CN115622305A - Generator with constant speed frequency modulation function - Google Patents
Generator with constant speed frequency modulation function Download PDFInfo
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- CN115622305A CN115622305A CN202211374554.9A CN202211374554A CN115622305A CN 115622305 A CN115622305 A CN 115622305A CN 202211374554 A CN202211374554 A CN 202211374554A CN 115622305 A CN115622305 A CN 115622305A
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- 238000004804 winding Methods 0.000 claims abstract description 95
- 230000005284 excitation Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000816 inconels 718 Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2791—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a generator with a constant speed frequency modulation function, which comprises a stator and a rotor, wherein the stator comprises a stator iron core, a first winding and a second winding, the first winding and the second winding are wound on the stator iron core, the second winding is closer to the rotor in the radial direction of the stator than the first winding, the rotor comprises a rotating shaft, and a first rotor magnetic pole group and a second rotor magnetic pole group which are arranged in the circumferential direction of the rotating shaft, the second rotor magnetic pole group is closer to the stator in the radial direction of the rotor than the first rotor magnetic pole group, the polarities of magnets forming the first rotor magnetic pole group and the second rotor magnetic pole group are alternatively changed in the respective circumferential direction, the numbers of poles of the first rotor magnetic pole group and the second rotor magnetic pole group are different, the number of poles of the first rotor magnetic pole group is the same as that of the first winding, and the number of poles of the second rotor magnetic pole group is the same as that of the second winding. The invention can realize frequency conversion output at constant rotating speed without adopting power electronic devices for frequency conversion.
Description
Technical Field
The invention relates to a generator, in particular to a generator with a constant speed frequency modulation function.
Background
With the rapid development of traffic electrification, the load power and the speed level of the electrically driven vehicle auxiliary systems tend to be various. The permanent magnet motor has the advantages of high power density, high efficiency, good dynamic characteristic and the like, and is widely applied to various traffic electric drive systems. The brushless permanent magnet motor rotor magnetic field is established by the high-performance permanent magnet, and the pole number and the magnetic performance are constant after the magnetizing is finished, so that the brushless permanent magnet motor rotor magnetic field has excellent output characteristics and torque holding capacity. However, the constant magnet properties and pole counts result in a motor speed that cannot be regulated autonomously as an asynchronous motor, and frequency-modulated speed regulation must be achieved with the aid of power electronics. Similarly, in a generator system, when the rotation speed of a prime motor is constant, the frequency of the output alternating current electromagnetic quantity is constant, and the alternating current electromagnetic quantity can be only used for various loads with different frequencies after frequency modulation or rectification and inversion by means of a power electronic device.
When the frequency modulation is performed by adopting a power electronic device, the complexity and the volume of the system are greatly improved, the power density and the efficiency are reduced, the processing and manufacturing difficulty is increased, and the cost is obviously increased. On the other hand, various power electronic devices have low temperature resistance, low overload capacity, low electromagnetic interference resistance, low redundancy of control algorithms and low reliability under complex working conditions and special application environments. Meanwhile, for the application without continuous frequency modulation, the advantage of power electronic speed regulation cannot be fully exerted, and the performance comparison advantage is not provided. In addition, new interference is introduced into the power electronic device in the rectifying, voltage stabilizing and inverting processes, and the power electronic device is not beneficial to driving loads and stable operation of other equipment in the same installation environment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the generator with the constant-speed frequency modulation function, which solves the frequency conversion problem when the rotating speed of a prime motor is constant and realizes two-stage frequency conversion output.
The technical scheme of the invention is as follows: the utility model provides a generator with constant speed frequency modulation function, includes stator and rotor, the stator includes stator core, first winding and second winding, first winding with the second winding all winds in stator core, the second winding compare in first winding is in the footpath of stator is more close to the rotor, the rotor includes the pivot and sets up at pivot circumference first rotor magnetic pole group and second rotor magnetic pole group, the second rotor magnetic pole group compare in first rotor magnetic pole group is in the footpath of rotor is more close to the stator, constitutes first rotor magnetic pole group with the polarity of the magnet of second rotor magnetic pole group is at respective circumferencial direction alternate change, first rotor magnetic pole group with the number of poles of second rotor magnetic pole group is different, the number of poles of first rotor magnetic pole group is the same with the number of poles of first winding, the number of poles of second rotor magnetic pole group is the same with the number of poles of second winding.
Furthermore, the stator is arranged on the periphery of the rotor, and the second rotor magnetic pole group is an integral magnetic ring. Thus, a non-magnetic-conductive protective sleeve is not required to be arranged outside the second rotor magnetic pole group.
