CN114172435B - Post-processing method, system and computer readable storage medium for operation noise and vibration data of asynchronous motor - Google Patents
Post-processing method, system and computer readable storage medium for operation noise and vibration data of asynchronous motor Download PDFInfo
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- CN114172435B CN114172435B CN202111446640.1A CN202111446640A CN114172435B CN 114172435 B CN114172435 B CN 114172435B CN 202111446640 A CN202111446640 A CN 202111446640A CN 114172435 B CN114172435 B CN 114172435B
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
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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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention relates to a post-processing method, a system and a computer readable storage medium of running noise and vibration data of an asynchronous motor, which are characterized in that firstly, the colourmap is calculated through the rotor rotating speed n, the stator order number and trend of a low slip S in a higher vehicle speed state are identified, and then the actual order number corresponding to the stator rotating speed is determined by comparing with a stator structure; according to the actual trend of the order, taking a point to simulate and calculate, and generating the rotating speed n1 of the stator magnetic field. The stator magnetic field n1 is used for recalculating the color, so that the problem that the stator order in the test data of the asynchronous motor deviates along with the rotating speed load of the rotor can be solved, the slip ratio in the noise vibration data of the asynchronous motor is eliminated by phase change, the main noise order (such as electromagnetic order, zero-shift order and the like) information in the operation process of the asynchronous motor is accurately identified, the peak value of the noise order of the asynchronous motor along with the rotating speed can be accurately extracted, and the NVH development efficiency of the asynchronous motor is effectively improved.
Description
Technical Field
The invention relates to a processing technology of motor operation noise and vibration, in particular to a processing technology of noise vibration test data of an asynchronous driving motor.
Background
The electric drive system carried by the new energy vehicle type is basically a permanent magnet synchronous motor, a stator magnetic field is generated by an input symmetrical three-phase alternating current power supply, a rotor magnetic field is generated by a permanent magnet, and the rotating speed n of a motor rotor is always the same as the rotating speed n1 of the stator magnetic field; the interaction between the two magnetic fields can make the motor rotor output and input torque. The electric drive main order characteristic of the carrying synchronous motor is the same as that of the traditional power assembly calculation method, only the speed of the vehicle, or the rotation speed of a half shaft, or the information of a CAN line is required to be recorded, or the rotation speed of the motor in a CAN signal is read, namely the real-time rotation speed of a rotor is directly read through a rotation speed sensor, and then the rotation speed of the electric drive rotor is calculated or directly obtained by combining with a speed reducer structure, so that the required electric drive order characteristic is further calculated.
For a new energy vehicle type carrying an asynchronous motor, because the working principle of the asynchronous motor is greatly different from that of a permanent magnet synchronous motor, the asynchronous motor needs to form induced potential and induced current in a rotor cage winding through the rotation speed difference between the rotation speed of a stator magnetic field and the rotation speed of a rotor, and further generates a rotor self-rotating magnetic field. The noise vibration test data read by the rotating speed of the rotor is caused, the main electromagnetic orders of the stator are all changed at any time, cannot be extracted, and further cannot be subjected to objective order quantitative comparison. In the NVH development process of the electric drive project carrying the asynchronous motor, great difficulty is generated.
The asynchronous motor carried by the new energy vehicle type is also called an induction motor, has the characteristics of simple structure, no demagnetization problem, convenient manufacture, use and maintenance and the like, and mainly comprises basic components such as a stator, a rotor, an end cover, a bearing and the like; the stator comprises an armature winding, a magnetic conductive iron core and a base, and when symmetrical three-phase positive rotation current with specific frequency f1 is input into the armature winding of the stator, a rotating magnetic field with rotating speed n1 is generated in breath between the stator and the rotor; the rotor structure mainly comprises a cage winding, a magnetic conductive iron core, a rotating shaft and the like, wherein the cage winding and a rotating magnetic field of a stator perform relative motion, and induced electromotive force and induced current are generated in a closed winding in the rotor; further, the rotating magnetic field of the stator interacts with the current of the rotor conductor to generate electromagnetic torque, so that the rotor obtains a corresponding rotating speed n. The stator magnetic field rotating speed n1 and the rotor magnetic field rotating speed n always keep different, so the asynchronous motor is called. The slip ratio s of the asynchronous motor is a rotating magnetic field rotating speed n1 generated after a stator inputs symmetrical three-phase current with fixed frequency f1 and a magnetic field rotating speed n generated by induced current in a rotor closed winding, wherein the difference (n 1-n) between the rotating speeds of the two magnetic fields is called as a rotating speed difference, and the ratio (n 1-n)/n 1 of the rotating speed difference and the rotating speed of the stator is defined as the slip ratio s; according to the slip S value, the working state of the asynchronous motor at any moment can be directly judged, and mainly is the running state of the generator (S < 0), the running state of the motor (0 < S < 1) and the electromagnetic braking state (S > 1).
