CN107957332A - A kind of used in new energy vehicles synchronous driving motor acceleration service life test method and device - Google Patents
A kind of used in new energy vehicles synchronous driving motor acceleration service life test method and device Download PDFInfo
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- CN107957332A CN107957332A CN201610898656.9A CN201610898656A CN107957332A CN 107957332 A CN107957332 A CN 107957332A CN 201610898656 A CN201610898656 A CN 201610898656A CN 107957332 A CN107957332 A CN 107957332A
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Abstract
The invention discloses a kind of used in new energy vehicles synchronous driving motor acceleration service life test method and device, this method calculates the time actual life T of motor firstc；Then choosing influences the factor of electrical machinery life, gives the stress value of factor, with reference to the stress value and correlation formula of factor, calculates the size of accelerated factor, accelerated aging time T is calculated according to the size of accelerated factor and time actual lifea；Finally by motor continuous firing within the accelerated aging time, the stress value of factor is loaded, accelerated life test is carried out to motor.Since accelerated aging selection of time and operating mode, operating mode do not determine relation, but the method for the present invention makes the selection confidence level of test period very high, and the present invention can effectively shorten test period, reduce the experimentation cost of input.
Description
Technical field
The invention belongs to vehicle traction motor test field, more particularly to a kind of used in new energy vehicles accelerated aging synchronously drives
Motor test method and device.
Background technology
Kernel component of the motor driven systems as electric automobile, its reliability level largely determine whole
The reliability level of car.With the development of science and technology and people's awareness of safety intensification, requirement of the user to electric system
Standard is higher and higher, and reliability is increasingly taken seriously.
The projected life of automobile motor drive system reaches hundreds of thousands kilometer, its life test examination difficulty is big, for car
There is no special equipment also with the life test of motor driven systems, common electrical machinery life testing method there are two kinds, one kind
It is conventional life test method, another kind is accelerated life test.Conventional life test is the true actual operation according to vehicle
Operating mode carries out complete simulation test, as a result there is a higher accuracy, but test period it is longer, it is necessary to expend substantial amounts of manpower,
Financial resources and material resources, have a great impact for motor research and development and batch process, are accelerated life tests used by general therefore
Method evaluates electrical machinery life.
Accelerated life test is on the premise of sample fails mechanism is not changed, and promotes sample using the method for increasing stress
Fail in a short time, to predict the reliability of sample and service life in normal working conditions；GB/T18488.2-2015 is defined
The reliability test method of motor, i.e., under three kinds of different operating voltages, overload sample motor band, nominal load and specified
Feedback load persistent loop runs 402h, and then result is estimated and evaluated；But this test method is asked there are several
Topic, is the working time first, the type of drive of new energy vehicle has series, parallel and series-parallel connection and pure electric vehicle, and type of drive is not
Together, motor operating point is different, and vehicle traveling road conditions are different, and the formulation of working time just has its uncertainty；Secondly Working mould
Formula, operating point selected by the motor and working condition of motor comes in and goes out very big, the output energy of different motors during vehicle actual travel
Power is also different, it is impossible to which general evaluates according to same operating mode；It is acceleration problem again, selects the acceleration of 402h
Experiment, accelerated factor mutually disconnect with the actual operation operating mode of vehicle, are only realized by increasing the rotating speed of certain multiple, accelerated factor
Selection there is no preferable accuracy, and the selection confidence level of test period is poor.
The content of the invention
It is an object of the invention to provide a kind of used in new energy vehicles synchronous driving motor acceleration service life test method and device,
Relation is not determined for solving accelerated aging selection of time and operating mode, operating mode, and test period selection confidence level difference is asked
Topic.
To achieve the above object, the technical scheme is that：
A kind of used in new energy vehicles synchronous driving motor acceleration service life test method, method scheme one, comprises the following steps：
1) the time actual life T of motor is calculatedc；
2) choosing influences the factor of electrical machinery life, gives the stress value of factor, with reference to the stress value and correlation formula of factor,
The size of accelerated factor is calculated, accelerated aging time T is calculated according to the size of accelerated factor and time actual lifea；
3) by motor continuous firing within the accelerated aging time, the stress value of factor is loaded, accelerated aging is carried out to motor
Experiment.
