JP2004357466A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plurality of types of linear motor having different thrust while reducing the facility cost and enhancing productivity. <P>SOLUTION: An annular groove 23 being fitted with a core member is formed in the inner circumferential surface part 22 of an outer yoke member 12. A core member 17A having a large thickness dimension in the radial direction can be fitted in the annular groove 23 without machining the annular groove 23. Since a linear motor 10 having a different thrust can be constituted using the outer yoke member 12 commonly without adding any extra machining facility or machining process for the outer yoke member 12, versatility and thereby productivity can be enhanced. Since no extra machining facility is required for the outer yoke member 12 in order to obtain a plurality of types of linear motor 10 having different thrust, facility cost can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a linear motor.
[0002]
[Prior art]
As an example of a conventional linear motor, there is a linear motor disclosed in Patent Document 1. As shown in FIGS. 9 and 10, the linear motor 1 comprises a cylindrical stator 2 composed of two divided bodies 2a divided vertically, and the inner side of the two divided bodies 2a, The coil 4 is provided in each of the plurality of groove portions 3 formed inside the inner surface 2.
[0003]
[Patent Document 1]
JP-A-2002-227927
[Problems to be solved by the invention]
By the way, in the linear motor, general-purpose use of the linear motor is desired in order to reduce equipment costs and improve productivity. On the other hand, in the above-described linear motor 1, a portion (a portion protruding inward relative to the groove 3) between the adjacent coils 4 in the inner portion of the cylindrical stator 2 [hereinafter referred to as an iron core 5. ] Greatly affects the generation of electromagnetic force, changes the radial thickness e of the iron core portion 5 and changes the number of turns and the wire diameter of the coil 4 disposed therebetween to change the radial thickness of the coil 4. By changing the size, it is possible to adjust the thrust. By utilizing this fact, in order to meet the above-mentioned demands (reduction of equipment costs and improvement of productivity), it is possible to use the cylindrical stator 2 in common for a plurality of types of linear motors having different thrusts and to generalize the use. Conceivable.
[0005]
However, in the above-described linear motor 1, for example, when the thickness e in the radial direction of the iron core 5 is increased to obtain a large thrust, the depth f of the groove is increased as shown in FIG. There is a need. For this reason, processing of the cylindrical stator 2 is required, many processing equipment and processing steps are required, and the above-mentioned demand (reduction of equipment cost and improvement of productivity) cannot be appropriately met. is there.
[0006]
Further, by providing the iron core portion 5 with the wide portion 6 facing the inner peripheral surface 4a of the coil 4 as shown in FIG. 12, the generated force varies (corresponding to the so-called cogging torque in a rotary motor). (Fluctuation) can be reduced, and the magnetic flux of the coil 4 (armature) can be applied to the iron core portion 5 without waste to increase the thrust. However, in practice, the opening 7 of the groove 3 becomes narrower with respect to the coil 4 and it is difficult to insert the coil 4 into the groove 3 and assemble it. I couldn't do that, which was inconvenient.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a linear motor that can manufacture a plurality of models having different thrusts while reducing equipment costs and improving productivity.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a first elongated member having a hollow portion extending in the axial direction, a second elongated member capable of entering and exiting the first elongated member, and a first elongated member. A plurality of coils provided in one of an inner peripheral surface portion and an outer peripheral surface portion of the second elongate member in the axial direction; an inner peripheral surface portion of the first elongate member and an outer peripheral surface of the second elongate member A linear motor comprising: a plurality of magnets arranged in the other side in the axial direction; and an iron core provided between adjacent coils of the plurality of coils. Grooves for fixing the iron core are formed at predetermined intervals in the axial direction on the peripheral surface of the longitudinal member on which the coil and the iron core are provided.
[0009]
According to a second aspect of the present invention, in the linear motor according to the first aspect, the coil and the iron core are provided on the first elongated member.
According to a third aspect of the present invention, in the linear motor according to the first aspect, the coil and the iron core are provided on the second elongated member.
