CN201860232U - Hybrid excitation synchronous generator in parallel structure without electric excitation rotor - Google Patents

Hybrid excitation synchronous generator in parallel structure without electric excitation rotor Download PDF

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Publication number
CN201860232U
CN201860232U CN2010206010131U CN201020601013U CN201860232U CN 201860232 U CN201860232 U CN 201860232U CN 2010206010131 U CN2010206010131 U CN 2010206010131U CN 201020601013 U CN201020601013 U CN 201020601013U CN 201860232 U CN201860232 U CN 201860232U
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China
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excitation
electric excitation
electric
permanent
winding
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Expired - Fee Related
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CN2010206010131U
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Chinese (zh)
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刘明基
宋中阳
罗应立
蔡中勤
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North China Electric Power University
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North China Electric Power University
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Abstract

The utility model relates to a hybrid excitation synchronous generator in parallel structure without an electric excitation rotor. The hybrid excitation synchronous generator comprises a permanent-magnet motor (17) and an electric excitation part (18), wherein the permanent-magnet motor and the electric excitation part are coaxially arranged in an enclosure (13) in parallel; the magnetic circuits of the permanent-magnet motor part and the electric excitation part are mutually independent; an armature coil (5) is arranged in the two stator cores of the permanent-magnet motor part and the electric excitation part; another set of three-phase or multiphase excitation coil (10) is arranged in an electric excitation stator core (12); and a magnet conducting ring (11) is arranged at the internal circle of the electric excitation stator (12), so as to provide an access for an electric excitation magnetic field and an armature magnetic field. By changing the level of current and the phase in the excitation coil (10) by a frequency converter, the level of the electric excitation electromotive force and the phase in the armature coil (5) can be adjusted, so as to achieve the purpose of changing the magnitude of the output voltage. As the electric excitation part has no air gap, the magnetomotive force needed by electric excitation is reduced, and the adjusting efficiency of the magnetic field is high. No irreversible demagnetization is caused to a permanent magnet by the electric excitation magnetomotive force; meanwhile, the brushless alternating current excitation is adopted and the reliability of the motor is high.

