CN114553076B - Micro-torque fluctuation doubly salient direct current excitation generator - Google Patents
Micro-torque fluctuation doubly salient direct current excitation generator Download PDFInfo
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- CN114553076B CN114553076B CN202210162215.8A CN202210162215A CN114553076B CN 114553076 B CN114553076 B CN 114553076B CN 202210162215 A CN202210162215 A CN 202210162215A CN 114553076 B CN114553076 B CN 114553076B
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- 239000013598 vector Substances 0.000 claims description 31
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/38—Structural association of synchronous generators with exciting machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, and belongs to the technical field of wind driven generators. The invention comprises a stator, a diode rectifying circuit and an exciting current controller. The stator/rotor pole pair number of the generator is 6N/2 (2N+1). Each stator pole is embedded with an armature winding element, wherein each phase of the three-phase armature winding is composed of 2N armature winding elements, an alternating current output is generated by forming a phase of armature winding in series/parallel connection, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit. An excitation winding coil is embedded outside each group of three armature windings on the stator, and a total of 2N excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller. The invention is used for wind power generation, has small torque fluctuation, and the rotor has excellent characteristics of no permanent magnet, no winding, no shaft voltage, high power generation efficiency, high reliability, low cost and the like.
Description
Technical Field
The invention relates to the technical field of wind driven generators, in particular to a micro-torque fluctuation doubly salient direct current excitation generator.
Background
The doubly salient DC excitation generator is characterized by simple structure, high reliability, low cost and the like because of no shaft voltage, no winding, no magnetic steel, no brush and the like on a rotor, thereby becoming a new research direction in the field of DC generator and control thereof. The micro-torque fluctuation doubly salient direct current excitation generator is a generator product innovatively developed on the basis of the doubly salient direct current excitation generator, has all the advantages of the doubly salient direct current excitation generator, greatly reduces torque fluctuation, solves the bottleneck puzzling the application process of the doubly salient direct current excitation generator, and is particularly suitable for high-power wind power generation with larger outer diameter.
The currently used doubly salient direct current excitation generator technology is composed of 6N/4N stator-rotor pole pairs, the electric angle difference between each armature winding is 240 degrees, the electric angles of each winding unit in each phase of armature winding belong to the same vector, and the series-parallel connection can be randomly carried out, but the torque fluctuation can exceed 100%, and particularly, the torque fluctuation can seriously affect the service life of a blade or a gear in a gear box in the application of a wind driven generator, so that the doubly salient direct current excitation generator technology can not be used.
In summary, innovative design of a double-salient direct current excitation generator with ultra-micro torque fluctuation is urgently needed, and the double-salient direct current excitation generator is simple in structure and manufacturing process, good in reliability, low in cost and suitable for being used as a high-power wind driven generator.
The prior art has at least the following disadvantages:
1. the torque fluctuation is large;
2. which has a serious impact on the life of the gears in the blade or gearbox.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a micro-torque fluctuation doubly salient direct current excitation generator, a stator, a rotor without shaft voltage, windings and permanent magnets, a diode rectifying circuit and an excitation current controller; the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles; each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit; every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current; wherein N is an integer greater than or equal to 6; j is taken as 3, 6 or 9. The invention provides a novel stator-rotor pole pair number strategy, a novel armature winding vector split-phase method and a novel connecting method, and the rotor has the characteristics of no shaft voltage, no winding and no permanent magnet, reduces the torque fluctuation of the generator, has the characteristics of high reliability, simple manufacturing process and the like, and is suitable for being made into a high-power brushless direct current wind driven generator.
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, which comprises: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles;
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current;
wherein,
n is an integer greater than or equal to 6;
j is taken as 3, 6 or 9.
Preferably, the electrical phase difference between two adjacent armature winding elements on the stator is<260 °, among 6N armature winding elements, M armature winding elements having the same electrical phase angle constitute one vector, 6N/M vectors per stator;
wherein,
m is 2, 3, 4, 5 or 6.
Preferably, each phase winding of the three-phase armature winding comprises 2N/M vectors, and K armature winding elements contained in two adjacent vectors with phase difference within <20 DEG are connected in series to form a phase winding;
wherein,
k is 3, 4, 5 or 6.
