WO2020114254A1 - Rotor for doubly-fed wind generator - Google Patents

Rotor for doubly-fed wind generator Download PDF

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Publication number
WO2020114254A1
WO2020114254A1 PCT/CN2019/119647 CN2019119647W WO2020114254A1 WO 2020114254 A1 WO2020114254 A1 WO 2020114254A1 CN 2019119647 W CN2019119647 W CN 2019119647W WO 2020114254 A1 WO2020114254 A1 WO 2020114254A1
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WO
WIPO (PCT)
Prior art keywords
winding
space
rotor
width
slot
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PCT/CN2019/119647
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French (fr)
Chinese (zh)
Inventor
崔皓
张广兴
段志强
霍永强
刘军婷
池佃旭
Original Assignee
中车永济电机有限公司
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Publication of WO2020114254A1 publication Critical patent/WO2020114254A1/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/26Rotor cores with slots for windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Definitions

  • the invention relates to the field of wound rotor motors, in particular to a double-fed wind generator rotor.
  • the doubly-fed wind generator can adjust the phase of its excitation current to adjust the reactive power, adjust the amplitude of the excitation current, and adjust the active power. Power, to achieve independent adjustment of active power and reactive power.
  • the invention provides a doubly-fed wind generator rotor, the rotor slot shape and the formed winding are changed to a T-shaped structure, which solves the problem that the magnetic density of the rotor teeth of the generator is supersaturated when the generator is working under harsh working conditions in the prior art. Increased temperature rise, technical problems that affect the performance of the motor.
  • the invention provides a doubly-fed wind generator rotor, which includes: a rotor slot type and a shaped winding.
  • the rotor slot type is provided with an installation space for installing the shaped winding, and the longitudinal cross section of the installation space is T-shaped.
  • the rotor slot is provided with an opening for the shaped winding to enter the installation space.
  • the installation space includes: a first space and a second space that are in communication, and the first space is close to the opening;
  • the shaped winding includes: an upper winding and a lower winding, and the upper winding is located at the In the first space, the lower winding is located in the second space.
  • the width of the opening is greater than or equal to 1/2 of the width of the installation space and smaller than the width of the installation space.
  • the width of the first space is greater than the width of the second space, and the width of the first space is twice the width of the upper winding, and the width of the second space is the width of the lower winding Twice.
  • the height of the upper layer winding is smaller than the height of the lower layer winding
  • the width of the upper layer winding is greater than the width of the lower layer winding
  • the cross-sectional areas of the upper layer winding and the lower layer winding are equal.
  • an interlayer cushion strip is provided between the upper layer winding and the lower layer winding, and the interlayer cushion strip has an inverted trapezoid shape.
  • the width of the opening is equal to the width of the installation space.
  • the width of the first space is equal to the width of the upper winding
  • the width of the second space is equal to the width of the lower winding
  • a plug block which is used to connect the upper layer winding and the lower layer winding.
  • a first groove and a second groove are provided on the plug block, wherein the bottom end of the upper winding is inserted in the first groove, and the top end of the lower winding is inserted in the In the second groove.
  • the doubly-fed wind power generator rotor includes a rotor slot type and a shaped winding.
  • the rotor slot type is opened on the outer surface of the rotor, and the rotor slot type is provided with an installation space.
  • the shaped winding is installed in the installation space.
  • the longitudinal cross-section of the installation space is T-shaped.
  • the volume near the slot is equal to the end near the bottom of the slot.
  • the shape of the shaped winding matches the installation space.
  • the top is also equal to the bottom.
  • This embodiment provides a T-shaped rotor slot and shaped winding. Compared with the prior art, this embodiment maximizes the cross section of the shaped winding to reduce the rotor electrical density. And rotor DC resistance, thereby reducing losses and temperature rise, so as to maximize the effective use of the motor space, solving the problem that the rotor teeth magnetic density oversaturation and the temperature rise of the generator are too high in the prior art. Technical issues that affect the performance and safety of the entire generator.
  • FIG. 1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art
  • FIG. 2 is another schematic structural diagram of a rotor slot type of a wind turbine rotor in the prior art
  • FIG. 3 is a schematic diagram of a rotor slot structure of another doubly-fed wind generator rotor provided by an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a rectangular slot structure of a wind turbine rotor in the prior art
  • FIG. 5 is a schematic diagram of a structure of a winding of a doubly-fed wind generator rotor provided by an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a semi-open rotor slot type of a wind turbine rotor in the prior art
  • FIG. 7 is a schematic structural diagram of a semi-open rotor slot type of a doubly-fed wind generator rotor provided by an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a plug block structure of a doubly-fed wind generator rotor provided by an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a plug block structure of a wind turbine rotor in the prior art.
  • FIG. 1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art
  • FIG. 2 is another schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art
  • FIG. 3 is provided by an embodiment of the present invention 4 is a schematic diagram of a rotor slot structure of a doubly-fed wind generator rotor
  • FIG. 4 is a schematic diagram of a rectangular slot structure of a wind generator rotor in the prior art
  • FIG. 5 is a doubly-fed wind power generation provided by an embodiment of the present invention Schematic diagram of the structured winding of the machine rotor
  • FIG. 1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art
  • FIG. 2 is another schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art
  • FIG. 6 is a structural diagram of a semi-open rotor slot type of a wind turbine rotor in the prior art
  • FIG. 7 is a diagram of a double-fed wind turbine rotor provided by an embodiment of the present invention. Schematic diagram of the semi-open rotor slot structure
  • FIG. 8 is a schematic diagram of a plug structure of a doubly-fed wind generator rotor provided by an embodiment of the present invention
  • FIG. 9 is a plug structure of a wind generator rotor in the prior art schematic diagram.
  • This embodiment provides a doubly-fed wind generator rotor 1, which includes a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is a groove formed on the rotor sheet, and the rotor slot 10 is provided with a mounting and shaping In the installation space 11 of the winding 20, the shaped winding 20 is placed in the rotor slot 10. When the rotor of the motor moves, the shaped winding 20 moves with the rotor.
  • the longitudinal cross-section of the installation space 11 is T-shaped, that is, the installation space 11 is A T-shaped space with a large top and a small bottom, an opening above the installation space 11 and the opening communicating with the slot of the rotor slot 10, through which the shaped winding 20 enters the installation space 11 and is placed in the installation space 11 in.
  • the overall shape of the rotor slot 10 is T-shaped.
  • the difference in the shape of the rotor slot 10 directly affects the shape of the shaped winding 20.
  • the size and area of the shaped winding 20 are the same as those of the shaped winding 20.
  • Magnetic flux and performance are directly related.
  • rectangular slots 50 are mostly used for forming winding punches, and the upper and lower windings are formed by winding copper bus bars of equal cross section
  • the rotor slot type is a rectangular slot 50, and the shaped winding will be correspondingly wound into a rectangular shape.
  • L1 is equal to L2 in the upper and lower windings.
  • This slot type and winding scheme when the generator runs at a low voltage (eg: 0.85 Times the rated voltage), under severe working conditions with low power factor (eg -0.894), due to the large generator capacity, the rotor current rises much, the rotor winding density is high, the overall machine loss increases, and the generator temperature rises High, therefore, the performance of the motor will be severely affected by the high temperature when this slot type and winding scheme are responding to harsh working conditions.
  • the rectangular slot 50 needs to be changed without changing the motor volume.
  • the rotor slot 10 and the shaped winding 20 are adjusted in this embodiment.
  • a non-standard T-slot is used above the T-slot
  • the lower part is larger, and the corresponding shaped winding 20 installed therein will also change shape accordingly.
  • the shaped winding 20 needs to match the shape of the rotor slot 10, if the gap between the shaped winding 20 and the rotor slot 10 is too large If it is too large, the magnetic flux of the rotor will be lost, which affects the performance of the motor. Therefore, compared with the prior art, the shape of the shaped winding 20 of the present application will also change accordingly.
