JP2876938B2 - Commutator assembly structure for linear motor - Google Patents

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 particular, the present invention relates to an assembling structure of a commutator in a rail of the linear motor.

[0002]

2. Description of the Related Art Conventionally, in a linear motor of this type, a slit-shaped housing portion is formed on an inner surface of an upper wall of a rail, and a commutator made of a flexible printed circuit board (FPC) is inserted and held in the slit-shaped housing portion. It is.

[0003]

However, in such a configuration, when the rail is formed by extrusion or drawing from an aluminum material, the clearance dimension of the above-mentioned slit-shaped storage portion is limited by the above-mentioned molding. Is usually required to be 1 mm or more, whereas the commutator has a thickness of 0.2 mm or less. For this reason, when the commutator is inserted into the slit-shaped storage portion as described above, there is a problem that the commutator moves in the thickness direction in the storage portion, and the commutator is rattled and difficult to stabilize. Further, even if the clearance dimension of the above-mentioned slit-shaped storage portion can be reduced to 1 mm or less, in order to ensure the ease of insertion of the commutator into the slit-shaped storage portion, the above-mentioned clearance size of the commutator should be reduced. It must be somewhat larger than the thickness. Therefore, this also hinders stable assembly of the commutator in the slit-shaped storage portion.

Further, since a direct current voltage must be constantly applied to the commutator inserted into the slit-shaped storage section via a wire harness fixed to the end of the rail, one end of the commutator is connected to the wire harness. Is connected to the corresponding end of the rail, but the other end of the commutator is often free and not fixed. Therefore, when the mover moves in the rail while contacting the current collector with the commutator,
In this movement process, the commutator causes a waving phenomenon along the longitudinal direction at an intermediate portion thereof, resulting in poor contact between the current collector and the commutator, and as a result, the mover becomes immovable, This causes a problem that the thrust is reduced.

In view of the above, the present invention provides a linear motor in which a commutator is stably assembled in a slit-shaped storage portion formed on an inner surface of an upper wall of a rail, and the commutator is fixed. An object of the present invention is to provide a commutator assembling structure that prevents rattling of a child. Further, the present invention, in order to cope with the above, the slit-shaped storage portion is formed in an arc-shaped cross section projecting to the current collector side,
The purpose of the present invention is to make the commutator bend in the width direction so as to prevent a wavy phenomenon in the longitudinal direction of the commutator.

[0006]

According to a first aspect of the present invention, a rail having a substantially U-shaped cross section and magnetic poles are alternately arranged in the rail along the longitudinal direction. A permanent magnet, a mover including a plurality of coils movable by being guided by the rail, a current collector provided on a surface of the mover facing the rail, and connected to each of the coils; Opposed to the electron, it is inserted and held in a slit-shaped storage portion formed on the inner surface of the rail, and in the same direction as the mover according to the relative position of the mover and the permanent magnet by contact with the current collector. FP that switches the direction of the current flowing through each coil so that the thrust is generated
The linear motor having the commutator made of C is characterized in that it is configured as follows. That is, the configuration of the present invention is characterized in that the slit-shaped storage portion is formed with a large clearance dimension, and a protrusion for absorbing backlash of the commutator is provided in the center of the bottom surface along the longitudinal direction.

[0007]

According to the present invention, the commutator inserted into the slit-shaped storage portion of the rail is provided at the center of the center of the bottom surface of the slit-shaped storage portion. Since the movement in the thickness direction is prevented by the projection, the commutator can be stably assembled in the slit-shaped storage portion without rattling. In such a case, since the clearance dimension of the slit-shaped storage portion is large, it is easy to insert the commutator into the slit-shaped storage portion.