Preferably, 2P armature winding elements included in two vectors having phases differing by 0 ° and 180 ° are connected in parallel to form a phase winding;
wherein,
p=1, 2, 3, 4, 5 or 6.
Preferably, k×2p=2n.
Preferably, the teeth of the stator are equally spaced circumferentially, with a stator pole pitch of 360 °/6N.
Preferably, the teeth of the rotor are equally spaced circumferentially, with a rotor pole pitch of 360 °/2 (n+1).
Preferably, n=6, m= 2,K =3, where p=2, the stator pole pair number and the rotor pole pair number of the micro-torque ripple doubly salient dc excitation generator are 36/26 poles, each of the three phases of armature windings comprises 2n=12 armature winding elements, and the 2 p=4 armature windings are connected in parallel, and each of the k=3 armature winding elements are connected in series.
Preferably, the A-phase winding of the 36/26-pole micro-torque ripple doubly salient DC excitation generator is composed of armature winding elements within + -20 DEG electric angle with vectors of electric angles of 0 DEG and 180 DEG as the center, and comprises an armature winding A11, an armature winding A12, an armature winding A21 and an armature winding A22 which are connected in parallel. The armature winding a11 includes #1 armature winding element, #8 armature winding element, and #12 armature winding element connected in series; the armature winding a12 includes #19 armature winding elements, #26 armature winding elements, and #30 armature winding elements connected in series; the armature winding a21 includes #3 armature winding elements, #10 armature winding elements, and #17 armature winding elements connected in series; the armature winding a22 includes #21 armature winding elements, #28 armature winding elements, and #35 armature winding elements connected in series.
Preferably, the B-phase winding of the 36/26-pole micro-torque ripple doubly salient direct current excitation generator is composed of armature winding elements within ±20° electrical angles centered on vectors having electrical angles of 120 ° and 300 °, and includes an armature winding B11, an armature winding B12, an armature winding B21, and an armature winding B22 connected in parallel. The armature winding B11 includes #7 armature winding elements, #4 armature winding elements, and #18 armature winding elements connected in series; the armature winding B12 includes #25 armature winding elements, #32 armature winding elements, and #36 armature winding elements connected in series; the armature winding B21 includes #5 armature winding elements, #9 armature winding elements, and #16 armature winding elements connected in series; the armature winding B22 includes #23 armature winding elements, #27 armature winding elements, and #34 armature winding elements connected in series.
Preferably, the C-phase winding of the 36/26-pole micro-torque ripple doubly salient DC excitation generator is composed of armature winding elements within +/-20 DEG of an electrical angle, and comprises an armature winding C11, an armature winding C12, an armature winding C21 and an armature winding C22, with the electrical angle being centered on a vector of 60 DEG and 240 deg. The armature winding C11 includes #2 armature winding elements, #6 armature winding elements, and #13 armature winding elements connected in series; the armature winding C12 includes #20 armature winding elements, #24 armature winding elements, and #31 armature winding elements connected in series; the armature winding C21 includes #4 armature winding elements, #11 armature winding elements, and #15 armature winding elements connected in series; the armature winding C22 includes #22 armature winding elements, #29 armature winding elements, and #33 armature winding elements connected in series.
Preferably, the teeth of the stator are equally spaced circumferentially, with a stator pole pitch of 360/36.
Preferably, the teeth of the rotor are equally spaced circumferentially, with a rotor pole pitch of 360/26.
Preferably, the diode rectification circuit provides a\B\C three-phase alternating current output rectification to output direct current generation current.
Compared with the prior art, the invention has the following beneficial effects:
(1) The positive and brown characteristics of the three-phase current waveform are more perfect due to the increase of the least common multiple of the stator pole number and the rotor pole number, the torque fluctuation is greatly reduced, when N=6, the least common multiple of the 36/26 pole pair doubly salient generator is 234, which is far greater than the least common multiple 6 of the 36/24 pole pair when N=6 of the traditional doubly salient direct current excitation generator, and the torque fluctuation and the power loss are greatly reduced.
