CN104849004A - Motor electromagnetic excitation load identification method - Google Patents
Motor electromagnetic excitation load identification method Download PDFInfo
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- CN104849004A CN104849004A CN201510227635.XA CN201510227635A CN104849004A CN 104849004 A CN104849004 A CN 104849004A CN 201510227635 A CN201510227635 A CN 201510227635A CN 104849004 A CN104849004 A CN 104849004A
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Abstract
The invention relates to a motor electromagnetic excitation load identification method and belongs to the motor structure acoustic design field. The motor electromagnetic excitation load identification method is suitable for identification and frequency characteristic analysis of electromagnetic excitation load in motor structure acoustic design. The method includes the steps of electromagnetic excitation load equivalence method determination, measurement point arrangement, transfer function testing, working condition response testing and load identification. With the motor electromagnetic excitation load identification method of the invention adopted, the accuracy of motor electromagnetic excitation load identification can be improved, and test installation difficulty of a traditional indirect test method can be eliminated, and a characteristic that an electromagnetic excitation force is distributed with time and space is considered, and equivalence calculation and frequency characteristic analysis of the motor electromagnetic excitation load can be realized, and motor structure acoustic design can be guided. The motor electromagnetic excitation load identification method is simple in test installation.
Description
Technical field
The present invention relates to a kind of recognition methods of motor electromagnetic Vibrating Load, belong to electric machine structure acoustic design field, be applicable to the identification of electromagnetic exciting load in electric machine structure acoustic design and frequency-response analysis and may be used for the simulation calculation of electric machine structure vibration.
Background technology
For motor, due to the interaction of air-gap field, rotor produces in time with the electro-magnetic exciting force of spatial variations, if some model frequency of electro-magnetic exciting force frequency and electric machine structure is close, generation is resonated, thus causing the obvious increase of motor oscillating noise, this just needs the frequency characteristic studying electro-magnetic exciting force.Because the electro-magnetic exciting force on motor stator changes with space (stator shaft orientation and circumferential position) in time, increase the measurement difficulty of electro-magnetic exciting force, the surveyed parameter relevant to motor electromagnetic exciting force therefore can only be utilized to carry out indirect inspection.The indirect method of measurement mainly contains two kinds, one arranges inductive coil on motor stator tooth, measures magnetic signature by the change of magnetic flux on inductive coil, but owing to being arranged on whole tooth, measuring what obtain is the mean value of whole tooth, is difficult to the axial distribution reflecting magnetic field; Another kind is directly installed in the air gap between motor stator and rotor by very thin Hall effect sensor, but because Hall sensor has certain thickness, this will affect the air gap between rotor and make measurement inaccurate, and often need to arrange in limited air gap the Hall sensor of a greater number to measure axial and circumferential distribution, increase is also tested installation difficulty and is produced certain potential safety hazard by this.Consider the deficiency that above-mentioned method of testing exists, matrix inversion method can be adopted to carry out the identification of electromagnetic exciting load, and the generalized inverse of power-acceleration matrix that the method is multiplied by between constrained input end by the output terminal response under motor operating condition identifies the Vibrating Load of input end.
Summary of the invention
The object of the invention is to, overcome the deficiency of traditional indirect test method, a kind of accuracy that can improve the identification of motor electromagnetic Vibrating Load is provided, overcome the test installation difficulty of traditional indirect test method, realize Equivalent Calculation and the frequency-response analysis of motor electromagnetic Vibrating Load, instruct electric machine structure acoustic design, be consider electro-magnetic exciting force in time with the distribution character in space, the recognition methods of simple motor electromagnetic Vibrating Load is installed in test.
