CN103886206A - Method and system for analyzing influence of joints on shaft voltage of power generator - Google Patents
Method and system for analyzing influence of joints on shaft voltage of power generator Download PDFInfo
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- CN103886206A CN103886206A CN201410114953.0A CN201410114953A CN103886206A CN 103886206 A CN103886206 A CN 103886206A CN 201410114953 A CN201410114953 A CN 201410114953A CN 103886206 A CN103886206 A CN 103886206A
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Abstract
The invention discloses a method and system for analyzing the influence of joints on the shaft voltage of a power generator. The method includes the following steps that a power generator model with non-split-joint laminated pieces of a stator core is established; material attributes of all the parts are set; a plane coordinate system is established for each rotor magnetic pole; the power generator model is evenly divided into two parts, the two parts of the power generator model are moved relative to each other for a preset distance, Boolean calculation is performed on the joint on one side so that the joint can be expanded to a second preset distance, and thus uneven joints are formed in the positions with the difference of 180 degrees; the power generator model with the joints is subjected to adaptive mesh generation; simulation is performed through the model, and the relation between the joints and the shaft voltage of the power generator is analyzed. Through the method and system, the influence of the joints of the laminated pieces of the stator core on the distribution of the magnetic flux of a motor can be analyzed, distribution changes of the magnetic field caused by uneven joints of the laminated pieces of the motor can be dynamically analyzed easily, and thus the shaft voltage is inducted on a rotary shaft, and the accuracy degree of analyzing and researching the shaft voltage is improved.
Description
Technical field
The present invention relates to generator, the especially a kind of method and system of seam to generator shaft voltage influence of analyzing.
Background technology
Follow the widespread use of self-excitation Thyristor Excitation System, turbodynamo has increased a kind of sizable high frequency shaft voltage source, and the analysis of shaft voltage problem, the problem of protection become more complicated.Existing analytical approach comprises: adopt the Kirchhoff's law of magnetic circuit to analyze; Or, the impact on shaft voltage in conjunction with lamination seam quantity and motor number of pole-pairs ratio, adopt formula 2k/p to analyze: when 2k/p(k represents stator core video disc seam number, P represents number of magnetic poles) after reduction of a fraction abbreviation, molecule is odd number, produce shaft voltage, molecule is that even number does not produce shaft voltage, and this rule is extensively quoted in follow-up study.
But, owing to there will be relevant issues in installation, operational process, motor lamination gaping of joints can not be identical, be easy to occur the problem of non-uniform of lamination seam, cause the asymmetric of magnetic circuit reluctance, cause that Distribution of Magnetic Field changes, along with rotor rotates, this Distribution of Magnetic Field presents again periodically alternately, rotor often turns over one week and repeats once, the periodicity alternation of Distribution of Magnetic Field is inductive axis voltage in rotating shaft further, therefore between lamination seam one magnetic field one shaft voltage three, exists indivisible contact.
And prior art cannot dynamically, accurately be analyzed the impact that inhomogeneous seam causes shaft voltage.
Summary of the invention
Goal of the invention: provide a kind of method and system of seam to generator shaft voltage influence of analyzing, to solve the problems referred to above of prior art.
Technical scheme: a kind of method of seam to generator shaft voltage influence of analyzing, comprises the steps:
S1, set up the not generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, and described stator model is made up of stator core and stator winding, and described rotator model is made up of rotor core and rotor magnetic pole;
S2, the material properties of each part mentioned above is set;
S3, each rotor magnetic pole is set up to areal coordinate system;
S4, the stator core of described generator model is divided into two halves and the preset distance that relatively moves, the seam of a side is done to Boolean calculation, make gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °;
S5, above-mentioned jointed generator model is carried out to ad aptive mesh octatree;
S6, utilize above-mentioned model to carry out emulation, analyze the relation of inhomogeneous seam and generator shaft voltage.
Described S3 is further: the initial point of selecting the arbitrary focusing in rotor magnetic pole plane as areal coordinate to be, the direction of definite X-axis behind seizure one summit.
Described emulation in step S6 comprises: electrostatic field emulation, static magnetic field emulation, time-varying electric field emulation, time-varying magnetic field emulation, vortex field emulation, transient field emulation and Temperature Field Simulation.