(2) The doubly salient direct current excitation generator rotor has the advantages of low generator cost, simple production and assembly process, low maintenance cost and the like due to the characteristics of no shaft voltage, no permanent magnet, no winding, no brush and the like, but cannot be directly applied to the field of high-power wind power generation because the torque fluctuation of the traditional 6N/4N pole structure is large. The application of the invention can fully exert the performance of the doubly salient direct current excitation generator in wind power generation application.
(3) When the invention is used, the controller does not need to use high-power high-frequency IGBT, only needs to use diode filtering rectification to output direct current, so that the cost of the controller is low, the conversion efficiency is high due to low switching loss of the used diode, the reliability is greatly improved due to no failure mode of the diode, and furthermore, the generator rotor does not have shaft voltage to cause electric corrosion to the bearing and the gearbox gear due to diode rectification, thereby having wide application prospect and great significance in the application field of offshore wind driven generators.
Drawings
FIG. 1 is a schematic representation of the electrical angle vector of a 36/26 pole double salient generator armature winding according to one embodiment of the present invention;
FIG. 2 is a graph of torque ripple of a 36/26 pole doubly salient generator in accordance with an embodiment of the present invention, as compared to a conventional 36/24 pole doubly salient generator torque ripple.
FIG. 3 is a circuit diagram of a three-phase armature winding wiring of a 36/26 pole doubly salient generator according to one embodiment of the present invention: in fig. 3, a is an armature winding of a phase a, and B is an armature winding of a phase B; c is armature winding of C phase;
fig. 4 is a schematic diagram of the wiring of a 36/26 pole doubly salient generator three-phase armature winding and a diode rectifying circuit in accordance with an embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in detail with reference to the drawings.
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, which comprises: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles;
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current;
wherein,
n is an integer greater than or equal to 6;
j is taken as 3, 6 or 9.
According to one embodiment of the invention, the electrical phase difference between two adjacent armature winding elements on the stator is<
260 °, among 6N armature winding elements, M armature winding elements having the same electrical phase angle constitute one vector, 6N/M vectors per stator;
wherein,
m is 2, 3, 4, 5 or 6.
According to a specific embodiment of the invention, each phase winding of the three-phase armature winding comprises 2N/M vectors, and K armature winding elements contained in two adjacent vectors with phase difference less than 20 DEG are connected in series to form a phase winding;
wherein,
k is 3, 4, 5 or 6.
According to one embodiment of the invention, 2P armature winding elements included in two vectors having phases differing by 0 DEG and 180 DEG are connected in parallel to form a phase winding;
wherein,
p=1, 2, 3, 4, 5 or 6.
According to a specific embodiment of the present invention, K2 p=2n.
According to a specific embodiment of the invention, the teeth of the stator are equally spaced circumferentially, with a stator pole pitch of 360 °/6N.
According to a specific embodiment of the invention, the teeth of the rotor are equally spaced circumferentially, with a rotor pole pitch of 360 °/2 (n+1).
According to one embodiment of the invention, n=6, m= 2,K =3, where p=2, the stator pole and rotor pole pairs of the micro-torque ripple doubly salient dc excitation generator are 36/26 poles, each of the three phases of armature windings comprises 2n=12 armature winding elements, the 2 p=4 armature windings are connected in parallel, and each of the k=3 armature winding elements are connected in series.
According to a specific embodiment of the invention, the A-phase winding of the 36/26-pole micro-torque ripple doubly salient direct current excitation generator is centered on vectors with electrical angles of 0 DEG and 180 DEG and consists of armature winding elements within +/-20 DEG of electrical angle, and comprises an armature winding A11, an armature winding A12, an armature winding A21 and an armature winding A22 which are connected in parallel, wherein the armature winding A11 comprises a #1 armature winding element, #8 armature winding element and a #12 armature winding element which are connected in series; the armature winding a12 includes #19 armature winding elements, #26 armature winding elements, and #30 armature winding elements connected in series; the armature winding a21 includes #3 armature winding elements, #10 armature winding elements, and #17 armature winding elements connected in series; the armature winding a22 includes #21 armature winding elements, #28 armature winding elements, and #35 armature winding elements connected in series.
