CN104865443A - Automatic measurement system of motor hot resistance and work method thereof - Google Patents
Automatic measurement system of motor hot resistance and work method thereof Download PDFInfo
- Publication number
- CN104865443A CN104865443A CN201510239359.9A CN201510239359A CN104865443A CN 104865443 A CN104865443 A CN 104865443A CN 201510239359 A CN201510239359 A CN 201510239359A CN 104865443 A CN104865443 A CN 104865443A
- Authority
- CN
- China
- Prior art keywords
- switching device
- motor
- measuring apparatus
- tested motor
- electric resistance
- 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.)
- Granted
Links
Landscapes
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention discloses an automatic measurement system of motor hot resistance and a work method thereof. By adopting the automatic measurement system of the motor hot resistance, the measurement of the whole motor hot resistance can be completed in an automatic control manner, and the measurement work of a tester is simpler and easier; in addition, in the measuring process, test failures caused by accurate timing or reading which is due to human factors are avoided, the measurement precision is improved, the phenomenon that the tester carries out a test beside a machine rotating at a high speed is avoided, and the test safety is substantially improved.
Description
Technical field
The present invention relates to motor test technical field, particularly relate to a kind of automatic measurement system of motor hot resistance, also relate to the method for work of the automatic measurement system of this 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 all to do project, and its temperature rise is directly connected to the quality of a motor performance, and therefore, Measurement accuracy winding temperature rise is very important.In relevant criterion, the measuring method of temperature rise is also carried out explicitly bright, and the temperature rise measuring method (electric-resistivity method) that industry is taked usually comprises the following steps: (1) closes cooling air; (2) disconnected power supply of accompanying examination motor; (3) fall tested motor speed, meanwhile need 1 people to send stopwatch toward measure field; (4) tested motor side electric brake is drawn; (5) resistivity-measuring devices (microhmmeter or other resistivity-measuring devices) is made to clamp given winding; (6) be energized to resistivity-measuring devices; (7) carry out DATA REASONING by the time interval of standard-required, to obtain the discrete value of given winding resistance, the discrete value obtained is as the data of extrapolation dump transient temperature rise; (8) data fitting, is namely extrapolated to dump moment by these discrete values from the time, using the resistance value of the result of data fitting as dump moment given winding; (9) according to test formula Δ t=(R
2-R
1) (X+t
1)/R
1-(t
2-t
1) and previous step obtain dump moment given winding resistance value R
2, calculate temperature rise Δ t, in formula, X represents shutdown transient coolant temperature, is 234.5 DEG C for copper conductor winding X, is 225 DEG C for aluminum conductor winding X; Δ t represents temperature rise; R
1represent that on-test, (namely before energising, environment temperature was t
1) resistance value of given winding, unit is ohm; R
2represent that (shutdown transient, environment temperature is t when reaching off-test after steady state (SS)
2) resistance value of given winding, unit is ohm.
The measuring method that above-mentioned steps (1) is hot resistance in motor temperature-raising experiment in prior art to step (8), the defect of this measuring method is:
1) this measuring method is artificial measuring method (also not occurring automation solutions at present), easily occurs human error in test process, and causes the inaccurate or test failure of test figure; Test process needs more than four people to operate usually simultaneously, and required testing crew is too many, requires each human users's step coordinating and unifying; Artificial reading cannot ensure the accuracy of data, thus correctly can not reflect the temperature rise of motor winding; In addition, prepare because testing crew of being correlated with when measuring needs also just to advance to testing ground in the running at motor, therefore affect the personal safety of testing crew;
2) usually for the temperature rise test of heavy-duty motor, its test period and energy consumption are all very large, if occur because artificial origin causes the measurement failure of last hot resistance, or measurement is inaccurate, and the loss caused for a long time must be included in the limit of consideration of cost.
Summary of the invention
Technical matters to be solved by this invention is the defect that the measuring method of hot resistance in motor temperature-raising experiment in prior art exists: during motor stopping, the requirement used time timing and equipment coordination is very high, and the method is artificial measuring method, in process of the test, more than usual needs four people operate simultaneously, people is that the test error caused is very big, winding temperature rise is often caused to infer inaccurate, correctly can not reflect the temperature rise of motor winding, also can affect the personal safety of testing crew simultaneously; In addition, for heavy-duty motor temperature rise test, the loss that long-time temperature rise error causes must be included in the limit of consideration of cost.
In order to solve the problems of the technologies described above, the invention provides a kind of automatic measurement system and method for work thereof of motor hot resistance.
According to a first aspect of the invention, provide a kind of automatic measurement system of motor hot resistance, it comprises accompanies examination motor, torque gauge, controller and is all controlled by the first current transformer of described controller, the second current transformer, the first switching device, the second switching device, the 3rd switching device, the 4th switching device, winding change-over switch, electric resistance measuring apparatus and the ventilation unit for the three-phase windings that cools tested motor;
The described output shaft of examination motor of accompanying is connected with a joggle by the output shaft of described torque gauge and described tested motor;
The described three-phase windings of examination motor of accompanying is by described 3rd switching device and described first current transformer joint test power supply;
The three-phase windings of described tested motor is connected described experiment power supply by described first switching device with described second current transformer; The three-phase windings of described tested motor is also connected described electric resistance measuring apparatus by described second switching device with described winding change-over switch; Described electric resistance measuring apparatus connects power supply by described 4th switching device.
