JPH11341782A - Coil mobile linear dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize reduction in leaked magnetic flux, stroke elongation, thrust increase, downsizing, and price reduction of a coil mobile linear DC motor all together by constituting a part of a yoke which constitutes the stator in such a form as to cover the periphery of other yokes constituting a needle and the stator. SOLUTION: This DC motor is constituted of a second yoke 6 in a plate form, a first yoke having a U-shaped cross section, a first permanent magnet 7 fixed to the end of a stator 1, a second permanent magnet 8 fixed to the other end of the stator, and winding 11 wound a specified interval apart on the second yoke, and specified thrust works in the direction of an arrow A on the winding 11, by having a specified current flow to the winding 11, and specified thrust works in the direction of an arrow B on the winding 11 by having a specified current flow in a different direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to various types of OA equipment, various types of F
A equipment, various optical equipment and various measurement equipment, etc.
It is used for driving various moving parts that dislike vibration and thrust fluctuation, generates thrust without pulsation, reduces the size and weight of the mover, improves responsiveness, reduces leakage magnetic flux, increases long stroke, increases thrust, The present invention relates to a coil movable linear DC motor capable of reducing both size and weight and price.

[0002]

2. Description of the Related Art In general, a coil movable linear DC motor is the only linear motor capable of generating thrust without pulsation. By mounting various position detecting devices and performing servo control, a wide range of thrust and speed can be obtained. And a highly accurate control of the stop position, and can respond to loads that dislike vibrations, loads that dislike thrust fluctuations, and loads that require operation at a wide range of speeds.

FIG. 8 is an explanatory view of the structure of a conventional coil movable linear DC motor. The stator 1 includes a first yoke 2 having a flat plate shape, a second yoke 6 having a flat plate shape disposed parallel to the first yoke 2 at a predetermined distance, and a first yoke 2 and a second yoke 2. Of the end of the second yoke 6 in the direction of arrow B,
A magnetic pole surface having a polarity of N pole is fixed to a surface of the first yoke 2 facing the second yoke 6, and a polarity of an S pole is formed on a surface of the second yoke 6 facing the first yoke 2. A first permanent magnet 7 having a fixed magnetic pole surface, a first yoke 2 and a second
A magnetic pole surface having N-pole polarity is fixed to a surface of the end of the first yoke 2 in the direction of arrow A facing the second yoke 6, and a first yoke of the second yoke 6 is provided. And a second permanent magnet 8 having a magnetic pole surface having the polarity of the S pole fixed to the surface facing the second permanent magnet 2.

[0004] The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in a space 21 formed by the relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

A magnetic flux Φma that increases in proportion to the magnetomotive force of the first permanent magnet 7 is uniformly distributed in the direction shown in the drawing from the end of the space 21 of the stator 1 in the direction of arrow B to the center. The magnetic flux Φmb which is distributed and increases in proportion to the magnetomotive force of the second permanent magnet 8 is uniformly distributed in the range from the end of the space 21 of the stator 1 in the direction of arrow A to the center of the space 21. Distribute.

The magnetic flux Φma is generated by the first yoke 2 and the second yoke 2
When the length of the yoke 6 in the moving direction of the mover 10 exceeds the length determined by the magnetomotive force of the first permanent magnet 7, the volume of the first yoke 2, and the volume of the second yoke 6, the space 21
From the end in the direction of arrow B toward the center with a predetermined inclination. The magnetic flux Φmb is applied to the first yoke 2
And the length of the second yoke 6 in the moving direction of the mover 10 exceeds the length determined by the magnetomotive force of the second permanent magnet 8, the volume of the first yoke 2, and the volume of the second yoke 6. At this time, the space 21 is reduced and distributed with a predetermined inclination from the end in the direction of arrow A toward the center of the space 21.

A magnetic flux Φc that increases in proportion to the magnetomotive force (the product of the number of turns and the current) of the winding is formed around the winding 11 constituting the mover 10 in the illustrated direction. The magnetic flux Φc is distributed in a decreasing manner in the moving direction of the mover with a slope that increases in proportion to the magnetomotive force (the product of the number of turns and the current) of the winding.