  • This embodiment provides a doubly-fed wind generator rotor 1, which includes a rotor slot 10 and a shaped winding 20.
  • the rotor slot 10 is opened on the outer surface of the rotor.
  • the rotor slot 10 is provided with an installation space 11 and the shaped winding 20 is installed.
  • the longitudinal cross-section of the installation space 11 is T-shaped, and the volume near the slot end is equal to the end near the slot bottom, the shape of the shaped winding 20 matches the installation space 11, and the top is equal to the bottom, when the rotor moves At this time, the formed winding 20 moves with the rotor in the rotor slot 10, in order to ensure the safe and reliable mechanical strength of the rotor blade and the magnetic density of the teeth without increasing the volume of the motor within the space of the existing structural size In the narrowest position, there is no problem of oversaturation.
  • This embodiment provides a T-shaped rotor slot 10 and a shaped winding 20. Compared with the prior art, this embodiment maximizes the cross section of the shaped winding to reduce The small rotor's electric density and the rotor's DC resistance reduce the loss and temperature rise, and maximize the effective use of the motor space.
  • the installation space 11 includes: a first space 111 and a second space 112, wherein the first space 111 and the second space 112 communicate with each other, and the installation space 11 is located In the rotor slot 10, the rotor slot 10 is a T-shaped groove, the end near the slot opening in the installation space 11 is the first space 111, the end near the slot bottom is the second space 112, and the second space 112 is closed below,
  • the upper space communicates with the first space 111
  • the lower space 111 communicates with the second space 112
  • the upper space communicates with the slot of the rotor slot 10.
  • the shaped winding 20 includes: an upper winding 21 and a lower winding 22, the upper winding 21 is located at In a space 111, the lower winding 22 is located in the second space 112, the size of the upper winding 21 and the first space 111 match each other, and the size of the lower winding 22 and the second space 112 match each other, that is, the upper winding 21 and
  • the shape of the lower winding 22 is changed correspondingly with the size of the first space 111 and the second space 112, so that the upper winding 21 becomes wider, but the surface area of the upper winding 21 and the lower winding 22 is equal, that is, the upper winding 21 and The length of the copper wire of the lower winding 22 is equal, and the copper consumption of the upper winding 21 and the lower winding 22 is the same, but in form, the upper winding 21 is wider in width and shorter in height than the lower winding 22, but the upper layer Both the winding 21 and the lower winding 22 have the same surface area.
  • This embodiment provides a doubly-fed wind generator rotor 1, including a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is provided with an installation space 11, the shaped winding 20 is installed in the installation space 11, the rotor slot
  • the width of the opening 10 is greater than or equal to half the width of the installation space 11.
  • This rotor slot type 10 is a semi-open rotor slot type 10, that is, the slot of the rotor slot type 10, that is, the opening is only half the size of the installation space 11.
  • the lateral cross-sectional area of the first space 111 is greater than the lateral cross-sectional area of the second space 112, the volume and area of the first space 111 and the second space 112 are the same, but the first space 111 is in the lateral direction
  • the cross-sectional area of the cross-section is larger than the cross-sectional area of the second space 112. It can be understood that the first space 111 is wider than the second space 112. In terms of width, the first space 111 is wider than the second space 112. In terms of height, the first space 111 is lower than the second space 112.
  • the first space 111 is larger than the second space 112
  • the overall installation space 11 is T-shaped, and the upper part is larger than the lower part, but in fact,
  • the area and volume of the first space 111 and the second space 112 are equal, but differ in length and width.
  • the width of the first space 111 is twice that of the upper winding 21, and the width of the second space 112 is the lower Twice the winding 22, that is, the first space 111 can accommodate two upper windings 21, and the second space 112 can accommodate two lower windings 22, wherein the upper winding 21 and the lower winding 22 are placed in the first space 111 In the second space 112, the distance between the upper winding 21 and the first space 111 and between the lower winding 22 and the second space 112 cannot be too large, otherwise the efficiency of the motor will be affected.
  • the height of the upper winding 21 is smaller than the length of the lower winding 22, and the width of the upper winding 21 is larger than the width of the lower winding 22, that is, the height of the upper winding 21 is lower than that of the lower winding 22
  • the width becomes wider, and at the same time, the area of the upper winding 21 and the lower winding 22 is the same, that is, the length of the copper wire used to wind the upper winding 21 and the lower winding finger is the same, the upper winding 21 and the lower winding 22 are only different in length and width.
  • the overall cross-sectional area is the same.
  • the specifications of the upper and lower windings are generally the same, which also depends on the specific shape of the slot type.
  • the rectangular slot 50 is generally used, so the upper and lower windings Generally, it is a rectangle with the same size and shape.
  • the generator equipped with a rectangular slot 50 under severe working conditions, especially when low voltage (such as: 0.85 times the rated voltage) and low power factor (such as: -0.8894), will appear due to
  • the large generator capacity leads to the phenomenon that the rotor current rises much and the rotor winding has a high electrical density. This will lead to an increase in the overall loss of the generator.
  • the temperature of the generator will increase, and the generator will continue to dissipate heat during operation. With the increase in temperature rise, the speed of the generator temperature will continue to increase and exceed the heat dissipation of the generator itself, which causes the problem of the generator to increase continuously.
  • the temperature has a serious impact on the function of the generator itself, usually in order to cope with the harsh environment.
  • the problem of temperature rise caused by increasing the size of the generator to increase the capacity of the generator is a conventional solution, but increasing the capacity of the generator will inevitably cause an increase in cost.
  • the rectangular slot 50 needs to be improved, but simply The deepening or widening of the rectangular slot 50 will narrow the tooth root of the rotor, resulting in super saturation of the rotor magnetic density and poor mechanical strength of the rotor teeth, which affects the performance and safety of the entire motor. This is due to simple deepening or widening
  • the rectangular slot 50 will also change the shape of the upper and lower windings. In this embodiment, although the shape of the rotor slot 10 and the shaped winding 20 is changed, the overall cross-sectional area has not changed.
  • H1 is equal to H2
  • B1 is equal to B2
  • Bt2 is greater than or equal to Bt1
  • an interlayer pad 30 is provided between the upper winding 21 and the lower winding 22, and in the semi-open rotor slot 10, the first space 111 and the second space 112 It can accommodate two upper windings 21 and two lower windings 22 respectively. There is no need to separate any objects between the two upper windings 21 or the two lower windings 22, but between the upper winding 21 and the lower winding 22
  • the interlayer pad 30 needs to be used.
  • the interlayer pad 30 has an inverted trapezoid shape. The length of the side of the interlayer pad 30 contacting the upper winding 21 is longer than the side contacting the lower layer winding 22.
  • the interlayer pad 30 connects the upper winding 21 and the lower layer. The gap between the windings 22 is filled to avoid the phenomenon that the insulating paint is lost due to the gap being too large and the space cannot be filled.
  • the rotor slot type 10 is a semi-open type, and the semi-open type rotor slot type 10 is directed to a semi-open type rectangular slot in the prior art 50.
  • the internal space of the slot body is improved.
  • the rectangular slot 50 is changed to a T-shaped slot, and the T-shaped rotor slot 10 Compared with the second space 112, the first space 111 has a larger width but a lower height.
  • the upper winding 21 is wider than the lower winding 22 but has a lower height.
  • FIG. 6 is a rectangular slot 50 of the prior art
  • FIG. 7 is based on The rotor slot 10 provided in the embodiment, wherein C1 is equal to C2, Bc1 is larger than Bd1, and Bc2 is smaller than Bd2.
