CN102664479A - Ventilation improvement device and method for brushless exciter of synchronous motor - Google Patents
Ventilation improvement device and method for brushless exciter of synchronous motor Download PDFInfo
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- CN102664479A CN102664479A CN2012101517088A CN201210151708A CN102664479A CN 102664479 A CN102664479 A CN 102664479A CN 2012101517088 A CN2012101517088 A CN 2012101517088A CN 201210151708 A CN201210151708 A CN 201210151708A CN 102664479 A CN102664479 A CN 102664479A
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Abstract
The invention relates to a ventilation improvement device and a ventilation improvement method for a brushless exciter of a synchronous motor. The brushless exciter is an alternating-current exciter of a rotary rectifier, which is provided with an exciter and is coaxial to the synchronous motor. The ventilation improvement device comprises an exciter main shaft (1), a bearing (12), an exciter stator (5), an exciter rotor (3), a rotary rectifying disc (2), a stator engine base (4) and a exciter cover (6), wherein the rotary rectifying disc and the exciter rotor are installed on the exciter main shaft, the exciter stator is installed on the stator engine base, the exciter cover is provided with a exciter air inlet (7) and an exciter air outlet (8), a front air inlet (10) and a rear air inlet (9) are arranged at the two ends of the stator engine base, an air outlet is arranged at the upper part of the stator engine base, and the exciter air outlet is connected with the air outlet (11) at the upper part of the stator engine base. The ventilation improvement device is used for the brushless exciter.
Description
Technical field:
the present invention relates to a kind of ventilation modifying device and method of brushless exciter of synchronous machine.
Background technology:
brushless exciter be have exciter and with the AC exciter of the coaxial rotating rectifier of synchronous machine.It is the important component part of excitation system, directly influences the runnability of motor.Compare with motor, the size of exciter is little and price is low, never obtains enough attention.
synchronous motor system is made up of brushless exciter and main frame (synchronous machine) two parts, is development in recent years current collection power rapidly, and electronics and electric machine theory are a kind of New-type electric machine of one.Brushless synchronous machine has been cancelled sliding contact part (slip ring, brush) in the excitation system, has eliminated problems such as spark, heating, wearing and tearing, noise, thereby reliability is high, is used widely at petrochemical system at first.Compare with asynchronous machine; It can move it through regulating exciting current under leading power factor, help improving the power factor of electrical network, therefore; Main equipment such as large blower, water pump, ball mill, compressor, rolling mill etc., synchronous machine drives commonly used.The rotating speed of synchronous machine depends on supply frequency fully, frequency one timing, and rotating speed of motor is also just certain, and it does not become with load.These characteristics are in some drive system, and are particularly significant in multimachine Synchronizable drive systems and the accurate governing speed and steady speed controlled system.In addition, the operation stability of synchronous machine is also than higher.In view of above-mentioned advantage, synchronous machine and supporting with it brushless exciter have a wide range of applications in commercial production.
are present, and the key technology that runs in all kinds of synchronous machine main frames and the exciter maximization process all is the cooling problem under the labyrinth.Reason is that winding or copper bar overtemperature are with the safe operation that directly influences motor if the cooling air delivery design is too small; Air mass flow is excessive, and frictional dissipation increases, and electric efficiency reduces.The general direct buying external product of Chinese large-sized motor, large-size machine and exciter ventilation cooling technology that exploitation has independent intellectual property right reduce import, are the behaves of benefiting the nation and the people.
are though the exciter volume of synchronous machine is less; But inside comprises rotating rectifier dish, stator and rotor sructure; And design features such as the inter-air space is little; Rotating rectifier dish and rotor are coaxial rotating parts, and two rotary air aerodynamic field mutual superposition that rotating parts causes make internal speed field, pressure field very complicated.Adopt the ventilation cooling problem in traditional wind path Research on Calculation exciter, find that the error that produces is big relatively.Therefore, must adopt three-dimensional computations fluid dynamics CFD method, prediction is also studied the inner Three-dimensional Flow characteristic of brushless exciter, sums up speed, the pressure Changing Pattern of its inner each several part, for Design of ventilation provides theoretical direction imperative.
existing facilities air inlet is positioned at the rectifying disc top, and air outlet slit is positioned at the stator top.Find that through experiment measuring the air themperature of rectifying disc top is not an ambient temperature, but hot-air, and the air themperature of stator top opening part is lower.Find through Three dimensional Turbulent numerical flow simulation in the exciter, in this kind ventilation scheme, exciter top two openings, for the inner air flow field of rectifying disc and rotor rotation air draught generation, equal inlet/outlets each other.
