JPH1014210A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bind a group of primary cores which constitute a linear motor, without welding, when stacking core plates and binding them. SOLUTION: A band 18 is given tension by removing teeth at contain intervals in longitudinal direction of a group of cores, arranging a reinforcing core in the removal section, setting a group of cores 5 on the spigot made at the auxiliary core, and hooking the projections 19b of auxiliary plates 19 in the slots 18b at both ends of the band 18. The band 18 produces binding force, with small flexural rigidity, and the auxiliary plate 19 is coupled with the auxiliary core through a stod bolt 21 piercing this.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor, in which a core group is bound without welding.

[0002]

2. Description of the Related Art A linear motor has a configuration in which a squirrel-cage motor is developed, and its structure is shown in FIG. The linear motor is largely divided into a primary core 1 and a secondary conductor 2, and has a long secondary structure in which the secondary side is longer than the primary side. And the secondary side is the stator, the primary side is the runner,
An air gap 3 is formed between them.

The primary side core 1 is configured as follows. As shown in FIGS. 6A and 6B, a plurality of slits 8 are formed in a thin plate.
Is formed to form the comb-shaped core plate 4 provided with the teeth 13. The core plate 4 is formed of a magnetic material. The core plates 4 are laminated as shown in FIGS. 7A and 7B and are integrally welded together with the side plates 14 and the back plate 15 to form a core group 5 with the slit 8 being on the inside. Are arranged radially at equal intervals along a circle, are sandwiched between a pair of ring-shaped flanges 6, and are tightened and connected with a plurality of through bolts 7 and nuts (not shown) to form the primary side core 1. . A wheel 12 is rotatably provided in the flange 6.
Is provided. A coil 9 surrounding the secondary conductor 2 is accommodated in each slit 8.

On the other hand, the secondary-side conductor 2 is formed by covering the outer peripheral surface of a round rod-shaped magnetic conductor 10 with a non-magnetic conductor 11 having interference. Here, the magnetic conductor 10 is formed of iron, and the nonmagnetic conductor 11 is formed of aluminum, copper, or the like.

[0005] However, since the laminated core plate 4, side plate 14, and back plate 15 are welded, the core group 5 is bent or twisted, and the air gap 3 varies after assembly. Further, when the nuts are tightened because the parallelism of both end faces of the core group 5 is reduced, play occurs in the shorter one of the core groups 5. For this reason, the following measures have been taken.

(A) Strain relief annealing of the core group 5 is performed to correct bending and torsion.

(B) The back plate 15 and the side plate 14 are thickened to increase the strength and suppress distortion due to welding to a practically acceptable level.

(C) The core group 5 is machined after welding.
Correct the circular curved shape, parallelism of both end faces, and overall length to the required accuracy.

[0009]

However, correcting the welding and the distortion after the welding as described above has the following problems.

(A) Since not only welding but also annealing and machining must be performed, the number of manufacturing steps increases.

(B) When the thickness of the back plate or the side plate is increased,
Not only does the material cost increase, but the dimensions of the linear motor become larger and heavier.

(C) It is unavoidable that distortion occurs when welding is performed, and there is a limit in distortion correction, so that it is difficult to manufacture a thin and long linear motor.

On the other hand, in order to solve the conventional problems, a configuration as shown in FIGS. As shown in the figure, the teeth 13 at both ends of the core group 5 and two places between them are
Four pieces are removed in the circumferential direction.
A reinforcing core 17 shown in (a) and (b) is provided. At four places on the outer peripheral surface of the reinforcing core 17, the teeth 13 in the core group 5 are provided.
A spigot 17a is provided for fitting an outer part except for the spigot 17 and an arcuate surface 17b is formed on the bottom surface of the spigot 17a. The depth H of the spigot 17 a is substantially equal to the height of the core group 5 excluding the teeth 13.

