CN109347405A - A kind of evaluation method and estimating system of motor rotor temperature - Google Patents
A kind of evaluation method and estimating system of motor rotor temperature Download PDFInfo
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- CN109347405A CN109347405A CN201811168426.2A CN201811168426A CN109347405A CN 109347405 A CN109347405 A CN 109347405A CN 201811168426 A CN201811168426 A CN 201811168426A CN 109347405 A CN109347405 A CN 109347405A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/66—Controlling or determining the temperature of the rotor
Abstract
The invention discloses a kind of evaluation method of temperature of rotor, it is included in when motor powers on and obtains static duration, lower electro-temperature and preset function, and initial temperature corresponding with lower electro-temperature and static duration is determined according to preset function；Temperature rise value when acquisition motor is in running order；Then initial temperature is added to obtain the Current Temperatures of rotor with temperature rise value, wherein a length of time difference for powering on the electric moment under moment and motor last time when static；Temperature when lower electro-temperature is electricity under the motor last time；Preset function is the function for describing the temperature of rotor after electricity under motor and changing over time.Evaluation method provided by the present application determines that motor powers on the initial temperature of moment rotor by preset function, the Current Temperatures of rotor is calculated on the basis of initial temperature, to improve the accuracy of estimation result.The invention also discloses the estimating systems of temperature of rotor, have above-mentioned beneficial effect.
Description
Technical field
The present invention relates to motor temperature control technology fields, more specifically to a kind of estimation of motor rotor temperature
Method, estimating system.
Background technique
Motor is the new energy power system components in conjunction with more technical fields such as electricity, magnetic, heat, machinery, close with its high-energy
The advantages that degree, high efficiency, is applied widely on electric vehicle.In the control of motor, temperature of rotor is obtained with very heavy
The meaning wanted, on the one hand, if motor rotor temperature is excessively high, be easy to appear that permanent magnetic steel is irreversible to move back in actual operation
Magnetic causes actual performance of motor to decline, and can reduce or eliminate demagnetization risk by monitoring motor rotor temperature.On the other hand,
Motor rotor temperature has stronger correlation with magnet steel performance, can further influence the computational accuracy of power drive system torque,
The deviation for causing vehicle performance to control.
When estimating in the prior art motor rotor temperature, it will usually after electric motor starting, stator temperature is monitored, and
Temperature of rotor is calculated in conjunction with the corresponding relationship of temperature of rotor and stator temperature.However, in actual use, the reality of rotor
Not only electric current is influenced temperature after by electric motor starting, and also possessed temperature is related on startup with itself.It is in the prior art
The temperature that rotor has when temperature estimation method usually ignores electric motor starting causes to have the estimation result of motor rotor temperature
Relatively large deviation influences motor working performance.
To sum up, the accuracy for how improving estimation temperature of rotor, is a problem to be solved by those skilled in the art.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of evaluation method of motor rotor temperature, estimating system, Neng Gouti
Height carries out the accuracy of estimation on line to temperature of rotor.
To achieve the goals above, the present invention provides a kind of evaluation method of motor rotor temperature, which includes:
When motor powers on, static duration, lower electro-temperature and preset function are obtained；Wherein, a length of when described static to power on
The time difference at electric moment under moment and the motor last time；Temperature when the lower electro-temperature is electricity under the motor last time
Degree；The preset function is the function that the temperature of rotor after electricity under the description motor changes over time；
Initial temperature corresponding with the lower electro-temperature and the static duration is determined according to the preset function；
Obtain the motor it is in running order when temperature rise value；
The initial temperature is added to obtain the Current Temperatures of the rotor with the temperature rise value.
Optionally, after being added to obtain the Current Temperatures of the rotor with the temperature rise value by the initial temperature, also
Include:
Judge the whether lower electricity of the motor；
If so, updating the lower electro-temperature, the temperature value of the updated lower electro-temperature is made to be equal to Current Temperatures
Temperature value；
Optionally, before judging the whether lower electricity of the motor, further includes:
The theoretical temperatures that the rotor is determined according to magnetic linkage density repair Current Temperatures according to the theoretical temperatures
Just, and using revised result as new Current Temperatures.
Optionally, before obtaining static duration, lower electro-temperature and preset function, further includes:
Motor and electric machine controller are kept connecting, the motor is controlled and is run with maximum power；
The motor is separated with the electric machine controller after motor temperature is stablized, and utilizes Dynamometer Control institute
The revolving speed for stating motor is reduced to 0；
Obtain the preset function that the temperature of the rotor changes over time.
Optionally, before obtaining static duration, lower electro-temperature and preset function, further includes:
Multiple target environment temperature are chosen in preset temperature range, obtain at a temperature of each target environment described turn
The alternative function that the temperature of son changes over time, the alternative function and the target environment temperature correspond；
Obtain current environmental temperature；
Judge all whether the target environment temperature includes current environmental temperature；
If so, will alternative function corresponding with current environmental temperature as the preset function；
If it is not, then determining the preset function according to the current environmental temperature.
