Stator of rotating electric machine excited by permanent magnets

FIELD: electricity.

SUBSTANCE: stator has a variety of segments located close to each other in the circumferential direction. According to the invention the above segments have teeth and slots passing in the longitudinal direction of the stator, at that the neighbouring segments touch each other at the segment boundary and teeth of the neighbouring segments are located so that at the segment boundary a tooth of one segment touches the tooth of the neighbouring segment, herewith the total width of the teeth touching each other at the respective boundary is bigger than the total width of the majority of teeth which are not placed at the segment boundaries or all teeth which are not placed at the segment boundaries directly, at that the minority of teeth not placed directly at the boundary of the specified segments has the same width, which is bigger than the total width of the majority of teeth which are not located directly at the segment border.

EFFECT: potential reducing of clamping moment or pendulous breaking in the rotating electric machine excited by permanent magnets.

5 cl, 3 dwg

 

The invention relates to a stator excited by a permanent magnet rotating electric machine.

In excited by a permanent magnet rotating electric machine such as, for example, excited by a permanent magnet generator, or excited by a permanent magnet motor, constructive critical value are fixing moments when stopping the electric machine. The amplitude of the fixing points should be minimal. In addition, it is necessary to keep possibly less pendulum moments that occur under load.

In particular, directly driven, excited by permanent magnet wind power generators fixing moments that occur when you stop and pendulum moments that occur during operation of wind power generators, it is necessary to keep possibly less.

To minimize the pendulum points currently in use are essentially the following ways:

mowing located in the electric machine rotor permanent magnets

mowing electrical wires in the stator of the electric machine,

the displacement of the permanent magnets of the rotor from the middle of the poles.

However, the above known methods are technologically text by the author.

From US 1779950 and CN 201298796 Y known electric machine with a stator consisting of a arranged in the circumferential direction of the stator segments, and the segments of the stator have the teeth and grooves and abut the corresponding teeth of the boundaries of the adjacent stator segments.

From US 4700098 And known electric machine with a stator, which has the teeth of the stator and located between the teeth of the stator grooves. To prevent the fixing grooves, the teeth of the stator and thereby the magnetic poles are not located at the same distance from each other.

Object of the invention is the reduction occurring in the excited permanent magnet rotating electric machine, a clamping and/or pendulum moments.

This problem is solved by using a stator excited by a permanent magnet rotating electric machine, the stator has lots located next to each other in the circumferential direction of the stator segments, and the segments are held in the longitudinal direction of the stator teeth and grooves, while bordering directly with each other, the segments are in contact at the boundary of segments, the teeth adjacent to each other of the segments are arranged so that the boundary portions of the teeth of one segment is in contact with the tooth adjacent to segmentsegment, the sum of the widths of both touching on the corresponding boundary segments more uniform width of the majority of teeth that are not located directly on the border segments, or all teeth that are not located directly on the border segments, while a minority of teeth that are not located directly on the border of the segments have a uniform width that is greater than the uniform width of the majority of teeth that are not located directly on the border of the segments.

Preferred embodiments of the invention follow from the dependent claims.

Due to the fact that the minority of teeth that are not located directly on the border of the segments have a uniform width that is greater than the uniform width of the majority of teeth that are not located directly on the border of the segments can be further reduced retention and/or pendulum moments.

In addition, preferably, when a minority of teeth that are not located directly on the border of the segments have a uniform width that is greater than the uniform width of the majority of teeth that are not located directly on the border of the segments. Due to this can be further reduced retention and/or pendulum moments.

In addition, preferably, when minorities the teeth, which are not located directly on the border of the segments have a uniform width which is less than or equal to twice the uniform width of the majority of teeth that are not located directly on the border of the segments. When the width of a minority of teeth that are not located directly on the border of the segments has a uniform width, which lies in the specified range, it is particularly strongly decrease the locking and/or pendulum moments.

In addition, preferably, when the widths of both touching on the corresponding boundary segments of teeth are the same, because in this case the segments on the boundary segments performed mechanically particularly stable.

When excited by a permanent magnet rotating electric machine can be performed, for example, in the form of a generator or motor, and the generator can be performed, in particular, in the form of wind power generator and, in particular, in the form of a directly driven (turbine connected directly without intermediate included transfer from the wind power generator wind power generator.

Below is a more detailed explanation of the exemplary embodiment of the invention with reference to the accompanying drawings, which schematically:

figure 1 - induced permanent MAG what it rotating electric machine, according to the invention, and

figure 2 - part of the stator according to the invention, the machine, according to one variant of execution of the invention;

figure 3 - part of the stator according to the invention, the machine, according to another variant implementation of the invention.

1 schematically shows in isometric projection excited by a permanent magnet rotating electric machine 1 according to the invention. The machine 1 is performed in the framework of the exemplary embodiment in the form of the generator and, in particular, in the form of wind power generator. It should be noted that for clarity, figure 1 shows only significant for the understanding of the invention, the components of the machine 1.