  • This embodiment provides a doubly-fed wind generator rotor 1, including a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is provided with an installation space 11, the shaped winding 20 is installed in the installation space 11, the rotor slot
  • the width of the opening 10 is equal to the width of the installation space 11.
  • This rotor slot 10 is a full-open rotor slot 10, that is, the slot of the rotor slot 10, that is, the size of the opening and the installation space 11 are the same.
  • the width of the first space 111 in the installation space 11 is equal to the width of the upper winding 21
  • the width of the second space 112 is equal to the width of the lower winding 22
  • the installation space 11 in the fully open rotor slot type 10 Only one upper winding 21 can be accommodated in the first space 111 in the interior, and only one lower winding 22 can be accommodated in the second space 112.
  • the width of the upper winding 21 is greater than the width of the lower winding 22, and the height of the upper winding 21 is lower than that of the lower winding 22 the height of.
  • a plug block 40 is provided between the upper winding 21 and the lower winding 22, and the plug 40 connects the upper winding 21 and the lower winding 22 together, so that the upper winding 21 and the lower winding 22 Make contact.
  • the plug block 40 is located between the upper winding 21 and the lower winding 22, the plug block 40 is provided with a first groove and a second groove, and the bottom of the upper winding 21 The end is inserted into the first groove, and the top end of the lower winding 22 is inserted into the second groove.
  • the rotor slot type 10 is a fully open type, and the fully open type rotor slot type 10 is improved on the basis of the open rectangular slot 50 in the prior art, which is different from the prior art Compared with the rectangular slot 50 in the middle, the overall accommodation space size of the rotor slot 10 has not changed, the surface area and capacity of the upper winding 21 and the lower winding 22 have not changed, but the aspect ratio has changed, and at the same time, the plug 40 As shown in FIG. 9, the standard I-shaped plug pad 60 is used in the prior art.
  • the I-shaped plug 40 is actually It is a non-standard I-shape with a width of the first groove larger than that of the second groove.
  • the formed winding 20 provided in this embodiment is specifically compared with the existing rectangular groove 50
  • the wire cross section of the shaped winding 20 is increased to 1.235 times, the electrical density of the rotor is reduced to 0.81 times of the existing rectangular slot 50, and the corresponding rotor copper consumption is reduced to 0.85 times of the existing rectangular slot 50 under the worst conditions.
  • the terms “installation”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , Or integrated; can be mechanical connection, electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction between two components.
  • installation can be a fixed connection or a detachable connection , Or integrated; can be mechanical connection, electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction between two components.

Abstract

Provided is a rotor for a doubly-fed wind generator, the rotor comprising: a shaped rotor slot and a preformed winding, wherein the shaped rotor slot is provided with an installation space for installing the preformed winding, a longitudinal cross section of the installation space has a T-shape, and the shaped rotor slot is provided with an opening for inserting the preformed winding into the installation space. In the rotor for a doubly-fed wind generator provided by the present invention, the shape of the shaped rotor slot and the preformed winding is modified on the basis of the prior art; and a T-shaped rotor slot and a corresponding preformed winding are adopted to prevent the technical problem in which the over-saturated magnetic density of rotor teeth and an elevated temperature increase of the generator affect motor performance when a wind generator is operating in poor operation conditions.

Description

一种双馈风力发电机转子Rotor of doubly-fed wind generator 技术领域Technical field
本发明涉及绕线式转子电机领域,尤其涉及一种双馈风力发电机转子。The invention relates to the field of wound rotor motors, in particular to a double-fed wind generator rotor.
背景技术Background technique
近年来,双馈风力发电机广泛应用在大中型风力发电机组中,在国内运行的双馈风力发电机中,其电网的运行环境中要求,电压运行范围为额定电压±10%,功率因数为-0.95~1~0.95。但随着国内风力发电机逐步趋于饱和,风力发电走向海外市场已迫在眉睫,不过国外部分电网质量较为恶劣,通常要求发电机运行电压范围为额定电压±15%,功率因数为-0.894~1~0.838。恶劣的电网环境导致同样额定功率的发电机,在恶劣工况下运行时,不仅需提供较大的无功功率,还需要具备更大的容量。In recent years, doubly-fed wind turbines are widely used in large and medium-sized wind turbines. In domestically operated doubly-fed wind turbines, the operating environment of the power grid requires that the voltage operating range be rated voltage ± 10% and the power factor is -0.95~1~0.95. However, with the gradual saturation of domestic wind turbines, it is imminent for wind power generation to go to overseas markets. However, the quality of some foreign power grids is relatively poor, and the operating voltage range of the generator is usually required to be ±15% of the rated voltage, and the power factor is -0.894~1~ 0.838. The harsh power grid environment leads to generators with the same rated power, which not only need to provide larger reactive power but also have larger capacity when operating under harsh working conditions.
目前,解决上述问题的方法就是增大发电机组的体积增大容量,双馈风力发电机本身可以通过调节自身的励磁电流相位来调解发出的无功功率,调节励磁电流幅值,调节发出的有功功率,实现有功功率和无功功率的独立调节。At present, the solution to the above problem is to increase the volume and capacity of the generator set. The doubly-fed wind generator can adjust the phase of its excitation current to adjust the reactive power, adjust the amplitude of the excitation current, and adjust the active power. Power, to achieve independent adjustment of active power and reactive power.
然而,在上述解决方法中,增加发电机的体积会导致电机成本增加,而双馈风力发电机调节无功功率时,转子绕组的结构起到重要影响,现有双馈风力发电机设计中,成型绕组冲片多采用矩形槽,上层绕组和下层绕组采用等截面铜母线绕制成型后嵌入槽内,槽中上、下层绕组间采用矩形层间垫条隔开,线圈连接采用“工”字型塞块焊接相连,这种设计当发电机运行在低电压、低功率因数的恶劣工况下时,容易造成发电机温升过高,为了降温,需要将矩形槽加宽或加深,这样会使转子齿根部变窄,导致转子齿磁密过饱和且转子齿机械强度变差,影响整个电机性能和安全。However, in the above solution, increasing the size of the generator will increase the cost of the motor. When the reactive power of the doubly-fed wind generator is adjusted, the structure of the rotor winding plays an important role. In the design of the existing doubly-fed wind generator, The shaped winding punches mostly use rectangular slots, and the upper and lower windings are made of copper wires of equal cross-section and embedded in the slots. The upper and lower windings in the slots are separated by rectangular interlayer pads, and the coil connection is "worked". The shape plugs are connected by welding. When the generator is operated under the harsh working conditions of low voltage and low power factor, it is easy to cause the temperature of the generator to rise too high. In order to reduce the temperature, the rectangular slot needs to be widened or deepened. It will make the root of the rotor teeth narrow, resulting in super saturation of the magnetic density of the rotor teeth and poor mechanical strength of the rotor teeth, affecting the performance and safety of the entire motor.
发明内容Summary of the invention
本发明提供一种双馈风力发电机转子,将转子槽型和成型绕组改为T 型结构,解决现有技术中当工作在恶劣工况下,发电机的转子齿磁密度过饱和,发电机温升提高,影响电机性能的技术问题。The invention provides a doubly-fed wind generator rotor, the rotor slot shape and the formed winding are changed to a T-shaped structure, which solves the problem that the magnetic density of the rotor teeth of the generator is supersaturated when the generator is working under harsh working conditions in the prior art. Increased temperature rise, technical problems that affect the performance of the motor.
本发明提供一种双馈风力发电机转子,包括:转子槽型和成型绕组,所述转子槽型内设有用于安装成型绕组的安装空间,且所述安装空间的纵向截面呈T型,所述转子槽型上开设可供所述成型绕组进入所述安装空间的开口。The invention provides a doubly-fed wind generator rotor, which includes: a rotor slot type and a shaped winding. The rotor slot type is provided with an installation space for installing the shaped winding, and the longitudinal cross section of the installation space is T-shaped. The rotor slot is provided with an opening for the shaped winding to enter the installation space.