Optionally, determine that the preset function includes: according to the current environmental temperature
The preset temperature range is divided into multiple temperature ranges according to all target environment temperature, and will be described
The temperature range where current environmental temperature is set as target temperature section；
Determine the corresponding lower limit target environment temperature in the target temperature section and upper limit target environment temperature；
Determine corresponding with the lower limit target environment temperature alternative function f (y) and with the upper limit target environment
The corresponding alternative function f (z) of temperature；
Correspondingly, described determining corresponding with the lower electro-temperature and the static duration initial according to the preset function
The process of temperature specifically:
Initial temperature corresponding with the lower electro-temperature and the static duration is determined by Exchanger Efficiency with Weight Coefficient Method.
Optionally, described that initial temperature corresponding with the lower electro-temperature and the static duration is determined by Exchanger Efficiency with Weight Coefficient Method
The process of degree specifically:
The first temperature difference A is set by the absolute value of the difference of the current environmental temperature and the lower limit target environment temperature,
The second temperature difference B is set by the absolute value of the difference of the current environmental temperature and the upper limit target environment temperature；
Determine that formula determines the preset function f (x) according to function；
Wherein, the function determine formula be f (x)=af (y)+bf (z), a and b be weight coefficient, a+b=1, andWithIt is negatively correlated.
Initial temperature corresponding with the lower electro-temperature and the static duration is determined according to the preset function；
Optionally, obtain the motor it is in running order when temperature rise value include:
Obtain the motor it is in running order when the rotor current rotating speed, current phase current and operation duration；
According to numerical model, determined by way of integral calculation with the operation duration, the current rotating speed, described work as
The corresponding temperature rise value of preceding phase current；Wherein, the numerical model is the unit time temperature rise for describing the rotor, phase current
With the model of the corresponding relationship of revolving speed；
Optionally, before judging all whether the target environment temperature includes the current environmental temperature, further includes:
According to the temperature change of the rotor described at a temperature of each target environment, the corresponding relationship of phase current and revolving speed
Generate multiple alternative models；Wherein, the alternative model and the target environment temperature correspond；
Correspondingly, after judging all whether the target environment temperature include the current environmental temperature, further includes:
If so, using the alternative model corresponding with the current environmental temperature as the numerical model；
If it is not, then determining the numerical model according to the current environmental temperature.
The application also provides a kind of estimating system of motor rotor temperature, which includes:
Parameter acquisition module, for obtaining static duration, lower electro-temperature and preset function when motor powers on；It is described static
Shi Changwei powers on the time difference at electric moment under moment and the motor last time；The lower electro-temperature is under the motor is last
Temperature when electric；The preset function is the function that the temperature of rotor after electricity under the description motor changes over time；
Initial temperature obtains module, for according to preset function determination and the lower electro-temperature and the static duration
Corresponding initial temperature；
Temperature rise obtain module, for obtain the motor it is in running order when temperature rise value；
Current Temperatures obtain module, obtain the current of the rotor for the initial temperature to be added with the temperature rise value
Temperature.
The evaluation method of motor rotor temperature provided by the invention is included in when motor powers on and obtains static duration, lower electricity
Temperature and preset function, and initial temperature corresponding with lower electro-temperature and static duration is determined according to preset function；Obtain motor
Temperature rise value when in running order；Then initial temperature is added to obtain the Current Temperatures of rotor with temperature rise value, wherein static
Shi Changwei powers on the time difference at electric moment under moment and motor last time；Temperature when lower electro-temperature is electricity under the motor last time；
Preset function is the function for describing the temperature of rotor after electricity under motor and changing over time.
The corresponding relationship that preset function changes over time the temperature of rotor after lower electricity is described, i.e. electricity operation on motor
Heat is generated in the process, and motor radiates to surrounding after electricity instantly, and with the growth of time, the temperature of rotor gradually decreases until ring
It keeps stablizing after the temperature of border.In preset function, rotor institute when can determine that motor powers on by lower electro-temperature and static duration
The temperature having, i.e. initial temperature；The temperature rise value for then obtaining rotor in motor operation course, by temperature rise value and initial temperature phase
Add and possessed actual temperature, i.e. Current Temperatures under rotor operation state can be obtained.
Evaluation method provided by the present application determines that motor powers on the initial temperature of moment rotor by preset function, initial
The Current Temperatures that rotor is calculated on the basis of temperature, to improve the accuracy of estimation result.Present invention also provides one kind
The estimating system of motor rotor temperature has above-mentioned beneficial effect, and details are not described herein.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the platform system schematic diagram of test temperature of rotor provided by the present invention；
Fig. 2 is the side view of motor in Fig. 1 provided by the present invention；
Fig. 3 is a kind of step flow chart of evaluation method provided by the present invention；
Fig. 4 is the step flow chart of another evaluation method provided by the present invention；
Fig. 5 is preset function curve graph provided by the present invention；
Fig. 6 for no phase current the condition temperature rise of lower rotor part unit time and revolving speed corresponding relationship；
Fig. 7 is the corresponding relationship for having the lower rotor part unit time temperature rise of phase current condition and revolving speed, phase current；
Fig. 8 is the logical schematic of evaluation method provided by the present invention；
Fig. 9 is a kind of structural schematic diagram of estimating system provided by the present invention.
