JPH10112967A - Single-pole linear dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the thrust, lessen size and weight, make the stroke long, and lessen a change in the thrust over all the strokes in a single-pole linear DC motor by mounting three windings on a part of a stator. SOLUTION: A stator 1 is constituted of a first constituent member 43 constituted of a first yoke 2, a second constituent member comprising a second yoke 3 and a first permanent magnet 5, second permanent magnets 6a, 6b fixed to both ends of the first and the second constituent member 43, 44, and a second winding 7, a third winding 8, and a fourth winding 9 which are wound around the first constituent member 43, being arranged in line. A movable member 11 is constituted of a first winding 12 wound around the first constituent member 43, the second winding 7, the third winding 8 and the fourth winding 9 at a space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In general, a single-pole type linear DC motor is the only linear motor capable of generating thrust without pulsation, and has excellent responsiveness which enables the weight of the mover to be reduced.・ It is a motor. Servo control by mounting various position detection devices enables wide-range control of thrust and speed and high-precision control of stop position, and requires operation at loads that dislike vibration and thrust fluctuation and wide-range speed. It is the only linear actuator that can handle a changing load. The present invention is used for driving various moving parts that dislike vibration and thrust fluctuation in various OA devices, various optical devices, various measuring devices, and the like, generating thrust without pulsation, reducing the size and weight, increasing the thrust, The present invention relates to a single-pole type linear DC motor capable of increasing the stroke and reducing the variation in thrust for the entire stroke.

[0002]

2. Description of the Related Art The structure and operation of a conventional single-pole linear DC motor will be described with reference to sectional views shown in FIGS. 1 to 3 and thrust characteristic diagrams shown in FIGS.

The conventional single-pole linear DC motor shown in FIG. 1 has a stator 1 forming two closed magnetic paths and a first winding wound around a part of the stator 1 with a predetermined gap. This is a long-stroke single-pole linear DC motor that is constituted by a mover 11 composed of a motor 12 and is capable of generating thrust without pulsation and generating thrust with little fluctuation.

[0004] The stator 1 comprises a magnetic path forming means 41 comprising a first yoke 2 having a flat plate shape, a second yoke 3 having a flat plate shape, and a pair of third yokes 4a and 4b.
Magnetomotive force generating means 42 composed of a plate-shaped first permanent magnet 5 is provided. Third yokes 4a and 4b are provided at both ends of the first yoke 2 and the second yoke 3, respectively. A magnetic pole surface having the polarity of the south pole of the first permanent magnet 5 is fixed to a surface of the second yoke 3 facing the first yoke 2 magnetically and mechanically.

The first yoke 2 constitutes a first component 43, and the second yoke 3 and the first permanent magnet 5 constitute a second component 44. The first constituent member 43 and the second constituent member 44 are arranged at a predetermined distance from each other, and the first closed magnetic path 32 and the second closed magnetic path 33 are formed.

The mover 11 mainly includes a first winding 12 wound around a first constituent member 43 with a predetermined gap therebetween, and moves in a space 21 in directions of arrows A and B. It is arranged in a structure that can move smoothly and freely. By moving a predetermined current through the first winding 12 in the illustrated direction and moving in the direction of arrow A with a predetermined thrust, by flowing a predetermined current through the first winding 12 in a direction different from the illustrated direction, a predetermined current is applied. It moves in the direction of arrow B with thrust.

The conventional single-pole type linear DC motor shown in FIG. 2 has a stator 1 forming two closed magnetic paths, and a first winding wound around a part of the stator 1 with a predetermined gap. This is a long-stroke single-pole linear DC motor which is constituted by a mover 11 comprising a long stroke 12 and can generate thrust without pulsation and at a low cost.

The stator 1 includes a first yoke 2 having a flat plate shape.
A magnetic path forming means 41 formed by a second yoke 3 having a flat plate shape; and a magnetomotive force generating means 42 formed by a pair of second permanent magnets 6a and 6b having a flat plate shape. The pole faces of the second permanent magnets 6a and 6b having N-polarity are fixed to both ends of the surface of the second yoke 2 facing the second yoke 3, respectively, and the first yoke of the second yoke 3 The second permanent magnets 6a and 6
The magnetic pole surfaces having the polarity of the south pole b are respectively fixed.

The first yoke 2 constitutes a first component 43, and the second yoke 3 constitutes a second component 44.
The first component 43 and the second component 44 are arranged at a predetermined distance from each other, and the space 2 defined by the respective relative surfaces
A first closed magnetic path 32 and a second closed magnetic path 33 are formed in the direction shown in FIG.

