CN206226220U - Motor gas-gap early warning system - Google Patents
Motor gas-gap early warning system Download PDFInfo
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- CN206226220U CN206226220U CN201621355570.3U CN201621355570U CN206226220U CN 206226220 U CN206226220 U CN 206226220U CN 201621355570 U CN201621355570 U CN 201621355570U CN 206226220 U CN206226220 U CN 206226220U
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- 238000001514 detection method Methods 0.000 claims description 58
- 238000007689 inspection Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 7
- 210000000038 chest Anatomy 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Abstract
Embodiment of the present utility model provides a kind of motor gas-gap early warning system.Motor gas-gap early warning system includes：Wire and control device, wherein, wire is arranged on the surface of the stator relative with rotor, and the diameter of wire is less than the minimal air gap value between stator and rotor；Control device is connected with wire, and control device is used to detect whether wire disconnects and correspondingly controlled motor.Using the technical solution of the utility model; can judge whether motor gas-gap diminishes by detecting whether wire disconnects; so as to controlled motor is shut down before motor breaks down; avoid causing the structural member in motor the damage of unrepairable, efficiently solve the problem that air gap change causes motor easily to break down.
Description
Technical field
The utility model is related to technical field of motors, more particularly to a kind of motor gas-gap early warning system.
Background technology
Air gap is the air gap between motor stator and rotor, is an important electromagnetic parameter of generator, to motor
Mechanical performance and electric property suffer from directly influence.In the running of motor, temperature overheating expands stator, fixed
Sub- surfacing is because quality problems are protruded or are peeled off, and the bias that causes of the uneven load that is subject to of stator and rotor etc. is asked
Topic, can all cause air gap to diminish, and rotor occur and adhesive occurs, and cause stator to be rubbed with rotor occurrence of large-area so that unshakable in one's determination,
The damage of the structural member exposed to damaging such as winding and magnetic pole.For example, because the amount of deflection of bearing wear, rotor sinking or arbor is excessive
Make rotor eccentricity, cause electric machine rotor to sweep thorax phenomenon, the heat for causing motor to be easily generated burns out.
Motor is caused to break down, it is necessary to be monitored to air gap in motor operation course in order to prevent air gap from changing.
At present, current vortex sensor generally is installed in the end of stator coil in the prior art, is popped one's head in by measurement sensor and rotor
The distance on surface, and draw air gap by correlation computations.This method is measurement indirectly, and current vortex sensor is in motor fortune
Can be vibrated during row so that measurement result is not accurate enough, the air gap value according to electric vortex sensor measuring cannot be to electricity
Machine carries out precise control.Therefore, the method that air gap is monitored using current vortex sensor, it is impossible to efficiently solve air gap change and lead
Send a telegraph the problem that machine easily breaks down.
Utility model content
Embodiment of the present utility model provides a kind of motor gas-gap early warning system, is led with solving air gap change in the prior art
Send a telegraph the problem that machine easily breaks down.
To reach above-mentioned purpose, embodiment of the present utility model provides a kind of motor gas-gap early warning system, including：Wire and
Control device, wherein, wire is arranged on the surface of the stator relative with rotor, and the diameter of wire is less than between stator and rotor
Minimal air gap value；Control device is connected with wire, and control device is used to detect whether wire disconnects and correspondingly controlled motor.
Further, control device include detection circuit and controller, detection circuit be connected with wire, controller and detect
Circuit is connected；Electric signal in detection electric circuit inspection wire, controller judges whether wire disconnects and correspondingly according to electric signal
Controlled motor；Or, whether detection electric circuit inspection wire disconnects and generates detection signal, and controller controls electricity according to detection signal
Machine.
Further, wire be one, or, wire be more than one, detection circuit be used for detect one or one with
Electric signal in upper wire, controller determines whether wire disconnection and correspondingly controlled motor according to electric signal.
Further, setting multiple of the diameter of wire less than minimal air gap value.
Further, wire is along the axially extending of stator.
Further, wire is arranged on the surface of the slot wedge on stator.