Method scheme two, on the basis of method scheme one, the factor of selection is winding temperature, the stress value of winding temperature
For T11, T11Temperature for the machine winding set under accelerated test, correlation formula are：
The accelerated aging time is：
Wherein, KT1For the corresponding accelerated factor of winding temperature；B is the coefficient related with insulation, and consulting literatures understand motor
Insulation H-stage coefficient value is 15500；T01For the mean temperature of machine winding；TaFor the accelerated aging time；TcTime actual life.
Method scheme three, on the basis of method scheme one, the factor of selection is bearing temperature, the stress value of bearing temperature
For T12, T12Temperature for the motor bearings set under accelerated test, correlation formula are：
The accelerated aging time is：
Wherein, KT2For the corresponding accelerated factor of winding temperature；T02For the mean temperature of bearing；ε is life characteristics, ball axis
Hold as 3, roller bearing 10/3；TaFor the accelerated aging time；TcTime actual life.
Method scheme four, on the basis of method scheme one, the factor of selection is mechanical stress, and correlation formula is：
The accelerated aging time is：
Wherein, K3For the accelerated factor of mechanical stress；N is motor speed, can use maximum (top) speed；C is specified for motor bearings
Load；P bears rated load for motor is actual, can use load corresponding to motor maximum torque；fpFor load factor, take 1.2~
1.8；TaFor the accelerated aging time；TcTime actual life.
Method scheme five, on the basis of method scheme one, time actual life is expressed as：
Wherein, r is tire radius；N is driving motor actual speed, and corresponding motor turns under rounding car average speed per hour here
Fast nP；δ is car retarder speed reducing ratio；S is vehicle quality guarantee period (life cycle) interior total travel distance；TCFor time actual life.
Method scheme six, on the basis of method scheme one, the accelerated life test carries out under nominal torque first,
Then carry out under peak torque, then carried out under specified feedback torque, finally carried out under rated power/peak speed,
Accelerated aging time TaIt is interior constantly to repeat aforementioned four process.
Method scheme seven, on the basis of method scheme one, occur during experiment stator failure and rotor fault or
Stop experiment when coordinating failure, bearing is replaced when there is failure on axis and continues to test, the more ventilating fan when there is cooling failure
Continue to test, continue to test when there is shell when unit failure.
Method scheme eight, on the basis of method scheme seven, the stator failure include stator core failure, stator around
Group failure, rotor fault include rotor core failure, permanent magnet failure, and failure includes bearing fault, shaft failure on axis, other
Failure includes coordinating the unit failures such as failure, cooling failure, shell.
Present invention also offers a kind of used in new energy vehicles synchronous driving motor accelerated life test device, device scheme one,
Including with lower module：
Computing module：Calculate the time actual life T of motorc；
Choose module：Choosing influences the factor of electrical machinery life, the stress value of factor is given, with reference to the stress value and phase of factor
Formula is closed, calculates the size of accelerated factor, accelerated aging time T is calculated according to the size of accelerated factor and time actual lifea；
Tentative module：For within the accelerated aging time, motor continuous firing to be loaded the stress value of factor, to motor into
Row accelerated life test.
Device scheme two, on the basis of device scheme one, the factor of selection is winding temperature, the stress value of winding temperature
For T11, T11Temperature for the machine winding set under accelerated test, correlation formula are：
The accelerated aging time is：
Wherein, KT1For the corresponding accelerated factor of winding temperature；B is the coefficient related with insulation, and consulting literatures understand motor
Insulation H-stage coefficient value is 15500；T01For the mean temperature of machine winding；T11Temperature for the machine winding set under accelerated test
Degree；TaFor the accelerated aging time；TcTime actual life.
Device scheme three, on the basis of device scheme one, the factor of selection is bearing temperature, the stress value of bearing temperature
For T12, T12Temperature for the motor bearings set under accelerated test, correlation formula are：
The accelerated aging time is：
Wherein, KT2For the corresponding accelerated factor of winding temperature；T02For the mean temperature of bearing；T12Divided into for accelerated test
The temperature of fixed bearing；ε is life characteristics, ball bearing 3, roller bearing 10/3；TaFor the accelerated aging time；TcThe actual longevity
Order the time.