The mover 11 mainly includes a first winding 12 wound around a second component 44 with a predetermined gap therebetween, and moves in the space 21 in the directions indicated by arrows A and B. It is arranged in a structure that can move smoothly and freely. By moving a predetermined current through the first winding 12 in the illustrated direction and moving in the direction of arrow A with a predetermined thrust, by flowing a predetermined current through the first winding 12 in a direction different from the illustrated direction, a predetermined current is applied. It moves in the direction of arrow B with thrust.

A conventional single-pole linear DC motor shown in FIG. 3 has a stator 1 forming one closed magnetic circuit, and a first winding wound around a part of the stator 1 with a predetermined gap. This is a short-stroke single-pole linear DC motor which is constituted by a mover 11 comprising a pulsator 12 and can generate thrust without pulsation and thrust with little fluctuation.

The stator 1 includes a magnetic path forming means 41 comprising a first yoke 2 having a cylindrical shape, a second yoke 3 having a cylindrical shape, and a third yoke 4 having a disc shape, and a cylindrical member. And a first yoke 2 and a second yoke 3 are provided.
A third yoke 4 is magnetically and mechanically fixed to one end of each of the first yoke 2 and an N face of a first permanent magnet 5 on a surface of the second yoke 3 facing the first yoke 2. The pole face having the polarity of the pole is fixed.

The first yoke 2 constitutes a first component 43, and the second yoke 3 and the first permanent magnet 5 constitute a second component 44. The first component 43 and the second component 44 are coaxially arranged at a predetermined distance from each other, and form the closed magnetic path 31 in the illustrated direction via the space 22 defined by the respective relative surfaces.

The mover 11 mainly includes a first winding 12 wound around a first component 43 with a predetermined gap therebetween, and moves in a space 22 in directions of arrows A and B. It is arranged in a structure that can move smoothly and freely. By moving a predetermined current through the first winding 12 in the illustrated direction and moving in the direction of arrow A with a predetermined thrust, by flowing a predetermined current through the first winding 12 in a direction different from the illustrated direction, a predetermined current is applied. It moves in the direction of arrow B with thrust.

FIG. 4 is a thrust characteristic diagram when the stroke x [mm] of the conventional single-pole linear DC motor shown in FIG. 1 is set to 100 [mm], and FIG. The stroke x [mm] of the single pole linear DC motor
FIG. 6 is a thrust characteristic diagram when set to 00 [mm].
FIG. 4 is a thrust characteristic diagram when the stroke x [mm] of the conventional single-pole linear DC motor shown in FIG. 3 is set to 20 [mm].

In the thrust characteristic diagrams shown in FIGS. 4 to 6, the curve A
[B] shows a thrust characteristic when power of [W] is supplied, a curve B shows a thrust characteristic when power of 20 [W] is supplied to the first winding 12 constituting the mover 11, and a curve C shows Mover 11
Shows the thrust characteristics when 45 [W] power is supplied to the first winding 12 constituting the first winding 12. That is, the curve A represents the first winding 12
Is a thrust characteristic when a current of I [A] is passed through the curve B.
Is a thrust characteristic when a current of 2 × I [A] is applied to the first winding 12, and a curve C is 3 × I [A] applied to the first winding 12.
It is a thrust characteristic when the current of FIG.

The thrust of the conventional single-pole linear DC motor shown in FIGS. 1 and 2 is generated by the magnetic flux flowing through the first closed magnetic path 32 interlinking with the first winding 12 or the thrust. The magnetic flux flowing through the intersecting second closed magnetic path 33, that is, the space 21
, The magnetic field in the range where the first closed magnetic path 32 is formed or the magnetic field in the range where the second closed magnetic path 33 is formed in the space 21, the number of turns of the first winding 12, and the first winding 12 and increases in proportion to the current flowing through the circuit.

The thrust of the conventional single-pole linear DC motor shown in FIG. 3 is generated by the magnetic flux flowing through the closed magnetic path 31 linked to the first winding 12, that is, the closed magnetic path 31 in the space 21 is formed. Magnetic field, the number of turns of the first winding 12 and the first winding 1
2 and increases in proportion to the current flowing through 2.