Preferably, described winding change-over switch comprises the first relay, the second relay, the 3rd relay and the 4th relay that are all controlled by described controller;
The U phase winding of described tested motor is connected described electric resistance measuring apparatus by described second switching device with the first normally opened contact of described first relay;
The W phase winding of described tested motor is connected described electric resistance measuring apparatus by described second switching device with the second normally opened contact of described second relay;
One end for connecting described electric resistance measuring apparatus being connected described second normally opened contact for one end of connecting described electric resistance measuring apparatus by the 3rd normally opened contact of described 3rd relay with the 4th normally opened contact of described 4th relay of described first normally opened contact; The V phase winding of one end by the described tested motor of described second switching device connection for connecting described 4th normally opened contact of described 3rd normally opened contact.
Preferably, described automatic measurement system also comprises protection switching device, and the three-phase windings of described tested motor is connected described electric resistance measuring apparatus by described second switching device, described winding change-over switch with described protection switching device.
According to a second aspect of the invention, provide a kind of method of work of the automatic measurement system of above-mentioned motor hot resistance, it comprises:
Described controller closes described first switching device and described 3rd switching device, and accompanies examination motor and described tested motor described in running;
When described tested motor meets default thermal stable condition, described controller disconnects described first switching device, starts timing simultaneously, closes described ventilation unit and accompanies examination motor reduction to run described in control;
When described accompany the rotating speed of examination motor to reduce to zero time described controller judge whether accumulative timing was less than for first schedule time; If so, then described controller closed described second switching device after second schedule time, and control the resistance that described electric resistance measuring apparatus measures the winding of described tested motor after the 3rd schedule time after closed second switching device.
Preferably, described controller controls the resistance that described electric resistance measuring apparatus measures the winding of described tested motor, comprising:
Described winding change-over switch is adjusted to designated state by described controller, to make described electric resistance measuring apparatus according to the resistance of the appointment phase winding of the described tested motor of predetermined interval measurement; Or
Described controller regulates the state of described winding change-over switch according to predetermined interval, with the resistance making the circulation of described electric resistance measuring apparatus measure the three-phase windings of described tested motor.
Preferably, described method also comprises:
When judging that described electric resistance measuring apparatus is in idle condition, described controller disconnects described 4th switching device, until when judging that described electric resistance measuring apparatus is in running order, and closed described 4th switching device.
According to a second aspect of the invention, provide the another kind of method of work of the automatic measurement system of above-mentioned motor hot resistance, it comprises:
Described controller closes described first switching device and described 3rd switching device, and accompanies examination motor and described tested motor described in running;
When described tested motor meets default thermal stable condition, described controller disconnects described 3rd switching device and controls the drive current that described second current transformer reduces described tested motor gradually, and when the drive current of described tested motor drops to 80% of predetermined current, close described ventilation unit and start timing;
When the rotating speed of described tested motor reduces to zero, described controller judges whether accumulative timing was less than for first schedule time; If so, then described controller closed described second switching device after second schedule time, and control the resistance that described electric resistance measuring apparatus measures the winding of described tested motor after the 3rd schedule time after closed second switching device.
Preferably, described controller controls the resistance that described electric resistance measuring apparatus measures the winding of described tested motor, comprising:
Described winding change-over switch is adjusted to designated state by described controller, to make described electric resistance measuring apparatus according to the resistance of the appointment phase winding of the described tested motor of predetermined interval measurement; Or
Described controller regulates the state of described winding change-over switch according to predetermined interval, with the resistance making the circulation of described electric resistance measuring apparatus measure the three-phase windings of described tested motor.
Preferably, described method also comprises: when judging that described electric resistance measuring apparatus is in idle condition, and described controller disconnects described 4th switching device, until when judging that described electric resistance measuring apparatus is in running order, and closed described 4th switching device.
Compared with prior art, the one or more embodiments in such scheme can have the following advantages or beneficial effect by tool:
The automatic measurement system of the motor hot resistance that the application embodiment of the present invention provides, the measurement of whole motor hot resistance completes by Automated condtrol, makes the surveying work of testing crew more easily easy; In addition, in measuring process, test failure can not be caused because human factor causes the inaccurate of timing or reading, improve measuring accuracy, avoid testing crew in the other phenomenon of carrying out testing of the machinery of High Rotation Speed, considerably increase experimental safe.Generally speaking, the present invention is based upon in long practical experience, has and considers, decrease the labour intensity of experimenter, saved human cost, added experimental safe, and improve measuring accuracy the situation of the various piece of whole device.
