JP4258597B2 - Revolving actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a revolving actuator that can be used as a drive source for industrial machines, consumer machines, and the like that apply eccentric revolving motion.
[0002]
[Prior art]
Conventionally, in order to obtain a revolution motion as an output, it has been common to convert the rotation motion of a stepping motor, a DC motor or the like into a revolution motion by an output conversion mechanism. On the other hand, as disclosed in JP-A-8-205515 and JP-A-11-275851, there are known variable gap type motors, variable reluctance type motors, and the like that directly move the movable part in an eccentric orbital motion. . Since these use electromagnetic force generated in the same direction as the main magnetic flux, they have a feature that low speed and high torque rotation can be obtained.
[0003]
[Problems to be solved by the invention]
However, the method of converting the rotation motion of the stepping motor or the DC motor into the revolving motion by the output conversion mechanism has a problem that it is difficult to reduce the efficiency due to the generation of friction in the output conversion mechanism and to reduce the size of the apparatus. It was happening. On the other hand, a variable gap motor or a variable reluctance type motor has a problem that it is difficult to rotate at high speed because there is a large amount of magnetic flux leakage due to a large gap length compared to a conventional DC motor or the like and a large gap fluctuation. Had.
[0004]
The present invention has been made in view of such a reason, and an object of the present invention is to obtain an eccentric revolution motion as a direct output without using the output conversion mechanism, and to apply the eccentric revolution motion as it is to an industrial machine. Another object of the present invention is to provide a revolving actuator that can be used as a drive source for a consumer machine or the like and that can cope with high-speed rotation because there is no gap fluctuation between the movable part and the fixed part in principle.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the invention of the revolution type actuator according to claim 1, the driving torque is obtained by causing the movable member, whose rotation is restricted by the rotation restriction mechanism, to revolve on a predetermined revolution track surface. in revolution type actuator for generating includes a mover member comprising a conductor, and a plurality of stator that generates a rotating magnetic field to the mover member, wherein the plurality of stator of the rotating magnetic field The magnetic flux penetrates in a direction perpendicular to the revolution track surface of the mover member including the conductor, and a region where the magnetic flux density of the rotating magnetic field is relatively high changes along the revolution track with time. As a result, an electromagnetic force is generated from the eddy current generated in the conductor and the rotating magnetic field, and the movable member is eccentrically revolved around a predetermined eccentric axis, thereby reducing the number of stators. Even one, the area of the orbit plane and directly opposite the cross-section of the mover member is characterized in that it is formed so as to monotonically increases or decreases in the tangential direction of the orbit.
[0007]
In the invention of claim 2, in revolution type actuator according to claim 1, it is characterized in that arranged at least one to shading coil of the stator.
[0010]
According to a third aspect of the present invention, in the revolving actuator according to the first or second aspect , the movable member includes a magnetic body.
[0011]
According to a fourth aspect of the present invention, in the revolving actuator according to any one of the first to third aspects, a movable scroll having spiral wings is coupled to the movable member, and the movable scroll A fixed scroll is combined with each other at the spiral portion, and the movable scroll is revolved with a constant radius around the eccentric shaft, whereby a sealed space formed by the combination of the two scrolls is centered from the outside of the spiral portion. The scroll type pump is configured such that the volume of the sealed space is sequentially reduced and compressed by being moved to the position.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The revolution type actuator of the present invention is not limited to the following embodiments, and it is needless to say that various changes can be made without departing from the gist of the present invention.
[0013]
[First embodiment]
FIG. 1 shows a configuration of a main part of an embodiment of a revolution type actuator of the present invention, where (a) is a top view, and (b) is a schematic sectional view when cut along a section AA ′ in (a). It is. That is, the revolving actuator of the present invention includes a plurality of U-shaped stators (iron cores) arranged so as to be sandwiched in a non-contact manner along the outer peripheral edge portion of the revolving raceway surface of the mover member 1. ) 2, a coil 3 is wound around the stator 2 to form an electromagnet 4 that can generate a magnetic field in the direction of the revolution axis, and a rotation restraining mechanism for preventing the rotation of the mover member 1 is formed. It has a structure provided with an eccentric shaft 5 for revolving the movable member 1 with a constant radius. Further, the mover member 1 includes a conductor 6 made of a metal such as aluminum, and the electromagnetic force generated by the induced current flowing in the conductor 6 and the magnetic field in the direction of the revolution axis is used as a torque. The revolving motion is performed around the eccentric shaft 5.
[0014]
FIG. 2 is a schematic diagram showing an outline of the driving principle of the revolution type actuator of the present invention. That is, the magnetic field (M) of the electromagnet 4 generated by the coil 3 is in the revolution axis direction (perpendicular to the revolution track surface of the movable member 1). Here, the excitation state of the coil 3 is sequentially changed over time to form a rotating magnetic field that rotates a region where a magnetic field generated by the electromagnet 4 exists (that is, a region having a relatively high magnetic flux density) counterclockwise. An induced current (eddy current) (I) flows in the direction shown in FIG. 2 in the conductor 6 of the movable member 1 through which the magnetic flux generated by the rotating magnetic field by the electromagnet 4 passes. In this case, as shown in FIG. 2, since the induced current (I) flows in the magnetic field from the periphery to the center, the electromagnetic force (F) acting between the magnetic field (M) and the induced current (I) is It can be seen that it works counterclockwise as in (M). As a result, the movable member 1 including the conductor 6 can revolve.
[0015]
By adopting such a driving principle, in the revolution type actuator according to the present invention, the magnetic flux related to the generation of the revolution axis and the electromagnetic force is parallel, so there is no principle fluctuation in the gap between the movable part and the fixed part, For this reason, the gap length can be designed to be sufficiently small within a practically most advantageous range, so that it is possible to cope with high-speed rotation. Furthermore, since the revolving motion of the mover member 1 can be obtained as it is without using a conversion mechanism, the structure can be basically simplified, resulting in fewer failures and longer life. At the same time, the economic advantage of being inexpensive to manufacture can be emphasized. In the present embodiment, metals such as aluminum are used as the constituent material of the conductor 6, but it is not particularly limited as long as it has sufficient conductivity to solve the above problems. Needless to say.
[0016]
Further, as shown in FIG. 1, in at least one stator 2a among the plurality of stators 2, a narrow groove 8 (see FIG. 3) is provided in a portion off the center, and a relatively resistance is provided in this portion. A high short-circuit coil (so-called coil coil) 7 can be wound. FIG. 3 is a cross-sectional view schematically showing the operation of the winding coil in the revolution type actuator of the present invention. That is, a part of the magnetic flux generated from the exciting coil 3 by the torsion coil 7 and passing through the stator 2 is linked with the short-circuit coil to generate an induced voltage, thereby reducing the increase in magnetic flux by the exciting coil. As a result, the magnetic flux density (MF1) of the magnetic flux passing through the part where the coiling coil 7 is provided is smaller than the magnetic flux density (MF2) of the magnetic flux passing through the other part of the stator 2, so that it passes through this stator 2. The magnetic flux to be generated forms a moving magnetic field in the left direction, and a starting torque can be advantageously obtained, and the revolving motion of the conductor 6 constituting the movable member 1 can be started earlier.
[0017]
However, the configuration for effectively forming such a moving magnetic field and promoting the start of the revolving motion is due to the arrangement of the winding coil as described above for partially canceling the change of the magnetic flux passing through the stator. As described later, various variations are possible, and a moving magnetic field is formed by partially changing the magnetic flux density distribution passing through at least one of the stators 2. Needless to say, there is no limitation as long as it contributes to the solution of the problem as long as it can promote the revolution start of the conductor 6. Of course, the number and arrangement of the stators 2 on which the coiling coils are arranged are not limited as long as they contribute to the solution of the problem.
[0018]
[Second Embodiment]
FIG. 4 is a top view showing a configuration of a main part of an embodiment different from the above of the revolution type actuator of the present invention. FIG. 5 is a perspective view showing a configuration of a main part of a stator 2b having a shape different from the above in the revolution type actuator of the present invention. That is, in at least one of the stators 2 of the revolution type actuator of the present invention, the cross section 9 facing the conductor 6 of the stator 2b has a width in the normal direction perpendicular to the tangential direction of the revolution track. Has an asymmetrical shape that increases monotonously. As a result, the magnetic flux density in the stator 2b saturates the smaller side of the corresponding cross-sectional area earlier with respect to the length in the tangential direction of the revolution track in the section 9 facing the conductor 6, as a result. In the cross section 9, the magnetic flux density (MF3) of the magnetic flux passing through the smaller side of the corresponding cross-sectional area with respect to the tangential length of the revolution track is equal to the magnetic flux density of the magnetic flux passing through the larger side of the cross-sectional area. Since it becomes smaller than (MF4), a moving magnetic field is generated according to the same principle as the case where the coiling coil 7 is provided, a starting torque can be advantageously obtained, and the starting of the revolving motion can be promoted. . Needless to say, the number, arrangement, and the like of the stator 2 having the asymmetric cross-sectional shape are not limited as long as they contribute to the solution of the problem.
