JPH09201030A - Linear motor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the production cost of a linear motor and, at the same time, to reduce the size of the motor by reducing the number of parts by making magnetic encoder unnecessary. SOLUTION: The mover 5 of a linear motor 1 has a mover base section 9 formed in a box-like shape a cavity section 9A which is loosely put on the yoke tooth section 3C of a stator 3 is formed in the section 9 and, at the same time, a voice coil 11 is wound around the outer peripheral surface of a side wall forming the cavity section 9A. A conductor 17 for supplying magnetic sensor current which is electrically connected to a magnetic sensor 13 for detecting the intensity of a leakage magnetic field from the magnetic field magnet 7 of the stator section 3 on one end side is electrically connected to the section 9 on the other end side. The conductor 17 is used for supplying an electric current to the sensor 13 from the outside and, at the same time, the one end section of the conductor 17 is coated with the side wall 9B of the base section 9 and the other end section is coated with an insulating coating member 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor for adjusting the angle of a fender mirror mounted on a vehicle, for example, and more specifically to a linear motor suitable for detecting the position of a mover by the magnetic flux leakage of a magnetic circuit. The manufacturing method is related.

[0002]

2. Description of the Related Art For example, a fender mirror mounted on a vehicle has its angle changed in response to a predetermined operation by a driver sitting in a driver's seat, and a field of view behind the vehicle reflected on the fender mirror. Is configured to be adjustable. When the angle is changed, the fender mirror is operated linearly, so that the use of a linear motor is generally popular rather than a rotary motor or an electromagnetic solenoid. As such a linear motor, as shown in FIGS. 4 and 5, JP-A-60-156256.
A voice coil type linear motor 100 having a magnetic encoder described in Japanese Patent Publication is known.

As can be understood from FIGS. 4 and 5, the voice coil type linear motor 100 is a moving coil type voice coil type linear motor, in which a yoke 102 having a U-shaped cross section is formed of an iron plate or the like. The magnetic path is configured to be closed by attaching the plate-shaped magnetic body 104 at the opening end. In addition, both side walls 10 of the yoke 104
A pair of plate-shaped magnetic field magnets 106 and 108 are provided on the inner surfaces of 2A and 102B with their N poles facing each other. A stator yoke 110 is provided on both side walls 102A and 102B at opposite positions of both side walls 102A and 102B. , 102B are vertically provided on the yoke 102 in the protruding direction.

A hollow cylindrical bobbin 112 having a hollow interior is loosely fitted in the stator yoke 110. The bobbin 112 is guided by the stator yoke 110 and extends in the longitudinal direction of the stator yoke 110. It is supposed to be movable. A drive coil 114 is wound around the outer peripheral side surface of the bobbin 110, and the drive coil 114 is molded with a resin 116. By supplying a current from the external current source to the drive coil 114, the drive coil 11 is
4 is moved in the length direction of the stator yoke 110 within the magnetic field formed by the field magnets 106 and 108.

A magnetic encoder magnetic pole portion 118 formed by alternately magnetizing N and S poles is provided on one side surface in the height direction of the field magnet 108, and faces the magnetic pole portion 118. A magnetic sensor 120 is provided at the position of the resin 116 that operates. Further, the field magnet 10
6, a magnetic sensor 122 is provided at a position of the resin 116 facing one side surface in the height direction, and in this magnetic sensor 122, an origin signal magnetizing portion provided at one end position of the field magnet 106 in the longitudinal direction. A signal is detected from (the magnet for indicating the reference position) 124. The drive coil 114 (bobbin 112) is based on the detection signal (signal indicating the reference position) of the magnetic sensor 122 and the signal detected by the magnetic encoder mainly including the magnetic sensor 120 and the magnetic pole portion 118. ) On the stator yoke 110 is determined.

[0006]

However, in the configuration in which the magnetic encoder magnetic pole portion 118, the magnetic sensor 122, and the like are provided, the number of parts is large, so that the manufacturing cost is high and the manufacturing work is complicated, and therefore the manufacturing efficiency is high. Is not good and it is difficult to reduce the size.