Appended drawing reference in Fig. 1~9 are as follows:
Dynamometer machine 1, spline 2, motor fixed rack 3, motor 4, opening portion 5, end face 6, infrared radiation thermometer 7, infrared measurement of temperature
Instrument fix bracket 8, laptop 9, electric machine controller 10, environmental chamber 11, stator winding 12, rotor 13, temperature sensor 14,
Data collector 15, stator core 16；
Parameter obtains mould 100, initial temperature obtains module 200, temperature rise obtains module 300, Current Temperatures obtain module
400。
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1~9 is please referred to, Fig. 1 is the platform system schematic diagram of test temperature of rotor provided by the present invention；Fig. 2 is this
The side view of motor in Fig. 1 provided by inventing；Fig. 3 is a kind of step flow chart of evaluation method provided by the present invention；Fig. 4
For the step flow chart of another evaluation method provided by the present invention；Fig. 5 is preset function curve graph provided by the present invention；
Fig. 6 for no phase current the condition temperature rise of lower rotor part unit time and revolving speed corresponding relationship；Fig. 7 is to have phase current condition lower rotor part list
The corresponding relationship of position time temperature rise and revolving speed, phase current；Fig. 8 is the logical schematic of evaluation method provided by the present invention；Fig. 9
For a kind of structural schematic diagram of estimating system provided by the present invention.
With reference to Fig. 1 and Fig. 2, the application is by taking the platform system of the temperature of rotor provided in scheming as an example to implementation evaluation method
Process is illustrated.The platform system includes dynamometer machine 1, motor fixed rack 3, motor 4, electric machine controller 10, infrared measurement of temperature
The fixed bracket 8 of instrument 7, infrared radiation thermometer, laptop 9, the temperature sensor 14 for measuring stator temperature, acquisition stator temperature
The data collector 15 of degree and the environmental chamber 11 of temperature-controllable.
Motor 4 and electric machine controller 10 are fixed on motor fixed rack 3, in the stator core 16 of end face 6 uniformly
The temperature sensor 14 of distribution 8 or other quantity, to be measured to the temperature of stator core 16 and stator winding 12, temperature
The temperature value that degree sensor 14 measures is uploaded to laptop 9 by data collector 15.
Having opened up on the end face 6 of motor 4 makes inner rotator 13 be exposed to extraneous opening portion 5, and opening portion 5 can be in ladder
Shape, while being closed using germanite glass or other transparent materials.The end face of the rotor 13 of the inside of motor 4 is provided with using same
The coat of one color covering.
Infrared radiation thermometer 7 is fixedly mounted on the fixed bracket 8 of infrared radiation thermometer, remote sensing probe and rotor 13 on axis
Position is corresponding, to identify to the coat of 13 end face of rotor the measurement for trip temperature of going forward side by side, infrared radiation thermometer 7 and notebook
Computer 9 connects, and collected 13 temperature value of rotor is uploaded to laptop 9 by data line or wireless transmission signal.
The input shaft of dynamometer machine 1 carries out coaxial inner conductor connection by the output shaft of spline 2 and motor 4.Dynamometer machine 1 can be straight
The revolving speed for connecing control motor 4 carries out test experiments.In addition, dynamometer machine 1 is adopted and control unit and notebook electricity by built-in number
Brain 9 connects, its relevant parameter is acquired and is controlled.It should be understood that the data acquisition of platform system should ensure that with control
Temporal synchronization.
With reference to Fig. 3, the present invention provides a kind of evaluation method of temperature of rotor, specific steps may include:
Step S1, when motor 4 powers on, static duration, lower electro-temperature and preset function are obtained.
Specifically, power on/lower electricity refers specifically in the power on/off situation of electric machine controller 10, on electric machine controller 10 is completed
Electricity/lower electric control program.After powering on, motor 4 can generate heat in the process of running；Instantly after electricity, motor 4 is then dissipated to surrounding
Heat, with the growth of time, the temperature of rotor 13 is gradually decreased until keeping stablizing after environment temperature.
Preset function is the function that the temperature of rotor 13 after describing the lower electricity of motor 4 changes over time；Determining preset function
During, the lower electricity of control motor 4 is simultaneously detected using temperature of the infrared radiation thermometer 7 to rotor 13, while being recorded in difference
The variation relation of temperature possessed by time rotor 13, temperature and time can obtain two-dimensional diagram, according to two-dimensional diagram
It is fitted to the curve of the preset function with monotonicity.For example, being ordinate by abscissa, temperature value of time value with reference to Fig. 5
When, then preset function is in monotone decreasing trend.
The electric moment powered on the time difference at moment with this under static duration expression 4 last time of motor.Determining static duration
In the process, cumulative time length can be continued using the lower electric moment as start time and by electric machine controller 10；Or
The difference being calculated according to two time points that the moment electric under last time powers on the moment with this.Lower electro-temperature indicates on motor 4
Temperature possessed by principal moment rotor 13 is directly stored in electric machine controller 10 in lower electricity.