The mover 10 applies a predetermined current to the winding 11 in the direction shown in FIG.
The arrow A has a thrust that increases in proportion to the product of ma or the magnetic flux Φmb and the magnetomotive force (the product of the number of turns and the current) of the winding 11.
Direction, and a predetermined current is applied to the winding 11 in a direction different from that shown in the figure, so that the magnetic flux Φma or the magnetic flux Φmb interlinking the winding 11 and the magnetomotive force (the product of the number of turns and the current) of the winding 11 Move in the direction of arrow B with a thrust that increases in proportion to the product of

In order to increase the stroke of the conventional coil movable linear DC motor, it is difficult to put the stator 1 into practical use. There were problems such as a decrease in magnetic flux and the occurrence of magnetic disturbance.

In order to increase the thrust of the conventional coil movable linear DC motor, the magnetomotive force of the permanent magnet forming the stator 1 or the magnetomotive force of the winding 11 (the product of the number of turns and the current) forming the mover 10 is increased. This is made possible by the increase in In order to increase the thrust by increasing the magnetomotive force of the permanent magnet, the stator 1 must be increased in size and weight.
There were problems such as an increase in leakage magnetic flux and an increase in price. In order to increase the thrust by increasing the magnetomotive force (the product of the number of turns and the current) of the winding 11, the mover 10 must be large and heavy, the stroke must be reduced due to the mover 10 having a large size, and the mover 10 must have a large weight. However, there were problems such as deterioration of responsiveness and increase in thrust fluctuation.

By forming the permanent magnets constituting the stator 1 with rare earth permanent magnets, the magnetic flux Φma and the magnetic flux Φmb increase, so that a long stroke and a large thrust can be easily achieved. However, the leakage flux increases and the stator 1
However, there is a problem that the size and weight are increased.

That is, the conventional coil-movable linear DC motor has a pulsation-free thrust and excellent responsiveness, but has a reduced leakage flux, a longer stroke, a larger thrust, a smaller size, lighter weight and lower cost. There was a problem that it was difficult to make it.

[0013]

The problem to be solved is to realize a reduction in leakage magnetic flux, a long stroke, a large thrust, a small size, a light weight, and a low price of a movable coil type linear DC motor. Is a difficult point.

[0014]

SUMMARY OF THE INVENTION A first constitution of the stator 1 is described below.
The main feature of the present invention is that the yoke 2 is configured to cover the periphery of the movable element 10 and the second yoke 6 through an opening for transmitting thrust acting on the movable element 10 to the outside. It enables the purpose of reducing the leakage magnetic flux, increasing the stroke, increasing the thrust, reducing the size and weight, and reducing the cost of the movable linear DC motor, and further reducing the thrust fluctuation and reducing the size and weight of the mover 10. And responsiveness can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS On the basis of the structural explanatory view of the embodiment of the movable coil type linear DC motor of the present invention shown in FIGS. 1 to 6, and the magnetic flux distribution diagram of the movable coil linear DC motor of the present invention shown in FIG. The structure and operation will be described.

In the first embodiment of the movable coil type linear DC motor of the present invention shown in FIG. 1, the stator 1 has a first yoke 2 having a U-shaped cross section and a second yoke 2 having a flat plate shape. A yoke 6, a first permanent magnet 7 fixed to the end of the first yoke 2 and the second yoke 6 in the direction of arrow B,
And the second permanent magnet 8 fixed to the end of the second yoke 6 in the direction of arrow A.

The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in the space 21 defined by the relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

The first yoke 2 is composed of a first component 3 and a second component 4 having a plane to which the first permanent magnet 7 and the second permanent magnet 8 are fixed, and a mover. It is configured to cover the periphery of the mover 10 and the second yoke 6 via an opening 22 for transmitting the thrust acting on the mover 10 to the outside.

The first permanent magnet 7 has a magnetic pole surface having N polarity fixed to the surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. Yoke 6
The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3. The second permanent magnet 8 has a magnetic pole surface having an N-pole polarity fixed to a surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3.