Other features and advantages of the present invention will be set forth in the following description, and partly become apparent from instructions, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in instructions, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, with embodiments of the invention jointly for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 shows the structural representation of the automatic measurement system of embodiment of the present invention motor hot resistance;
Fig. 2 shows the principle schematic of back-to-back testing system;
Fig. 3 shows a kind of schematic flow sheet of the method for work of the automatic measurement system of embodiment of the present invention motor hot resistance; And
Fig. 4 shows the another kind of schematic flow sheet of the method for work of the automatic measurement system of embodiment of the present invention motor hot resistance.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical matters whereby, and the implementation procedure reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
Defect for the measuring method solving hot resistance in motor temperature-raising experiment in prior art exists: 1) this measuring method is artificial measuring method (also not occurring automation solutions at present), easily there is human error in test process, and cause the inaccurate or test failure of test figure; Test process needs more than four people to operate usually simultaneously, and required testing crew is too many, requires the coordinating and unifying of everyone's operation steps; Artificial reading cannot ensure the accuracy of data, thus correctly can not reflect the temperature rise of motor winding; In addition, prepare because testing crew of being correlated with when measuring needs also just to advance to testing ground in the running at motor, therefore affect the personal safety of testing crew; 2) usually for the temperature rise test of heavy-duty motor, its test period and energy consumption are all very large, if occur because artificial origin causes the measurement failure of last hot resistance, or measurement is inaccurate, the loss caused for a long time must be included in the limit of consideration of cost, embodiments provides a kind of automatic measurement system and method for work thereof of motor hot resistance.
As shown in Figure 1, be the structural representation of automatic measurement system of embodiment of the present invention motor hot resistance.The automatic measurement system of the present embodiment, mainly comprises and accompanies examination motor 1, torque gauge 3, controller (attached not shown) and be all controlled by the first current transformer 4, second current transformer 5, first switching device KM1 of controller, the second switching device KM2, the 3rd switching device KM3, the 4th switching device K5, winding change-over switch 6, electric resistance measuring apparatus 7 and the ventilation unit (attached not shown) for the three-phase windings that cools tested motor 2.
Particularly, accompany examination motor 1 for trustee's testing equipment, tested motor 2 is consigner's equipment.Accompany the output shaft of examination motor 1 to be connected with a joggle by the output shaft of torque gauge 3 with tested motor 2, the rotating speed of accompanying examination motor 1 and tested motor 2 output shaft measured by the speed pickup carried by torque gauge 3.In addition, accompany the three-phase windings of examination motor 1 by the 3rd switching device KM3 and the first current transformer 4 joint test power supply; The three-phase windings of tested motor 2 is by the first switching device KM1 and the second current transformer 5 joint test power supply.Can find out, said structure constitutes (Back-to-Back) back-to-back pilot system as shown in Figure 2.Known with reference to the related description for back-to-back testing system in IEC 61377-3:2002, back-to-back testing system is the basis of mutually feeding type AC drive experiment system, and it is in series back-to-back by two covers current transformer-asynchronous traction motor identical, that mains side is in parallel.When inverter is powered to asynchronous traction motor, if line frequency is higher than the speed-frequency (namely slip frequency is just) of asynchronous traction motor, then motor is that motoring condition runs, and absorbs energy by inverter from electrical network.On the contrary, if line frequency is lower than the speed-frequency (namely slip frequency is negative) of asynchronous traction motor, then motor is that generating state runs, by inverter to DC side feedback energy.Back-to-back testing principle is applicable to permasyn morot too.
At the present embodiment by the back-to-back testing system of accompanying examination motor 1, tested motor 2, first current transformer 4, second current transformer 5, first switching device KM1 and the 3rd switching device KM3 to form, accompany examination motor 1 as the load of tested motor 2, by controlling the load change of the tested motor 2 of runing adjustment of accompanying examination motor 1.
In addition, the three-phase windings of tested motor 2 is also by the second switching device KM2 and winding change-over switch 6 contact resistance measurement mechanism 7.Electric resistance measuring apparatus 7 connects power supply by the 4th switching device K5.Here, realize whether the interlock circuit be used for the resistance of the winding of tested motor 2 is measured being accessed above-mentioned automatic measurement system with closing by the disconnection that controls the second switching device KM2.Realize whether powering to electric resistance measuring apparatus 7 with closing by the disconnection that controls the 4th switching device K5.By the three-phase windings regulating the state of winding change-over switch 6 to switch tested motor 2.Namely switch by the state of adjustment winding change-over switch 6 UV phase winding, UW phase winding or the VW phase winding that measurand is tested motor 2.Concrete structure for winding change-over switch 6 will be set forth hereinafter in detail.
It is pointed out that not shown controller in Fig. 1, and relevant control cabling and data-signal transmission cabling.
The automatic measurement system of the motor hot resistance of application described in the present embodiment, the measurement of whole motor hot resistance completes by Automated condtrol, makes the surveying work of testing crew more easily easy; In addition, in measuring process, test failure can not be caused because human factor causes the inaccurate of timing or reading, improve measuring accuracy, avoid testing crew in the other phenomenon of carrying out testing of the machinery of High Rotation Speed, considerably increase experimental safe.Generally speaking, the present invention is based upon in long practical experience, has and considers, decrease the labour intensity of experimenter, saved human cost, added experimental safe, and improve measuring accuracy the situation of the various piece of whole device.