Further, wiring groove is provided with the surface at slot wedge two ends, the two ends of wire are separately positioned on two wirings
In groove；Or, slot wedge two ends are provided with wiring channel, and wiring channel forms routing hole, the two ends of wire on the surface of slot wedge
It is located in two wiring channels by routing hole respectively.
Further, detection circuit include voltage/current detection device, voltage/current detection device be connected to wire with
Between controller.
Further, detection circuit also includes analogue collection module, and analogue collection module is connected to voltage/current inspection
Survey between device and controller.
Further, motor gas-gap early warning system also includes alarm module, and alarm module is connected with controller.
The motor gas-gap early warning system of the utility model embodiment, diameter is set less than motor minimum by stator surface
The wire of air gap value, and by detecting whether the air gap whether wire is disconnected to judge motor diminishes, so as to event occur in motor
Controlled motor is shut down before barrier, it is to avoid the damage of unrepairable is caused to the structural member in motor, efficiently solves air gap change
Change causes the problem that motor easily breaks down.
Brief description of the drawings
Fig. 1 is the part-structure schematic diagram of the motor gas-gap early warning system of the utility model embodiment；
The structural representation that Fig. 2 is set for the wire of the motor gas-gap early warning system of the utility model embodiment.
Description of reference numerals：
10th, rotor；11st, rotor magnetic pole；20th, stator；21st, slot wedge；22nd, wiring groove；30th, wire；D, air gap.
Specific embodiment
The motor gas-gap early warning system to the utility model embodiment is described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the part-structure schematic diagram of the motor gas-gap early warning system of the utility model embodiment, and the motor gas-gap is pre-
Alert system is suitably mounted in various types of motors (for example, wind-driven generator), in motor operation course to stator and
Air gap between rotor is monitored, and is shut down come controlled motor by the signal for becoming hour detection wire disconnection in air gap, so that
Prevent motor from rotor friction occur, sweeping the failures such as thorax.
In the present embodiment, with motor gas-gap early warning system application to the wind power generating set in, to the gas of wind-driven generator
Gap is illustrated as a example by being monitored.In other embodiments, may be referred to the present embodiment should by the motor gas-gap early warning system
With in extremely other kinds of motor.
As shown in figure 1, according to embodiment of the present utility model, the motor gas-gap early warning system includes that wire 30 and control are filled
Put (not shown).Wire 30 is arranged on the surface of the stator 20 relative with rotor 10, and the diameter of wire 30 is less than stator
Minimal air gap value between 20 and rotor 10；Control device is connected with wire 30, for detecting whether wire 30 disconnects and corresponding
Ground controlled motor.
Wherein, the surface of stator 20 relative with rotor 10 can be the surface of stator core, can also be such as institute in Fig. 1
Show, be the surface of slot wedge 21.
Minimal air gap value be on the circumferencial direction of motor minimal air gap occur position between stator 20 and rotor 10
The distance between the surface of rotor magnetic pole 11 shown in distance, such as Fig. 1 and the surface of stator 20 (surface unshakable in one's determination) are air gap D,
Can be as minimal air gap value.In actual application scenarios, the occurrence of minimal air gap value can use current vortex sensor
Or other method is measured, can also be determined by combining the empirical value of the similar motor in similar application scenarios.
In the motor gas-gap early warning system, wire 30 is arranged on the surface of stator 20 (for example, the slot wedge 21 on stator 20
Surface) on, because the diameter of wire 30 is less than minimal air gap value, wire 30 can not influence fixed in motor normal course of operation
Relative rotation between son 20 and rotor 10.In motor operation course, if the air gap of motor diminishes, stator 20 and rotor 10 it
Between distance can be less than minimal air gap value.When the distance is decreased to the diameter of wire 30, wire 30 occurs with the surface of rotor 10
Rub and disconnect.Now, control device detects wire 30 and disconnects, it may be determined that rotor friction or fixed turn occur in motor
The problems such as thering is foreign matter to enter between son, and then correspondingly controlled motor is shut down, controlled motor is out of service before failure, from
And be effectively prevented from motor and rotor friction occur or sweep the failures such as thorax.If control device is not detected by wire 30 disconnecting, can
With the diameter of the unchanged as low as wire 30 of the air gap for determining motor, motor is in normal operating condition, and now, control device is correspondingly
Controlled motor continues normal operation.