In the second embodiment of the coil movable linear DC motor of the present invention shown in FIG. 2, the stator 1 includes a first yoke 2 having a U-shaped cross section and a second yoke 2 having a flat plate shape. It comprises a yoke 6 and a first permanent magnet 7 fixed to the end of the first yoke 2 and the second yoke 6 in the direction of arrow B.

The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in the space 21 defined by the relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

The first yoke 2 is composed of a first component 3 and a second component 4 having a plane to which the first permanent magnet 7 is fixed, and applies a thrust acting on the mover 10 to the outside. Is configured to cover the mover 10 and the periphery of the second yoke 6 through an opening 22 for transmitting the movement to the movable member 10.

The first permanent magnet 7 has a magnetic pole surface having N pole fixed to the surface of the first component 3 constituting the first yoke 2 facing the second yoke 6, Yoke 6
The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3.

In the third embodiment of the coil movable linear DC motor according to the present invention shown in FIG. 3, the stator 1 includes a first yoke 2 having a C-shaped cross section and a second yoke 2 having a flat plate shape. A yoke 6, a first permanent magnet 7 fixed to the end of the first yoke 2 and the second yoke 6 in the direction of arrow B,
And the second permanent magnet 8 fixed to the end of the second yoke 6 in the direction of arrow A.

The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in the space 21 defined by the relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

The first yoke 2 is composed of a first component 3 and a second component 4 having a plane to which the first permanent magnet 7 and the second permanent magnet 8 are fixed, and the mover It is configured to cover the periphery of the mover 10 and the second yoke 6 via an opening 22 for transmitting the thrust acting on the mover 10 to the outside.

The first permanent magnet 7 has a magnetic pole surface having N polarity fixed to the surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. Yoke 6
The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3. The second permanent magnet 8 has a magnetic pole surface having an N-pole polarity fixed to a surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3.

In a fourth embodiment of the coil movable linear DC motor of the present invention shown in FIG. 4, the stator 1 includes a first yoke 2 having a C-shaped cross section and a second flat yoke. It comprises a yoke 6 and a first permanent magnet 7 fixed to the end of the first yoke 2 and the second yoke 6 in the direction of arrow B.

The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in the space 21 defined by the relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

The first yoke 2 is composed of a first component 3 and a second component 4 having a plane to which the first permanent magnet 7 is fixed, and applies a thrust acting on the mover 10 to the outside. Is configured to cover the mover 10 and the periphery of the second yoke 6 through an opening 22 for transmitting the movement to the movable member 10.

The first permanent magnet 7 has a magnetic pole surface having N polarity fixed to the surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. Yoke 6
The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3.

The fifth embodiment of the coil movable linear DC motor of the present invention shown in FIG. 5 has a stator 1 and a mover 10 of the first embodiment of the present invention shown in FIG. And are arranged in a coaxial cylindrical shape.

The stator 1 includes a first yoke 2 having a cylindrical shape through an opening 22, a second yoke 6 having a cylindrical shape,
A first permanent magnet 7 fixed to the ends of the first yoke 2 and the second yoke 6 in the direction of arrow B, and a first permanent magnet 7 fixed to the ends of the first yoke 2 and the second yoke 6 in the direction of arrow A. And the second permanent magnet 8 formed.

The mover 10 is wound around the second yoke 6 with a predetermined gap therebetween, and smoothly moves in the space 21 defined by the respective relative surfaces of the first yoke 2 and the second yoke 6. It is constituted by windings 11 arranged in a movable structure.

The first yoke 2 has a semi-cylindrical surface to which the first permanent magnet 7 and the second permanent magnet 8 are fixed.
The opening 2 for transmitting the thrust acting on the mover 10 to the outside is constituted by the constituent member 3 and the second constituent member 4.
It is configured to cover the mover 10 and the second yoke 6 via the second yoke 6.

The first permanent magnet 7 has a magnetic pole surface having N polarity fixed to the surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. Yoke 6
The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3. The second permanent magnet 8 has a magnetic pole surface having an N-pole polarity fixed to a surface of the first component 3 constituting the first yoke 2 facing the second yoke 6. The magnetic pole surface having the polarity of the S pole is fixed to the surface of the first yoke 2 facing the first component member 3.