According to a second aspect of the present invention, in the case where the slit-shaped storage portion is formed in an arc-shaped cross section protruding toward the current collector, the movable portion is movable even if the commutator has a free end. In the process in which the current collector moves in the rail while contacting the current collector with the commutator, the commutator does not cause a waving phenomenon at an intermediate portion thereof, and the contact between the current collector and the commutator does not occur. In addition, smooth movement and thrust of the mover can be favorably maintained. In the first or second aspect of the present invention, when both the left and right corners in the width direction of the bottom surface of the slit-shaped storage portion are inclined surfaces, the deformation of the commutator in the width direction can be surely suppressed. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an example of a linear motor to which the present invention is applied.
And a movable element M accommodated in the stator S so as to be slidable in the longitudinal direction. Stator S is rail 1
The rail 10 is formed by extrusion molding or drawing molding from an aluminum material so as to have a substantially inverted U-shaped cross section shown in FIG.
Inside the rail 10, both right and left guide walls 2 each having a substantially U-shaped cross section are provided at a vertically intermediate portion between the left and right side walls 11 and 12.
The guide walls 20, 30 are formed integrally, and longitudinal permanent magnets 40, 50 are accommodated in the respective guide walls 20, 30. The permanent magnets 40 and 50 are arranged so that the magnetic poles are alternated along the longitudinal direction. In FIG. 1, reference numerals 40a and 50a indicate yokes.

Next, the structure of the main part of the present invention will be described. As shown in FIGS. 1 and 2, a slit-shaped storage portion 14 is opened in the inner surface of the upper wall 13 of the rail 10. It is formed as follows. A commutator R is inserted and assembled in the housing portion 14 in the longitudinal direction.
As shown in FIG. 1 and FIG. 2, the left and right peripheral edges 14a and 14b of the opening 4 prevent the falling off. In addition, storage section 1
The bottom surface of 4 is formed at the left and right central portions thereof (regions corresponding to the pair of left and right current collectors 80 and 80 of the mover M) so as to protrude toward the opening side as projections 14c having flat portions.

In such a case, the clearance between the inner surfaces of the left and right peripheral edges 14a and 14b of the storage portion 14 with respect to the bottom surface of the storage portion 14 is about 1 mm.
c and the inner surface of each of the left and right opening peripheral portions 14a and 14b of the storage portion 14 is determined by the thickness of the commutator R (for example, 0.2
mm). In addition, at the left and right corners of the bottom surface of the storage portion 14, the respective inclined surface portions 14d and 14e are shown in FIGS.
Are formed as shown in FIG.
d and 14e prevent the right and left side edges of the commutator R from being deformed toward the bottom surface side of the storage portion 14. The commutator R is formed of a long flexible printed circuit board (FPC) formed by attaching a copper thin film to a polyester thin film. The commutator R is fixed at one end to one end of the rail 10, and the other end of the commutator R is a free end. The fixed end of the commutator R is connected to a DC power source via a wire harness.

The mover M is interposed between the left and right guide walls 20 and 30 in the rail 10 so as to be slidable along its longitudinal direction. 30
A head 60 slidably mounted in the longitudinal direction over the body, a torso 70 hanging down from the center of the head 60 between the opposing portions of the left and right guide walls 20, 30, and an upper surface of the head 60 61, a plurality of pairs of current collectors 80, 80 protruding from the central portion. However, each of the plurality of coils included in the body 70 is connected to each pair of current collectors described above. Thus, the mover M has the commutator R and the current collectors 80, 8 of each pair.
In a state where the coils are in contact with each other, the commutator R controls the current flowing through each coil so that thrust is generated in the same direction in the mover M according to the relative position between the mover M and the permanent magnets 40 and 50. The direction is switched, and the head 60 is moved to each guide wall 20, under the electromagnetic action generated between the permanent magnets 40, 50.
The rail 30 moves in the longitudinal direction of the rail 10 while sliding. The illustrated example is a linear motor for opening and closing a curtain. A number of curtain runners C are fitted below the rail 10 so as to be movable in the longitudinal direction. The mover M is engaged with C via an engagement member.

In the embodiment constructed as described above,
The commutator R inserted into the storage portion 14 of the rail 10 is restrained from moving in the thickness direction by the projection 14c of the storage portion 14 at the center thereof. To the left and right opening peripheral edges 14a, 14b of the storage portion 14.
And is stably assembled in the storage section 14 without rattling. In addition, storage section 1
At the left and right corners of the bottom surface of No. 4, each inclined surface portion 14d, 14
Since e is formed as shown in FIGS. 1 and 2, deformation of the left and right side edges of the commutator R to the bottom surface side of the storage portion 14 can be reliably suppressed by the inclined surfaces 14 d and 14 e. . Therefore, poor contact between the commutator R and each pair of current collectors 80, 80 is reliably prevented. Also, the storage unit 14
Since the clearance dimension of the storage portion 14 with respect to the inner surfaces of the left and right opening peripheral portions 14a and 14b is about 1 mm,
The rail 10 can be molded under the conditions of extrusion molding or drawing molding with ordinary aluminum.

