JPH06165473A - Linear dc motor - Google Patents

Abstract

PURPOSE:To treat leads easily while protecting the leads so as not to generate trouble such as the fault of a linear DC motor, and to obtain the linear DC motor having high reliability by leading out a large number of the leads of an armature coil, etc., from one end section by utilizing a section having no fault even in the linear DC motor having long stroke length. CONSTITUTION:A yoke, to which an armature 10 relatively moved to a field magnet 4 is disposed, is formed in a hollow yoke 3, in which at least one end is opened, leads 12 electrically connected at the terminals of an armature coil 9 are introduced into the hollow section of the hollow yoke 3, and the leads 12 are led out to the outside only from one-end opening section 13 of the hollow yoke 3.

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 armature coil lead wires.

[0002]

2. Description of the Related Art For example, a conventional multi-pole multi-phase movable magnet type linear DC brushless motor will be described. This movable magnet type linear DC brushless motor mainly comprises a slider which constitutes 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 each other on a long plate-shaped stator yoke so as not to overlap each other along the moving direction of the slider.

The slider has N poles and S poles so that adjacent magnetic poles are different poles along the moving direction of the slider.
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 relative to the coreless stator armature.

A magnetic pole discriminating element for detecting the magnetic poles of the N pole and the S pole of the field magnet is arranged in the coreless stator armature, and the N pole of the field magnet of the magnetic pole discriminating element, The armature coil group is energized in an appropriate direction so that a driver in the energization control circuit is actuated based on an output signal corresponding to the magnetic pole of the S pole to generate thrust in a predetermined direction.

[0006]

Problem to be Solved by the Invention When an attempt is made to obtain a multi-pole multi-phase movable magnet type linear DC brushless motor having a long stroke length as described above, the armature coil group is moved along the traveling direction of the slider. It is necessary to construct a long coreless stator armature in which a large number are arranged.

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

The above-mentioned lead wires need to be drawn out of the linear DC brushless motor and connected to the 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 draw it out of the linear DC brushless motor by using the air gap in the motor part of the motor, and there is also contact with the slider, field magnet, and coreless stator armature, which causes problems such as lead wire disconnection and entanglement. Cause to cause.

Further, in the case of a linear DC brushless motor having a long stroke length, the lead wire has to be drawn out from both ends of the motor, which makes the processing 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 pulled out from one end of a linear DC motor having a long stroke by utilizing a non-obstructed portion. The purpose of the present invention is to obtain a highly reliable linear DC motor by facilitating the processing of the lead wire and protecting the lead wire which causes troubles such as failure of the linear DC motor.

[0011]

An object of the present invention is to provide a field magnet and a hollow yoke having at least one end in which an armature coil moving relative to the field magnet is disposed. , A lead wire electrically connected to the armature coil, and this lead wire can be achieved by guiding the lead wire to the hollow portion of the hollow yoke and taking it out from the opening at one end thereof.

[0012]

The lead wire electrically connected to the conductive wiring pattern of the printed wiring board electrically connected to the terminal of the armature coil or the like is connected to the hollow stator yoke through the through hole formed in the side surface stator yoke. By centrally taking out from the opening portion of one end of the hollow stator yoke to the outside of the linear DC brushless motor through the hollow portion, electrical connection can be easily made to the external energization control circuit.

[0013]

1 is a top perspective view of a multi-pole multi-phase type movable magnet type linear DC brushless motor 1 as one embodiment of the present invention, and FIG. 2 is the same multi-pole multi-phase type movable magnet. FIG. 3 is a vertical sectional view of the linear DC brushless motor 1 viewed from the traveling direction of the hollow slider 2, FIG. 3 is a perspective view of the coreless stator armature 10, and FIG. 4 is a perspective view of the field magnet 4. The movable magnet type linear DC brushless motor 1 of the present invention will be described below with reference to FIGS. 1 to 4.

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

Both ends of the hollow stator yoke 3 in the longitudinal direction are fixed to the fixed side by using fixing means (not shown).

Linear guide rails 6A and 6B extending in the longitudinal direction are formed in the linear guide rail forming portions 3A and 3B at the upper and lower ends of the hollow stator yoke 3, respectively, and are spaced around the hollow stator yoke 3. The cam follower block bearings 7A and 7B attached to the upper and lower end portions 2A and 2B of the hollow slider 2 having a square cross section and having a rectangular cross section are engaged with the linear guide rails 6A and 6B, and the hollow slider 2 is directly moved. The guide rails 6A and 6B are configured to be movable in the longitudinal direction thereof.