The permanent magnet synchronous motor is characterized by that the stator structure is identical to that of asynchronous motor, and the permanent magnet is inlaid on the rotor, and in the interior of motor the rotor magnetic field is always existed in the air, and when the symmetrical three-phase positive-rotation current with specific frequency f1 is inputted into the stator armature winding, the rotating magnetic field of rotating speed n1 produced by stator is produced in the air, and then is interacted with rotor magnetic field so as to make the rotor obtain identical n1 rotating speed.
Disclosure of Invention
The invention aims to provide a data post-processing method for running noise vibration of an asynchronous motor for an automobile, so as to solve the problem that the order is offset along with the rotating speed load caused by slip in test data of the asynchronous motor.
The asynchronous motor for the automobile has the characteristics of simple structure, convenient manufacture, use and maintenance and the like, and mainly comprises basic components such as a stator, a rotor, an end cover, a bearing and the like; the stator comprises an armature winding, a magnetic conductive iron core and a base, when symmetrical three-phase positive rotation current with specific frequency f1 is input into the armature winding of the stator, a rotating magnetic field with the rotating speed of n1 is generated in air between the stator and the rotor; the rotor structure mainly comprises a cage winding, a magnetic conductive iron core, a rotating shaft and the like, wherein the cage winding and a rotating magnetic field of a stator perform relative motion, a closed winding in the rotor generates induced electromotive force and induced current, the rotating magnetic field of the stator and the current of a rotor conductor interact to generate electromagnetic torque, and the rotor obtains a rotating speed n; the stator magnetic field rotating speed n1 and the rotor magnetic field rotating speed n always keep different, and the rotating speed difference exists, so the asynchronous motor is called.
The order is the response of vibration and noise of the structural rotating component caused by rotation, and the corresponding order response has a fixed corresponding relation with the rotating speed and the fundamental frequency and does not change along with the change of the rotating speed; i.e. the order is a multiple of the frequency corresponding to the rotational speed, which remains unchanged for the rotational speed. If the 1 order is the corresponding frequency of the rotating speed, the K order is K times of the rotating frequency, and the ratio between the fixed order and the rotating frequency is kept unchanged.
The rotating speed difference of the asynchronous motor is a rotating magnetic field rotating speed n1 generated after the stator inputs symmetrical three-phase current and a magnetic field rotating speed n generated by induced current in a rotor closed winding, the difference (n 1-n) of the rotating speeds of the two magnetic fields is called as a rotating speed difference, and the ratio (n 1-n)/n 1 of the rotating speed difference and the rotating speed of the stator is defined as a slip ratio s.
The slip ratio causes the order to deviate along with the rotation speed and the load of the rotor, which is a special phenomenon existing in the running process of the asynchronous motor; slip ratio varies with motor speed and load. The whole vehicle state is convenient for collecting the rotating speed information, mainly including the rotating speed (such as the vehicle speed, the wheel speed, the half shaft rotating speed and the like) related to the rotating speed n of the rotor, and only corresponds to the rotating speed of the rotating magnetic field of the rotor. The stator rotating magnetic field rotation speed n1 cannot be read, the slip s changing with time changes in real time, and the relation with the rotor magnetic field rotation speed n is n1=n (1-s). When the components of the orders of the acceleration and deceleration working conditions of the motor and the source are analyzed, the corresponding relation between the electromagnetic orders corresponding to the stator and other parts and the rotating speed of the rotor is changed at any time, so that the order extraction method in the traditional data processing is invalid, and the extraction target order cannot be identified. Taking the 12 th order of the number of poles of the stator of the asynchronous motor as an example: when the rotating speed of the rotor is higher than 3000rpm, 12.4-12.3 steps are displayed; the rotor runs at a low speed and a high torque of 0-3000 rpm and shows 24-12.3 steps; in the acceleration process, the 12 th order of the stator is in a change state at moment and cannot be extracted for objective comparison analysis by calculating the rotation speed of the rotor.