Next, a modification of the above-described embodiment will be described with reference to FIG. 3. In this modification, a section protruding toward the current collectors 80, 80 in the storage section 14 described in the above-described embodiment. As shown in FIG. 3, both the left and right opening peripheral portions 14a, 14b and the projection 14c of the storage portion 14 are formed in an arc shape as the left and right opening peripheral portions 14A, 14B and the projection 14C. 14C is further protruded along the longitudinal direction toward the opening side of the accommodating portion 14 than in the case of the above-described embodiment, and the commutator R is arranged so that each pair of current collectors 80, 80 around the central portion in the width direction. The configuration is characterized in that it is deformed and held in an arc shape toward. Other configurations are the same as those in the above embodiment.

In the present modified example having the above-described structure,
Even if the other end of the commutator R is a free end, the commutator R
Since it is deformed and held in an arcuate cross section, the rigidity is high in the longitudinal direction. Accordingly, the mover M is provided with each pair of current collectors 80,
In the process of moving the rail 80 while contacting the commutator R with the commutator R, the commutator R does not cause a waving phenomenon at an intermediate portion between the current collector 80 and the commutator R. And smooth movement and thrust of the mover can be favorably maintained.

In the modification, the protrusion 14C
Is described as an example in which the shape is uniformly arcuate. Instead of the protrusion 14C, for example, as shown in FIG. 4, a pair of semicircular cross sections projecting from the bottom surface of the storage portion 14 at intervals. The commutator R is connected to each pair of current collectors 8 by the projections 14f and 14g.
The same operation and effect as in the above-described modified example can be ensured even when the present embodiment is bent toward the 0 and 80 sides. In such a case, each projection 14f,
14g is desirably opposed to each pair of current collectors 80 via a commutator R.

In the embodiment of the present invention, the rail 10
Is not limited to an aluminum material, but may be any non-magnetic material that can be molded.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a linear motor showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is an enlarged cutaway view of a main part showing a modification of the embodiment.

FIG. 4 is an enlarged cutaway view of a main part showing a partial modification of the modification.

[Explanation of symbols]

10 ... rail, 13 ... upper wall, 14 ... storage part, 14a, 1
4A, 14b, 14B: Left and right opening peripheral edges, 14c, 1
4C, 14f, 14g ... projection, 20, 30 ... guide wall, M
... mover. R: commutator, S: stator.

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Uemura 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Toyota Auto Body Co., Ltd. (56) References JP-A-5-300720 (JP, A) JP-A-63 −314162 (JP, A) Fully open 63-127476 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 41/02 H02K 41/035 B60L 13/02

Claims (3)

(57) [Claims] 1. A rail having a substantially U-shaped cross section, permanent magnets arranged such that magnetic poles are alternately arranged in the rail along the longitudinal direction, and a plurality of coils movable by being guided by the rail. And a current collector provided on a surface of the mover facing the rail and connected to each of the coils; and a slit-shaped housing formed on the inner surface of the rail facing the current collector. The direction of the current flowing through each of the coils is adjusted so that thrust in the same direction is generated in the mover according to the relative position between the mover and the permanent magnet by contact with the current collector. A linear motor having an FPC commutator to be switched, wherein a clearance dimension of the slit-shaped accommodating portion is formed large, and a protrusion for absorbing backlash of the commutator is provided at a center of a bottom surface thereof along a longitudinal direction. Commutator assembly structure of a linear motor according to symptoms. 2. The linear motor commutator assembling structure according to claim 1, wherein the slit-shaped housing portion is formed in an arc-shaped cross section projecting toward the current collector. 3. The linear motor commutator assembling structure according to claim 1, wherein both left and right corners in the width direction of the bottom surface of the slit-shaped storage portion are inclined surfaces.