In a kind of feasible implementation method, control device includes the detection circuit and controller that are connected with each other, using wire
30 induced field currents that relative motion is produced in the magnetic field that rotor magnetic pole 11 is formed, by detecting voltage, electricity in wire 30
The mode of stream or the electric signal such as resistance value detects whether wire 30 disconnects, and correspondingly whether controlled motor shuts down.
Specifically, detection circuit is connected with wire 30 and controller respectively, for detecting the electric signal in wire 30, and
The electric signal that will be detected is sent to controller, make controller according to detection electric circuit inspection to electric signal whether normally judge
Whether wire 30 disconnects, and then correspondingly controlled motor.For example, the curtage that controller can be arrived in detection electric circuit inspection
Signal shows that current value or magnitude of voltage are zero, or resistance signal display resistance value it is very big when, it is determined that detection electric circuit inspection is to different
Normal electric signal, and judge that wire 30 has disconnected, and then controlled motor is shut down；In the curtage letter that detection electric circuit inspection is arrived
Number display current value or magnitude of voltage be not zero, or resistance signal display resistance value it is smaller when, it is determined that detection electric circuit inspection to just
Normal electric signal, and judge that wire 30 does not disconnect, and then controlled motor continues normal operation.
Certainly, in actual application scenarios, it is also possible to the integrated above-mentioned arbitration functions in circuit is detected, with by detection
Whether electric signal in wire 30 normally judges whether wire 30 disconnects, and generates and corresponding characterize what whether wire 30 disconnected
Detection signal, detection signal is sent to controller.The information whether controller disconnects according to the wire 30 that detection signal is indicated,
Carry out controlled motor and continue normal operation or controlled motor shutdown.
In the present embodiment, the wire that wire 30 is preferably wire or enamel-covered wire equal diameter is smaller and electric conductivity is good,
Electric signal in convenient detection wire 30, and easily disconnected when wire 30 is rubbed with the surface of rotor 10, it is ensured that detection
Electric circuit inspection to abnormal signal sensitivity, so as to improve the reliability of the motor gas-gap early warning system.
Preferably, the motor gas-gap early warning system includes one or more (at least two) wire 30, detects circuit
For detecting the electric signal in wire 30, controller judges whether wire 30 disconnects and correspondingly controlled motor according to electric signal.
The position of wire 30 is set and set-up mode can easily occur air gap change according to the application scenarios of motor, and motor
Small abort situation is determined.Specifically, when wire 30 is one, motor can be arranged on and stator 20 is most easily occurred and turned
The abort situation of adhesive in son 10, it would however also be possible to employ the mode of bending or bending wire 30 there is, for example with similar square wave
Mode makes wire 30 along the circumferentially extending of stator 20, so as to realize an air gap pretension prison for the whole circumference of stator 20 of 30 pairs, wire
Survey.When wire 30 is more than one, multiple abort situation that easily generation air gap diminishes in motor can be arranged on.For example,
During by motor gas-gap early warning system application to the wind power generating set, at least three can be set on the surface of generator unit stator 20
Root wire 30, and three wires 30 therein are arranged on three abort situation easily broken down in generator.By each wire
After 30 are connected with detection circuit respectively by lead-out wire extraction generator, you can the air gap change to generator is monitored,
And shutdown control was carried out before alternator failure, prevent stator core, winding and rotor magnetic pole 11 of generator etc. from tying
There is the damage of unrepairable in component.Wherein, controller can be arranged in the master control system of wind power generating set, and by inspection
Slowdown monitoring circuit is connected with multiple conducting wires 30, and when any in multiple conducting wires 30 disconnects, controller can be according to detection circuit inspection
The abnormal signal control generator outage for measuring.
Wherein, setting multiple of the diameter of wire 30 less than the minimal air gap value between stator 20 and rotor 10.