Device scheme four, on the basis of device scheme one, the factor of selection is mechanical stress, and correlation formula is：
The accelerated aging time is：
Wherein, K3For the accelerated factor of mechanical stress；N is motor speed, can use maximum (top) speed；C is specified for motor bearings
Load；P bears rated load for motor is actual, can use load corresponding to motor maximum torque；fpFor load factor, take 1.2~
1.8；TaFor the accelerated aging time；TcTime actual life.
Device scheme five, on the basis of device scheme one, time actual life is expressed as：
Wherein, r is tire radius；N is driving motor actual speed, and corresponding motor turns under rounding car average speed per hour here
Speed；δ is car retarder speed reducing ratio；S is vehicle quality guarantee period (life cycle) interior total travel distance；TCFor time actual life.
Device scheme six, on the basis of device scheme one, the accelerated life test carries out under nominal torque first,
Then carry out under peak torque, then carried out under specified feedback torque, finally carry out, adding under rated power/peak speed
Fast life time TaIt is interior constantly to repeat aforementioned four process.
Device scheme seven, on the basis of device scheme one, occur during experiment stator failure and rotor fault or
Stop experiment when coordinating failure, bearing is replaced when there is failure on axis and continues to test, the more ventilating fan when there is cooling failure
Continue to test, continue to test when there is shell when unit failure.
Device scheme eight, on the basis of device scheme seven, the stator failure include stator core failure, stator around
Group failure, rotor fault include rotor core failure, permanent magnet failure, and failure includes bearing fault, shaft failure on axis, other
Failure includes coordinating the unit failures such as failure, cooling failure, shell.
The beneficial effects of the invention are as follows：
Since accelerated aging selection of time and operating mode, operating mode do not determine relation, but the method for the present invention makes experiment
The selection confidence level of time is very high.The present invention assesses electrical machinery life to be combined with vehicle service life, chooses shadow to be measured
The factor of electrical machinery life is rung, and draws the corresponding accelerated factor of factor, suitable accelerated factor is chosen and calculates the accelerated aging time,
Result of the test is more nearly the true service life of motor, motor is operated under worst working status, so that effectively
Shorten test period, reduce the experimentation cost of input.
Brief description of the drawings
Fig. 1 is motor accelerated life test operating mode schematic diagram；
Fig. 2 is motor acceleration service life test method flow chart.
Embodiment
A kind of embodiment of used in new energy vehicles synchronous driving motor acceleration service life test method of the present invention, it is same using permanent magnetism
Step driving motor, using the temperature of winding as accelerated factor, specifically, as shown in Fig. 2, first by vehicle life cycle
Equivalent mileage converses motor actual life test period, and specific traveling road conditions according to vehicle and motor operating state are rolled over
Accelerated factor is calculated, completes determining for motor accelerated aging time, experiment is then carried to the band for being dragged into row state of cyclic operation by motor,
The failure occurred during experiment is recorded, test specimen is judged and evaluated according to the result of record.
1 actual life test period determines
Different automobile types (plug-in hybrid, pure electric automobile) can be calculated by equivalent mileage conversion formula to drive
Running time of the motor in vehicle life cycle in distance travelled, it is assumed here that vehicle is run under average speed per hour,
So actual speed when motor can be run with rounding car average speed per hour.
The use environment of pure electric vehicle driving motor in vehicle Life cycle with runing, therefore the calculating of actual life
Formula is：
Wherein, r is tire radius, and unit is m (rice)；N is driving motor actual speed, here under rounding car average speed per hour
Corresponding motor speed nP, unit is rpm (rev/min)；δ is car retarder speed reducing ratio；S is vehicle quality guarantee period (life cycle)
Interior total travel distance, unit are km (km)；TCFor time actual life, unit is h (hour).