进一步地,所述安装空间包括:相连通的第一空间和第二空间,且所述第一空间靠近所述开口;所述成型绕组包括:上层绕组和下层绕组,所述上层绕组位于所述第一空间内,所述下层绕组位于所述第二空间内。Further, the installation space includes: a first space and a second space that are in communication, and the first space is close to the opening; the shaped winding includes: an upper winding and a lower winding, and the upper winding is located at the In the first space, the lower winding is located in the second space.
进一步地,所述开口的宽度大于等于所述安装空间宽度的1/2且小于所述安装空间的宽度。Further, the width of the opening is greater than or equal to 1/2 of the width of the installation space and smaller than the width of the installation space.
进一步地,所述第一空间的宽度大于所述第二空间的宽度,且所述第一空间的宽度为所述上层绕组宽度的2倍,所述第二空间的宽度为所述下层绕组宽度的2倍。Further, the width of the first space is greater than the width of the second space, and the width of the first space is twice the width of the upper winding, and the width of the second space is the width of the lower winding Twice.
进一步地,所述上层绕组的高度小于所述下层绕组的高度,所述上层绕组的宽度大于所述下层绕组的宽度,且所述上层绕组和所述下层绕组的截面面积相等。Further, the height of the upper layer winding is smaller than the height of the lower layer winding, the width of the upper layer winding is greater than the width of the lower layer winding, and the cross-sectional areas of the upper layer winding and the lower layer winding are equal.
进一步地,所述上层绕组和所述下层绕组之间设有层间垫条,所述层间垫条呈倒梯形。Further, an interlayer cushion strip is provided between the upper layer winding and the lower layer winding, and the interlayer cushion strip has an inverted trapezoid shape.
进一步地,所述开口的宽度等于所述安装空间的宽度。Further, the width of the opening is equal to the width of the installation space.
进一步地,所述第一空间的宽度等于所述上层绕组的宽度,所述第二空间的宽度等于所述下层绕组的宽度。Further, the width of the first space is equal to the width of the upper winding, and the width of the second space is equal to the width of the lower winding.
进一步地,还包括:塞块,所述塞块用于将所述上层绕组和所述下层绕组联结。Further, it further includes a plug block, which is used to connect the upper layer winding and the lower layer winding.
进一步地,所述塞块上开设第一凹槽和第二凹槽,其中,所述上层绕组的底端插设在所述第一凹槽中,所述下层绕组的顶端插设在所述第二凹槽中。Further, a first groove and a second groove are provided on the plug block, wherein the bottom end of the upper winding is inserted in the first groove, and the top end of the lower winding is inserted in the In the second groove.
本实施例提供一种双馈风力发电机转子,通过包括转子槽型和成型绕组在内组成的双馈风力发电子转子,转子槽型开设在转子的外表面, 转子槽型中设有安装空间,成型绕组安装在安装空间中,安装空间的纵向截面呈T型,靠近槽口一端的体积等于靠近槽底的一端,成型绕组的形态与安装空间相匹配,同样为上方等于下方,当转子运动时,成型绕组在转子槽型内随着转子一起运动,为了在现有结构尺寸的空间范围内,同时在不增加电机体积的前提下,保证转子冲片机械强度安全可靠以及齿磁密在最窄位置不至于出现过饱和的问题,本实施例提供一种T型转子槽型和成型绕组,与现有技术相比,本实施例尽量加大了成型绕组的截面,以减小转子电密和转子直流电阻,从而减小损耗和降低温升,使电机空间得到最大限度的有效利用,解决了现有技术中发电机在恶劣工况下出现转子齿磁密过饱和,发电机升温过高影响整个发电机的性能和安全的技术问题。This embodiment provides a doubly-fed wind power generator rotor. The doubly-fed wind power generator rotor includes a rotor slot type and a shaped winding. The rotor slot type is opened on the outer surface of the rotor, and the rotor slot type is provided with an installation space. The shaped winding is installed in the installation space. The longitudinal cross-section of the installation space is T-shaped. The volume near the slot is equal to the end near the bottom of the slot. The shape of the shaped winding matches the installation space. The top is also equal to the bottom. When the rotor moves At the time, the forming winding moves with the rotor in the rotor slot, in order to ensure the mechanical strength of the rotor punching sheet is safe and reliable, and the tooth magnetic density is in the most The narrow position does not cause the problem of oversaturation. This embodiment provides a T-shaped rotor slot and shaped winding. Compared with the prior art, this embodiment maximizes the cross section of the shaped winding to reduce the rotor electrical density. And rotor DC resistance, thereby reducing losses and temperature rise, so as to maximize the effective use of the motor space, solving the problem that the rotor teeth magnetic density oversaturation and the temperature rise of the generator are too high in the prior art. Technical issues that affect the performance and safety of the entire generator.
附图说明BRIEF DESCRIPTION
图1为现有技术中风力发电机转子的转子槽型结构示意图;1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art;
图2为现有技术中风力发电机转子的转子槽型的又一结构示意图;2 is another schematic structural diagram of a rotor slot type of a wind turbine rotor in the prior art;
图3为本发明实施例所提供的另一种双馈风力发电机转子的转子槽型结构示意图;3 is a schematic diagram of a rotor slot structure of another doubly-fed wind generator rotor provided by an embodiment of the present invention;
图4为现有技术中风力发电机转子的矩形槽结构示意图;4 is a schematic diagram of a rectangular slot structure of a wind turbine rotor in the prior art;
图5为本发明实施例所提供的一种双馈风力发电机转子的成型绕组结构示意图;5 is a schematic diagram of a structure of a winding of a doubly-fed wind generator rotor provided by an embodiment of the present invention;
图6为现有技术中的风力发电机转子的半开口型转子槽型的结构示意图;6 is a schematic structural diagram of a semi-open rotor slot type of a wind turbine rotor in the prior art;
图7为本发明实施例所提供的一种双馈风力发电机转子的半开口型转子槽型的结构示意图;7 is a schematic structural diagram of a semi-open rotor slot type of a doubly-fed wind generator rotor provided by an embodiment of the present invention;
图8为本发明实施例所提供的一种双馈风力发电机转子的塞块结构示意图;8 is a schematic diagram of a plug block structure of a doubly-fed wind generator rotor provided by an embodiment of the present invention;
图9为现有技术中的风力发电机转子的塞块结构示意图。9 is a schematic diagram of a plug block structure of a wind turbine rotor in the prior art.
附图标记说明:Description of reference signs:
1-双馈风力发电机转子;1- Double-fed wind turbine rotor;
10-转子槽型;10-Rotor geometry;
11-安装空间;11-Installation space;
111-第一空间;111- the first space;
112-第二空间;112-second space;
20-成型绕组;20-shaped winding;
21-上层绕组;21- upper winding;
22-下层绕组;22- Lower layer winding;
30-层间垫条;30-interlayer pads;
40-塞块;40-plug block;
50-矩形槽;50-rectangular slot;
60-工型塞垫块。60-type plug pad.