In the present invention one preferred embodiment, first switching device KM1 is preferably the normally opened contact of the first contactor, second switching device KM2 is preferably the normally opened contact of the second contactor, 3rd switching device KM3 is preferably the normally opened contact of the 3rd contactor, and the 4th switching device K5 is preferably the normally opened contact of relay.Here, the first contactor, the second contactor, the 3rd contactor and relay are all controlled by controller.Electric resistance measuring apparatus 7 is preferably accurate microhmmeter or other device for measuring resistance.
In the present invention one preferred embodiment, winding change-over switch 6 comprises the first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 that are all controlled by controller.
Particularly, the U phase winding of tested motor 2 passes through the first normally opened contact contact resistance measurement mechanism 7 of the second switching device KM2 and the first relay K 1.The W phase winding of tested motor 2 passes through the second normally opened contact contact resistance measurement mechanism 7 of the second switching device KM2 and the second relay K 2.
One end for contact resistance measurement mechanism 7 of first normally opened contact is connected one end for contact resistance measurement mechanism 7 of the second normally opened contact by the 3rd normally opened contact of the 3rd relay K 3 and the 4th normally opened contact of the 4th relay K 4; The V phase winding being connected tested motor 2 for the one end connecting the 4th normally opened contact by the second switching device KM2 of the 3rd normally opened contact.
In the present embodiment, by suitably regulating the switch of the first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 to coordinate, to measure the resistance of the UV phase winding of tested motor 2, UW phase winding and VW phase winding respectively.
In detail, with reference to Fig. 1, when the 4th normally opened contact of controller the first normally opened contact of closed first relay K 1 and the 4th relay K 4 simultaneously, Systematic selection UV phase winding is as measuring object.When the second normally opened contact of controller the first normally opened contact of closed first relay K 1 and the second relay K 2 simultaneously, Systematic selection UW phase winding is as measuring object.When the 3rd normally opened contact of controller the second normally opened contact of closed second relay K 2 and the 3rd relay K 3 simultaneously, Systematic selection VW phase winding is as measuring object.
Especially, in the present invention one preferred embodiment, still with reference to Fig. 1, above-mentioned automatic measurement system also comprises protection switching device K6.The three-phase windings of tested motor 2 is by the second switching device KM2, winding change-over switch 6 and protection switching device K6 contact resistance measurement mechanism 7.Therefore, when automatic measurement system breaks down (such as excess current or superpotential), controller can disconnect protection switching device K6 in time, with available protecting electric resistance measuring apparatus 7.Here, switching device K6 is protected preferably to be controlled by the normally opened contact of the relay of controller.Especially; protection switching device K6 or the second switching device KM2 can also have Non-follow control function; when testing crew finds that automatic measurement system breaks down; such as testing crew finds should the motor of stall when still having rotating speed; in order to the safety of electric resistance measuring apparatus 7; now testing crew manually disconnects protection switching device K6 or the second switching device KM2 in time, thus ensures artificially to control the failed situation of shutdown.
Correspondingly, the embodiment of the present invention additionally provides the method for work of above-mentioned automatic measurement system.Fig. 3 shows a kind of schematic flow sheet of the method for work of the automatic measurement system of embodiment of the present invention motor hot resistance.The braking method of the obstructed electric current of the corresponding tested motor 2 of the method for work that the present embodiment relates to.As shown in Figure 3, the method for work of the automatic measurement system described in the present embodiment, mainly comprises the following steps:
Step 101: controller closes the first switching device KM1 and the 3rd switching device KM3, and examination motor 1 and tested motor 2 are accompanied in operation.
Step 102: controller judges whether tested motor 2 meets the thermal stable condition preset.
Particularly, first controller controls to accompany examination motor 1 and tested motor 2 to run, and by adjustment first current transformer 4 and the second current transformer 5, makes tested motor 2 meet the thermal stable condition preset as early as possible.Judge whether motor meets the thermal stable condition preset to coordinate, need heating position (casing or winding) the place set temperature pick-up unit at motor, by the signal that temperature-detecting device feeds back, controller automatically calculates motor by thermal equilibrium algorithm and whether reaches thermal equilibrium state, if motor reaches thermal equilibrium shape, then determine that motor meets default thermal stable condition.Owing to judging that the method whether motor reaches thermal equilibrium state is the determination methods that those skilled in the art's routine adopts, therefore no longer carry out expansion explanation in this article.
Step 103: when tested motor 2 meets the thermal stable condition preset, controller disconnects the first switching device KM1, starts timing simultaneously, disconnects the first switching device KM1, close ventilation unit and control to accompany examination motor 1 fall-back.
Particularly, for the braking method adopting the obstructed electric current of tested motor 2, get the moment of tested motor 2 main circuit of cut-out (namely disconnecting the first switching device KM1) as " cooling starts " moment, carve at this moment and also need to close ventilation unit and make to accompany examination motor 1 fall-back by control first current transformer 4, start timing with Time Controller.
Step 104: judge whether the time of accompanying the rotating speed of examination motor 1 to be down to zero Time Controller accumulative was less than for first schedule time.
Step 105: when its accumulative time was less than for first schedule time when controller judges to accompany the rotating speed of examination motor 1 to be down to zero, controller is closed second switching device KM2 after second schedule time, and after the 3rd schedule time after closed second switching device KM2, the resistance of the winding of tested motor 2 measured by controlling resistance measurement mechanism 7.
