KR101369303B1 - A multi-layer inserting type fulx-reversal machine - Google Patents

Abstract

The magnetic flux reversing device according to the present invention comprises: a stator including a yoke on which a coil is wound, a plurality of stators protruding radially at equal intervals inside the yoke, and stator tissues respectively formed at ends of the plurality of stator teeth; Permanent magnets embedded in each stator tissue; And a rotor rotatably installed in the inner space of the stator, the rotor having a plurality of rotor teeth facing the plurality of stator teeth, wherein the coils each of the yokes corresponding to the plurality of stator teeth. It is characterized in that the winding.

Description

Multi-layer embedded magnetic flux reversing device {A MULTI-LAYER INSERTING TYPE FULX-REVERSAL MACHINE}

The present invention relates to a stator structure of a magnetic flux reversing device used in an electric motor or a generator.

In general, Flux-Reversal Machine (FRM) is a type of permanent magnet installed in the stator of the switched reluctance motor to compensate for the disadvantages of the switched reluctance motor and to take advantage of the permanent magnet type device. Has a structure. Such magnetic flux reversing devices are used in electric motors and generators.

In the structure of the conventional magnetic flux reversing device, the rotor is rotatably inserted into the space part inside the stator. The stator teeth protrude from the inner surface of the stator at a predetermined angle, and permanent magnets are installed at the ends of the stator teeth, and coils are wound around each stator tooth to form a fixed magnetic pole for each stator tooth.

The rotor has a rotation axis in the center, and a plurality of rotor teeth protrude from the rotor at an angular interval. The plurality of rotor teeth corresponds to the ends of the plurality of stator teeth and rotates by forming voids in a non-contact state.

As such, the magnetic flux reversing device formed of the stator and the rotor changes the direction of the current flowing through the coil wound on the stator teeth, and generates rotational torque by the repulsive force or the suction force between the stator teeth and the rotor teeth to generate electrical energy. Switch to energy.

Such a general magnetic flux reversing device has a problem in that noise and vibration are greatly generated due to the cogging torque generated by the suction and repulsion of the permanent magnet and the rotor on the stator side, and also on the surface of the stator teeth. Due to the structure in which the permanent magnet is installed, the effective magnetic flux which generates torque due to the leakage of the magnetic circuit is large, and thus improvement is required.

In order to solve this problem, the present applicant was able to reduce noise and vibration by reducing the cogging torque generated in the above-described general magnetic flux reversing apparatus by purchasing a permanent magnet into the stator tissue as disclosed in Korean Patent No. 10-1015468. At the same time, leakage of magnetic circuits can be minimized.

However, such a permanent magnet embedded magnetic flux reversing device is used to determine the overall size of the permanent magnet (size according to the increase in thickness) according to the constraint of the space area secured between the yoke of the stator and the stator tooth in order to wind the stator teeth. Structural problems that could not be further increased have limited the ability to increase torque and output of the magnetic flux reversing device.

Accordingly, in order to increase the torque and output of the magnetic flux reversing device, the total length of the magnetic flux reversing device should be increased or the outer diameter should be increased. In this case, the volume of the magnetic flux reversing device has been increased.

The present invention has been made in view of the above problems, and increases the use of the multi-layer permanent magnet embedded in the stator tissue by increasing the thickness of the stator tissue, the winding is applied to the stator yoke to increase the effective magnetic flux torque The object of the present invention is to provide a magnetic flux reversing device that can improve the constant and power density.

Another object of the present invention is to provide a magnetic flux reversing device that can effectively increase torque and output by having two rotors disposed inside and outside a single stator.

In order to achieve the above object, the present invention includes a yoke, the coil is wound, a plurality of stators protruding radially equally spaced inside the yoke, and a stator tissue formed at each end of the plurality of stator teeth Stator; Permanent magnets embedded in each stator tissue; And a rotor rotatably installed in the inner space of the stator, the rotor having a plurality of rotor teeth facing the plurality of stator teeth, wherein the coils each of the yokes corresponding to the plurality of stator teeth. It provides a magnetic flux reversing device, characterized in that wound on.

It may further include an additional coil wound around the plurality of stator teeth.

Of course, it is also possible to have a plurality of permanent magnets installed so as to have different polarities on both sides with respect to the center of the stator tissue.

The permanent magnet is preferably embedded to occupy a thickness of 90% to 95% of the stator tissue thickness.

