CN104865443B - The automatic measurement system and its method of work of motor hot resistance - Google Patents
The automatic measurement system and its method of work of motor hot resistance Download PDFInfo
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- CN104865443B CN104865443B CN201510239359.9A CN201510239359A CN104865443B CN 104865443 B CN104865443 B CN 104865443B CN 201510239359 A CN201510239359 A CN 201510239359A CN 104865443 B CN104865443 B CN 104865443B
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Abstract
The invention discloses a kind of automatic measurement system and its method of work of motor hot resistance, using the automatic measurement system of motor hot resistance provided in an embodiment of the present invention, the measurement of whole motor hot resistance can be completed by Automated condtrol, make the measurement work of testing crew more easy to be light；In addition, in measurement process, the inaccuracy of timing or reading will not be caused because of human factor and causes test failure, measurement accuracy is improved, avoids the phenomenon that testing crew is tested by the machinery of high speed rotation, considerably increase experiment security.
Description
Technical field
The present invention relates to motor test technical field, more particularly to a kind of automatic measurement system of motor hot resistance, goes back
It is related to the method for work of the automatic measurement system of the motor hot resistance.
Background technology
In the standards such as GB/T 25123.2, IEC 60349-4 and TB/T 1704, the temperature rise test of motor is to do
Project, its temperature rise are directly connected to the quality of a motor performance, and therefore, accurate measurement winding temperature rise is critically important.Marked in correlation
In standard, the measuring method of temperature rise has also carried out explicitly stated, and the temperature rise measuring method (electric-resistivity method) that industry is usually taken includes
Following steps：(1) cooling wind is closed；(2) break and accompany the power supply of examination motor；(3) drop subject motor speed, at the same time needs 1 people past
Measure field send stopwatch；(4) subject motor side electric brake is drawn；(5) making resistivity-measuring devices, (microhmmeter or other resistance measurements are set
It is standby) clamp given winding；(6) it is powered to resistivity-measuring devices；(7) DATA REASONING is carried out by the time interval of standard requirement, with
Obtain the centrifugal pump of given winding resistance, data of the obtained centrifugal pump as extrapolation dump transient temperature rise；(8) data are intended
Close, i.e., dump moment is extrapolated to from the time with these centrifugal pumps, using the result of data fitting as dump moment
The resistance value of given winding；(9) according to test formula Δ t=(R2-R1)(X+t1)/R1-(t2-t1) and previous step obtain
Dump moment gives the resistance value R of winding2, temperature rise Δ t is calculated, X represents shutdown transient coolant temperature in formula, for
Copper conductor winding X is 234.5 DEG C, is 225 DEG C for aluminum conductor winding X；Δ t represents temperature rise；R1Represent that on-test (is powered
Before, environment temperature t1) given winding resistance value, unit is ohm；R2When expression reaches off-test after stable state (i.e.
Shutdown transient, environment temperature t2) given winding resistance value, unit is ohm.
Measuring method of the above-mentioned steps (1) to step (8) for hot resistance in motor temperature-raising experiment in the prior art, the survey
The defects of amount method, is：
1) measuring method is artificial measuring method (not occurring automation solutions also at present), is easily gone out in test process
Existing human error, and cause test data inaccuracy or test failure；Test process is usually required more than four people while grasped
Make, required testing crew is too many, it is desirable to each human users' step coordinating and unifying；Artificial reading can not ensure the accurate of data
Property, so as to can not correctly reflect the temperature rise of machine winding；Further, since correlation testing crew needs also to exist in motor in measurement
Testing ground is just advanceed to during operating to prepare, therefore influences the personal safety of testing crew；
2) generally directed to the temperature rise test of heavy-duty motor, its test period and energy consumption are all very big, if occur because
Artificial origin causes the measurement of last hot resistance to fail, or the inaccuracy of measurement, loses and must be incorporated into caused by long-time
In the limit of consideration of cost.
The content of the invention
The technical problems to be solved by the invention are the measuring methods of hot resistance in motor temperature-raising experiment in the prior art
The defects of existing：During motor stopping, the requirement used time timing and equipment coordination is very high, and this method is manual measurement side
Method, during experiment, it usually needs more than four people operated simultaneously, it is artificial caused by test error it is very big, often result in
Winding temperature rise is inferred inaccurate, it is impossible to the temperature rise of correct reflection machine winding, while can also influence the personal safety of testing crew；
In addition, for heavy-duty motor temperature rise test, lose and must be incorporated into the limit of consideration of cost caused by long-time temperature rise error.
In order to solve the above-mentioned technical problem, the invention provides a kind of automatic measurement system and its work of motor hot resistance
Make method.