In general, increasing the thrust of the conventional single-pole linear DC motor involves increasing the magnetic flux linked to the first winding 12, increasing the number of turns of the first winding 12, or increasing the first winding 12. This is made possible by an increase in the current flowing through the However, an increase in magnetic flux linked to the first winding 12 has problems such as an increase in the size, weight, and cost of the stator 1.
The increase in the number of turns has problems such as an increase in the size and weight of the mover 11, a decrease in responsiveness, and a decrease in the stroke. Therefore, it is dealt with by an increase in the current flowing through the first winding 12.

The increase in the current flowing through the first winding 12 constituting the mover 11 increases the gradient of the magnetic field generated around the first winding 12 in the moving direction of the mover 11, and the stator 1
Gives a gradient to the distribution of the magnetic field formed in the space 21 or the space 22, and the thrust characteristic curve B shown in FIGS.
As shown by curve C, there is a problem that the thrust fluctuation for all strokes is increased.

In general, the conventional single-pole type linear DC motor has a long stroke by using the first yoke 2, the second yoke 3 and the third yokes 4, 4a, 4b constituting the magnetic path forming means 41. The first permanent magnet 5 or the second permanent magnet 6 constituting the magnetomotive force generating means 42 is increased in volume.
This is made possible by increasing the volume of a, 6b. However, there are problems such as an increase in the size, weight, and cost of the stator 1 and an increase in leakage magnetic flux. As the leakage magnetic flux increases, the magnetic flux interlinking the first winding 12 decreases. There is a problem that thrust decreases.

[0022]

The problems to be solved are to increase the thrust of the conventional single-pole linear DC motor, to reduce the size and weight, to increase the stroke, and to reduce the thrust fluctuation with respect to the entire stroke. Is difficult to realize together.

[0023]

A second winding is formed on a component of the stator 1 constituting one-third of the space 21 or the space 22 in one end direction of the conventional single-pole linear DC motor. 7 in the center of space 21 or space 22
The third winding 8 is wound around the constituent members of the stator 1 constituting the range of / 3, and the configuration of the stator 1 constituting the range of one third in the direction of the other end of the space 21 or the space 22 4th member
The most important feature of the present invention is that the winding 9 is wound, and the purpose of increasing the thrust, reducing the size and weight, increasing the stroke, and reducing the variation in the thrust with respect to the entire stroke is realized very easily.

[0024]

FIG. 7, FIG. 9, FIG. 11, FIG.
15 and FIGS. 8, 10 and 1.
The structure and operation of the single-pole linear DC motor of the present invention will be described based on the thrust characteristic diagram shown in FIG.

FIG. 7 is a cross-sectional view for explaining the structure of the first embodiment of the single-pole linear DC motor of the present invention.
The single-pole linear DC motor according to the present invention has a movable element 11 comprising a stator 1 forming two closed magnetic paths and a first winding 12 wound around a part of the stator 1 with a predetermined gap. It is composed of

The stator 1 has a magnetic path structuring means 41 comprising a first yoke 2 having a flat plate shape, a second yoke 3 having a flat plate shape, and a pair of third yokes 4a and 4b.
Magnetomotive force generating means 42 composed of a plate-shaped first permanent magnet 5 is provided. Third yokes 4a and 4b are provided at both ends of the first yoke 2 and the second yoke 3, respectively. A magnetic pole surface having the polarity of the south pole of the first permanent magnet 5 is fixed to a surface of the second yoke 3 facing the first yoke 2 magnetically and mechanically.

The first yoke 2 forms a first constituent member 43, and the second yoke 3 and the first permanent magnet 5 form a second constituent member 44. The first constituent member 43 and the second constituent member 44 are arranged at a predetermined distance from each other, and the first closed magnetic path 32 and the second closed magnetic path 33 are formed.

The second winding 7 is wound in a range of 1/3 in the direction of the arrow A corresponding to the moving range of the mover 11 of the first component member 43 constituting the space 21, thereby forming the space 21. The third winding 8 is wound in a 1/3 range of the central portion corresponding to the moving range of the mover 11 of the first component member 43 to be formed. The fourth winding 9 is wound in a range of 1/3 in the direction of the arrow B corresponding to the moving range of the mover 11. The second winding 7 and the third winding 8
The winding specifications of the fourth winding 9 and the fourth winding 9 are the same.

The mover 11 mainly includes a first winding 12 wound around a second component 44 with a predetermined gap therebetween, and moves in the space 21 in the directions of arrows A and B. It is arranged in a structure that can move smoothly and freely.

