JP2017055556A - Axial gap type rotary electric machine, and pump and compressor that use the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of performing output adjustment of an axial gap type rotary electrical machine without changing the dimension of a stator core and the dimension of a rotor structure yoke in the same housing frame.SOLUTION: An axial gap type rotary electric machine having one stator 300 in the axial direction and first and second two rotors 100, 200 on both the sides thereof is characterized in that a part of a permanent magnet 3 for field magnetization is replaced with a yoke portion 4 made of a soft magnetic material. Further, the permanent magnet 3 for field magnetization may be disposed in the first rotor 100, and the yoke portion 4 made of a soft magnetic material may be disposed in the second rotor 200. In addition, the permanent magnet 3 for the field is disposed in either or both of the first rotor 100 and the second rotor 200, and only one of N pole and S pole is disposed on the surface thereof. The yoke portion 4 made of a soft magnetic material may be disposed between the permanent magnet poles 3.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to an axial gap type rotating electrical machine such as an axial gap type motor.

  As a rotating electrical machine used as a power source for industrial machines, an axial gap rotating electrical machine is used for various applications because it has features such as a thinner motor portion, higher inertia, and higher efficiency. The axial gap type rotating electrical machine has a structure having a disk-shaped rotor having a relatively large diameter as compared to a general radial type rotating electrical machine. For this reason, when the motor is to be configured within a predetermined diameter, the diameter of the disk can be increased, so that a larger torque can be obtained compared to the radial type motor. When a larger torque is expected, an axial gap type rotating electrical machine having a structure having two rotors in the axial direction can be configured for one stator. In this method, since many permanent magnets as field sources can be arranged on the disk, it is possible to increase the amount of magnetic flux that contributes to torque generation.

  Patent Document 1 proposes a method for increasing the efficiency of an axial gap motor having one stator and two rotors. By using an iron core made of low-loss amorphous metal foil strip for the stator core and using a low-loss material such as eddy current loss for the rotor magnet, the generated loss can be suppressed. It has been proposed as a structure that can increase the efficiency of the system.

  On the other hand, an axial gap type motor having two stators for one rotor has been studied. This is a structure in which a rotor having a permanent magnet is provided in the center in the axial direction, and stators are arranged on both sides thereof. Since this structure can increase the gap facing area between the stator and the rotor, similarly to the above-described axial gap type rotating electric machine having two rotors, high torque can be expected. However, there is a concern that the structure of the entire system may be complicated by having two complicated stator parts composed of wound coils or insulators. As a method for simplifying the system, there is an axial gap type motor having one stator and one rotor. This motor structure has a structure in which the magnetic attraction force generated in the gap always continues to work in one direction, and continues to apply a large thrust force to the bearing, so it has not been applied to industrial machines from the viewpoint of service life. . Patent Document 2 proposes a structure that reduces the attractive force acting on the gap portion. As an axial gap motor having two stators, a structure has been proposed in which one side of the stator is simplified as a yoke part. Thereby, the suction force of the gap portion can be balanced.

Japanese Patent No. 5635921 JP 2008-199811 A

  The axial gap type rotating electrical machine shown in Patent Document 1 is characterized in that the torque output is increased by a large-diameter disk-shaped rotor magnet, while the output adjustment cost is less than that of a radial rotating electrical machine. Are known. In the case of a general radial type rotating electric machine, the torque output can be adjusted by changing the length in the axial direction. Therefore, a stator core or a rotor core having the same cross section is composed of a thin steel plate having a thickness of 0.3 to 0.5 mm called an electromagnetic steel plate or a silicon steel plate, and the stator core or A rotor core can be formed. As a result, when torque is required, the rotor and stator of the same cross section can be configured to extend as much as possible in the axial length direction, so there are several types with a single mold (core shape, housing dimensions). A motor with a different output can be configured.