Because in motor actual moving process, each structural member can produce deformation quantity under stress so that the air gap of motor
Change a lot.Air gap change does not interfere with the normal operation of motor, by setting the diameter of wire 30 less than most stingy
The setting multiple of gap value, equivalent to certain air gap excursion is set, allows motor normal in the range of the air gap of safety
Operation.
The setting multiple is less than 1, for example, setting multiple can be 0.5.Motor air gap reduce when, stator 20 and turn
During spacing between son 10 is decreased to the diameter (0.5 times of minimal air gap value) of wire 30 from minimal air gap value, wire
30 will not rub with the surface of rotor 10, and detection circuit can detect the normal signal in wire 30.Reduce in the spacing
To wire 30 diameter when, friction and disconnect in wire 30 and the surface of rotor 10, detection electric circuit inspection to abnormal signal there is, control
Device is then out of service according to the timely controlled motor of abnormal signal, prevents motor from occurring damaging.Additionally, the setting multiple should not mistake
It is small, to prevent the intensity of the too small influence wire 30 of the diameter of wire 30, cause wire 30 setting to during the surface of stator 20
There is fracture.
In the present embodiment, wire 30 is arranged on the surface of stator 20, and along the axially extending of stator 20 so that wire 30
Larger induced field current, convenient detection electric circuit inspection can be produced in the magnetic field that rotor magnetic pole 11 is formed in motor operation
Electric signal in wire 30, and facilitate controller to judge whether wire 30 disconnects and phase according to the electric signal of detection electric circuit inspection
Ground controlled motor is answered, to improve the sensitivity of the motor gas-gap early warning system.
As depicted in figs. 1 and 2, wire 30 can be arranged on the surface of the slot wedge 21 on stator 20, so as to by wire 30
It is fixed on the surface of stator 20.
Specifically, wire 30 is pasted onto the surface of slot wedge 21 and length direction (the width edge on the surface along slot wedge 21
The circumference of stator 20；Length direction along stator 20 axial direction, perpendicular to width) center line on, so as to effectively realize
Fixation to wire 30.And, the surface at the two ends of slot wedge 21 is provided with wiring groove 22, and the two ends of wire 30 are separately positioned on
In two wiring grooves 22, and extend wiring groove 22.The two ends of wire 30 slot wedge 21 and lead-out wire are extended by wiring groove 22
Connection, is connected by lead-out wire with detection circuit.Become hour in the air gap of motor, the part being pasted onto on the surface of slot wedge 21 is led
Line 30 rubs with the surface of rotor 10, and disconnects rapidly.
Certainly, in other embodiments, the fixed form of wire 30 is not limited to above-mentioned bonding method, and wire 30 extends
The mode of slot wedge 21 is also not necessarily limited to above by the mode for setting wiring groove 22.For example, ensureing the structural strength of slot wedge 21
In the case of, wiring channel can be set at the two ends of slot wedge 21, and wiring channel is formed routing hole on the surface of slot wedge 21, conveniently lead
The two ends of line 30 are located in two wiring channels by routing hole respectively.
In the present embodiment, detection circuit includes being connected to voltage/current detection device between wire 30 and controller, is used for
The voltage/current signals in wire 30 are detected, and the voltage/current signals that will be detected are sent to controller, lead to controller
Cross and judge whether the voltage/current signals for detecting are abnormal, carry out the running status of controlled motor.If for example, the voltage for detecting/
Current signal is zero, it can be determined that to detect abnormal signal, and mutually should determine that wire 30 has disconnected, so that controlled motor is stopped
Machine.
Additionally, detection circuit can also include other electrical signal detection devices, for example, resistor detecting device.If resistance is examined
When survey device detects small resistor signal, it can be determined that to detect normal signal；If resistor detecting device is detected greatly
During resistance signal, it can be determined that to detect abnormal signal, so that it is determined that wire 30 is already off.
Preferably, detection circuit also includes analogue collection module.Analogue collection module is connected to voltage/current detection
Between device and controller, for the voltage/current signals that voltage/current detection device is detected to be converted into analog quantity letter
Number, and voltage/current signals are sent to controller in the form of analog signalses, facilitate controller to process signal.
