CN115622305A - A generator with constant speed and frequency regulation function - Google Patents
A generator with constant speed and frequency regulation 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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- 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
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- 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
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- 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
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- 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
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- 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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- Y02T10/64—Electric machine technologies in electromobility
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Abstract
本发明公开了一种具有定速调频功能的发电机,包括定子和转子,定子包括定子铁心、第一绕组和第二绕组,第一绕组和第二绕组均绕制于定子铁心,第二绕组相比于第一绕组在定子的径向上更靠近转子,转子包括转轴以及设置在转轴周向的第一转子磁极组和第二转子磁极组,第二转子磁极组相比于第一转子磁极组在转子的径向上更靠近定子,组成第一转子磁极组和第二转子磁极组的磁体的极性在各自的圆周方向交替变化,第一转子磁极组和第二转子磁极组的极数不同,第一转子磁极组的极数与第一绕组的极数相同,第二转子磁极组的极数与第二绕组的极数相同。本发明不需采用功率电力电子器件变频,可在恒定转速下实现变频输出。
The invention discloses a generator with constant speed and frequency modulation function, comprising a stator and a rotor, the stator comprises a stator core, a first winding and a second winding, both the first winding and the second winding are wound on the stator core, the second winding Compared with the first winding, it is closer to the rotor in the radial direction of the stator, and the rotor includes a rotating shaft and a first rotor magnetic pole group and a second rotor magnetic pole group arranged in the circumferential direction of the rotating shaft. Compared with the first rotor magnetic pole group, the second rotor magnetic pole group Closer to the stator in the radial direction of the rotor, the polarities of the magnets constituting the first rotor pole group and the second rotor pole group alternately change in their respective circumferential directions, and the pole numbers of the first rotor pole group and the second rotor pole group are different, The number of poles of the first rotor magnetic pole set is the same as that of the first winding, and the number of poles of the second rotor magnetic pole set is the same as that of the second winding. The invention does not need frequency conversion of power electronic devices, and can realize frequency conversion output at a constant rotating speed.
Description
技术领域technical field
本发明涉及一种发电机,特别是涉及一种具有定速调频功能的发电机。The invention relates to a generator, in particular to a generator with the function of constant speed and frequency regulation.
背景技术Background technique
随着交通电气化的快速发展,电驱动车辆辅助系统的负载功率和转速等级趋向多样。永磁电机具有功率密度高、效率高及动态特性好等优点,在各类交通电驱动系统中得到了广泛应用。无刷永磁电机转子磁场由高性能永磁体建立,在充磁完成后极数和磁性能恒定,因此具有优异的输出特性和转矩保持能力。然而,恒定的磁体性能和极数导致电机转速无法像异步电机一样实现自主调节,必须借助于功率电力电子器件实现调频调速。类似地,在发电机系统中,原动机转速恒定时,输出的交流电磁量频率恒定,只能借助于电力电子器件调频或整流、逆变后提供给各类频率不同的负载使用。With the rapid development of transportation electrification, the load power and speed levels of electric drive vehicle auxiliary systems tend to be diverse. Permanent magnet motors have the advantages of high power density, high efficiency and good dynamic characteristics, and have been widely used in various transportation electric drive systems. The rotor magnetic field of the brushless permanent magnet motor is established by high-performance permanent magnets, and the number of poles and magnetic properties are constant after magnetization is completed, so it has excellent output characteristics and torque retention. However, the constant magnet performance and number of poles lead to the fact that the motor speed cannot be adjusted autonomously like an asynchronous motor, and power electronic devices must be used to realize frequency regulation and speed regulation. Similarly, in the generator system, when the speed of the prime mover is constant, the frequency of the output AC electromagnetic quantity is constant, and it can only be used by frequency modulation, rectification, and inversion of power electronic devices for various loads with different frequencies.