  On the other hand, in the axial gap type rotating electric machine, even if the stator core is extended in the axial length, it is difficult to adjust the output because the amount of the magnet field cannot be increased. In the axial gap type rotating electrical machine, the element corresponding to the core thickness (axial length) of the radial gap type rotating electrical machine is a radial dimension. When the dimension in the radial direction is changed, the gap facing area between the magnet rotor and the stator core increases, and the torque output can be increased. However, when adjusting the output by this method, it is necessary to prepare multiple types of housings with different diameters, stator cores with different shapes, rotor disks with different diameters, and rotor magnets. Depending on the production volume, the cost becomes very high. In the method disclosed in Patent Document 1, a method is shown in which a plurality of units composed of a single stator and two rotors are arranged in a stacked manner in the axial direction. According to this, a torque output of an integral multiple of the basic structural unit can be secured. The problem of this method is to cope with the design that fills the space between the rotating electrical machines configured in units and to reduce the cost. Since a rotating electrical machine is configured for each unit, bearings, rotor magnets, connection parts, etc. will be used excessively when trying to obtain multiple outputs, which may increase costs. is there. Moreover, when many are piled up in an axial direction, it leads also to losing the characteristic that an axial gap type motor is thin.

  An object of the present invention is to provide a structure capable of adjusting the output of an axial gap type rotating electrical machine without changing the stator core dimensions and the rotor structure yoke dimensions within the same housing frame. .

In order to solve the above problems, for example, the configuration of the claims is adopted.
The present application includes a plurality of means for solving the above-mentioned problem. To give an example, an axial having one stator in the axial direction and first and second rotors on both sides of the stator. A gap type rotary electric machine, wherein a part of permanent magnets for field magnets arranged in the first and second rotors is replaced with a yoke part made of a soft magnetic material. Is.

  In the axial gap type rotating electrical machine of the present invention, a permanent magnet for a field is disposed in the first rotor, and a yoke portion made of the soft magnetic material is disposed in the second rotor. It is characterized by having arranged.

  In the axial gap type rotating electrical machine according to the present invention, a permanent magnet for a field is disposed on either or both of the first rotor and the second rotor, and the permanent magnet is disposed. Is characterized in that only one of the N pole and the S pole is arranged on the surface, and a yoke part made of the soft magnetic material is arranged between the permanent magnet poles.

  According to the present invention, it is possible to adjust the output of the axial gap type rotating electrical machine without changing the stator core dimension and the rotor structure yoke dimension within the same housing frame. In addition, since the number of parts to be prepared is reduced, even when various types are prepared, it is possible to produce at low cost. And since the axial gap type motor can be configured thinly and many types of models can be realized while maintaining the advantages of high efficiency, it can be applied to industrial machines as described above. It can contribute to efficiency.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

It is a perspective view which shows the relationship between the stator and rotor of an axial gap type rotary electric machine which concern on Example 1 of this invention. It is sectional drawing which shows the relationship between the stator and rotor of an axial gap type rotary electric machine which concern on Example 1 of this invention. It is explanatory drawing explaining the structure of a general radial gap type rotary electric machine. It is explanatory drawing explaining the structure of a general axial gap type rotary electric machine. It is sectional drawing which shows the structure of the industrial axial gap type rotary electric machine which has the soft-magnetic yoke rotor of this invention. It is a perspective view explaining the rotor structure of Example 1 of this invention. It is sectional drawing which shows the various forms for implement | achieving the rotor of Example 1 of this invention. It is a perspective view which shows the rotor structure which concerns on Example 2 of this invention. It is a perspective view which shows the other rotor structure which concerns on Example 2 of this invention. It is a perspective view which shows the rotor structure which concerns on Example 3 of this invention. It is sectional drawing for demonstrating operation | movement of the rotor structure of this invention. It is sectional drawing for demonstrating operation | movement of the rotor structure which reduces the magnet of this invention. It is sectional drawing of the industrial axial gap type rotary electric machine which has the rotor structure which concerns on Example 4 of this invention. It is sectional drawing which shows the pump structure which mounts the axial gap type rotary electric machine which concerns on Example 5 of this invention. It is sectional drawing which shows the scroll compressor structure which mounts the axial gap type rotary electric machine which concerns on Example 6 of this invention. It is sectional drawing which shows the screw compressor structure which mounts the axial gap type rotary electric machine which concerns on Example 7 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

  1A and 1B are a perspective view and a cross-sectional view showing a relationship between a stator and a rotor of an axial gap type rotating electric machine according to Embodiment 1 of the present invention.

  The axial gap type rotating electrical machine shown in FIGS. 1A and 1B includes one stator 300 and two rotors (first rotor and second rotor) 100 and 200. The two rotors 100 and 200 are disposed on both sides of the stator 300, are attached to the rotating shaft 7, and rotate. The stator 300 includes a plurality of stator cores 1 and a stator coil 2 provided around each stator core.