In actual use, preset function, lower electro-temperature can store in electric machine controller 10.When on motor 4
When electric, the lower electro-temperature stored, static duration and preset function are called directly.
Step S2, initial temperature corresponding with lower electro-temperature and static duration is determined according to preset function.
Specifically, lower electro-temperature and static duration are known parameters, and power on temperature since preset function is monotonic function
The temperature value of degree is less than the temperature value of last lower electro-temperature, therefore can directly determine motor 4 on this in conjunction with preset function
The initial temperature of rotor 13 when electric.For example, temperature corresponding with lower electro-temperature T1 and static duration ts is initial by taking Fig. 5 as an example
Temperature T1'.
It should be noted that if motor 4 is to power on for the first time, available current environmental temperature, and by current environmental temperature
Temperature value as rotor 13 initial temperature temperature value.
Step S3, temperature rise value when acquisition motor 4 is in running order.
Specifically, temperature rise value refers specifically to the variable quantity that motor 4 powers on the raising temperature of rear rotor 13, and temperature rise value and motor
The time of 4 operations is positively correlated, and the temperature rise value got is temperature rise value corresponding to current time.Obtain 13 temperature rise value of rotor
The mode that method and detailed process can be provided with reference to the prior art.
Step S4, initial temperature is added to obtain the Current Temperatures of rotor 13 with temperature rise value.
The present invention provides a kind of evaluation methods of 4 temperature of rotor of motor, and this method, which considers when motor 4 powers on, to be had
Influence of the initial temperature to 13 Current Temperatures of rotor.When powering on first with preset function calculating initial temperature, while
It powers on the temperature rise value of rear cumulative calculation rotor 13, and the current of rotor 13 when running is determined according to temperature rise value and initial temperature jointly
Temperature realizes the effect for improving estimation result accuracy.
With reference to Fig. 4, on the basis of the above embodiments, embodiment as one preferred, by initial temperature and temperature rise
Value addition obtains after the Current Temperatures of rotor 13, further includes:
Step S5, judge the whether lower electricity of motor 4；If so, entering step S6；
Step S6, lower electro-temperature is updated, the temperature value of updated lower electro-temperature is made to be equal to the temperature value of Current Temperatures；
Specifically, the present embodiment main purpose is the lower electro-temperature updated storage according to 13 operating condition of rotor, that is, will be electric
The temperature value of the Current Temperatures of rotor 13 is assigned to lower electro-temperature when machine 4 is lower electric, and updated lower electro-temperature is stored in motor
In controller 10, lower electro-temperature updated at this time is read when motor 4 powers on next time.When motor 4 switch repeatedly power on and
When power-down state, corresponding lower electro-temperature can be obtained every time by powering on, to ensure the continuous, accurate of 13 temperature estimation of rotor
It carries out.If the not lower electricity of motor 4, return step S3 continue the temperature rise value for obtaining rotor 13, and then constantly update rotor 13
Current Temperatures.
Further, with reference to Fig. 4, it is contemplated that after operation a period of time the Current Temperatures of calculated rotor 13 can be due to
Cumulative errors influence the accuracy of estimation result, in order to advanced optimize evaluation method, reduce the error of 13 Current Temperatures of rotor,
In the present embodiment, before judging the whether lower electricity of motor 4, further includes:
Step S7, the theoretical temperatures that rotor 13 is determined according to magnetic linkage density repair Current Temperatures according to theoretical temperatures
Just, and using revised result as new Current Temperatures.
Specifically, being modified after calculating Current Temperatures and before judging the whether lower electricity of motor 4.It is modified
Time is specifically chosen according to demand, for example, can be modified when 4 revolving speed of motor is greater than preset threshold rotation rate, Huo Zhe
It is modified after more than 4 start and stop of motor.In amendment, control electric machine controller 10 is in zero torque condition, utilizes measurement
4 back-emf of motor calculates current 4 magnetic linkage density of motor, and the motor that the manufacturer for the motor 4 purchased would generally provide
The bivariate table of magnetic linkage density and temperature of rotor, temperature of rotor corresponding with current magnetic linkage density is theoretical temperature in bivariate table
Degree.Using the temperature value of theoretical temperatures as the temperature value of calculated Current Temperatures, the amendment to Current Temperatures can be completed.
Further, in order to optimize evaluation method, on the basis of any one above-mentioned implementation, obtain static duration,
The preset function tested and determine motor 4 is first passed through before lower electro-temperature and preset function, specific determination process may include following
Step:
Motor 4 and electric machine controller 10 are kept connecting, control motor 4 is run with maximum power；
Motor 4 is separated with electric machine controller 10 after 4 temperature of motor is stablized, and controls turning for motor 4 using dynamometer machine 1
Prompt drop is 0；
Obtain the preset function that the temperature of rotor 13 changes over time.