Machine 1 has a rotor 2, which is mounted for rotation around a rotational axis R of the machine 1. When the rotor 2 contains all located on the rotating elements of the machine 1. The rotor 2 has a rotor yoke 3, which are permanent magnets, for clarity, in figure 1, only one permanent magnet is indicated by position 4. When working machine 1, the rotor 2 rotates in the framework of the example running around located in the car 1 Central and stationary relative to the environment of the machine 1 of the stator 5. Since the rotor 2 is located around the stator 5, this machine is also called machine with an outer rotor. Since the rotor 2 has permanent magnets, which is haunted constantly create a magnetic field for operation of the machine 1, this machine is also called excited by a permanent magnet electric machine. Because the machine 1 has a rotating rotor 2, this machine is also called rotary electrical machine.

The stator 5, according to the invention, has lots located next to each other in the circumferential direction U of the stator 5 segments. In this regard, examples of the implementation of the stator 5 has six segments, for clarity, only the segments 8A and 8b are marked position. The segments are held in the axial direction Z of the stator 5, the teeth and grooves, for clarity, in figure 1 only the teeth 7a, 12A, 7b, 12b and the groove 6 is marked positions. Directly adjacent segments abut on the border segments, for clarity, only the border of 9 segments which adjoin the segments 8A and 8b, the indicated position. Each segment consists of arranged one after another in the axial direction Z of the metal sheets. When this individual metal sheets one segment, usually equipped with an electrically insulating layer, such as, for example, a layer of varnish. When mounting the stator 5 segments have next to each other in the circumferential direction U and connect with each other, so it shows a tubular stator 5.

The teeth and grooves of the segments occur due to meet the total run-shaped metal sheets. In the groove around the teeth are electric stator winding, with the winding for clarity, and because they are not essential for the understanding of the invention, not illustrated.

In the proposed trade excited by a permanent magnet rotating electrical machines the width of the individual teeth of the stator 5 are the same. According to the invention, due to deliberate narrowing of certain teeth compared to the other teeth of the stator 5, the decrease occurring during operation of the machine and locking the pendulum moments.

It should again be noted that figure 1 is a schematic depiction, in which, for example, in particular the width, the number and size of teeth, grooves, and permanent magnets, as well as the value located between the stator and rotor air gap does not correspond to reality.

Figure 2 schematically shows a section of the part of the segment 8A, adjacent to the segment of the segment 8A 8b. Both of segment 8A and 8b are in contact at the border of the 9 segments. In the shown part of the segment 8A has teeth 12A, 7a, 7a', 7a ' and 7a"'and the segment 8b has teeth 12b, 7b, 7b', 7b" and 7b"'. It should be noted that in reality, the segment may be, for example, hundreds of teeth and grooves, so that figure 2 shows only a small part of the segments.

According to izaberete the Oia, teeth adjacent to each other of the segments are arranged so that the corresponding boundary segments, the teeth of one segment is in contact with the tooth adjacent to the segment of the segment. In the framework of the exemplary embodiment, for example, the teeth adjacent to each other of the segments 8A and 8b are arranged so that the boundary 9 segments prong segment 8A is in contact with the tooth adjacent to the tooth segment 8A 8b. In the framework of the exemplary embodiment is the prongs 12A and 12b, adjacent to the border of the 9 segments. Thus, according to the invention, there is no separation of the stator inside the grooves.

In figure 2 for clarity, only one groove 6 designated position. The segment ends, as mentioned above, in the circumferential direction U is not in the groove, i.e. the boundary 9 of the segments does not lie within the grooves. Prong 12A has a width a, and the tooth 12b - width b. Teeth that are not located directly on the border segments, i.e. in the shown in figure 2, the exemplary embodiment shown, the teeth 7a, 7a', 7a", 7a"', 7b, 7b', 7b", 7b"' have the same width, i.e. they all have the same width. According to the invention, the sum (a+b) widths a and b are in contact on the corresponding boundary segments of teeth 12A and 12b more uniform width with all the prongs 7a, 7a', 7a", 7a"', 7b, 7b', 7b", which is not located is received directly on the border of the 9 segments.

That is,

a+b>c

Thus, formed from both touching on the border of the 9 segments of teeth 12A and 12b total tooth 11 has a larger width, in particular a much greater width than the uniform width with teeth that are not located directly on the border of the 9 segments. Due to this, according to the invention, significantly reduced the retainer and the pendulum moments. Thus, in contrast to the prior art is not any tooth is divided by a boundary segments, so that the two resulting partial teeth are not as in the prior art, if we neglect may arise, located between the two partial teeth air gap of the same width as the undivided prong.

The high mechanical stability of the segments is achieved when the widths a and b both touching on the corresponding boundary segments of teeth are the same, i.e. a=b.

In the framework of unified manufacturing preferably, when all the teeth of the segment and thereby the stator have the same width, ie,

a=b=C

Due to this, additionally achieved a particularly high mechanical stability of the stator and the individual segments as at the boundary of segments no of teeth that have only part of the width of the teeth, which are on the border of the segments.

