CN104833914A - Prediction module and test method for motor vibration characteristics under working state - Google Patents
Prediction module and test method for motor vibration characteristics under working state Download PDFInfo
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- CN104833914A CN104833914A CN201510220344.8A CN201510220344A CN104833914A CN 104833914 A CN104833914 A CN 104833914A CN 201510220344 A CN201510220344 A CN 201510220344A CN 104833914 A CN104833914 A CN 104833914A
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Abstract
The invention relates to a prediction module and test method for motor vibration characteristics under a working state, and relates to the technical field of motor structural acoustics. The prediction method and the test method are especially suitable for predictions and tests of the vibration characteristics of various military and civil large motors under the working state. The invention aims at overcoming shortcomings of a conventional prediction and test method, and provides the prediction module for the motor vibration characteristics under the working state. The prediction module goes through the process according to actual conditions of a motor under the working state, can accurately predict the vibration characteristics of the motor under the working state, and is used for carrying out comprehensive and profound researches on the vibration characteristics of the motor under the working state, so that vibration rules of the motor under the working state can be grasped. The invention also provides the test method for the motor vibration characteristics under the working state, tests can be easily and efficiently carried out through the method, the vibration characteristics of the motor under the working state can be really and efficiently obtained, and the method is used for giving guidance for the vibration characteristic tests of the motor under the actual working state.
Description
Technical field
The present invention relates to motor oscillating Predicting Performance Characteristics module and test method under a kind of duty, belong to electric machine structure technical field of acoustics, be specially adapted to prediction and the test of the vibration characteristics under military, civilian all kinds of large-size machine duty.
Background technology
The control of motor oscillating noise is the important topic that environmental protection faces, and is also the important step improving the motor product at home and abroad market competitiveness, and to obtain motor oscillating characteristic be the gordian technique of carrying out low noise motor design; Due to the complicacy of electric machine structure, especially in working order, its vibration research relate to intersection and the fusion of multiple ambits such as electromagnetics, mechanics and calorifics, and this brings certain challenge also to the research of motor oscillating characteristic; At present, under mainly concentrating on motor component (as support, iron core and stator) or complete machine free state about the large quantity research of motor oscillating characteristic both at home and abroad, the vibration Characteristics of electric machine operation state is not almost set foot in; But, only have grasped motor in working order under vibration characteristics, could the real actual vibration state understanding motor, for motor Low Noise Design provides effective scientific basis;
For the research of the motor oscillating characteristic under duty, its difficulty is to consider the influence factor of electric machine operation state to motor oscillating characteristic how rationally and effectively; In working order, need consider the impact of rotor on stator, its key is to process the matching relationship between rotating shaft and bearing; In addition, the factor that there is considerable influence equally also has the electromagnetic force and temperature rise that produce during machine operation to the impact of motor rigidity; Therefore, the vibration characteristics precision of prediction under electric machine operation state be ensured, need emphasis to think about the effect of above influence factor.
Summary of the invention
The object of the invention is to, overcome defect and the deficiency of existing prediction and test method, the prediction module of motor oscillating characteristic under a kind of duty is provided, for carrying out comprehensive and deep research to the vibration characteristics under electric machine operation state, so grasp motor in working order under vibration regularity; Meanwhile, propose motor oscillating characteristic test method under a kind of duty, be used to guide and test of Vibration is carried out to the motor under actual working state;
Technical scheme of the present invention is to provide the prediction module of vibration characteristics under a kind of electric machine operation state, it is characterized in that, comprising:
One motor modeling unit: build based on entity motor, comprises base, the motor body be arranged on base, and described motor body is fixed with cooling system, and described motor body comprises stator and rotor assembly; Vibration damping air bag is also provided with between motor body and base;
One stress and strain model unit: the stress and strain model achieving motor model, the overall situation adopts hexahedron topological structure to divide, and unit size controls between 5 ~ 20mm, and number of grid reaches 800,000, and ensure that higher mesh quality;
One load applying unit: the electromagnetic force be subject under actual working state for loading motor and temperature rise; The loading of described electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads;
One modal calculation unit: each rank model frequency during for calculating machine operation and the vibration shape;
One Frequency extraction unit: each rank model frequency during for extracting machine operation and the vibration shape.