According to the first aspect of the invention, there is provided a kind of automatic measurement system of motor hot resistance, it includes accompanying
Examination motor, torquemeter, controller and the first current transformer, the second current transformer, the first switching dress for being controlled by the controller
Put, the second switching device, the 3rd switching device, the 4th switching device, winding change-over switch, electric resistance measuring apparatus and for cooling down
It is tested the ventilation unit of the three-phase windings of motor；
The output shaft for accompanying examination motor engages connection by the torquemeter with the output shaft of the subject motor；
The three-phase windings for accompanying examination motor pass through the 3rd switching device and the first current transformer joint test electricity
Source；
The three-phase windings of the subject motor connect the examination by first switching device with second current transformer
Electrical verification source；Described in the three-phase windings of the subject motor connect also by second switching device with the winding change-over switch
Electric resistance measuring apparatus；The electric resistance measuring apparatus connects power supply by the 4th switching device.
Preferably, the winding change-over switch includes being controlled by the first relay, the second relay of the controller
Device, the 3rd relay and the 4th relay；
The U phase windings of the subject motor normally opened touch by the first of second switching device and first relay
Point connects the electric resistance measuring apparatus；
The W phase windings of the subject motor normally opened touch by the second of second switching device and second relay
Point connects the electric resistance measuring apparatus；
One end for being used to connect the electric resistance measuring apparatus of first normally opened contact passes through the 3rd relay
3rd normally opened contact connects the described for connecting of second normally opened contact with the 4th normally opened contact of the 4th relay
One end of electric resistance measuring apparatus；3rd normally opened contact is used to connect one end of the 4th normally opened contact by described the
The V phase windings of the two switching devices connection subject motor.
Preferably, the automatic measurement system also includes protection switching device, and the three-phase windings of the subject motor lead to
Cross second switching device, the winding change-over switch connects the electric resistance measuring apparatus with the protection switching device.
According to the second aspect of the invention, there is provided a kind of work of the automatic measurement system of above-mentioned motor hot resistance
Method, it includes：
The controller closes first switching device and the 3rd switching device, and accompany described in running examination motor and
The subject motor；
When the subject motor meets default thermal stable condition, the controller disconnects first switching device,
Start simultaneously at and examination motor reduction operation is accompanied described in timing, the closing ventilation unit and control；
When it is described accompany the rotating speed of examination motor to be reduced to zero when the controller judge whether accumulative timing is less than the first pre- timing
Between；If it is, the controller closes second switching device after second scheduled time, and closing the second switching dress
The resistance of the winding of the electric resistance measuring apparatus measurement subject motor is controlled after the 3rd scheduled time postponed.
Preferably, the controller controls the resistance of the winding of the electric resistance measuring apparatus measurement subject motor,
Including：
The controller adjusts the winding change-over switch to designated state, so that the electric resistance measuring apparatus is according to pre-
If the resistance of the specified phase winding of motor is tested described in interval measurement；Or
The controller adjusts the state of the winding change-over switch according to predetermined interval, so that the electric resistance measuring apparatus
The resistance of the three-phase windings of the circulation measurement subject motor.
Preferably, methods described also includes：
When judging that the electric resistance measuring apparatus is in idle condition, the controller disconnects the 4th switching dress
Put, when judging that the electric resistance measuring apparatus is in running order, close the 4th switching device.
According to the second aspect of the invention, there is provided another work of the automatic measurement system of above-mentioned motor hot resistance
Make method, it includes：
The controller closes first switching device and the 3rd switching device, and accompany described in running examination motor and
The subject motor；
When the subject motor meets default thermal stable condition, the controller disconnects the 3rd switching device simultaneously
Second current transformer is controlled gradually to reduce the driving current of the subject motor, and under the driving current of the subject motor
When dropping to the 80% of predetermined current, close the ventilation unit and start timing；
When the rotating speed of the subject motor is reduced to zero, the controller judges whether accumulative timing is less than the first pre- timing
Between；If it is, the controller closes second switching device after second scheduled time, and closing the second switching dress
The resistance of the winding of the electric resistance measuring apparatus measurement subject motor is controlled after the 3rd scheduled time postponed.
Preferably, the controller controls the resistance of the winding of the electric resistance measuring apparatus measurement subject motor,
Including：
The controller adjusts the winding change-over switch to designated state, so that the electric resistance measuring apparatus is according to pre-
If the resistance of the specified phase winding of motor is tested described in interval measurement；Or
The controller adjusts the state of the winding change-over switch according to predetermined interval, so that the electric resistance measuring apparatus
The resistance of the three-phase windings of the circulation measurement subject motor.