Figure 3 shows another variant issue the log of the invention, thus in figure 3 the same elements are denoted by the same positions as in figure 2. The principle of operation and design options for performing, according to figure 3, the same option of the run, according to figure 2, however, in an embodiment according to figure 3, a minority of teeth that are not located directly on the border of the segments are wider than the uniform width of the majority of teeth that are not located directly on the border of the segments. In this regard, examples of the implementation of the teeth 13A and 13b have a width d, which is more uniform width with the majority of teeth 7a, 7a', 7a", 7b, 7b', 7b", which are not located directly on the border of the segments. That is,

d>c

The sum (a+b) widths a and b both touching on the borders of the 9 segments of teeth, more uniform width with the majority of teeth 7a, 7a', 7a", 7b, 7b', 7b", which are not located directly on the border of the segments.

Particularly good suppression of the locking and rocking moments is achieved when a minority of teeth 13A, 13b, which are not located directly on the border of the segments have the same width d which is less than or equal to twice the uniform width of the majority of teeth that are not located directly on the border segments, ie,

c<d≤2c

Naturally, also in this embodiment, is subramania preferably, when the widths of both touching on the corresponding boundary segments of teeth equal, ie,

a=b

To achieve a particularly high stability to the width of the teeth preferably, when

a=b=c

i.e. the width of the teeth, which are located directly on the border segments coincides with the width of the majority of teeth that are not located directly on the border of the segments.

Above under the description of figure 2 and figure 3 relative to both segments 8A and 8b rightly so, for the rest not shown in figure 2 and figure 3 segments of the stator 5.

Due to the invention it is possible to refuse technologically sophisticated measures, such as the shift in the poles or mowing.

Made so the segments on the basis of higher stiffness and on the base located on the border segments of the tooth is more simple in manufacture and Assembly than in conventional stators, in which all the teeth, including formed from both touching on the corresponding boundary segments of teeth, shared prong, have a uniform width (a+b=c=d).

1. The stator is excited by a permanent magnet rotating electric machine (1)with a stator (5) has lots located next to each other in the circumferential direction (U) of the stator (5) segments (8A, 8b), while the segments (8A, 8b) are held in the longitudinal direction (Z stator (5) teeth (7a, 7a', 7a, 7a', 7b, 7b', 7b", 7b"', 13A, 13b, 12A, 12b) and grooves (6), bordering directly with each other segments (8A, 8b) are in contact at the border (9) segments, with teeth (7a, 7a', 7a, 7a', 7b, 7b', 7b", 7b"', 13A, 13b, 12A, 12b) directly-adjacent segments (8A, 8b) are arranged so that the bound (9) segments prong (12A) of one segment (8A) is in contact with the tooth (12b) adjacent to the segment (8A) segment (8b), the sum of the widths (a, b) both touching on the appropriate border (9) segments of teeth (12A, 12b) is greater than the uniform width (C) of the majority of teeth (7a, 7a', 7a", 7b, 7b', 7b"), which are not located directly on the border (9) segments, or all teeth (7a, 7a', 7a, 7a', 7b, 7b', 7b", 7b"'), which are not located directly on the border (9) segments, while a minority of teeth (13A, 13b), which are not located directly on the border (9) segments have the same width (d), which is more uniform width (C) of the majority of teeth (7a, 7a', 7a", 7b, 7b', 7b"), which are not located directly on the border (9) segments.

2. The stator according to claim 1, characterized in that a minority of teeth (13A, 13b), which are not located directly on the border (9) segments have the same width (d)which is less than or equal to twice the single width (C) of the majority of teeth (7a, 7a is, 7a, 7b, 7b', 7b"), which are not located directly on the border (9) segments.

3. The stator according to any one of claims 1 or 2, characterized in that the width (a, b) both touching on the corresponding edge (9) of teeth (12A, 12b) are equal.

4. Excited by a permanent magnet rotating electric machine (1), machine (1) is made in the form of a generator or motor and has a stator (5) according to any one of claims 1 to 3.

5. Excited by a permanent magnet rotating electric machine (1) according to claim 4, characterized in that the generator is made in the form of wind power generator.



 

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2 dwg

FIELD: electricity.

SUBSTANCE: permanent magnet machine contains a fixed stator and a movable rotor made of non-magnet material, in the stator frame there are U-shaped imbricated cores with windings, the rotor contains operating components made as the permanent magnets placed in the openings in the form of slots with size l and l1, at that the number of slots m is equal to the number of the permanent magnets. At that the stator frame of the permanent magnet machine is made as a hollow cylinder with at least 3 groups of U-shaped imbricated cores with windings placed at its inner surface. Each group contains at least 3 U-shaped imbricated cores with windings interconnected in series and shifted in regard to each other per the distance L. The rotor is placed inside the stator and consists of a hollow cylinder with the permanent magnets placed in its slots and shifted in regard to each other per the angle of α=120°, poles of the permanent magnets protrude the limits of the hollow cylinder per a value Δ: Δ=d-l', where Δ is a value of the magnet poles protrusion outside the limits of the hollow cylinder; d is a circle diameter defined by the inner diameter of the stator and sizes of the magnet core; l' is a value of the air gap between the magnet core and the magnet.

EFFECT: improving efficiency of the permanent magnet machine with simultaneous reducing of pulling force in the axial direction and simplifying of the design, providing maximum power factor at the disc-type design of the machine.

3 dwg

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