The mover 11 applies a predetermined current to the first winding 12 in the illustrated direction, and applies the second winding 7, the third winding 8, and the fourth winding 9 to the illustrated direction. By flowing a predetermined current, the magnetic flux flowing through the first closed magnetic path 32 or the magnetic flux flowing through the second closed magnetic path 33, that is, the magnetic field within the range in which the first closed magnetic path 32 is formed in the space 21 or The magnetic field in the range where the second closed magnetic path 33 is formed in the space 21, the number of turns of the first winding 12, and the current flowing through the first winding 12 increase in proportion. Of the winding 7, the third winding 8 and the fourth winding 9, and the current flowing through the second winding 7, the third winding 8 and the fourth winding 9, respectively. It moves in the direction of arrow A with a predetermined thrust that increases in proportion to the first winding 12, the second winding 7, and the third winding.
By passing a predetermined current through the winding 8 and the fourth winding 9 in directions different from those shown in the drawing, the coil moves in the direction of arrow B with a predetermined thrust.

FIG. 8 is a thrust characteristic diagram of the single-pole linear DC motor of the present invention shown in FIG.
The thrust characteristics when [mm] is set to 100 [mm] are shown. Curve B shows a thrust characteristic when a predetermined current is applied only to the first winding 12 constituting the mover 11, and is represented by a curve C in the thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG. It is equivalent.

In the single-pole linear DC motor of the present invention shown in FIG. 7, when a predetermined current is applied to the first winding 12 forming the mover 11, the mover is placed around the first winding 12. A second magnetic field that decreases at a predetermined rate in the moving direction of the movable element 11 is formed, and the first magnetic field that is uniformly formed in the space 21 by the magnetomotive force generating means 42 is reduced as the mover 11 moves. That is, as shown by the curve B in FIG. 8, the thrust acting on the mover 11 decreases as the mover 11 moves.

When a predetermined current is applied to each of the second winding 7, the third winding 8 and the fourth winding 9 in the direction shown in the drawing, the second winding 7, the third winding 8 and A third magnetic field that increases at a predetermined rate in the moving direction of the mover 11 is formed around the fourth winding 9. The third magnetic field is applied to the second winding 7, the third
The number of turns of each of the winding 8 and the fourth winding 9 and the second
, The third winding 8, and the fourth winding 9 respectively.

The reduction ratio of the second magnetic field formed around the first winding 12 constituting the mover 11, the second winding 7, the third winding 8, and the fourth winding 9 The magnitude of the current flowing through the first winding 12 and the magnitude of the current flowing through the second winding 7 and the third winding are controlled so that the increasing rate of the third magnetic field formed around the first winding 12 becomes equal.
When the magnitude of the current flowing through the winding 8 and the fourth winding 9 is set, it is possible to generate a thrust that does not fluctuate with respect to the movement of the mover 11 over the entire stroke as shown by the straight line A in FIG. Become.

FIG. 9 is a sectional view for explaining the structure of a second embodiment of the single-pole linear DC motor of the present invention.
The single-pole linear DC motor according to the present invention has a movable element 11 comprising a stator 1 forming two closed magnetic paths and a first winding 12 wound around a part of the stator 1 with a predetermined gap. It is composed of

The stator 1 includes a first yoke 2 having a flat plate shape.
A magnetic path forming means 41 formed by a second yoke 3 having a flat plate shape; and a magnetomotive force generating means 42 formed by a pair of second permanent magnets 6a and 6b having a flat plate shape. The pole faces of the second permanent magnets 6a and 6b having N-polarity are fixed to both ends of the surface of the second yoke 2 facing the second yoke 3, respectively, and the first yoke of the second yoke 3 The second permanent magnets 6a and 6
The magnetic pole surfaces having the polarity of the south pole b are respectively fixed.

The first yoke 2 forms a first component 43, and the second yoke 3 forms a second component 44.
The first component 43 and the second component 44 are arranged at a predetermined distance from each other, and the space 21 defined by the respective relative surfaces
, A first closed magnetic path 32 and a second closed magnetic path 33 are formed in the illustrated direction.

The second winding 7 is wound in a range of 1/3 in the direction of arrow A corresponding to the moving range of the mover 11 of the first component member 43 forming the space 21, and the space 21 is formed. The third winding 8 is wound in a 1/3 range of the central portion corresponding to the moving range of the mover 11 of the first component member 43 to be formed. The fourth winding 9 is wound in a range of 1/3 in the direction of the arrow B corresponding to the moving range of the mover 11. The second winding 7 and the third winding 8
The winding specifications of the fourth winding 9 and the fourth winding 9 are the same.