[0010]
According to a fourth aspect of the present invention, in the linear motor according to the second aspect, the first longitudinal member is divided into at least two in a longitudinal direction.
According to a fifth aspect of the present invention, in the linear motor according to the fourth aspect, an outer member that integrates each divided body is fitted to an outer periphery of the divided body of the first elongated member. .
According to a sixth aspect of the present invention, in the linear motor according to any one of the first to fifth aspects, the iron core has a base end fitted into the groove, and a protruding part connected to the base end adjacent to the groove. And a wide portion extending from the leading end of the core body so as to face the peripheral surface of the adjacent coil.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
A linear motor according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2, a linear motor 10 is used for various devices including a vibration suppressing device for automobiles, railway vehicles, structures and buildings, and has a substantially cylindrical shape having a hollow portion 11 extending in the axial direction. And an outer yoke member 12 (first longitudinal member) made of a magnetic material, and a cylindrical center yoke 13 (second longitudinal member) made of a magnetic material that can enter and exit the outer yoke member 12. ing.
[0012]
As shown in FIGS. 1 to 3, the outer yoke member 12 is vertically divided into two parts (they are respectively referred to as first and second outer yoke members 14 and 15). The two outer yoke members 14 and 15 are assembled to form the substantially cylindrical outer yoke member 12 described above. In a state where the first and second outer yoke members 14 and 15 are assembled, a thin-walled cylindrical outer member 16 that integrally connects the first and second outer yoke members 14 and 15 is fitted. The outer shell member 16 is made of a material (magnetic material) equivalent to the outer yoke member 12, and forms a part of a magnetic circuit together with the outer yoke member 12 and an iron core member 17 described later. As shown in FIG. 5, both ends of the outer yoke member 12 are fixed by a ring 18 and a bolt 19, and the outer yoke member 12 and the outer member 16 are securely connected in the axial direction.
[0013]
A plurality of semicircular grooves 21 are formed in the concave portions 20 of the first and second outer yoke members 14 and 15 at predetermined intervals in the axial direction, and thus the first and second outer yoke members 14 are formed. , 15 are formed in the inner peripheral surface portion 22 of the outer yoke member 12 with a plurality of annular grooves 23 (groove portions) formed at predetermined intervals in the axial direction. The annular portion left on the inner peripheral surface portion 22 of the outer yoke member 12 by the formation of the annular groove 23 and protruding inward relative to the annular groove 23 is hereinafter referred to as an inner peripheral reference surface portion 24 for convenience. That. The plurality of annular grooves 23 of the outer yoke member 12 are fitted with the iron core members 17 (iron cores) having an annular thickness and a predetermined thickness in a radial direction. The coils 25 are respectively disposed on the plurality of inner peripheral reference surface portions 24 of the outer yoke member 12, and the iron core members 17 are provided between the adjacent coils 25.
[0014]
On the other hand, a plurality of magnets 30 are provided on the outer peripheral surface portion 26 of the center yoke 13 in the axial direction, as shown in FIGS. The inner circumference of the plurality of magnets 30 is magnetized such that N poles and S poles are alternately arranged in the axial direction. The plurality of magnets 30 and the plurality of coils 25 are arranged opposite to each other with a gap therebetween, and generate an electromagnetic force by energizing the coil 25, thereby causing the plurality of magnets 30 and the plurality of coils 25 to be mutually and, furthermore, the center yoke 13 In addition, the relative movement of the outer yoke member 12 in the axial direction can be performed. In this case, the relative movement between the center yoke 13 and the outer yoke member 12 is performed via a guide member (not shown).
[0015]
The above-described linear motor 10 is assembled as follows. That is, the coil 25 is disposed on the concave surface portion 20 (the inner peripheral reference surface portion 24) of the first outer yoke member 12 (step S1), and then the plurality of iron cores are inserted into the semicircular groove 21 of the first outer yoke member 12. The member 17 is fitted (Step S2). The steps S1 and S2 may be performed in the reverse procedure (the coil 25 is arranged after the core member 17 is fitted). Further, the iron core member 17 and the coil 25 may be alternately mounted one by one.