In the embodiment of the movable coil type linear DC motor according to the present invention shown in FIGS. 1 to 5, a predetermined current is applied to the winding 11 in the direction shown in the drawing, so that the mover 10 is driven by an arrow A with a predetermined thrust. In a direction different from the direction shown in FIG.
Moves in the direction of arrow B with a predetermined thrust.

The thrust acting on the mover 10 of the movable coil type linear DC motor of the present invention shown in FIGS. 1 and 2 is transmitted to the outside from a portion of the mover 10 located in the opening 22, and FIGS. 4 and FIG. 5, the thrust acting on the mover 10 of the coil movable linear DC motor of the present invention is transmitted to the outside through the opening 22.

In the embodiment of the coil movable linear DC motor of the present invention shown in FIGS. 1, 3 and 5, the first component 3 constituting the first yoke 2 is moved relative to the second yoke 6. A first permanent magnet 7 and a second permanent magnet 8
The first component member 3 that fixes the magnetic pole surface having the polarity of the S pole of the first yoke 2 of the second yoke 6
By fixing the magnetic pole surfaces having the N-pole polarity of the first permanent magnet 7 and the second permanent magnet 8 to the surfaces facing each other, the mover 10 The current moves in the direction of arrow B by flowing a current, and a predetermined current flows through the winding 11 in a direction different from the direction shown by the arrow A.
Move in the direction.

In the embodiment of the movable coil type linear DC motor of the present invention shown in FIGS.
And a magnetic pole surface having the polarity of the S pole of the first permanent magnet 7 is fixed to a surface of the first component member 3 that faces the second yoke 6, and the first yoke of the second yoke 6. By fixing a magnetic pole surface having the polarity of the N pole of the first permanent magnet 7 to a surface of the first permanent magnet 7 facing the first component member 3 constituting the movable element 1
Numeral 0 moves in the direction of arrow B by passing a predetermined current through the winding 11 in the illustrated direction, and moves in the direction of arrow A by flowing a predetermined current through the winding 11 in a direction different from that illustrated.

Generally, the embodiment of the coil movable linear DC motor of the present invention shown in FIGS.
It corresponds to a stroke exceeding [mm], and the embodiment of the coil movable linear DC motor of the present invention shown in FIGS. 2 and 4 corresponds to a stroke of 50 [mm] or less.

In the embodiment of the coil movable linear DC motor of the present invention shown in FIG. 5, various linear bearings having a cylindrical shape are fixed to the inner cylindrical surface of the mover 10 so that the mover can be held in the axial direction. Possible, simplifying the bearing device,
It is possible to reduce the size and weight and reduce the price.

In general, the conventional coil-movable linear DC motor shown in FIG. 8 is arranged such that the center of the first yoke 2 or the second yoke 6 in the moving direction of the mover 10 is moved with respect to the moving direction of the mover 10. The cross-sectional area in the direction perpendicular to
Without changing the size of the gap provided between the movable yoke 2 and the gap provided between the mover 10 and the second yoke 6, without changing the cross-sectional area of the other portions. It is possible to improve the responsiveness due to the decrease in the thrust fluctuation and the decrease in the inductance of the winding 11.

Also in the coil movable linear DC motor of the present invention, the center of the first yoke 2 or the second yoke 6 in the moving direction of the mover 10 is perpendicular to the moving direction of the mover 10. The cross-sectional area of the other portions is not changed without changing the size of the gap provided between the mover 10 and the first yoke 2 and the size of the gap provided between the mover 10 and the second yoke 6. , It is possible to improve the responsiveness due to the reduction of the thrust fluctuation and the reduction of the inductance of the winding 11.

FIG. 6 shows an embodiment in which the thrust variation and the responsiveness of the movable coil type linear DC motor of the present invention shown in FIG. 1 can be reduced. In the coil movable linear DC motor of the present invention shown in FIG. 1, by providing a space 23 that penetrates the center of the second yoke 6 in the moving direction of the mover 10, the movable element 10 of the second yoke 6 The cross-sectional area of the central part in the moving direction in the direction perpendicular to the moving direction of the mover 10 is defined by the gap provided between the mover 10 and the first yoke 2 and the space between the mover 10 and the second yoke 6. The cross-sectional area of the other portion is made smaller without changing the size of the gap provided between them.

In general, in the embodiment of the present invention shown in FIGS. 1 to 5, the cross-sectional area of the second yoke 6 in the direction perpendicular to the moving direction of the movable element 10 and the movable element 10 of the first yoke 2 The cross-sectional area in the direction perpendicular to the moving direction is the same, and the diameter or thickness of the second yoke 6 is set to be larger than the diameter or thickness of the first yoke 2.

FIG. 7 is a magnetic flux distribution diagram of the coil movable linear DC motor of the present invention shown in FIG. First yoke 2
The first permanent magnet 7 is provided in a range from the end in the direction of arrow B to the center of the space 21 defined by the respective relative surfaces of the first component 3 and the second yoke 6. The magnetic flux Φmaa that increases in proportion to the magnetomotive force is uniformly distributed in the illustrated direction, and the respective relative surfaces of the first component 3 and the second yoke 6 forming the first yoke 2 are formed. The magnetic flux Φmba that increases in proportion to the magnetomotive force of the second permanent magnet 8 is uniformly distributed in the illustrated direction in the space 21 from the end in the direction of arrow A to the center.

However, the magnetic flux Φmaa and the magnetic flux Φmba
As in the case of the magnetic flux Φma and the magnetic flux Φmb of the conventional coil movable linear DC motor shown in FIG. 8, the magnetic resistance of the first yoke 2 and the second yoke 6 increases when the stroke is increased (the magnetic path length is increased). Due to the increase), the distribution at the center of the space 21 decreases.

The portion of the space 21 defined by the respective relative surfaces of the first yoke 2 and the second yoke 6 extends from the end in the direction of arrow B to the center of the first permanent magnet 7. The magnetic flux Φmab that increases in proportion to the magnetomotive force is uniformly distributed in the illustrated direction, and the portion of the space 21 defined by the respective relative surfaces of the first yoke 2 and the second yoke 6 in the direction of arrow A In the range from the end to the center, the magnetic flux Φmbb that increases in proportion to the magnetomotive force of the second permanent magnet 8 is uniformly distributed in the illustrated direction.

The magnetic flux Φmab is composed of a part of the magnetic flux Φma and a part of the leakage magnetic flux of the conventional coil movable linear DC motor shown in FIG. 8, and the magnetic flux Φmbb is formed by the conventional coil movable linear motor shown in FIG. It is composed of a part of the magnetic flux Φmb of the DC motor and a part of the leakage magnetic flux.

The portion of the space 21 defined by the respective relative surfaces of the third component 3 and the second yoke 6 constituting the first yoke 2 extends from the end in the direction of arrow B to the center. A magnetic flux Φmaa and a magnetic flux Φma
b interlinks, and a portion of the space 21 formed by the respective relative surfaces of the third component 3 and the second yoke 6 constituting the first yoke 2 from the end in the direction of arrow A to the center. The magnetic flux Φmba and the magnetic flux Φmb
b interlinks with each other, and a portion of the space 21 formed by the respective relative surfaces of the fourth component member 4 and the second yoke 6 constituting the first yoke 2 from the end in the direction of arrow B to the central portion. The magnetic flux Φmab interlinks with the winding 11 located in the range of the first yoke 2 to form the fourth component 4 and the second yoke 6.
The magnetic flux Φmbb interlinks with the winding 11 located in the range from the end in the direction of arrow A to the center of the space 21 defined by the respective relative surfaces.

That is, the movable coil type linear DC motor of the present invention can reduce the leakage magnetic flux and increase the thrust of the conventional movable coil type linear DC motor.

The magnetic flux Φma and the magnetic flux Φmb in the space 21 of the conventional coil movable linear DC motor shown in FIG.
As the stroke increases, the magnetic path becomes longer, and the magnetic path decreases from the end of the space 21 toward the center, and the magnetic flux Φm in the space 21 of the coil movable linear DC motor of the present invention is increased.
The magnetic path length of ab and the magnetic flux Φmbb is constant over the entire stroke, and is uniformly distributed in the space 21.