Preferably, methods described also includes：When judging that the electric resistance measuring apparatus is in idle condition, the control
Device processed disconnects the 4th switching device, when judging that the electric resistance measuring apparatus is in running order, closure described the
Four switching devices.
Compared with prior art, one or more of such scheme embodiment can have the following advantages that or beneficial to effect
Fruit：
Using the automatic measurement system of motor hot resistance provided in an embodiment of the present invention, the survey of whole motor hot resistance
Amount can be completed by Automated condtrol, make the measurement work of testing crew more easy to be light；In addition, in measurement process, no
Test failure can be caused because human factor causes the inaccuracy of timing or reading, improve measurement accuracy, avoid experiment
The phenomenon that personnel are tested by the machinery of high speed rotation, considerably increases experiment security.Generally speaking, the present invention establishes
In prolonged practical experience, have to the situations of the various pieces of whole device and consider, reduce the labor of experimenter
Fatigue resistance, human cost is saved, added experiment security, and improve measurement accuracy.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that or understood by implementing the present invention.The purpose of the present invention and other advantages can be by wanting in specification, right
Specifically noted structure is sought in book and accompanying drawing to realize and obtain.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be provided commonly for explaining the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 shows the structural representation of the automatic measurement system of motor hot resistance of the embodiment of the present invention；
Fig. 2 shows the principle schematic of back-to-back testing system；
Fig. 3 shows that a kind of flow of the method for work of the automatic measurement system of motor hot resistance of the embodiment of the present invention is shown
It is intended to；And
Fig. 4 shows another flow of the method for work of the automatic measurement system of motor hot resistance of the embodiment of the present invention
Schematic diagram.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, and how the present invention is applied whereby
Technological means solves technical problem, and the implementation process for reaching technique effect can fully understand and implement according to this.Need to illustrate
As long as not forming conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
The technical scheme formed is within protection scope of the present invention.
The defects of measuring method to solve hot resistance in motor temperature-raising experiment in the prior art is present：1) the measurement side
Method is artificial measuring method (not occurring automation solutions also at present), human error easily occurs in test process, and is caused
Test data inaccuracy or test failure；Test process is usually required more than four people while operated, and required testing crew is too
It is more, it is desirable to everyone's operating procedure coordinating and unifying；Artificial reading can not ensure the accuracy of data, so as to can not correctly reflect electricity
The temperature rise of machine winding；Further, since correlation testing crew needs also just to advance to experiment in the running now in motor in measurement
Field is prepared, therefore influences the personal safety of testing crew；2) generally directed to the temperature rise test of heavy-duty motor, its test period and
Energy consumption is all very big, if occur causing the measurement of last hot resistance to fail because of artificial origin, or the inaccuracy of measurement,
Loss must be incorporated into the limit of consideration of cost caused by long-time, and the embodiments of the invention provide a kind of motor hot resistance
Automatic measurement system and its method of work.
As shown in figure 1, it is the structural representation of the automatic measurement system of motor hot resistance of the embodiment of the present invention.This implementation
The automatic measurement system of example, it is main to include accompanying examination motor 1, torquemeter 3, controller (not shown in accompanying drawing) and be controlled by controlling
The first current transformer 4, the second current transformer 5, the first switching device KM1, the second switching device KM2, the 3rd switching device of device processed
KM3, the 4th switching device K5, winding change-over switch 6, electric resistance measuring apparatus 7 and the three-phase windings for cooling down subject motor 2
Ventilation unit (not shown in accompanying drawing).
Specifically, it is trustee's testing equipment to accompany examination motor 1, and subject motor 2 is commission method, apparatus.Accompany examination motor 1
Output shaft engages connection by torquemeter 3 with being tested the output shaft of motor 2, can be surveyed by the velocity sensor that torquemeter 3 carries
Go out the rotating speed accompanied examination motor 1 and be tested the output shaft of motor 2.In addition, the three-phase windings of examination motor 1 are accompanied to pass through the 3rd switching device
KM3 and the joint test power supply of the first current transformer 4；The three-phase windings of subject motor 2 pass through the first switching device KM1 and the second unsteady flow
The joint test power supply of device 5.As can be seen that said structure constitutes back-to-back (Back-to-Back) experiment system as shown in Figure 2
System.With reference to IEC 61377-3：Related description in 2002 for back-to-back testing system understands that back-to-back testing system is mutual
The basis of feedback formula AC drive experiment system, it is by two sets of current transformer-asynchronous traction motors identical, mains side is in parallel
It is in series back-to-back.When inverter is powered to asynchronous traction motor, if frequency of supply turns higher than asynchronous traction motor
Fast frequency (i.e. slip frequency is just), then motor is run in motoring condition, absorbs energy from power network by inverter.On the contrary, such as
Fruit frequency of supply is less than the speed-frequency (i.e. slip frequency is negative) of asynchronous traction motor, then motor is run in generating state, leads to
Cross inverter and feed back energy to DC side.Back-to-back testing principle is applied equally to permasyn morot.