And, detection circuit can also include modular converter.Modular converter is connected to voltage/current detection device with simulation
Between amount acquisition module, for the AC signal that voltage/current detection device is detected to be converted into direct current signal, and by direct current
Signal is sent to analogue collection module, facilitates analogue collection module to process signal.
Preferably, the motor gas-gap early warning system of the present embodiment also includes alarm module.Alarm module is connected with controller,
Alarmed for receiving alarm control signal from controller.Received from detection circuit in controller and determine the different of the disconnection of wire 30
Regular signal, and during controlled motor shutdown, controller sends alarm control signal to alarm module, control alarm module is reported
It is alert, to notify that motor of the staff to having shut down takes corresponding measure.
The utility model embodiment motor gas-gap early warning system has the effect that：
Wire of the diameter less than motor minimal air gap value is set by stator surface, whether detection wire disconnects determining
Whether the air gap of motor diminishes, so that controlled motor is shut down, prevents motor from rotor friction occur or sweeps the failures such as thorax, it is to avoid
The damage of unrepairable is caused to the structural member in motor, efficiently solving air gap change causes asking for motor easily failure
Topic.
On this basis, judge whether wire occurs with rotor surface by fixing wire on the slot wedge surface of stator
Friction, and judge whether wire disconnects by the electric signal in voltage or current sensing means detection wire, to ensure the electricity
The sensitivity and reliability of machine air gap early warning system.
And, the motor gas-gap early warning system has the advantages that simple structure, can also use common wire, voltage
Or the relatively low part of price such as current sensor, cost is relatively low.
It may be noted that the need for according to implementation, all parts described in this application can be split as into more multi-part, also may be used
The part operation of two or more parts or part is combined into new part, to realize the purpose of this utility model.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art in the technical scope that the utility model is disclosed, the change that can be readily occurred in
Change or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with described
Scope of the claims is defined.
Claims (10)
1. a kind of motor gas-gap early warning system, it is characterised in that including：Wire (30) and control device, wherein,
The wire (30) is arranged on the surface of the stator (20) relative with rotor (10), and the diameter of the wire (30) is less than
Minimal air gap value between the stator (20) and rotor (10)；
The control device is connected with the wire (30), and the control device is used to detect whether the wire (30) disconnects simultaneously
Correspondingly control the motor.
2. motor gas-gap early warning system according to claim 1, it is characterised in that the control device includes detection circuit
And controller, the detection circuit is connected with the wire (30), and the controller is connected with the detection circuit；
Electric signal in wire (30) described in the detection electric circuit inspection, the controller is led according to the electric signal judges
Whether line (30) disconnects and correspondingly controls the motor；Or,
Whether wire (30) disconnects and generates detection signal described in the detection electric circuit inspection, and the controller is according to the detection
Signal controls the motor.
3. motor gas-gap early warning system according to claim 2, it is characterised in that the wire (30) is, or,
The wire (30) is more than one, during the detection circuit is used to detect the one or more wire (30)
Electric signal, the controller determines whether that the wire (30) disconnects and correspondingly controls the electricity according to the electric signal
Machine.
4. motor gas-gap early warning system according to claim 1, it is characterised in that the diameter of the wire (30) is less than institute
State the setting multiple of minimal air gap value.
5. motor gas-gap early warning system according to claim 1, it is characterised in that the wire (30) is along the stator
(20) axially extending.
6. motor gas-gap early warning system according to claim 1, it is characterised in that it is described fixed that the wire (30) is arranged on
On the surface of the slot wedge (21) on sub (20).
7. motor gas-gap early warning system according to claim 6, it is characterised in that on the surface at slot wedge (21) two ends
Wiring groove (22) is provided with, the two ends of the wire (30) are separately positioned in two wiring grooves (22)；Or,
Slot wedge (21) two ends are provided with wiring channel, and the wiring channel forms wiring on the surface of the slot wedge (21)
Hole, the two ends of the wire (30) are located in two wiring channels by the routing hole respectively.