The other technical scheme of the invention is as follows: a generator with a constant-speed frequency modulation function comprises a stator, a first rotor and a second rotor, wherein the stator is arranged between the first rotor and the second rotor and comprises a stator iron core, a first winding and a second winding, the first winding and the second winding are wound on the stator iron core, the first winding is close to the first rotor in the radial direction, the second winding is close to the second rotor in the radial direction, the first rotor and the second rotor are provided with a common rotating shaft, the first rotor is provided with a first rotor magnetic pole group arranged around the outer side of the stator in the circumferential direction, the second rotor is provided with a second rotor magnetic pole group arranged around the inner side of the stator in the circumferential direction, the number of poles of the first rotor magnetic pole group is different from that of the second rotor magnetic pole group, the number of poles of the first rotor magnetic pole group is the same as that of the first winding, and the number of poles of the second rotor magnetic pole group is the same as that of the second winding.
Further, the first rotor magnetic pole group and/or the second rotor magnetic pole group are/is a direct current excitation winding.
Further, the magnetizing directions of the magnets of the first rotor magnetic pole group and the second rotor magnetic pole group are the same, and the magnets are magnetized in a radial or parallel mode.
Further, the magnets of the first rotor pole group and the second rotor pole group are arranged at even intervals in the circumferential direction.
The technical scheme provided by the invention has the advantages that:
the invention realizes secondary frequency conversion output without the aid of a power electronic frequency conversion technology, and when the rotating speed of the prime motor is constant, the winding can be simply switched to emit alternating currents with different frequencies for driving loads with different frequency requirements. Secondly, the proposed generator system has simple structure, high efficiency and high reliability. Meanwhile, expensive power electronic devices are not adopted, the material and installation and application cost of the generator system is reduced, and the control difficulty is reduced. Moreover, after the frequency conversion system is eliminated, the size of the generator is greatly reduced, the power density is high, the requirement on the installation environment is reduced, the interference to the outside is small, and the application range is wider.
Drawings
Fig. 1 is a schematic structural diagram of a generator with a constant-speed frequency modulation function according to embodiment 1.
Fig. 2 is a schematic view of the stator core and the first winding of the generator with the constant-speed frequency modulation function in embodiment 1.
Fig. 3 is a schematic view of the stator core and the second winding of the generator with the constant-speed frequency modulation function in embodiment 1.
Fig. 4 is a schematic structural diagram of a rotor of a generator with a constant speed frequency modulation function according to embodiment 1.
Fig. 5 is a schematic structural diagram of a generator with a constant-speed frequency modulation function according to embodiment 2.
Fig. 6 is a schematic structural diagram of a stator of a generator with a constant-speed frequency modulation function according to embodiment 2.
Fig. 7 is a schematic structural view of a rotor of a generator with a constant speed frequency modulation function according to embodiment 2.
Fig. 8 is a schematic structural diagram of a generator with a constant speed frequency modulation function according to embodiment 3.
Fig. 9 is a schematic view of a stator structure of a generator having a constant-speed frequency modulation function according to embodiment 3.
Fig. 10 is a schematic structural view of a rotor of a generator with a constant speed frequency modulation function according to embodiment 3.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Embodiment 1, please refer to fig. 1 to 4, which relate to a generator with a constant speed frequency modulation function, wherein the rated power is 3000W, and the rated rotation speed is 5400r/min. The generator with the constant speed frequency modulation function comprises a stator 100 and a rotor 101, wherein the stator 100 is arranged on the periphery of the rotor 101 and is in a rotor 101 structure of an outer stator 100.
The stator 100 includes a stator core 1001 formed by laminating 0.35mm non-oriented silicon steel sheets, and two groups of three-phase windings, namely a first winding 1002 and a second winding 1003, wound on the stator core 1001. The stator core 1001 is provided with 18 slots 1001a uniformly distributed along the circumferential direction, and 18 stator teeth 1001b formed by the slots 1001a are respectively wound with a first winding 1002 and a second winding 1003 according to the inner layer and the outer layer. The first winding 1002 is wound as an outer ring and includes 9 coils, each of the coils of the first winding 1002 spans two stator teeth 1001b, the pitch of the coils of the first winding 1002 is 2, the number of turns is 12, and a 6-pole 9-slot winding is formed, as shown in fig. 2. The second winding 1003 is wound as an inner ring, is closer to the rotor 101 than the first winding 1002, and also comprises 9 coils, the coils of the second winding 1003 span two stator teeth 1001b, have a pitch of 2 and a number of turns of 15, and form an 8-pole 9-slot winding, as shown in fig. 3.
