JPH02299456A - Linear motor - Google Patents

Abstract

PURPOSE:To increase rigidity by clamping and fixing a core body and core holders with clamping members and, at the same time, binding them with reinforcing ribs and a core bar fixed in the shape of a ladder. CONSTITUTION:Two core holders 10 are welded and fixed to each other so as to mount by reinforcing ribs 20 and mounting holders 18 arranged at about the same position as that of a projection 8f of an electric steel plate 8a and on such a position as they don't interfere with the projection 8f. After that, a core bar 23 is inserted into a through-hole 8g of the projection 8f on the rear 8c of a core 8, bolts 27 are inserted into tap-holes 23a having an equal pitch to each through-hole 20a of the reinforcing ribs 20, and the reinforcing ribs 20 and core bar 23 are clamped to the rear 8c of the core body 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a near motor, particularly a vehicle linear motor, which eliminates distortion between core gaps and improves rigidity.

(Prior Art) In recent years, in electric vehicles, instead of conventional main electric motors and drive devices, means for directly propelling and traveling the vehicle using a linear motor are being used. This kind of rim (
LIM) Toren is poised to become an optimal and practical system for urban transportation in the future.

As shown in FIGS. 13 to 14, this kind of linear motor is constructed by first placing a rail 1 on the ground 2, and then running a vehicle body 4 supported by wheels 3 on the rail 1. ing. A linear motor 5 is attached below the vehicle body 4, and the linear motor 5 and a secondary conductor 7 made of an aluminum plate or the like are arranged to face each other with a gap 6 interposed therebetween. Note that this secondary conductor 7 is laid in parallel to the rail 1. The secondary conductor 7 serves as a primary side and generates thrust between it and the linear motor 5 to drive and run the vehicle body 4 along the rail 1.

The linear motor 5 includes an iron core body 8, and both sides of the iron core body 8 are sandwiched between tampons 9 to form an iron core. Furthermore, both sides of the core are clamped and fixed with core holders 10 that serve as a frame for the linear motor 5. Coil covers 11 each having a U-shaped cross section are arranged on the outside of the core retainer 10, and the folded legs 11a and tightening bolts 12
The coil cover 11 is fixed in place, and the other leg portion 11b of the coil cover 11 is fixed to the lower end portion of the tampon 9 with a tightening bolt 13. In addition, this tampan 9 is the iron core body 8.
The head of the tightening bolt 13 is configured to not protrude below the lower end surface of the core body 8.

As shown in FIG. 14, the core body 8 and the tampan 9 are
Each of them is made up of a plurality of laminated electric iron plates 8a and 9a. A plurality of slots (not shown) are cut into the lower sides of the electric iron plates 8a, 9a, so that the lower sides of the electric iron plates 8a, 9a are formed into a comb-teeth shape. By forming this comb-teeth shape, a coil storage groove (shown) that communicates with the longitudinal direction is formed in the lower side of the laminated core body 8 and tampan 9, and the coil 14 is stored therein. , and are fixed by wedges 15.

(Problems to be Solved by the Invention) In the rim train, the dimensions of the gap 6 between the linear motor 5 and the secondary conductor 7 must be maintained and managed within a determined range. Therefore, in order to prevent the dimensions of the gap 6 from changing during operation of the vehicle, as shown in FIG. Directly attach 17 to stand 18
It is installed on. Further, the propulsive force generated from the linear motor 5 is transmitted to the vehicle body 4 by a traction rod 19 that is pivotally supported by the core presser 10.

However, in such a near motor 5, the axle 1
Since this is a one-sided type linear linear motor supported between the linear motor 5 and the secondary conductor 7, a large suction force f acts between the linear motor 5 and the secondary conductor 7 during vehicle operation, and the iron core body 8 is supported as shown in FIG. This causes a large deflection in the longitudinal center of the core holder 10. Therefore, in order to minimize the dimensional change of the gap 6, the core body 8 and the core holder 1 are
It is necessary to reduce the deflection of the 0 and make it a strong structure.

Further, when used in a low-floor vehicle, the height dimension of the linear motor 5 is limited, and furthermore, the weight is significantly limited in order to reduce the unsprung weight.

Therefore, in order to solve these problems, as shown in FIG. 16 and FIG. 20 is welded and fixed while maintaining a gap G that does not make contact with the back surface portion 8C of the core body 8. After appropriately removing welding distortion, machining is performed on the required parts such as the mounting base 18 shown in FIG. It was devised to improve the rigidity of the entire frame by welding and fixing the reinforcing ribs 20 (points indicated by W).

However, even in this method, as shown in FIG. 17, due to heat shrinkage due to welding, a tensile force is generated in the gap formed between the reinforcing rib 20 and the core body 8, causing the core body 8 to Deflection occurs due to strain. Therefore, the laminated electric iron plates 8a move slightly by δ, and the iron core gap surface 8b becomes uneven. As a result, 2
A problem arises in that the dimension of the gap 6 with the secondary conductor 7 changes, making it impossible to obtain the specified performance as a linear motor.
It was extremely difficult to realize the above-mentioned fixing method by welding.