According to a specific embodiment of the invention, the B-phase winding of the 36/26-pole micro-torque ripple doubly salient direct current excitation generator is centered on vectors with electrical angles of 120 DEG and 300 DEG and consists of armature winding elements within + -20 DEG electrical angles, and comprises an armature winding B11, an armature winding B12, an armature winding B21 and an armature winding B22 which are connected in parallel, wherein the armature winding B11 comprises a #7 armature winding element, #4 armature winding element and a #18 armature winding element which are connected in series; the armature winding B12 includes #25 armature winding elements, #32 armature winding elements, and #36 armature winding elements connected in series; the armature winding B21 includes #5 armature winding elements, #9 armature winding elements, and #16 armature winding elements connected in series; the armature winding B22 includes #23 armature winding elements, #27 armature winding elements, and #34 armature winding elements connected in series.
According to a specific embodiment of the invention, the C-phase winding of the 36/26-pole micro-torque ripple doubly salient direct current excitation generator is composed of armature winding elements with an electrical angle within 60 DEG and 240 DEG as a center and an electrical angle within +/-20 DEG, and comprises an armature winding C11, an armature winding C12, an armature winding C21 and an armature winding C22, wherein the armature winding C11 comprises #2 armature winding elements, #6 armature winding elements and #13 armature winding elements which are connected in series; the armature winding C12 includes #20 armature winding elements, #24 armature winding elements, and #31 armature winding elements connected in series; the armature winding C21 includes #4 armature winding elements, #11 armature winding elements, and #15 armature winding elements connected in series; the armature winding C22 includes #22 armature winding elements, #29 armature winding elements, and #33 armature winding elements connected in series.
According to a specific embodiment of the invention, the stator teeth are equally spaced circumferentially, with a stator pole pitch of 360/36.
According to a specific embodiment of the invention, the teeth of the rotor are equally spaced circumferentially, with a rotor pole pitch of 360/26.
According to one specific embodiment of the invention, the diode rectification circuit provides A\B\C three-phase alternating current output rectification to output direct current generation current.
Example 1
According to a specific embodiment of the present invention, the micro-torque ripple doubly salient direct current excitation generator of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, which comprises: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles;
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current;
wherein,
n is an integer greater than or equal to 6;
j is taken as 3, 6 or 9.
Example 2
According to one embodiment of the present invention, the micro-torque ripple doubly salient dc excitation generator of the present invention will be described in detail.
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, which comprises: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles;
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current;
wherein,
n is an integer greater than or equal to 6;
j, taking 3, 6 or 9;
the electrical phase difference between two adjacent armature winding components on the stator is<260 °, among 6N armature winding elements, M armature winding elements having the same electrical phase angle constitute one vector, 6N/M vectors per stator;
wherein,
m is 2, 3, 4, 5 or 6.
Each phase winding of the three-phase armature winding comprises 2N/M vectors, and K armature winding elements contained in two adjacent vectors with phase difference less than 20 degrees are connected in series to form a phase winding;
wherein,
k is 3, 4, 5 or 6.
2P armature winding elements contained in two vectors with the phase difference of 0 DEG and 180 DEG are connected in parallel to form a phase winding;
wherein,
p=1, 2, 3, 4, 5 or 6.
Where k×2p=2n.
The teeth of the stator are distributed at equal intervals along the circumference, and the distribution interval is 360 degrees/6N of a stator pole pitch.
The teeth of the rotor are equally spaced along the circumference, and the distribution interval is 360 degrees/2 (N+1) of the rotor pole pitch.
Example 3
According to one embodiment of the present invention, the micro-torque ripple doubly salient dc excitation generator of the present invention will be described in detail, wherein N is 6, m is 2,K is 3, and p=2 is a 36/26 pole micro-torque ripple doubly salient dc excitation generator.
The invention provides a micro-torque fluctuation doubly salient direct current excitation generator, which comprises: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the stator pole pair number and the rotor pole pair number are 6N/2 (2N+1) poles;
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, and 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current; wherein J is 3, 6 or 9.