The post-processing method for analyzing the running noise and vibration of the asynchronous motor is characterized in that the stator order of the asynchronous motor cannot be extracted due to the fact that the rotor rotating speed n is used for reading the order of the stator structure, the order number changes with the rotating speed and the load moment and is offset. Through post-treatment, the stator rotating speed n1 is directly generated, and then the corresponding stator order is extracted through the stator magnetic field rotating speed n1, so that the problem that the stator order deviates along with the rotating speed load due to slip is solved.
Aiming at the problems, in order to realize the efficient and accurate extraction of the running noise orders of the asynchronous motor, the invention provides a method capable of eliminating the order deviation problem in the processing of the running noise vibration data of the asynchronous motor, which comprises the steps of firstly calculating the colourmap through the rotor rotating speed n, identifying the stator order number and trend of the low slip S in a higher vehicle speed state, and then comparing the stator structure to determine the actual order number corresponding to the stator rotating speed; according to the actual trend of the order, taking a point to simulate and calculate, and generating the rotating speed n1 of the stator magnetic field. The stator order in the test data of the asynchronous motor can be eliminated along with the load offset of the rotor rotating speed by recalculating the color through the rotating speed n1 of the stator magnetic field, and the aim of eliminating the slip in the noise vibration data of the asynchronous motor in a phase-changing manner is fulfilled.
The post-processing method for analyzing the running noise and vibration of the asynchronous motor comprises the following steps:
step 1: test data preprocessing: and calculating a color chart color of the acceleration process data through the rotor rotating speed n of the asynchronous motor to obtain primary edition data with order offset.
Step 2: stator order identification: according to the slip ratio s= (n 1-n)/n 1 formula of the asynchronous motor, identifying the stator order of a high-rotation-speed section of a rotor of the asynchronous motor, determining the electromagnetic order trend of the stator, selecting specific points of 3-5 high-rotation-speed sections of the order, positioning the low-rotation-speed section in order position, calculating the rotation speed of the stator according to the order continuity principle, and recording the frequency, time, rotor rotation speed and other information of the specific points.
Step 3: calculating the stator magnetic field rotating speed n1 in a simulation mode: according to the specific points recorded in the rotor rotating speed colourmap, in FFT vs time domain signals of the rotating speed simulation function of the data processing software, according to the recorded information such as the frequency, the time, the rotor rotating speed and the like of 3-5 high rotating speed specific points, the stator fixed order position is identified, and then the description of the rotating speed simulation points of each rotating speed section is completed through order continuity characteristics, so that the stator magnetic field rotating speed n1 is calculated.
Step 4: data synthesis, processing and checking: and (3) deriving data containing the stator magnetic field rotating speed n1, recalculating an acceleration process color by adopting the stator magnetic field rotating speed n1 according to the step (1), checking that the ratio between the 12 th order of the stator and other orders and the stator rotating speed is kept unchanged, and calculating the stator magnetic field rotating speed n1 successfully when the offset bending phenomenon of the orders along with the rotor rotating speed and the load disappears.
Further, the motor rotor rotation speed n is obtained: reading the vehicle speed through a vehicle speed sensor, and converting the vehicle speed into the rotation speed of a half shaft through the size of a tire; and further calculating and converting the motor rotor rotation speed n through the gear ratio of the speed reducer and the rotor. Or directly reading and recording the rotation speed of the half shaft through a photoelectric sensor, and calculating the rotation speed n of the motor rotor through the gear ratio of the speed reducer and the rotor.