In the present embodiment by accompanying examination motor 1, subject motor 2, the first current transformer 4, the second current transformer 5, the first switching to fill
Put in the back-to-back testing system that KM1 and the 3rd switching device KM3 is formed, accompany load of the examination motor 1 as subject motor 2, lead to
Cross the load change that the runing adjustment subject motor 2 of examination motor 1 is accompanied in control.
In addition, the three-phase windings of subject motor 2 also connect resistance by the second switching device KM2 and winding change-over switch 6
Measurement apparatus 7.Electric resistance measuring apparatus 7 passes through the 4th switching device K5 connection power supplies.Here, by controlling the second switching to fill
The disconnection for putting KM2 realizes whether the interlock circuit for measuring the resistance for the winding to being tested motor 2 connects with closure
Enter above-mentioned automatic measurement system.Whether realized by controlling the 4th switching device K5 disconnection and closure to electric resistance measuring apparatus
7 are powered.State by adjusting winding change-over switch 6 switches the three-phase windings of subject motor 2.Cut by adjusting winding
The state switching measurand of changing device 6 is to be tested UV phase windings, UW phase windings or the VW phase windings of motor 2.For winding
The concrete structure of switching device 6 will be hereinafter set forth in.
It is pointed out that controller not shown in Fig. 1, and related control cabling and data signal transmission cabling.
Using the automatic measurement system of the motor hot resistance described in the present embodiment, the measurement of whole motor hot resistance can
Completed by Automated condtrol, make the measurement work of testing crew more easy to be light；In addition, in measurement process, Bu Huiyin
The inaccuracy for causing timing or reading for human factor causes test failure, improves measurement accuracy, avoids testing crew
The phenomenon tested by the machinery of high speed rotation, considerably increases experiment security.Generally speaking, the present invention is established in length
In the practical experience of time, have to the situations of the various pieces of whole device and consider, the work for reducing experimenter is strong
Degree, has saved human cost, has added experiment security, and improve measurement accuracy.
In a preferred embodiment of the invention, the first switching device KM1 is preferably the normally opened contact of first contactor, the
Two switching device KM2 are preferably the normally opened contact of second contactor, and the 3rd switching device KM3 is preferably the normally opened of the 3rd contactor
Contact, the 4th switching device K5 are preferably the normally opened contact of relay.Here, first contactor, second contactor, the 3rd contact
Device and relay are controlled by controller.Electric resistance measuring apparatus 7 is preferably accurate microhmmeter or other for measuring resistance
Device.
In a preferred embodiment of the invention, winding change-over switch 6 includes the first relay for being controlled by controller
K1, the second relay K2, the 3rd relay K3 and the 4th relay K4.
Specifically, the U phase windings for being tested motor 2 pass through the first normally opened of the second switching device KM2 and the first relay K1
Contact portion electric resistance measuring apparatus 7.It is tested the W phase windings of motor 2 pass through the second switching device KM2 and the second relay K2 the
Two normally opened contacts connect electric resistance measuring apparatus 7.
Normally opened touched by the 3rd of the 3rd relay K3 one end of electric resistance measuring apparatus 7 of being used to connect of first normally opened contact
Point connects one end for being used to connect electric resistance measuring apparatus 7 of the second normally opened contact with the 4th relay K4 the 4th normally opened contact；
One end for being used to connect the 4th normally opened contact of 3rd normally opened contact is tested the V phases of motor 2 by the second switching device KM2 connections
Winding.
In the present embodiment, by suitably adjusting the first relay K1, the second relay K2, the 3rd relay K3 and the 4th
Relay K4 switch coordinates, to be surveyed respectively to the resistance of the UV phase windings of subject motor 2, UW phase windings and VW phase windings
Amount.
In detail, reference picture 1, when controller is closed at the first relay K1 the first normally opened contact and the 4th relay
During K4 four normally opened contact, Systematic selection UV phase windings are as measurement object.When controller is closed at the first relay K1
The first normally opened contact and the second relay K2 the second normally opened contact when, Systematic selection UW phase windings are as measurement object.When
Controller be closed at the second relay K2 the second normally opened contact and the 3rd relay K3 three normally opened contacts when, system choosing
VW phase windings are selected as measurement object.