In addition, the present invention, to achieve the above object, the yoke coil is wound, a plurality of inner stator and radially equally spaced protruding inside the yoke, stator tissue and each formed at the end of each inner stator and A stator including a plurality of outer stators protruding radially at equal intervals from the outside of the yoke, and stator tissues formed at ends of each outer stator; Permanent magnets embedded in the inner stator tissues and the outer stator tissues, respectively; And an inner rotor rotatably installed in the inner space of the stator, the inner rotor having a plurality of rotor teeth facing the plurality of inner stator teeth; And an outer rotor rotatably installed surrounding the outside of the stator, the outer rotor having a plurality of rotor teeth facing the plurality of outer stator teeth.

Some of the plurality of outer stator teeth may be set at positions corresponding to the plurality of inner stator teeth, and others may be positioned between the outer stator teeth set at positions corresponding to the plurality of inner stator teeth.

Preferably, the coil is wound around each part of the yoke corresponding to the plurality of outer stator teeth.

The apparatus may further include additional coils wound around the plurality of inner stator teeth and the plurality of outer stator teeth.

As described above, in the present invention, the torque constant and the output density due to the increase in the effective magnetic flux are increased by increasing the amount of permanent magnets used and the amount of coil windings.

In addition, according to the present invention, as the rotors are disposed inside and outside the stator, torque and output can be effectively increased as compared to having a single rotor.

1 is a schematic diagram showing a magnetic flux reversing device according to a first embodiment of the present invention,
FIG. 2 is a perspective view illustrating the structure of the stator tooth and the stator tissue shown in FIG. 1;
3 is a graph comparing a counter electromotive force (torque constant) between a conventional magnetic flux reversing device and a magnetic flux reversing device according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing a magnetic flux reversing device according to a second embodiment of the present invention,
5 is a schematic diagram showing a magnetic flux reversing device according to a third embodiment of the present invention.

Hereinafter, a magnetic flux reversing device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Referring to FIG. 1, the magnetic flux reversing device according to the first embodiment of the present invention includes a stator 10 and a rotor 20 rotatably disposed inside the stator 10.

The stator 10 is constructed by laminating thin iron plates. The stator 10 has a substantially circular yoke 11, and includes a plurality of stator teeth 13 extending into the yoke 11.

In the yoke 11, coils 12 are wound around portions corresponding to the respective stator teeth 13. As such, as the coil 12 is wound around each part of the yoke 11, a larger amount of coil may be wound than in the related art.

The plurality of stator teeth 13 are arranged radially at equal intervals, and FIG. 1 shows a structure in which six stator teeth 13 are formed in the yoke 11 by way of example. At each end of the stator tooth 13, a stator tooth 15 having a width larger than the thickness of the stator tooth 13 is extended. That is, the stator tissue 15 is formed in a "⊥" shape formed on both sides around the stator tooth 13, the plurality of recessed grooves 17 is a stator tissue (schematic) so that a plurality of permanent magnets 30 can be embedded 15) is formed in the longitudinal direction.

In this case, since the coil wound around the stator tooth 13 can be omitted in the first embodiment of the present invention, the thickness t1 of the stator tooth 15 can be made thicker than that of the conventional magnetic flux reversing device. have. Accordingly, the depth of the recessed grooves 17 of each stator shoe 15 may be formed deeper than in the related art, and the thickness t2 of the permanent magnet 30 embedded therein may also be made thicker than in the related art, and thus the magnetic flux as a whole It is possible to increase the amount of the permanent magnet 30 used in the reverse type device.

On the other hand, the depth of each embedded groove 17 is preferably formed to correspond to the thickness (t2) of the permanent magnet (30) so that the embedded permanent magnet 30 does not protrude further than the tip of the stator tissue (15). Do. In addition, each of the recessed grooves 17 may form two recessed grooves 17 on the left and right sides based on the center of the stator tissue 15 so as to form four grooves for each stator tissue 15. The magnets 30 can be arranged in a multilayer structure.

The rotor 20 has a rotor shaft 21 installed at the center thereof and is inserted into a space provided inside the stator 10. On the outer side of the rotor 20, a plurality of rotor teeth 23 are projected radially. In FIG. 2, an example is shown in which the number of rotor teeth 25 is eight. On the other hand, like the stator 10, the rotor 20 is also preferably formed by laminating thin iron plates. Since the rotor 20 is a structure applied to a general magnetic flux reversing device, a detailed description thereof will be omitted.

The permanent magnet 30 preferably uses sintered rare earth (Nd-Fe-B), and permanent magnets 30 having different polarities are provided on both sides of the stator tissue 15. For example, when a pair of permanent magnets embedded in one side of the stator tissue 15 has N poles among the four permanent magnets 30 embedded in one stator tissue 15, the stator tissue 15 The other pair of permanent magnets embedded on the other side of the S pole.

The permanent magnet 30 is preferably formed to have a thickness t2 of approximately 90 to 95% of the thickness t1 of the stator tissue 1.