The outer sides of the stator yokes 3C and 3D on both side surfaces of the hollow stator yoke 3 are subjected to insulation treatment.
(The drawing shows only a small number of armature coils 9 for the convenience of the drawing) As shown in FIG.
A coreless stator armature 10 formed by arranging air-core type armature coils 9 adjacent to each other on the surface is provided with the side face stator yoke 3 by an appropriate means with the armature coils 9 being the inner surface.
Fix on C and 3D surfaces. That is, the printed wiring board 8 of the coreless stator armature 10 is made to face the field magnet 4 described later to protect the coreless stator armature 10.

Explaining the armature coil 9, the armature coil 9 in this embodiment is formed by winding a large number of turns of a conductive wire so as to be an air-core type having a rectangular frame shape. It may be formed by a sheet coil using a means, a plating means or an etching means.

The air-core type armature coil group 8 has a thrust force extending in a direction orthogonal to the traveling direction of the hollow slider 2 so that a linear reciprocating 180-degree energization method having good efficiency and performance can be adopted. When the open angle between the two effective conductors 9a and 9a that contributes to the generation is T, where one pole width of the N pole and the S pole in the traveling direction of the hollow slider 2 of the field magnet 4 described later is T. The winding is formed to have an opening angle of the width T.

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

In the armature coil 9, the two conductor portions 9b which do not contribute much to the generation of the thrust and the length to the outside of the conductor portion 9b are formed to have a width substantially equal to the width of the field magnet 4 in that direction. To do.

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

As the magnetic pole discriminating element 11, the Hall I
Appropriate magnetoelectric conversion elements such as C, Hall elements, and magnetoresistive elements may be used.

The magnetic pole discriminating element 11 is disposed on the inner surface of the printed wiring board 8 at a position where the conductor portion 5a contributing to the generation of thrust of the armature coil 9 is extended, and the magnetic pole discriminating element 11 has the N pole, 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 width of the printed wiring board 8 in the vertical direction is
An armature coil having a width slightly longer than the width of the armature coil 9 is used.

On the inner surface of the hollow slider 2 that moves in a straight line relative to the coreless stator armature 10, the N poles having a T width are formed so that adjacent magnetic poles have different poles along the moving direction of the hollow slider 2. , P magnetic poles of S pole (P is 2
Field magnets 4 formed adjacently at equal intervals (the above figure is a four-pole field magnet 4 for convenience of drawing).
Is fixed by using an appropriate means such as an adhesive.

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

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

As is conventional, a large number of these lead wires 12
It is difficult to draw out to the outside of the linear DC brushless motor 1 using the gap between the hollow stator yoke 3 and the hollow slider 2, and the slider 2, the field magnet 4, and the coreless stator armature 10 also come into contact with each other. This is a cause of trouble such as disconnection and entanglement of the lead wire 12.

Therefore, in the present invention, in the movable magnet type linear DC brushless motor 1, the lead wires 12 such as the armature coil group 9 are the lead wires 12 drawn from the printed wiring board 8 as shown in FIG. After passing through the through-holes 14 formed in the side surface stator yokes 3C and 3D and guiding it to the hollow portion 5 of the hollow stator yoke 3, the hollow stator yoke 3 is concentrated and pulled out from one open end 13 to control the energization not shown. It is connected to the circuit side.

[0031]

[Other Embodiments] In the above embodiments, the movable magnet type linear DC brushless motor has been described. It goes without saying that the present invention is applied, and naturally, the present invention is also applied to a movable armature type linear DC motor using an armature as a mover.

[0032]

According to the linear DC motor of the present invention, since the hollow portion inside the hollow stator yoke having no obstacles is used as a path for the lead wires, a large number of lead wires such as armature coils are linear DC. Since it does not have to be pulled out from the motor part of the motor, troubles such as breakdown of the linear DC brushless motor can be reduced. Further, even if there are many lead wires in a linear DC motor having a long stroke length, the lead wires 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 lead wires can be easily processed.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view of the same multipole / multiphase movable magnet type linear DC brushless motor as seen from the traveling direction of the 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]

 1 Movable magnet type linear DC brushless motor 2 Hollow slider 3 Hollow stator yoke 3A, 3B Linear motion guide rail forming part 3C, 3D Side part stator yoke 4 Field magnet 5 Hollow part 6A, 6B Linear motion guide rail 7A, 7B Cam follower block Bearing 8 Printed wiring board 9 Armature coil 9a Conductor portion that contributes to thrust generation 9b Conductor portion that does not contribute much to thrust generation 10 Coreless stator armature 11 Magnetic pole discrimination element 12 Lead wire 13 Open end portion 14 Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kamio 4-1-1 Taihei, Sumida-ku, Tokyo Inside the Seikosha Co., Ltd.

Claims (1)

[Claims] 1. A field magnet, a hollow yoke at least one end of which is provided with an armature coil that moves relative to the field magnet, and is electrically connected to the armature coil. A linear DC motor including a lead wire, the lead wire being guided to the hollow portion of the hollow yoke and being taken out from the one end opening portion to the outside.