Further, the test data in step 1 are noise vibration data corresponding to acceleration and deceleration working conditions of the whole vehicle obtained by test and record in actual road conditions through noise vibration test equipment, wherein a microphone, a vibration sensor and a vehicle speed or half-shaft rotation speed sensor are arranged at a position with requirements.
Further, the method is applied to automobiles, including but not limited to pure electric automobiles, hybrid electric automobiles, fuel cell automobiles and the like, and also can be common internal combustion engine powered automobiles provided with asynchronous motors.
The invention adopts the technical proposal and has the following technical effects:
1. the invention can calculate the rotating speed of the stator magnetic field according to the structural characteristics of the stator and the test data, can accurately extract the required running orders of the asynchronous motor, and can solve the problem of the offset of the orders along with the rotating speed load in the test data of the asynchronous motor, wherein the main electromagnetic orders comprise but not limited to the fundamental frequency and the frequency multiplication of the pole pair orders, the fundamental frequency and the frequency multiplication of the stator slot orders, the fundamental frequency and the frequency multiplication of the switching frequency and the zero shift orders, and the like.
2. The method can remarkably improve the accuracy of extracting the stator order data of the asynchronous motor, particularly the accuracy of the motor order peak value at low rotation speed and high torque, and can greatly improve the efficiency of processing the data of the asynchronous motor.
3. According to the stator magnetic field rotating speed n1 obtained through post-processing, the slip of the asynchronous motor corresponding to each moment of the motor can be further calculated, the working state of the asynchronous motor can be directly confirmed according to the slip of each moment, and the result cannot be obtained by the conventional slip method.
Drawings
FIG. 1 is a flow chart of an implementation of the present invention;
FIG. 2 is a schematic diagram of the order of rotor speed calculation with speed load shift of an asynchronous motor according to the present invention;
FIG. 3 is a schematic illustration of the stator order description of the asynchronous motor of the present invention;
FIG. 4 is a graph comparing stator and rotor speeds during acceleration of an asynchronous motor according to the present invention;
FIG. 5 is a 12 th order plot of asynchronous motor stator speed calculation with no speed load offset according to the present invention;
fig. 6 is a graph showing slip ratio change with acceleration time and vehicle speed in the acceleration process of the asynchronous motor.
In the figure: 1-reading the actual order of the 12 th order of the stator in the high-speed section at the rotor speed, 2-reading the actual order of the 12 th order of the stator in the low-speed section at the rotor speed, 3-calculating the simulation point of the speed at the order, and 4-reading the 12 th order of the stator at the stator speed.
Detailed Description
The technical solutions implemented by the present invention will be further described with reference to the accompanying drawings in the specification, and the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments in the present invention are all within the scope of protection of the present invention.
In the running process of the asynchronous motor, a rotating speed difference exists between the rotating speed n1 of the stator magnetic field and the rotating speed n of the rotor magnetic field, the rotating speed difference causes the phenomenon that the main orders shift along with the rotating speed load in the vibration analysis process of running noise of the asynchronous motor, and the motor cannot be extracted by the traditional methods of tracking the rotating speed of the rotor, the rotating speed of a half shaft, the speed of the vehicle and the like of the motor. The method provided by the invention can eliminate the problem that the motor order can not be extracted along with the load deviation of the rotating speed caused by the rotating speed difference in the acceleration and deceleration processes of the asynchronous motor, is used for accurately identifying the main noise order (such as electromagnetic order, zero shift order and the like) information in the operation process of the asynchronous motor, can accurately extract the variation peak value of the noise order of the asynchronous motor along with the rotating speed, and effectively improves the NVH development efficiency of the asynchronous motor.
Example 1:
FIG. 1 shows a detailed implementation flow of the invention, which comprises the following specific steps:
step 1: and calculating the half shaft rotating speed n2.
And determining the state of the recorded vehicle speed signal in the noise vibration data by combining the actual test state of the running noise of the whole vehicle motor, and converting the vehicle speed signal into a half-shaft rotating speed signal. If the half shaft rotation speed is directly recorded or the motor rotor signal is included in the CAN information, the step CAN be skipped.