The current mounting configuration majority vehicle of driving motor of plug-in hybrid is by gearbox or direct-connected is being driven
On axis, it is servo-actuated and is travelled in vehicle, this just determines that the operation road conditions of plug-in driving motor are approximately equal to pure electric vehicle motor, is complete
Life cycle operation, therefore the calculating of time actual life is equal to pure electric vehicle motor, generator (most cars of plug-in hybrid
Be independent generator, the dual motors system of use) use environment is more complicated, and it has intelligent shutdown, idling inflation and feedback
The states such as electricity power generation.Therefore, the operation state of generator is not vehicle Life cycle operation, and use state is decided by vehicle
Battery parameter, control strategy etc..According to a large amount of hybrid electric vehicle data (vehicle running time and generator running time)
Investigation situation, takes actual life coefficient ρ (taking 0.6~0.7), therefore the calculation formula of time actual life is：
Wherein, r is tire radius, and unit is m (rice)；N is driving motor actual speed, here under rounding car average speed per hour
Corresponding motor speed nP, unit is rpm (rev/min)；δ is car retarder speed reducing ratio；S is vehicle quality guarantee period (life cycle)
Interior total travel distance, unit are km (km)；TCFor time actual life, unit is h (hour), and ρ is actual life coefficient, one
As take 0.6~0.7.
2 accelerated factors determine
Accelerated stress mode has stepstress and progressive stress and three kinds of constant stress, chooses constant stress mode here,
Influence electrical machinery life factor mainly have environmental stress, thermal stress and electric stress, due to test-bed used by motor control
Voltage, electric current and the frequency and vehicle virtual condition that device processed provides are essentially identical, so not using electric stress to accelerate.
Three critical pieces for determining the electric system service life are winding, bearing and magnet steel, influence the factor master in magnet steel service life
There are temperature and additional weak magnetic magnetic field, it is generally understood that when temperature is less than Curie temperature.Externally-applied magnetic field is less than permanent-magnet material flex point
When, on the magnet steel service life substantially without influence.Magnet steel also has a weathering rate, but its influence in vehicle life cycle substantially can be with
Ignore.Therefore, if motor is within home, and will not decline without big weak magnetoelectricity stream, magnet steel performance caused by control error
Subtract, i.e. magnet steel failure belongs to stress intensity failure, is not belonging to loss and fatigue failure, therefore zero as electric system of magnet steel
Part assumes to be considered reliable in life test.
Winding and bearing are varied with temperature to its aging effects, according to the related data of existing vehicle,
The mean temperature that vehicle machine winding in normal operation can be measured is T01, set under accelerated test the temperature of machine winding as
T11, can be according to the T for the increase selection that the specific actual characteristic of motor is tried one's best in order to shorten the test period of motor11Value.
The Temperature Accelerating Factor in Life Test of winding is：
Wherein, B is the coefficient related with insulation, and consulting literatures understand that motor insulation H-stage coefficient value is 15500, T01For electricity
The mean temperature of machine winding, T11Temperature for the machine winding set under accelerated test.
3 accelerated aging times determined
The winding of motor or the failure of bearing either component just can determine whether that the motor sample is not met and want during experiment
The vehicle technical indicator asked.Therefore, accelerated factor can be selected according to specific actual conditions, motor is operated in worst work
Under state, so as to effectively shorten test period, the experimentation cost of input is reduced, can also be chosen moderate according to the actual requirements
Accelerated factor, result of the test is more nearly the true service life of motor.Here winding temperature is chosen as accelerated factor, such as
Shown in Fig. 2.
Wherein, TaFor the accelerated aging time, unit is h (hour)；TcFor time actual life, unit is h (hour)；KT1
For the Temperature Accelerating Factor in Life Test of winding.
4 experiment processes
Test specimen is chosen, selected tested motor must is fulfilled for vehicle items technical conditions and performance requirement, required
Testing equipment includes motor to drag platform frame, host computer, programmable water cooling equipment, DC power supply, electric machine controller.Motor is operated in
Nominal torque (rated speed), peak torque (rated speed), specified feedback torque (rated speed), peak speed (specified work(
Torque capacity under rate), single loop work 30min, continuous firing TaHour, during which the failure occurred is recorded,
Specifically, as shown in Figure 1.