As shown in fig. 4, the rotor 101 of the generator is located inside the stator 100, and includes a rotating shaft 1011 and a first rotor magnetic pole group 1012 and a second rotor magnetic pole group 1013 arranged around the rotating shaft 1011 and around the circumference of the rotating shaft 1011. The rotating shaft 1011 is made of 45# magnetic steel and is connected with the output shaft of the diesel engine. The first rotor magnetic pole group 1012 comprises 6 permanent magnets, the 6 permanent magnets are uniformly distributed along the circumference, are attached to the outer side of the rotating shaft 1011 and are magnetized in the radial direction, the polarities of the magnets are arranged in a staggered mode to form 6 magnetic poles, and the number of the poles of the first rotor magnetic pole group 1012 is the same as that of the first winding 1002.
The second rotor magnetic pole group 1013 comprises 8 permanent magnets, the 8 permanent magnets are uniformly distributed along the circumference, the second rotor magnetic pole group is attached to the outer side of the first rotor magnetic pole group 1012 and adopts radial magnetization, the polarities of the magnets are staggered to form 8 magnetic poles, and the number of the second rotor magnetic pole group 1013 is the same as that of the second winding 1003. In this embodiment, the second rotor pole group 1013 is externally sleeved with a non-magnetically permeable sheath 1014, and the sheath 1014 is made of Inconel 718 alloy steel.
As a preferred embodiment, the magnetic pole group of the second rotor 101 can be configured as a complete magnetic ring, so that the radial position of the magnetic pole group of the first rotor 101 is limited by the magnetic pole group of the second rotor 101, and thus no additional magnetically-impermeable sheath is needed.
As another preferred embodiment, the permanent magnets used in the first rotor pole group 1012 and the second rotor pole group 1013 may all be replaced with dc field windings. When the dc field winding of the first rotor pole group 1012 is energized, the dc field winding of the second rotor pole group 1013 is set to an open circuit state. When the dc field winding of the second rotor pole group 1013 is energized, the dc field winding of the first rotor pole group 1012 is set to an open state. The on-off state of the two sets of direct current excitation windings is set, so that the current of the rotor direct current excitation winding and the load torque of the generator synchronously change, and the stability of the rotating speed and the frequency of the generator is enhanced. Alternatively, the permanent magnets employed in either of the first rotor pole group 1012 and the second rotor pole group 1013 may be replaced with direct current field windings.
During the operation of the generator with the constant speed frequency modulation function of the embodiment, the output shaft of the diesel engine is connected to the rotating shaft of the rotor 101, the rotor 101 rotates, the first rotor magnetic pole group 1012 induces a three-phase alternating current voltage with a frequency of 270Hz in the first winding 1002, and the second rotor magnetic pole group 1013 induces a three-phase alternating current voltage with a frequency of 360Hz in the second winding 1003. The switches are adopted to switch between the first winding 1002 and the second winding 1003, namely, a constant-speed two-stage frequency modulation function is realized, and loads with different frequency requirements are driven.
Embodiment 2, please refer to fig. 5 to 7, in which another structure of the generator with the constant speed and frequency modulation function includes a stator 200 and a rotor 201, the stator 200 is disposed inside the rotor 201 and is an outer rotor and inner stator structure.
The stator 200 includes a stator core 2001, and two sets of three-phase windings, i.e., a first winding 2002 and a second winding 2003, wound around the stator core 2001. The outer peripheral surface of the stator core 2001 is provided with uniformly distributed slots 2001a in the circumferential direction, and a first winding 2002 and a second winding 2003 are wound around stator teeth 2001b formed between the slots 2001 a. The first winding 2002 is an inner winding near the center of the stator core 2001, and the second winding 2003 is wound as an outer winding.