Taking only vehicle speed information in the test data as an example, if the wheel model is 235/45R 16 (the width/width ratio hub diameter is 24.5 mm), the hub diameter can be calculated to be 753mm; and calculating a conversion parameter between the vehicle speed and the rotation speed of the half shaft to 0.14185 according to a formula v=w×r between the linear speed and the radius of the angular speed, and then completing conversion from the vehicle speed to the rotation speed of the half shaft to generate a rotation speed signal n2 of the half shaft.
Step 2: and calculating the rotating speed of the rotor.
And deducing the rotating speed n of the motor rotor according to the total reduction ratio of the speed reducer. If the CAN line information recorded by the test data contains the rotating speed of the motor rotor, the step CAN be skipped.
Here, taking an electric drive speed reducer of a certain vehicle type as an example, the total reduction ratio between an input shaft and an output shaft of the speed reducer is 11.135, and the motor rotor speed n=n2× 11.135 can be calculated according to the existing half-shaft speed n2.
Step 3: pretreatment of test data.
And (3) calculating a color chart color of acceleration process data by adopting noise vibration processing software such as HEADArtemis, LMS in the NVH field and the like through the rotor rotating speed n of the asynchronous motor to obtain primary data with order offset, wherein the primary data adopts the rotor rotating speed n of the asynchronous motor.
In order to facilitate data identification, the noise and vibration data processing resolutions are 5 Hz, and the step-up speed is as follows: the speed step size of the vehicle is 0.5km/h, or equivalent half-shaft rotating speed step size, or equivalent motor rotating speed step size.
Step 4: and (5) identifying the stator order.
According to the definition of a slip ratio s= (n 1-n)/n 1 formula of the asynchronous motor, the larger the rotating speed n1 of the stator magnetic field is, the larger the denominator is, and the smaller the slip ratio is; it can be determined that the asynchronous motor is operated at a high rotation speed (more than 3000rpm in the actual project), and in the color chart calculated by the rotation speed of the rotor, the offset of the stator structure order caused by the slip ratio can be greatly reduced. Taking the 12 th order of the stator as an example, in the calculated colourmap 1 calculated by using the rotor rotation speed, the rotation speed of the rotor is more than 3000rpm, the 12 th order of the stator structure is in the 12.4-12.3 th order, and the method can be directly used for identifying and positioning the 12 th order of the stator; further, according to the order continuity characteristic, the change trend of the stator in the low rotation speed range of 0-3000 rpm of the 12 th order of the stator can be identified, and the 12 th order of the stator is rapidly changed from the range of 24-12.3 th order 8. According to the electromagnetic order trend determined by the operation, specific points of 3-5 high-rotation-speed sections of the order are selected, the order positions of the low-rotation-speed sections are positioned when the rotation speed of the stator is calculated according to the order continuity principle, and information such as the frequency, the moment, the rotation speed of the rotor and the like of the specific points is recorded so as to facilitate the next simulation.
Taking a certain type of asynchronous electric drive speed-up data as an example, referring to fig. 2, test data adopts the rotor rotating speed of an asynchronous motor to calculate the acceleration process color, the 12 th order of a stator, and the rotating speed above 3000rpm is about 12.4-12.3 th order 7, so that the test data can be directly used for identifying and positioning the 12 th order of the stator; further, according to the order continuity, a low rotation speed range change trend of the 12 th order of the stator at 0-3000 rpm is identified, the 12 th order of the stator is rapidly changed from the range of 24-12.3 th order 8, and information such as frequency, time and rotor rotation speed of feature points is recorded.
Step 5: and simulating and calculating the rotating speed n1 of the stator magnetic field.
According to the specific points recorded in the rotor rotation speed colourmap, in FFT vs time signals in a rotation speed simulation function interface of data processing software, according to the recorded information such as frequency, time, rotor rotation speed and the like of more than 5 specific points, the change trend of the stator fixed order is identified, and the stator magnetic field rotation speed n1 is obtained by dotting and calculating.
According to the specific points recorded in the rotor rotation speed colourmap, in FFT vs time domain signals of the rotation speed simulation function of data processing software such as HEADArtemis, LMS, according to the recorded information such as the frequency, time and rotor rotation speed of 3-5 high rotation speed specific points, the stator fixed order position is identified, and then the description of the rotation speed simulation points of each rotation speed section is completed through order continuity characteristics, so that the stator magnetic field rotation speed n1 is calculated.