It is an object of the present invention to provide a linear motor which does not require a magnetic encoder, reduces the number of parts, reduces the production cost, and can be downsized. Another object of the present invention is to provide a method of manufacturing a linear motor which can improve the working efficiency as well as the manufacturing efficiency of the linear motor that does not require a magnetic encoder.

[0008]

In order to achieve the above object, a linear motor according to the present invention comprises a wall-shaped yoke tooth portion projecting from one side surface in the thickness direction of a plate-shaped yoke base portion in the same direction, A stator portion having magnetic field magnets respectively fixed to side surface portions of the yoke tooth portions facing each other of the yoke tooth portions of the yoke tooth portion, and a movable portion movable in both directions along the yoke tooth portion protruding direction. And a magnetic field formed by the magnetic field magnet, wherein the movable element is formed with a cavity for loosely fitting the yoke tooth portion located in the center of the yoke tooth portion. A cylindrical insulating mover base around which a voice coil for receiving a current supplied from an external current source to generate a force for moving the mover is wound around the outer peripheral side surface, and the magnetic field of the magnetic field magnet is The magnetic sensor for detecting the strength of the leakage magnetic field leaking from the tooth portion is electrically connected to and held at one end position, and the other end is fixed to the mover base, and the external current source supplies the magnetic field. A magnetic sensor current supply conductor for supplying a current to the magnetic sensor, and an insulating coating member for coating a part or all of the magnetic sensor current supply conductor along the longitudinal direction.

Further, a portion of the magnetic sensor current supply conductor, which is separated from the magnetic sensor connection portion by a desired length, is desired in a direction in which the magnetic sensor is held at a position where the strength detection output of the leakage magnetic field becomes larger. Characterized by being bent at an angle.

An arm portion extending along the bent shape of the magnetic sensor current supply conductor is formed on the movable element base portion, and an engaging recess or engaging protrusion is integrally formed on the arm portion. An engaging projection or an engaging recess integrally formed with the covering member corresponding to the engaging recess or the engaging projection of the arm, and the arm corresponding to the engaging recess or the engaging projection of the covering member The holding position of the magnetic sensor is positioned and held by engaging the engaging protrusions or the engaging recesses with each other.

Further, the magnetic sensor current supply conductor is bent at an angle of about 90 degrees, and the magnetic sensor is held at a position facing the voice coil. Further, the bent portion of the current supply conductor is formed thick.

In order to achieve the above-mentioned other object, a method of manufacturing a linear motor according to the present invention comprises a wall-shaped yoke tooth portion projecting from one side surface in the thickness direction of a plate-shaped yoke base portion in the same direction, and Movable in both directions along the yoke tooth protruding direction with respect to a stator portion having yoke magnetic portions located at both ends of the yoke tooth portion and having magnetic field magnets fixed respectively to opposite side surface portions. A method for manufacturing a linear motor including a child, wherein a voice coil for generating a force for moving the mover within a magnetic field formed by the magnetic field magnet is wound around an outer peripheral side surface of the mover base, and the yoke is provided. The first step of forming a hollow portion in which the yoke tooth portion located in the center of the tooth portion is loosely fitted, and the strength of the leakage magnetic field leaking the magnetic field of the magnetic field magnet from the yoke tooth portion are detected. The air sensor is electrically connected to one end position and can be held, and the other end has a magnetic sensor current supply conductor electrically connected to an external current source for supplying current to the magnetic sensor. A second step of fixing to the mover base, and a third step of coating a part or all of the magnetic sensor current supply conductor along the longitudinal direction with an insulating coating member, the first step, The second step and the third step are performed simultaneously.

Further, the first step, the second step and the third step
After the steps are performed at the same time, the magnetic sensor is held at a position where the magnetic sensor current supply conductor is separated from the magnetic sensor connection part by a desired length so that the strength detection output of the leakage magnetic field becomes larger. It is characterized by being bent at a desired angle in any direction.

The angle at which the magnetic sensor current supply conductor is bent is set to about 90 degrees, and the magnetic sensor electrically connected to the magnetic sensor current supply conductor is wound around the voice coil. It is characterized in that it is held in a posture opposed to.

