CN101917077A - Mixing adjustable excited non salient pole rotor for large air-cooled turbine generator - Google Patents
Mixing adjustable excited non salient pole rotor for large air-cooled turbine generator Download PDFInfo
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- CN101917077A CN101917077A CN 201010280819 CN201010280819A CN101917077A CN 101917077 A CN101917077 A CN 101917077A CN 201010280819 CN201010280819 CN 201010280819 CN 201010280819 A CN201010280819 A CN 201010280819A CN 101917077 A CN101917077 A CN 101917077A
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Abstract
The invention relates to a mixing adjustable excited non salient pole rotor for a large air-cooled turbine generator, which belongs to the technical field of motors and solves the problem of high temperature in the rotor of a traditional turbine generator caused by enhancement of current density of rotor windings in order to increase capacity. The rotor comprises a four-pole rotor iron core and two sets of rotor windings; four large teeth and four groups of small teeth of the four-pole rotor iron core are distributed at intervals; tooth grooves are arranged between adjacent teeth; the bottom center of each tooth groove is provided with a rotor assistant groove; the width of the rotor assistant groove is smaller than that of the tooth grooves; the rotor also comprises a plurality of permanent magnets; the bottom of each tooth groove is embedded with a permanent magnet; each two groups of small teeth is wound with a set of rotor winding; and the rotor windings are positioned above the permanent magnets. The rotor is used for improving the traditional turbine generator.
Description
Technical field
The present invention relates to a kind of mixing adjustable excited non salient pole rotor for large air-cooled turbine generator, belong to technical field of motors.
Background technology
Rotor of steam turbo generator is the load torque that is used for transmitting steam-turbine fed, when the rotor of steam turbo generator winding passes to exciting current, can produce powerful magnetic field on the rotor body.The rotor winding also claims excitation winding, and its exciting power is about 0.4%-1.0% with the ratio of host capacity, and for example the excitation capacity of 300MW level generator is 1200～1650KW.Because the rotor winding is high density, its exciting current can cause the motor rotor part heating, when temperature distributing disproportionation is spared, and the electromechanics vibration that also can cause thermal unbalance to cause.Problems such as jumbo rotor of steam turbo generator usually takes place that turn-to-turn short circuit, winding earth and lead-in wire ground connection are opened circuit, the fault that these internal rotors take place not only cause generator by forced-stopping machine, and the repair time is long.
Rotor of steam turbo generator adopts the winding of hidden pole type, twines a group rotor winding respectively on two pairs of utmost point rotors of existing four-pole turbo-generator, and every group rotor winding is made up of the some cover concentric coils that vary in size.In the time will increasing the capacity of motor, need the rotor winding in limited space, to produce enough field ampere-turns values, the means that adopt are exactly to improve the current density of rotor winding, but the loss density of rotor winding also sharply rises thereupon, the heat that is produced by loss can cause at the internal rotor of volume compact own and concentrate heating like this, make the temperature of rotor too high, cause bigger slot wedge temperature drop and tooth temperature drop.
Summary of the invention
The objective of the invention is in order to solve existing turbo generator is the increase capacity, and improves the current density of rotor winding, causes the too high problem of internal rotor temperature, and a kind of mixing adjustable excited non salient pole rotor for large air-cooled turbine generator is provided.
The present invention includes four utmost point rotor cores and two cover rotor windings, four canine tooths and four groups of little teeth of four utmost point rotor cores are arranged separately, are teeth groove between adjacent teeth and the tooth, and the bottom centre of each teeth groove has the secondary groove of rotor, the groove width of the secondary groove of rotor is less than the groove width of teeth groove
It also comprises a plurality of permanent magnets, and each gullet base is embedded with a permanent magnet, twines a cover rotor winding on per two groups of little teeth, and the rotor winding is positioned at the top of permanent magnet.
Advantage of the present invention is: the present invention is by the mode of the composite excitation that adopts permanent magnet and combine with the electric excitation of rotor winding, and under the identical situation of capacity motor, the exciting current of relative reduction motor can reduce the temperature of rotor thus.Simultaneously, permanent magnet is combined with electric excitation, can avoid under the situation of excitation system fault, cause the complete excitation loss operation of motor, and then avoid motor when the loss of excitation asynchronous operation, owing to causing the too high accident of rotor winding temperature, the motor absorbing reactive power takes place.