[0016]
Subsequently, the second outer yoke member 12 is assembled to the first outer yoke member 12 on which the plurality of core members 17 and the plurality of coils 25 are mounted (Step S3), and the plurality of core members 17 and the plurality of coils 25 are stored. A substantially cylindrical outer yoke member 12 is obtained (step S4). The outer yoke member 12 is fitted with the outer yoke member 12 (step S5), and the outer yoke member 12 and the outer yoke member 16 are connected using the ring 18 and the bolt 19 (step S6). Next, the center yoke 13 to which the magnet 30 is mounted is housed in the outer yoke member 12 (the coil 25 and the iron core member 17), and the linear motor 10 is configured (Step S7).
[0017]
In the linear motor 10 configured as described above, as shown in FIG. 6, even when the iron core member 17A having a large radial thickness e is used to increase the thrust, the annular groove 23 is processed. Without mounting the core member 17A in the annular groove 23, the size corresponding to this (in this case, the radial thickness g is smaller than the thickness e by the depth h of the annular groove 23). Can be dealt with by using the coil 25). In other words, it is possible to configure the linear motors 10 having different thrusts by using the outer yoke member 12 in common without adding new processing equipment and processing steps to the outer yoke member 12, and accordingly, the versatility and, consequently, the versatility Productivity can be improved. Further, as described above, in order to obtain a plurality of types of linear motors 10 having different thrusts, new processing equipment for the outer yoke member 12 is not required, so that equipment costs can be reduced.
[0018]
Further, in the linear motor 10 according to the first embodiment, the axially generated force of the linear motor 10 can be received by the plurality of annular grooves 23. For this reason, the generated force in the axial direction of the linear motor 10 can be dispersed throughout the outer yoke member 12 in the axial direction, and the stress and load on the transmission portion of the generated force can be reduced.
[0019]
Further, as described above, since the outer yoke member 12 including the first and second outer yoke members 14 and 15 is cylindrically connected and fixed by the outer shell member 16, the strength of the outer yoke member 12 is improved. Even when an external force such as bending or twisting acts on the linear motor 10, the linear motor 10 can reliably and easily exhibit predetermined performance. Further, since the outer yoke member 12 is covered by the cylindrical outer member 16, the linear motor 10 has no gaps and grooves in its outer peripheral portion, and accordingly, the environmental resistance can be improved accordingly.
[0020]
Further, since the outer yoke member 12 is divided into the first and second outer yoke members 14 and 15, the coil 25 and the iron core member 17 can be easily assembled and fixed, and the reliability is improved. Can be. Further, since the outer shell member 16 is made of a magnetic material and forms a part of the magnetic circuit together with the outer yoke member 12 and the like, the thickness of the outer yoke member 12 can be reduced accordingly.
[0021]
In the first embodiment, the case where the outer yoke member 12 is divided into two in the axial direction of the cylinder (division angle 180 °) is described as an example. The angle may be an arbitrary angle such as 120 °), 4 divisions (90 ° division angle), and the number of divisions.
[0022]
Next, a linear motor according to a second embodiment of the present invention will be described with reference to FIG. In addition, about the member equivalent to the member shown in FIGS. 1-6, the same code | symbol is used and the description is abbreviate | omitted suitably.
[0023]
The linear motor 10A of this embodiment is different from the linear motor 10 of the first embodiment (FIGS. 1 to 6) in that, instead of the iron core member 17 (FIGS. 1, 4, and 6), FIG. The main difference is that the iron core member 17A shown in FIG. The iron core member 17A of FIG. 7 is formed so that the iron core main body 31 disposed between the adjacent coils 25 and the inner peripheral surface portion 25a (peripheral surface portion) of the adjacent coil 25 on the distal end side of the iron core main body 31 are formed. And a wide portion 32 to be formed. The core body 31 includes a base end 34 fitted into the annular groove 23, and a projection 35 connected to the base end 34 and disposed between the adjacent coils 25.