[0019]
[Third embodiment]
FIG. 6 is a top view showing a configuration of a main part of a conductor having a shape different from the above in the revolution type actuator of the present invention. FIG. 7 is a cross-sectional view when the conductor 6a and the stator 2 are cut along the cross-section BB ′ in FIG. That is, the electric conductor 6a of the revolution type actuator of the present invention has a projection surface of the stator 2c on at least one of the stators 2, for example, the stator 2c, on the electric conductor 6a directly facing the stator 2c. As a defect part that breaks the symmetry, the defect part 10 is provided on the conductor 6 at a position that is shifted from the center of the projection surface of the stator 2c. As a result, the magnetic flux generated from the exciting coil 3 due to the induced current flowing in the conductor 6a is reduced, but the center line is a reference on the projection surface of the stator 2c on the conductor 6 facing the stator 2c. As for the side without the partial defect part 10, the influence of the eddy current is larger than the side with the defect part 10, and the magnetic flux density distribution becomes non-uniform. As a result, the magnetic flux density (MF5) of the magnetic flux passing through the side without the defect portion 10 becomes smaller than the magnetic flux density (MF6) of the magnetic flux passing through the side having the defect portion 10, so According to the same principle as described above, a moving magnetic field is generated, a starting torque can be obtained advantageously, and the starting of the revolving motion can be promoted. Further, the number, arrangement, etc. of the stators 2 provided with the defect portions 10 on the corresponding projection plane on the conductor 6 or the shape of the defect portions 10 are not limited as long as they contribute to the solution of the problem. It goes without saying that there is no.
[0020]
[Fourth Embodiment]
FIG. 8 is a schematic cross-sectional view showing a main part of an embodiment in which the movable member 1 is configured to include the magnetic body 11 in addition to the conductor 6 in the revolution type actuator according to the present invention. That is, since the movable member 1 includes not only the conductor 6 but also the magnetic body 11, the eccentric revolving motion can be promoted by the attractive force acting between the magnetic body 11 and the rotating magnetic field. The energy efficiency as an actuator can be improved. In this case, in addition to the electromagnetic force acting between the induced current flowing in the conductor 6 and the rotating magnetic field, the revolving motion can be performed using the attractive force acting between the stator 2 and the magnetic body 11. It can be said that there is a feature of the revolution type actuator of this embodiment. In addition, as a constituent material of the magnetic body 11, magnetic bodies, such as an electromagnetic soft iron and an electromagnetic steel plate, can be illustrated, However, It is not limited only to these, As long as it contributes to the said problem solution, there is no restriction | limiting. Not too long.
[0021]
[Fifth Embodiment]
FIG. 9 is a schematic cross-sectional view showing a configuration of a main part of the embodiment when the revolution type actuator of the present invention is used as a drive source of a scroll pump. That is, the movable scroll 12 having spiral wings is coupled to the movable member 1, and the movable scroll 12 and the fixed scroll 13 are combined with each other at a spiral portion 14 (not shown), whereby the movable scroll 12 is eccentric. By revolving around the shaft 5 with a constant radius, the sealed space formed by the combination of the two scrolls is moved from the outside of the spiral portion 14 to the center side, and the volume of the sealed space is sequentially reduced and compressed. The scroll type pump is constituted. In this case, a part or all of the movable scroll 12 that requires revolving motion is configured using a rare earth or ferrite permanent magnet having a magnetomotive force, a plastic magnet, or a magnetic material such as an electromagnetic steel plate or electromagnetic soft iron. The actuator can be directly driven as the movable member 1 of the actuator. As a result, it is not necessary to attach an extra transmission mechanism or a motor as a drive source under the scroll pump, so that the thickness of the entire pump can be reduced.
[0022]
【The invention's effect】
As described above, in the invention of the revolution type actuator according to the first aspect, the fluctuation of the gap between the movable part and the fixed part does not exist in principle because the revolution axis and the magnetic flux related to the generation of electromagnetic force are parallel. For this reason, the gap length can be designed to be sufficiently small within a practically most advantageous range, so that an excellent effect of being able to cope with high-speed rotation is obtained. In addition, the revolving motion of the mover member can be obtained as it is without using a conversion mechanism, and since the structure is simple, there are few failures and the life can be extended, and at the same time, it can be manufactured at low cost. An excellent effect can also be achieved. Further, in at least one of the stators, a cross section of the stator facing the conductor has an asymmetric shape in which a width in a normal direction perpendicular to the tangential direction of the revolution track monotonously increases. Therefore, the starting torque can be advantageously obtained, and the excellent effect that the starting of the revolving motion can be accelerated can be achieved.
[0024]
In the second aspect of the invention, arranged in revolution type actuator according to claim 1, wherein the shading coil changes in magnetic flux to cancel partially passing through the at least one stator of the stator Therefore, the starting torque can be advantageously obtained, and the excellent effect that the starting of the revolving motion can be accelerated can be achieved.
[0027]
According to a third aspect of the present invention, in the revolving actuator according to the first or second aspect , since the movable member includes a magnetic body, the magnetic body and the rotating magnetic field are included. The eccentric revolving motion is promoted by the attraction force between and the energy efficiency as an actuator can be improved.
[0028]
According to a fourth aspect of the present invention, in the revolving actuator according to any one of the first to third aspects, a movable scroll having spiral wings is coupled to the movable member, and the movable scroll A fixed scroll is combined with each other at the spiral portion, and the movable scroll is revolved around the eccentric shaft with a constant radius, thereby forming a sealed space formed by the combination of the two scrolls from the outside of the spiral portion to the center side. It is characterized in that the scroll type pump that compresses the volume of the sealed space by sequentially reducing the volume of the sealed space is compressed, so there is no need to install a transmission mechanism or a motor as a drive source under the scroll pump, and the scroll There is an excellent effect that it can contribute to thinning of the entire pump.
[Brief description of the drawings]
FIGS. 1A and 1B show a configuration of a main part of an embodiment of a revolving actuator according to the present invention, wherein FIG. 1A is a top view, and FIG. FIG.
FIG. 2 is a schematic diagram showing an outline of the driving principle of the revolution type actuator of the present invention.
FIG. 3 is a cross-sectional view schematically showing the action of the winding coil in the revolution type actuator of the present invention.
FIG. 4 is a top view showing a configuration of a main part of an embodiment different from the above of the revolution type actuator of the present invention.
FIG. 5 is a perspective view showing a configuration of a main part of a stator having a shape different from the above in the revolution type actuator of the present invention.
FIG. 6 is a top view showing a configuration of a main part of a conductor having a shape different from the above in the revolution type actuator of the present invention.
7 is a cross-sectional view when the conductor 6a and the stator 2 are cut along a cross section BB ′ in FIG. 6;
FIG. 8 is a schematic cross-sectional view showing a configuration of a main part of still another embodiment of the revolution type actuator of the present invention.
FIG. 9 is a schematic cross-sectional view showing a configuration of a main part of the embodiment when the revolution type actuator of the present invention is used as a drive source of a scroll pump.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Movable member 2 Stator 3 Coil 4 Electromagnet 5 Eccentric shaft 6 Conductor 7 Short-circuit coil (Tapping coil)
8 Narrow groove 9 Cross section 10 Defect 11 Magnetic body 12 Movable scroll 13 Fixed scroll 14 Air discharge hole 15 Oldham ring 16 Case

Claims (4)

In a revolving actuator that generates driving torque by revolving a movable member whose rotation is constrained by a rotation restraining mechanism on a predetermined revolving raceway surface,
A mover member including a conductor, and a plurality of stators that generate a rotating magnetic field with respect to the mover member;
The plurality of stators are configured such that the magnetic flux of the rotating magnetic field penetrates in a direction perpendicular to the revolution track surface of the mover member including the conductor, and the magnetic flux density of the rotating magnetic field is relatively high. Is changed with time along the revolving trajectory to generate an electromagnetic force from the eddy current generated in the conductor and the rotating magnetic field, and the movable member is eccentrically revolved around a predetermined eccentric axis. Exercise,
At least one of the stators is formed so that an area of a cross section facing the revolution raceway surface of the movable member is monotonously increased or monotonously decreased in a tangential direction of the revolution raceway. Actuator.   The revolution type actuator according to claim 1, wherein a winding coil is disposed in at least one of the stators. The mover member, according to claim 1 or claim 2 revolution type actuator according to characterized in that it comprises a magnetic material. A movable scroll having spiral wings is coupled to the mover member, the movable scroll and the fixed scroll are combined with each other at a spiral portion, and the movable scroll is revolved around the eccentric shaft with a certain radius. Thus, the scroll-type pump is configured to move the sealed space formed by the combination of the scrolls from the outside of the spiral portion to the center side and sequentially reduce the volume of the sealed space for compression. The revolution type actuator according to any one of claims 1 to 3 .

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