The type of vehicle that motor accelerated life test is applied according to motor is tested, and test voltage is Rated motor electricity
Pressure, torque load circulation are carried out according to Fig. 1 and table 1.Amount to running time TaThe method provided according to the present invention determines, separately by electricity
Machine winding is heated to accelerating temperature T with extraneous heating equipment11, the flow and water temperature of motor water cooling system simulate vehicle reality completely
State, shutdown inspection once, to safeguard experiment process, that is, allows to shut down 1 time, makes an inspection tour testing equipment when small per 48h, and
Check fastener, mechanical fastener and pipeline, especially hose, check connecting cable and interface and cooling-liquid level height, it is cold
But system if necessary, supplements coolant with the presence or absence of situations such as water clocks.The shutdown inspection time is no more than 1h.
1 accelerated life test parameter cyclic table of table
Tested motor breaks down and is handled according to 2 mode of table during experiment, judges whether sample meets the longevity
Life requires, and fault level is divided according to QC/T891-2011 standards in table 2,1 grade or 2 grades of failures occurs before experiment does not complete
It all may determine that this sample presentation motor does not meet integeral vehicle life requirement；If there is bearing fault i.e. 3 grade failure during experiment,
Bearing is replaced to continue to test；If there are 4 in table 2 grades of failures to continue to test；, can be according to experiment depot when there are other failures
The demand of specific reliability, determines whether to reach qualified with reference to the mean time between failures working time (MTBF) of GB/T29307
Standard.
2 electrical fault evaluation result point of table examines table
Maintenance to motor testing process in the present invention take 48 it is small when test mode, as other embodiment,
Catastrophic failure inspection and each hour mode checked can also be taken.Catastrophic failure inspection, that is, utilize monitoring device and calculating
Machine etc. monitors operation data at any time, more than limits, sends alarm or stops in emergency, according to fault severity level, is located
Reason.Record scram time, reason and disposition.It is every 1 it is small when check, i.e., the interior in due course record motor output when 1 is small
Torque and rotating speed, the DC bus-bar voltage and electric current of electric machine controller input, motor surface temperature, and the temperature of coolant
And flow, if motor is provided with thermally sensitive temperature sensor, the operating temperature of machine winding is checked in the lump.
In above-described embodiment, motor is handled when breaking down in the way of table 2, as other embodiment,
The emphasis of motor difference parts, and producer's quality assurance needs can be directed to, looser appraisement system are taken, to make again
Determine fault handling method.
Above-described embodiment using winding temperature be used as accelerated factor, as other embodiment can also using other because
Element, for example, using the temperature of bearing as the factor for influencing electrical machinery life, can be according to motor in order to shorten the test period of motor
The T that the increase that specific actual characteristic is tried one's best is chosen12Value, calculates its accelerated factor, the size of accelerated factor is：
Wherein, T02For the mean temperature of bearing；T12Temperature for the bearing set under accelerated test；ε is life characteristics,
Ball bearing is 3, roller bearing 10/3.
Accelerated aging time T is calculated using accelerated factora=Tc/KT2, motor bearings is heated to extraneous heating equipment
Accelerate temperature T12, run TaThe time of hour, the failure occurred is recorded, judge whether sample meets that the service life will
Ask.
As other embodiment, using the mechanical stress of motor as the factor for influencing electrical machinery life, calculate its accelerate because
Son, the size of accelerated factor are：
Wherein, n is motor speed, can use maximum (top) speed, unit is rpm (rev/min)；C is motor bearings rated load, single
Position is N (newton)；P bears rated load for motor is actual, can use load corresponding to motor maximum torque, unit is N (newton)；
fpFor load factor, 1.2~1.8 are can use.
Accelerated aging time T is calculated using accelerated factora=Tc/K3, run TaThe time of hour, to the failure occurred
Recorded, judge whether sample meets life requirements.