Further, the first step, the second step and the third step
In the step, an arm extending along the bent shape of the magnetic sensor current supply conductor is formed on the mover base,
An engaging recess or an engaging projection is formed integrally with the arm portion,
The step of integrally forming the engaging projection or the engaging recess corresponding to the engaging recess or the engaging projection of the arm portion on the covering member is simultaneously performed, and in the bending step of the magnetic sensor current supply conductor, The holding position of the magnetic sensor is positioned by engaging the engaging projections or the engaging recesses of the arm portions corresponding to the engaging recesses or the engaging projections of the covering member with each other. .

Further, the magnetic sensor current supply conductor is bent after the magnetic sensor is electrically connected to the magnetic sensor current supply conductor.

Further, the magnetic sensor is electrically connected to the magnetic sensor current supply conductor after the magnetic sensor current supply conductor is bent.

Therefore, in the linear motor according to the first aspect, the conventionally used magnetic encoder becomes unnecessary, and the number of parts is reduced.

Further, in the linear motor according to the second aspect, since the magnetic sensor current supply conductor is bent, the magnetic sensor detects the leakage magnetic field at a more appropriate position.

Further, in the linear motor according to the third aspect, the engaging projections or the engaging recesses of the arm portions corresponding to the engaging recesses or the engaging projections of the covering member are engaged with each other, whereby Positioning of the magnetic sensor holding position is performed.

Further, in the linear motor according to the fourth aspect, the magnetic sensor current supply conductor is bent at an angle of approximately 90 degrees to hold the magnetic sensor at a position facing the voice coil. .

Further, in the linear motor according to the fifth aspect, since the bent portion of the current supply conductor is formed thick, the strength of the bent portion is improved.

In the method of manufacturing a linear motor according to the sixth aspect, the first step, the second step and the third step are performed simultaneously.

In the method of manufacturing a linear motor according to the seventh aspect, a portion of the magnetic sensor current supply conductor, which is separated from the magnetic sensor connection portion by a desired length, has a greater strength magnetic field detection output of the leakage magnetic field. Since it is bent at a desired angle in the direction in which the magnetic sensor is held at the position where it becomes larger,
The leakage magnetic field can be detected by the magnetic sensor at a more appropriate position.

In the method of manufacturing the linear motor according to the eighth aspect, the magnetic sensor current supply conductor is bent at an angle of approximately 90 degrees, so that it is electrically connected to the magnetic sensor current supply conductor. The magnetic sensor is held in a posture facing the wound voice coil.

Further, in the method of manufacturing a linear motor according to the ninth aspect, in the bending step of the magnetic sensor current supply conductor, the arm portion corresponding to the engaging concave portion or the engaging protrusion of the covering member is formed. The engagement protrusions or the engagement recesses are engaged with each other, whereby the position where the magnetic sensor is held is positioned.

In the method of manufacturing a linear motor according to the tenth aspect, the magnetic sensor current supply conductor is bent after the magnetic sensor is electrically connected to the magnetic sensor current supply conductor. .

Further, in the method of manufacturing a linear motor according to the eleventh aspect, the magnetic sensor is electrically connected to the magnetic sensor current supply conductor after the magnetic sensor current supply conductor is bent. .

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a linear motor according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the linear motor 1 includes a stator portion 3 and a mover 5, and the stator portion 3 includes a plate-shaped yoke base portion 3A.
And three wall-shaped yoke tooth portions 3B formed integrally with the yoke base portion 3A by protruding from one side surface of the yoke base portion 3A,
3B and 3C. The two yoke tooth portions 3B, 3B formed at both end positions of the yoke base portion 3A have side surfaces facing each other (side surface portions facing the yoke tooth portion 3C formed at the central position). Plate-shaped magnetic field magnets 7 having a length substantially equal to that of the yoke tooth portions 3B and 3B and a width shorter than the protruding length of the yoke tooth portions 3B and 3B are fixed by an adhesive or the like. The magnetic field magnets 7, 7 have the same magnetic pole (for example, N pole and N pole) facing each other.