The prediction module of vibration characteristics under above-mentioned a kind of electric machine operation state, described motor modeling unit carries out orthotropy equivalence to stator core, its role is to simulate more truly the feature that core lamination stack structure has;
Node carries out to the welding between each wallboard of out frame bonding;
Joint portion between each bolts assemblies part is processed according to bolt compresses cone theazy, and considers the effect of bolt pretightening, simulated the effect of bolt pretightening by beam element or preload unit;
Coordinating between rotor with bearing adopts bar unit to simulate according to the quantity of bearing roller, and certain radial rigidity and axial rigidity are set, wherein radial rigidity can be arranged according to the material of rolling body and sectional dimension, and whether axial rigidity is suitably arranged according to there is back-up ring and whether bear certain axial force.
The prediction module of vibration characteristics under above-mentioned a kind of electric machine operation state, the electromagnetic force be subject under achieving motor actual working state and temperature rise load; The loading of electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads.
Motor oscillating characteristic test method under a kind of duty, is characterized in that, comprise the following steps:
Step 1: tested motor is arranged on cast iron platform, and adopt vibration damping air bag to carry out elasticity installation;
Step 2: switch on power and carry out motor commissioning test, shut down power-off after normal operation;
Step 3: arrange acceleration transducer, major motor housing and external face are arranged, on housing, each measuring point distributes by 30 × 30cm rectangular array, and on end cap, each measuring point is according to the concentric circles of different diameters 20cm, and circumferencial direction arranges a measuring point every 22.5 °;
Step 4: connecting test equipment, is connected to number and adopts on equipment by sensor signal lines, be connected by the data line that number adopts equipment, start power supply with PC;
Step 5: open mould measurement software, whether the signal detecting each sensor is normal, and arranges acquisition parameter;
Step 6: reclose motor power, by frequency converter starter motor, under making motor speed steadily rise to rated speed, meanwhile, gathers the response signal of each acceleration transducer in whole process, and the real-time rotate speed of synchronous acquisition motor;
Step 7: motor stopping, each rank model frequency by the operational modal analysis Module recognition in mould measurement software and when extracting machine operation and the vibration shape;
Step 8: the rationality passing judgment on the mode identified according to modal assurance criterion, if checking rationally, then disconnects testing apparatus and motor power, terminates test, if verify unreasonable, then repeats step 6, Resurvey and identification.
Advantage of the present invention there are provided the prediction module of vibration characteristics under a kind of electric machine operation state, and method is simply effective, considers comprehensively, can go out vibration characteristics under electric machine operation state by Accurate Prediction; The test method that the present invention proposes, implementation process is simply efficient, and can obtain the vibration characteristics under electric machine operation state authentic and validly.
Accompanying drawing explanation
Fig. 1 is the motor model in prediction module of the present invention;
Fig. 2 is the acceleration transducer arrangement in test procedure of the present invention on motor housing;
Fig. 3 is the acceleration transducer arrangement in test procedure of the present invention on electric motor end cap.
Embodiment
With certain large-size machine duty for embodiment, and the invention will be further described by reference to the accompanying drawings:
One, hardware configuration.
As shown in Figure 1, prediction module of the present invention comprises:
One motor modeling unit: build based on entity motor, motor model is assembled primarily of parts such as cooling system 1.1, stator 1.2, rotor 1.3, base 1.4 and vibration damping air bags 1.5;
As shown in Figure 2, in the test of Vibration under electric machine operation state of the present invention, acceleration transducer 2.1 is arranged on motor housing 2.2, and distributes by 30 × 30cm rectangular array;
As shown in Figure 3, in the test of Vibration under electric machine operation state of the present invention, acceleration transducer 3.1 is arranged on electric motor end cap 3.2, and according to the concentric circles of different diameters 20cm, and circumferencial direction arranges a measuring point every 22.5 °.
One stress and strain model unit: the stress and strain model achieving motor model, the overall situation adopts hexahedron topological structure to divide, and unit size controls between 5 ~ 20mm, and number of grid reaches 800,000, and ensure that higher mesh quality;
One load applying unit: the electromagnetic force be subject under actual working state for loading motor and temperature rise; The loading of described electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads;
One modal calculation unit: each rank model frequency during for calculating machine operation and the vibration shape;
One Frequency extraction unit: each rank model frequency during for extracting machine operation and the vibration shape.
