JP2751684B2 - Linear motor stator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a linear motor used for efficiently transporting a work or the like in an industrial processing line or the like, and more particularly to a permanent magnet disposed on the stator. The present invention relates to a linear motor stator that can be easily and accurately mounted.

[0002]

2. Description of the Related Art A conventional linear motor has, for example, a structure as shown in FIGS. In FIG. 6, reference numeral 5 denotes a mover mounted on a not-shown structure movably constituted by wheels or the like, and a large number of ferromagnetic plates provided with slots are laminated to form a predetermined number of magnetic poles. It comprises a mover core 6 to be constructed and a plurality of windings 7 fitted into slots formed in the magnetic poles. 10
A stator core 12 is formed by laminating many ferromagnetic plates in the same manner as the above-mentioned mover, and N is provided on the surface of the stator core so as to face the magnetic pole of the mover. And a plurality of permanent magnets 3 in which poles and S poles are alternately arranged and fixed. FIG. 7 is a perspective view of the stator 10. In FIG. 7, reference numeral 12 denotes a stator core, 3N denotes a permanent magnet arranged with the N pole facing the surface, and 3S denotes a permanent magnet arranged with the S pole facing the surface. This arrangement is repeated for a predetermined section.
It is mounted and fixed on the core continuously by bonding or the like.
The linear motor constructed as described above has a moving magnetic field obtained on the mover core 6 and a permanent magnet of the stator by applying a current to the winding 7 of the mover under predetermined conditions by an electric circuit (not shown). 3 interacts with the magnetic flux,
The movable element configured to be movable is driven and moves linearly. FIG. 8 shows 3N as an example of a cross section of a single magnet used in such a linear motor.
N has a chamfer 3Na at the upper corner.

[0003]

In the linear motor stator having the above-described structure, a plurality of permanent magnets 3 (hereinafter, referred to as magnets) are precisely formed at a pitch determined by the specifications of the linear motor. Must be arranged,
For this purpose, the magnets are bonded one by one on the core using a jig. In the above-mentioned bonding operation, this magnet is strong, and it is particularly difficult in the case of, for example, a rare-earth magnet. That is, in order to bond the respective magnets, the bonded magnets must be securely fixed and then be put into the bonding operation of the adjacent magnets. Otherwise, the previously bonded magnets are attracted and sometimes these magnets are broken. There was also a fear of doing. Accordingly, in the stator manufacturing operation, there are the following problems to be solved by the present invention. 1) Positioning work is required individually when magnets are bonded. 2) Since it is necessary to confirm that the sheets are securely fixed one by one and then proceed to the next bonding, the working time becomes extremely long. 3) Positioning is difficult because magnetic fluxes of adjacent magnets interfere with each other. 4) When it is necessary to control the gap length between the mover and the stator, it is necessary to increase the accuracy of the magnet thickness, which increases the cost of the magnet. 5) Magnets are costly because the shape and dimensions of the magnets are adjusted to an appropriate accuracy in order to properly obtain the magnetic path of the stator. 6) If there is a variation in the thickness of the adhesive for bonding the magnet, the gap length will vary, and the thrust of the linear motor will vary. 7) Since the magnets are exposed on the surface and there is a gap between the magnets, it is difficult to remove the metal powder attached to the magnet surface during the operation, which is troublesome. The present invention addresses the above-described problems and provides a high quality linear motor.
It is an object of the present invention to provide a linear motor stator capable of obtaining a motor at low cost.

[0004]

In order to solve the above-mentioned problems, a stator of a linear motor according to the present invention comprises a ferromagnetic plate material formed into a predetermined shape by press working including a predetermined number of slots. A plurality of magnetic poles are formed by including a movable element core formed by laminating a large number (laminate) and windings inserted into a plurality of slots of the movable element core to flow a predetermined drive current. A movable element made movable;
A stator core formed by laminating (laminating) a large number of ferromagnetic plates formed into a predetermined shape including grooves for inserting a plurality of permanent magnets, similarly to the above-mentioned mover core;
A stator having a plurality of permanent magnets having N poles and S poles alternately arranged on a side of the stator core facing magnetic poles formed on the mover; In the above, on the side of the stator core where a plurality of permanent magnets are disposed, a window-like mounting hole for inserting and fitting each of the permanent magnets is opened, and the mounting hole and the surface of the stator core are A thin portion serving as an outer frame of the window-shaped mounting hole is left in between, and the individual permanent magnets are inserted and fixed in the mounting hole. The stator core is formed by laminating a plurality of magnetic plates formed in advance by forming a window-shaped hole.