On the other hand, as shown in FIG. 1 and FIG. 2 which is a sectional view taken along the line I--I of FIG. 1, the mover 5 is formed in a box shape (cylindrical shape) from an insulating material such as synthetic resin. It has a mover base 9, and one end of the mover base 9 in the axial direction is closed. Further, the other end is opened, and a cavity 9A into which the yoke tooth 3C of the stator 3 is loosely fitted is formed on the side of the opening end, and the outer peripheral side surface of the side wall forming the cavity 9A is formed. A voice coil 11 is wound around. The voice coil 11 is supplied with a current flowing in a predetermined direction from an external current source (not shown), and the mover base 9 (mover 5) moves in both directions (arrow PQ direction) along the protruding direction of the yoke tooth portion 3C. The force to move is generated.

The mover 5 includes magnetic field magnets 7, 7
Magnetic field (hereinafter, magnetic flux leaking from the yoke tooth portions 3B, 3B, 3C to the outside of the stator portion 3) from
Magnetic sensor 13 for detecting the strength of a leakage magnetic field)
Are electrically connected to one end. The other end is electrically connected to the connector 15 provided on the mover base 9,
It has a pair of magnetic sensor current supply conductors 17, 17 through which a current is conducted from an external current source (not shown) through the connector 15 and supplied to the magnetic sensor 13. The magnetic sensor current supply conductors 17, 17 are fixed to the side wall 9B by being covered with the side wall 9B (covering member) forming the closed end of the mover base 9 on the connector 15 side. A portion of the current supply conductors 17, 17 connected to the magnetic sensor 13 is provided with an insulating coating member 19 such as synthetic resin.
Coated with In this case, the magnetic sensor current supply conductors 17, 17 may be entirely covered with an insulating coating member.

Further, the magnetic sensor current supply conductors 17, 1
Reference numeral 7 indicates the bent portion 1 so that the magnetic sensor 13 is held by the magnetic sensor current supply conductors 17, 17 at a position where the strength detection output of the leakage magnetic field in the magnetic sensor 13 becomes larger.
7A is bent. As a result, the portions of the magnetic sensor current supply conductors 17, 17 extending from the connection side of the magnetic sensor 13 to the desired length are in the posture of being close to the voice coil 11.
It is held close to 1.

In this case, the magnetic sensor current supply conductor 1
The bending angle of 7 and 17 is set to 90 degrees, and the magnetic sensor 1
A configuration in which the detection output of the magnetic sensor 13 is further increased by making 3 face the voice coil 11 substantially in parallel is also preferable.

Further, since the bent portion 17A is formed thick, it is possible to avoid inconveniences such as breakage of the magnetic sensor current supply conductors 17, 17 due to bending and to improve the durability of the linear motor 1. And the structure which improves reliability is also suitable.

Next, as shown in FIGS. 1, 2 and 3 (showing the state before the magnetic sensor current supply conductors 17, 17 are bent), a pair of magnetic sensor 13 is provided. The electrodes 13A, 13A are inserted into the mounting holes 19A, 17B, 17B formed through the covering member 19 and the magnetic sensor current supply conductors 17, 17 respectively, and the insertion ends are fixed by the solder 21 or the like. , Magnetic sensor 13
Are fixed to the magnetic sensor current supply conductors 17, 17.

On the side wall 9B of the mover base 9, an arm 23 extending in the direction of the voice coil 11 along the bent shape of the magnetic sensor current supply conductor 17 is integrally formed with the mover base 9. An engaging recess 23A is formed in the side surface of the arm portion 23 that faces the magnetic sensor current supply conductor 17 when the magnetic sensor current supply conductor 17 is bent. The covering protrusions 19B are integrally formed on the covering member 19 so as to correspond to the engaging recesses 23A, and the engaging recesses 23A and the engaging protrusions 19B are engaged with each other, whereby the magnetic sensor 13 is released. The holding position of is positioned. In addition, a configuration in which the engagement recess is formed in the covering member 19 and the engagement projection is formed in the arm 23 is also preferable.