Technical scheme of the present invention is:
A recognition methods for motor electromagnetic Vibrating Load, is characterized in that, step comprises:
Step 1, determines the equivalent method of electromagnetic exciting load: the exciting force being evenly equivalent to three cross sections on stator shaft orientation, and the circumference in each cross section is evenly equivalent to eight exciting forces, amounts to 24 exciting forces.24 exciting forces of equivalence all have with actual exciting force the effect making structure produce identical vibratory response, and this equivalent exciting force may be used for the loading of simulation excitation;
Step 2, point layout: the equivalent excitation point determining motor electromagnetic exciting source, the axial and circumferential namely along stator core inwall are evenly arranged, and axially evenly choose three cross sections, the circumference in each cross section evenly chooses eight point of excitation, and according to the number of point of excitation determination reference point and position; The number of reference point is more than 2 times of point of excitation number, to meet the mathematic(al) manipulation requirement in matrix inversion process;
Step 3, transport function is tested: remove the rotor as driving link, utilize transport function proving installation, test and excitation point is to the transport function of reference point;
Step 4, operating mode response test: under declared working condition, utilizes operating mode response test device, carries out the vibration acceleration response test of reference point;
Step 5, load identification: adopt matrix inversion technique
assumed (specified) load, namely point of excitation is to the inverse matrix of the transfer function matrix of reference point
respond with the operating mode of reference point
be multiplied acquisition.
Further technical scheme is:
In the recognition methods of above-mentioned a kind of motor electromagnetic Vibrating Load, be based on hammering method in described step 3 and utilize transport function proving installation test and excitation point to the transport function of reference point, described transport function proving installation comprises power hammer, acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point, power hammer knocks point of excitation to produce wideband pulse excitation force signal, power is hammered into shape, acceleration transducer is connected with PC by data acquisition front, the data that data acquisition front will gather are: power hammer knocks the exciting force signal that point of excitation produces, the vibration acceleration response signal of reference point, and be the transport function of point of excitation to reference point through PC data processing.
In the recognition methods of above-mentioned a kind of motor electromagnetic Vibrating Load, in described step 4, operating mode response test utilizes operating mode response test device, the operating mode response of test reference point, described operating mode response test device comprises acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point, acceleration transducer is connected with PC by data acquisition front, and the data that data acquisition front will gather are: the vibration acceleration response of reference point under operating mode.
In the recognition methods of above-mentioned a kind of motor electromagnetic Vibrating Load, inversefouriertransform is carried out for the electromagnetic exciting load on frequency domain, the temporal signatures of electromagnetic exciting load can be obtained.
accompanying drawing illustrates:
Fig. 1 is along three evenly equivalent cross sections of stator shaft orientation;
Fig. 2 is the point of excitation along the even equivalent hammering of stator circumference;
Fig. 3 is that the reference point on stator core is arranged;
Fig. 4 is the transport function test pattern under rotor condition removed by motor;
Fig. 5 is the operating mode response test figure of reference point under Rated motor working condition running state;
Fig. 6 is the schematic diagram that load identification calculates.
In figure: 1-close on the cross section of anti-drive end; 2-central cross-section; The cross section of 3-adjacent driving end; 4-stator core; 5-outer wall unshakable in one's determination; 6-inwall unshakable in one's determination; 7-point of excitation; 8-reference point; 9-power is hammered into shape.
Embodiment
The invention will be further described in conjunction with the accompanying drawings and embodiments:
embodiment 1:it is a basic embodiment.A recognition methods for motor electromagnetic Vibrating Load, step is:
Step 1, determines the equivalent method of electromagnetic exciting load: the exciting force being evenly equivalent to three cross sections on stator shaft orientation, and the circumference in each cross section is evenly equivalent to eight exciting forces, amounts to 24 exciting forces; 24 exciting forces of equivalence all have with actual exciting force the effect making structure produce identical vibratory response, and this equivalent exciting force may be used for the loading of simulation excitation; Described three cross sections are: the cross section 1 closing on anti-drive end, the cross section 3 of central cross-section 2 and adjacent driving end;
Step 2, point layout: the equivalent excitation point 7 determining motor electromagnetic exciting source, the axial and circumferential namely along stator core inwall are evenly arranged, and axially evenly choose three cross sections, the circumference in each cross section evenly chooses eight point of excitation 7, and determines number and the position of reference point 8 according to point of excitation 7; The number of reference point 8 is more than 2 times of point of excitation 7 number, to meet the mathematic(al) manipulation requirement in matrix inversion process;
Step 3, transport function is tested: remove the rotor as driving link, utilize transport function proving installation, the transport function of test and excitation point 7 to reference point 8;
Step 4, operating mode response test: under declared working condition, utilizes operating mode response test device, carries out the vibration acceleration response test of reference point 8;
Step 5, load identification: adopt matrix inversion technique
assumed (specified) load, the i.e. inverse matrix of the transfer function matrix of point of excitation 7 to reference point 8
respond with the operating mode of reference point 8
be multiplied acquisition.