采用功率电力电子器件调频时,系统的复杂度和体积大幅提高,功率密度和效率降低,加工制造难度增大,成本显著增加。另一方面,各类功率电力电子器件耐温性不高,过载能力差,抗电磁干扰能力弱,控制算法冗余度不高,在复杂工况以及特殊应用环境下可靠性不高。同时,对于不需要连续调频的应用,功率电力电子调速的优势不能充分发挥,不具备性能比较优势。另外,功率电力电子器件在整流、稳压及逆变过程中会引入新的干扰,不利于驱动负载及同一安装环境下的其他设备稳定运行。When the frequency modulation of power electronic devices is used, the complexity and volume of the system will be greatly increased, the power density and efficiency will be reduced, the difficulty of processing and manufacturing will increase, and the cost will increase significantly. On the other hand, all kinds of power electronic devices have low temperature resistance, poor overload capacity, weak anti-electromagnetic interference ability, low redundancy of control algorithms, and low reliability in complex working conditions and special application environments. At the same time, for applications that do not require continuous frequency regulation, the advantages of power electronic speed regulation cannot be fully utilized, and there is no comparative advantage in performance. In addition, power electronic devices will introduce new interference in the process of rectification, voltage stabilization and inverter, which is not conducive to the stable operation of driving loads and other equipment in the same installation environment.
发明内容Contents of the invention
为了克服上述现有技术的不足,本发明提供了一种具有定速调频功能的发电机,解决原动机转速恒定时的变频问题,实现两级变频输出。In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a generator with constant-speed frequency modulation function, which solves the frequency conversion problem when the prime mover rotates at a constant speed, and realizes two-stage frequency conversion output.
本发明技术方案如下:一种具有定速调频功能的发电机,包括定子和转子,所述定子包括定子铁心、第一绕组和第二绕组,所述第一绕组和所述第二绕组均绕制于所述定子铁心,所述第二绕组相比于所述第一绕组在所述定子的径向上更靠近所述转子,所述转子包括转轴以及设置在转轴周向的第一转子磁极组和第二转子磁极组,所述第二转子磁极组相比于所述第一转子磁极组在所述转子的径向上更靠近所述定子,组成所述第一转子磁极组和所述第二转子磁极组的磁体的极性在各自的圆周方向交替变化,所述第一转子磁极组和所述第二转子磁极组的极数不同,所述第一转子磁极组的极数与所述第一绕组的极数相同,所述第二转子磁极组的极数与所述第二绕组的极数相同。The technical solution of the present invention is as follows: a generator with constant speed and frequency modulation function, including a stator and a rotor, the stator includes a stator core, a first winding and a second winding, and both the first winding and the second winding are wound Manufactured on the stator core, the second winding is closer to the rotor in the radial direction of the stator than the first winding, and the rotor includes a rotating shaft and a first rotor pole group arranged in the circumferential direction of the rotating shaft and a second rotor pole group, the second rotor pole group is closer to the stator in the radial direction of the rotor than the first rotor pole group, forming the first rotor pole group and the second rotor pole group The polarities of the magnets of the rotor pole group alternately change in respective circumferential directions, the number of poles of the first rotor pole group and the second rotor pole group are different, and the number of poles of the first rotor pole group is different from that of the second rotor pole group. The number of poles of the first winding is the same, and the number of poles of the second rotor magnetic pole group is the same as that of the second winding.
进一步地,所述定子设置于所述转子的外围,所述第二转子磁极组为一整体式磁环。如此在第二转子磁极组外可以不再需要设置非导磁保护套。Further, the stator is arranged on the periphery of the rotor, and the second rotor pole set is an integral magnetic ring. In this way, it is no longer necessary to arrange a non-magnetically conductive protective cover outside the second rotor magnetic pole group.