A kind of system of seam to generator shaft voltage influence of analyzing, comprise, for setting up the not module of the generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, described stator model is made up of stator core and stator winding, and described rotator model is made up of rotor core and rotor magnetic pole;
Be used for the module of the material properties that each part mentioned above is set; For each rotor magnetic pole being set up to the module of areal coordinate system; For generating the module of seam, this module is for being divided into two halves and the preset distance that relatively moves by the stator core of described generator model, seam to a side is done Boolean calculation, makes gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °; For above-mentioned jointed generator model being carried out to the module of ad aptive mesh octatree; Be used for utilizing above-mentioned model to carry out emulation, to analyze the module of relation of inhomogeneous seam and generator shaft voltage.
Beneficial effect: the present invention can analyze the distribution influence of stator-core lamination seam to motor magnetic flux, contributing to dynamically to analyze the inhomogeneous Distribution of Magnetic Field that causes of motor lamination seam changes, and then in rotating shaft the phenomenon of inductive axis voltage, improved the levels of precision of analysis and research shaft voltages.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Embodiment
The present invention analyzes seam the method for generator shaft voltage influence is mainly comprised the steps:
S1, set up the not generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, and described stator model is made up of stator core and stator winding, and described rotator model is made up of rotor core and rotor magnetic pole.
S2, the material properties of each part mentioned above is set.
S3, each rotor magnetic pole is set up to areal coordinate system; The initial point of selecting the arbitrary focusing in rotor magnetic pole plane as areal coordinate to be, the direction of definite X-axis behind seizure one summit.
S4, the stator core of described generator model is divided into two halves and the preset distance that relatively moves, the seam of a side is done to Boolean calculation, make gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °.
S5, above-mentioned jointed generator model is carried out to ad aptive mesh octatree.
S6, utilize above-mentioned model to carry out emulation, analyze the relation of seam and generator shaft voltage; Comprise: electrostatic field emulation, static magnetic field emulation, time-varying electric field emulation, time-varying magnetic field emulation, vortex field emulation, transient field emulation and Temperature Field Simulation; Can be used for the characteristic of static state, stable state, transient state, nominal situation and the fault condition of analyzing the calutrons such as motor, sensor, transformer, permanent magnetism equipment, driver by above-mentioned emulation.
Analysis seam of the present invention mainly comprises the system of generator shaft voltage influence: for setting up the not module of the generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, described stator model is made up of stator core and stator winding, and rotator model is made up of rotor core and rotor magnetic pole;
Be used for the module of the material properties that each part mentioned above is set; For each rotor magnetic pole being set up to the module of areal coordinate system; For generating the module of seam, this module is for being divided into two halves and the preset distance that relatively moves by described generator model, seam to a side is done Boolean calculation, makes gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °; For above-mentioned jointed generator model being carried out to the module of ad aptive mesh octatree;
Be used for utilizing above-mentioned model to carry out emulation, to analyze the module of relation of inhomogeneous seam and generator shaft voltage.
Adopt the generator model of said method and system made to comprise air gap 5 and the border 6 between stator core 1, stator winding 2, rotor core 3, rotor magnetic pole 4, stator and rotor.Seam 7 between stator core 1, stator winding 2 and stator core forms stator.The air gap of lamination seam crossing is infinitely narrow, by Boolean calculation, stator core is separated and move down 0.5mm along X-axis is symmetrical, then the right seam is done to boolean's intersection operation is extended to 1mm; Rotor core 3 and rotor magnetic pole 4 form rotor; Air gap 5 between stator and rotor is infinitely small, and generator is in 6 scopes of border.The material properties on stator core 1, stator winding 2, rotor core 3, rotor magnetic pole 4 and border 6 finds corresponding material according to the material requirements of every part, add corresponding attribute, for example BH curve, the new material of the creation such as the density of silicon steel material, to meet the demands, makes result accurate as far as possible.
Because rotor magnetic pole 4 is rotating, in the time that it rotates, the rotation thereupon of areal coordinate system, so that carry out performance analysis to model.With areal coordinate system, each permanent magnet being carried out to directed detailed process is: the initial point of choosing the arbitrary focusing in rotor magnetic pole plane as areal coordinate to be, the direction of definite X-axis behind another summit of capture surface.Each rotor magnetic pole does such operation.By the present invention, can more intuitively find out that stator-core lamination seam has produced impact to the Distribution of Magnetic Field of motor, there is the bright situation that obvious variation occurs of distribution of fracture in the magnetic line of force especially at rotor core place seam crossing.