Particularly, first schedule time was preferably 2min, and second schedule time was preferably 1s, and the 3rd schedule time was preferably 1s.If the time that controller starts to add up from " cooling starts " moment when accompanying examination motor 1 stall is less than 2min, then controller first closed second switching device KM2 after time delay 1s, to access in automatic measurement system by resistance measuring circuit, after the 1s of closed second switching device KM2, then start the resistance of the winding measuring tested motor 2 in conjunction with winding change-over switch 6 controlling resistance measurement mechanism 7.
Here, first schedule time was preferably 2min, be intended to the requirement meeting the standards such as IEC60349-2 and IEC60349-4: stop, its resistance can not can not start the large-size machine measured in the 45s that " cooling start " is later in time for some, should consult between user and manufacturer to adopt special braking scheme and extend the time starting to measure, but must start to measure within " cooling starts " 2min.
Brief description is based on the defining method of the electric machine temperature rise of the method described in the present embodiment below: first, the automatic measurement system shown in Fig. 1 is utilized to measure the cold-state resistance of motor, namely controller disconnects the first switching device KM1 and draws three switching devices, only closed second switching device KM2 and the 4th switching device K5, regulates winding change-over switch 6 to measure the resistance of the resistance of UV phase winding, the resistance of UW phase winding and the VW phase winding of tested motor 2 under cold conditions (the off-duty state of tested motor 2) respectively.Secondly, the method described in the present embodiment is utilized to obtain the hot resistance of discrete value extrapolated " cooling starts " the moment motor of motor hot resistance.Finally, according to formula Δ t=(R
2-R
1) (X+t
1)/R
1-(t
2-t
1) calculate electric machine temperature rise.
Another kind method is, after utilizing the method described in the present embodiment to obtain the discrete value of motor hot resistance, utilizes the computing formula of above-mentioned electric machine temperature rise to calculate electric machine temperature rise discrete value corresponding to various discrete value respectively.Finally utilize the temperature rise of electric machine temperature rise discrete value extrapolated " cooling starts " moment motor.The method of Data Extrapolation method and data fitting, particularly, is depicted as the function curve of time by the discrete value of electric machine temperature rise, wherein temperature rise coordinate adopts logarithmically calibrated scale, and time coordinate adopts linear scale.Then by drawn curve extrapolation to moment of " cooling start ", to obtain the electric machine temperature rise in " cooling starts " moment.
Therefore, the method for application described in the present embodiment, under the mode of braking adopting the obstructed electric current of tested motor 2, accurately can measure the hot resistance of tested motor 2, thus for accurately determining that the electric machine temperature rise in " cooling starts " moment is laid a good foundation.The method of application described in the present embodiment, decreases the labour intensity of experimenter, has saved human cost, added experimental safe, and improve measuring accuracy.
Fig. 4 shows the another kind of schematic flow sheet of the method for work of the automatic measurement system of embodiment of the present invention motor hot resistance.The alive braking method of the corresponding tested motor 2 of the method for work that the present embodiment relates to.As shown in Figure 4, the method for work of the automatic measurement system described in the present embodiment, mainly comprises the following steps:
Step 201: controller closes the first switching device KM1 and the 3rd switching device KM3, and examination motor 1 and tested motor 2 are accompanied in operation.
Step 202: controller judges whether tested motor 2 meets the thermal stable condition preset.
Step 203: when tested motor 2 meets the thermal stable condition preset, controller disconnects the 3rd switching device KM3 and controls the drive current that the second current transformer 5 reduces tested motor 2 gradually, and when the drive current of tested motor 2 drops to 80% of predetermined current, close ventilation unit and start timing.
Step 204: judge whether the time that the rotating speed of tested motor 2 is down to zero Time Controller accumulative was less than for first schedule time.
Step 205: when the rotating speed of tested motor 2 reduce to zero Time Controller judge that accumulative timing was less than for first schedule time time, controller is closed second switching device KM2 after second schedule time, and after the 3rd schedule time after closed second switching device KM2, the resistance of the winding of tested motor 2 measured by controlling resistance measurement mechanism 7.
The alive braking method of the corresponding tested motor 2 of the method for work that the present embodiment relates to, contrasts the braking method of the obstructed electric current of the tested motor of a upper embodiment 2, and the difference of the method for the present embodiment is only the determination mode in " cooling starts " moment.
Particularly, in the present embodiment, the drive current of tested motor 2 is dropped to the moment of 80% of predetermined current as " cooling starts " moment, be intended to the requirement meeting the standards such as IEC60349-2 and IEC60349-4: the preferential braking method adopting the obstructed electric current of tested motor 2, in this case, the moment of cutting off motor main circuit before getting braking, as " cooling starts " moment, excises all separate ventilations instantaneously at this.If can not adopt above-mentioned braking method, then can adopt the braking method of tested motor 2 belt current, as long as the method taked can make the rapid stall of motor, and load current can keep reasonably constant during braking." cooling starts " moment should be the moment that load current drops to 80% trial value electric current, carves at this moment, should excise ventilation.