Specifically, remaining that motor 4 is in natural cooling state, and utilize motor during determining preset function
Controller 10 control motor 4 continue with maximum power operation, temperature can gradually rise motor 4 in the process of running, when temperature not
Change again, thinks that 4 temperature of motor is stablized, and using 13 temperature of rotor at this time as maximum rotor temperature.Temperature utilizes after stablizing
4 revolving speed of motor is quickly reduced to 0 by dynamometer machine 1, and the data that the temperature for recording rotor 13 changes over time, until the temperature of rotor 13
Degree reaches the environment temperature of the offer of environmental chamber 11 and keeps stable, determines preset function using the data of record.It should be understood that
The temperature variations of rotor 13 after the lower electricity of the determination process simulation of preset function motor 4；In addition, the preset function determined
In, the maximum value of temperature is the temperature value of maximum rotor temperature, the temperature value of environment temperature during minimum value is test.
Further, it is contemplated that at different ambient temperatures, the temperature drop situation of rotor 13 after the lower electricity of motor 4, on motor 4
The temperature rise situation of rotor 13 can be varied after electricity, i.e., environment temperature will affect preset function and temperature rise value, therefore, in order to
The accuracy for improving evaluation method obtains static duration, lower electro-temperature and presets on the basis of any one above-mentioned embodiment
Before function, further includes:
Multiple target environment temperature are chosen in preset temperature range, obtain the temperature of each target environment temperature lower rotor part 13
The alternative function changed over time is spent, alternative function and target environment temperature correspond.
Specifically, preset temperature range can be 0 DEG C to 80 DEG C, the selection of unique step is more preferably in preset temperature range
A target environment temperature, such as 10 DEG C, 20 DEG C, 30 DEG C etc.；It can also rule of thumb or the ordinary temperature that is run in motor 4 of demand
The lower density for increasing target environment temperature, for example, motor 4 is bigger a possibility that operation under 20 DEG C to 40 DEG C of environment temperature,
Greater number of target environment temperature is then selected in the range of the environment temperature, is selected in the range of other environment temperatures
Small number of target environment temperature.
It should be understood that preset function is to carry out testing identified function under a known environment temperature, and it is standby
The experimentation of the experiment method and preset function that select function is consistent, and is only controlled motor 4 by environmental chamber 11 and is in difference
Environment temperature.Concretely, motor 4 is run at a temperature of a wherein target environment, is recorded in the target environment temperature
The temperature of degree lower rotor part 13 changes with time relationship, and generates alternative function corresponding with variation relation；Then, in other mesh
It marks and repeats to test under environment temperature, the determining alternative function correspondingly with each target environment temperature.
Obtain current environmental temperature；
Judge whether target complete environment temperature includes current environmental temperature；
If so, using alternative function corresponding with current environmental temperature as current preset function；
If it is not, then determining preset function according to current environmental temperature.
Specifically, current environmental temperature is obtained by temperature sensing class component when motor 4 is powered on, if current environment
Temperature is just identical as one of target environment temperature, then is determined as presetting by the corresponding alternative function of the target environment temperature
Function.
If the temperature value of the temperature value of current environmental temperature locating for motor 4 and any one target environment temperature not phase
Together, the smallest target environment temperature of the temperature difference of one with Current Temperatures can be chosen from target complete environment temperature, and should
The corresponding alternative function of target environment temperature is as preset function.
Further, in order to improve the accuracy of estimation result, preset function can be determined in conjunction with two alternative functions, because
This, in the present embodiment, the process of preset function is determined according to current environmental temperature specifically:
Preset temperature range is divided into multiple temperature ranges according to all target environment temperature, and by current environmental temperature
The temperature range at place is set as target temperature section；Determine the corresponding lower limit target environment temperature in target temperature section and the upper limit
Target environment temperature.
Specifically, during dividing temperature range, by target complete environment temperature according to the ascending order or drop of temperature value
Sequence is unified to be arranged.In addition, in order to improve the precision of preset function, preferably by the temperature between two adjacent target environment temperature
As a temperature range, it is under the temperature range is corresponding that temperature value is lower in two target environment temperature at this time in region
It is upper limit target environment temperature that it is higher, which to limit target environment temperature, temperature value,.
Determine alternative function corresponding with lower limit target environment temperature, hereinafter described for convenience, which is referred to as f
(y)；Alternative function corresponding with upper limit target environment temperature is determined simultaneously, and hereinafter described for convenience, which is referred to as f
(z)。
Finally combining alternative function is f (y) and f (z), passes through Exchanger Efficiency with Weight Coefficient Method determination and lower electro-temperature and static duration pair
The initial temperature answered.
Optionally, a kind of Exchanger Efficiency with Weight Coefficient Method provided by the present application calculates in the mode of initial temperature, passes through Exchanger Efficiency with Weight Coefficient Method
Determine the process of initial temperature corresponding with lower electro-temperature and static duration specifically:
The first temperature difference A is set by the absolute value of the difference of current environmental temperature and lower limit target environment temperature, front ring will be worked as
The absolute value of the difference of border temperature and upper limit target environment temperature is set as the second temperature difference B；
Determine that formula determines preset function f (x) according to function；
Wherein, function determines that formula be f (x)=af (y)+bf (z), a and b is weight coefficient, a+b=1, andWithIt is negatively correlated；
Initial temperature corresponding with lower electro-temperature and static duration is determined according to preset function.