本发明的另一技术方案如下:一种具有定速调频功能的发电机,包括定子、第一转子和第二转子,所述定子设置于所述第一转子和所述第二转子之间,所述定子包括定子铁心、第一绕组和第二绕组,所述第一绕组和所述第二绕组均绕制于所述定子铁心,所述第一绕组在径向上靠近所述第一转子,所述第二绕组在径向上靠近所述第二转子,所述第一转子和所述第二转子具有一共同转轴,所述第一转子设有围绕所述定子外侧周向设置的第一转子磁极组,所述第二转子设有围绕所述定子内侧周向设置的第二转子磁极组,所述第一转子磁极组与所述第二转子磁极组的极数不同,所述第一转子磁极组的极数与所述第一绕组的极数相同,所述第二转子磁极组的极数与所述第二绕组的极数相同。Another technical solution of the present invention is as follows: a generator with a constant-speed and frequency-regulating function includes a stator, a first rotor and a second rotor, the stator is arranged between the first rotor and the second rotor, The stator includes a stator core, a first winding and a second winding, both the first winding and the second winding are wound on the stator core, the first winding is radially close to the first rotor, The second winding is radially close to the second rotor, the first rotor and the second rotor have a common rotating shaft, and the first rotor is provided with a first rotor circumferentially arranged around the outer side of the stator magnetic pole set, the second rotor is provided with a second rotor magnetic pole set circumferentially arranged around the inner side of the stator, the number of poles of the first rotor magnetic pole set is different from that of the second rotor magnetic pole set, and the first rotor The number of poles of the 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.
进一步地,所述第一转子磁极组和/或所述第二转子磁极组为直流励磁绕组。Further, the first rotor pole set and/or the second rotor pole set are DC field windings.
进一步地,所述第一转子磁极组和所述第二转子磁极组的磁体充磁方向相同,均为径向或平行方式充磁。Further, the magnetization directions of the first rotor pole group and the second rotor pole group are the same, and both are magnetized in a radial or parallel manner.
进一步地,所述第一转子磁极组和所述第二转子磁极组的磁体在周向均匀间隔布置。Further, the magnets of the first rotor pole group and the second rotor pole group are evenly spaced in the circumferential direction.
本发明所提供的技术方案的优点在于:The advantage of the technical solution provided by the present invention is:
本发明无需借助电力电子变频技术实现二级变频输出,原动机转速恒定时,通过简单地切换绕组可以发出不同频率的交流电,用于驱动不同频率需求的负载。其次,所提出的发电机系统结构简单,效率高,可靠性高。同时,不采用昂贵的电力电子器件,发电机系统的材料和安装应用成本降低,控制难度减小。再者,消除变频系统后,发电机的体积大幅减小,功率密度高,对安装环境要求降低,对外界的干扰小,应用范围更为广泛。The invention does not need to use power electronic frequency conversion technology to realize the secondary frequency conversion output. When the prime mover rotates at a constant speed, alternating currents of different frequencies can be generated by simply switching windings to drive loads with different frequency requirements. Second, the proposed generator system has a simple structure, high efficiency, and high reliability. At the same time, without using expensive power electronic devices, the cost of materials and installation and application of the generator system is reduced, and the difficulty of control is reduced. Furthermore, after eliminating the frequency conversion system, the volume of the generator is greatly reduced, the power density is high, the requirements for the installation environment are reduced, the interference to the outside world is small, and the application range is wider.
附图说明Description of drawings
图1为实施例1的具有定速调频功能的发电机结构示意图。Fig. 1 is a schematic structural diagram of a generator with constant-speed and frequency-regulating functions in Embodiment 1.
图2为实施例1的具有定速调频功能的发电机的定子铁心及第一绕组结构示意图。FIG. 2 is a structural schematic diagram of the stator core and the first winding of the generator with constant-speed and frequency-regulating functions in Embodiment 1. FIG.
图3为实施例1的具有定速调频功能的发电机的定子铁心及第二绕组结构示意图。FIG. 3 is a structural schematic diagram of the stator core and the second winding of the generator with constant-speed and frequency-regulating functions in Embodiment 1. FIG.
图4为实施例1的具有定速调频功能的发电机的转子结构示意图。FIG. 4 is a schematic diagram of the rotor structure of the generator with constant-speed and frequency-regulating function in Embodiment 1. FIG.
图5为实施例2的具有定速调频功能的发电机结构示意图。Fig. 5 is a structural schematic diagram of a generator with constant speed and frequency regulation function in Embodiment 2.
图6为实施例2的具有定速调频功能的发电机的定子结构示意图。Fig. 6 is a schematic structural diagram of the stator of the generator with constant-speed and frequency-regulating functions in Embodiment 2.