Based on the defining method of the electric machine temperature rise of the method described in the present embodiment and a upper embodiment similar, therefore no longer carry out expansion explanation at this.
Therefore, the method for application described in the present embodiment, under the alive mode of braking of the tested motor 2 of employing, accurately can measure the hot resistance of tested motor 2, thus for accurately determining that the electric machine temperature rise in " cooling starts " moment is laid a good foundation.The method of application described in the present embodiment, decreases the labour intensity of experimenter, has saved human cost, added experimental safe, and improve measuring accuracy.
Set forth the preferred embodiment of above-mentioned two embodiments of the method below:
In the present invention one preferred embodiment, the resistance of a certain phase winding of tested motor 2 only measured by controller, and according to the resistance determination electric machine temperature rise of this phase winding.In such cases, winding change-over switch 6 is adjusted to designated state by controller, with the resistance making electric resistance measuring apparatus 7 measure the appointment phase winding of tested motor 2 according to predetermined interval.Such as, the resistance of the UV phase winding of tested motor 2 only measured by controller, this Time Controller is closed first normally opened contact of the first relay K 1 and the 4th normally opened contact of the 4th relay K 4 simultaneously, Systematic selection UV phase winding is as the measuring object of specifying, and then the resistance of UV phase winding measured by controller according to predetermined interval.
In the present invention one preferred embodiment, controller needs the resistance of the resistance of the UV phase winding measuring tested motor 2, the resistance of UW phase winding and VW phase winding, and according to the resistance determination electric machine temperature rise of this three-phase windings.In such cases, controller regulates the state of winding change-over switch 6 according to predetermined interval, to circulate the resistance of the three-phase windings measuring tested motor 2 to make electric resistance measuring apparatus 7.Namely controller just switches the state of a winding change-over switch 6 every predetermined interval, the resistance of the resistance of UV phase winding, the resistance of UW phase winding and the VW phase winding of measuring tested motor 2 to circulate.
In the present invention one preferred embodiment, when judging that electric resistance measuring apparatus 7 is in idle condition, controller disconnects the 4th switching device K5, until when judging that electric resistance measuring apparatus 7 is in running order, and closed 4th switching device K5.It is pointed out that idle condition i.e. this device of electric resistance measuring apparatus 7 does not carry out the state of resistance measurement work, duty i.e. this device is carrying out the state of resistance measurement work.In specific implementation process, according to above-mentioned predetermined interval, controller can accurately judge that electric resistance measuring apparatus 7 is in idle condition or in running order.
In the present embodiment, can periodically opening and closing to measure discrete value, long-time power supply can be avoided to have impact to winding resistance to the 4th switching device K5 (also can be the second switching device KM2).Certainly, select less if measure electric current, closedown also can be kept always to carry out continuous coverage.The present embodiment is intended to the requirement meeting the standards such as IEC60349-2 and IEC60349-4: if adopt V.A. method to measure, for obtaining required accuracy, enough large electric current should be taken fully, and this current value itself can not affect temperature rise (generally, this value be no more than 10% of rated current just can meet this require).
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 following requirement as much as possible:
When 1, measuring initial cold-state resistance and hot resistance, same measuring method should be adopted to read all readings on given winding;
2, during off-test, motor stalling should be made within the time short as far as possible;
3, earlier than starting the resistance value surveying each winding in 45s after " cooling start " moment, and should should continue at least 5min, the time interval that each winding is successively measured, being no more than 20s initial 3min planted agent, is after this 30s.
Although embodiment disclosed in this invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from spirit and scope disclosed in this invention; any amendment and change can be done what implement in form and in details; but protection scope of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (9)
1. the automatic measurement system of a motor hot resistance, it is characterized in that, comprise and accompany examination motor, torque gauge, controller and be all controlled by the first current transformer of described controller, the second current transformer, the first switching device, the second switching device, the 3rd switching device, the 4th switching device, winding change-over switch, electric resistance measuring apparatus and the ventilation unit for the three-phase windings that cools tested motor;
The described output shaft of examination motor of accompanying is connected with a joggle by the output shaft of described torque gauge and described tested motor;
The described three-phase windings of examination motor of accompanying is by described 3rd switching device and described first current transformer joint test power supply;
The three-phase windings of described tested motor is connected described experiment power supply by described first switching device with described second current transformer; The three-phase windings of described tested motor is also connected described electric resistance measuring apparatus by described second switching device with described winding change-over switch; Described electric resistance measuring apparatus connects power supply by described 4th switching device.
2. the automatic measurement system of motor hot resistance according to claim 1, is characterized in that, described winding change-over switch comprises the first relay, the second relay, the 3rd relay and the 4th relay that are all controlled by described controller;
The U phase winding of described tested motor is connected described electric resistance measuring apparatus by described second switching device with the first normally opened contact of described first relay;
The W phase winding of described tested motor is connected described electric resistance measuring apparatus by described second switching device with the second normally opened contact of described second relay;
One end for connecting described electric resistance measuring apparatus being connected described second normally opened contact for one end of connecting described electric resistance measuring apparatus by the 3rd normally opened contact of described 3rd relay with the 4th normally opened contact of described 4th relay of described first normally opened contact; The V phase winding of one end by the described tested motor of described second switching device connection for connecting described 4th normally opened contact of described 3rd normally opened contact.
