comprises a main shaft (41) connected with the connecting shaft (3) and a shaft sleeve (42) sleeved outside the main shaft (41);
the shaft sleeve (42) and the clamp (1) are fixedly arranged, and the spindle (41) is suspended in the shaft sleeve (42).
2. The maglev motor multifunctional test system according to claim 1, characterized in that the bearing (4) is an air bearing.
3. The magnetic levitation motor multifunction test system according to claim 2, further comprising a gas source (9) for providing gas to the bearing (4), the gas source (9) being in communication with the bearing (4).
4. The magnetic levitation motor multifunctional test system as claimed in claim 3, further comprising a pressure regulator (10), wherein the pressure regulator (10) is arranged on the air channel between the air source (9) and the bearing (4).
5. Multifunctional magnetic levitation motor test system according to claim 3, further comprising a control switch (11), wherein the control switch (11) is arranged on the air channel between the air source (9) and the bearing (4).
6. The magnetic levitation motor multifunctional test system as claimed in claim 3, further comprising a dry filter (12) for drying the gas source (9), the dry filter (12) being arranged on the gas path between the gas source (9) and the bearing (4).
7. Multifunctional test system for magnetic levitation motors as claimed in claim 3, characterised in that it further comprises a power analyzer (7) connected to the dynamometer.
8. Multifunctional test system for magnetic levitation motors as claimed in claim 1, characterised in that the bearing (4) is a magnetic levitation bearing.
9. A magnetic levitation motor multifunctional test method applied to the magnetic levitation motor multifunctional test system of any one of the claims 1 to 8, characterized by comprising the following steps:
testing whether a main shaft (41) of a bearing (4) of the magnetic suspension motor multifunctional test system is in contact with a shaft sleeve (42);
connecting a rotor of a motor to be tested to the spindle (41), and fixing a stator of the motor to be tested to a clamp (1) of the magnetic suspension motor multifunctional test system;
opening a dynamometer;
setting test parameters;
and starting the motor to be tested.
10. The magnetic levitation motor multifunctional testing method as recited in claim 9, wherein the step of setting test parameters comprises: setting p Ω =0, wherein p Ω Is a mechanical friction loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211545733.4A CN115932576A (en) | 2022-12-01 | 2022-12-01 | Multifunctional test system for magnetic suspension motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211545733.4A CN115932576A (en) | 2022-12-01 | 2022-12-01 | Multifunctional test system for magnetic suspension motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115932576A true CN115932576A (en) | 2023-04-07 |
Family
ID=86655517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211545733.4A Pending CN115932576A (en) | 2022-12-01 | 2022-12-01 | Multifunctional test system for magnetic suspension motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115932576A (en) |
-
2022
- 2022-12-01 CN CN202211545733.4A patent/CN115932576A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8497607B2 (en) | Electric machine with integrated coolant temperature sensor | |
| CN203203812U (en) | Test device for providing AC permanent magnet synchronous gearless elevator traction machine | |
| Ferreira et al. | Method for in-field evaluation of the stator winding connection of three-phase induction motors to maximize efficiency and power factor | |
| JP2003525002A (en) | Shaft voltage and current monitoring system | |
| US8653706B2 (en) | Method of operating an electric machine having an integrated coolant level sensor | |
| JP3671367B2 (en) | Abnormality diagnosis method for electrical equipment | |
| US8613600B2 (en) | Vacuum pump system | |
| CN111684710A (en) | Motor control system, motor control device, and bearing life diagnosis method | |
| CN115932576A (en) | Multifunctional test system for magnetic suspension motor | |
| CN110337548A (en) | Temperature prediction device, compressor, temperature predicting method and the program for carrying magnetic bearing | |
| US20080050058A1 (en) | Method and Device for Monitoring a Temperature of a Bearing of a Rotating Shaft | |
| KR100954063B1 (en) | Dynamic Characteristic Analysis Device Of Superspeed Air Bearing Spindle | |
| CN114443430A (en) | Server fan fault prediction system and method | |
| CN106787999A (en) | The startup localization method and its circuit of a kind of direct-current brushless no-hall motor | |
| CN2852527Y (en) | Wide band speed-regulating constant power high-speed electric main shaft | |
| CN107907829B (en) | Motor testing system and method | |
| CN116325483A (en) | Method for static eccentric fault detection of induction motor | |
| JP2019163752A (en) | Inspection device and inspection method of fuel pump | |
| JP2022521045A (en) | How to control the start of the oil pump | |
| CN207571274U (en) | Motor Measuring System | |
| CN106602797B (en) | The detection device and its detection method of Noninvasive testing induction conductivity bias | |
| CN210180536U (en) | Double-motor coaxial coupling cross-reference steady-state noise detection device | |
| JP2009287414A (en) | Cooling fan device and zirconia oxygen analyzer provided with the cooling fan device | |
| KR20130107862A (en) | Method of controlling compressor system and compressor system for protecting surge | |
| CN204758296U (en) | High -speed deep groove ball bearing fatigue testing machine of microminiature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |