WO2010150492A1 - アキシャル型モータ - Google Patents
アキシャル型モータ Download PDFInfo
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- WO2010150492A1 WO2010150492A1 PCT/JP2010/004031 JP2010004031W WO2010150492A1 WO 2010150492 A1 WO2010150492 A1 WO 2010150492A1 JP 2010004031 W JP2010004031 W JP 2010004031W WO 2010150492 A1 WO2010150492 A1 WO 2010150492A1
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- magnetic body
- gap
- rotor
- magnetic
- permanent magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
- H02K1/2795—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2796—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets where both axial sides of the rotor face a stator
Definitions
- the present invention relates to an axial type motor in which a magnetic pole of a stator and a permanent magnet installed on a rotor are arranged opposite to each other in a direction parallel to a rotation axis.
- An axial motor having a configuration in which a magnetic pole of a stator and a permanent magnet of a rotor are arranged to face each other in a direction parallel to the rotation axis is known.
- Such an axial type motor has the advantage that it can be miniaturized and can have a higher output. Therefore, the axial type motor is used for various applications.
- the axial type motor has a configuration as shown in Patent Document 1, Patent Document 2, and the like, for example. More specifically, the axial type motor includes a rotor in which a plurality of fan-shaped permanent magnets are arranged in an annular shape on the surface of an iron core made of soft iron or the like, and the permanent magnet is parallel to the rotation axis. And a stator having a coil that forms magnetic poles facing each other. The direction of the magnetic pole of each permanent magnet (the direction connecting the N pole and the S pole) is parallel to the rotation axis, and the adjacent permanent magnets are arranged so that the directions of the magnetic poles are opposite to each other.
- Such an axial type motor has a problem that torque pulsation (cogging torque) is likely to occur, and a method for preventing this problem has been proposed in, for example, Patent Document 3.
- the outline of the coil and the outline of the permanent magnet are each substantially straight in the direction intersecting the rotor rotation direction, and the coil outline when the rotor is rotating.
- An axial type motor is described in which a wire and a contour line of a permanent magnet are set in contact with and away from each other in a rotor rotation direction in a non-parallel state.
- Patent Document 4 describes an axial motor having a configuration in which a magnetic body is disposed between permanent magnets in a rotor.
- the amount of permanent magnets can be reduced by the amount of the magnetic body.
- the magnet torque is reduced by the amount of permanent magnets
- the reluctance torque can be used by providing a magnetic material, so that the total motor torque can be maintained. Thereby, the quantity of permanent magnets can be reduced without reducing the torque as a whole.
- Patent Document 4 proposes an axial type motor having a configuration in which a magnetic material is provided on at least the surface of each permanent magnet. With such a configuration, the reluctance torque can be further increased. Thereby, it is possible to further suppress a decrease in torque as a whole while reducing the amount of permanent magnets.
- JP-A-6-38418 Japanese Patent Laid-Open No. 2001-57753 JP 2005-130692 A JP 2005-94955 A
- the present invention has been made in view of the above circumstances, and an object thereof is to provide an axial type motor that can achieve high output (high torque) and high efficiency (miniaturization).
- An axial type motor according to the present invention is disposed between a pair of stators having coils, and rotates with a gap alternately between a permanent magnet and a second magnetic body sandwiched between a pair of first magnetic bodies.
- a plurality of rotors are provided in the direction.
- the axial motor having such a configuration can perform field-weakening control because the permanent magnet is sandwiched between the first magnetic bodies, and can generate reluctance torque because the second magnetic body is provided. Since the gap is provided, a large amount of magnetic flux generated from the permanent magnet can flow out to the coil side. For this reason, the axial motor having such a configuration can achieve high output (high torque) and high efficiency (miniaturization).
- FIG. 3A is a perspective view illustrating a configuration of a stator core
- FIG. 3B is a plan view illustrating a configuration of a stator.
- FIG. 3A is a diagram illustrating a configuration of a stator in the axial type motor illustrated in FIG.
- FIGS. 4A and 4B are diagrams for explaining the configuration of the rotor in the axial type motor shown in FIG. 1.
- FIG. 4A is a plan view showing the configuration of the surface of the rotor
- FIG. 2 is an assembly diagram of a rotor in the axial type motor shown in FIG. 1. It is a figure for demonstrating the relationship between the outline of a 1st magnetic body and a 2nd magnetic body, and the outline of a coil in the axial type motor shown in FIG. It is the figure shown about each dimension of the axial type motor used for the Example. It is a graph which shows the relationship between the electric potential phase and average torque of the axial type motor in the Example shown in FIG. 7, and the conventional motor. It is a graph which shows the relationship between the rotational angle and torque of the axial type motor in the Example shown in FIG. 7, and the conventional motor.
- FIG. 1 is a schematic sectional view showing a configuration of an axial motor according to the present embodiment
- FIG. 2 is a partial sectional perspective view of the axial motor according to the present embodiment.
- FIG. 2 is a cross-sectional view of an axial motor including planes that include a rotation axis and are orthogonal to each other.
- the axial motor 100 includes a disk-like rotor (rotor) 2 fixed to a rotating shaft 3 rotatably supported by a casing 4, and a surface side of the rotor 2.
- the front side and the back side of the rotor 2 are the stator 1 side in the rotor 2. More specifically, the front surface side and the back surface side of the rotor 2 are surfaces that are substantially perpendicular to the rotating shaft 3 in the rotor 2, and the pair of stators 1 are respectively rotated with respect to the rotor 2. 3 is located in a direction parallel to 3. Further, a gap 13 (third gap) that is a gap is formed between the rotor 2 and the stator 1.
- the gap 13 may be about 0.5 mm, for example.
- the first and second magnetic bodies 21 and 22 are installed on the front and back surfaces of the rotor 2.
- a plurality of permanent magnets 23 are provided so as to be sandwiched between the first magnetic bodies 21.
- the stator 1 is fixedly arranged inside the casing 4 and has a substantially annular shape.
- the stator 1 includes a permanent magnet 23 and a coil 12 that forms a magnetic pole that faces in a direction parallel to the rotation shaft 3.
- FIG. 3A and 3B are diagrams for illustrating the configuration of the stator according to the present embodiment.
- FIG. 3A is a perspective view illustrating the configuration of the stator core
- FIG. 3B is the configuration of the stator.
- FIG. The stator 1 has a stator core 1a shown in FIG.
- the stator core 1 a which is a magnetic body, has a substantially annular shape and has a plurality of teeth 11 that protrude from the surface facing the rotor 2.
- the plurality of teeth 11 are arranged along the shape of the substantially annular stator 1 so as to draw a substantially circular shape at a predetermined interval in the circumferential direction.
- a conductive wire is wound around each tooth 11 to form a coil 12.
- a magnetic pole is formed in the coil 12 by passing a current through the conducting wire.
- the stator 1 and the permanent magnet 23 are arranged so that the magnetic pole and the permanent magnet 23 face each other in a direction parallel to the rotation shaft 3. Therefore, by sequentially passing current through the plurality of coils 12, the plurality of teeth 11 are sequentially magnetized to generate a rotating magnetic field.
- FIG. 4A and 4B are diagrams for explaining the configuration of the rotor according to the present embodiment.
- FIG. 4A is a plan view showing the configuration of the surface of the rotor
- FIG. 1 is a sectional view taken along line IVB-IVB of FIG.
- a first magnetic body 21 and a second magnetic body 22 are installed on the surface of the rotor 2.
- the first magnetic body 21 and the second magnetic body 22 have a substantially fan shape in plan view, and are alternately installed around the rotation shaft 3 along the rotation direction.
- the first magnetic body 21 is disposed so as to cover the permanent magnet 23 from the stator 1 side.
- the 1st magnetic body 21 is each installed in the surface and back surface of the rotor 2, and the permanent magnet 23 is pinched
- the second magnetic body 22 is continuous from the front surface to the back surface of the rotor 2 and is installed so as to penetrate the rotor 2.
- a gap 24 (second gap) is formed between the first magnetic body 21 and the second magnetic body 22.
- the gap 24 refers to a magnetic gap. That is, as the gap 24, a gap that is merely a physical space may be formed between the first magnetic body 21 and the second magnetic body 22, or a non-magnetic body may be provided between them.
- the first magnetic body 21 and the second magnetic body 22 are held and fixed by a holding member 25 that is a main body of the rotor 2.
- a plurality of permanent magnets 23 are arranged around the rotation shaft 3 along the rotation direction.
- These permanent magnets 23 are flat plates that are substantially fan-shaped in plan view, and are installed such that the direction of the magnetic poles is substantially parallel to the rotating shaft 3.
- the direction of the magnetic pole is a direction connecting the N pole and the S pole, and specifically, the normal direction of the surface that becomes the N pole and the surface that becomes the S pole of the permanent magnet 23.
- the direction of the magnetic pole of the adjacent permanent magnet 23 is arrange
- the magnetic poles on one surface of the permanent magnet 23 are arranged so that the S and N poles alternate in the adjacent permanent magnets 23.
- the second magnetic body 22 penetrating from the front surface to the back surface of the rotor 2 is positioned as described above.
- a gap 26 (first gap) is formed between the adjacent permanent magnet 23 and the second magnetic body 22.
- a gap 27 is also formed between the adjacent permanent magnets 23.
- the gaps 26 and 27 are magnetic gaps, and may be simply a gap that is a physical space, or the gap may be filled with a nonmagnetic material.
- each permanent magnet 23 is covered with the first magnetic body 21 on the stator 1 side, and the second magnetic body 22 is provided between the adjacent permanent magnets 23 and between the adjacent first magnetic bodies 21. Is installed.
- a gap 26 is formed between the second magnetic body 22 and the permanent magnet 23 adjacent to the second magnetic body 22, and the second magnetic body 22 and the first magnetic body adjacent to the second magnetic body 22 are formed.
- a gap 24 is formed between them 21.
- the rotor 2 has the holding member 25 that is a main body thereof, and the first magnetic body 21 and the second magnetic body 22 are held by the holding member 25.
- a frame may be formed on the holding member 25, and the first magnetic body 21 and the second magnetic body 22 may be fitted into the frame to be held.
- FIG. 5 is an assembly diagram of the rotor of the axial motor according to the present embodiment. As shown in FIG. 5, frames (openings) 21 a and 22 a are formed in the holding member 25 so that the first magnetic body 21 and the second magnetic body 22 are fitted therein.
- the first magnetic body 21 is fitted into the frame 21a from the front surface and the back surface of the rotor 2 so as to sandwich the permanent magnet 23 from the front surface and the back surface.
- the permanent magnet 23 and the first magnetic body 21 are formed with threaded through-holes, and the through-holes formed in the permanent magnet 23 and the first magnetic body 21 are joined together and screws are screwed together.
- the permanent magnet 23 is fixed to the first magnetic body 21.
- the first magnetic body 21 is fixed to the holding member 25 because the holding member 25 is sandwiched from both sides by being fastened with bolts.
- the second magnetic body 22 is fixed to the holding member 25 by fitting into the frame 22a.
- the second magnetic body 22 is divided into two parts, which fit into the frame 22a from the front surface and the back surface of the rotor 2.
- the divided second magnetic body 22 is formed with threaded through holes, and by fitting these through holes and screwing bolts, the divided second magnetic body 22 is Become one.
- the second magnetic body 22 is fixed to the holding member 25 because the holding member 25 is sandwiched from both sides by being tightened with a bolt.
- the first magnetic body 21, the second magnetic body 22, and the permanent magnet 23 are fixed to the holding member 25, their positions do not fluctuate.
- a repulsive force and an attractive force are applied to the rotor 2 by the magnetic field generated by the permanent magnet 23 and the coil 12.
- centrifugal force or the like acts on the rotor 2.
- the positions thereof are regulated by the holding member 25, and the positions vary. There is nothing to do.
- the position of the 1st magnetic body 21, the 2nd magnetic body 22, and the permanent magnet 23 can be controlled easily.
- the gap 24 is more firmly fixed by, for example, a configuration in which the space is filled with a non-magnetic material than when the space is formed between the first magnetic body 21 and the second magnetic body 22 as the gap 24. Is done.
- the holding member 25 needs to have a strength capable of withstanding the repulsive force, the attractive force, the centrifugal force and the like due to the magnetic field.
- the holding member 25 is preferably a non-magnetic material so as not to affect the magnetic flux generated by the permanent magnet 23 and the coil 12. Therefore, as the material of the holding member 25, for example, austenitic stainless steel is preferable.
- the holding member 25 has a shape in which frames 21a and 22a for fixing the first magnetic body 21 and the second magnetic body 22 in a radial shape are formed, and is circular. Good.
- the holding member 25 has a shape in which an annular member and several members extending radially from the rotary shaft 3 toward the outer periphery are integrated, that is, for example, a shape such as a bicycle wheel or a water wheel. And it is sufficient.
- the gaps 24, 26, and 27 are formed.
- the permanent magnet 23 is formed.
- the magnetic attraction and repulsion generated between the coil 12 and the permanent magnet 23 can be increased as compared with the case where the gaps 24, 26, and 27 are not formed.
- the magnet torque can be increased. If the gaps 24, 26, and 27 do not exist, the component of the magnetic flux from the permanent magnet 23 increases toward the adjacent (close) permanent magnet 23 or the second magnetic body 22. Since the component flowing in the linear direction is reduced, the magnet torque of the axial motor 100 is reduced.
- the gap length of the gap 24 and the gap 26 is preferably larger than the gap length of the gap 13 formed between the rotor 2 and the stator 1.
- the gap length of the gap 24 and the gap 26 is larger than the gap length of the gap 13, the effect of increasing the magnetic flux in the normal direction of the permanent magnet 23 can be obtained.
- the axial type motor 100 of the same size when the gap lengths of the gap 24 and the gap 26 are increased, the capacities of the permanent magnet 23, the first magnetic body 21, and the second magnetic body 22 are decreased. Therefore, if the gap lengths of the gap 24 and the gap 26 are excessively increased, the magnet torque is decreased.
- the gap length of the gap 24 and the gap 26 is preferably larger than the gap length of the gap 13 and not more than 10 times the gap length of the gap 13.
- FIG. 6 is a diagram for explaining the relationship between the contour lines of the first magnetic body and the second magnetic body and the contour line of the coil. More specifically, FIG. 6 shows the positional relationship between the first magnetic body 21 and the second magnetic body 22 arranged in the rotor 2 and the coil 12 formed by winding a conductive wire around the teeth 11. It is a figure. FIG. 6 is a view as seen from a direction parallel to the rotation shaft 3. Since the rotor 2 rotates, the positional relationship changes at any time. In FIG.
- the contour line 12 a intersecting the rotation direction of the rotor 2 and the contour lines of the first magnetic body 21 and the second magnetic body 22.
- the positional relationship with the contour lines 21b and 22b intersecting with the rotation direction of the rotor 2 is shown.
- the gap 24 has a substantially uniform interval in the rotation direction, the gap 24 is substantially linear, and neither the gap 24 nor the contour 12a is parallel.
- the gap 24 in the rotation direction are substantially uniform, that is, the gap 24 is substantially linear has been described as an example.
- the gap 24 is not necessarily linear. If the center line of the gap 24 intersects with the outline 12a of the coil 12 intersecting with the rotation direction of the rotor 2 and is kept in contact with and separated from the outline 12a, the same effect can be obtained. Obtainable. However, from the viewpoint of easiness of production, it is preferable that the gap 24 has a substantially uniform interval in the rotation direction as shown in FIG.
- the operation of the axial motor according to this embodiment will be described.
- the permanent magnet 23 and the magnetic pole facing in the direction parallel to the rotating shaft 3 are formed in the coil 12.
- the plurality of teeth 11 are sequentially magnetized to generate a rotating magnetic field.
- the rotating magnetic field is generated, the permanent magnet 23 of the rotor 2 interacts with the rotating magnetic field to generate attraction and repulsion, so that the rotor 2 rotates and magnet torque can be obtained.
- the second magnetic body 22 is installed between the adjacent permanent magnets 23, the magnet torque generated by the presence of the permanent magnet 23 is also attracted to the rotating magnetic field with respect to the second magnetic body 22.
- reluctance torque can be obtained.
- the second magnetic body 22 is preferably a ferromagnetic body.
- the installation position of the second magnetic body 22 may be a position that is attracted by the magnetic poles sequentially formed on the stator 1 and promotes the rotation of the rotor 2. That is, the second magnetic body 22 only needs to exist between at least the adjacent permanent magnets 23.
- the axial type motor 100 As described above, in the axial type motor 100 according to the present embodiment, not only the magnet torque but also the second magnetic body 22 is provided, whereby reluctance torque is generated. Therefore, even when the amount of the permanent magnets 23 is reduced, the reduced magnet torque can be compensated by the reluctance torque, and the equivalent torque can be obtained as a whole. That is, even when the size of the axial type motor 100 is reduced by reducing the amount of the permanent magnets 23, the same torque as before the reduction can be realized. Further, since the torque can be increased without increasing the amount of the permanent magnets 23, there is an effect that the output of the axial motor 100 can be increased (high torque).
- the first magnetic body 21 is installed so as to cover the front surface and the back surface of each permanent magnet 23, thereby performing so-called field weakening control. It becomes possible.
- a counter electromotive force is generated in the coil 12 due to a change in magnetic flux caused by the permanent magnet 23 crossing the coil 12. For this reason, when the rotor 2 is rotated at a high speed, the counter electromotive force becomes large, so that a phenomenon occurs in which the rotational speed does not increase even when the drive current is increased.
- the magnetic force of the permanent magnet 23 may be weakened.
- the distance between the coil 12 and the permanent magnet 23 may be increased.
- the torque of the axial motor 100 is reduced by separating these distances. Therefore, as in the axial type motor 100 according to the present embodiment, the first magnetic body 21 covers the front and back surfaces of the permanent magnets 23, so that the coil 12 and the permanent magnet 21 are made permanent by the thickness of the first magnetic body 21.
- the distance from the magnet 23 can be increased, and field weakening control can be performed. Further, since the first magnetic body 21 exists between the permanent magnet 23 and the coil 12, the magnetic fluxes of the permanent magnet 23 and the coil 12 that affect each other are not weakened. Therefore, the torque can be reduced less. As described above, the first magnetic body 21 is installed so as to cover the front surface and the back surface of the permanent magnet 23, so that the field-weakening control effectively acts and the output can be improved at high speed rotation.
- the torque of the motor is generated in principle by an attractive force and a repulsive force between the magnetic field of the permanent magnet 23 and the magnetic field generated by the coil 12. That is, the surface of the permanent magnet 23 enters the magnetic field generated by the coil 12. Since the magnetic field generated by the coil 12 is an alternating magnetic field, if the surface of the permanent magnet 23 is a conductor, an eddy current is generated and an eddy current loss is generated. It is preferable that generation of this eddy current can be suppressed.
- the electrical resistance of the first magnetic body 21 covering the front and back surfaces of the permanent magnet 23 may be increased. Therefore, the axial type motor 100 according to the present embodiment uses a dust core material, which is a material having high electrical resistance, as the first magnetic body 21.
- the second magnetic body 22 enters the magnetic field generated by the coil 12. Therefore, the second magnetic body 22 is also preferably made of a material that suppresses eddy current loss. Therefore, the axial type motor 100 according to the present embodiment uses a dust core material, which is a material having high electrical resistance, as the second magnetic body 22. Thereby, an eddy current can be suppressed, and an effect is obtained that a high torque can be obtained while suppressing an increase in loss.
- FIG. 7 is a diagram showing dimensions of the axial type motor used in the example.
- FIG. 7 corresponds to FIG. 2, and the unit of each dimension is mm.
- FIG. 8 is a graph showing the relationship between the potential phase and the average torque of the axial type motor in the embodiment and the conventional motor.
- FIG. 8 what is represented by a solid line is a measurement result of the axial type motor in the example.
- FIG. 8 what was represented with a broken line is the measurement result by the conventional motor which is a comparative example.
- a conventional motor used as a comparative example a radial motor having the same size as the axial type motor in the embodiment is used.
- both motors have the maximum average torque.
- the average torque of the motor according to the example is 24.28 Nm, while the average torque of the motor according to the comparative example is 14.02 Nm. Therefore, the motor of the embodiment achieves high output.
- FIG. 9 is a graph showing the relationship between the rotational angle and torque of the axial type motor and the conventional motor in the example.
- a solid line is a measurement result by the axial type motor in the embodiment.
- the conventional axial type motor which is a comparative example.
- the fixed value represented by the thin line is the average torque of these motors.
- the contour 12a of the coil 12 is parallel to the gap 24 when the rotor 2 rotates.
- the torque of each comparative angle varies in the comparative example. Therefore, it can be seen that the cogging is larger in the comparative example than in the example.
- the motor according to the embodiment hardly causes cogging.
- the axial type motor 100 according to the embodiment of the present invention can realize further higher output (higher torque) based on the axial type structure proposed so far.
- the axial motor 100 according to the embodiment of the present invention can generate a high torque, even if it is downsized as compared with the conventional motor, it can generate a torque equal to or higher than the conventional one. That is, high efficiency (miniaturization) can be achieved.
- An axial type motor includes a rotor including a plurality of permanent magnets arranged in a rotation direction around a rotation axis and having a magnetic pole direction in a direction parallel to the rotation axis; A pair of stators having a coil that forms the permanent magnet disposed on the rotor and a magnetic pole facing in a direction parallel to the rotation axis, and the directions of the magnetic poles of the permanent magnets adjacent to each other are opposite; Each of the permanent magnets is covered with a first magnetic body on each stator side, and a second magnetic body is installed between the permanent magnets adjacent to each other and between the first magnetic bodies adjacent to each other.
- a first gap is formed between the two magnetic body and the permanent magnet adjacent to the second magnetic body, and the second magnetic body and the first magnetic body adjacent to the second magnetic body A second gap is formed between them.
- the gap is a magnetic gap, and does not necessarily mean that there is a physical space between the second magnetic body and the permanent magnet and between the second magnetic body and the first magnetic body. . That is, the gap is not limited to a configuration that forms a space but may be a configuration in which a non-magnetic material is arranged instead of a space as long as the gap can be blocked as a magnetic circuit.
- the distance between the coil and the permanent magnet can be separated by the thickness of the first magnetic body, and field weakening control can be performed. It can be carried out. Thereby, back electromotive force can be suppressed and the output fall which arises in the case of high speed rotation can be prevented. That is, high-speed rotation is possible.
- the first magnetic body is installed between the permanent magnet and the coil, the permanent magnet and the magnetic flux of the coil that affect each other are not weakened, and the torque can be reduced less.
- the axial motor since the second magnetic body is provided, the axial motor generates reluctance torque. Thereby, the magnet torque which reduces can be compensated by reducing a permanent magnet. Therefore, by reducing the number of permanent magnets, even when the axial type motor is downsized, the reduction in torque can be compensated and high output can be realized. That is, an axial type motor that is small and has high output can be realized.
- the magnet torque of the axial type motor can be increased. That is, the output of the axial motor can be increased.
- the magnetic flux from the permanent magnet is generated from the permanent magnet due to an increase in the component flowing to the adjacent (adjacent) permanent magnet or the second magnetic body. Since the component in the direction parallel to the rotation axis is small, the magnetic torque of the axial type motor is low.
- the first magnetic body is preferably made of a dust core material.
- the electrical resistance of the first magnetic body is high. Therefore, the eddy current generated in the first magnetic body in the AC magnetic field generated by the coil can be suppressed, and the eddy current loss can also be suppressed. Therefore, an increase in loss can be prevented.
- the second magnetic body is made of a dust core material.
- the electrical resistance of the second magnetic body is high. Therefore, the eddy current generated in the second magnetic body in the AC magnetic field generated by the coil can be suppressed, and the eddy current loss can also be suppressed. Therefore, an increase in loss can be prevented.
- the gap lengths of the first gap and the second gap are larger than a gap length of a third gap formed between the stator and the rotor. Is also preferably large.
- the gap length of the first gap and the second gap is larger than the gap length of the third gap, it flows out toward the formation position of the third gap rather than the formation position of the first gap and the second gap.
- the rotor includes a nonmagnetic holding member that holds the first magnetic body and the second magnetic body.
- the first magnetic body and the second magnetic body are fixed to the holding member, and the positions of the first magnetic body and the second magnetic body are caused by the repulsive force or attractive force generated by the magnetic field and the centrifugal force generated by the rotation of the rotor. It does not fluctuate. Further, since the holding member is non-magnetic, it does not affect the magnetic flux generated by the permanent magnet and the coil.
- the outline of the coil that intersects the rotation direction of the rotor, and the center line of the second gap are preferably contacted and separated while maintaining a non-parallel state.
- the intervals in the rotation direction of the rotor are substantially uniform, the second gap is substantially linear, and the coil outline and the substantially linear second gap are in a non-parallel state.