具体实施方式detailed description
为使本发明的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are Some embodiments of the invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
其中,图1为现有技术中风力发电机转子的转子槽型结构示意图;图2为现有技术中风力发电机转子的转子槽型的又一结构示意图;图3为本发明实施例所提供的另一种双馈风力发电机转子的转子槽型结构示意图;图4为现有技术中风力发电机转子的矩形槽结构示意图;图5为本发明实施例所提供的一种双馈风力发电机转子的成型绕组结构示意图;图6为现有技术中的风力发电机转子的半开口型转子槽型的结构示意图;图7为本发明实施例所提供的一种双馈风力发电机转子的半开口型转子槽型的结构示意图;图8为本发明实施例所提供的一种双馈风力发电机转子的塞块结构示意图;图9为现有技术中的风力发电机转子的塞块结构示意图。Among them, FIG. 1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art; FIG. 2 is another schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art; FIG. 3 is provided by an embodiment of the present invention 4 is a schematic diagram of a rotor slot structure of a doubly-fed wind generator rotor; FIG. 4 is a schematic diagram of a rectangular slot structure of a wind generator rotor in the prior art; FIG. 5 is a doubly-fed wind power generation provided by an embodiment of the present invention Schematic diagram of the structured winding of the machine rotor; FIG. 6 is a structural diagram of a semi-open rotor slot type of a wind turbine rotor in the prior art; FIG. 7 is a diagram of a double-fed wind turbine rotor provided by an embodiment of the present invention. Schematic diagram of the semi-open rotor slot structure; FIG. 8 is a schematic diagram of a plug structure of a doubly-fed wind generator rotor provided by an embodiment of the present invention; FIG. 9 is a plug structure of a wind generator rotor in the prior art schematic diagram.
实施例一Example one
本实施例提供一种双馈风力发电机转子1,包括:转子槽型10和成型绕组20,其中,转子槽型10是开设在转子片上的凹槽,转子槽型10内设有用于安装成型绕组20的安装空间11,成型绕组20被置于转子槽型 10内,当电机的转子运动时,成型绕组20随着转子一起运动,安装空间11的纵向截面呈T型,即安装空间11为一个上方大下方小的T型空间,安装空间11的上方具有开口,且该开口和转子槽型10的槽口连通,成型绕组20通过槽口进入到安装空间11中,被安置在安装空间11中。This embodiment provides a doubly-fed wind generator rotor 1, which includes a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is a groove formed on the rotor sheet, and the rotor slot 10 is provided with a mounting and shaping In the installation space 11 of the winding 20, the shaped winding 20 is placed in the rotor slot 10. When the rotor of the motor moves, the shaped winding 20 moves with the rotor. The longitudinal cross-section of the installation space 11 is T-shaped, that is, the installation space 11 is A T-shaped space with a large top and a small bottom, an opening above the installation space 11 and the opening communicating with the slot of the rotor slot 10, through which the shaped winding 20 enters the installation space 11 and is placed in the installation space 11 in.
需要说明的是,本实施例中,转子槽型10的整体形状是T型,转子槽型10形状的不同直接影响到成型绕组20的形状,成型绕组20的大小和面积都和成型绕组20的磁通量以及性能直接相关,现有的双馈风力发电机设计中,如图1和图2所示,成型绕组冲片多采用矩形槽50,上层绕组和下层绕组采用等截面铜母线绕制成型后嵌入槽内,转子槽型是矩形槽50,成型绕组也会相应的绕成矩形状,上下层绕组中L1等于L2,这种槽型及绕组方案当发电机运行在低电压(如:0.85倍额定电压),低功率因数(如:-0.894)的恶劣工况下时,因发电机容量较大,导致转子电流上升多,转子绕组电密高,整机损耗的增加,发电机温升高,因此,这种槽型和绕组方案在应对恶劣工况时,电机的性能会因为高温而受到严重影响,通常为了降低电机温升,在不改变电机体积的情况下,需要将矩形槽50加宽或加深,但这样会使转子齿根部变窄,导致转子齿磁密过饱和,且转子齿的机械强度变差,影响整个电机性能和安全,而通过直接将发电机体积增大的方式来增大容量会导致电机成本增加。It should be noted that in this embodiment, the overall shape of the rotor slot 10 is T-shaped. The difference in the shape of the rotor slot 10 directly affects the shape of the shaped winding 20. The size and area of the shaped winding 20 are the same as those of the shaped winding 20. Magnetic flux and performance are directly related. In the design of existing doubly-fed wind turbines, as shown in Figs. 1 and 2, rectangular slots 50 are mostly used for forming winding punches, and the upper and lower windings are formed by winding copper bus bars of equal cross section After being inserted into the slot, the rotor slot type is a rectangular slot 50, and the shaped winding will be correspondingly wound into a rectangular shape. L1 is equal to L2 in the upper and lower windings. This slot type and winding scheme when the generator runs at a low voltage (eg: 0.85 Times the rated voltage), under severe working conditions with low power factor (eg -0.894), due to the large generator capacity, the rotor current rises much, the rotor winding density is high, the overall machine loss increases, and the generator temperature rises High, therefore, the performance of the motor will be severely affected by the high temperature when this slot type and winding scheme are responding to harsh working conditions. Generally, in order to reduce the temperature rise of the motor, the rectangular slot 50 needs to be changed without changing the motor volume. Widening or deepening, but this will make the root of the rotor teeth narrow, resulting in super saturation of the rotor teeth magnetic density, and the mechanical strength of the rotor teeth becomes poor, affecting the performance and safety of the entire motor, and by directly increasing the size of the generator To increase the capacity will increase the cost of the motor.
针对现有技术中的上述问题,本实施例中对转子槽型10和成型绕组20进行调整,相较于现有技术中的标准矩形槽50,使用非标准的T型槽,T型槽上方大下方小,相对应的安装在其中的成型绕组20的也会相应的改变形态,成型绕组20需要和转子槽型10的形状相匹配,如果成型绕组20和转子槽型10之间的空隙过大,会导致转子的磁通流失,从而影响到电机的性能,因此,相较于现有技术,本申请的成型绕组20在形态上也会相应的改变。In response to the above problems in the prior art, the rotor slot 10 and the shaped winding 20 are adjusted in this embodiment. Compared with the standard rectangular slot 50 in the prior art, a non-standard T-slot is used above the T-slot The lower part is larger, and the corresponding shaped winding 20 installed therein will also change shape accordingly. The shaped winding 20 needs to match the shape of the rotor slot 10, if the gap between the shaped winding 20 and the rotor slot 10 is too large If it is too large, the magnetic flux of the rotor will be lost, which affects the performance of the motor. Therefore, compared with the prior art, the shape of the shaped winding 20 of the present application will also change accordingly.
本实施例提供一种双馈风力发电机转子1,包括转子槽型10和成型绕组20,转子槽型10开设在转子的外表面,转子槽型10中设有安装空间11,成型绕组20安装在安装空间11中,安装空间11的纵向截面呈T型,靠近槽口一端的体积等于靠近槽底的一端,成型绕组20的形态与安装空间11相匹配,同样为上方等于下方,当转子运动时,成型绕组20在转子 槽型10内随着转子一起运动,为了在现有结构尺寸的空间范围内,同时在不增加电机体积的前提下,保证转子冲片机械强度安全可靠以及齿磁密在最窄位置不至于出现过饱和的问题,本实施例提供一种T型转子槽型10和成型绕组20,与现有技术相比,本实施例尽量加大了成型绕组的截面,以减小转子电密和转子直流电阻,从而减小损耗和降低温升,使电机空间得到最大限度的有效利用。This embodiment provides a doubly-fed wind generator rotor 1, which includes a rotor slot 10 and a shaped winding 20. The rotor slot 10 is opened on the outer surface of the rotor. The rotor slot 10 is provided with an installation space 11 and the shaped winding 20 is installed. In the installation space 11, the longitudinal cross-section of the installation space 11 is T-shaped, and the volume near the slot end is equal to the end near the slot bottom, the shape of the shaped winding 20 matches the installation space 11, and the top is equal to the bottom, when the rotor moves At this time, the formed winding 20 moves with the rotor in the rotor slot 10, in order to ensure the safe and reliable mechanical strength of the rotor blade and the magnetic density of the teeth without increasing the volume of the motor within the space of the existing structural size In the narrowest position, there is no problem of oversaturation. This embodiment provides a T-shaped rotor slot 10 and a shaped winding 20. Compared with the prior art, this embodiment maximizes the cross section of the shaped winding to reduce The small rotor's electric density and the rotor's DC resistance reduce the loss and temperature rise, and maximize the effective use of the motor space.