Especially, in a preferred embodiment of the invention, referring now still to Fig. 1, above-mentioned automatic measurement system also includes protection
Switching device K6.The three-phase windings for being tested motor 2 pass through the second switching device KM2, winding change-over switch 6 and protection switching device
K6 connections electric resistance measuring apparatus 7.Therefore, when automatic measurement system breaks down (such as overcurrent or overvoltage), control
Device can disconnect protection switching device K6 in time, with effective protective resistance measurement apparatus 7.Here, protect switching device K6 preferred
To be controlled by the normally opened contact of the relay of controller.Especially, protection switching device K6 or the second switching device KM2 may be used also
So that with manual control function, when testing crew finds that automatic measurement system breaks down, such as testing crew discovery should
When the motor of stalling still has rotating speed, for the safety of electric resistance measuring apparatus 7, now testing crew manually disconnects in time protects switching
Device K6 or the second switching device KM2, so as to ensure that situation about failing can be shut down taking human as controlling.
Correspondingly, the embodiment of the present invention additionally provides the method for work of above-mentioned automatic measurement system.Fig. 3 shows the present invention
A kind of schematic flow sheet of the method for work of the automatic measurement system of embodiment motor hot resistance.The work that the present embodiment is related to
Method is correspondingly tested the braking method of the obstructed electric current of motor 2.As shown in figure 3, automatic measurement system described in the present embodiment
Method of work, mainly include the following steps that：
Step 101：Controller closes the first switching device KM1 and the 3rd switching device KM3, and runs and accompany the examination He of motor 1
It is tested motor 2.
Step 102：Controller judges to be tested whether motor 2 meets default thermal stable condition.
Specifically, controller control accompanies examination motor 1 and subject motor 2 to run first, and by adjusting the He of the first current transformer 4
Second current transformer 5, makes subject motor 2 meet default thermal stable condition as early as possible.Judge whether motor meets to preset to coordinate
Thermal stable condition, it is necessary to motor heating position (casing or winding) place set temperature-detecting device, pass through temperature detection
The signal of device feedback, controller calculates whether motor reaches thermal equilibrium state automatically by thermal balance algorithm, if motor reaches
To thermal balance shape, it is determined that motor meets default thermal stable condition.Due to judging whether motor reaches the side of thermal equilibrium state
Method is the determination methods that those skilled in the art routinely use, therefore no longer carries out expansion explanation herein.
Step 103：When subject motor 2 meets default thermal stable condition, controller disconnects the first switching device KM1,
Timing is started simultaneously at, the first switching device KM1 is disconnected, closes ventilation unit and control and accompany the examination fall-back of motor 1.
Specifically, for using the braking method for being tested 2 obstructed electric current of motor, taking cut-out subject motor 2 main circuit (i.e. disconnected
Open the first switching device KM1) moment be used as " cooling starts " moment, also need to close ventilation unit at this moment and pass through control
First current transformer 4 makes to accompany the examination fall-back of motor 1, while controller starts timing.
Step 104：Whether the controller accumulative time is less than the first pre- timing when judging to accompany the rotating speed of examination motor 1 to be down to zero
Between.
Step 105：When controller is judged to accompany the rotating speed of examination motor 1 to be down to zero, its accumulative time, it is predetermined to be less than first
During the time, controller closes the second switching device KM2 after second scheduled time, and after the second switching device KM2 is closed
The resistance of the winding of the measurement subject motor 2 of electric resistance measuring apparatus 7 is controlled after 3rd scheduled time.
Specifically, first scheduled time was preferably 2min, and second scheduled time was preferably 1s, and the 3rd scheduled time was preferably
1s.If the accumulative time is less than 2min when accompanying examination motor 1 to stall, controller is since " the cooling " moment, control
Device closes the second switching device KM2 after the 1s that is delayed first, resistance measuring circuit is accessed in automatic measurement system, Ran Hou
Start to measure subject motor 2 with reference to the control electric resistance measuring apparatus 7 of winding change-over switch 6 after closing the second switching device KM2 1s
Winding resistance.
Here, it is preferably 2min by first scheduled time, it is intended to meet the standards such as IEC60349-2 and IEC60349-4
It is required that：Stop, its resistance it can not can not start the large-scale electricity of measurement in " cooling starts " later 45s in time for some
Machine, it should consult to start using special braking scheme and extension between user and manufacturer the time of measurement, but must be " cooling is opened
Start to measure within beginning " 2min.