3. the automatic measurement system of motor hot resistance according to claim 1 and 2; it is characterized in that; also comprise protection switching device, the three-phase windings of described tested motor is connected described electric resistance measuring apparatus by described second switching device, described winding change-over switch with described protection switching device.
4. a method of work for the automatic measurement system of motor hot resistance, is characterized in that, described automatic measurement system is the automatic measurement system of motor hot resistance as claimed any one in claims 1 to 3, and described method comprises:
Described controller closes described first switching device and described 3rd switching device, and accompanies examination motor and described tested motor described in running;
When described tested motor meets default thermal stable condition, described controller disconnects described first switching device, starts timing simultaneously, closes described ventilation unit and accompanies examination motor reduction to run described in control;
When described accompany the rotating speed of examination motor to reduce to zero time described controller judge whether accumulative timing was less than for first schedule time; If so, then described controller closed described second switching device after second schedule time, and control the resistance that described electric resistance measuring apparatus measures the winding of described tested motor after the 3rd schedule time after closed second switching device.
5. method according to claim 4, is characterized in that, described controller controls the resistance that described electric resistance measuring apparatus measures the winding of described tested motor, comprising:
Described winding change-over switch is adjusted to designated state by described controller, to make described electric resistance measuring apparatus according to the resistance of the appointment phase winding of the described tested motor of predetermined interval measurement; Or
Described controller regulates the state of described winding change-over switch according to predetermined interval, with the resistance making the circulation of described electric resistance measuring apparatus measure the three-phase windings of described tested motor.
6. method according to claim 5, is characterized in that, also comprises:
When judging that described electric resistance measuring apparatus is in idle condition, described controller disconnects described 4th switching device, until when judging that described electric resistance measuring apparatus is in running order, and closed described 4th switching device.
7. a method of work for the automatic measurement system of motor hot resistance, is characterized in that, described automatic measurement system is the automatic measurement system of motor hot resistance as claimed any one in claims 1 to 3, and described method comprises:
Described controller closes described first switching device and described 3rd switching device, and accompanies examination motor and described tested motor described in running;
When described tested motor meets default thermal stable condition, described controller disconnects described 3rd switching device and controls the drive current that described second current transformer reduces described tested motor gradually, and when the drive current of described tested motor drops to 80% of predetermined current, close described ventilation unit and start timing;
When the rotating speed of described tested motor reduces to zero, described controller judges whether accumulative timing was less than for first schedule time; If so, then described controller closed described second switching device after second schedule time, and control the resistance that described electric resistance measuring apparatus measures the winding of described tested motor after the 3rd schedule time after closed second switching device.
8. method according to claim 7, is characterized in that, described controller controls the resistance that described electric resistance measuring apparatus measures the winding of described tested motor, comprising:
Described winding change-over switch is adjusted to designated state by described controller, to make described electric resistance measuring apparatus according to the resistance of the appointment phase winding of the described tested motor of predetermined interval measurement; Or
Described controller regulates the state of described winding change-over switch according to predetermined interval, with the resistance making the circulation of described electric resistance measuring apparatus measure the three-phase windings of described tested motor.
9. method according to claim 8, is characterized in that, also comprises:
When judging that described electric resistance measuring apparatus is in idle condition, described controller disconnects described 4th switching device, until when judging that described electric resistance measuring apparatus is in running order, and closed described 4th switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239359.9A CN104865443B (en) | 2015-05-12 | 2015-05-12 | The automatic measurement system and its method of work of motor hot resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510239359.9A CN104865443B (en) | 2015-05-12 | 2015-05-12 | The automatic measurement system and its method of work of motor hot resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104865443A true CN104865443A (en) | 2015-08-26 |
| CN104865443B CN104865443B (en) | 2017-12-26 |
Family
ID=53911414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510239359.9A Active CN104865443B (en) | 2015-05-12 | 2015-05-12 | The automatic measurement system and its method of work of motor hot resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104865443B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988052A (en) * | 2015-10-23 | 2016-10-05 | 安徽中认倍佳科技有限公司 | Household electric appliance motor winding temperature rise on-machine 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 |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205531U (en) * | 1985-12-24 | 1987-01-14 | 清华大学 | Automatic winding temperature rise-measuring unit with microcomputer for electric motor |