[0005]

As described above, a linear motor according to the present invention is used.
The stator of the stator has a window-like hole for fitting the individual permanent magnets in the vicinity of the surface of a stator member formed by laminating a large number of ferromagnetic plates constituting the stator. The surface is left with a thin portion serving as an outer frame of the hole, and a permanent magnet is inserted and fixed in the hole, so that the magnetic flux formed between the adjacent N pole and S pole is Then, the magnetic path formed in the thin frame portion of the core is shunted, but the magnetic path of the thin frame portion is saturated with a slight magnetic flux, and most of the magnetic flux reaches the mover core. In addition, the mounting hole allows the permanent magnet to be placed in the correct position without a jig, and prevents the influence of adjacent magnets during mounting, so the working time can be extremely reduced, and the performance accuracy of the linear motor equipped with this stator However, low-cost production is possible.

[0006]

Next, an embodiment of a linear motor according to the present invention will be described in detail with reference to FIGS. FIG.
1 is a schematic side view illustrating a configuration of a linear motor to which a stator according to the present invention is applied. In FIG. 2, reference numeral 1 denotes a stator, and reference numeral 5 denotes a mover mounted on a moving structure (not shown) configured to be movable by an axle or the like (not shown). The stator 1 includes a stator core 2 formed by laminating a large number of ferromagnetic plates and forming a plurality of window-shaped holes 2a having a predetermined shape on the surface thereof, except for a thin portion 2b serving as an outer frame. In each hole 2a of the stator core 2, individual magnets 3S, 3
As will be described in detail later, N is composed of a permanent magnet 3 near the surface of the stator core 2 and N poles and S poles are arranged and fixed alternately so as to face the magnetic poles of the mover 5. Have been. The mover 5 includes a mover core 6 formed by laminating a large number of ferromagnetic plates formed into a predetermined shape by pressing or the like, including a slot into which a coil is inserted, similarly to the stator, and a movable core 6. And a plurality of windings (coils) fitted into slots formed in the daughter core. The linear motor constructed as described above is configured so that an electric circuit (not shown) allows a current to flow through the winding 7 under a predetermined condition, so that the moving magnetic field obtained in the mover core 6 and the magnetic flux generated by the permanent magnet 3 The movable element 5 configured to be able to move linearly is driven and moved by the interaction of.

FIG. 3 shows a side view of the stator core 2. The stator core 2 is formed by forming a ferromagnetic plate material into a predetermined shape including the mounting holes by press working, laminating the formed plate materials, and fixing them with caulking pins (not shown). I have. When the stator core 2 is assembled as a linear motor, a thin portion 2b serving as an outer frame is left on the surface of the movable member 5 facing the magnetic pole side, and a window-like mounting hole for mounting the permanent magnet 3 is provided. 2a is formed so that the left, right, upper and lower dimensions are slightly larger than the dimensions of the magnet 3, and the magnet 3 can be inserted tightly.

FIG. 1 shows a mounting hole 2 a of the stator core 2.
1 shows a stator 1 in which a permanent magnet 3 is mounted. In FIG. 1, reference numeral 2 denotes the above-described stator core, which has an adhesive adhered to the permanent magnet 3 so that N poles and S poles are alternately and continuously arranged on the thin outer frame portion 2b side.
It is inserted and fixed in the mounting hole 2a shown in FIG. In FIG. 1, 3N indicates a magnet mounted with the N pole having the thin outer frame portion 2b side, and 3S indicates a magnet mounted with the S pole having the thin outer frame portion 2b side. The magnetic flux formed between the adjacent N pole and S pole is
Although the magnetic flux is divided by the magnetic path formed in the thin outer frame portion 2b of the core 2, the magnetic path of the outer frame 2b portion is formed thin, so that it is saturated with a small amount of magnetic flux, and most of the magnetic flux is To reach. The magnetic flux formed by the magnet 3 on the mover core 6 and the current flowing through the winding 7 cause the mover core 6
The movable element 5 configured to be movable is efficiently driven by the interaction with the moving magnetic field obtained in step (1). FIG. 4 is a perspective view of the stator 1. 4, reference numeral 2 denotes a stator core, and reference numeral 3 denotes a magnet.

In the above description, the basic structure of the present invention and the means for manufacturing the same have been described as embodiments, and various other applications and modifications can be made. For example, in the above description, the ferromagnetic plate having the window-shaped hole 2a formed by press working is described as being laminated. However, the outer frame portion is formed on the appropriate ferromagnetic material plate by other means. What is necessary is just to shape 2b narrowly. Also, the magnet is fixed by bonding, but after the magnet is inserted into the hole 2a, it may be fixed by any fixing means other than bonding. Further, depending on the configuration of the linear motor, a stator according to the present invention may be provided on both outer sides of a pair of movable members provided above and below a moving structure (not shown) as shown in FIG. Can be provided. In that case, the polarities of the magnets of the upper and lower stators do not need to be aligned. In FIG. 5, 1
U is an upper stator, 1D is a lower stator, 20 is an upper movable element 5U mounted on the upper part, and a lower movable element 5D mounted on the lower part, and a traveling axle, a power supply mechanism and the like are not shown. It is a structure. The upper stator 1U includes a magnet 3N having an N pole on the lower side of the upper core 2U and a magnet 3S having an S pole on the lower side.
Are alternately arranged. In addition, the lower stator 1D includes
Magnets 3N having an upper N pole and magnets 3S having an upper S pole are alternately arranged on the lower core 2D. The stator of the present invention also has a hole 2 provided in the core for inserting and fixing a magnet.
By providing a predetermined amount of change without making the pitch of a constant, it is possible to obtain an effect equivalent to skew.