- the term “uniform” is not intended to mean a completely uniform state, but is interpreted to include those that are considered to be approximately uniform by those skilled in the art involved in the technical design of the axial type motor. It is expressed as uniform, and the straight line is not intended to be a completely straight state, but is interpreted to include those that are considered to be roughly a straight line for those skilled in the technical design of the axial type motor, In this sense, it is written as a substantially straight line.
- an axial type motor can be provided.
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Abstract
Description
Claims (7)
- 回転軸の周りに回転方向に沿って配置された、前記回転軸に対して平行な方向に磁極の方向を有する複数の永久磁石を備えた回転子と、
前記回転子に配置された前記永久磁石と前記回転軸に平行な方向で対向する磁極、を形成するコイルを有する一対の固定子とを備え、
互いに隣接する前記永久磁石の磁極の向きは、逆であり、
前記各永久磁石は、前記各固定子側を第1磁性体で覆われ、かつ互いに隣接する永久磁石間および互いに隣接する前記第1磁性体間には第2磁性体が設置され、
前記第2磁性体と、前記第2磁性体に隣接する前記永久磁石との間には第1ギャップが形成され、
前記第2磁性体と、前記第2磁性体に隣接する前記第1磁性体との間には第2ギャップが形成されている、アキシャル型モータ。 - 前記第1磁性体は、圧粉磁心材料で構成されている、請求項1に記載のアキシャル型モータ。
- 前記第2磁性体は、圧粉磁心材料で構成されている、請求項1または請求項2に記載のアキシャル型モータ。
- 前記第1ギャップおよび前記第2ギャップのギャップ長は、前記固定子と前記回転子との間に形成された第3ギャップのギャップ長よりも大きい、請求項1ないし請求項3のいずれか1項に記載のアキシャル型モータ。
- 前記回転子は、前記第1磁性体および前記第2磁性体を保持する、非磁性である保持部材を備えている、請求項1ないし請求項4のいずれか1項に記載のアキシャル型モータ。
- 前記回転子が回転した際に、前記回転子の回転方向に対して交差する前記コイルの輪郭線と、前記第2ギャップの中心線とは、非平行状態を保ちながら接離する、請求項1ないし請求項5のいずれか1項に記載のアキシャル型モータ。
- 前記第2ギャップにおいて、前記回転子の回転方向の間隔は、略均一であって、前記第2ギャップは、略直線状である、請求項6に記載のアキシャル型モータ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10791816.1A EP2448089A4 (en) | 2009-06-23 | 2010-06-17 | AXIAL MOTOR |
KR1020117030807A KR101355257B1 (ko) | 2009-06-23 | 2010-06-17 | 축류형 모터 |
US13/379,506 US9071118B2 (en) | 2009-06-23 | 2010-06-17 | Axial motor |
CN201080027483.4A CN102460905B (zh) | 2009-06-23 | 2010-06-17 | 轴向电动机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2009148257A JP2011010375A (ja) | 2009-06-23 | 2009-06-23 | アキシャル型モータ |
JP2009-148257 | 2009-06-23 |
Publications (1)
Publication Number | Publication Date |
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WO2010150492A1 true WO2010150492A1 (ja) | 2010-12-29 |
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PCT/JP2010/004031 WO2010150492A1 (ja) | 2009-06-23 | 2010-06-17 | アキシャル型モータ |
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US (1) | US9071118B2 (ja) |
EP (1) | EP2448089A4 (ja) |
JP (1) | JP2011010375A (ja) |
KR (1) | KR101355257B1 (ja) |
CN (1) | CN102460905B (ja) |
TW (1) | TWI420783B (ja) |
WO (1) | WO2010150492A1 (ja) |
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JP2013106462A (ja) * | 2011-11-15 | 2013-05-30 | Kazuaki Kobayashi | 回転電機 |
Also Published As
Publication number | Publication date |
---|---|
EP2448089A1 (en) | 2012-05-02 |
KR20120023825A (ko) | 2012-03-13 |
KR101355257B1 (ko) | 2014-01-27 |
CN102460905B (zh) | 2015-07-08 |
JP2011010375A (ja) | 2011-01-13 |
CN102460905A (zh) | 2012-05-16 |
EP2448089A4 (en) | 2014-12-03 |
TW201105004A (en) | 2011-02-01 |
US20120104880A1 (en) | 2012-05-03 |
TWI420783B (zh) | 2013-12-21 |
US9071118B2 (en) | 2015-06-30 |
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