Then, as shown in FIG. 9B, a band 18 shown in FIG. 13 is used to press the core group 5 fitted into the spigot 17a against the arc surface 17b of the reinforcing core 17. The bands 18 are formed of a material having a small bending rigidity and a small thickness, and mounting holes 18a are formed at both ends. The band 18 may be directly connected to the reinforcing core 17, but since the reinforcing core 17 is thin and it is difficult to form a screw hole in the immediate vicinity of the spigot 17a, the auxiliary plate 19 may be used.
To be combined. Insert holes 17c and 19a are formed in the reinforcing core 17 and the auxiliary plate 19 shown in FIGS. 10 and 11, respectively, and the screw holes 21a at both ends of the through bolt 21 (see FIG. 12) inserted into these insert holes 17c and 19a are formed. By screwing the bolt 28 as shown in FIG.
One end of each of the first flanges 6 is connected to a pair of flanges 6. FIG.
As can be seen from FIG. 9, the auxiliary plate 19 is slightly thicker than the reinforcing core 17, and is disposed between the core groups 5 in the circumferential direction.
In the axial direction, the reinforcing core 17 is located between the coils 9.
Is arranged next to the position where is arranged. And FIG.
As shown in (a), a band 18 covering the back surface of the core group 5 is formed.
Are connected to the auxiliary plate 19 via bolts 22.

In addition, as shown in FIG. 8, a wide clip 16 having a U-shaped cross section is formed between the bands 18.
Is provided. This is provided only for the purpose of binding the core plates 4 as shown in FIG. 9B. This is to strengthen the binding between the core plates 4 by the spigot 17a and the band 18.

Here, the core group 5, the auxiliary plate 19, and the band 1
8 is much larger than the amount of elastic deformation generated by tightening the bolt 22, the tightening allowance in consideration of the processing dimension error is required for reliable tightening, and FIG. As shown in ()), the band 18 is shortened to secure the interference G. And bolt 22
When the tightening of the bolts 22 is completed, as shown in FIG.
Is in a floating state.

However, most of the tension applied to the band 18 is received by the X and Y portions in FIG.
The portions may have large stresses due to the small contact area, and the band 18 may become loose later because the tension cannot be maintained for a long period of time. Further, the bolt 22 is in a state where the power relationship is unstable, and there is a possibility that the bolt 22 may be loosened or broken.

Therefore, an object of the present invention is to provide a linear motor that solves the above problem.

[0019]

In order to achieve the above object, a structure of the present invention is to form a core by laminating a plurality of comb-shaped core plates by forming teeth by forming a plurality of slits in a thin plate. A primary core is constructed by arranging a plurality of core groups radially so that the slits face each other on the inside and connecting them to each other to form a primary core. In the linear motor in which the secondary conductor of the above is movably inserted through the air gap into the space surrounded by the core group in the primary core, the teeth at the corresponding positions in the length direction of each core group are A substantially ring-shaped reinforcing core is disposed on the removed portion, and an inlay for fitting a part of the core group other than the teeth is formed in the reinforcing core, and a part of the core group is fitted into the inlay. ,Reinforcement A, while forming projections on both sides of the spigot, cover the back surface of the core group and form hook holes for hooking the projections on both ends of the band with no binding power and low bending rigidity. In the center of the band, insert holes are formed near the center, and with the respective protrusions fitted into the respective hook holes, tension is applied to the band by bolts that are inserted into the respective insert holes and screwed to the reinforcing core. It is characterized by having been given.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In this embodiment, since a part of the linear motor shown in FIGS. 8 and 9 is improved,
The same portions are denoted by the same reference numerals and description thereof will be omitted, and only different portions will be described.

The main part of the linear motor according to the present invention is shown in FIG.
Shown in In the present invention, the protrusions are formed on both sides of the spigot in the reinforcing core. In this embodiment, as shown in FIGS. 2 and 4, the protrusions are formed adjacent to the tap holes 19c near both ends of the auxiliary plate 19 instead of the reinforcing core. 19b are respectively formed. This is because, as shown in FIG. 9, the band 18 is connected to the auxiliary plate 19, and the auxiliary plate 19 is connected to the reinforcing core 17 via the bolt 21. On the other hand, as shown in FIG. 3, in order to fit the projections 19b at both ends of the band 18, and to reduce the tensile strength as compared with the other parts of the band 18, but to prevent deformation under the required tensile force. A long hole 18b is formed as a hook hole. Then, in order to apply tension to the band 18 with the elongated hole 18b hooked on the protruding portion 19b, a T-shaped insertion hole 18c connected to the elongated hole 18b is formed in the band 18. Then, after inserting a bolt 22 large enough to generate the necessary tension in the band 18 with a tightening torque smaller than the specified tightening torque into the insertion hole 18c, the tap hole 1 of the auxiliary plate 19 is inserted.
The band 18 holds the core group 5 by screwing and tightening the core group 9c.