The mover 11 mainly includes a first winding 12 wound around a second component member 44 with a predetermined gap therebetween, and moves in the space 21 in the directions of arrows A and B. It is arranged in a structure that can move smoothly and freely.

The mover 11 applies a predetermined current to the first winding 12 in the illustrated direction, and applies a predetermined current to the second winding 7, the third winding 8 and the fourth winding 9 in the illustrated direction. By flowing a predetermined current, the magnetic flux flowing through the first closed magnetic path 32 or the magnetic flux flowing through the second closed magnetic path 33, that is, the magnetic field within the range in which the first closed magnetic path 32 is formed in the space 21 or The magnetic field in the range where the second closed magnetic path 33 is formed in the space 21, the number of turns of the first winding 12, and the current flowing through the first winding 12 increase in proportion. Of the winding 7, the third winding 8 and the fourth winding 9, and the current flowing through the second winding 7, the third winding 8 and the fourth winding 9, respectively. It moves in the direction of arrow A with a predetermined thrust that increases in proportion to the first winding 12, the second winding 7, and the third winding.
By passing a predetermined current through the winding 8 and the fourth winding 9 in directions different from those shown in the drawing, the coil moves in the direction of arrow B with a predetermined thrust.

FIG. 10 is a thrust characteristic diagram of the single-pole linear DC motor of the present invention shown in FIG. 9, and a straight line A shows the thrust characteristic when the stroke x [mm] is set to 100 [mm]. A curve B shows a thrust characteristic when a current is applied only to the first winding 12 constituting the mover 11, and corresponds to a curve C in the thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG. Things.

FIG. 11 is a sectional view for explaining the structure of a third embodiment of the single-pole linear DC motor of the present invention. The single-pole linear DC motor of the present invention includes a movable element 11 comprising a stator 1 forming one closed magnetic circuit, and a first winding 12 wound on a part of the stator 1 with a predetermined gap. It is composed of

The stator 1 comprises a magnetic path forming means 41 comprising a first yoke 2 having a cylindrical shape, a second yoke 3 having a cylindrical shape, and a third yoke 4 having a disc shape, and a cylindrical member. And a first yoke 2 and a second yoke 3 are provided.
A third yoke 4 is magnetically and mechanically fixed to one end of each of the first yoke 2 and an N face of a first permanent magnet 5 on a surface of the second yoke 3 facing the first yoke 2. The pole face having the polarity of the pole is fixed.

The first yoke 2 constitutes a first component 43, and the second yoke 3 and the first permanent magnet 5 constitute a second component 44. The first constituent member 43 and the second constituent member 44 are arranged in a coaxial cylindrical shape at a predetermined distance,
A closed magnetic path 31 is formed in a direction shown in the drawing via a space 22 defined by the respective relative surfaces.

The second winding 7 is mounted in a range of one third in the direction of arrow A corresponding to the range of movement of the mover 11 of the second component member 44 forming the space 22, and forms the space 22. The third winding 8 is mounted in a 1/3 range of the central portion corresponding to the moving range of the mover 11 of the second component 44, and the mover of the second component 44 forming the space 22. The fourth winding 9 is mounted in a 1/3 range of the arrow B direction corresponding to the 11 movement range. The second winding 7 and the third winding 8
The winding specifications of the fourth winding 9 and the fourth winding 9 are the same.

The mover 11 mainly includes a first winding 12 wound around a first component member 43 with a predetermined gap therebetween, and moves in the space 22 in the directions indicated by arrows A and B. It is arranged in a structure that can move smoothly and freely.

The mover 11 allows a predetermined current to flow through the first winding 12 in the direction shown in the figure, and causes the second winding 7, the third winding 8 and the fourth winding 9 to flow in the direction shown in the drawing. By flowing a predetermined current, a magnetic flux flowing through the closed magnetic path 31, that is, a magnetic field in a range where the closed magnetic path 31 is formed in the space 22,
Increases in proportion to the number of turns of the winding 12 and the current flowing through the first winding 12, and further increases the respective windings of the second winding 7, the third winding 8, and the fourth winding 9. The number of turns and the second winding 7,
It moves in the direction of arrow A with a predetermined thrust that increases in proportion to the current flowing through each of the third winding 8 and the fourth winding 9, and the first winding 12, the second winding 7, 3 windings 8
By flowing a predetermined current through the fourth winding 9 in a direction different from that shown in the drawing, the fourth winding 9 moves in the direction of arrow B with a predetermined thrust.