  A first rotor 100 shown on the lower side of the drawing is a rotor having a permanent magnet 3. The permanent magnet rotor has a structure in which magnetic poles paired with an N pole and an S pole are periodically arranged in the rotation direction. In FIG. 1A, the ring-shaped disk-shaped magnet has a structure in which 10 poles are arranged in the circumferential direction. One magnetic pole has a fan shape and is arranged on the circumference at an equiangular pitch. A similar rotor structure can also be obtained by attaching a plurality of divided magnets per one pole. As shown in the cross-sectional view of FIG. 1B, the permanent magnet rotor 100 usually has a yoke portion 4 between the permanent magnet 3 and the structure rotor yoke 5. The yoke part 4 is made of a soft magnetic material in order to pass the magnetic flux from the permanent magnet. Since the magnetic flux of the permanent magnet 3 is a direct current component and is less affected by eddy current loss, the magnetic body on the back side of the magnet may be made of carbon steel (S45C) or magnetic stainless steel. When the purpose is to increase the efficiency of the motor, the yoke part 4 having a structure that hardly generates eddy current is configured to suppress the eddy current loss caused by the rotating magnetic field and the alternating magnetic field generated on the stator side. There is a case.

  In the present embodiment, as shown in FIG. 1A or 1B, the disk-shaped second rotor 200 on the upper side of the drawing has a structure that does not have a permanent magnet. By carrying out like this, it becomes possible to reduce the amount of magnet magnetic flux with the same physique, and to reduce an output. At this time, the second rotor 200 having no magnet is constituted by the yoke portion 4 and the structure yoke portion 5. The yoke portion 4 is required to have a structure in which eddy current loss is unlikely to occur because the AC fundamental wave magnetic flux from the stator is always passed. In the present embodiment, a structure is shown in which a yoke portion 4 constituted by winding a magnetic steel plate (silicon steel plate) in a spiral shape is fixed to the structure yoke portion 5 by using methods such as press fitting, bonding, and welding. The electrical steel sheet is silicon-containing iron having a thickness of 0.3 to 0.5 mm, and its surface is insulated. For this reason, since the iron core wound up in a spiral shape is connected by iron in the circumferential direction, it is easy to flow magnetic flux, but it has a structure that can cut off the current in the direction perpendicular to the flowing direction. In addition, there is an effect of preventing the occurrence of eddy current loss. By configuring the rotor composed only of this soft magnetic material as one rotor, it is possible to reduce the amount of magnetic flux supplied by the permanent magnet and adjust the output. Further, since it is not necessary to change the dimensions of the structure yoke 5 and the stator core at this time, there is an effect that productivity can be improved even when a plurality of types of outputs are produced.

  2A and 2B are perspective views showing a structural comparison between a general radial gap type rotating electrical machine and an axial gap type rotating electrical machine, respectively. 2A shows a radial gap type rotating electrical machine, and FIG. 2B shows an axial gap type rotating electrical machine. In this comparative example, both are illustrated assuming that they are mounted on the same housing 10. In the radial gap type rotating electrical machine shown in FIG. 2A, a stator core 1 in which electromagnetic steel sheets having grooves for mounting windings (coils) 2 called slots are laminated in the axial direction is formed on the inner diameter portion of the housing 10. Furthermore, the rotor which mounted the permanent magnet 3 on the rotating shaft 7 is comprised in the inner part. At this time, the opposing area of the rotor and the stator is determined by the diameter φd and the axial length L of the rotor, and the size is π × φd × L. Since the rotor diameter is inside the stator with respect to the diameter of the housing, φd is small. In FIG. 2A, reference numeral 8 represents a bearing, and reference numeral 9 represents an end bracket.

On the other hand, the axial gap type rotating electrical machine shown in FIG. 2B is shown having a rotor on which two permanent magnets 3 are mounted. In this structure, the opposing area of the rotor and the stator core 1 is large because the rotor diameter φD can be used up to the full inner diameter of the housing. In the illustrated model, the facing area is π / 4 × φD ² × 2. This value is about three times higher in this model than the radial gap type rotating electrical machine shown above. From this, it can be seen that the axial gap type rotating electrical machine has an advantage that a larger torque can be obtained than the radial gap type rotating electrical machine when mounted in a housing having the same diameter.