进一步地,在本实施例中,如图3所示,安装空间11包括:第一空间111和第二空间112,其中,第一空间111和第二空间112之间相互连通,安装空间11位于转子槽型10内,转子槽型10为一T型凹槽,安装空间11中靠近槽口的一端为第一空间111,靠近槽底的一端为第二空间112,第二空间112下方封闭,上方与第一空间111相连通,第一空间111下方与第二空间112连通,上方与转子槽型10的槽口连通,成型绕组20包括:上层绕组21和下层绕组22,上层绕组21位于第一空间111内,下层绕组22位于第二空间112内,上层绕组21和第一空间111之间大小相互匹配,下层绕组22和第二空间112之间大小相互匹配,也就是说上层绕组21和下层绕组22在形态上配合第一空间111和第二空间112的大小有了相应的改变,使得上层绕组21变宽,但是上层绕组21和下层绕组22的表面积相等,即绕成上层绕组21和下层绕组22的铜线长度相等,上层绕组21和下层绕组22的铜耗相同,只是在形态上,上层绕组21相对比下层绕组22的在宽度上变宽了在高度上变矮了,但是上层绕组21和下层绕组22两者的表面积相同。Further, in this embodiment, as shown in FIG. 3, the installation space 11 includes: a first space 111 and a second space 112, wherein the first space 111 and the second space 112 communicate with each other, and the installation space 11 is located In the rotor slot 10, the rotor slot 10 is a T-shaped groove, the end near the slot opening in the installation space 11 is the first space 111, the end near the slot bottom is the second space 112, and the second space 112 is closed below, The upper space communicates with the first space 111, the lower space 111 communicates with the second space 112, and the upper space communicates with the slot of the rotor slot 10. The shaped winding 20 includes: an upper winding 21 and a lower winding 22, the upper winding 21 is located at In a space 111, the lower winding 22 is located in the second space 112, the size of the upper winding 21 and the first space 111 match each other, and the size of the lower winding 22 and the second space 112 match each other, that is, the upper winding 21 and The shape of the lower winding 22 is changed correspondingly with the size of the first space 111 and the second space 112, so that the upper winding 21 becomes wider, but the surface area of the upper winding 21 and the lower winding 22 is equal, that is, the upper winding 21 and The length of the copper wire of the lower winding 22 is equal, and the copper consumption of the upper winding 21 and the lower winding 22 is the same, but in form, the upper winding 21 is wider in width and shorter in height than the lower winding 22, but the upper layer Both the winding 21 and the lower winding 22 have the same surface area.
实施例二Example 2
本实施例提供一种双馈风力发电机转子1,包括转子槽型10和成型绕组20,其中,转子槽型10中设有安装空间11,成型绕组20安装在安装空间11内,转子槽型10开口的宽度大于或等于安装空间11宽度的一半,这种转子槽型10为半开口型转子槽型10,即转子槽型10的槽口,也就是开口只有安装空间11的一半大小。This embodiment provides a doubly-fed wind generator rotor 1, including a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is provided with an installation space 11, the shaped winding 20 is installed in the installation space 11, the rotor slot The width of the opening 10 is greater than or equal to half the width of the installation space 11. This rotor slot type 10 is a semi-open rotor slot type 10, that is, the slot of the rotor slot type 10, that is, the opening is only half the size of the installation space 11.
进一步地,在本实施例中,第一空间111的横向截面面积大于第二空间112的横向截面面积,第一空间111和第二空间112的体积和面积都相同,但是第一空间111在横向截面时,其横截面的面积大于第二空间112 的横截面面积,可以理解为,第一空间111相较于第二空间112,在宽度上,第一空间111比第二空间112宽,在高度上,第一空间111比第二空间112要低,因此,在纵向截面来看,第一空间111大于第二空间112,整体安装空间11呈T型,上方大下方小,但是实际上,第一空间111和第二空间112的面积和体积都相等,只是在长度和宽度上有所不同,同时,第一空间111的宽度为上层绕组21的2倍,第二空间112的宽度为下层绕组22的2倍,也就是说,第一空间111能够容纳两个上层绕组21,第二空间112能够容纳两个下层绕组22,其中,上层绕组21和下层绕组22被置于第一空间111和第二空间112内时,上层绕组21和第一空间111之间以及下层绕组22和第二空间112之间的间距不能过大,否则会影响电机的效率。Further, in this embodiment, the lateral cross-sectional area of the first space 111 is greater than the lateral cross-sectional area of the second space 112, the volume and area of the first space 111 and the second space 112 are the same, but the first space 111 is in the lateral direction The cross-sectional area of the cross-section is larger than the cross-sectional area of the second space 112. It can be understood that the first space 111 is wider than the second space 112. In terms of width, the first space 111 is wider than the second space 112. In terms of height, the first space 111 is lower than the second space 112. Therefore, in the longitudinal section, the first space 111 is larger than the second space 112, the overall installation space 11 is T-shaped, and the upper part is larger than the lower part, but in fact, The area and volume of the first space 111 and the second space 112 are equal, but differ in length and width. At the same time, the width of the first space 111 is twice that of the upper winding 21, and the width of the second space 112 is the lower Twice the winding 22, that is, the first space 111 can accommodate two upper windings 21, and the second space 112 can accommodate two lower windings 22, wherein the upper winding 21 and the lower winding 22 are placed in the first space 111 In the second space 112, the distance between the upper winding 21 and the first space 111 and between the lower winding 22 and the second space 112 cannot be too large, otherwise the efficiency of the motor will be affected.
进一步地,在本实施例中,上层绕组21的高度小于下层绕组22的长度,上层绕组21的宽度大于下层绕组22的宽度,也就是说,上层绕组21相较于下层绕组22,高度变低宽度变宽,同时,上层绕组21和下层绕组22的面积相同,即绕成上层绕组21和下层绕指所耗费的铜线长度相同,上层绕组21和下层绕组22只是在长和宽上不同,整体的截面面积是相同的。Further, in this embodiment, the height of the upper winding 21 is smaller than the length of the lower winding 22, and the width of the upper winding 21 is larger than the width of the lower winding 22, that is, the height of the upper winding 21 is lower than that of the lower winding 22 The width becomes wider, and at the same time, the area of the upper winding 21 and the lower winding 22 is the same, that is, the length of the copper wire used to wind the upper winding 21 and the lower winding finger is the same, the upper winding 21 and the lower winding 22 are only different in length and width. The overall cross-sectional area is the same.