For example, target environment temperature be 15 DEG C, 20 DEG C, 25 DEG C when, temperature range include (15 DEG C, 20 DEG C) and (20 DEG C, 25
℃).Current environmental temperature be 19 DEG C when, then target temperature section be (15 DEG C, 20 DEG C), lower limit target environment temperature be 15 DEG C,
Upper limit target environment temperature is 20 DEG C；It should be understood that current environmental temperature is closer to upper limit target environment temperature, then f (z)
Weight is bigger, i.e. the value of b is bigger.
Optionally, another Exchanger Efficiency with Weight Coefficient Method provided by the present application calculates in the mode of initial temperature, passes through weight coefficient
Method determines the process of initial temperature corresponding with lower electro-temperature and static duration specifically:
Initial temperature T corresponding with lower electro-temperature and quiescent time is determined according to f (y)A, while being determined under according to f (z)
Electro-temperature and quiescent time corresponding initial temperature TB；
Initial temperature T is determined according to formula, and wherein formula is T=aTA+b·TB, a and b are weight coefficient, a+b=1,
AndWithIt is negatively correlated.
It should be understood that the mathematical meaning and method of determination of a and b and the embodiment of a upper Exchanger Efficiency with Weight Coefficient Method are consistent
, details are not described herein again.In addition, being applied also under alternating temperature operating condition in such a way that Exchanger Efficiency with Weight Coefficient Method determines 13 temperature of rotor
Temperature estimation increases the scope of application of evaluation method.
Optionally, in a kind of embodiment of determining temperature rise value provided by the present application, when acquisition motor 4 is in running order
The process of temperature rise value specifically:
Current rotating speed, current phase current and the operation duration of rotor 13 when acquisition motor 4 is in running order.
According to numerical model, determination is corresponding with operation duration, current rotating speed, current phase current by way of integral calculation
Temperature rise value；Wherein, numerical model is the mould of the corresponding relationship of the unit time temperature rise for describing rotor 13, phase current and revolving speed
Type.
Specifically, establishing corresponding model generally according to temperature, revolving speed, phase current in the prior art, and according to model meter
Temperature rise value is calculated, however the calculating error of this kind of model is larger.According to pair of unit time temperature rise and revolving speed, phase current in the application
It should be related to and establish numerical model, further according to operation duration and numerical model, determine temperature rise value by way of integral, make to calculate
Temperature rise value out is more accurate.
The detailed process for establishing numerical model can refer to following manner:
Under the conditions of determining without phase current, the unit time temperature rise of rotor 13 and the corresponding relationship of revolving speed.Specifically, by motor
4 three-phase wire is remained disengaged from electric machine controller 10, that is, is set to no load test environment；Then motor 4 is kept to be in just
It often cools down and starts 1 dragging motor 4 of dynamometer machine and maintain rotating speed of target optional within the scope of preset rotation speed, wherein each target turns
Speed is preferably spaced fixed value within the scope of preset rotation speed；After 13 temperature of rotor of motor 4 is stablized, the revolving speed lower rotor part 13 is recorded
Temperature increase and duration used；Finally test and the data of record are analyzed and handled, obtains light condition condition
Under, the unit time temperature rise of rotor 13 and the corresponding relationship of revolving speed, as shown in Figure 6.
It determines under the conditions of having phase current, the temperature rise of rotor unit time and phase current, revolving speed corresponding relationship.Specifically, by electric
The three-phase wire and electric machine controller 10 of machine 4 keep connecting, that is, are set to band and carry test environment；Then motor 4 is kept to be in
It is normal cooling and control motor 4 and maintain selected rotating speed of target, it is run using different target phase current, wherein target phase current
Range is no more than the maximum phase current allowed under the revolving speed；After 13 temperature of rotor of motor 4 is stablized, the revolving speed, difference are recorded
The temperature increase of 4 rotor 13 of motor and duration used under the conditions of phase current.
It repeats aforesaid operations under other rotating speed of target to carry out test experiments and record data, to the number of test and record
According to being analyzed and handled, obtains band and carry under status condition, the corresponding relationship of the temperature rise of rotor unit time and phase current, revolving speed
Numerical model, as shown in Figure 7.
Further, it is contemplated that environment temperature equally has influence to the temperature rise value of 4 operation phase of motor rotor 13, is
The accuracy for further increasing estimation result on the basis of any one above-mentioned embodiment is judging target complete environment
Before whether temperature includes current environmental temperature, further includes:
It is generated according to the corresponding relationship in the temperature change of each target environment temperature lower rotor part 13, phase current and revolving speed more
A alternative model；Wherein, alternative model and target environment temperature correspond；
And after judging whether target complete environment temperature includes current environmental temperature, further includes:
If so, using alternative model corresponding with current environmental temperature as current numerical model；
If it is not, then determining numerical model according to current environmental temperature.