Referring to fig. 3, the stator of the asynchronous motor is in a 6-pole 54-slot structure, the 54 th order position of the stator in the FFT vs. time in the acceleration process is determined, the 54 th order trend is determined by drawing a point 3 on the 54 th order of the stator, and the stator magnetic field rotating speed n1 is calculated.
Step 6: data synthesis, processing and checking.
Data including the stator magnetic field rotation speed n1 is derived by a data re-derivation function of data processing software such as HEADArtemis, LMS. According to step 1, the stator magnetic field rotating speed n1 is adopted to recalculate the acceleration process color, the ratio between the 12 th order of the stator and other orders and the stator rotating speed is checked to be unchanged, the orders disappear along with the offset bending phenomenon of the rotor rotating speed and the load, and the stator magnetic field rotating speed n1 is successfully calculated. According to the existing stator magnetic field rotating speed n1 and rotor rotating speed n, the information with requirements such as the slip ratio changing along with the acceleration process, the speed changing along with the speed of the vehicle and the like can be calculated.
Example 2
The present embodiment is a post-processing system for analyzing operation noise and vibration of an asynchronous motor for an automobile, which includes a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the post-processing method for analyzing operation noise and vibration of an asynchronous motor as described in embodiment 1 is implemented.
Example 3
The present embodiment is a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the post-processing method of asynchronous motor operation noise and vibration analysis as described in embodiment 1.
The following is the effect reflected by the method and the system of the invention.
Referring to fig. 4, a comparison result of a stator magnetic field rotating speed n1 and a rotor rotating speed n is calculated according to stator structure information in an acceleration process of the asynchronous motor; the acceleration process of the asynchronous motor can be determined, and the stator magnetic field rotating speed n1 is always larger than the rotor rotating speed n.
Referring to fig. 5, according to the acceleration process color calculated according to the stator rotation speed n1, the ratio of the 12 th order 10 of the stator to the stator rotation speed is kept unchanged, and the bending phenomenon of the order along with the offset of the rotor rotation speed and the load disappears.
Referring to fig. 6, the slip calculation result shows that the slip of the acceleration process of the asynchronous motor changes with time.
Therefore, the invention is suitable for post-processing analysis of noise vibration data in the running process of the asynchronous motor, and calculates the rotating speed of the stator magnetic field through post-processing of test data which is acquired by a traditional test method and contains rotating speed information such as the speed of a vehicle, the rotating speed of a half shaft and the like, thereby achieving the purpose of eliminating slip in the test data of the asynchronous motor. The method can accurately extract the main orders of the asynchronous motor, is convenient for searching the characteristic frequency source, and improves the NVH data analysis efficiency and accuracy of the asynchronous motor.
In the foregoing specification, the gist of the present invention has been described by referring to specific embodiments. However, various modifications and changes can be made without departing from the gist of the present invention as set forth in the claims. The drawings described in the present specification are to be regarded as illustrative rather than restrictive. Accordingly, the scope of the gist of the present invention should be determined by the claims and their legal equivalents or entities, not by the examples described only. Any steps set forth in any method or process claims in this specification may be performed in any order or combination of orders and are not limited to the exemplary specific order set forth in the claims.