FIG. 12 is a thrust characteristic diagram of the single-pole linear DC motor of the present invention shown in FIG. 11, and a straight line A indicates the thrust characteristic when the stroke x [mm] is set to 20 [mm]. A curve B shows a thrust characteristic when a current is applied only to the first winding 12 constituting the mover 11, and corresponds to a curve C in the thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG. Things.

FIG. 13 is a sectional view for explaining the structure of a fourth embodiment of the single-pole linear DC motor of the present invention. The single-pole linear DC motor according to the present invention has a movable element 11 comprising a stator 1 forming two closed magnetic paths and a first winding 12 wound around a part of the stator 1 with a predetermined gap. It is composed of

The stator 1 has a first yoke 2 having a cylindrical shape.
A magnetic path forming means 41 constituted by a second yoke 3 having a cylindrical shape, and a magnetomotive force generating means 42 constituted by a pair of second permanent magnets 6a and 6b having a cylindrical shape. The pole faces of the second permanent magnets 6a and 6b having N-polarity are respectively fixed to both ends of the surface of the yoke 3 facing the first yoke 2, and the second yoke of the first yoke 2 The second permanent magnets 6a, 6
The magnetic pole surfaces having the polarity of the south pole b are respectively fixed.

The first yoke 2 forms a first component 43, and the second yoke 3 forms a second component 44. The first constituent member 43 and the second constituent member 44 are coaxially arranged at a predetermined distance from each other, and form two closed magnetic paths via the cylindrical space 22 defined by the respective relative surfaces. .

The second winding 7 is wound in a range of １ ／ in the direction of the arrow A corresponding to the moving range of the mover of the second component member 44 forming the space 22, and forms the space 22. Second
The third winding 8 is wound around the center of the movable member of the second member 44 corresponding to the moving range of the movable member of the second member 44, and the movable member of the second member 44 constituting the space 22 is moved. The fourth winding 9 is wound in a range of 1/3 in the direction of the arrow B corresponding to the range. The winding specifications of the second winding 7, the third winding 8, and the fourth winding 9 are configured to be the same.

The mover 11 comprises a second component 44, a second
, A first winding 12 wound around a third winding 8, a third winding 8, and a fourth winding 9 at a predetermined distance from each other. It is arranged in a structure that can move smoothly and freely in the direction of arrow B.

The mover 11 applies a predetermined current to each of the first winding 12, the second winding 7, the third winding 8, and the fourth winding 9 in the direction shown in FIG. Moving in the direction of arrow A with a thrust force, and applying a predetermined current to each of the first winding 12, the second winding 7, the third winding 8 and the fourth winding 9 in a direction different from that shown in the figure. As a result, it moves in the direction of arrow B with a predetermined thrust. The thrust of the mover 11 is controlled by the mover 11 provided at a predetermined position of the first yoke.
Is transmitted to the outside through an opening that can move smoothly and freely throughout the stroke.

FIG. 14 is a sectional view for explaining the structure of a fifth embodiment of the single-pole linear DC motor according to the present invention. The single-pole linear DC motor of the present invention has a structure in which two single-pole linear DC motors of the present invention shown in FIG. 9 are connected in parallel.

The stator 1 has a magnetic path forming means 41 composed of a pair of first yokes 2 and a second yoke 3 having a flat plate shape, and a pair of second permanent magnets having a flat plate shape. Magnetomotive force generating means 42 constituted by magnets 6a and 6b
And a pair of first yokes 2 constitute a first constituent member 43, respectively, and the second yoke 3 is a second constituent member 4
4 is constituted.

The relative surfaces of the second constituent member 44 and the pair of first constituent members 43 form a pair of spaces 21, and the mover of the first constituent member 43 forming one space 21. The second winding 7 is wound in a range of 1/3 in the direction of the arrow A corresponding to the moving range of the moving member, and corresponds to the moving range of the mover of the first component member 43 constituting one space 21. A third winding 8 is wound in a 1/3 range of the central portion, and 1/3 in the direction of arrow B corresponding to the moving range of the mover of the first component member 43 constituting one space 21. The fourth winding 9 is wound in the range. Similarly, the second winding 7, the third winding 8, and the fourth winding 9 are also wound around the first component 43 that forms the other space 21. In addition, a pair of second
, A pair of third windings 8 and a pair of fourth windings 9 have the same winding specifications.