  However, in the case of a radial gap type rotating electrical machine, the torque output can be adjusted by changing the length L in the axial direction. Therefore, the stator core 1 having the same cross section is constituted by a thin steel plate having a thickness of 0.3 to 0.5 mm, which is called an electromagnetic steel plate or a silicon steel plate, and the stator core and the rotor core are laminated by laminating them. Can be formed. As a result, when torque is required, the rotor and stator of the same cross section can be configured to extend as much as possible in the axial length direction, so there are several types with a single mold (core shape, housing dimensions). A motor with a different output can be configured. On the other hand, in the axial gap type rotating electric machine, even if the stator core is extended in the axial length, it is difficult to adjust the output because the amount of the magnet field cannot be increased. In the axial gap type rotating electrical machine, the element corresponding to the core thickness (axial length) of the radial gap type rotating electrical machine is a radial dimension. When the dimension in the radial direction is changed, the gap facing area between the magnet rotor and the stator core increases, and the torque output can be increased. However, when adjusting the output by this method, it is necessary to prepare multiple types of housings with different diameters, stator cores with different shapes, rotor disks with different diameters, and rotor magnets. Depending on the production volume, the cost becomes very high.

  Therefore, in the present invention, the adjustment is performed by applying the rotor structure composed only of the soft magnetic material described above as the output adjustment method of the axial gap type rotating electrical machine. The torque of the rotating electrical machine is proportional to the product of the area where the rotor and stator oppose each other via a gap (hereinafter referred to as “gap facing area”) and the magnetic flux supply amount (magnet strength) of the magnet. For this reason, by eliminating the magnet on one side, it is possible to reduce the output by halving the supply amount of the magnetic flux. At this time, an output larger than half can be expected due to the effect of closing the gap in the portion where the magnet on one side was disposed. Normally, adjustment is possible in the output range of 60 to 80%, depending on the gap size. As a result, the output can be adjusted within the same housing frame without changing the axial length, the stator core shape, the rotor structure yoke, and the like. In addition, since the amount of magnets used can be reduced, a cost reduction effect can be obtained. Further, by adjusting the rotor gap size, the output can be adjusted to 50% or less.

  FIG. 3 shows a cross-sectional view of an industrial axial gap type rotating electrical machine having the soft magnetic yoke rotor 200 of the present embodiment. With respect to the stator 300, the left side of the drawing is the rotor 100 having magnets, and the right side is the soft magnetic yoke rotor 200. In the model shown here, it is shown that the housing 10 can be configured by using the parts constituting the original axial gap type rotating electrical machine as they are. The component parts such as the shaft 7, the end bracket 9, and the bearing 8 have the same dimensions, and the structure yoke 5 can also be configured by using the same one on the left and right. Therefore, the axial length of the yoke part 4 of the right rotor 200 is a dimension obtained by combining the dimension of the magnet 3 of the original design and the axial dimension of the yoke part 4. In FIG. 3, the code | symbol 21 represents an external fan fan and the code | symbol 22 represents a fan cover.

  FIG. 4 is a perspective view for explaining a specific structure of the rotor 200 having only a yoke. FIG. 4A is an exploded view of the structure yoke 5 and the yoke portion 4, and FIG. 4B is a view in which the structure yoke 5 and the yoke portion 4 are combined. In this embodiment, the disk-shaped structure yoke 5 has a guide portion 55 for holding and positioning inside and outside by lathe processing or the like. In accordance with the guide portion 55, an iron core (a yoke portion 4) formed by winding an electromagnetic steel plate (silicon steel plate) in a spiral shape is integrated with the structure yoke 5 by using a method such as adhesion, press-fitting, or welding. To do. At this time, since the spiral iron core of the magnetic steel sheet is wound, residual stress remains in the iron core, so it has a spring back like a spring and may lead to an increase in iron loss (hysteresis loss) in the iron core. There is. For this reason, assembling what has been subjected to the annealing treatment is considered to be effective in improving the performance. Moreover, since this yoke part 4 rotates, it can also be set as the structure which guides an outer part part thickly or firmly, in order to improve the intensity | strength with respect to a centrifugal-resistant force. In that case, when the structure yoke 5 is a metal body, the diameter of the yoke portion 4 is set so that the coils arranged around the stator core and the periphery thereof are arranged so as not to cause eddy current loss due to the influence of magnetic flux from the stator. Measures such as making it larger than the outer diameter part of the arranged part are effective. In addition, when the motor torque is not large, the structure yoke 5 can be made of a non-magnetic material such as a resin material or a non-conductive material. Furthermore, in order to increase the strength against centrifugal force, it is one of the measures to configure the outer peripheral portion with a high strength member such as carbon fiber or glass fiber.