The present invention has been made in view of the above points, and in addition to clamping and fixing both sides of electrical steel plates laminated with studs with core holders, the present invention also fixes the core provided on the back side of the core and reinforcing ribs with a fastening member. The purpose is to fix the frame and core body together to increase their rigidity, and to make the frame lighter and more compact, as well as to provide a near motor.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a linear motor having an iron core formed by sandwiching both end faces of laminated electric iron plates with iron core holders and fastening them with fastening members. Configure. Then, a plurality of reinforcing ribs are fixed in a ladder shape, spanning between the core holders and maintaining a gap that does not touch the back surface of the core, and then supporting the core by supporting the back surface of the core and the side surfaces of the reinforcing ribs. They are secured to each other by material.

(Function) In the linear motor of the present invention configured as described above, the core body and the core holder are not only fastened and fixed by the fastening member, but also connected by the reinforcing ribs fixed in the shape of a ladder and the core bar. , the rigidity in the direction of the attractive force generated between the linear motor and the secondary conductor is improved, and the deflection occurring in the longitudinal direction of the linear motor is reduced.

(Example) Examples of the linear motor of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the linear motor 5 and the secondary conductor 7 are arranged to face each other with a gap 6 interposed therebetween. The linear motor 5 includes an iron core body 8,
Both sides of the iron core body 8 are sandwiched between tampons 9 to form an iron core. Furthermore, both sides of the core are clamped and fixed by core holders 10 that serve as a frame for the linear motor 5. A coil cover 11 having a U-shaped cross section is disposed on both sides of the core holder 10, and the coil cover 11 is fixed to the core holder 10 using the folded legs 11a and tightening bolts 12. The other leg 11b is fixed to the lower end of the tampan 9 with another tightening bolt 13. Also,
The tamp 9 is formed to have a dimension shorter than the height of the core body 8, and the head of the tightening bolt 13 is attached to the lower end surface of the core body 8 (
It is configured so as not to protrude below the iron core gap surface) 8b.

As shown in FIGS. 2 and 3, each electrical iron plate 8a constituting the core body 8 has a side surface facing the secondary conductor 7 (gap surface).
A plurality of comb-shaped slots 8d are formed at equal intervals on the side,
Furthermore, a plurality of through holes 8e into which studs 24 are inserted are formed at equal intervals between the back surface 8c of the electric iron plate 8a and the slot 8d. Furthermore, the back part 8c of the electric iron plate 8a
A plurality of protrusions 8f having a convex shape are formed protrudingly formed on the protrusion 8f, and a through hole (square hole) 8g for inserting the core metal 23 is formed in the protrusion 8f as shown in the figure.

As shown in FIGS. 6 and 7, the core holder 10 has a rectangular strip shape having approximately the same length as the core body 8, and has the same pitch as the through holes 8e for fastening studs formed in the electrical iron plate 8a. A through hole 10a is formed in one core holder 10, and a through hole 10b with a concave counterbore is formed in the other core holder 10. These two core holders 10 are
Welded and fixed to each other so as to straddle the reinforcing rib 20 and the mounting base 18, which are arranged at almost the same position as the protrusion 8f of the electric iron plate 8a and at a position that does not interfere with the protrusion 8f,
It is constructed as a one-piece frame 22. Further, a plurality of through holes 20a are formed in the reinforcing rib 20 in the direction of the back surface of the core body 8.

To fix the core body 8 and the frame 22, first, turn the protrusion 8f of the core body 8 toward the reinforcing rib 20 side and press the core presser 1.
0, and then the through hole 8e of the electric iron plate 8a and the through hole 10a of the iron core holder 10.

A stud 24 having threaded ends is inserted into 10b. One of the through holes 10 in which a counterbore was formed
A nut 25 is screwed into b to fix one end of the stud 24. Further, a spacer 26 having a through hole 26a in the center as shown in FIG. 8 is inserted into the other through hole 10a of the core holder 10. Note that, as shown in FIG. 9, the thickness of this spacer 26 is thinner than the thickness T2 of the core holder 10, and its outer shape is smaller than the through hole 1 of the core holder 10.
It is smaller than the pore diameter D' of 0a. Furthermore, the other end of the stud 24 is passed through the through hole 26a of the spacer 26, and another nut 25 is screwed together with the other end of the stud 24 and the screw is tightened. The resulting parts are fixed together by welding (indicated by W) to form the core body 8, as shown in FIG.
and the frame 22 are integrated. After that, it is annealed and the necessary parts are machined. Next, as shown in FIGS. 1 and 2, the through hole 8g of the protrusion 8f in the rear view 8C of the iron core 8 is
Insert the core bar 23 (Figs. 4 and 5) into the reinforcing rib 20.
The bolts 2 are inserted into the tapped holes 23a at the same pitch as the through holes 20a.
7, and tighten the reinforcing rib 20 and the mandrel 23 to the back surface 8C of the core body 8, thereby integrating the core body 8 and the frame 22. Here, as shown in FIGS. 4 and 5, the core bar 23 has a length that is somewhat smaller than the inner dimension between the core holders 10 shown in FIG. 1, and a cross section that can be fitted into the through hole 8g. The through hole 2 of the reinforcing rib 20
It has tap holes 23a with the same pitch as 0a. Then, the coil 14 is stored in the slot 8d of the core body 8, and fixed to the core body 8 from the lower surface with the wedge 15. Finally, the folded leg 11a of the U-shaped coil cover 11 is fixed to the core holder 10 with a tightening bolt, and the other leg 11b is fixed to the lower end of the tampon 9 with a tightening bolt 13. do. This completes the assembly of the linear motor 5 main body.