[0010]

As described above, in the stator of the linear motor according to the present invention, the permanent magnet is provided in close proximity to the surface of the stator member (core) formed by laminating the magnetic plates constituting the stator. And a permanent magnet is inserted and fixed in this hole. Therefore, the permanent magnet can be arranged in the correct position without a jig, and the influence of the adjacent magnet at the time of mounting is prevented, so that the working time is extremely reduced.
Since the stator member is formed by laminating a plurality of magnetic plates, it is easy to process the stator member. Therefore, a lower cost linear motor can be obtained. Further, a stator member with low loss can be obtained. Therefore, the present invention has the following excellent effects. 1) The manufacturing time can be reduced. 2) When mounting the permanent magnets, it is only necessary to insert each magnet into the mounting hole, so that no individual positioning work is required, and therefore no positioning jig is required. 3) Since each magnet only needs to be inserted into the mounting hole, the magnetic flux of the magnet does not interfere with each other and positioning is easy. 4) Since each magnet may be inserted individually into the mounting hole, it is not necessary to observe the order that a certain magnet is securely fixed and then proceed to mounting the next magnet. We can save. 5) Since each magnet may be inserted into the mounting hole, the magnetic fluxes of adjacent magnets do not interfere with each other and are attracted to each other, or the adjacent magnets collide with each other and are damaged, thereby improving the yield of the used magnets. I do. 6) By providing a margin for the size of the opening with respect to the size of the magnet, the dimensional accuracy of the magnet can be reduced as compared with the related art, and the cost of the magnet can be reduced. 7) Even if the amount of adhesive for bonding the magnets varies,
Since there is no change in the gap length between the cores of the mover and the stator, there is no possibility that the cores come into contact with each other, the gap can be reduced as much as possible, and the efficiency of the linear motor can be improved. 8) Even if a foreign object is caught between the mover and the stator, there is no danger of damaging the magnet, so that the reliability of the linear motor can be improved. 9) Since the surface of the mover is made flat without irregularities, it is easy to clean the mover during the working process and after manufacturing. 10) Since the surface of the mover is made flat, it becomes possible to mount a wiper or the like for preventing foreign matter from entering between the mover and the stator. 11) A uniform linear motor with good performance and quality can be obtained. 12) The production cost of the linear motor can be reduced as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a side view for explaining an embodiment of a stator of a linear motor according to the present invention.

FIG. 2 is a schematic side view of a linear motor to which a stator according to the present invention is applied.

FIG. 3 is a side view of a stator core constituting the stator shown in FIG. 2;

FIG. 4 is a perspective view of a stator of the linear motor shown in FIG. 2;

FIG. 5 is a schematic side view in which a stator according to the present invention is applied to a double-sided linear motor.

FIG. 6 is a schematic side view showing an example of a linear motor to which a conventional stator is applied.

FIG. 7 is a perspective view showing a stator of a conventional linear motor.

FIG. 8 is a sectional view of a conventional permanent magnet of a linear motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 2a Magnet mounting hole 2b Thin outer frame part 3 Magnet 3N N pole magnet 3S S pole magnet 5 Mover 6 Mover core 7 Winding

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 41/03 H02K 41/02 H02K 41/035

Claims (2)

(57) [Claims] A movable core formed by laminating ferromagnetic plates formed in a predetermined shape including a plurality of slots disposed at predetermined intervals, and a winding fitted in each of the slots. A movable member, a stator core formed by laminating a ferromagnetic plate formed in a predetermined shape facing the movable member, and a magnetic pole formed by the movable member of the stator core. Each of the N pole and S
A stator having a plurality of permanent magnets whose poles are alternately arranged toward the magnetic poles of the mover; and a stator having a plurality of permanent magnets. In the vicinity of the surface on which the magnet is provided, there are provided a plurality of window-shaped mounting holes that are opened except for a thin portion to be an outer frame, and the permanent magnet is inserted and fixed in the mounting holes. A stator for a linear motor. 2. A two-sided linear motor stator, wherein one movable element is provided on each of the upper and lower sides of the moving structure, and stators are respectively provided on both outer sides of each movable element. A stator for a linear motor, at least one of which has the structure according to claim 1.