embodiment 2:further embodiment: be based on hammering method in described step 3 and utilize the transport function of transport function proving installation test and excitation point 7 to reference point 8, described transport function proving installation comprises power hammer 9, acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point 8, power hammer 9 knocks point of excitation 7 to produce wideband pulse excitation force signal, power is hammered into shape, acceleration transducer is connected with PC by data acquisition front, the data that data acquisition front will gather are: power hammer 9 knocks the exciting force signal that point of excitation 7 produces, the vibration acceleration response signal of reference point 8, and be the transport function of point of excitation 7 to reference point 8 through PC data processing.
In described step 4, operating mode response test utilizes operating mode response test device, the operating mode response of test reference point 8; Described operating mode response test device comprises acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point 8, acceleration transducer is connected with PC by data acquisition front, and the data that data acquisition front will gather are: the vibration acceleration response of reference point 8 under operating mode.
Inversefouriertransform is carried out for the electromagnetic exciting load on frequency domain, the temporal signatures of electromagnetic exciting load can be obtained.
embodiment 3:it is a preferred embodiment.With certain large-size machine for embodiment, and the invention will be further described by reference to the accompanying drawings:
Main flow comprises: determine that the layout of the equivalent excitation point 7 in electromagnetic exciting source, reference point 8, motor remove operating mode response test, the identification of electromagnetic exciting load of reference point 8 under transport function test under rotor condition, Rated motor working condition running state.Specific as follows:
1, determine the equivalent excitation point in electromagnetic exciting source: certain large-size machine, its electromagnetic exciting source is mainly air-gap field and acts on radial electromagnetic force on stator core inside surface, according to the statistical property of radial electromagnetic force on Time and place (stator shaft orientation and circumferential position), can radial electromagnetic force be reduced to along stator shaft orientation and the equally distributed equivalent concentrated force of circumference in the distribution of stator core inside surface, namely on stator shaft orientation, be evenly equivalent to three cross sections (be respectively: the cross section 1 closing on anti-drive end, central cross-section 2, the cross section 3 of adjacent driving end) exciting force (Fig. 1), and the circumference in each cross section is evenly equivalent to eight point of excitation (Fig. 2), amount to 24 point of excitation.The exciting force of 24 point of excitation 7 of equivalence all has with actual exciting force the effect making structure produce identical vibratory response, and this equivalent exciting force may be used for the loading of simulation excitation.
2, the layout of reference point: according to position and the number of point of excitation, determines layout and the number of reference point 8; For 24 equivalent excitation power, the reference point of more than 2 times point of excitation numbers need be arranged, i.e. the reference point 8 of more than 48 numbers, and reference point 8 too closely too far, can not can not can be evenly arranged (Fig. 3) at stator core outside surface apart from point of excitation 7.
3, transport function test: remove the rotor as driving link, utilize transport function proving installation (Fig. 4), the transport function of test and excitation point 7 to reference point 8;
4, operating mode response test: under declared working condition running status, utilizes operating mode response test device (Fig. 5), the operating mode response of test reference point 8;
5, Vibrating Load identification: the test data of transport function and operating mode response is imported load identification computing system (Fig. 6), based on matrix inversion principle, and the singularity value decomposition of associate(d) matrix solves the ill-conditioning problem of matrix inversion, and then utilize the inverse matrix of transfer function matrix of point of excitation 7 to reference point 8
respond with the operating mode of reference point 8
be multiplied and obtain electromagnetic exciting load.
Above-describedly be only preferred embodiment of the present invention, limitation of the present invention is not described, any thought of matrix inversion that utilizes is known to method for distinguishing all should be considered as protection scope of the present invention to be carried out motor electromagnetic Vibrating Load.