Summary of the invention:
the purpose of this invention is to provide a kind of computational fluid dynamics software that adopts half of exciter structure are set up physical model and turbulent flow Mathematical Modeling, carry out the ventilation modifying device and the method for brushless exciter of the synchronous machine of multi-scheme flow field contrast number simulation.
Above-mentioned purpose realizes through following technical scheme:
The ventilation modifying device of the brushless exciter of
a kind of synchronous machine; Its composition comprises: exciter main shaft, bearing, exciter stator, exciter rotor, rotating rectifier dish, out frame, excitation hood; Described exciter main shaft is equipped with rotating rectifier dish and exciter rotor; Described out frame is equipped with exciter stator; Described excitation hood has the exciter air intake, and described excitation hood has the exciter air outlet slit, and described out frame two ends have preceding air intake and back air intake; Described out frame top has air outlet slit, and described exciter air outlet slit connects the air outlet slit that out frame top has.
The ventilation modifying device of the brushless exciter of
described synchronous machine; Described exciter air intake size and described exciter air outlet slit are measure-alike; Described air outlet slit is a hot-blast outlet; The said exciter air outlet slit of described center distance between bearings is of a size of L1, and described exciter air intake is of a size of L2 apart from the exciter air outlet slit.
The ventilation of the brushless exciter of
a kind of synchronous machine is improved one's methods, and on the excitation hood away from rotating rectifier dish one side, offers the exciter air intake; Exciter air intake center line and exciter air outlet slit distance between center line are 260mm; Out frame directly over the exciter stator iron core is offered air outlet slit, and is connected with the exciter air outlet slit through sealing ring; Air intake, air outlet slit are measure-alike.
Beneficial effect:
brushless exciter interior flow field 1. of the present invention is extremely complicated, and motor manufacturer majority is according to the ventilation wind path of the motor of introducing of the same type, through digesting and assimilating; The exciter of design larger capacity: to the brushless exciter of 20 ~ 30MW level motor; Adopt computational fluid dynamics CFD method through the applicant, the research of multi-scheme Field Flow Numerical Simulation improves method of ventilation; Above stator, set out the air port, offer air inlet in a rightabout side of rectifying disc.Premenstruum (premenstrua), numerical computations and test found that at this moment, the inlet wind-warm syndrome is an ambient temperature, and outlet temperature is a hot blast.When having avoided rectifying disc and stator top to offer two holes respectively, the phenomenon that the temperature field is chaotic is guaranteed the exciter safe and stable operation.
The understanding to its interior flow field is deepened in
2. the present invention exploitation and improve the method for ventilation of brushless exciter, has important practical significance and good prospects for application.
3. the present invention move to former design entry from the nearer left side of rotor, opening not on the out frame, and former design outlet is constant, and then the opening of stator top is net outflow.
4. the present invention adopt ventilation to improve one's methods, and exciter inlet/outlet vent air flow increases more than 10%, helps further reducing winding peak temperature in the exciter, improves the exciter life-span; Through the three-dimensional flow field numerical computations, the total ventilation quantity of exciter inlet/outlet increases, and can further reduce peak temperature, improves the exciter life-span.
Description of drawings:
accompanying drawing 1 is the structural representation of this product.
Embodiment:
Embodiment 1:
The ventilation modifying device of the brushless exciter of
a kind of synchronous machine; Its composition comprises: exciter main shaft 1, bearing 12, exciter stator 5, exciter rotor 3, rotating rectifier dish 2, out frame 4, excitation hood 6; Described exciter main shaft is equipped with rotating rectifier dish and exciter rotor; Described out frame is equipped with exciter stator; Described excitation hood has exciter air intake 7, and described excitation hood has exciter air outlet slit 8, and described out frame two ends have preceding air intake 10 and back air intake 9; Described out frame top has air outlet slit, and described exciter air outlet slit connects the air outlet slit 11 that out frame top has.