It is briefly described as follows the determination method of the motor temperature rise based on the method described in the present embodiment：First, Fig. 1 institutes are utilized
The cold-state resistance for the automatic measurement system measurement motor shown, i.e. controller disconnect the first switching device KM1 and draw three switching devices,
The second switching device KM2 and the 4th switching device K5 is only closed, regulation winding change-over switch 6 exists to measure subject motor 2 respectively
The resistance of the resistance of UV phase windings, the resistance of UW phase windings and VW phase windings under cold conditions (state of the subject off-duty of motor 2).
Secondly, extrapolated " cooling starts " the moment motor of centrifugal pump of motor hot resistance is obtained using the method described in the present embodiment
Hot resistance.Finally, according to formula Δ t=(R2-R1)(X+t1)/R1-(t2-t1) calculate motor temperature rise.
Another method is, after the centrifugal pump of motor hot resistance is obtained using the method described in the present embodiment, utilizes
The calculation formula of above-mentioned motor temperature rise calculates motor temperature rise centrifugal pump corresponding to various discrete value respectively.Finally utilize motor temperature rise
The temperature rise of extrapolated " cooling starts " the moment motor of centrifugal pump.Data Extrapolation method is the method for data fitting, specifically, by electricity
The centrifugal pump of machine temperature rise is depicted as the function curve of time, and wherein temperature rise coordinate uses logarithmic scale, and time coordinate is using linear
Scale.Then at the time of by the curve extrapolation drawn to " cooling starts ", to obtain the motor temperature rise at " cooling starts " moment.
Therefore,, can under the mode of braking using subject 2 obstructed electric current of motor using the method described in the present embodiment
The accurately hot resistance of measurement subject motor 2, so as to establish base for the accurate motor temperature rise for determining " cooling starts " moment
Plinth.Using the method described in the present embodiment, reduce the labor intensity of experimenter, saved human cost, add experiment peace
Quan Xing, and improve measurement accuracy.
Fig. 4 shows another flow of the method for work of the automatic measurement system of motor hot resistance of the embodiment of the present invention
Schematic diagram.The method of work that the present embodiment is related to correspondingly is tested the alive braking method of motor 2.As shown in figure 4, this implementation
The method of work of automatic measurement system described in example, is mainly included the following steps that：
Step 201：Controller closes the first switching device KM1 and the 3rd switching device KM3, and runs and accompany the examination He of motor 1
It is tested motor 2.
Step 202：Controller judges to be tested whether motor 2 meets default thermal stable condition.
Step 203：When subject motor 2 meets default thermal stable condition, controller disconnects the 3rd switching device KM3 simultaneously
Controlling the second current transformer 5 gradually reduces the driving current of subject motor 2, and subject motor 2 driving current drop to it is default
Electric current 80% when, close ventilation unit and simultaneously start timing.
Step 204：Judge whether the controller accumulative time is less than the first pre- timing when the rotating speed for being tested motor 2 is down to zero
Between.
Step 205：When the rotating speed for being tested motor 2 is reduced to zero, controller judges that accumulative timing was less than for first scheduled time
When, controller closes the second switching device KM2, and the after the second switching device KM2 is closed the 3rd after second scheduled time
The resistance of the winding of the measurement subject motor 2 of electric resistance measuring apparatus 7 is controlled after the scheduled time.
The method of work that the present embodiment is related to correspondingly is tested the alive braking method of motor 2, compares a upper embodiment
The braking method of the obstructed electric current of motor 2 is tested, the method for the present embodiment the difference is that only " cooling starts " moment
Determination mode.
Specifically, in the present embodiment, make at the time of the driving current for being tested motor 2 being dropped into the 80% of predetermined current
For " cooling starts " moment, it is intended to meet the requirement of the standards such as IEC60349-2 and IEC60349-4：It is preferential to use subject motor 2
The braking method of obstructed electric current, in this case, when taking the moment of the preceding cut-out motor main circuit of braking as " cooling starts "
Carve, all separate ventilations are cut off in this moment.If above-mentioned braking method can not be used, the subject belt current of motor 2 can be used
Braking method, as long as the method taken can be such that motor stalls rapidly, and load current can keep rational permanent during braking
It is fixed." cooling starts " moment should be the moment that load current drops to 80% test value electric current, at this moment, should cut off ventilation.
The determination method of motor temperature rise based on the method described in the present embodiment is similar with a upper embodiment, therefore herein no longer
Carry out expansion explanation.
Therefore, using the method described in the present embodiment, under using 2 alive mode of braking of motor is tested, Neng Goujing
The hot resistance of subject motor 2 really is measured, so as to be laid a good foundation for the accurate motor temperature rise for determining " cooling starts " moment.
Using the method described in the present embodiment, reduce the labor intensity of experimenter, saved human cost, add experiment safety
Property, and improve measurement accuracy.