The stator pole pair number and the rotor pole pair number of the micro-torque fluctuation doubly salient direct current excitation generator are 36/26 poles, each phase in the three-phase armature winding comprises 12 armature winding elements, 4 paths of armature windings are connected in parallel, and 3 armature winding elements in each path are connected in series.
According to a specific embodiment of the invention, the A-phase winding of the 36/26-pole micro-torque ripple doubly salient direct current excitation generator is centered on vectors with electrical angles of 0 DEG and 180 DEG and consists of armature winding elements within + -20 DEG electrical angles, and comprises an armature winding A11, an armature winding A12, an armature winding A21 and an armature winding A22 which are connected in parallel. The armature winding a11 includes #1 armature winding element, #8 armature winding element, and #12 armature winding element connected in series; the armature winding a12 includes #19 armature winding elements, #26 armature winding elements, and #30 armature winding elements connected in series; the armature winding a21 includes #3 armature winding elements, #10 armature winding elements, and #17 armature winding elements connected in series; the armature winding a22 includes #21 armature winding elements, #28 armature winding elements, and #35 armature winding elements connected in series.
The B-phase winding of the 36/26-pole micro-torque fluctuation doubly salient direct current excitation generator is centered on a vector with an electrical angle of 120 DEG and 300 DEG and consists of armature winding elements within +/-20 DEG of the electrical angle, and comprises an armature winding B11, an armature winding B12, an armature winding B21 and an armature winding B22 which are connected in parallel. The armature winding B11 includes #7 armature winding elements, #4 armature winding elements, and #18 armature winding elements connected in series; the armature winding B12 includes #25 armature winding elements, #32 armature winding elements, and #36 armature winding elements connected in series; the armature winding B21 includes #5 armature winding elements, #9 armature winding elements, and #16 armature winding elements connected in series; the armature winding B22 includes #23 armature winding elements, #27 armature winding elements, and #34 armature winding elements connected in series.
The C-phase winding of the 36/26-pole micro-torque fluctuation doubly salient direct current excitation generator is centered on a vector with an electrical angle of 60 DEG and 240 DEG and consists of armature winding elements within +/-20 DEG of the electrical angle, and comprises an armature winding C11, an armature winding C12, an armature winding C21 and an armature winding C22. The armature winding C11 includes #2 armature winding elements, #6 armature winding elements, and #13 armature winding elements connected in series; the armature winding C12 includes #20 armature winding elements, #24 armature winding elements, and #31 armature winding elements connected in series; the armature winding C21 includes #4 armature winding elements, #11 armature winding elements, and #15 armature winding elements connected in series; the armature winding C22 includes #22 armature winding elements, #29 armature winding elements, and #33 armature winding elements connected in series
Example 4
In accordance with one embodiment of the present invention, the micro-torque ripple doubly salient DC excitation generator of the present invention will be described in detail with reference to FIGS. 1-4.
As shown in fig. 1, the present invention provides a micro-torque double salient pole dc excitation generator, comprising a stator/rotor pole pair number of 6N/2 (2n+1), when n=6, forming a 36/26 pole pair generator, each stator pole being embedded with one armature winding element, and a total of 36 armature winding elements, wherein an electrical angle phase difference between each two adjacent armature winding elements is 260 °, and is divided into A1, A2 according to the electrical angle phase; b1 and B2; c1 and C2 groups of armature windings, wherein the electrical angle difference between the armature winding A1 and the armature winding A2 is 180 degrees, and the armature windings are connected in parallel to form an A-phase armature winding as shown in figure 3; the electrical angle of the armature winding B1 is 180 degrees different from that of the armature winding B2, and the armature winding B is formed after parallel connection as shown in figure 3; the armature winding C1 and the armature winding C2 are connected in parallel with 180 degrees of electric angle difference to form a C-phase armature winding as shown in figure 3.
Specifically, as shown in fig. 3, in the A1 armature winding, the armature winding a11 after the winding elements 12, 1, 8 are connected in series is connected in parallel with the armature winding a12 after the winding elements 30, 19, 26 are connected in series; in the A2 armature winding, the armature winding a21 is connected in series with the winding elements 3, 10, 17, and the armature winding a22 is connected in parallel with the winding elements 21, 28, 35.