Hereinafter, the operation of the magnetic flux reversing device according to the first embodiment of the present invention will be described.

First, when current flows through the coil 12 wound on the yoke 11 of the stator 10, each stator tooth 13 is formed as a stator pole. Stator poles 13 are stator poles 13 which are formed such that stator poles in diagonal directions are electrically connected to each other to generate the same polarity.

On the other hand, since the magnetic flux by the permanent magnet 30 is circulated only in the stator 10 and the rotor 20, when the rotor 20 rotates in the counterclockwise direction of Figure 1, the magnetic flux gradually moves the stator yoke 11 Flowing through, the flux linkage in the winding increases in the reverse direction. Therefore, if one pole of the permanent magnet 30 fixed to the stator 10 and the rotor teeth 23 are completely matched, the linkage flux is maximized. In the present embodiment, since the same poles are arranged in pairs on both sides of the stator tissue 15, two peaks are formed at the point where the linkage flux is maximized (see the graph of FIG. 3).

In addition, if the rotor 20 continues to rotate in the counterclockwise direction in the above state, the amount of linkage flux is gradually reduced, so that the center of the non-protruding portion of the rotor 20 is the pole of the permanent magnet 30. Located between the poles, the linkage flux is zero.

If the rotor 20 continues to rotate in the counterclockwise direction, the polarity of the magnetic flux is changed. If one pole of the permanent magnet 30 and the rotor tooth 23 coincide, the linkage flux is maximized again. Even in this case, two peaks are formed at the point where the linkage flux is maximized (see the graph of FIG. 3).

As the rotation continues and the rotor 200 continues to rotate in the counterclockwise direction, the amount of linkage flux gradually decreases, so that the center of the non-protruding portion of the rotor 200 is connected to the pole of the permanent magnet 30. Located between the poles, the linkage flux is zero.

While repeating the above process, the rotor 20 may rotate inside the stator 10.

On the other hand, the reverse electromotive force constant and torque constant of the magnetic flux reversing device is the same as the brushless DC motor (brushless DC motor). Therefore, the torque capability of the magnetic flux reversing apparatus according to the present invention can be evaluated using the counter electromotive force waveform.

3 is a graph comparing the counter electromotive force with a conventional magnetic flux reverser using the magnetic flux reversing apparatus according to the present invention.

As shown, it can be seen that the magnetic flux reversing device according to the embodiment of the present invention has a higher peak value than the conventional magnetic flux reversing device under the same rotational speed condition, and thus has a larger magnitude of counter electromotive force than the conventional magnetic flux reversing device. You can check that you have it. This shows that the magnetic flux reversing device according to the embodiment of the present invention increases the amount of use and winding of the permanent magnet 30 as compared with the related art, thereby improving torque constant and output density due to the increase of the effective magnetic flux. .

4 schematically shows a magnetic flux reversing device according to a second embodiment of the present invention.

The magnetic flux reversing device shown in FIG. 4 has the same configuration as the magnetic flux reversing device of the first embodiment described above, except that a coil 19 is additionally wound around each of the plurality of stator teeth 13a formed on the yoke 11. There is a difference.

As described above, the magnetic flux reversing apparatus of the second embodiment may maximize the winding amount of the coil as the coil 12 is wound around the yoke 11 and the coil 19 is also wound on the stator tooth 13a.

In this case, it is necessary to secure a space between the stator teeth 15a and the yoke 11 so that the coil 19 can be wound around the stator teeth 13a. Accordingly, the thickness of the stator tissue 15a may be somewhat smaller than the thickness of the stator tissue 15 of the first embodiment. Accordingly, the amount of the permanent magnet 30a may be slightly reduced as compared with the first embodiment. Therefore, in the second embodiment, the thickness of the stator tissue 15a is appropriately set so that the torque constant and the output density of the magnetic flux reversing apparatus can be maintained at a level similar to that of the first embodiment in consideration of the usage amount of the permanent magnet 30a. It is desirable to.

Each of the first and second embodiments described above includes a single stator and a single rotor, and the magnetic flux reversing apparatus according to the third embodiment described below includes a single stator and an inner / outer rotor.

5 is a schematic diagram showing a magnetic flux reversing device according to a third embodiment of the present invention.

The magnetic flux reversing device according to the third embodiment is rotatably disposed while surrounding the outside of the stator 100, the inner rotor 210 rotatably disposed inside the stator 100, and the stator 100. An outer rotor 230.

The stator 100 has a substantially circular yoke 111 and a plurality of inner stator teeth 113 protruding at equal intervals into the yoke 111 (for example, the number of the inner stator teeth 113 is 6). And a plurality of outer stator teeth 123 (for example, the number of outer fixing teeth 123 is 12) protruding at equal intervals to the outside of the yoke 111.