That is, the coil movable linear DC motor of the present invention shown in FIGS. 1 to 5 enables an increase in the magnetic flux in the center of the space 21, enables a long stroke, and reduces a thrust fluctuation.

The coil movable linear DC motor according to the present invention has a first permanent magnet 7 constituting the stator 1 or a first permanent magnet 7 and a second permanent magnet 8 constituting the stator 1.
Are made of rare earth permanent magnets, the effects of reduction of leakage magnetic flux, long stroke, large thrust, reduction of thrust fluctuation, and reduction in size and weight are remarkably exhibited.

In the coil movable linear DC motor of the present invention, the first permanent magnet 7 and the second permanent magnet 8 are provided for the purpose of reducing the cost of the permanent magnet and simplifying the magnetization.
It is configured by arranging or laminating a plurality of permanent magnets.

[0057]

As described above, the coil movable linear DC motor of the present invention can reduce the leakage magnetic flux, increase the stroke, and increase the thrust of the conventional coil movable linear DC motor. With a reduction in leakage magnetic flux, a long stroke, and a large thrust, it is possible to reduce the size, weight, and cost. That is, it is possible to reduce the leakage magnetic flux, increase the stroke length, increase the thrust, reduce the size and weight, and reduce the cost. Furthermore,
This makes it possible to reduce the size and weight of the mover and improve the responsiveness accompanying the increase in thrust, and to expand the linear region of thrust (the region where there is no fluctuation in thrust).

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a first embodiment of the present invention.

FIG. 2 is a structural explanatory view of a second embodiment of the present invention.

FIG. 3 is a structural explanatory view of a third embodiment of the present invention.

FIG. 4 is a structural explanatory view of a fourth embodiment of the present invention.

FIG. 5 is a structural explanatory view of a fifth embodiment of the present invention.

FIG. 6 is a structural explanatory view of a sixth embodiment of the present invention.

FIG. 7 is a magnetic flux distribution diagram of the coil movable linear DC motor of the present invention.

FIG. 8 is a structural explanatory view of a conventional coil movable linear DC motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 1st yoke 3 1st structural member 4 2nd structural member 6 2nd yoke 7 1st permanent magnet 8 2nd permanent magnet 10 Mover 11 Winding 21 Space 22 Opening 23 Space

Claims (2)

[Claims] 1. A first yoke, a second yoke arranged in parallel with the first yoke at a predetermined distance, and a first yoke of one end of the first yoke and the second yoke. A first magnetic pole surface having a predetermined polarity is fixed to a surface of the second yoke facing the second yoke, and a first magnetic pole surface having another polarity is fixed to a surface of the second yoke facing the first yoke. And the other end of the first and second yokes,
A second permanent magnet in which a magnetic pole surface having the same polarity as the first permanent magnet is fixed to a surface of the first yoke facing the second yoke and a surface of the second yoke facing the first yoke. A first stator is wound around a second yoke with a predetermined gap,
A movable coil type linear DC motor, comprising: a movable element composed of a winding arranged in a structure capable of moving smoothly in a space defined by respective relative surfaces of the yoke and the second yoke. A coil-movable linear DC motor, wherein the yoke is configured to cover the periphery of the mover and the second yoke through an opening for transmitting thrust acting on the mover to the outside. 2. A first yoke, a second yoke arranged in parallel with the first yoke at a predetermined distance, and a first yoke of one end of the first yoke and the second yoke. A first magnetic pole surface having a predetermined polarity is fixed to a surface of the second yoke facing the second yoke, and a first magnetic pole surface having another polarity is fixed to a surface of the second yoke facing the first yoke. And a first magnet wound around a second yoke with a predetermined gap therebetween.
A movable coil type linear DC motor, comprising: a movable element composed of a winding arranged in a structure capable of moving smoothly in a space defined by respective relative surfaces of the yoke and the second yoke. A coil-movable linear DC motor, wherein the yoke is configured to cover the periphery of the mover and the second yoke through an opening for transmitting thrust acting on the mover to the outside.