  In FIG. 5, the structure of the 2nd rotor 200 which has various yoke parts 4 is shown. FIG. 5A shows an example of the spiral iron core 4a shown in FIG. The spiral iron core 4a can be changed depending on the efficiency level of the motor. In the case of electrical steel sheets, when demands to reduce iron loss are severe, high grade silicon steel sheets with a thickness of 0.1 mm or 0.2 mm are used, and the use of directional silicon steel sheets is also utilized from the flow of magnetic flux. Is possible. In addition, when the loss is not a concern, it is possible to use a 0.5 mm or 0.75 mm thick electromagnetic steel sheet or a cold rolled steel sheet (SPCC). Moreover, when it is desired to significantly reduce the loss, use of a soft magnetic material such as an amorphous metal foil strip having a thickness of 0.025 mm or fine mete may be considered. In the case of a design in which the magnetic flux density is greatly increased, it is possible to use a permendur iron plate. Various soft magnetic materials can be used because they can be configured with only the slits in the width direction. FIG. 5B shows a modification in which the yoke portion 4b is solid. As a material constituting the solid yoke portion 4b, a dust core having a low electrical conductivity, ferrite, or the like can be considered. FIG. 5C shows an example in which the yoke portion 4c and the structure yoke 5 are integrated (same material). When there is no need to worry about the generation of eddy currents, such as in the case of a low-frequency motor that does not need to worry about an increase in iron loss, it can be made of a soft magnetic material that generates a flow of magnetic flux. It can also be made of electromagnetic stainless steel having a high resistance value while having magnetism. FIG. 5D is an example of suppressing the generation of eddy current loss while being integrated with the structure yoke. Even if the spiral iron core as shown in FIG. 5A is not used, the same effect can be obtained by performing the spiral or concentric groove processing 4d on the structure 5.

  According to this embodiment, one of the two rotors arranged on both sides of the stator is a rotor having a yoke made of a soft magnetic material, so that the stator core dimensions and rotation can be made within the same housing frame. The output adjustment of the axial gap type rotating electrical machine can be performed without changing the dimensions of the substructure yoke.

  6A and 6B are perspective views showing a rotor structure according to Embodiment 2 of the present invention. The example which improves the performance of a rotary electric machine by the variation of the yoke rotor 200 is shown. FIG. 6A shows a structure in which a radial groove 44 is formed in the yoke portion 4. Torque pulsations such as cogging torque and torque ripple generated by the flow of magnetic flux are generated in a rotating electrical machine including a permanent magnet. Since this ripple is generated periodically, it is possible to cancel the pulsation by generating a reverse ripple in a direction to suppress the generation. The rotor structure of the present embodiment, which is made only of a yoke, can be configured to generate reverse torque for canceling torque pulsation by processing the surface or creating a shape in advance. Although the radial groove 44 is formed in FIG. 6A, a radial protrusion may be formed.

  In addition, in an industrial machine, there is a case where the torque of the machine itself varies. For example, in a reciprocating type (cylinder, piston structure) compressor or the like, torque pulsation occurs once per rotation. Thereby, the motor side also receives the reaction. In such a case, the reaction can be reduced by attaching the counterweight 24 to the rotor 200. Since the rotor structure of the present invention does not have a magnet, it is possible to freely arrange a weight or the like that may disturb the magnetic flux of the magnet. FIG. 6B is a structural example having a counterweight 24 on the back side of the rotor.

  FIG. 7 shows a rotor structure for reducing magnets according to a third embodiment of the present invention. FIG. 7 (a) is an exploded perspective view of the rotor of this embodiment, FIG. 7 (b) is a perspective view of the assembled rotor, and FIG. 7 (c) is a cross-sectional view of FIG. 7 (b). FIG. The rotor magnetic pole on the side having the magnet is always composed of a pair of N poles and S poles, and is an even pole. By deleting this even-numbered magnet (N pole or S pole) and using it as a yoke, the amount of magnets can be reduced. FIG. 7 shows an example of 10 poles (5 pole pairs). In this case, only the surface with the south pole is left, and the magnet with the surface north pole is omitted. In this case as well, even if the amount of magnet is halved, a torque larger than half the torque can be expected due to the change in the gap amount.