The invention provides a kind of non salient pole rotor for large air-cooled turbine generator structure that improves the rotor-exciting fail safe and reduce rotor excitation current, this structure can reduce rotor temperature rise, and can further reduce the rotor excitation loss operation time to the influence of motor stator maximum temperaturerise.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the magnetic pole distribution schematic diagram of permanent magnet among Fig. 1;
Fig. 3 is the magnetic line of force distribution map of permanent magnet among Fig. 2;
Fig. 4 is the schematic diagram of Fig. 1 rotor winding step mode;
Fig. 5 is the magnetic line of force distribution map under Fig. 4 rotor winding electric excitation mode;
Fig. 6 is the structural representation of the large air-cooled turbine generator of employing rotor with non-salient poles of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 6, present embodiment comprises four utmost point rotor cores 1 and two cover rotor windings 2, four canine tooth 1-1 and four groups little tooth 1-2 of four utmost point rotor cores 1 arrange separately, between adjacent teeth and the tooth teeth groove 1-3, the bottom centre of each teeth groove 1-3 has the secondary groove 1-4 of rotor, the groove width of the secondary groove 1-4 of rotor is less than the groove width of teeth groove 1-3
It also comprises a plurality of permanent magnets 3, and each teeth groove 1-3 bottom is embedded with a permanent magnet 3, and per two groups little tooth 1-2 go up and twine a cover rotor winding 2, and rotor winding 2 is positioned at the top of permanent magnet 3.
The joint of the secondary groove 1-4 of teeth groove 1-3 and rotor has formed the shoulder structure in the present embodiment, and this shoulder structure helps fixed permanent magnet 3.
The rotor of steam turbo generator of existing quaternary structure is only by carrying out excitation to rotor winding 2 logical direct currents.After adopting technological means of the present invention to improve, the basic building block of turbo generator has comprised stator core, stator winding, rotor winding 2, rotor permanent magnet 3, the secondary groove 1-4 of rotor, four utmost point rotor cores 1, air gap and rotating shaft, as shown in Figure 6.The relation in the magnetic field that produced with 2 energisings of every cover rotor winding of arranging of permanent magnet 3 as shown in Figure 1, wherein the air gap flux density that adopts permanent magnet 3 to be produced separately can reach 0.4T, for large-scale non-salient pole turbo generator, air gap flux density under the specified no-load condition is 0.9T, therefore as can be seen, adopt permanent magnet 3 that bigger air-gap mmf can be provided separately, after adopting permanent magnet 3 excitations, can reduce the electric exciting current of rotor winding 2 by a relatively large margin, and then the temperature rise of reduction rotor winding 2 and four utmost point rotor cores 1, guarantee the safe operation of motor.
Embodiment two: to Fig. 6 present embodiment is described below in conjunction with Fig. 1, present embodiment is for to the further specifying of execution mode one, and the magnetic field that described rotor winding 2 energisings produce is identical with the direction in permanent magnet 3 formed magnetic fields.Other composition and annexation are identical with execution mode one.
Figure 3 shows that in the present embodiment, when the electric current of rotor winding 2 is zero, by the magnetic line of force distribution map of permanent magnet 3 generations; Figure 5 shows that the magnetic line of force distribution map that forms magnetic field by rotor winding 2.By Fig. 3 and Fig. 5 as can be seen, the magnetic field that the electric excitation of rotor winding 2 and permanent magnet 3 independent excitations produce all is that four utmost points distribute, and magnetic pole distributes identical.Rotor winding 2 when four utmost point rotor cores, 1 upper strata applies DC excitation, and when lower floor adopted permanent magnet 3 excited by both simultaneously, two kinds of magnetic fields will superpose, and produce a resultant flux.Because adopt permanent magnet 3 can produce the magnetic field intensity of 0.4T separately, this will reduce the intensity of the direct current of rotor winding 2 greatly, and then reduce the temperature of rotor.In addition, only adopt electric excitation owing to the motor excitation system in the prior art, when excitation system produces fault, in the process that exciting current descends, generator changes leading phase operation very soon over to, draw reactive power setting up the excitation of unit from system, generator carrying to system during by original normal operation idlely drawn idlely when transferring the loss of excitation asynchronous operation to from system, cause the reduction of system voltage.Adopt permanent magnet 3 to carry out composite excitation among the present invention, can avoid the complete loss of excitation of rotor, reduce rotor, avoid causing system voltage low excessively from the size that system draws reactive power.In addition, only adopt the generator of electric excitation, because motor-field intensity reduces during the loss of excitation state, the stator winding induced potential reduces, and under the constant condition of power output, stator current will increase, cause the stator winding temperature rising.Adopt composite excitation structure of the present invention,, can avoid the stator winding induced potential excessively to reduce, can make motor be in the low operation under the state of encouraging by the excitation that permanent magnet 3 produces.