| JP2008058073A (en) * | 2006-08-30 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Resistance value measuring method for electronic component and its device |
| CN201177649Y (en) * | 2007-12-29 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | Automatic test equipment for temperature rising of winding |
| CN102590747A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Test system of temperature rise of motor winding and test method of the test system |
| US20130207736A1 (en) * | 2012-02-14 | 2013-08-15 | SK Hynix Inc. | Resistance measuring circuit, resistance measuring method, and impedance control circuit |
| CN103267949A (en) * | 2013-05-30 | 2013-08-28 | 天津出入境检验检疫局工业产品安全技术中心 | Motor type test testing system |
| CN103630838A (en) * | 2013-12-17 | 2014-03-12 | 南车株洲电机有限公司 | Twin-towing temperature rise method and device for doubly-fed generators |
| CN103954872A (en) * | 2014-05-20 | 2014-07-30 | 中华人民共和国东莞出入境检验检疫局 | Transformer temperature rise measuring device and method |
| CN104062586A (en) * | 2014-07-03 | 2014-09-24 | 广州电力机车有限公司 | Method employing test bench to check driving motor |
| CN104198086A (en) * | 2014-08-22 | 2014-12-10 | 美的集团股份有限公司 | Winding temperature rise test method and device |
| CN204028321U (en) * | 2014-06-12 | 2014-12-17 | 珠海格力电器股份有限公司 | Motor detection apparatus |
-
2015
- 2015-05-12 CN CN201510239359.9A patent/CN104865443B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205531U (en) * | 1985-12-24 | 1987-01-14 | 清华大学 | Automatic winding temperature rise-measuring unit with microcomputer for electric motor |
| JP2008058073A (en) * | 2006-08-30 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Resistance value measuring method for electronic component and its device |
| CN201177649Y (en) * | 2007-12-29 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | Automatic test equipment for temperature rising of winding |
| US20130207736A1 (en) * | 2012-02-14 | 2013-08-15 | SK Hynix Inc. | Resistance measuring circuit, resistance measuring method, and impedance control circuit |
| CN102590747A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Test system of temperature rise of motor winding and test method of the test system |
| CN103267949A (en) * | 2013-05-30 | 2013-08-28 | 天津出入境检验检疫局工业产品安全技术中心 | Motor type test testing system |
| CN103630838A (en) * | 2013-12-17 | 2014-03-12 | 南车株洲电机有限公司 | Twin-towing temperature rise method and device for doubly-fed generators |
| CN103954872A (en) * | 2014-05-20 | 2014-07-30 | 中华人民共和国东莞出入境检验检疫局 | Transformer temperature rise measuring device and method |
| CN204028321U (en) * | 2014-06-12 | 2014-12-17 | 珠海格力电器股份有限公司 | Motor detection apparatus |
| CN104062586A (en) * | 2014-07-03 | 2014-09-24 | 广州电力机车有限公司 | Method employing test bench to check driving motor |
| CN104198086A (en) * | 2014-08-22 | 2014-12-10 | 美的集团股份有限公司 | Winding temperature rise test method and device |
Non-Patent Citations (2)
| Title |
|---|
| 姚向华等: "交流电机定子绕组温升在线带电自动测试", 《计算机自动测量与控制》 * |
| 王显春: "一种交流电机定子绕组温升在线测量电路", 《抚顺石油学院学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105988052A (en) * | 2015-10-23 | 2016-10-05 | 安徽中认倍佳科技有限公司 | Household electric appliance motor winding temperature rise on-machine test device and method |
| 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 |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104865443B (en) | 2017-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107154771B (en) | Fan frequency control system for converters | |
| CN104865443A (en) | Automatic measurement system of motor hot resistance and work method thereof | |
| CN101458309B (en) | Rapid warm raising measurement set for electric automobile motor drive system and measurement method | |
| CN201110888Y (en) | Self-starting rare-earth permanent magnet rotor type electric motor microcomputer integrated test apparatus | |
| KR20040029306A (en) | Apparatus and method for detecting and calculating ground fault resistance | |
| CN102590747B (en) | Test system of temperature rise of motor winding and test method of the test system | |
| CN109781322B (en) | Method for testing efficiency of driving system of new energy automobile | |
| JP2005521374A (en) | Method and apparatus for determining rotor temperature in a PM synchronous machine | |
| CN108131247B (en) | Data processing method and device for wind generating set | |
| CN104377911A (en) | Humidity removing method, device and system of wind driven generator | |
| CN204666719U (en) | A kind of device for testing power for Wind Turbine Electric Pitch System system | |
| JP2013533726A (en) | Power generation equipment calibration controller | |
| CN111103538A (en) | Automatic test system for temperature rise of three-phase asynchronous alternating current motor winding | |
| CN104454611A (en) | Rail transit vehicle, and brake resistor blower control system thereof and method | |
| CN109240195A (en) | Oil immersed type converter transformer cooling system control method and control system | |
| CN104979834A (en) | Power grid wide area voltage control method, power grid wide area voltage control system and power grid wide area voltage control equipment | |
| JP2013532938A (en) | Power generation equipment calibration controller | |
| CN205352708U (en) | Insert electric formula hybrid vehicle's power assembly test rack | |
| CN105004995B (en) | Nuclear power station main pump Motor-Testing System and its test method | |
| CN210665915U (en) | High-current generation system of high-voltage switch equipment | |
| CN212301809U (en) | Alternating current power supply test bed | |
| CN202563072U (en) | Temperature rise test system for motor winding | |
| CN113009191A (en) | New energy automobile PMSM test bench | |
| CN111624486A (en) | Online insulation detection method and device for generator of doubly-fed wind turbine generator | |
| KR200461697Y1 (en) | Automatic Motor Drying Apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee after: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. Address before: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee before: ZHUZH CSR TIMES ELECTRIC Co.,Ltd. |