  FIG. 8 illustrates the flow of magnetic flux when a part of the magnet is replaced with a yoke. Fig.8 (a) is sectional drawing at the time of fully mounting a magnet on two rotors. The north and south poles of the rotor face each other alternately above and below the stator, and the magnetic flux emitted from the north pole surface enters from the south pole surface of the magnet on the opposite side through the stator. A magnetic path that passes through the yoke portion 4 and enters the magnet 3 adjacent to the yoke portion 4 is formed.

  FIG. 8B shows a structure having a rotor in which one side of Example 1 is only a yoke part. Also at this time, the magnetic flux from the north pole of the lower rotor magnet 3 passes through the stator, passes through the yoke portion 4 of the upper rotor, and from another stator, the S of the lower rotor magnet 3. It can be seen that the same magnetic path as that shown in FIG. Since the amount of magnetic flux linked to the stator at this time is the same as in the original case, it can be seen that the performance is not greatly deteriorated. Compared to the state shown in FIG. 8A, the inductance of the winding increases due to the reduction of the magnetic resistance due to the change of the portion of the upper rotor having the magnet 3 to the yoke portion 4, so that the operating point is increased. In order to change, it is necessary to adjust the number of turns of the winding. However, as described above, even if the magnet amount is halved, the output performance is not halved. Therefore, a cost reduction effect can be expected.

  Next, FIG. 9 illustrates a magnet amount reduction method of the third embodiment, which is different from the case of FIG. In the case of FIG. 8B, the magnet is replaced with a yoke on one side of the rotor, and in the figure the upper side of the rotor, but FIG. 9A shows the structure of both the upper and lower side rotors. It shows how to halve each magnet. As shown in FIG. 7, the same magnetic path can also be configured by replacing one side pole of a pair of magnets with a yoke and staggering them vertically. Also in this case, since the amount of magnetic flux emitted from the magnet surface is the same, almost the same performance as in FIG. 8B can be expected.

  FIG. 9B shows a structure in which the number of magnets is further reduced. FIG. 9A shows a structure in which all the upper rotor magnets 3 are eliminated. Also in this case, the magnetic flux emitted from the N pole surface of the magnet 3 of the lower rotor passes through the stator magnetic pole, passes through the yoke 4 of the upper rotor, passes through another stator magnetic pole, and rotates downward. It can be seen that a magnetic path returning to the child is formed. In this case as well, the effect of reducing the magnetic resistance and adjustment to change the inductance of the winding are required, but the performance with respect to the amount of magnet used is advantageous.

  According to this embodiment, by replacing part or all of the magnets of the upper rotor and / or the lower rotor with a yoke made of a soft magnetic material, the stator core dimensions and rotation can be made within the same housing frame. The output adjustment of the axial gap type rotating electrical machine can be performed without changing the dimensions of the substructure yoke.

FIG. 10 shows a rotor structure according to Embodiment 4 of the present invention. In this embodiment, the diameter of a rotor having a magnet is changed as means for changing the amount of magnetic flux of the magnet. The output can be adjusted by changing the diameter φ of the rotor 100 having the magnet on the left side of the drawing. That is, since the opposing area of the rotor magnet 3 and the stator core 1 is π / 4 × φ ² , the output can be adjusted by changing the diameter φ of the rotor 100.

  Example 5 uses the axial gap type rotating electrical machine of the present invention for a pump.

  FIG. 11 is a cross-sectional view illustrating a pump structure for mounting an axial gap type rotating electric machine according to the fifth embodiment of the present invention. In this embodiment, a structure in which a pump impeller 31 is mounted on an output shaft 7 of an axial gap type rotating electrical machine is shown. Usually, the pump is used for the purpose of adjusting the pressure of oil, water, or the like or transporting the liquid. The impeller 31 is disposed in water or oil. Liquids such as water and oil are sucked from the right side and discharged from a discharge pipe (not shown). In the present embodiment, the rotor on one side of the axial gap type rotating electrical machine is separated through a partition wall 32 that separates the pump chamber 33 and the motor mounting portion. The output shaft 7 has a structure that is sealed and connected. The yoke portion 4 is mounted on the pump impeller surface of the partition 32 on the output side. Thereby, there exists an effect that the one-sided structure of a rotor can be omitted.

  In Example 6, the axial gap type rotating electrical machine of the present invention is used in a scroll compressor.