Specifically, the method for determination of alternative model is similar with the method for determination of numerical model, concretely, pass through environment
Cabin 11 makes the temperature value of Current Temperatures be equal to the temperature value of one of target environment temperature, and then progress test experiments, which determine, is somebody's turn to do
Alternative model at a temperature of target environment；Current Temperatures are then adjusted, retest is tested at a temperature of other each target environments
Corresponding alternative model is determined respectively.
When motor 4 powers on, obtains current environmental temperature and is compared current environmental temperature with target environment temperature,
And then determine the corresponding numerical model of current environmental temperature.It should be understood that can equally be used during calculating temperature rise value
Exchanger Efficiency with Weight Coefficient Method, specific calculation can refer to the embodiment above for Exchanger Efficiency with Weight Coefficient Method and do simple deformation, herein no longer
It repeats.
Since current rotating speed, current phase current can be sent to laptop 9 from the CAN bus of electric machine controller 10
Middle preservation, therefore current rotating speed and current phase current can be directly read.When motor 4 is run, according to current environmental temperature from more
Corresponding numerical model is determined in a reserved type module, and the temperature rise of rotor 13 is then determined according to current rotating speed, current phase current
Value.
Fig. 9 is referred to, present invention also provides a kind of estimating system of temperature of rotor, which may include:
Parameter obtains mould 100, for obtaining static duration, lower electro-temperature and preset function when motor 4 powers on；When static
A length of time difference for powering on moment and the last lower electric moment of motor 4；Lower electro-temperature is temperature when motor 4 is last lower electric；
Preset function is the function that the temperature of rotor 13 after describing the lower electricity of motor 4 changes over time；
Initial temperature obtains module 200, corresponding with lower electro-temperature and static duration first for being determined according to preset function
Beginning temperature；
Temperature rise obtain module 300, for obtain motor 4 it is in running order when temperature rise value；
Current Temperatures obtain module 400, obtain the Current Temperatures of rotor 13 for initial temperature to be added with temperature rise value.
Since the embodiment of estimating system part is corresponded to each other with the embodiment of evaluation method part, estimating system portion
The embodiment divided refers to the description of the embodiment of evaluation method part, and which is not described herein again.
With reference to Fig. 8, it is illustrated below by logic of the Fig. 8 to evaluation method provided by the present application.Pass through system first
When powering on, initial temperature obtains 13 temperature of rotor of system storage when module 200 reads static duration ts and preceding principal
T1', and calculate the initial temperature T of rotor 13 when this is powered onin.In addition, motor operating state judgment module is according to 4 turns of motor
Fast NmotWith 4 torque T of motormotJudge 4 operating status of motor and output identification Sf.In addition, temperature rise obtains the rotor in module 300
Unit time temperature rise acquisition submodule is according to 4 Status Flag S of motorf, environment temperature T' and phase current I calculate rotor unit
Time Wen Sheng ⊿ Tdel, then the temperature rise value through 13 temperature rise computational submodule of the rotor acquisition rotor 13 in temperature rise acquisition module 300
Tdel.Then, by 13 initial temperature T of rotorinWith the continuous 13 temperature rise T of rotor for calculating and updatingdelIt is added, works as to obtain rotor 13
Preceding temperature T0, by temperature adjustmemt module by the Current Temperatures T of rotor 130It is modified to T0'；To T when electric under final system0' carry out
Otherwise storage is input to the use of other function module to transfer when next system electrification.
Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.It should be pointed out that for those skilled in the art, under the premise of not departing from the application principle, also
Can to the application, some improvement and modification can also be carried out, these improvement and modification also fall into the protection scope of the claim of this application
It is interior.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.Under the situation not limited more, the element limited by sentence "including a ..." is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (10)
1. a kind of evaluation method of motor rotor temperature characterized by comprising
When motor powers on, static duration, lower electro-temperature and preset function are obtained；Wherein, a length of when described static to power on the moment
With the time difference at moment electric under the motor last time；Temperature when the lower electro-temperature is electricity under the motor last time；Institute
State the function that the temperature that preset function is rotor after electricity under the description motor changes over time；
Initial temperature corresponding with the lower electro-temperature and the static duration is determined according to the preset function；
Obtain the motor it is in running order when temperature rise value；
The initial temperature is added to obtain the Current Temperatures of the rotor with the temperature rise value.
2. evaluation method according to claim 1, which is characterized in that the initial temperature to be added with the temperature rise value
After obtaining the Current Temperatures of the rotor, further includes:
Judge the whether lower electricity of the motor；
If so, updating the lower electro-temperature, the temperature value of the updated lower electro-temperature is made to be equal to the temperature of Current Temperatures
Value.
3. evaluation method according to claim 2, which is characterized in that before judging the whether lower electricity of the motor, also wrap
It includes:
The theoretical temperatures that the rotor is determined according to magnetic linkage density are modified Current Temperatures according to the theoretical temperatures, and
Using revised result as new Current Temperatures.