In the linear motor 1 constructed as described above, a current is supplied to the voice coil 11 with the yoke tooth portion 3C of the stator portion 3 loosely fitted in the cavity portion 9A of the mover base portion 9. Then, the mover 5 is moved in the arrow PQ direction in FIG. 1 with the yoke tooth portion 3C serving as a guide. Therefore, for example, by adopting the structure in which the mechanism for changing the angle of the fender mirror provided in the vehicle is connected to the mover 5, the angle of the fender mirror can be adjusted as the mover 5 moves. In this case, since the magnetic field intensity is detected by the magnetic sensor 13, the magnetic flux intensity distribution from the magnetic field magnets 7 is detected based on the detection output signal. As a result, it becomes possible to detect the speed of the mover 5 and the position with respect to the yoke tooth portion 3C, and the fender mirror can be adjusted based on the detection.

The leakage magnetic flux intensity distribution from the magnetic field magnets 7, 7 is the magnetic sensor 13 when the magnetic sensor 13 is located at the origin, for example, when the protruding end of the yoke tooth portion 3C is the origin. When the magnetic field strength calculated from the output is, for example, 1640 gauss, the magnetic sensor 13 is separated from its origin in the protruding direction of the yoke tooth portion 3C by 2 mm, 4 mm, 6 mm, and 8 mm. To 800 gauss, 450 gauss, 280 gauss, and 200 gauss, respectively.

The output of the magnetic sensor 13 is, for example, 11
From the origin of 80 Gauss, the magnetic sensor 13 moves toward the base of the yoke tooth portion 3C by 2 mm, 4 mm,
The distances of 6 mm and 8 mm are changed to 1500 gauss, 1580 gauss, 1500 gauss, and 1180 gauss, respectively. Therefore, it is possible to control the position of the mover 5 based on the changes in the magnetic field strength.

As described above, in the present embodiment, since the magnetic encoder conventionally used in the linear motor 1 is not required and the number of parts is reduced, the manufacturing cost can be reduced and the linear motor can be miniaturized. It will be possible.

Further, the magnetic sensor current supply conductors 17, 1
Since 7 is bent, the magnetic field sensor 13 detects the leaked magnetic field at a more appropriate position. As a result, the detection output of the magnetic sensor 13 becomes good and the reliability of the linear motor 1 is improved.

Further, since the engaging projection 19B of the covering member 19 and the engaging recess 23A of the arm portion 23 are engaged with each other, the holding position of the magnetic sensor 13 is positioned,
As a result of the easy positioning work, the efficiency of the manufacturing work is improved.

Further, the magnetic sensor current supply conductors 17, 1
7 is bent at an angle of approximately 90 degrees, and the magnetic sensor 13 is held at a position facing the voice coil 11, the detection output of the magnetic sensor 13 is further improved, and the reliability of the linear motor 1 is further improved. It

Further, since the bent portions 17A, 17A of the current supply conductors 17, 17 are formed thick, the strength of the bent portions 17A, 17A is improved, and the durability and reliability of the linear motor 1 are improved. Is improved.

Next, a preferred embodiment of a method of manufacturing a linear motor according to the present invention will be described with reference to the drawings. As described in the above embodiment, the linear motor 1 described in the present embodiment has the stator portion 3 and the mover 5, and the stator portion 3 is made of a magnetic material formed by a molding die ( The yoke base portion 3A and the three yoke tooth portions 3B, 3B, 3C are integrally molded by molding (not shown) or the like, and the magnetic field magnets 7, 7 are formed on the inner surfaces of the two yoke tooth portions 3B, 3B facing each other.
Are fixed by an adhesive or the like. The yoke base 3
A: A method in which the three yoke tooth portions 3B, 3B and 3C are separately formed and assembled is also possible.

Next, in manufacturing the mover 5, as shown in FIG.
As shown in FIGS. 2 and 3, first, magnetic sensor current supply conductors 17, 17 are arranged in a molding die (not shown) in an unfolded state as shown in FIG. Is filled with synthetic resin and cured. As a result, in the first step in which the mover base 9 and the cavity 9A are formed, the magnetic sensor current supply conductors 17, 17 are moved to the mover base 9 (side wall 9).
The second step of being fixed to B) and being covered with the covering member 19 and the step of forming the arm portion 23 are simultaneously performed. In this case, the magnetic sensor current supply conductors 17, 17
Attachment holes 17B and 17B, through which the electrodes 13A and 13A of the magnetic sensor 13 are inserted, are preliminarily formed therethrough. Further, the covering member 19 includes electrodes 13A of the magnetic sensor 13,
Mounting holes 19A, 19A through which 13A is inserted and an engaging projection 21B are simultaneously formed, and an engaging recess 23A of the arm portion 23 is also simultaneously formed. Further, the voice coil 11 is wound around the outer peripheral side surface of the cured mover base 9, and the connector 15 is attached thereto. Since the magnetic sensor current supply conductors 17 and 17 are bent in a later step, the shape of the portion in which the arm portion 23 is formed inside the molding die is the same as that of the magnetic sensor current supply conductors 17 and 17. It is designed in a shape that corresponds to the bending shape (folding angle).