Claims (10)
1. The post-processing method of the operation noise and vibration data of the asynchronous motor is characterized by comprising the following steps of:
step 1: test data preprocessing: calculating a color chart color of acceleration process data through the rotor rotating speed n of the asynchronous motor to obtain primary edition data with order offset;
step 2: stator order identification: identifying the stator order of a high-rotation-speed section of a rotor of the asynchronous motor according to a slip ratio s= (n 1-n)/n 1 formula of the asynchronous motor, determining the electromagnetic order trend of the stator, selecting specific points of 3-5 high-rotation-speed sections of the order, positioning the low-rotation-speed section order position when calculating the rotation speed of a stator magnetic field according to an order continuity principle, and recording the frequency, time and rotor rotation speed information of the specific points;
step 3: calculating the stator magnetic field rotating speed n1 in a simulation mode: according to the specific points recorded in the rotor rotating speed colourmap, in FFT vs time domain signals of the rotating speed simulation function of the data processing software, according to the recorded frequency, time and rotor rotating speed information of 3-5 high rotating speed specific points, the stator fixed order position is identified, and then the description of the rotating speed simulation points of each rotating speed section is completed through order continuity characteristics, so that the stator magnetic field rotating speed n1 is calculated;
step 4: data synthesis, processing and checking: and (3) deriving data containing the stator magnetic field rotating speed n1, adopting the stator magnetic field rotating speed n1 to recalculate an acceleration process color according to the step (1), checking that the ratio between the 12 th order of the stator and other orders and the stator magnetic field rotating speed is kept unchanged, and the orders disappear along with the offset bending phenomenon of the rotor rotating speed and the load, so that the stator magnetic field rotating speed n1 is successfully calculated.
2. The post-processing method of the operation noise and vibration data of the asynchronous motor according to claim 1, wherein the rotor rotation speed n is calculated according to the total reduction ratio of the speed reducer and the half shaft rotation speed n2.
3. The post-processing method of the running noise and vibration data of the asynchronous motor according to claim 2, wherein the rotation speed of the half shaft is obtained by reading the vehicle speed through a vehicle speed sensor and calculating according to the size of the tire; or directly reading and recording the rotation speed of the half shaft through a photoelectric sensor, or obtaining the rotation speed from a motor rotor signal in CAN information.
4. A method for post-processing of operational noise and vibration data of an asynchronous motor according to any one of claims 1-3, characterized in that said high rotational speed segment refers to a rotor rotational speed of more than 3000 rpm.
5. A method of post-processing asynchronous motor operation noise and vibration data according to any one of claims 1-3, characterized in that the data processing software comprises HEADArtemis, LMS.
6. The post-processing method of the running noise and vibration data of the asynchronous motor according to any one of claims 1 to 3, wherein after the stator magnetic field rotating speed n1 is obtained in the step 4, information that the slip rate changes with time and the vehicle speed changes with needs can be calculated according to the stator magnetic field rotating speed n1 and the rotor rotating speed n.
7. The post-processing method of the running noise and vibration data of the asynchronous motor according to any one of claims 1 to 3, wherein the test data in the step 1 is noise vibration data corresponding to acceleration and deceleration conditions of the whole vehicle obtained by testing and recording in actual road conditions through noise vibration testing equipment, wherein microphones, vibration sensors, vehicle speed or half-shaft rotation speed sensors are arranged at positions where the requirements exist.
8. A method for post-processing operational noise and vibration data of an asynchronous motor according to any one of claims 1-3, wherein said method is applied to vehicles, including electric vehicles, hybrid vehicles, fuel cell vehicles, ordinary internal combustion engine powered vehicles equipped with asynchronous motors.
9. A post-processing system for operation noise and vibration data of an asynchronous motor, comprising a processor and a memory, wherein the memory is stored with a computer program, and the computer program, when executed by the processor, implements the post-processing method for operation noise and vibration data of an asynchronous motor according to any one of claims 1-8.
10. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, realizes the steps of the method for post-processing of operational noise and vibration data of an asynchronous motor according to any of claims 1-8.
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| CN202111446640.1A CN114172435B (en) | 2021-11-30 | 2021-11-30 | Post-processing method, system and computer readable storage medium for operation noise and vibration data of asynchronous motor |
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| CN112906145A (en) * | 2020-12-09 | 2021-06-04 | 华中科技大学 | Motor electromagnetic force and electromagnetic vibration noise analysis method and system |
| CN113489387A (en) * | 2021-07-30 | 2021-10-08 | 东方电气集团东方电机有限公司 | Method for weakening electromagnetic vibration and noise of permanent magnet synchronous motor with specific frequency |
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| CN113489387A (en) * | 2021-07-30 | 2021-10-08 | 东方电气集团东方电机有限公司 | Method for weakening electromagnetic vibration and noise of permanent magnet synchronous motor with specific frequency |
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