需要说明的是,现有技术中,如图3和图4所示,上下绕组的规格一般都是一致的,这也取决于槽型的具体形状,一般采用的是矩形槽50,因此上下绕组一般也为大小形态完全相同的矩形,配置矩形槽50的发电机在恶劣工况下,尤其是低电压(如:0.85倍额定电压)和低功率因数(如:-0.894)时,会出现因发电机容量较大,导致转子电流上升多,转子绕组电密高的现象,这会导致发电机整机的损耗增加,发电机温升高,发电机在运行过程中会不断进行散热,但是随着温升的提高,发电机温度的提升速度会不断增加并超过发电机本身的散热量,使得发电机的问题不断升高,温度对发电机自身的机能造成严重影响,通常为了应对因恶劣环境造成的温升问题,增大发电机的体积来增加发电机的容量是常规的解决方法,但是增大发电机的容量必然会造成成本的增加,因此就需要对矩形槽50进行改进,但是单纯的加深或加宽矩形槽50会使转子的齿根部变窄,导致转子磁密度过饱和,转子齿的机械强度变差,从而影响整 个电机的性能和安全,这是由于单纯的加深或加宽矩形槽50会使得上下绕组的形态也同样发生变化,本实施例中,虽然改变了转子槽型10和成型绕组20的形状,但是整体的截面积并没有改变,上层绕组21和下层绕组22的长宽比例有所变化,但是与原来相比上层绕组21和下层绕组22自身的表面积并没有变化,也就是说上层绕组21和下层绕组22自身的磁通量并没有发生变化,发电机的性能不变,只是改变上层绕组21和下层绕组22的比例,图3和图4中,H1等于H2,B1等于B2,Bt2大于或等于Bt1,这样能够避免出现转子磁密度过饱和,齿根部机械强度变差的问题。It should be noted that in the prior art, as shown in FIGS. 3 and 4, the specifications of the upper and lower windings are generally the same, which also depends on the specific shape of the slot type. The rectangular slot 50 is generally used, so the upper and lower windings Generally, it is a rectangle with the same size and shape. The generator equipped with a rectangular slot 50 under severe working conditions, especially when low voltage (such as: 0.85 times the rated voltage) and low power factor (such as: -0.8894), will appear due to The large generator capacity leads to the phenomenon that the rotor current rises much and the rotor winding has a high electrical density. This will lead to an increase in the overall loss of the generator. The temperature of the generator will increase, and the generator will continue to dissipate heat during operation. With the increase in temperature rise, the speed of the generator temperature will continue to increase and exceed the heat dissipation of the generator itself, which causes the problem of the generator to increase continuously. The temperature has a serious impact on the function of the generator itself, usually in order to cope with the harsh environment. The problem of temperature rise caused by increasing the size of the generator to increase the capacity of the generator is a conventional solution, but increasing the capacity of the generator will inevitably cause an increase in cost. Therefore, the rectangular slot 50 needs to be improved, but simply The deepening or widening of the rectangular slot 50 will narrow the tooth root of the rotor, resulting in super saturation of the rotor magnetic density and poor mechanical strength of the rotor teeth, which affects the performance and safety of the entire motor. This is due to simple deepening or widening The rectangular slot 50 will also change the shape of the upper and lower windings. In this embodiment, although the shape of the rotor slot 10 and the shaped winding 20 is changed, the overall cross-sectional area has not changed. The upper winding 21 and the lower winding 22 The aspect ratio has changed, but the surface area of the upper winding 21 and the lower winding 22 itself has not changed compared to the original, that is to say, the magnetic flux of the upper winding 21 and the lower winding 22 has not changed, and the performance of the generator has not changed. , Only changing the ratio of the upper winding 21 and the lower winding 22, in Figures 3 and 4, H1 is equal to H2, B1 is equal to B2, Bt2 is greater than or equal to Bt1, this can avoid the rotor magnetic density supersaturation, the mechanical strength of the tooth root becomes worse The problem.
进一步地,在本实施例中,如图5所示,上层绕组21和下层绕组22之间设有层间垫条30,半开口型转子槽型10中,第一空间111和第二空间112中分别能够容纳两个上层绕组21和两个下层绕组22,两个上层绕组21之间或者两个下层绕组22之间并不需要使用任何物体隔开,但是上层绕组21和下层绕组22之间需要使用层间垫条30,层间垫条30呈倒梯形,层间垫条30与上层绕组21接触一面的长度大于与下层绕组22接触的一面,层间垫条30将上层绕组21和下层绕组22之间的间隙填满,避免出现因间隙过大而导致绝缘漆流失,无法填满空间的现象。Further, in this embodiment, as shown in FIG. 5, an interlayer pad 30 is provided between the upper winding 21 and the lower winding 22, and in the semi-open rotor slot 10, the first space 111 and the second space 112 It can accommodate two upper windings 21 and two lower windings 22 respectively. There is no need to separate any objects between the two upper windings 21 or the two lower windings 22, but between the upper winding 21 and the lower winding 22 The interlayer pad 30 needs to be used. The interlayer pad 30 has an inverted trapezoid shape. The length of the side of the interlayer pad 30 contacting the upper winding 21 is longer than the side contacting the lower layer winding 22. The interlayer pad 30 connects the upper winding 21 and the lower layer. The gap between the windings 22 is filled to avoid the phenomenon that the insulating paint is lost due to the gap being too large and the space cannot be filled.
需要说明的是,在本实施例中,如图6和图7所示,转子槽型10为半开口型,半开口型转子槽型10所针对的是现有技术中的半开口型矩形槽50,在原有矩形槽50的基础上对槽体内部的空间进行改进,在不改变槽型内部整体空间大小的前提下,将矩形槽50改为T型槽,T型的转子槽型10中第一空间111相较于第二空间112来说,第一空间111的宽度加大但高度变低,上层绕组21比下层绕组22的宽度宽但高度低,不过整体上,上层绕组21和下层绕组22的表面积相同,这样就可以在不改变成型绕组20磁通量和容量的前提下,保证成型绕组20不会出现磁饱和的现象,图6中为现有技术的矩形槽50,图7为本实施例提供的转子槽型10,其中,C1等于C2,Bc1大于Bd1,Bc2小于Bd2。It should be noted that, in this embodiment, as shown in FIGS. 6 and 7, the rotor slot type 10 is a semi-open type, and the semi-open type rotor slot type 10 is directed to a semi-open type rectangular slot in the prior art 50. On the basis of the original rectangular slot 50, the internal space of the slot body is improved. Without changing the overall size of the internal slot, the rectangular slot 50 is changed to a T-shaped slot, and the T-shaped rotor slot 10 Compared with the second space 112, the first space 111 has a larger width but a lower height. The upper winding 21 is wider than the lower winding 22 but has a lower height. However, as a whole, the upper winding 21 and the lower space The surface area of the winding 22 is the same, so that without changing the magnetic flux and capacity of the formed winding 20, the phenomenon of magnetic saturation of the formed winding 20 is guaranteed. FIG. 6 is a rectangular slot 50 of the prior art, and FIG. 7 is based on The rotor slot 10 provided in the embodiment, wherein C1 is equal to C2, Bc1 is larger than Bd1, and Bc2 is smaller than Bd2.
实施例三Example Three
本实施例提供一种双馈风力发电机转子1,包括转子槽型10和成型绕组20,其中,转子槽型10中设有安装空间11,成型绕组20安装在安 装空间11内,转子槽型10开口的宽度等于安装空间11的宽度,这种转子槽型10为全开口型转子槽型10,即转子槽型10的槽口,也就是开口和安装空间11的大小一致。This embodiment provides a doubly-fed wind generator rotor 1, including a rotor slot 10 and a shaped winding 20, wherein the rotor slot 10 is provided with an installation space 11, the shaped winding 20 is installed in the installation space 11, the rotor slot The width of the opening 10 is equal to the width of the installation space 11. This rotor slot 10 is a full-open rotor slot 10, that is, the slot of the rotor slot 10, that is, the size of the opening and the installation space 11 are the same.
进一步地,在本实施例中,安装空间11中第一空间111的宽度等于上层绕组21的宽度,第二空间112的宽度等于下层绕组22的宽度,全开口型转子槽型10中安装空间11内的第一空间111中只能容纳一个上层绕组21,第二空间112中只能容纳一个下层绕组22,上层绕组21的宽度大于下层绕组22的宽度,上层绕组21的高度低于下层绕组22的高度。Further, in this embodiment, the width of the first space 111 in the installation space 11 is equal to the width of the upper winding 21, the width of the second space 112 is equal to the width of the lower winding 22, and the installation space 11 in the fully open rotor slot type 10 Only one upper winding 21 can be accommodated in the first space 111 in the interior, and only one lower winding 22 can be accommodated in the second space 112. The width of the upper winding 21 is greater than the width of the lower winding 22, and the height of the upper winding 21 is lower than that of the lower winding 22 the height of.
