JPH0746819A - Primary-side unit of linear motor - Google Patents

Abstract

PURPOSE:To obtain a primary-side unit wherein production costs are reduced, the assembly accuracy of cores is enhanced, the accuracy of a core gap with reference to a secondary-side unit is enhanced, the air gap is reduced, the efficiency of a motor is enhanced and the pitch of the mounting position of the motor can be made constant within a certain range even when a core stack size is changed according to a drive force required from the motor. CONSTITUTION:Cores, provided with lugs, which are obtained by stamping thin plates to be shapes in which both ends at lower edge parts of rectangular thin plates are provided with lugs are laminated 11, fixed and bonded. Mounting metal fittings 12 when have been stamped are fixed and bonded respectively to both side faces of lug parts 11A of the laminated cores provided with the lugs or both side faces of the lug parts 11A are sandwiched and held by the mounting metal fittings 12 which have been stamped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a primary side unit of a linear motor.

[0002]

2. Description of the Related Art FIG. 2 shows a primary side unit of a conventional linear motor. (A) is a plan view, (B) is a front view of (A), and (C) is (B). 3 is a side view, FIG.
FIG. 4 is a sectional side view of a primary side unit of the conventional linear motor shown in FIG. 2. As shown in FIG. 2, in the primary unit of a conventional linear motor, a core obtained by punching a thin plate into a rectangular shape is laminated on a laminated core 1 having a thickness L using a jig, and this is machined. It is sandwiched between individual tightening materials 2 and tightened with bolts 3 and nuts 4, and inserted into bolt holes of a mounting pitch P provided on the first and second mounting feet 5A and 5B at both end extensions of the tightening material 2. It was mounted on the track rail with a bolt (not shown).

[0003]

However, the primary unit of the conventional linear motor shown in FIG. 2 has the following drawbacks. As shown in FIG. 3, gaps G ₁ , G ₂ , G between the bolt 3 and the laminated core 1 and between the bolt 3 and the two fastening members 2 are formed.
_{Since 3} occurs and there is a variation in the gap, 2 tightening materials 2
The assembling accuracy between them is unstable, and the assembling accuracy between the fastening material 2 and the core 1 is unstable. The linear motor is required to have a stable height accurately, but the height becomes uneven. The mounting pitch P of the motor changes when the stacking dimension L of the core is changed according to the thrust required for the linear motor, but if the mounting pitch P is to be made constant, a mounting foot with a complicated shape is provided. Or, there were cases where the mounting feet were unnecessarily large.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has ears provided at both ends of the lower edge of a rectangular thin plate so as to eliminate the need for using a conventional fastening material. Laminate and secure the cores with ears that are punched out of thin plates in shape, and attach the press fittings to both sides of the ears of the laminated ears cores, or from both sides of the ears. It is intended to provide a primary side unit of a linear motor that is sandwiched by press-fitted mounting brackets.

[0005]

Function: Ear cores obtained by punching out thin plates in a shape in which ears are attached to both ends of a rectangular thin plate are laminated and fixed, and the laminated cores with ears are pressed on both side surfaces of the ears, respectively. Since the processed mounting bracket is fixed, or the ears are clamped from both sides by the pressed mounting bracket,
The conventional tightening material for tightening the laminated core is no longer required, and the conventional gaps between the bolt and the laminated core and between the bolt and the tightening material are eliminated. The pitch can be kept constant, and the height h of the primary side unit can be made stable with accuracy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a primary side unit of a linear motor according to the present invention will be described below with reference to FIG. Figure 1
[FIG. 3] shows a primary side unit of a linear motor according to the present invention, (A) is a plan view, (B) is a front view of (A), and (C) is a side view of (B). The primary side unit of the linear motor according to the present invention, as shown in FIG.
The core with ears, which is obtained by punching out the thin plate in a shape in which the ears 11A are attached to both ends of the lower edge of the rectangular thin plate, is laminated on the laminated core 11 having the thickness L by using a jig, rivet caulking, or welding, or It is fixed by automatic crimping etc. in the pressing process. Then, press-fitting mounting metal fittings are fixed to both side surfaces of the laminated ear cores by welding or the like, or the ear portions are sandwiched by press-working mounting metal fittings 12 from both side surfaces.

[0007]

Since the primary unit of the linear motor according to the present invention is constructed as described above, it has the following effects. The manufacturing cost can be reduced. Improvement of core assembly accuracy → Improvement of air gap accuracy with secondary unit → Reduction of air gap ・ Improvement of motor efficiency can be expected. Even if the core stacking dimension is changed according to the thrust required for the linear motor, the mounting position pitch of the linear motor can be made constant within a certain range.

[Brief description of drawings]

FIG. 1 shows a primary side unit of a linear motor according to the present invention, (A) is a plan view, (B) is a front view of (A), and (C) is a side view of (B).

FIG. 2 shows a primary side unit of a conventional linear motor, (A) is a plan view, (B) is a front view of (A),
(C) is a side view of (B).

FIG. 3 is a sectional side view of a primary side unit of the conventional linear motor shown in FIG.

[Explanation of symbols]

 1: Laminated core 2: Tightening material 3: Bolt 4: Nut 5A, 5B: Mounting foot 11: Laminated core 11A: Ear portion 12: Mounting bracket

Claims (1)

[Claims] 1. A rectangular core of thin plates is provided with ears at both ends of a lower edge thereof, and ear cores obtained by punching the thin plates are laminated and fixed to both sides of the ears of the laminated ear cores. A primary side unit of a linear motor, characterized in that a press-fitted mounting bracket is fixed to each other, or the ears are sandwiched from both sides by a press-processed mounting bracket.