JP2657191B2 - Linear DC 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 DC motor which facilitates processing of lead wires of an armature coil.

[0002]

2. Description of the Related Art For example, a conventional multi-pole and multi-phase movable magnet type linear DC brushless motor will be described. This movable magnet type linear DC brushless motor mainly comprises a slider constituting a moving element and a stator. A coreless stator armature is provided.

A coreless stator armature having a coreless structure is formed by arranging a plurality of air-core type armature coil groups adjacent to a long plate-like stator yoke so as not to overlap with each other along the moving direction of the slider.

The slider has an N pole and an S pole so that magnetic poles adjacent to each other along the moving direction of the slider have different polarities.
A field magnet having P magnetic poles (P is an integer of 2 or more) is fixed using an appropriate means such as an adhesive, and is configured to move relatively to the coreless stator armature.

[0005] The coreless stator armature is provided with a magnetic pole discriminating element for detecting the N pole and the S pole of the field magnet, and the N pole and the N pole of the field magnet of the magnetic pole discriminating element are arranged. The driver in the power supply control circuit is operated based on the output signal corresponding to the magnetic pole of the south pole, and the armature coil group is supplied with power in an appropriate direction so that a thrust in a predetermined direction is generated.

[0006]

2. Description of the Related Art In order to obtain a multi-pole, multi-phase, movable magnet type linear DC brushless motor having a long stroke length, the armature coils are moved along the slider traveling direction. Therefore, a long coreless stator armature having a long length must be arranged.

Here, as the number of armature coils increases, the number of lead wires electrically connected to the terminals of the armature coils also increases, and the magnetic pole discriminating elements are used in the same number as the armature coils. The addition of the lead wires connected to the output terminal and the power supply terminal of the discriminating element complicates the processing.

The above-mentioned lead wires need to be drawn out of the linear DC brushless motor and connected to an energization control circuit. According to the linear DC brushless motor, these many lead wires are connected between the stator yoke and the slider. It is difficult to pull out of the linear DC brushless motor using the air gap of the motor part, and there is also contact with the slider, field magnet, coreless stator armature, and trouble such as lead wire breakage and tangling Cause

In the case of a linear DC brushless motor having a long stroke length, lead wires must be drawn out from both ends of the brushless motor, which makes the process difficult.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to enable a large number of lead wires such as an armature coil to be drawn out from one end of a linear DC motor having a long stroke length by using a portion having no obstacle. Another object of the present invention is to provide a highly reliable linear DC motor by facilitating the processing of the lead wire and protecting the lead wire which causes a trouble such as a failure of the linear DC motor.

[0011]

Means for Achieving the Object of the Invention The object of the present invention is to
And the field magnet of a pair of opposed spaced apart, 1
A hollow yoke which is disposed between the pair of field magnets and is relatively movable with respect to the field magnets , has a vertical cross-section in a rectangular shape, and has at least one open end ; One pair
Are arranged on the two surfaces facing the field magnet, respectively.
Armature coil and a lead wire electrically connected to the armature coil, the lead wire being provided on the two surfaces.
This can be achieved by guiding the armature coil from the obtained armature coil to the hollow portion of the hollow yoke and taking it out from the one end opening.

[0012]

The lead wire electrically connected to the conductive wiring pattern of the printed wiring board electrically connected to the terminal such as the armature coil is connected to the hollow stator yoke through the through hole formed in the side face stator yoke. Through the hollow portion, one of the open ends of the hollow stator yoke is taken out to the outside of the linear DC brushless motor in a concentrated manner, so that an electrical connection to an external power supply control circuit can be easily made.

[0013]

FIG. 1 is a top perspective view of a multi-pole multi-phase movable magnet type linear DC brushless motor 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the same multi-pole multi-phase movable magnet. 3 is a perspective view of a coreless stator armature 10, and FIG. 4 is a perspective view of a field magnet 4. FIG. Hereinafter, the movable magnet type linear DC brushless motor 1 of the present invention will be described with reference to FIGS.