8. motor gas-gap early warning system according to claim 2, it is characterised in that the detection circuit includes voltage/electricity
Flow detection device, the voltage/current detection device is connected between the wire (30) and the controller.
9. motor gas-gap early warning system according to claim 8, it is characterised in that the detection circuit also includes analog quantity
Acquisition module, the analogue collection module is connected between the voltage/current detection device and the controller.
10. motor gas-gap early warning system according to any one of claim 1 to 9, it is characterised in that the motor gas-gap
Early warning system also includes alarm module, and the alarm module is connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621355570.3U CN206226220U (en) | 2016-12-09 | 2016-12-09 | Motor gas-gap early warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621355570.3U CN206226220U (en) | 2016-12-09 | 2016-12-09 | Motor gas-gap early warning system |
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| Publication Number | Publication Date |
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| CN206226220U true CN206226220U (en) | 2017-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621355570.3U Active CN206226220U (en) | 2016-12-09 | 2016-12-09 | Motor gas-gap early warning system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505111A (en) * | 2017-08-29 | 2017-12-22 | 大连理工大学 | The marine environment compatibility test device of large-tonnage FLNG boat-carrying compressor models |
| CN107643549A (en) * | 2017-10-13 | 2018-01-30 | 国电大渡河流域水电开发有限公司龚嘴水力发电总厂 | Contactless generating set air gap foreign matter on-line checking alarm structure and alarm method |
| CN108494174A (en) * | 2018-04-09 | 2018-09-04 | 新疆金风科技股份有限公司 | Measurement of air gap device and wind power generating set |
| CN109973227A (en) * | 2019-04-18 | 2019-07-05 | 江西科技师范大学 | A kind of electric machine rotor touches the shutdown protector to rub |
| CN110768471A (en) * | 2019-10-25 | 2020-02-07 | 上海品星防爆电机有限公司 | Motor anti-sweeping boring device |
| CN111896279A (en) * | 2020-07-17 | 2020-11-06 | 南京理工大学 | Linear motor train running gear fault diagnosis method based on envelope analysis |
| CN113014042A (en) * | 2019-12-20 | 2021-06-22 | 新疆金风科技股份有限公司 | Air gap measuring device and method for motor and wind generating set |
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2016
- 2016-12-09 CN CN201621355570.3U patent/CN206226220U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505111A (en) * | 2017-08-29 | 2017-12-22 | 大连理工大学 | The marine environment compatibility test device of large-tonnage FLNG boat-carrying compressor models |
| CN107643549A (en) * | 2017-10-13 | 2018-01-30 | 国电大渡河流域水电开发有限公司龚嘴水力发电总厂 | Contactless generating set air gap foreign matter on-line checking alarm structure and alarm method |
| CN107643549B (en) * | 2017-10-13 | 2024-03-01 | 国能大渡河流域水电开发有限公司龚嘴水力发电总厂 | Non-contact type generator set air gap foreign matter on-line detection alarm structure and alarm method |
| CN108494174A (en) * | 2018-04-09 | 2018-09-04 | 新疆金风科技股份有限公司 | Measurement of air gap device and wind power generating set |
| CN108494174B (en) * | 2018-04-09 | 2019-06-04 | 新疆金风科技股份有限公司 | Measurement of air gap device and wind power generating set |
| CN109973227A (en) * | 2019-04-18 | 2019-07-05 | 江西科技师范大学 | A kind of electric machine rotor touches the shutdown protector to rub |
| CN110768471A (en) * | 2019-10-25 | 2020-02-07 | 上海品星防爆电机有限公司 | Motor anti-sweeping boring device |
| CN113014042A (en) * | 2019-12-20 | 2021-06-22 | 新疆金风科技股份有限公司 | Air gap measuring device and method for motor and wind generating set |
| CN113014042B (en) * | 2019-12-20 | 2022-10-04 | 新疆金风科技股份有限公司 | Air gap measuring device and method for motor and wind generating set |
| CN111896279A (en) * | 2020-07-17 | 2020-11-06 | 南京理工大学 | Linear motor train running gear fault diagnosis method based on envelope analysis |
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