In the next step, the electrode 13 of the magnetic sensor 13 is
A and 13A are inserted into the mounting holes 17B and 19A, respectively, and the solder 21 is fused to the insertion ends, so that the magnetic sensor 13 supplies the magnetic sensor current supply conductor 17,
It is attached and fixed to 17.

Then, in the next step, the magnetic sensor current supply conductors 17, 17 are bent at the bent portions 17A, 17A (the state shown in FIG. 2), and the engaging projections 19B of the covering member 19 and the arm portions. The engaging recess 23A of 23 is engaged with each other (the engaging protrusion 19B is press-fitted into the engaging recess 23A). As a result, the magnetic sensor 13 is held at a position where the strength detection output of the leakage magnetic field of the magnetic field magnets 7, 7 becomes larger.

In this case, the magnetic sensor current supply conductor 1
By setting the bending angle of 90 to 90 degrees, the magnetic sensor 13 is held in a posture facing the voice coil 11, and the strength detection output of the leakage magnetic field of the magnetic field magnets 7 by the magnetic sensor 13 is further increased. A configuration in which the magnetic sensor 13 is held at the position is also suitable. The magnetic sensor 13 may be fixed to the magnetic sensor current supply conductors 17, 17 after the magnetic sensor current supply conductors 17, 17 are bent.

As described above, in this embodiment, the first step, the second step, and the third step are simultaneously performed, so that the efficiency of the manufacturing work is improved. Further, since the magnetic sensor current supply conductors 17 and 17 are bent at a desired angle in a direction in which the magnetic sensor 13 is held at a position where the strength detection output of the leakage magnetic field becomes larger, the detection of the leakage magnetic field by the magnetic sensor 13 is performed. Can be performed at a more appropriate position. As a result, the detection output of the magnetic sensor becomes good, and
The reliability of the linear motor 1 is improved.

Further, the magnetic sensor current supply conductors 17, 1
Due to the configuration in which 7 is bent at an angle of approximately 90 degrees, the magnetic sensor 13 electrically connected to the magnetic sensor current supply conductor 17 is held in a posture facing the voice coil 11. As a result, the detection output of the magnetic sensor 13 is further improved,
The reliability of the linear motor 1 is further improved.

Further, the magnetic sensor current supply conductors 17, 1
In the bending step of 7, the engagement protrusion 19B of the covering member 19 and the engagement recess 23A of the arm portion 23 are engaged with each other, so that the magnetic sensor 13 is positioned at an appropriate position. Easily done. As a result, the efficiency of the whole manufacturing work is improved and the linear motor 1
Reliability is improved. Further, it is also possible that an engaging recess is formed in the covering member 19 and an engaging protrusion is formed correspondingly to the arm 23, and the engaging recess and the engaging protrusion are engaged with each other. Also in this case, since the magnetic sensor 13 is positioned at an appropriate position, the positioning work is easily performed, the efficiency of the manufacturing work is improved, and the reliability of the linear motor 1 is improved.

Further, since the magnetic sensor current supply conductors 17 and 17 are bent after the magnetic sensor 13 is electrically connected to the magnetic sensor current supply conductors 17 and 17, the work space for mounting the magnetic sensor 13 is reduced. Since it becomes wider, the work becomes easier and the efficiency of the whole manufacturing work can be improved.

Further, the magnetic sensor current supply conductor 17,
After 17 is bent, the magnetic sensor is electrically connected to the 13 magnetic sensor current supply conductors 17 and 17, so that when there is an inconvenience such as impact on the magnetic sensor 13 during bending work, Work can be performed without impairing the reliability of the sensor 13.