The attachment of the band 18 is performed as follows. As shown in FIG. 1, the band 1 is
After hooking the long holes 18b at both ends of the bolt 8, the bolt 22 inserted into the insertion hole 18c is inserted into the tapped hole 1 of the auxiliary plate 19.
9c. FIG. 1 shows a state before the bolt 22 is tightened.
When a tension is applied to the band 8 and the tension exceeds a certain value, the vicinity of the elongated holes 18b located at both ends of the band 18 is deformed into an arc shape, and the state shown in FIG. Since the tightening torque at this time is still smaller than the specified value, the bolt 22
Is further tightened to complete the mounting of the band 18. A force for sandwiching the core group 5 is generated in the band 18 sandwiched between the head of the bolt 22 and the auxiliary plate 19, and the core group 5 is pressed against the arc surface 17 b of the reinforcing core 17 with a large force, and the reinforcement is performed. The bonding strength between the core 17 and the core group 5 is large.

In this embodiment, both ends of the band are connected to the reinforcing core via the auxiliary plate. However, both ends of the band may be directly connected to the reinforcing core without using the auxiliary plate.

[0024]

As can be understood from the above description, according to the linear motor according to the present invention, a certain tension is generated by tightening the bolt with the protruding portion inserted into the hooking hole, and the vicinity of the hooking hole of the band is generated. And the gap between the head of the bolt and the reinforcing core is eliminated, and the band is strongly sandwiched between the head of the bolt and the reinforcing core by further tightening the bolt. For this reason, the tension of the predetermined band is reliably held. In addition, since the frictional force generated between the head of the bolt and the reinforcing core and the band acts as a force for holding the tension,
There is no risk of the band becoming loose.

[Brief description of the drawings]

FIG. 1A is a plan view and FIG. 1B is a front view of a main part of a linear motor according to the present invention before bolting.

FIG. 2A is a plan view and FIG. 2B is a front view of a main part of the linear motor according to the present invention after bolting.

3A is a plan view and FIG. 3B is a front view of the band.

4A is a plan view and FIG. 4B is a front view of the auxiliary plate.

5A is a front view of a conventional linear motor, FIG.
(B) is a CC view of (a).

6A is a left side view and FIG. 6B is a front view of the core plate.

7A is a left side view and FIG. 7B is a front view of the core group.

FIG. 8 is a front view showing an improvement plan of the linear motor.

9 (a) is a view as viewed in the direction of arrows AA in FIG. 8, and FIG. 9 (b) is a view as viewed in the direction of arrows BB in FIG.

10A is a front view and FIG. 10B is a right side view of the reinforcing core.

11A is a plan view and FIG. 11B is a front view of the auxiliary plate.

FIG. 12 is a front view of a through bolt.

13A is a plan view and FIG. 13B is a front view of the band.

14A is a plan view and FIG. 14B is a front view of a main part of a linear motor according to an improvement before bolt tightening.

FIG. 15 is a front view showing a main part of the linear motor according to the improved plan after bolt tightening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Primary side core 2 ... Secondary side conductor 3 ... Air gap 4 ... Core plate 5 ... Core group 8 ... Slit 9 ... Coil 13 ... Teeth 17 ... Reinforcement core 17a ... Inlay 18 ... Band 18b ... Long hole 18c ... Insertion hole 19 ... Auxiliary plate 19b ... Protrusion 22 ... Bolt

Claims (1)

[Claims] A core group is formed by laminating a plurality of comb-shaped core plates provided with teeth by forming a plurality of slits in a thin plate, and forming the core group such that the slits face each other inside. A primary core is constructed by arranging a plurality of radial cores and connecting them to each other.A coil is placed in the slit of the primary core, and a long secondary conductor is placed in the space surrounded by the core group in the primary core. In a linear motor movably inserted through an air gap, a tooth at a corresponding position in a length direction of each core group is removed, and a substantially ring-shaped reinforcing core is arranged at the removed portion. A reinforcing core is formed with a spigot for fitting a part of a part other than the teeth of the group, and a part of the core group is fitted into the spigot, and a protrusion is formed on both sides of the spigot in the reinforcing core. The insertion hole was formed respectively on the inboard band against hooking holes each with both ends of the band of lower and flexural rigidity without Cohesion form a hook hole hooking the protruding portion covers the back of,
A linear motor, wherein tension is applied to a band by bolts which are inserted into respective insertion holes and screwed to a reinforcing core in a state where respective projections are fitted in respective hook holes.