In this case, coils 212 are wound around the yoke 111 at portions corresponding to the respective outer stator teeth 123.

The plurality of inner stator teeth 113 are arranged substantially radially, similarly to the fixed gear teeth 13 and 13a of the first and second embodiments, and at the ends of each stator tooth 113 than the thickness of the stator teeth 113. An inner stator tissue 115 having a larger width is formed to extend. In this case, the inner stator tissue 115 is provided with a plurality of recessed grooves so that the plurality of permanent magnets 310 may be embedded. Since the depths of the recesses and the magnetic poles of the permanent magnets 310 are the same as those of the first embodiment, detailed description thereof will be omitted.

The plurality of outer stator teeth 123 are arranged substantially radially, and an outer stator tooth 125 having a width larger than the thickness of the outer stator teeth 123 is formed at the end of each stator tooth 123. In this case, the outer stator tissue 125 is formed with a plurality of embedding grooves so that the plurality of permanent magnets 330 can be embedded. Since the depth of each of the recesses formed in the outer stator tooth 125 and the magnetic poles of the permanent magnets 330 are the same as those of the first embodiment, detailed description thereof will be omitted.

Meanwhile, six of the twelve outer stator teeth 123 are set at positions corresponding to six inner stator teeth 113, and the remaining six outer stator teeth 123 correspond to the inner stator teeth 113. Each of the six outer stator teeth 123 is positioned at equal intervals.

As in the first and second embodiments, the inner rotor 210 is provided with a rotor shaft 211 at the center thereof and inserted into a space provided inside the stator 100. On the outer side of the inner rotor 210, a plurality of rotor teeth 213 facing the inner stator tooth 115 of the stator 100 is radially projected. In FIG. 5, for example, the number of the rotor teeth 213 is illustrated.

The outer rotor 230 is disposed to surround the outside of the stator 100, and although not illustrated in the drawing, the outer rotor 230 is rotatably disposed by a predetermined housing that slidably supports the outside of the outer rotor 230.

The outer rotor 230 has a plurality of rotor teeth 233 facing the outer stator tissue 125 of the stator 100 on the inner side radially protruding arrangement. In FIG. 5, for example, the number of the rotor teeth 233 is illustrated.

As such, in the third embodiment, as the inner and outer rotors 210 and 230 are disposed on the inner and outer sides of the stator 100, torque and output can be increased more effectively than the magnetic flux reversing apparatus having a single rotor. Can be.

In addition, although the third embodiment is not shown in the drawings, like the first embodiment, the inner and outer stator teeth 113 and the coils 114 and 124 wound on the outer stator teeth 123 are omitted, and each inner and outer stator is omitted. The thickness of the tissues 115 and 125 may be made thicker. In addition, the thickness of the permanent magnets 310 and 330 embedded in the thickened inner and outer stator tissues 115 and 125 may be increased. Accordingly, in the case of the third embodiment as well as the first embodiment, the amount of permanent magnets can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10,100: stator 11, 111: yoke
12,114,124,212: coil 13,13a: stator tooth
15, 15a: stator tissue 17: recess
20: rotor 21,211: rotor shaft
23,213,233: Rotor teeth 30,310,330: Permanent magnet
113: inner stator tooth 115: inner stator tooth
123: outer stator teeth 125: outer stator teeth
210: inner rotor 230: outer rotor

Claims (9)

delete delete delete delete A yoke in which coils are wound, a plurality of inner stator teeth protruding radially at equal intervals inside the yoke, stator tissues formed at ends of each inner stator tooth, and radially equal intervals outside the yoke A stator including a plurality of outer stator teeth protruding from each other, and stator tissues formed at ends of the respective outer stator teeth;
Permanent magnets embedded in the inner stator tissues and the outer stator tissues, respectively;
An inner rotor rotatably installed in an inner space of the stator and having a plurality of rotor teeth facing the plurality of inner stator teeth; And
An outer rotor rotatably installed surrounding the outer side of the stator and having a plurality of rotor teeth facing the plurality of outer stator teeth;
A part of the plurality of outer stator teeth is set at a position corresponding to the plurality of inner stator teeth, and the other is positioned between each outer stator tooth set at a position corresponding to the plurality of inner stator teeth. Magnetic flux reversing device. delete 6. The method of claim 5,
And the coil is wound around each of the yokes corresponding to the plurality of outer stator teeth. The method according to claim 5 or 7,
And a further coil wound around the plurality of inner stator teeth and the plurality of outer stator teeth, respectively. 6. The method of claim 5,
The permanent magnet is characterized in that it is embedded to occupy a thickness of 90% to 95% of the thickness of the inner stator and the outer stator tissue.

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