[0024]
The above-described linear motor 10A is assembled as follows. That is, the plurality of coils 25 are arranged on the concave surface portion 20 of the first outer yoke member 12 (Step S1A), and thereafter, the plurality of iron core members 17A are fitted into the semicircular grooves 21 of the first outer yoke member 12 (Step S1A). Step S2A). Hereinafter, similarly to the first embodiment, the assembling steps of steps S4 to S7 are performed to obtain the linear motor 10A.
[0025]
Instead of step S1A and step S2A, a plurality of coils 25 and a plurality of iron core members 17A are previously assembled in the axial direction (step S1B), and thereafter, a plurality of coils 25 and a plurality of iron core members 17A assembled in step S1B are provided. May be fixed and positioned on the first outer yoke member 12 (step S2B). Further, two coils 25 are arranged on the concave surface portion 20 of the first outer yoke member 12, and one coil 25 is provided between the two coils 25 in the semicircular groove 21 of the first outer yoke member 12. The core member 17A is fitted (step S1C), and the coil 25 and the core member 17A are alternately mounted on the first outer yoke member 12 with one coil 25 preceding (step S2C). It may be.
[0026]
In the linear motor 10A configured as described above, since the iron core member 17A has the wide portion 32 formed so as to face the inner peripheral surface portion 25a of the adjacent coil 25, the generated force varies (so-called, It is possible to easily reduce the fluctuation corresponding to the cogging torque in the rotary motor, or increase the thrust by applying the magnetic flux of the coil 25 (armature) to the iron core member 17A without waste. In this linear motor 10A, since the iron core member 17A is assembled to the outer yoke member 12, although the wide portion 32 is provided, the mounting of the coil 25 can be realized easily and reliably. Performance can be reliably achieved.
[0027]
In the above-described first embodiment, the linear motor 10 in which the outer yoke member 12 including the first and second outer yoke members 14 and 15 is fixed by the outer shell member 16 has been described as an example. As shown in the figure, a linear motor 10 </ b> B performed by the fixed band 40, the bolt 41, and the nut 42 may be configured (third embodiment). As shown in FIG. 8, the fixed band 40 includes a band main body 43 wound around the outer yoke member 12 and flange portions 44 connected to both ends of the band main body 43. When the flange portion 44 is fastened by the bolt 41 and the nut 42, the fixing band 40 is reduced in diameter, so that the outer yoke member 12 including the first and second outer yoke members 14 and 15 is tightened, and furthermore, the fixing thereof is performed. I'm trying to do it. In the third embodiment, three fixed bands 40 are used. The number of the fixed bands 40 may be four or more, or two or one.
[0028]
In each of the above embodiments, the case where the coil 25 and the iron core member 17 (17A) are provided on the inner peripheral surface portion 22 of the outer yoke member 12 and the magnet 30 is mounted on the outer peripheral surface portion 26 of the center yoke 13 has been described. Alternatively, the coil and the iron core member may be provided on the outer peripheral surface 26 of the center yoke 13, and the magnet may be provided on the inner peripheral surface 22 of the outer yoke member 12. In this case, an annular groove (not shown) for fitting an iron core member is formed in the outer peripheral surface portion 26 of the center yoke 13 instead of the inner peripheral surface portion 22 of the outer yoke member 12, while the iron core member is of a split type. . The split-type iron core member is configured such that, for example, a plurality of arc-shaped iron cores are combined by assembly to form an annular shape. In this case, it is configured such that adjacent arc-shaped iron cores are securely joined so as not to be separated.
In each of the above embodiments, the outer yoke as the first elongate member has a cylindrical shape. However, the present invention is not limited to this, and the first yoke may have a polygonal first shape such as a hollow square shape. May be used.
[0029]
【The invention's effect】
According to the invention described in any one of the first to third aspects, a predetermined interval in the axial direction is provided on a peripheral surface portion of the first and second elongated members on which the coil and the iron core are provided. Thus, since the groove for fixing the iron core is formed, it is possible to fit iron core members having different radial thicknesses into the groove without changing the depth of the groove. For this reason, it is possible to configure a plurality of types of linear motors having different thrusts by commonly using the longitudinal members provided with the coil and the iron core, thereby improving versatility and productivity.