A hollow portion 5 is formed inside, and open ends 1 are provided at both ends.
The hollow stator yoke 3 having a rectangular cross section and having a vertical section 3 is formed of a hollow member of a magnetic material in advance in order to close the magnetic path of the field magnet 4. Only the stator yokes 3C, 3D may be formed of a magnetic material, and the linear motion guide rail forming portions 3A, 3B at the upper and lower ends thereof may be formed of another material such as light aluminum.

The hollow stator yoke 3 has its longitudinal ends fixed to the fixed side using fixing means (not shown).

The linear guide rails 6A and 6B extending in the longitudinal direction are formed at the linear guide rail forming portions 3A and 3B at the upper and lower ends of the hollow stator yoke 3, respectively. The cam follower block bearings 7A and 7B attached to the upper and lower ends 2A and 2B of the hollow slider 2 having a vertical cross section and having a rectangular cross section are engaged with the linear motion guide rails 6A and 6B, and the hollow slider 2 is straightened. It is configured to be guided by the moving guide rails 6A and 6B and to be movable in the longitudinal direction.

The outer sides of the stator yokes 3C and 3D on both side surfaces of the hollow stator yoke 3 are insulated, and FIG.
(The figure shows only a small number of armature coils 9 for convenience of the drawing.) As shown in FIG.
The coreless stator armature 10 formed by arranging an air-core type armature coil 9 group on the surface thereof is formed on the side surface stator yoke 3 by appropriate means with the armature coil 9 group being an inner surface.
C, fix to 3D surface. That is, the coreless stator armature 10 is protected by the printed wiring board 8 of the coreless stator armature 10 facing the field magnet 4 described later.

The armature coil 9 will be described. The armature coil 9 in this embodiment is formed by winding a number of turns of a conducting wire so as to be a rectangular frame-shaped air-core type. It may be formed by a sheet coil or the like using means, plating means or etching means.

The group of air-core type armature coils 8 has a thrust force extending in a direction perpendicular to the running direction of the hollow slider 2 so that a linear reciprocating 180-degree energizing method with good efficiency and performance can be adopted. When the opening angle between the two effective conductor portions 9a and 9a contributing to the generation is T, where the width of one pole of the N and S poles in the traveling direction of the field magnet 4 described later in the running direction of the hollow slider 2 is T. The winding is formed so as to have an opening angle of width T.

In the armature coil 9, the two conductors 9b parallel to the moving direction of the hollow slider 2 are conductors that do not contribute much to the generation of thrust.

The armature coil 9 has two conductor portions 9b which do not contribute much to the generation of the thrust and a length extending to the outside of the conductor portion 9b is set to a width substantially equal to the width of the field magnet 4 in that direction. I do.

The printed circuit board 8 includes an armature coil 9
A magnetic pole discriminating element 11 for position detection for switching energization of the armature coil 9 group according to the group and the magnetic pole state of the field magnet 4 is arranged, and power is supplied to the armature coil 9 and the magnetic pole discriminating element 11. In addition to the supply, a conductive wiring pattern (not shown) for obtaining an output signal is formed.

As the magnetic pole discriminating element 11, a Hall I
An appropriate magneto-electric conversion element such as C, Hall element, and magneto-resistance element may be used.

The magnetic pole discriminating element 11 is provided at the inner surface of the printed wiring board 8 at a position where the conductor 5a contributing to the generation of the thrust of the armature coil 9 is extended. The leakage magnetic flux of the S pole can be detected.

Since it is necessary to dispose the magnetic pole discriminating element 11 at the above position, the vertical width of the printed wiring board 8 is
Use a slightly longer armature coil 9 than the width.

On the inner surface of the hollow slider 2 which moves linearly relative to the coreless stator armature 10, an N-pole having a T width is formed so that magnetic poles disposed adjacently along the moving direction of the hollow slider 2 have different polarities. , S magnetic poles (P is 2
Field magnets 4 formed adjacent to each other at equal intervals (the above integers).
Is fixed using an appropriate means such as an adhesive.