As other embodiment, winding temperature accelerated factor, bearing temperature accelerated factor, electromechanics can also be chosen
Maximum in stress accelerated factor is as accelerated factor, its accelerated aging time：
Wherein, TaFor the accelerated aging time, unit is h (hour)；TcFor time actual life, unit is h (hour)；KT1
For the Temperature Accelerating Factor in Life Test of winding；KT2For the Temperature Accelerating Factor in Life Test of bearing；K3Turn for the mechanical stress of motor and the reality of motor
The accelerated factor of speed.
Present invention also offers present invention also offers a kind of Vehicular synchronous driving motor accelerated life test device, the dress
Put including computing module, choose module, tentative module.Wherein computing module is used for time actual life for calculating motor；Choose
Module is used to choose the factor for influencing electrical machinery life, gives the stress value of factor, with reference to factor stress value and correlation formula, calculates
The size of accelerated factor, the accelerated aging time is calculated according to the size of accelerated factor and time actual life；Tentative module is used for
By motor continuous firing within the accelerated aging time, factor stress value is loaded, accelerated life test is carried out to motor, and record examination
The failure occurred in during testing, judges the service life of motor.
Above-mentioned experimental rig, is actually a kind of software architecture, each unit therein is corresponding with above-mentioned test method
Process or program.Therefore, no longer the experimental rig is described in detail.
Above-mentioned experimental rig runs in new energy vehicle synchronous driving motor as a kind of program, electrical machinery life is commented
Estimate and combine with vehicle service life, choose the factor of influence electrical machinery life to be measured, and draw the corresponding acceleration of factor because
Son, chooses suitable accelerated factor and calculates the accelerated aging time, result of the test is more nearly the true service life of motor, make electricity
Machine is operated under worst working status, so as to effectively shorten test period, reduces the experimentation cost of input.
Claims (10)
1. a kind of used in new energy vehicles synchronous driving motor acceleration service life test method, it is characterised in that this method includes following step
Suddenly：
1) the time actual life T of motor is calculatedc；
2) choosing influences the factor of electrical machinery life, gives the stress value of factor, with reference to the stress value and correlation formula of factor, calculates
The size of accelerated factor, accelerated aging time T is calculated according to the size of accelerated factor and time actual lifea；
3) by motor continuous firing within the accelerated aging time, the stress value of factor is loaded, accelerated life test is carried out to motor.
2. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 1, it is characterised in that choosing
The factor taken is winding temperature, and the stress value of winding temperature is T11, T11Temperature for the machine winding set under accelerated test,
Correlation formula is：
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Wherein, KT1For the corresponding accelerated factor of winding temperature；B is the coefficient related with insulation, and consulting literatures understand motor insulation H
Level coefficient value is 15500；T01For the mean temperature of machine winding；TaFor the accelerated aging time；TcTime actual life.
3. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 1, it is characterised in that choosing
The factor taken is bearing temperature, and the stress value of bearing temperature is T12, T12Temperature for the motor bearings set under accelerated test,
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Wherein, KT2For the corresponding accelerated factor of winding temperature；T02For the mean temperature of bearing；ε is life characteristics, ball bearing 3,
Roller bearing is 10/3；TaFor the accelerated aging time；TcTime actual life.
4. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 1, it is characterised in that choosing
The factor taken is mechanical stress, and correlation formula is：
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Wherein, K3For the accelerated factor of mechanical stress；N is motor speed, can use maximum (top) speed；C is motor bearings rated load；P
Rated load is born for motor is actual, can use load corresponding to motor maximum torque；fpFor load factor, 1.2~1.8 are taken；TaFor
The accelerated aging time；TcTime actual life.
5. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 1, it is characterised in that institute
State accelerated life test to carry out under nominal torque first, then carried out under peak torque, then under specified feedback torque into
OK, finally carried out under rated power/peak speed, in accelerated aging time TaIt is interior constantly to repeat aforementioned four process.
6. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 1, it is characterised in that
Occur stator failure and rotor fault during experiment or stop experiment when coordinating failure, bearing is replaced when there is failure on axis
Continue to test, when there is cooling failure, more ventilating fan continues to test, and continues to test when there is shell when unit failure.