The preferred embodiment of above-mentioned two embodiment of the method is described below：
In a preferred embodiment of the invention, controller only measures the resistance of a certain phase winding of subject motor 2, and root
Motor temperature rise is determined according to the resistance of the phase winding.In this case, controller adjusts winding change-over switch 6 to specified shape
State, so that electric resistance measuring apparatus 7 measures the resistance of the specified phase winding of subject motor 2 according to predetermined interval.For example, controller is only
Measurement subject motor 2 UV phase windings resistance, at this moment controller be closed at the first relay K1 the first normally opened contact and
4th relay K4 the 4th normally opened contact, Systematic selection UV phase windings as the measurement object specified, then controller according to
Predetermined interval measures the resistance of UV phase windings.
In a preferred embodiment of the invention, controller needs to measure resistance, the UW phases of the UV phase windings of subject motor 2
The resistance of winding and the resistance of VW phase windings, and motor temperature rise is determined according to the resistance of this three-phase windings.In this case, control
Device processed adjusts the state of winding change-over switch 6 according to predetermined interval, so that the circulation measurement subject motor 2 of electric resistance measuring apparatus 7
The resistance of three-phase windings.I.e. controller just switches the state of first winding switching device 6 every predetermined interval, to circulate measurement quilt
Try the resistance of the resistance of UV phase windings of motor 2, the resistance of UW phase windings and VW phase windings.
In a preferred embodiment of the invention, when judging that electric resistance measuring apparatus 7 is in idle condition, controller breaks
The 4th switching device K5 is opened, when judging that electric resistance measuring apparatus 7 is in running order, closes the 4th switching device K5.Need
It is noted that the idle condition of electric resistance measuring apparatus 7 is the state that the device does not carry out resistance measurement work, working condition is
The device is carrying out the state of resistance measurement work.In specific implementation process, controller can be accurate according to above-mentioned predetermined interval
Really judge that electric resistance measuring apparatus 7 is to be in working condition in idle condition.
In the present embodiment, the 4th switching device K5 (can also be the second switching device KM2) can be periodically opened and closed
To measure centrifugal pump, power supply for a long time can be avoided to have an impact winding resistance.Certainly, can also if measurement electric current selection is smaller
It is always maintained at closing and is continuously measured.The present embodiment seeks to fill that the requirement of the standards such as IEC60349-2 and IEC60349-4：
If measured using volt-ampere method, for the degree of accuracy necessary to acquisition, it should take sufficiently large electric current, and the current value in itself will not
Influence temperature rise (generally, the value, which is no more than the 10% of rated current, can meet this requirement).
In addition, according to the requirement of the standards such as IEC60349-2 and IEC60349-4, when carrying out motor temperature-raising experiment, also need
To meet as much as possible claimed below：
When the 1st, measuring initial cold-state resistance and hot resistance, it should be read using same measuring method on given winding
All readings；
2nd, during off-test, it should stall motor within the time as short as possible；
3rd, should " cooling starts " after the moment earlier than starting to survey the resistance value of each winding in 45s, and should continue to
Few 5min, the time interval that each winding gradually measures, is no more than 20s in initial 3min planted agent, is hereafter 30s.
While it is disclosed that embodiment as above, but described content only to facilitate understand the present invention and adopt
Embodiment, it is not limited to the present invention.Any those skilled in the art to which this invention pertains, this is not being departed from
On the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But protection scope of the present invention, still it should be subject to the scope of the claims as defined in the appended claims.
Claims (8)
- A kind of 1. automatic measurement system of motor hot resistance, it is characterised in that including accompany examination motor, torquemeter, controller with And it is controlled by the first current transformer of the controller, the second current transformer, the first switching device, the second switching device, the 3rd throws Cutting apparatus, the 4th switching device, winding change-over switch, electric resistance measuring apparatus and for cool down subject motor three-phase windings it is logical Wind apparatus；The output shaft for accompanying examination motor engages connection by the torquemeter with the output shaft of the subject motor；The three-phase windings for accompanying examination motor pass through the 3rd switching device and the first current transformer joint test power supply；The three-phase windings of the subject motor connect the experiment electricity by first switching device with second current transformer Source；The three-phase windings of the subject motor also connect the resistance by second switching device with the winding change-over switch Measurement apparatus；The electric resistance measuring apparatus connects power supply by the 4th switching device；Wherein, the winding change-over switch include being controlled by the first relay of the controller, the second relay, the 3rd after Electrical equipment and the 4th relay；The U phase windings of the subject motor are connected by the first normally opened contact of second switching device and first relay Connect the electric resistance measuring apparatus；The W phase windings of the subject motor are connected by the second normally opened contact of second switching device and second relay Connect the electric resistance measuring apparatus；One end for being used to connect the electric resistance measuring apparatus of first normally opened contact is by the 3rd of the 3rd relay Normally opened contact connected with the 4th normally opened contact of the 4th relay second normally opened contact be used for connect the resistance One end of measurement apparatus；Thrown by described second one end for being used to connect the 4th normally opened contact of 3rd normally opened contact The V phase windings of the cutting apparatus connection subject motor.