Description

The parallel construction mixed excitation synchronous generator that does not have electric excitation rotor
Technical field
The utility model relates to a kind of hybrid exciting synchronous motor, particularly a kind of parallel construction mixed excitation synchronous generator that does not have electric excitation rotor.
Background technology
With respect to traditional electric excitation synchronous motor, permagnetic synchronous motor has advantages such as reliability height, efficient height and volume are little.But magneto is because rotor adopts the permanent magnetic steel excitation, air-gap field is not easy to regulate, as generator operation, when temperature raise, permanent magnetic steel can produce reversible demagnetization, and generator output voltage is reduced, in addition, when generator loading changed, especially when inductive load increased, output voltage further reduced.Usually the voltage change ratio of permanent magnet generator is about ± 10%, and the reliability service of load equipment is had a negative impact.So hybrid exciting synchronous motor is suggested and carried out a large amount of research, the mixed excitation electric machine that multiple structure occurred, stacked system by electricity excitation magnetic field and permanent magnetic field can be divided into series excitation formula, shunt excitation formula and mixed reed-type three kinds of structures, their main thought is that permanent magnetic field is still as the main field of motor, the electricity excitation is partly regulated the part that electromotive force need be regulated, thereby has guaranteed the stable of generator output voltage.
Patent of invention 200310106346.1 has proposed a kind of mixed excitation electric machine of biconvex electrode structure, and it is made of doubly salient permanent magnet motor and electric excitation biconvex electrode electric machine two parts, and two-part stator winding is contacted mutually.The magnetic circuit magnetic resistance changes during the rotor rotation, by changing excitation winding size of current on the electric excitation partial stator, can regulate the electromotive force of electric excitation part armature winding.But this structure is utilized the reluctance type operation principle, and the output voltage sine is not fine, needs convertor equipment just can obtain high-quality voltage during as generator operation.
Patent of invention 200310106347.6 has proposed a kind of hybrid exciting synchronous motor of two-stage structure, and motor is divided into permagnetic synchronous motor and electric excitation synchronous motor two parts, and two parts are independent mutually on magnetic circuit, a shared cover stator armature winding.Regulate electric exciting current, i.e. the size of scalable motor powered gesture.But, reduced the reliability and the environmental suitability of motor because exciting current is incorporated into the rotor-exciting winding by brush and slip ring.
A kind of hybrid exciting synchronous motor of parallel construction has been announced in patent application 200810024775.7, and motor is a two-stage structure, and one section is permagnetic synchronous motor, and another section is the brush-less electrically exciting synchronous machine, two sections coaxial rotations of rotor.Two sections motors are independent mutually on magnetic circuit, the shared cover armature winding of stator, and the induced electromotive force of two sections motors superposes in armature winding.Can regulate the size and the phase place of electric excitation electromotive force in the armature winding by the size and Orientation that changes the excitation winding electric current, thereby realize the adjusting of whole armature winding electromotive force.But electric excitation partly adopts the claw-pole motor structure, except working gas gap, also has two sections additional air gaps on the electric magnetic excitation circuit, needs to consume more electric excitation magnetomotive force, has reduced electric excitation efficiency.
The utility model content
For solving the problems of the technologies described above, the utility model provides a kind of parallel construction mixed excitation synchronous generator that does not have electric excitation rotor.
The parallel construction mixed excitation synchronous generator of no electric excitation rotor of the present utility model, its main components comprise end cap, casing, the magneto part that is made of rotating shaft, p-m rotor iron core, permanent magnetic steel, permanent magnetism partial stator iron core and armature winding and the electric excitation part that is made of magnetic conduction annulus, electric excitation stator core, electric excitation winding and armature winding in the electric excitation part.This generator is divided into magneto and electric excitation structure two parts in same casing, two parts axially are being arranged in juxtaposition, two parts are independently of one another on magnetic circuit, the shared cover stator armature winding of two parts, have identical winding distribution form, two parts are connected on circuit by armature winding; Two-part induced electromotive force superposes in armature winding.
In the stator core of electric excitation part, except above-mentioned armature winding, also embed an other cover AC excitation winding, in electric excitation partial stator, increase by a magnetic conduction annulus on the circle as inner yoke, for electricity excitation magnetic field and armature field provide path, between electricity excitation winding and the armature winding is the close coupling that is similar between the winding of the former and deputy limit of transformer, the magnetomotive force that the electricity excitation needs is few, electric excitation efficiency height; Exciting current directly is added on the excitation winding of excitation partial stator in addition, and electric excitation adopts brushless structure, good environmental adaptability.
Permagnetic synchronous motor partly is traditional surperficial magnet steel or interior permanent magnet machines structure, stator core is formed by silicon steel plate stacking, stator poles/groove cooperates the traditional distributed winding of employing even the utmost point/groove ratio of fractional-slot, to reduce the harmonic content in the armature winding electromotive force.P-m rotor further reduces harmonic content in the armature winding electromotive force by selecting suitable pole embrace or pole form optimization.The stator core of electricity excitation has identical teeth groove number with permanent magnetism partial stator iron core, but gullet depth is convenient to embed excitation winding than the tooth depth of permanent magnet motor stator.The shared cover threephase armature winding of electricity excitation part and magneto has identical winding distribution form.In the stator slot of electro-magnetic motor, embed an other cover and armature winding and have three-phase (or heterogeneous) excitation winding of same pole logarithm, design by the excitation winding distribution form, the resultant magnetic field harmonic wave that guarantees the exciting current generation is as much as possible little, and fundamental wave magnetic field is big as much as possible.If excitation winding is a three-phase, excitation winding axis and armature winding dead in line, if the multi-phase excitation winding, then wherein wherein mutually a dead in line of axis and threephase armature winding of a phase of polyphase windings.
In electric excitation partial stator, increase by a magnetic conduction annulus on the circle, the magnetic conduction annulus provides path as inner yoke for electricity excitation magnetic field and armature field, produce eddy current loss in order to reduce electric excitation part rotating magnetic field on magnetic guiding loop, magnetic guiding loop adopts the annular silicon steel plate stacking to form.There are not working gas gap and additional air gap between magnetic conduction annulus and the electric excitation stator.
The parallel construction mixed excitation synchronous generator of no electric excitation rotor of the present utility model compared with prior art has following characteristics:
1. generator adopts AC excitation to regulate output voltage, by the size of the symmetrical exciting current of control three-phase (or heterogeneous) and the adjusting of phase place realization generator output voltage.
2. electric excitation does not partly have rotor, and excitation winding is positioned at stationary part, has realized the non-brushing of excitation, has increased the reliability and the environmental suitability of motor.
3. electric excitation partial stator inner ring has a magnetic guiding loop, and electric magnetic excitation circuit does not exist working gas gap and additional air gap, and the coupling of magnetic circuit between excitation winding and the armature winding is strong, and the required magnetomotive force of electric excitation is few, electric excitation efficiency height.
4. because magneto part and electric excitation part are independently of one another on magnetic circuit, regulate electric exciting current, can not cause the irreversible demagnetization of permanent magnet, the reliability height of motor.
5. under the certain situation of electro-magnetic motor maximum saturation degree,, can change the adjustable range of generator output voltage by designing electric excitation and permanent magnetism part length unshakable in one's determination.
6. by the design of stator armature winding, excitation winding distribution form and p-m rotor field structure, can obtain high-quality generator output voltage.
Description of drawings
Below in conjunction with accompanying drawing the utility model is elaborated:
Fig. 1 is the parallel construction mixed excitation synchronous generator axial section schematic diagram of no electric excitation rotor;
Fig. 2 is the parallel construction mixed excitation synchronous generator electricity excitation division partial cross-section schematic diagram of no electric excitation rotor;
Fig. 3 is the parallel construction mixed excitation synchronous generator p-m rotor schematic cross-section of no electric excitation rotor.
Reference numeral:
The 1-rotating shaft, 2-bearing, 3-end cap, 4-permanent magnet machine rotor iron core, 5-armature winding, 6-permanent magnetic steel, 7-magneto air gap, the non-magnetic stainless steel screw of 8-, 9-permanent magnet motor stator iron core, 10-electricity excitation winding, magnetic conduction annulus in the 11-electricity excitation part, the stator core of 12-electricity excitation part, the 13-casing, 14-O grommet type seal circle, 15-fan, the 16-fan guard, 17-magneto alternator part, 18-electricity excitation part.
Embodiment
As shown in Figure 1, the parallel construction mixed excitation synchronous generator of no electric excitation rotor of the present utility model is made up of the magneto alternator part 17 on the left side and the electric excitation part 18 on the right, coaxial being contained in side by side in the same casing 13.Permanent magnetism partial stator unshakable in one's determination 9 and the stator core of electric excitation part 12 form by silicon steel plate stacking, have same teeth groove number, and present embodiment is 36 grooves, and electric excitation part stator tooth groove is darker than the permanent magnetism part, the shared cover threephase armature winding 5 of two parts stator.In electric excitation stator core 12, also embedded the symmetrical three-phase electricity excitation winding 10 of an other cover.
As shown in Figure 2, circle increases by a magnetic conduction annulus 11 in electric excitation partial stator 12, magnetic conduction annulus 11 provides path as inner yoke for electricity excitation magnetic field and armature supply magnetic field, produce eddy current loss in order to reduce electric excitation part rotating magnetic field on magnetic conduction annulus 11, magnetic conduction annulus 11 adopts the annular silicon steel plate stacking to form.Not additional air gap and working gas gap between magnetic conduction annulus 11 and the electric excitation stator core 12.Between alternator shaft 1 and magnetic conduction annulus 11 annulus enough big slit is arranged, be convenient to assembling.
As shown in Figure 3, p-m rotor adopts surperficial magnet steel structure, and permanent magnetic steel 6 adopts non-magnetic stainless steel screw 8 to be fixed in the rotor core 4, and rotor core 4 is that two No. ten steel process.
In order to guarantee the normal operation of generator, as shown in Figure 1, alternator shaft 1 supports by two bearings 2 at two ends, and bearing 2 is installed in the bearing pedestal of two ends end cap 3.For the ease of the assembling of p-m rotor, it is big slightly that the air gap 7 of permanent magnet generator part can design, and (certainly for low power generator can design smaller slightly).At the faying face place of electric generator casing 13 and two ends end cap 3, seal with O grommet type seal circle 14, to improve the adaptability of generator to humidity even rainwater environment.In order to improve the heat-sinking capability of generator, designed fan 15 and fan guard 16 at the non-shaft stretching end of generator, fan 15 is installed in the on-mechanical power input of rotating shaft 1, and generator is carried out wind-cooling heat dissipating.
When feeding the symmetrical alternating current exciting current in three-phase (or heterogeneous) excitation winding, form rotating excitation magnetic field on the space of electric excitation part, the size in rotating excitation magnetic field is relevant with exciting current, and exciting current is big more, and magnetic field is strong more; The space phase of rotating magnetic field is relevant with the phase place of exciting current.Regulate exciting current size and phase place, the i.e. size and the phase place of electric excitation induced electromotive force in the scalable armature winding.
When moving when generator no-load running or than underload, output voltage is usually above rated voltage, in the electric excitation winding of three-phase (or heterogeneous), feed the AC excitation electric current this moment, the size and the phase place of control exciting current, make the exciting current resultant magnetic field spatially opposite with the permanent magnetic field phase place, be that the exciting current resultant magnetic field is on the parallel lines of permanent magnetism magnetic pole axis, but direction and permanent magnetic field are opposite, thereby the electric excitation electromotive force that in the electric excitation part of armature winding, produces and the electromotive force antiphase of permanent magnetism part, because magneto part electromotive force and electric excitation part induced electromotive force are superimposed in armature winding, so total electromotive force reduces in the armature winding, output voltage maintains near the rated voltage, and the exciting current of this moment has been equivalent to demagnetizing effect.
When generator institute bringing onto load continues to increase, be armature supply when increasing to a certain numerical value, the electromotive force that permanent magnetism partly produces just balances each other with rated voltage and generator impedance drop, does not need to provide electric exciting current this moment, be that exciting current is zero, output voltage maintains near the rated voltage.
When generator loading continues to increase, it is big that armature supply becomes, the motor impedance drop further increases, the generator temperature rise also can make the permanent magnet induction electromotive force reduce in addition, make output voltage be lower than rated voltage, need to regulate exciting current size and phase place this moment, make synthetic magnetic field of exciting current and magneto magnetic field partly same-phase spatially, be that the exciting current resultant magnetic field is on permanent magnetism magnetic pole parallel axes line, and direction is identical with permanent magnetic field, thereby the electromotive force same-phase of electromotive force that electricity excitation magnetic field is responded in armature winding and permanent magnetic field induction, synthetic electromotive force in the armature winding is greater than the Permanent Magnet and Electric kinetic potential, exciting current has been equivalent to increase magnetic action, and output voltage continues to maintain near the rated voltage.