7. used in new energy vehicles synchronous driving motor acceleration service life test method according to claim 6, it is characterised in that institute
The stator failure stated includes stator core failure, stator winding faults, and rotor fault includes rotor core failure, permanent magnet event
Hinder, failure includes bearing fault, shaft failure on axis, other failures include coordinating the event of the components such as failure, cooling failure, shell
Barrier.
8. a kind of used in new energy vehicles synchronous driving motor accelerated life test device, it is characterised in that the device includes：
Computing module：Calculate the time actual life T of motorc；
Choose module：Choosing influences the factor of electrical machinery life, gives the stress value of factor, and the stress value and correlation with reference to factor are public
Formula, calculates the size of accelerated factor, and accelerated aging time T is calculated according to the size of accelerated factor and time actual lifea；
Tentative module：For within the accelerated aging time, loading the stress value of factor, motor being added motor continuous firing
Fast life test.
9. used in new energy vehicles synchronous driving motor accelerated life test device according to claim 8, it is characterised in that choosing
The factor taken is winding temperature, and the stress value of winding temperature is T11, T11Temperature for the machine winding set under accelerated test,
Correlation formula is：
<mrow>
<msub>
<mi>K</mi>
<mrow>
<mi>T</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>B</mi>
<mrow>
<mo>(</mo>
<mrow>
<mfrac>
<mn>1</mn>
<msub>
<mi>T</mi>
<mn>01</mn>
</msub>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<msub>
<mi>T</mi>
<mn>11</mn>
</msub>
</mfrac>
</mrow>
<mo>)</mo>
</mrow>
</mrow>
</msup>
</mrow>
The accelerated aging time is：
<mrow>
<msub>
<mi>T</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>T</mi>
<mi>c</mi>
</msub>
<msub>
<mi>K</mi>
<mrow>
<mi>T</mi>
<mn>1</mn>
</mrow>
</msub>
</mfrac>
</mrow>
Wherein, KT1For the corresponding accelerated factor of winding temperature；B is the coefficient related with insulation, and consulting literatures understand motor insulation H
Level coefficient value is 15500；T01For the mean temperature of machine winding；T11Temperature for the machine winding set under accelerated test；Ta
For the accelerated aging time；TcTime actual life.
10. used in new energy vehicles synchronous driving motor accelerated life test device according to claim 8, it is characterised in that
The factor of selection is bearing temperature, and the stress value of bearing temperature is T12, T12Temperature for the motor bearings set under accelerated test
Degree, correlation formula are：
<mrow>
<msub>
<mi>K</mi>
<mrow>
<mi>T</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>=</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mo>-</mo>
<mn>0.002</mn>
<msub>
<mi>T</mi>
<mn>12</mn>
</msub>
<mo>+</mo>
<mn>1.2</mn>
</mrow>
<mrow>
<mo>-</mo>
<mn>0.002</mn>
<msub>
<mi>T</mi>
<mn>02</mn>
</msub>
<mo>+</mo>
<mn>1.2</mn>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mi>&epsiv;</mi>
</msup>
</mrow>
The accelerated aging time is：
<mrow>
<msub>
<mi>T</mi>
<mi>a</mi>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>T</mi>
<mi>c</mi>
</msub>
<msub>
<mi>K</mi>
<mrow>
<mi>T</mi>
<mn>2</mn>
</mrow>
</msub>
</mfrac>
</mrow>
Wherein, KT2For the corresponding accelerated factor of winding temperature；T02For the mean temperature of bearing；T12For what is set under accelerated test
The temperature of bearing；ε is life characteristics, ball bearing 3, roller bearing 10/3；TaFor the accelerated aging time；TcDuring actual life
Between.
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| CN110836777A (en) * | 2018-08-16 | 2020-02-25 | 郑州宇通客车股份有限公司 | Motor accelerated life test method and system |
| CN113607455A (en) * | 2021-10-08 | 2021-11-05 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Servo system life test method and device, computer equipment and storage medium |
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| CN110836777A (en) * | 2018-08-16 | 2020-02-25 | 郑州宇通客车股份有限公司 | Motor accelerated life test method and system |
| CN113607455A (en) * | 2021-10-08 | 2021-11-05 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Servo system life test method and device, computer equipment and storage medium |
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