- 2. the automatic measurement system of motor hot resistance according to claim 1, it is characterised in that also include protection switching Device, the three-phase windings of the subject motor are thrown by second switching device, the winding change-over switch and the protection Cutting apparatus connects the electric resistance measuring apparatus.
- 3. a kind of method of work of the automatic measurement system of motor hot resistance, it is characterised in that the automatic measurement system is The automatic measurement system of motor hot resistance as claimed in claim 1 or 2, methods described include：The controller closes first switching device and the 3rd switching device, and examination motor and described is accompanied described in running It is tested motor；When the subject motor meets default thermal stable condition, the controller disconnects first switching device, simultaneously Start to accompany examination motor reduction operation described in timing, the closing ventilation unit and control；When it is described accompany the rotating speed of examination motor to be reduced to zero when the controller judge whether accumulative timing was less than for first scheduled time；Such as Fruit is that then the controller closes second switching device after second scheduled time, and after the second switching device is closed The 3rd scheduled time after control the electric resistance measuring apparatus measurement subject motor winding resistance.
- 4. according to the method for claim 3, it is characterised in that the controller controls the electric resistance measuring apparatus measurement institute The resistance of the winding of subject motor is stated, including：The controller adjusts the winding change-over switch to designated state, so that between the electric resistance measuring apparatus is according to presetting Every the resistance for the specified phase winding for measuring the subject motor；OrThe controller adjusts the state of the winding change-over switch according to predetermined interval, so that the electric resistance measuring apparatus circulates Measure the resistance of the three-phase windings of the subject motor.
- 5. according to the method for claim 4, it is characterised in that also include：When judging that the electric resistance measuring apparatus is in idle condition, the controller disconnects the 4th switching device, directly To when judging that the electric resistance measuring apparatus is in running order, the 4th switching device is closed.
- 6. a kind of method of work of the automatic measurement system of motor hot resistance, it is characterised in that the automatic measurement system is The automatic measurement system of motor hot resistance as claimed in claim 1 or 2, methods described include：The controller closes first switching device and the 3rd switching device, and examination motor and described is accompanied described in running It is tested motor；When the subject motor meets default thermal stable condition, the controller disconnects the 3rd switching device and controlled Second current transformer gradually reduces the driving current of the subject motor, and drops in the driving current of the subject motor Predetermined current 80% when, close the ventilation unit and start timing；When the rotating speed of the subject motor is reduced to zero, the controller judges whether accumulative timing was less than for first scheduled time；Such as Fruit is that then the controller closes second switching device after second scheduled time, and after the second switching device is closed The 3rd scheduled time after control the electric resistance measuring apparatus measurement subject motor winding resistance.
- 7. according to the method for claim 6, it is characterised in that the controller controls the electric resistance measuring apparatus measurement institute The resistance of the winding of subject motor is stated, including：The controller adjusts the winding change-over switch to designated state, so that between the electric resistance measuring apparatus is according to presetting Every the resistance for the specified phase winding for measuring the subject motor；OrThe controller adjusts the state of the winding change-over switch according to predetermined interval, so that the electric resistance measuring apparatus circulates Measure the resistance of the three-phase windings of the subject motor.
- 8. according to the method for claim 7, it is characterised in that also include：When judging that the electric resistance measuring apparatus is in idle condition, the controller disconnects the 4th switching device, directly To when judging that the electric resistance measuring apparatus is in running order, the 4th switching device is closed.
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| CN105988052B (en) * | 2015-10-23 | 2019-02-22 | 安徽中认倍佳科技有限公司 | Household electrical appliances motor winding temperature rise is in apparatus test device and method |
| CN111103538A (en) * | 2018-10-26 | 2020-05-05 | 株洲中车时代电气股份有限公司 | Automatic test system for temperature rise of three-phase asynchronous alternating current motor winding |
| CN113138613A (en) * | 2021-04-13 | 2021-07-20 | 合肥巨一动力系统有限公司 | Method for reducing over-regulation of rotating speed of twin-dragging system |
| CN113267271B (en) * | 2021-05-07 | 2023-11-28 | 广东白云学院 | Thermal state winding temperature rise test system and method |
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