Claims (4)
1. a recognition methods for motor electromagnetic Vibrating Load, is characterized in that, step comprises:
Step 1, determines the equivalent method of electromagnetic exciting load: the exciting force being evenly equivalent to three cross sections on stator shaft orientation, and the circumference in each cross section is evenly equivalent to eight exciting forces, amounts to 24 exciting forces; 24 exciting forces of equivalence all have with actual exciting force the effect making structure produce identical vibratory response, and this equivalent exciting force may be used for the loading of simulation excitation;
Step 2, point layout: the equivalent excitation point determining motor electromagnetic exciting source, the axial and circumferential namely along stator core inwall are evenly arranged, and axially evenly choose three cross sections, the circumference in each cross section evenly chooses eight point of excitation, and according to the number of point of excitation determination reference point and position; The number of reference point is more than 2 times of point of excitation number, to meet the mathematic(al) manipulation requirement in matrix inversion process;
Step 3, transport function is tested: remove the rotor as driving link, utilize transport function proving installation, test and excitation point is to the transport function of reference point;
Step 4, operating mode response test: under declared working condition, utilizes operating mode response test device, carries out the vibration acceleration response test of reference point;
Step 5, load identification: adopt matrix inversion technique
assumed (specified) load, namely point of excitation is to the inverse matrix of the transfer function matrix of reference point
respond with the operating mode of reference point
be multiplied acquisition.
2. the recognition methods of a kind of motor electromagnetic Vibrating Load according to claim 1, it is characterized in that, be based on hammering method in described step 3 and utilize transport function proving installation test and excitation point to the transport function of reference point, described transport function proving installation comprises power hammer, acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point, power hammer knocks point of excitation to produce wideband pulse excitation force signal, power is hammered into shape, acceleration transducer is connected with PC by data acquisition front, the data that data acquisition front will gather are: power hammer knocks the exciting force signal that point of excitation produces, the vibration acceleration response signal of reference point, and be the transport function of point of excitation to reference point through PC data processing.
3. the recognition methods of a kind of motor electromagnetic Vibrating Load according to claim 1, is characterized in that, in described step 4, operating mode response test utilizes operating mode response test device, the operating mode response of test reference point; Described operating mode response test device comprises acceleration transducer, data acquisition front, PC, degree of will speed up sensor is arranged in reference point, acceleration transducer is connected with PC by data acquisition front, and the data that data acquisition front will gather are: the vibration acceleration response of reference point under operating mode.
4. the recognition methods of a kind of motor electromagnetic Vibrating Load according to claim 1, is characterized in that, carries out inversefouriertransform, can obtain the temporal signatures of electromagnetic exciting load for the electromagnetic exciting load on frequency domain.
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Cited By (5)
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| CN110411757A (en) * | 2019-07-30 | 2019-11-05 | 安徽江淮汽车集团股份有限公司 | Spindle nose dynamic load calculation method, device, equipment and storage medium |
| CN110579412A (en) * | 2019-09-10 | 2019-12-17 | 重庆大学 | method for laying stability detection positions of fan foundations of highway tunnel |
| CN113405787A (en) * | 2021-05-28 | 2021-09-17 | 上海电机学院 | Mechanical admittance testing method and device for motor stator system |
| CN113405711A (en) * | 2021-05-28 | 2021-09-17 | 上海电机学院 | Motor operation condition force testing method and device |
| CN114485920A (en) * | 2022-01-24 | 2022-05-13 | 广东汇天航空航天科技有限公司 | Control information generation method and device, electronic equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110411757A (en) * | 2019-07-30 | 2019-11-05 | 安徽江淮汽车集团股份有限公司 | Spindle nose dynamic load calculation method, device, equipment and storage medium |
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| CN113405787B (en) * | 2021-05-28 | 2023-11-10 | 上海电机学院 | Motor stator system mechanical admittance testing method and device |
| CN114485920A (en) * | 2022-01-24 | 2022-05-13 | 广东汇天航空航天科技有限公司 | Control information generation method and device, electronic equipment and medium |
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