Further, as other embodiments of the present invention, FIGS.
It is also possible to employ diagrams.

First, in the embodiment shown in FIG. 10, the electric iron plate 28 includes:
The back surface part 8C is made flat without forming a protrusion, and the core metal 2
3 is disposed astride between the slot 28a formed in the electric iron plate 28 and the back surface 8C of the electric iron plate 28, and the bolt 27
The reinforcing rib 20 and the mandrel 23 are connected to the tapped hole 23 of the mandrel.
Tighten and secure using a. According to this embodiment, the weight of the near motor is reduced due to the absence of the protrusion, and
Reducing the dimension in the height direction provides nI capability.

Furthermore, since there are no protrusions, the yield when punching the electrical iron plate 28 from the raw material is improved.

Further, in the embodiment shown in FIG. 11, the dimension of the core bar 29 is increased by 11 in the longitudinal direction (X arrow direction) of the electric iron plate 30, and a plurality of bolts 27 are arranged in the longitudinal direction, so that the core retainer 10
Reinforcement rib 31 straddled between and mandrel 2 disposed below it
9 are fastened or fixed with bolts 27. According to this embodiment, high rigidity of the linear motor is guaranteed, and in particular, the strength against vibration during operation is greatly improved.

〔Effect of the invention〕

According to the present invention, the rigidity of the frame of the linear motor in the direction of the attractive force generated between the linear motor and the secondary conductor is greatly improved, and the deflection in the longitudinal direction of the frame is greatly reduced. Therefore, since the height of the linear motor can be limited as much as possible, a linear motor that is optimal for low-floor heavy vehicles can be obtained, and since the rigidity can be improved without increasing the height of the linear motor, its weight can be reduced. Furthermore, the increased rigidity of the frame allows it to withstand vibrations during driving, which has the remarkable effect of making it adaptable to high acceleration and high speeds of vehicles using linear motors (rim trains). Further, since the core body integrated with the metal core and the reinforcing rib can be fastened and fixed by the fastening member without welding, distortion due to welding does not occur, and the core gap surface can be made uniform.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of the linear motor of the present invention, Fig. 2 is a partial sectional view taken along arrows - - ■ of Fig. 1, Fig. 3 is a side view of an electric iron plate used in the linear motor of the invention, and Fig. 4 is a Similarly, FIG. 5 is a partial perspective view of the core body, FIG. 6 is a plan view of the frame, and FIG. 7 is a side view thereof.
Figure 8 is a perspective view of the spacer, and Figure 9 is A of Figure 1.
FIG. 10 is a partial cross-sectional view of another embodiment of the present invention, FIGS. 11 and 12 are partial cross-sectional views of still another embodiment of the present invention, and FIG. 13 is a partial cross-sectional view of a conventional adhesive. 14 is a perspective view of only the linear motor, FIG. 15 is a partial sectional view taken from the direction of the X arrow in FIG. 13, and FIG. 16 shows the reinforcing ribs directly attached to the core body FIG. 17 is a front cross-sectional view of a conventional welded linear motor, and a side view showing the bent state of the core body. 5... Linear motor, 7... Secondary conductor, 8... Core body, 10... Core holder, 20... Reinforcement rib, 2
3... Core metal, 24... Stud. Figure 1 Figure 2 Garden d Comic a Figure 4- Figure Easy 5 Figure 6 Figure 2 Figure 8 Figure θ Figure 10 Figure 乎 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Man 17 Figure

Claims (1)

[Claims] In a linear motor having an iron core formed by sandwiching both end faces of laminated electric iron plates with iron core holders and fastening and fixing them with a fastening member, the linear motor straddles between the iron core holders, and
A plurality of reinforcing ribs are fixed in a ladder shape while maintaining gaps that do not touch the back surface of the core, and a core metal is attached to an electrical iron plate close to the back surface of the core in the stacking direction of the reinforcing ribs. A linear motor in which a rib and a metal core are fixed to each other with a fastening member.