Embodiment 2:
The ventilation modifying device of the brushless exciter of
embodiment 1 described synchronous machine; It is characterized in that: described exciter air intake size and described exciter air outlet slit are measure-alike; Described air outlet slit is a hot-blast outlet; The said exciter air outlet slit of described center distance between bearings is of a size of L1, and described exciter air intake is of a size of L2 apart from the exciter air outlet slit.
Embodiment 3:
The ventilation of the brushless exciter of
a kind of synchronous machine is improved one's methods, and on the excitation hood away from rotating rectifier dish one side, offers the exciter air intake; Exciter air intake center line and exciter air outlet slit distance between center line are 260mm; Out frame directly over the exciter stator iron core is offered air outlet slit, and is connected with the exciter air outlet slit through sealing ring; Air intake, air outlet slit are measure-alike.
Embodiment 4:
The ventilation modifying device and the method for the brushless exciter of
described synchronous machine of the foregoing description, through experiment measuring, the leaving air temp of the stator top opening after the improvement is a hot blast, is air outlet slit; Another opening is an air intake.
In
accompanying drawing 1, air intake is opened on casing, and the air intake size is identical with stator top outlet size, and position L2 is less than L1.
Mark part component names such as the inner rectifying disc of exciter, stator, rotor in
accompanying drawing 1, provided the inlet/outlet position.At this moment, the distance of L1, the L2 right side that is respectively the air gateway in the figure.Require L2＜L1, that is: air intake is arranged in the stator right side of figure.
Embodiment 5:
The ventilation modifying device and the method for the brushless exciter of the described synchronous machine of the foregoing description,
air flows to the left and right sides inlet of internal stator support via the space between interior outer cage, and it is inner to get into out frame; Then, get into rotor, air gap, rectifying disc respectively, get into the air of rotor, air gap by the support left side; Flow through behind the stator wind ditch, flow out, get into the air of rectifying disc by the support right side by air outlet slit; After rotation is boosted, also get into rotor place segment space through dividing plate, part gets into rotor, air gap and stator; Internal flow is very complicated, and is final, flowed out by stator top air outlet slit.This scheme with the main difference of preceding two schemes is: the inlet/outlet of casing top conforms to design, and the loss that internal vortex causes is less.
The ventilation step of improving one's methods
according to the diagram in 1 in the accompanying drawing, and at first air intake position L2 away from host side, is confirmed in exit position above near rotor, sees accompanying drawing 1.The rotor inlet distance that requires the air intake position to disembark to offer on the seat is as far as possible little.
air intake is identical with the length and width size of air outlet slit.
Embodiment 4:
The ventilation modifying device and the method for the brushless exciter of the described synchronous machine of the foregoing description,
synchronous motor system is made up of brushless exciter and main frame (synchronous machine) two parts, is development in recent years current collection power rapidly, and electronics and electric machine theory are a kind of New-type electric machine of one.Main equipment such as large blower, water pump, ball mill, compressor, rolling mill etc., synchronous machine drives commonly used.Synchronous machine and supporting with it brushless exciter have a wide range of applications in commercial production.
The key technology that runs in
exciter maximization process is still the cooling problem under the labyrinth.Develop large-scale synchronous machine and exciter ventilation cooling technology, help promoting the innovation ability of enterprise with independent intellectual property right.
are adopted three-dimensional computations fluid dynamics CFD method and are drawn result of calculation through three-dimensional numerical value analog computation software fluent, and software fluent software for calculation is provided by PERA GLOBAL company, propose exciter and improve method of ventilation.
to improvement project figure, air flows to the left and right sides inlet of internal stator support via the space between interior outer cage, and it is inner to get into out frame; Then, get into rotor, air gap, rectifying disc respectively, get into the air of rotor, air gap by the support left side; Flow through behind the stator wind ditch, flow out, get into the air of rectifying disc by the support right side by air outlet slit; After rotation is boosted, also get into rotor place segment space through dividing plate, part gets into rotor, air gap and stator; Internal flow is very complicated, and is final, flowed out by stator top air outlet slit.This scheme with the main difference of preceding two schemes is: the inlet/outlet of casing top conforms to design, and the loss that internal vortex causes is less.
according to the diagram in the accompanying drawing 1, and at first air intake position L2 away from host side, is confirmed in exit position above near rotor, sees accompanying drawing.The rotor inlet distance that requires the air intake position to disembark to offer on the seat is as far as possible little.Air intake is identical with the length and width size of air outlet slit.