Claims (3)

1. the parallel construction mixed excitation synchronous generator that does not have electric excitation rotor, its main components comprises end cap (3), casing (13), by rotating shaft (1), p-m rotor iron core (4), permanent magnetic steel (6), the magneto part (17) that permanent magnetism partial stator iron core (9) and armature winding (5) constitute, and by magnetic conduction annulus (11) in the electric excitation part, electricity excitation stator core (12), the electric excitation part (18) that electricity excitation winding (10) and armature winding (5) constitute, it is characterized in that
-described magneto part (17) and described electric excitation part (18) are installed in the same casing (13) along axially being arranged in juxtaposition successively, and two parts magnetic circuit is independently of one another;
The shared cover armature winding (5) of-described two parts motor has identical winding distribution form, by armature winding (5) two parts is connected on circuit;
-permanent magnet machine rotor adopts surperficial magnet steel structure or built-in magnet steel structure;
-described permanent magnetism partial stator iron core (9) has identical teeth groove number with described electric excitation part stator core (12), and stator poles/groove cooperates the traditional distributed winding of employing even the utmost point/groove ratio of fractional-slot.
2. generator as claimed in claim 1, it is characterized in that, the groove of described electric excitation stator core (12) except placing described armature winding (5), also embeds a cover three-phase or a heterogeneous electric excitation winding (10) than the groove depth of described permanent magnetism partial stator iron core (9).
3. generator as claimed in claim 1 is characterized in that, a magnetic conduction annulus (11) is arranged as inner yoke on the circle in the described electric excitation partial stator, and electric excitation part is without any air gap.
CN2010206010131U 2010-11-08 2010-11-08 Hybrid excitation synchronous generator in parallel structure without electric excitation rotor Expired - Fee Related CN201860232U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064643A (en) * 2010-11-08 2011-05-18 华北电力大学 Parallel structural hybrid excitation synchronous generator without electrical excitation rotor
CN104868670B (en) * 2015-06-10 2017-03-22 哈尔滨理工大学 Magnetic flux modulated composite motor in parallel hybrid excitation structure
CN110601476A (en) * 2019-09-17 2019-12-20 淮阴工学院 Radial magnetic field axial parallel composite motor
CN113964964A (en) * 2021-11-15 2022-01-21 西安热工研究院有限公司 Permanent magnet demagnetization fault simulation device of permanent magnet wind driven generator based on electric signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064643A (en) * 2010-11-08 2011-05-18 华北电力大学 Parallel structural hybrid excitation synchronous generator without electrical excitation rotor
CN102064643B (en) * 2010-11-08 2012-11-21 华北电力大学 Parallel structural hybrid excitation synchronous generator without electrical excitation rotor
CN104868670B (en) * 2015-06-10 2017-03-22 哈尔滨理工大学 Magnetic flux modulated composite motor in parallel hybrid excitation structure
CN110601476A (en) * 2019-09-17 2019-12-20 淮阴工学院 Radial magnetic field axial parallel composite motor
CN113964964A (en) * 2021-11-15 2022-01-21 西安热工研究院有限公司 Permanent magnet demagnetization fault simulation device of permanent magnet wind driven generator based on electric signals

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110608

Termination date: 20141108

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