The mover 11 mainly includes a first winding 12 wound around a second component 44 at a predetermined distance from the second component 44. It is arranged in a structure that can move smoothly and freely in the direction.

The mover 11 applies predetermined currents to the first winding 12, the pair of second windings 7, the pair of third windings 8, and the pair of fourth windings 9 in the directions shown in the figure. To move in the direction of arrow A with a predetermined thrust, and the first winding 12, the pair of second windings 7, the pair of third windings 8, and the pair of fourth windings 9 By moving a predetermined current in a direction different from the direction shown in the figure, it moves in the direction of arrow B with a predetermined thrust.

FIG. 15 is a sectional view for explaining the structure of a sixth embodiment of the single-pole linear DC motor of the present invention. The single-pole linear DC motor according to the present invention has a movable element 11 comprising a stator 1 forming two closed magnetic paths and a first winding 12 wound around a part of the stator 1 with a predetermined gap. It is composed of

The stator 1 includes a first yoke 2 having a flat plate shape.
And a magnetic path forming means 41 constituted by a plate-shaped second yoke 3 and a magnetomotive force generating means constituted by a plate-shaped first permanent magnet 5 and a pair of second permanent magnets 6a and 6b. 42, a magnetic pole surface having the polarity of the N pole of the first permanent magnet 5 is fixed to a surface of the second yoke 3 facing the first yoke 2, and the first yoke 3 has a first magnetic pole surface. Second permanent magnets 6a, 6b are provided at both ends of the surface facing the yoke 2.
The magnetic pole surfaces having N poles are fixed to each other.
The pole faces of the second permanent magnets 6a and 6b having the polarity of the S pole are fixed to both ends of the surface of the yoke 2 facing the second yoke 3, respectively.

The first yoke 2 forms a first component 43, and the second yoke 3 forms a second component 44. The first component 43 and the second component 44 are arranged at a predetermined distance from each other, and form two closed magnetic paths via the space 21 defined by the respective relative surfaces.

The second winding 7 is wound in a range of の in the direction of the arrow A corresponding to the moving range of the mover of the first constituent member 43 constituting the space 21, and forms the space 21. First
The third winding 8 is wound around the central part of the movable member of the first member 43 corresponding to the moving range of the movable member of the first member 43, and the movable member of the first member 43 constituting the space 21 is moved. The fourth winding 9 is wound in a range of 1/3 in the direction of the arrow B corresponding to the range. The winding specifications of the second winding 7, the third winding 8, and the fourth winding 9 are configured to be the same.

The mover 11 includes a first component 43 and a second
, A first winding 12 wound around a third winding 8, a third winding 8 and a fourth winding 9 at a predetermined distance from each other. It is arranged in a structure that can move smoothly and freely in the direction of arrow B.

The mover 11 applies a predetermined current to the first winding 12, the second winding 7, the third winding 8, and the fourth winding 9 in the directions shown in FIG. Moving in the direction of arrow A with a thrust force, and applying a predetermined current to each of the first winding 12, the second winding 7, the third winding 8 and the fourth winding 9 in a direction different from that shown in the figure. As a result, it moves in the direction of arrow B with a predetermined thrust.

The single-pole linear DC motor according to the present invention is designed to enable the conventional single-pole linear DC motor to have a larger thrust, a smaller size and a lighter weight, a longer stroke, and a reduced thrust variation over the entire stroke. The first component 43 or the second component 44 constituting the moving range of the mover 11 has the second winding 7, the second winding 7 having the same winding number, the winding resistance and the same size as the second winding 7, The third winding 8 and the fourth winding 9 are wound, and operation is performed by supplying the same current to each winding.

However, the winding specification of the second winding 7 or the magnitude of the flowing current, the winding specification of the third winding 8 or the magnitude of the flowing current, the winding specification of the fourth winding 9 or By changing the magnitude of the flowing current, it is possible to easily set the thrust characteristics according to the purpose of use.

Normally, the single-pole type linear DC motor of the present invention has a second winding 7, a third winding 8, and a fourth winding 9 each having the same winding specification and connected in parallel. Connected and operated by supplying power from the same power source,
1 and the second winding 7, the third winding 8, and the fourth winding 9 are connected in parallel, so that power can be supplied from a single power supply. Thus, the servo operation of the single-pole linear DC motor of the present invention is facilitated, and the cost of the servo control circuit can be reduced.