图7为实施例2的具有定速调频功能的发电机的转子结构示意图。Fig. 7 is a schematic diagram of the rotor structure of the generator with constant-speed and frequency-regulating function in Embodiment 2.
图8为实施例3的具有定速调频功能的发电机结构示意图。Fig. 8 is a schematic structural diagram of a generator with constant-speed and frequency-regulating functions in Embodiment 3.
图9为实施例3的具有定速调频功能的发电机的定子结构示意图。Fig. 9 is a schematic structural diagram of the stator of the generator with constant-speed and frequency-regulating functions in Embodiment 3.
图10为实施例3的具有定速调频功能的发电机的转子结构示意图。Fig. 10 is a schematic diagram of the rotor structure of the generator with constant-speed and frequency-regulating function in Embodiment 3.
具体实施方式detailed description
下面结合实施例对本发明作进一步说明,但不作为对本发明的限定。The present invention will be further described below in conjunction with the examples, but not as a limitation of the present invention.
实施例1,请参照图1至图4所示,本实施例涉及了一种具有定速调频功能的发电机,其额定功率为3000W,额定转速为5400r/min。具有定速调频功能的发电机包括有一个定子100和一个转子101,定子100设置在转子101外围,为外定子100内转子101 结构。Embodiment 1, please refer to Fig. 1 to Fig. 4, this embodiment relates to a generator with constant speed and frequency modulation function, its rated power is 3000W, and its rated speed is 5400r/min. The generator with constant speed and frequency modulation function includes a
定子100包括由0.35mm无取向硅钢片叠压而成的定子铁心1001,以及在定子铁心1001上绕设的两组三相绕组,即第一绕组1002和第二绕组1003。定子铁心1001沿周向开有18个均匀分布的槽1001a,开槽1001a形成的18个定子齿1001b上按内外层分别绕制第一绕组1002和第二绕组1003。第一绕组1002绕制为外圈,其包含9个线圈,每个第一绕组1002的线圈横跨两个定子齿1001b,第一绕组1002的线圈的节距为2,匝数为12,构成一个6极9槽绕组,如图2所示。第二绕组1003绕制为内圈,相比第一绕组1002更接近转子101,同样包含9个线圈,第二绕组1003的线圈横跨两个定子齿1001b,节距为2,匝数为15,构成一个8极9槽绕组,如图3所示。The
请结合图4所示,发电机的转子101位于定子100内部,包括转轴1011以及围绕转轴1011并在转轴1011周向布置的第一转子磁极组1012和第二转子磁极组1013。转轴1011由45#导磁钢加工制造,连接柴油机输出轴上。第一转子磁极组1012包含6个永磁体,6个永磁体沿圆周均匀分布,贴于转轴1011的外侧,采用径向充磁,磁体极性交错排列,构成6个磁极,第一转子磁极组1012的极数与第一绕组1002的极数相同。As shown in FIG. 4 , the
第二转子磁极组1013包含8个永磁体,8个永磁体沿圆周均匀分布,贴于第一转子磁极组1012的外侧,采用径向充磁,磁体极性交错排列,构成8个磁极,第二转子磁极组1013的极数与第二绕组1003的极数相同。在本实施例中,第二转子磁极组1013 的外侧套有不导磁的护套1014,护套1014由Inconel 718合金钢制作。The second
作为一个优选的实施方式,可以将第二转子101磁极组设置为一个完整的磁环,如此通过第二转子101磁极组限制第一转子101磁极组的径向位置从而可以不需要再额外设置不导磁的护套。As a preferred embodiment, the magnetic pole group of the