[0030]
According to the fourth aspect of the present invention, since the first elongated member is divided into at least two in the longitudinal direction, the coil and the iron core can be easily assembled.
According to the invention as set forth in claim 5, since the outer member that integrates each divided body is fitted to the outer periphery of the divided body of the first elongated member, the joining strength of the first elongated member is reduced. The first elongated member can be maintained in a cylindrical shape even when subjected to an external force such as bending or twisting, and good performance can be secured.
[0031]
According to the invention as set forth in claim 6, the iron core has a base end fitted into the groove, and a protrusion connected to the base end is arranged between adjacent coils; A wide portion formed on the front end side so as to face the peripheral surface portion of the adjacent coil, so that a variation in generated force (a variation corresponding to a cogging torque in a rotary motor) can be reduced, It is possible to easily increase the thrust by making the magnetic flux of the iron core work without waste. Furthermore, since the core member is mounted on the outer yoke member and assembled, although the wide portion is provided, the coil can be easily and reliably mounted, and the performance improvement using the wide portion can be reliably achieved. .
[Brief description of the drawings]
FIG. 1 is a sectional view showing a linear motor according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a perspective view showing a first outer yoke member of FIG. 1;
FIG. 4 is a cross-sectional view showing a state in which a coil and an iron core member are mounted on a first outer yoke member of FIG. 3;
FIG. 5 is a sectional view showing an end side of the first outer yoke member of FIG. 1;
6 is a cross-sectional view showing a state where an iron core member having a radial thickness different from that of the iron core member of FIG. 1 is mounted on the first outer yoke member of FIG. 1;
FIG. 7 is a sectional view showing a linear motor (second embodiment) using an iron core member having a wide portion.
FIG. 8 is a front view showing a linear motor (third embodiment) using a fixed band.
FIG. 9 is a perspective view showing one divided body of a divided type cylindrical stator used for an example of a conventional linear motor.
FIG. 10 is a cross-sectional view showing an example of a conventional linear motor using one divided body of the cylindrical stator of FIG.
11 is a cross-sectional view for explaining a problem when an iron core having a large radial thickness is used for the cylindrical stator of FIG. 9;
FIG. 12 is a cross-sectional view for describing a problem that occurs when a wide portion is provided in an iron core portion of the cylindrical stator in FIG. 9;
[Explanation of symbols]
10 Linear motor 12 Outer yoke member (first longitudinal member)
13 center yoke (second longitudinal member)
16 Outer shell 17, 17A Iron core (iron core)
23 annular groove (groove)
25 coil 32 wide section

Claims (6)

A first elongate member having a hollow portion extending in the axial direction, a second elongate member capable of entering and exiting the first elongate member, an inner peripheral surface portion of the first elongate member, and the second elongate member. A plurality of coils provided in one of the outer peripheral surface portions of the longitudinal member in the axial direction, and a plurality of coils arranged in the axial direction on the other of the inner peripheral surface portion of the first longitudinal member and the outer peripheral surface portion of the second longitudinal member. In a linear motor including a plurality of magnets provided and an iron core provided between adjacent coils of the plurality of coils,
A groove for fixing the iron core is formed at predetermined intervals in the axial direction on a peripheral surface portion of the first and second elongated members on which the coil and the iron core are provided. Features a linear motor. The linear motor according to claim 1, wherein the coil and the iron core are provided on the first elongated member. The linear motor according to claim 1, wherein the coil and the iron core are provided on the second elongated member. 3. The linear motor according to claim 2, wherein the first elongated member is divided into at least two in a vertical direction. 5. The linear motor according to claim 4, wherein an outer member integrating each divided body is fitted to an outer periphery of the divided body of the first elongated member. 6. The linear motor according to claim 1, wherein a base end of the core is fitted into the groove, and a protrusion connected to the base end is arranged between adjacent coils. A linear motor, comprising: a main body; and a wide portion extending from a distal end side of the iron core main body so as to face a peripheral surface of the adjacent coil.

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