The first permanent magnet 5 or the second permanent magnets 6a and 6b constituting the stator 1 of the single-pole linear DC motor of the present invention are provided in plural for the purpose of cost reduction and simplification of assembly. The permanent magnets 6a and 6b are formed by laminating permanent magnets and magnetic materials.

The second winding 7, the third winding 8 and the fourth winding 9 of the single-pole type linear DC motor of the present invention have a long winding.
In order to improve the stroke or to reduce the thrust fluctuation, a plurality of windings are connected in parallel, and the first winding 12 constituting the mover 11 is used for reducing the size and weight. Has a bobbin-less structure by a self-bonding wire.

[0071]

As described above, the increase in the thrust of the single-pole linear DC motor of the present invention is achieved by the first
By increasing the current of the winding 12, it is possible to reduce the size of the mover 11 and reduce the weight of the mover 11 as the current increases, and the stroke increases with the decrease in the size of the mover 11. There is an effect that responsiveness is improved with the weight reduction of 11.
Further, there is an effect that the stator 1 can be reduced in size and weight with the increase in the thrust. When the thrust and the mass of the armature are set to be the same as those of the conventional single-pole linear DC motor, the mass of the entire conventional single-pole linear DC motor can be reduced to about 1/3 to 1/6.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conventional single-pole linear DC motor.

FIG. 2 is a cross-sectional view of a conventional single-pole linear DC motor.

FIG. 3 is a cross-sectional view of a conventional single-pole linear DC motor.

FIG. 4 is a thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG.

FIG. 5 is a thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG.

FIG. 6 is a thrust characteristic diagram of the conventional single-pole linear DC motor shown in FIG.

FIG. 7 is a sectional view of a first embodiment of a single-pole linear DC motor according to the present invention.

FIG. 8 is a thrust characteristic diagram of the first embodiment of the single-pole linear DC motor of the present invention.

FIG. 9 is a sectional view of a single-pole linear DC motor according to a second embodiment of the present invention.

FIG. 10 is a thrust characteristic diagram of a second embodiment of the single-pole linear DC motor of the present invention.

FIG. 11 is a sectional view of a third embodiment of the single-pole linear DC motor of the present invention.

FIG. 12 is a thrust characteristic diagram of a third embodiment of the single-pole linear DC motor of the present invention.

FIG. 13 is a sectional view of a single-pole linear DC motor according to a fourth embodiment of the present invention.

FIG. 14 is a sectional view of a fifth embodiment of the single-pole linear DC motor of the present invention.

FIG. 15 is a sectional view of a sixth embodiment of the single-pole linear DC motor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 1st yoke 3 2nd yoke 4 3rd yoke 4a 3rd yoke 4b 3rd yoke 5 1st permanent magnet 6a 2nd permanent magnet 6b 2nd permanent magnet 7 2nd Winding 8 third winding 9 fourth winding 11 mover 12 first winding 21 space 22 space 31 closed magnetic path 32 first closed magnetic path 33 second closed magnetic path 41 magnetic path forming means 42 magnetomotive force Generating means 43 First component 44 Second component

Claims (2)

[Claims] 1. A magnetic head comprising a magnetic path forming means and a magnetomotive force generating means, wherein respective relative surfaces of a first structural member and a second structural member which are arranged at a predetermined distance from each other are configured. A stator that forms two closed magnetic paths via a space, and a first coil that is wound with a predetermined gap around either one of the first component or the second component that forms the space.
And a mover having a structure capable of moving smoothly in the space, in a single-pole linear DC motor, wherein the first component or the second component constituting the space is A single-pole linear DC motor, wherein a second winding, a third winding, and a fourth winding are wound around a range corresponding to a moving range of one of the movers. 2. A magnetic head comprising a magnetic path forming means and a magnetomotive force generating means, wherein respective first and second constituent members which are arranged at a predetermined distance from each other constitute respective relative surfaces. A stator that forms one closed magnetic path through a space, and a first coil that is wound around a first component or a second component that constitutes the space with a predetermined gap therebetween.
And a mover having a structure capable of moving smoothly in the space, in a single-pole linear DC motor, wherein the first component or the second component constituting the space is A single-pole linear DC motor, wherein a second winding, a third winding, and a fourth winding are wound around a range corresponding to a moving range of one of the movers.