Specifically, as shown in fig. 3, in the B1 armature winding, the armature winding B11 in which the armature winding elements 9, 16, 5 are connected in series is connected in parallel with the armature winding B12 in which the winding elements 23, 34, 27 are connected in series; in the B2 armature winding, the armature winding B21 in which the winding elements 18, 7, 14 are connected in series is connected in parallel with the armature winding B22 in which the winding elements 36, 25, 32 are connected in series.
Specifically, as shown in fig. 3, in the armature winding C1, the armature winding C11 in which the armature winding elements 15, 4, 11 are connected in series is connected in parallel with the armature winding C12 in which the winding elements 33, 22, 29 are connected in series; in the C2 armature winding, the armature winding C21 in which the winding elements 6, 13, 2 are connected in series is connected in parallel with the armature winding C22 in which the winding elements 24, 31, 20 are connected in series.
Specifically, as shown in fig. 4, the A, B, C three-phase winding is connected to a diode rectifier circuit, and outputs direct current.
The invention relates to a micro-torque doubly salient direct current excitation generator, which is based on the basic principle of reducing torque fluctuation: referring to fig. 2, the larger the least common multiple of stator/rotor tooth pole numbers, the smaller the rotor positioning torque fluctuation, so that the smaller the torque fluctuation of the rotor when the generator generates electricity. At 36/26 poles (6N/2 (2n+1), n=6), the rotor positioning torque ripple amplitude is significantly smaller than at 36/24 poles (6N/4N, n=6).
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations of the present invention are possible, such as the structure of the pole pair of 36/26 pole integer multiple, and the like, within the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (7)
1. A micro-torque ripple doubly salient dc excitation generator, comprising: the device comprises a stator, a shaftless voltage, a rotor without windings and permanent magnets, a diode rectifying circuit and an excitation current controller;
the number of poles of the stator is 6N, and the number of poles of the rotor is 2 (2N+1);
each stator pole is embedded with a three-phase armature winding element, each phase armature winding in the three-phase armature winding comprises 2N armature winding elements, the 2N armature winding elements are connected in series and in parallel to form a phase armature winding to generate alternating current output, and the alternating current generated by the three-phase armature winding outputs direct current through a diode rectifying circuit;
every J continuous adjacent armature windings on the stator form a group, an excitation winding coil is embedded outside each group of armature windings, 6N/J excitation winding coils are connected in series to form a direct current excitation circuit, and the excitation current is adjusted through an excitation current controller to adjust the generated current;
wherein,
n is an integer greater than or equal to 6;
j is taken as 3, 6 or 9.
2. The micro-torque ripple doubly salient dc excitation generator of claim 1 wherein an electrical phase difference between two adjacent armature winding elements on the stator is<260 degrees, wherein M armature winding elements with the same electric phase angle form a vector, and each stator has 6N/M vectors;
wherein,
m is 2, 3, 4, 5 or 6.
3. The micro-torque ripple doubly salient direct current excitation generator according to claim 2, wherein each phase winding of the three-phase armature winding comprises 2N/M vectors, and K armature winding elements contained in two adjacent vectors with a phase difference of <20 degrees are connected in series to form one phase winding;
wherein,
k is 3, 4, 5 or 6.
4. The micro-torque ripple doubly salient direct current excitation generator according to claim 3, wherein 2P armature winding elements included in two vectors with phase difference of 0 degrees and 180 degrees are connected in parallel to form a phase winding;
wherein,
p=1, 2, 3, 4, 5 or 6.
5. The micro-torque ripple doubly salient dc excitation generator of claim 4, wherein k2p=2n.
6. The micro-torque ripple doubly salient direct current excitation generator of claim 1, wherein each tooth pole of the stator is distributed at equal intervals along the circumference, and the distribution interval is 360 degrees/6N of a stator pole distance.
7. The micro-torque ripple doubly salient direct current excitation generator of claim 1, wherein each tooth pole of the rotor is distributed at equal intervals along the circumference, and the distribution interval is 360 degrees/2 (n+1) of a rotor pole distance.
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