进一步地,在本实施例中,上层绕组21和下层绕组22之间设有塞块40,塞块40将上层绕组21和下层绕组22分联结在一起,使上层绕组21和下层绕组22之间产生接触。Further, in this embodiment, a plug block 40 is provided between the upper winding 21 and the lower winding 22, and the plug 40 connects the upper winding 21 and the lower winding 22 together, so that the upper winding 21 and the lower winding 22 Make contact.
进一步地,在本实施例中,如图8所示,塞块40位于上层绕组21和下层绕组22之间,塞块40上开设有第一凹槽和第二凹槽,上层绕组21的底端插设在第一凹槽中,下层绕组22的顶端插设在第二凹槽中。Further, in this embodiment, as shown in FIG. 8, the plug block 40 is located between the upper winding 21 and the lower winding 22, the plug block 40 is provided with a first groove and a second groove, and the bottom of the upper winding 21 The end is inserted into the first groove, and the top end of the lower winding 22 is inserted into the second groove.
需要说明的是,在本实施例中,转子槽型10为全开口型,全开口型转子槽型10是在现有技术中的开口型矩形槽50的基础上改进而成,与现有技术中的矩形槽50相比,转子槽型10的整体的容纳空间大小没有变化,上层绕组21和下层绕组22的表面积和容量不变,但是宽高比发生了变化,同时,塞块40方面,如图9所示,现有技术中采用的是标准的工型塞垫块60,而本实施例中,由于上层绕组21和下层绕组22的宽度不同,因此,工字型塞块40实际上是第一凹槽宽度大于第二凹槽宽度的非标准工字型,本实施例中提供的成型绕组20与现有技术相比,具体来讲T型槽与现有的矩形槽50相比,成型绕组20的导线截面增大到了1.235倍,转子的电密下降为现有矩形槽50的0.81倍,相应的转子铜耗在最恶劣工况下下降为现有矩形槽50的0.85倍。It should be noted that, in this embodiment, the rotor slot type 10 is a fully open type, and the fully open type rotor slot type 10 is improved on the basis of the open rectangular slot 50 in the prior art, which is different from the prior art Compared with the rectangular slot 50 in the middle, the overall accommodation space size of the rotor slot 10 has not changed, the surface area and capacity of the upper winding 21 and the lower winding 22 have not changed, but the aspect ratio has changed, and at the same time, the plug 40 As shown in FIG. 9, the standard I-shaped plug pad 60 is used in the prior art. In this embodiment, since the widths of the upper winding 21 and the lower winding 22 are different, the I-shaped plug 40 is actually It is a non-standard I-shape with a width of the first groove larger than that of the second groove. Compared with the prior art, the formed winding 20 provided in this embodiment is specifically compared with the existing rectangular groove 50 The wire cross section of the shaped winding 20 is increased to 1.235 times, the electrical density of the rotor is reduced to 0.81 times of the existing rectangular slot 50, and the corresponding rotor copper consumption is reduced to 0.85 times of the existing rectangular slot 50 under the worst conditions.
在本发明的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的 装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or The positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention.
在本发明中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接或可以互相通讯;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本发明中的具体含义。In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , Or integrated; can be mechanical connection, electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
在本发明的描述中,需要理解的是,本文中使用的术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,例如,包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process that includes a series of steps or units, A method, system, product, or device need not be limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or equipment.
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions of the technical solutions of the embodiments of the present invention. range.

Claims (10)

  1. 一种双馈风力发电机转子,其特征在于,包括:A doubly-fed wind turbine rotor, characterized by comprising:
    转子槽型和成型绕组,所述转子槽型内设有用于安装成型绕组的安装空间,且所述安装空间的纵向截面呈T型,所述转子槽型上开设可供所述成型绕组进入所述安装空间的开口。A rotor slot type and a shaped winding, wherein the rotor slot type is provided with an installation space for installing the shaped winding, and the longitudinal cross section of the installation space is T-shaped, and the rotor slot type is provided for the shaped winding to enter the Describe the opening of the installation space.
  2. 根据权利要求1所述的发电机转子,其特征在于,所述安装空间包括:相连通的第一空间和第二空间,且所述第一空间靠近所述开口;The generator rotor according to claim 1, wherein the installation space includes: a first space and a second space communicating with each other, and the first space is close to the opening;
    所述成型绕组包括:上层绕组和下层绕组,所述上层绕组位于所述第一空间内,所述下层绕组位于所述第二空间内。The shaped winding includes an upper layer winding and a lower layer winding, the upper layer winding is located in the first space, and the lower layer winding is located in the second space.
  3. 根据权利要求2所述的发电机转子,其特征在于,所述开口的宽度大于等于所述安装空间宽度的1/2且小于所述安装空间的宽度。The generator rotor according to claim 2, wherein the width of the opening is greater than or equal to 1/2 of the width of the installation space and less than the width of the installation space.
  4. 根据权利要求3所述的发电机转子,其特征在于,所述第一空间的宽度大于所述第二空间的宽度,且所述第一空间的宽度为所述上层绕组宽度的2倍,所述第二空间的宽度为所述下层绕组宽度的2倍。The generator rotor according to claim 3, wherein the width of the first space is greater than the width of the second space, and the width of the first space is twice the width of the upper winding. The width of the second space is twice the width of the lower winding.
  5. 根据权利要求3所述的发电机转子,其特征在于,所述上层绕组的高度小于所述下层绕组的高度,所述上层绕组的宽度大于所述下层绕组的宽度,且所述上层绕组和所述下层绕组的截面面积相等。The generator rotor according to claim 3, wherein the height of the upper winding is smaller than the height of the lower winding, the width of the upper winding is greater than the width of the lower winding, and the upper winding and the The cross-sectional areas of the lower windings are equal.
  6. 根据权利要求5所述的发电机转子,其特征在于,所述上层绕组和所述下层绕组之间设有层间垫条,所述层间垫条呈倒梯形。The generator rotor according to claim 5, characterized in that interlayer pads are provided between the upper winding and the lower winding, and the interlayer pads have an inverted trapezoid shape.
  7. 根据权利要求2所述的发电机转子,其特征在于,所述开口的宽度等于所述安装空间的宽度。The generator rotor according to claim 2, wherein the width of the opening is equal to the width of the installation space.
  8. 根据权利要求7所述的发电机转子,其特征在于,所述第一空间的宽度等于所述上层绕组的宽度,所述第二空间的宽度等于所述下层绕组的宽度。The generator rotor according to claim 7, wherein the width of the first space is equal to the width of the upper winding and the width of the second space is equal to the width of the lower winding.
  9. 根据权利要求8所述的发电机转子,其特征在于,还包括:塞块,所述塞块用于将所述上层绕组和所述下层绕组联结。The generator rotor according to claim 8, further comprising: a plug block, the plug block is used to connect the upper layer winding and the lower layer winding.
  10. 根据权利要求9所述的发电机转子,其特征在于,所述塞块上开设第一凹槽和第二凹槽,其中,所述上层绕组的底端插设在所述第一凹槽中,所述下层绕组的顶端插设在所述第二凹槽中。The generator rotor according to claim 9, wherein the plug block is provided with a first groove and a second groove, wherein the bottom end of the upper winding is inserted in the first groove , The top end of the lower layer winding is inserted in the second groove.
PCT/CN2019/119647 2018-12-05 2019-11-20 Rotor for doubly-fed wind generator WO2020114254A1 (en)

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CN112383157A (en) * 2020-10-29 2021-02-19 青岛中加特电气股份有限公司 Stator punching sheet, stator and motor
CN112994283B (en) * 2021-01-05 2023-03-24 上海电气风电集团股份有限公司 Stator reaches motor including it

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CN207353930U (en) * 2017-10-19 2018-05-11 台州鑫源电机制造有限公司 A kind of novel motor rotor punching

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