Claims (3)
1. the ventilation modifying device of the brushless exciter of a synchronous machine; Its composition comprises: the exciter main shaft; It is characterized in that: described exciter main shaft is equipped with rotating rectifier dish and exciter rotor, and described out frame is equipped with exciter stator, and described excitation hood has the exciter air intake; Described excitation hood has the exciter air outlet slit; Described out frame two ends have preceding air intake and back air intake, and described out frame top has air outlet slit, and described exciter air outlet slit connects the air outlet slit that out frame top has.
2. the ventilation modifying device of the brushless exciter of synchronous machine according to claim 1; It is characterized in that: described exciter air intake size and described exciter air outlet slit are measure-alike; Described air outlet slit is a hot-blast outlet; The said exciter air outlet slit of described center distance between bearings is of a size of L1, and described exciter air intake is of a size of L2 apart from the exciter air outlet slit.
3. the ventilation of the brushless exciter of a synchronous machine is improved one's methods, and it is characterized in that: on the excitation hood away from rotating rectifier dish one side, offer the exciter air intake; Exciter air intake center line and exciter air outlet slit distance between center line are 260mm; Out frame directly over the exciter stator iron core is offered air outlet slit, and is connected with the exciter air outlet slit through sealing ring; Air intake, air outlet slit are measure-alike.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101517088A CN102664479A (en) | 2012-05-16 | 2012-05-16 | Ventilation improvement device and method for brushless exciter of synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101517088A CN102664479A (en) | 2012-05-16 | 2012-05-16 | Ventilation improvement device and method for brushless exciter of synchronous motor |
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| CN102664479A true CN102664479A (en) | 2012-09-12 |
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| CN2012101517088A Pending CN102664479A (en) | 2012-05-16 | 2012-05-16 | Ventilation improvement device and method for brushless exciter of synchronous motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712653A (en) * | 2014-01-03 | 2014-04-09 | 北京交通大学 | Ventilation testing device of synchronous generator |
| CN105186764A (en) * | 2015-09-02 | 2015-12-23 | 哈尔滨理工大学 | Ventilation device and method of brushless excitation machine provided with bilateral rectification discs |
| CN114157114A (en) * | 2021-11-02 | 2022-03-08 | 中国长江动力集团有限公司 | Small-capacity brushless exciter adaptive to 30MW synchronous generator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105510A (en) * | 1986-08-29 | 1988-03-09 | 通用电气公司 | Adopt the brushless generator exciter of hybrid rectifier |
| JP2010178532A (en) * | 2009-01-30 | 2010-08-12 | Toshiba Corp | Motor |
| CN202524239U (en) * | 2012-04-26 | 2012-11-07 | 哈尔滨理工大学 | Ventilation improvement device for brushless exciter of synchronous motor |
-
2012
- 2012-05-16 CN CN2012101517088A patent/CN102664479A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105510A (en) * | 1986-08-29 | 1988-03-09 | 通用电气公司 | Adopt the brushless generator exciter of hybrid rectifier |
| JP2010178532A (en) * | 2009-01-30 | 2010-08-12 | Toshiba Corp | Motor |
| CN202524239U (en) * | 2012-04-26 | 2012-11-07 | 哈尔滨理工大学 | Ventilation improvement device for brushless exciter of synchronous motor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712653A (en) * | 2014-01-03 | 2014-04-09 | 北京交通大学 | Ventilation testing device of synchronous generator |
| CN103712653B (en) * | 2014-01-03 | 2016-03-30 | 北京交通大学 | A kind of synchronous generator ventilation proving installation |
| CN105186764A (en) * | 2015-09-02 | 2015-12-23 | 哈尔滨理工大学 | Ventilation device and method of brushless excitation machine provided with bilateral rectification discs |
| CN114157114A (en) * | 2021-11-02 | 2022-03-08 | 中国长江动力集团有限公司 | Small-capacity brushless exciter adaptive to 30MW synchronous generator |
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Application publication date: 20120912 |