Wherein, motor modeling unit carries out orthotropy equivalence to stator core, its role is to simulate more truly the feature that core lamination stack structure has;
Node carries out to the welding between each wallboard of out frame bonding;
Joint portion between each bolts assemblies part is processed according to bolt compresses cone theazy, and considers the effect of bolt pretightening, simulated the effect of bolt pretightening by beam element or preload unit;
Coordinating between rotor with bearing adopts bar unit to simulate according to the quantity of bearing roller, and certain radial rigidity and axial rigidity are set, wherein radial rigidity can be arranged according to the material of rolling body and sectional dimension, and whether axial rigidity is suitably arranged according to there is back-up ring and whether bear certain axial force.
The electromagnetic force that prediction module is subject under achieving motor actual working state and temperature rise load; The loading of electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads.
Two, during experiment, comprise the following steps:
Step 1: tested motor is arranged on cast iron platform, and adopt vibration damping air bag to carry out elasticity installation;
Step 2: switch on power and carry out motor commissioning test, shut down power-off after normal operation;
Step 3: arrange acceleration transducer, major motor housing and external face are arranged, on housing, each measuring point distributes by 30 × 30cm rectangular array, and on end cap, each measuring point is according to the concentric circles of different diameters 20cm, and circumferencial direction arranges a measuring point every 22.5 °;
Step 4: connecting test equipment, is connected to number and adopts on equipment by sensor signal lines, be connected by the data line that number adopts equipment, start power supply with PC;
Step 5: open mould measurement software, whether the signal detecting each sensor is normal, and arranges acquisition parameter;
Step 6: reclose motor power, by frequency converter starter motor, under making motor speed steadily rise to rated speed, meanwhile, gathers the response signal of each acceleration transducer in whole process, and the real-time rotate speed of synchronous acquisition motor;
Step 7: motor stopping, each rank model frequency by the operational modal analysis Module recognition in mould measurement software and when extracting machine operation and the vibration shape;
Step 8: the rationality passing judgment on the mode identified according to modal assurance criterion, if checking rationally, then disconnects testing apparatus and motor power, terminates test, if verify unreasonable, then repeats step 6, Resurvey and identification.
Above-describedly be only preferred embodiment of the present invention, limitation of the present invention is not described, all protection scope of the present invention should be considered as with test for the vibration characteristics prediction under any electric machine operation state.
Claims (4)
1. the prediction module of vibration characteristics under electric machine operation state, is characterized in that, comprise
One motor modeling unit: build based on entity motor, comprise base (1.4), the motor body be arranged on base (1.4), described motor body is fixed with cooling system (1.1), described motor body comprises stator (1.2) and rotor (1.3) assembly; Vibration damping air bag (1.5) is also provided with between motor body and base (1.4);
One stress and strain model unit: the stress and strain model achieving motor model, the overall situation adopts hexahedron topological structure to divide, and unit size controls between 5 ~ 20mm, and number of grid reaches 800,000, and ensure that higher mesh quality;
One load applying unit: the electromagnetic force be subject under actual working state for loading motor and temperature rise; The loading of described electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads;
One modal calculation unit: each rank model frequency during for calculating machine operation and the vibration shape;
One Frequency extraction unit: each rank model frequency during for extracting machine operation and the vibration shape.
2. the prediction module of vibration characteristics under a kind of electric machine operation state according to claim 1, it is characterized in that, described motor modeling unit carries out orthotropy equivalence to stator core, its role is to simulate more truly the feature that core lamination stack structure has;
Node carries out to the welding between each wallboard of out frame bonding;
Joint portion between each bolts assemblies part is processed according to bolt compresses cone theazy, and considers the effect of bolt pretightening, simulated the effect of bolt pretightening by beam element or preload unit;
Coordinating between rotor with bearing adopts bar unit to simulate according to the quantity of bearing roller, and certain radial rigidity and axial rigidity are set, wherein radial rigidity can be arranged according to the material of rolling body and sectional dimension, and whether axial rigidity is suitably arranged according to there is back-up ring and whether bear certain axial force.