作为另一个优选的实施方式,第一转子磁极组1012以及第二转子磁极组1013所采用的永磁体可全部替换为直流励磁绕组。第一转子磁极组1012的直流励磁绕组通电时,第二转子磁极组1013的直流励磁绕组设置为开路状态。第二转子磁极组1013的直流励磁绕组通电时,第一转子磁极组1012的直流励磁绕组设置为开路状态。通过设置两套直流励磁绕组的通断状态,使转子直流励磁绕组的电流与发电机负载转矩同步变化,增强发电机转速和频率的稳定性。亦或者将第一转子磁极组1012和第二转子磁极组1013 中的任一个所采用的永磁体替换为直流励磁绕组。As another preferred implementation manner, the permanent magnets used in the first
本实施例的具有定速调频功能的发电机运行过程中,柴油机输出轴连接到转子101 的转轴,转子101旋转,第一转子磁极组1012在第一绕组1002中感应出频率为270Hz 的三相交流电压,第二转子磁极组1013在第二绕组1003中感应出频率为360Hz的三相交流电压。采用开关在第一绕组1002和第二绕组1003中切换,即实现恒定转速两级调频功能,驱动不同频率要求的负载。During the operation of the generator with constant speed and frequency modulation function in this embodiment, the output shaft of the diesel engine is connected to the rotating shaft of the
实施例2,请结合图5至图7所示,具有定速调频功能的发电机的另一种结构包括有一个定子200和一个转子201,定子200设置在转子201内部,为外转子内定子结构。Embodiment 2, please refer to Fig. 5 to Fig. 7, another structure of the generator with constant speed and frequency modulation function includes a
定子200包括定子铁心2001,以及在定子铁心2001上绕设的两组三相绕组,即第一绕组2002和第二绕组2003。定子铁心2001的外周面沿周向开设均匀分布的槽2001a,槽2001a之间形成的定子齿2001b上绕制第一绕组2002和第二绕组2003。其中第一绕组2002靠近定子铁心2001中心为内圈绕组,第二绕组2003绕制为外圈绕组。The
发电机的转子201为筒状,环绕在位于定子200外,包括护套2011,并在护套2011内侧周向布置第一转子磁极组2012和第二转子磁极组2013。转子201的转轴(图上未示出)与护套2011同轴布置并与护套2011固定,其由柴油机驱动。第一转子磁极组 2012包含8个径向充磁的永磁体,8个永磁体贴于护套2011内壁沿圆周均匀分布,第一转子磁极组2012的极数与第一绕组2002的极数相同。第二转子磁极组2013包含6 个径向充磁的永磁体,6个永磁体贴于第一转子磁极组2012的内壁沿圆周均匀分布,第二转子磁极组2013的极数与第二绕组2003的极数相同。由此在转子201受柴油机驱动转动时,在同一转速下,第一绕组2002和第二绕组2003中可以感应出不同频率的交流电压,实现恒定转速两级调频功能,驱动不同频率要求的负载。The
实施例3,请结合图8至图10所示,具有定速调频功能的发电机的又一种结构包括有一个定子300和两个转子,两个转子即第一转子301和第二转子302,定子300设置在第一转子301和第二转子302之间。Embodiment 3, please refer to FIG. 8 to FIG. 10 , another structure of the generator with constant speed and frequency modulation function includes a
定子300包括定子铁心3001,以及在定子铁心3001上绕设的两组三相绕组,即第一绕组3002和第二绕组3003。定子铁心3001的外周面和内周面都沿周向开设均匀分布的外槽3001a和内槽3001b,外槽3001a之间形成的外定子齿3001c上绕制第一绕组 3002,内槽3001b之间形成的内定子齿3001d上绕制第二绕组3003。第一转子301和第二转子302具有同一转轴(图上未示出),第一转子301和第二转子302上的磁极组围绕转轴周向布置。具体地,第一转子301是设置在定子300的外围,包括有外护套3011,在外护套3011内壁沿圆周均匀分布贴设8个径向充磁的永磁体构成第一转子磁极组 3012,其极数与第一绕组3002的极数相同。第二转子302是设置在定子300的内部,包括有转子铁心3021,在转子铁心3021的外壁沿圆周均匀分布贴设6个径向充磁的永磁体构成第二转子磁极组3022,其极数与第二绕组3003的极数相同。柴油机的驱动轴与转轴连接后同时驱动第一转子301和第二转子302转动,由此在第一绕组3002和第二绕组3003中可以感应出不同频率的交流电压,实现恒定转速两级调频功能,驱动不同频率要求的负载。The
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