WO2020114254A1

WO2020114254A1 - Rotor for doubly-fed wind generator

Info

Publication number: WO2020114254A1
Application number: PCT/CN2019/119647
Authority: WO
Inventors: 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
Priority date: 2018-12-05
Filing date: 2019-11-20
Publication date: 2020-06-11
Also published as: CN111277060A; CN111277060B

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

Rotor of doubly-fed wind generator

Technical field

The invention relates to the field of wound rotor motors, in particular to a double-fed wind generator rotor.

Background technique

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.

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.

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.

Summary of the invention

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.

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.

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.

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.

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.

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.

Further, the width of the opening is equal to the width of the installation space.

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.

Further, it further includes a plug block, which is used to connect the upper layer winding and the lower layer winding.

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.

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.

BRIEF DESCRIPTION

1 is a schematic diagram of a rotor slot structure of a wind turbine rotor in the prior art;

2 is another schematic structural diagram of a rotor slot type of a wind turbine rotor in the prior art;

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;

4 is a schematic diagram of a rectangular slot structure of a wind turbine rotor in the prior art;

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;

6 is a schematic structural diagram of a semi-open rotor slot type of a wind turbine rotor in the prior art;

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;

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;

9 is a schematic diagram of a plug block structure of a wind turbine rotor in the prior art.

Description of reference signs:

1- Double-fed wind turbine rotor;

10-Rotor geometry;

11-Installation space;

111- the first space;

112-second space;

20-shaped winding;

21- upper winding;

22- Lower layer winding;

30-interlayer pads;

40-plug block;

50-rectangular slot;

60-type plug pad.

detailed description

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.

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.

Example one

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.

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.

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.

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.

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.

Example 2

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.

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.

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.

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.

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.

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.

Example Three

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.

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.

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.

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.

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.

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.

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.

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.

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

A doubly-fed wind turbine rotor, characterized by comprising:

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.
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;

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.
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.
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.
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.
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.
The generator rotor according to claim 2, wherein the width of the opening is equal to the width of the installation space.
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.
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.
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.