The rotor 201 of the generator is cylindrical, surrounds and is located outside the stator 200, and comprises a sheath 2011, and a first rotor magnetic pole group 2012 and a second rotor magnetic pole group 2013 are circumferentially arranged inside the sheath 2011. A rotating shaft (not shown) of the rotor 201 is coaxially arranged with the sheath 2011 and fixed to the sheath 2011, which is driven by a diesel engine. First rotor magnetic pole group 2012 contains 8 radial magnetized permanent magnets, and 8 permanent magnets paste in sheath 2011 inner wall along circumference evenly distributed, and the number of poles of first rotor magnetic pole group 2012 is the same with the number of poles of first winding 2002. The second rotor magnetic pole group 2013 comprises 6 radially magnetized permanent magnets, the 6 permanent magnets are uniformly distributed along the circumference and attached to the inner wall of the first rotor magnetic pole group 2012, and the number of poles of the second rotor magnetic pole group 2013 is the same as that of the second winding 2003. Therefore, when the rotor 201 is driven by the diesel engine to rotate, alternating voltages with different frequencies can be induced in the first winding 2002 and the second winding 2003 at the same rotating speed, so that a constant rotating speed two-stage frequency modulation function is realized, and loads with different frequency requirements are driven.
Embodiment 3, please refer to fig. 8 to 10, wherein a further structure of the generator with constant-speed frequency modulation function comprises a stator 300 and two rotors, namely a first rotor 301 and a second rotor 302, wherein the stator 300 is disposed between the first rotor 301 and the second rotor 302.
Claims (9)
1. The utility model provides a generator with constant speed frequency modulation function, includes stator and rotor, its characterized in that, the stator includes stator core, first winding and second winding, first winding with the second winding all winds in stator core, the second winding compare in first winding is in the footpath of stator is more close to the rotor, the rotor includes the pivot and sets up at pivot circumference first rotor magnetic pole group and second rotor magnetic pole group, the second rotor magnetic pole group compare in first rotor magnetic pole group is in the footpath of rotor is more close to the stator, constitutes first rotor magnetic pole group with the polarity of the magnet of second rotor magnetic pole group is at respective circumferencial direction alternate change, first rotor magnetic pole group with the number of poles of second rotor magnetic pole group is different, the number of poles of first rotor magnetic pole group is the same with the number of poles of first winding, the number of poles of second rotor magnetic pole group is the same with the number of poles of second winding.
2. The generator as claimed in claim 1, wherein the stator is disposed at the periphery of the rotor, and the second rotor magnetic pole group is an integral magnetic ring.
3. The generator with a constant-speed frequency modulation function according to claim 1, wherein the first rotor magnetic pole group and/or the second rotor magnetic pole group is a direct-current excitation winding.
4. The generator with a constant-speed frequency modulation function according to claim 1, wherein the magnets of the first rotor magnetic pole group and the second rotor magnetic pole group have the same magnetizing direction, and are magnetized in a radial or parallel manner.
5. The generator with a constant-speed frequency modulation function according to claim 1, wherein the magnets of the first rotor pole group and the second rotor pole group are arranged at even intervals in a circumferential direction.
6. The utility model provides a generator with constant speed frequency modulation function, its characterized in that includes stator, first rotor and second rotor, the stator set up in between first rotor and the second rotor, the stator includes stator core, first winding and second winding, first winding with the second winding all twine in stator core, first winding is radially being close to first rotor, the second winding is radially being close to the second rotor, first rotor with the second rotor has a common pivot, first rotor is equipped with around the first rotor magnetic pole group that stator outside circumference set up, the second rotor is equipped with around the inboard circumference of stator sets up the second rotor magnetic pole group, first rotor magnetic pole group with the number of poles of second rotor magnetic pole group is different, the number of poles of first rotor magnetic pole group is the same with the number of poles of first winding, the number of poles of second rotor magnetic pole group is the same with the number of poles of second winding.
7. The generator with a constant speed frequency modulation function according to claim 6, wherein the first rotor magnetic pole group and/or the second rotor magnetic pole group is a direct current excitation winding.
8. The generator with a constant speed frequency modulation function according to claim 6, wherein the magnetizing directions of the magnets of the first rotor magnetic pole group and the second rotor magnetic pole group are the same, and both the first rotor magnetic pole group and the second rotor magnetic pole group are magnetized in a radial or parallel manner.
9. The generator with a constant-speed frequency modulation function according to claim 6, wherein the magnets of the first rotor pole group and the second rotor pole group are arranged at even intervals in a circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211374554.9A CN115622305A (en) | 2022-11-04 | 2022-11-04 | Generator with constant speed frequency modulation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211374554.9A CN115622305A (en) | 2022-11-04 | 2022-11-04 | Generator with constant speed frequency modulation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115622305A true CN115622305A (en) | 2023-01-17 |
Family
ID=84876526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211374554.9A Pending CN115622305A (en) | 2022-11-04 | 2022-11-04 | Generator with constant speed frequency modulation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115622305A (en) |
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2022
- 2022-11-04 CN CN202211374554.9A patent/CN115622305A/en active Pending
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