3. the prediction module of vibration characteristics under a kind of electric machine operation state according to claim 1, is characterized in that, the electromagnetic force be subject under described load applying unit achieves motor actual working state and temperature rise load; The loading of electromagnetic force is that the actual electrical magnetic force size that is subject to according to stator core under electric machine operation state and distribution form load, and it is load according to the stable temperature rise produced after machine operation that temperature rise loads.
4. a motor oscillating characteristic test method under duty, is characterized in that, comprise the following steps:
Step 1: tested motor is arranged on cast iron platform, and adopt vibration damping air bag to carry out elasticity installation;
Step 2: switch on power and carry out motor commissioning test, shut down power-off after normal operation;
Step 3: arrange acceleration transducer, major motor housing and external face are arranged, on housing, each measuring point distributes by 30 × 30cm rectangular array, and on end cap, each measuring point is according to the concentric circles of different diameters 20cm, and circumferencial direction arranges a measuring point every 22.5 °;
Step 4: connecting test equipment, is connected to number and adopts on equipment by sensor signal lines, be connected by the data line that number adopts equipment, start power supply with PC;
Step 5: open mould measurement software, whether the signal detecting each sensor is normal, and arranges acquisition parameter;
Step 6: reclose motor power, by frequency converter starter motor, under making motor speed steadily rise to rated speed, meanwhile, gathers the response signal of each acceleration transducer in whole process, and the real-time rotate speed of synchronous acquisition motor;
Step 7: motor stopping, each rank model frequency by the operational modal analysis Module recognition in mould measurement software and when extracting machine operation and the vibration shape;
Step 8: the rationality passing judgment on the mode identified according to modal assurance criterion, if checking rationally, then disconnects testing apparatus and motor power, terminates test, if verify unreasonable, then repeats step 6, Resurvey and identification.
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Cited By (5)
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| CN105574341A (en) * | 2015-12-17 | 2016-05-11 | 西安交通大学 | Method for calculating normal-temperature pre-tightening force of bolt working under low-temperature working condition |
| CN106940735A (en) * | 2016-10-19 | 2017-07-11 | 天津大学 | A kind of induction machine elastic vibration stability prediction method |
| CN107246948A (en) * | 2017-07-11 | 2017-10-13 | 哈尔滨工程大学 | A kind of detection means and method of motor oscillating characteristic frequency |
| CN110045282A (en) * | 2019-04-24 | 2019-07-23 | 安徽皖南新维电机有限公司 | A kind of permanent-magnet synchronous reluctance motor experimental rig and its test method |
| CN113109710A (en) * | 2021-04-14 | 2021-07-13 | 深圳迪巨智能科技有限公司 | Analog motor debugging device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105574341A (en) * | 2015-12-17 | 2016-05-11 | 西安交通大学 | Method for calculating normal-temperature pre-tightening force of bolt working under low-temperature working condition |
| CN105574341B (en) * | 2015-12-17 | 2018-04-17 | 西安交通大学 | A kind of bolt room temperature pretightning force computational methods to work under worst cold case |
| CN106940735A (en) * | 2016-10-19 | 2017-07-11 | 天津大学 | A kind of induction machine elastic vibration stability prediction method |
| CN107246948A (en) * | 2017-07-11 | 2017-10-13 | 哈尔滨工程大学 | A kind of detection means and method of motor oscillating characteristic frequency |
| CN107246948B (en) * | 2017-07-11 | 2019-04-12 | 哈尔滨工程大学 | A kind of detection device and method of motor oscillating characteristic frequency |
| CN110045282A (en) * | 2019-04-24 | 2019-07-23 | 安徽皖南新维电机有限公司 | A kind of permanent-magnet synchronous reluctance motor experimental rig and its test method |
| CN110045282B (en) * | 2019-04-24 | 2021-11-02 | 安徽皖南新维电机有限公司 | Permanent magnet synchronous reluctance motor test device and test method thereof |
| CN113109710A (en) * | 2021-04-14 | 2021-07-13 | 深圳迪巨智能科技有限公司 | Analog motor debugging device |
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