4. evaluation method according to claim 1, which is characterized in that obtaining static duration, lower electro-temperature and default letter
Before number, further includes:
The motor and electric machine controller are kept connecting, the motor is controlled and is run with maximum power；
The motor is separated with the electric machine controller after motor temperature is stablized, and utilizes electricity described in Dynamometer Control
The revolving speed of machine is reduced to 0；
Obtain the preset function that the temperature of the rotor changes over time.
5. evaluation method described in any one according to claim 1~4, which is characterized in that obtain static duration, lower electro-temperature
Before preset function, further includes:
Multiple target environment temperature are chosen in preset temperature range, the rotor at a temperature of each target environment of acquisition
The alternative function that temperature changes over time, the alternative function and the target environment temperature correspond；
Obtain current environmental temperature；
Judge all whether the target environment temperature includes current environmental temperature；
If so, will alternative function corresponding with current environmental temperature as the preset function；
If it is not, then determining the preset function according to the current environmental temperature.
6. evaluation method according to claim 5, which is characterized in that determined according to the current environmental temperature described default
Function includes:
The preset temperature range is divided into multiple temperature ranges according to all target environment temperature, and will be described current
The temperature range where environment temperature is set as target temperature section；
Determine the corresponding lower limit target environment temperature in the target temperature section and upper limit target environment temperature；
Determine corresponding with the lower limit target environment temperature alternative function f (y) and with the upper limit target environment temperature
The corresponding alternative function f (z)；
Correspondingly, described determine initial temperature corresponding with the lower electro-temperature and the static duration according to the preset function
Process specifically:
Initial temperature corresponding with the lower electro-temperature and the static duration is determined by Exchanger Efficiency with Weight Coefficient Method.
7. evaluation method according to claim 6, which is characterized in that described to pass through Exchanger Efficiency with Weight Coefficient Method determination and the lower electricity
The process of temperature and the corresponding initial temperature of the static duration specifically:
The first temperature difference A is set by the absolute value of the difference of the current environmental temperature and the lower limit target environment temperature, by institute
The absolute value of the difference for stating current environmental temperature and the upper limit target environment temperature is set as the second temperature difference B；
Determine that formula determines the preset function f (x) according to function；
Wherein, the function determines that formula be f (x)=af (y)+bf (z), a and b is weight coefficient, a+b=1, andWithIt is negatively correlated；
Initial temperature corresponding with the lower electro-temperature and the static duration is determined according to the preset function.
8. evaluation method according to claim 7, which is characterized in that obtain the motor it is in running order when temperature rise
Value includes:
Obtain the motor it is in running order when the rotor current rotating speed, current phase current and operation duration；
It is determined and the operation duration, the current rotating speed, the current phase according to numerical model, by way of integral calculation
The corresponding temperature rise value of electric current；Wherein, the numerical model is the unit time temperature rise for describing the rotor, phase current and turns
The model of the corresponding relationship of speed.
9. evaluation method according to claim 8, which is characterized in that judging all whether the target environment temperature wraps
Before the current environmental temperature, further includes:
It is generated according to the corresponding relationship of the temperature change of the rotor described at a temperature of each target environment, phase current and revolving speed
Multiple alternative models；Wherein, the alternative model and the target environment temperature correspond；
Correspondingly, after judging all whether the target environment temperature include the current environmental temperature, further includes:
If so, using the alternative model corresponding with the current environmental temperature as the numerical model；
If it is not, then determining the numerical model according to the current environmental temperature.
10. a kind of estimating system of motor rotor temperature characterized by comprising
Parameter acquisition module, for obtaining static duration, lower electro-temperature and preset function when motor powers on；The static duration
For the time difference for powering on the electric moment under moment and the motor last time；When the lower electro-temperature is electricity under the motor last time
Temperature；The preset function is the function that the temperature of rotor after electricity under the description motor changes over time；
Initial temperature obtains module, for corresponding with the lower electro-temperature and the static duration according to preset function determination
Initial temperature；
Temperature rise obtain module, for obtain the motor it is in running order when temperature rise value；
Current Temperatures obtain module, obtain the current temperature of the rotor for the initial temperature to be added with the temperature rise value
Degree.
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| CN110138312A (en) * | 2019-05-13 | 2019-08-16 | 浙江吉利控股集团有限公司 | A kind of motor rotor temperature estimation method, device and controller |
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| CN110932490A (en) * | 2019-11-22 | 2020-03-27 | 上海电气电站设备有限公司 | Method for calculating forced excitation temperature of rotor of double-water internal cooling non-salient pole synchronous motor |
| CN110932490B (en) * | 2019-11-22 | 2021-10-15 | 上海电气电站设备有限公司 | Method for calculating forced excitation temperature of rotor of double-water internal cooling non-salient pole synchronous motor |
| CN112865665A (en) * | 2021-01-26 | 2021-05-28 | 大陆汽车电子(长春)有限公司 | Electronic control unit and computer program product for driving an electric machine in a sensorless manner |
| CN112865665B (en) * | 2021-01-26 | 2022-12-02 | 大陆汽车电子(长春)有限公司 | Electronic control unit for driving an electric motor in a sensorless manner |
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