A driver in an energization control circuit (not shown) operates based on output signals from the magnetic pole discriminating element 11 corresponding to the N and S poles of the field magnet 4 to generate thrust in a predetermined direction. As described above, the armature coils 9 are energized in appropriate directions.

In the movable magnet type linear DC brushless motor 1 having the above-described configuration and operation, although it is drawn small in FIG. 1 for convenience of the drawing, the movable magnet type linear DC brushless motor 1 having a long stroke length is used. In practice, a large number of lead terminals 12 such as a group of armature coils 9 must be led out of the linear DC brushless motor 1 and connected to an external energization control circuit. Furthermore, since the number of power supply terminals and output terminals of the magnetic pole discriminating element 11 is also required by the number of the armature coils 9, the number of these lead wires 12 becomes very large.

As in the prior art, these many leads 12
It is difficult to pull the linear DC brushless motor 1 out of the linear DC brushless motor 1 using the gap between the hollow stator yoke 3 and the hollow slider 2, and contact with the slider 2, the field magnet 4, and the coreless stator armature 10 is also difficult. This may cause a trouble such as disconnection or entanglement of the lead wire 12.

Therefore, according to the present invention, in the movable magnet type linear DC brushless motor 1, as shown in FIG. After passing through the through-holes 14 formed in the side face stator yokes 3C and 3D and leading to the hollow portion 5 of the hollow stator yoke 3, it is intensively drawn out from one open end 13 of the hollow stator yoke 3, and is not shown in the figure. Connected to circuit side.

[0031]

[Other Embodiments] In the above embodiment, the movable magnet type linear DC brushless motor has been described. However, the present invention is also applicable to a movable magnet type linear DC motor that rectifies using a brush and a commutator, and an iron core type linear DC motor. Of course, the present invention is applied, and it goes without saying that the present invention is also applied to a movable armature type linear DC motor using an armature as a moving element.

[0032]

According to the linear DC motor of the present invention, since the hollow portion inside the hollow stator yoke having no obstacle is used as a path for the lead wires, a large number of lead wires such as armature coils are connected to the linear DC motor. It is not necessary to pull out from the motor part of the motor, and trouble such as failure of the linear DC brushless motor can be reduced. Even when a linear DC motor having a long stroke length has a large number of leads, the lead can be pulled out from one opening end of the yoke without being led out from both ends of the linear DC motor, so that the processing of the lead wires becomes easy. Further, in the present invention, a pair of opposing field magnets is provided.
Facing the net and the pair of field magnets, respectively.
Armature coils provided on two surfaces of the hollow yoke
The motor is used without increasing the size of the motor.
High output can be obtained efficiently.

[Brief description of the drawings]

FIG. 1 is a top perspective view of a multi-pole and multi-phase movable magnet type linear DC brushless motor as one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the same multi-pole and multi-phase movable magnet type linear DC brushless motor viewed from a running direction of a slider.

FIG. 3 is a perspective view of a coreless stator armature.

FIG. 4 is a perspective view of a field magnet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 movable magnet type linear DC brushless motor 2 hollow slider 3 hollow stator yoke 3A, 3B linear guide rail forming portion 3C, 3D side portion stator yoke 4 field magnet 5 hollow portion 6A, 6B linear guide rail 7A, 7B cam follower block Bearing 8 Printed wiring board 9 Armature coil 9a Conductor part that contributes to generation of thrust 9b Conductor part that does not contribute much to generation of thrust 10 Coreless stator armature 11 Magnetic pole discriminating element 12 Lead wire 13 Open end 14 Through hole

Claims (1)

(57) [Claims] 1. A pair of field magnets facing each other at an interval, and disposed between the pair of field magnets.
It can move relative to the field magnet ,
A hollow yoke having a rectangular cross section and open at least at one end; and a pair of the field magnets of the hollow yoke.
An armature coil disposed on each of the two opposing surfaces, and a lead wire electrically connected to the armature coil, wherein the lead wire is provided on the armature coil disposed on the two surfaces.
Le, is guided in the hollow portion of the hollow yoke, a linear direct current motor, characterized in that is adapted taken out from the one end opening.