  FIG. 12 is a cross-sectional view showing a scroll compressor structure for mounting an axial gap type rotating electrical machine according to the sixth embodiment of the present invention. The scroll type compressor has a structure in which a motor and a scroll compression mechanism 36 are mounted in a compression container 35. The scroll compression mechanism 36 is a conventional one. A rotor of an axial gap type rotating electrical machine is coupled to a rotating shaft 7 for rotating the scroll compression mechanism 36 to transmit torque. Here, an example is shown in which a counterweight 24 is attached to one rotor of the axial gap type rotating electrical machine of the present invention. The scroll compression mechanism 36 also has torque fluctuations generated per rotation, and a structure for suppressing this is required.

  In Example 7, the axial gap type rotating electrical machine of the present invention is used for a screw compressor.

  FIG. 13: is sectional drawing which shows the screw compressor structure which mounts the axial gap type rotary electric machine of Example 7 of this invention. The screw compression mechanism 38 is a conventional one. A rotor of an axial gap type rotating electrical machine is coupled to a shaft from the screw compression mechanism 38 to transmit torque.

  In this structure, an assembly method in which the screw compressor 38 is first assembled and the motor is coupled is often employed. First, the right rotor comprising the yoke portion 4 and the structure yoke 5 is attached to the shaft 7 coming out from the case 39 of the screw compression mechanism 38. Next, the stator of the axial gap type rotating electrical machine integrated with the housing 10 is attached. Finally, the left rotor composed of the magnet 3, the yoke portion 4, and the rotor structure yoke 5 is attached.

  If the rotor attached first is a rotor having a magnet, a large attraction force will be generated when the stator is attached, making it difficult to assemble. In this way, attach a rotor that does not have a magnet first. As a result, there is no generation of suction force, and assembly can be performed smoothly.

DESCRIPTION OF SYMBOLS 1 Stator core 2 Stator coil 3 Permanent magnet 4 Rotor yoke part 5 Rotor structure yoke 7 Rotating shaft 8 Bearing 9 End bracket 10 Housing 21 Outer fan Fan 22 Fan cover 24 Counterweight 31 Pump impeller 32 Pump partition 33 Pump chamber 35 Compression container 36 Scroll compression mechanism 38 Screw compression mechanism 39 Screw compressor case 44 Radial groove 55 Guide portion 100 First rotor 200 Second rotor 300 Stator

Claims (10)

An axial gap type rotating electrical machine having one stator in the axial direction and first and second rotors on both sides of the stator,
An axial gap type rotating electrical machine characterized in that a part of permanent magnets for field magnets arranged in the first and second rotors are replaced with a yoke portion made of a soft magnetic material. In the axial gap type rotating electrical machine according to claim 1,
In the first rotor, a permanent magnet for a field is arranged,
An axial gap type rotating electrical machine characterized in that a yoke portion made of the soft magnetic material is disposed in the second rotor. In the axial gap type rotating electrical machine according to claim 2,
The yoke part of the second rotor has a non-magnetic gap in a direction to electrically cut off eddy currents perpendicular to the direction of the magnetic flux flowing in the direction of the yoke by the soft magnetic material. An axial gap type rotating electrical machine characterized by comprising: In the axial gap type rotating electrical machine according to claim 2,
The yoke portion of the second rotor has a wound iron core structure formed by winding a soft magnetic material such as an electromagnetic steel plate, an amorphous metal foil strip, a cold rolled steel plate, and permendur in a spiral shape. Axial gap type rotating electrical machine. In the axial gap type rotating electrical machine according to claim 2,
The yoke portion of the second rotor is provided with an iron core structure formed of a dust core or ferrite. In the axial gap type rotating electrical machine according to claim 1,
A permanent magnet for a field is disposed on either or both of the first rotor and the second rotor,
As for the arrangement of the permanent magnet, only one of the N pole and the S pole is arranged on the surface,
An axial gap type rotating electrical machine characterized in that a yoke portion made of the soft magnetic material is disposed between permanent magnet poles. In the axial gap type rotating electrical machine according to any one of claims 2 to 5,
An axial gap type rotating electrical machine, wherein a radial groove or protrusion is formed on a surface of the second rotor. The axial gap type rotating electrical machine according to any one of claims 1 to 6,
An axial gap type rotating electrical machine, wherein a counterweight is attached to the first rotor or the second rotor.   The pump which mounts the axial gap type rotary electric machine of any one of Claims 1 thru | or 8.   The compressor which mounts the axial gap type rotary electric machine of any one of Claims 1 thru | or 8.

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