The different mechanism that produce for shaft voltage, can take corresponding innovative approach, as: strengthen the sealing between steam turbine and generator; The static charge that prevents steam leakage and gather on axle; For the asymmetric shaft voltage causing of magnetic circuit, when design, should avoid all asymmetric, in assembling, avoid eccentric; The shaft voltage causing for axial magnetic flux, need demagnetize to magnetized part, and the material of certain thickness low magnetic property etc. is set on all possible flux path.
In a word, the present invention has that model structure is simple, cost is low, functional, there is certain precision, be convenient to the advantages such as realization.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
Claims (4)
1. analyze the method for seam to generator shaft voltage influence, it is characterized in that, comprise the steps:
S1, set up the not generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, and described stator model is made up of stator core and stator winding, and described rotator model is made up of rotor core and rotor magnetic pole;
S2, the material properties of each part mentioned above is set;
S3, each rotor magnetic pole is set up to areal coordinate system;
S4, the stator core of described generator model is divided into two halves and the preset distance that relatively moves, the seam of a side is done to Boolean calculation, make gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °;
S5, above-mentioned jointed generator model is carried out to ad aptive mesh octatree; ;
S6, utilize above-mentioned model to carry out emulation, analyze the relation of inhomogeneous seam and generator shaft voltage.
2. the method for analysis seam as claimed in claim 1 to generator shaft voltage influence, is characterized in that, described S3 is further: the initial point of selecting the arbitrary focusing in rotor magnetic pole plane as areal coordinate to be, the direction of definite X-axis behind seizure one summit.
3. the method for analysis seam as claimed in claim 1 or 2 to generator shaft voltage influence, it is characterized in that, the described emulation in step S6 comprises: electrostatic field emulation, static magnetic field emulation, time-varying electric field emulation, time-varying magnetic field emulation, vortex field emulation, transient field emulation and Temperature Field Simulation.
4. analyze the system of seam to generator shaft voltage influence, it is characterized in that, comprise
For setting up the not module of the generator model of parting of stator-core lamination, this generator model comprises rotator model and stator model, and described stator model is by forming containing stator core and stator winding, and described rotator model is made up of rotor core and rotor magnetic pole;
Be used for the module of the material properties that each part mentioned above is set;
For each rotor magnetic pole being set up to the module of areal coordinate system;
For generating the module of seam, this module is for being divided into two halves and the preset distance that relatively moves by the stator core of described generator model, seam to a side is done Boolean calculation, makes gap be extended to the second preset distance, to form inhomogeneous seam in the position that differs 180 °;
For above-mentioned jointed generator model being carried out to the module of ad aptive mesh octatree;
Be used for utilizing above-mentioned model to carry out emulation, to analyze the module of relation of inhomogeneous seam and generator shaft voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410114953.0A CN103886206A (en) | 2014-03-25 | 2014-03-25 | Method and system for analyzing influence of joints on shaft voltage of power generator |
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| CN201410114953.0A CN103886206A (en) | 2014-03-25 | 2014-03-25 | Method and system for analyzing influence of joints on shaft voltage of power generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104462624A (en) * | 2013-09-16 | 2015-03-25 | 同济大学 | Motor temperature field data processing method based on multi-field coupling |
| CN105260565A (en) * | 2015-11-04 | 2016-01-20 | 上海电气电站设备有限公司 | Automatic iteration calculating method for load exciting current of large-scale steam turbine power generator |
-
2014
- 2014-03-25 CN CN201410114953.0A patent/CN103886206A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104462624A (en) * | 2013-09-16 | 2015-03-25 | 同济大学 | Motor temperature field data processing method based on multi-field coupling |
| CN105260565A (en) * | 2015-11-04 | 2016-01-20 | 上海电气电站设备有限公司 | Automatic iteration calculating method for load exciting current of large-scale steam turbine power generator |
| CN105260565B (en) * | 2015-11-04 | 2018-09-25 | 上海电气电站设备有限公司 | A kind of automatic Iterative computational methods of large turbo-type generator load exciting current |
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Application publication date: 20140625 |