Claims (2)
1. mixing adjustable excited non salient pole rotor for large air-cooled turbine generator, it comprises four utmost point rotor cores (1) and two cover rotor windings (2), four canine tooths (1-1) and four groups of little teeth (1-2) of four utmost point rotor cores (1) are arranged separately, it between adjacent teeth and the tooth teeth groove (1-3), the bottom centre of each teeth groove (1-3) has the secondary groove (1-4) of rotor, the groove width of the secondary groove of rotor (1-4) is characterized in that less than the groove width of teeth groove (1-3):
It also comprises a plurality of permanent magnets (3), and each teeth groove (1-3) bottom is embedded with a permanent magnet (3), and per two groups of little teeth (1-2) are gone up and twined a cover rotor winding (2), and rotor winding (2) is positioned at the top of permanent magnet (3).
2. mixing adjustable excited non salient pole rotor for large air-cooled turbine generator according to claim 1 is characterized in that: the magnetic field that described rotor winding (2) energising produces is identical with the direction in the formed magnetic field of permanent magnet (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010280819 CN101917077A (en) | 2010-09-14 | 2010-09-14 | Mixing adjustable excited non salient pole rotor for large air-cooled turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010280819 CN101917077A (en) | 2010-09-14 | 2010-09-14 | Mixing adjustable excited non salient pole rotor for large air-cooled turbine generator |
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| CN101917077A true CN101917077A (en) | 2010-12-15 |
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| CN 201010280819 Pending CN101917077A (en) | 2010-09-14 | 2010-09-14 | Mixing adjustable excited non salient pole rotor for large air-cooled turbine generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195379A (en) * | 2011-05-19 | 2011-09-21 | 薛生军 | Improved magnet pole combined motor |
| CN105391261A (en) * | 2015-12-02 | 2016-03-09 | 上海大学 | High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor |
| CN108649766A (en) * | 2018-05-17 | 2018-10-12 | 大连创为电机有限公司 | The hybrid synchronous motor of non-salient pole salient pole |
| CN113708527A (en) * | 2021-09-02 | 2021-11-26 | 哈尔滨工业大学（威海） | Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005354770A (en) * | 2004-06-09 | 2005-12-22 | Toshiba Corp | Dynamo-electric machine |
| CN101316055A (en) * | 2007-05-28 | 2008-12-03 | 株式会社东芝 | Rotor of a turbo generator and turbo generator |
-
2010
- 2010-09-14 CN CN 201010280819 patent/CN101917077A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005354770A (en) * | 2004-06-09 | 2005-12-22 | Toshiba Corp | Dynamo-electric machine |
| CN101316055A (en) * | 2007-05-28 | 2008-12-03 | 株式会社东芝 | Rotor of a turbo generator and turbo generator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195379A (en) * | 2011-05-19 | 2011-09-21 | 薛生军 | Improved magnet pole combined motor |
| CN105391261A (en) * | 2015-12-02 | 2016-03-09 | 上海大学 | High-speed non-salient-pole electrically excited synchronous motor rotor in air gap magnetic field sine distribution and structural parameter determination method of rotor |
| CN108649766A (en) * | 2018-05-17 | 2018-10-12 | 大连创为电机有限公司 | The hybrid synchronous motor of non-salient pole salient pole |
| CN113708527A (en) * | 2021-09-02 | 2021-11-26 | 哈尔滨工业大学（威海） | Non-salient pole type electro-magnetic wound rotor and synchronous motor thereof |
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Open date: 20101215 |