[0055]

As described above, in the linear motor and the manufacturing method thereof according to the present invention, in the linear motor according to the first aspect, the magnetic encoder which has been conventionally used is not necessary and the number of parts is reduced. The manufacturing cost can be reduced, and the linear motor can be downsized.

In the linear motor according to the second aspect of the invention, since the magnetic sensor current supply conductor is bent, the magnetic sensor detects the leaked magnetic field at a more appropriate position. The detection output is good,
The reliability of the linear motor is improved.

Further, in the linear motor according to the third aspect of the invention, the engaging protrusions or engaging recesses of the arms corresponding to the engaging recesses or engaging protrusions of the covering member are engaged with each other, whereby the magnetic sensor Since the holding position is positioned,
As a result of the easier positioning work, the efficiency of the overall manufacturing work is improved.

Further, in the linear motor according to the fourth aspect, the magnetic sensor current supply conductor is bent at an angle of approximately 90 degrees and the magnetic sensor is held at a position facing the voice coil. Detection output is further improved, and the reliability of the linear motor is further improved.

Further, in the linear motor according to the fifth aspect, since the bent portion of the current supply conductor is formed thick, the strength of the bent portion is improved, resulting in durability of the linear motor. And reliability is improved.

In the method of manufacturing a linear motor according to the sixth aspect of the present invention, since the first step, the second step and the third step are performed at the same time, the manufacturing work efficiency is improved.

Further, in the method of manufacturing a linear motor according to the above-mentioned claim 7, the portion of the conductor for supplying magnetic sensor current, which is separated from the connecting portion of the magnetic sensor by a desired length, is at a position where the strength detection output of the leakage magnetic field becomes larger. Since the magnetic sensor is bent by a desired angle in the direction in which the magnetic sensor is held, the magnetic field can be detected at a more appropriate position by the magnetic sensor. Therefore, the detection output of the magnetic sensor becomes good, and the reliability of the linear motor is improved.

Further, in the method of manufacturing a linear motor according to claim 8, the magnetic sensor current supply conductor has an angle of approximately 9 °.
Since the magnetic sensor is bent at 0 degrees, the magnetic sensor electrically connected to the magnetic sensor current supply conductor is held in a position facing the voice coil wound around it. Therefore, the detection output of the magnetic sensor is further improved, and the reliability of the linear motor is further improved.

Further, in the method of manufacturing a linear motor according to claim 9, in the bending step of the magnetic sensor current supply conductor, the engaging projection of the arm portion corresponding to the engaging recess or the engaging projection of the covering member. Alternatively, since the engaging recesses are engaged with each other, the position where the magnetic sensor is held is positioned, so that the positioning work is easily performed. Therefore, the efficiency of the whole manufacturing operation is improved.

In the method of manufacturing a linear motor according to the tenth aspect of the invention, the magnetic sensor current supply conductor is bent after the magnetic sensor is electrically connected to the magnetic sensor current supply conductor. The work space for mounting the sensor becomes wider. Therefore, the work is facilitated and the efficiency of the whole manufacturing work can be improved.

Further, in the method of manufacturing a linear motor according to the eleventh aspect, since the magnetic sensor is electrically connected to the magnetic sensor current supplying conductor after the magnetic sensor current supplying conductor is bent, the folding is performed. When there is an inconvenience such as a shock being applied to the magnetic sensor during bending work, the work can be performed without impairing the reliability of the magnetic sensor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an overall schematic configuration in a preferred embodiment of a linear motor according to the present invention.

FIG. 2 is a cross-sectional view taken along line I-I showing the structure of the mover in FIG.

FIG. 3 is an explanatory view showing a manufacturing state of a mover in a preferred embodiment of the method of manufacturing a linear motor according to the present invention.

FIG. 4 is a schematic configuration diagram showing a conventional linear motor.

5 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 linear motor 3 stator part 3A yoke base parts 3B, 3C yoke tooth part 5 mover 7 magnetic field magnet 9 mover base part 9A cavity part 9B side wall (cover member) 11 voice coil 13 magnetic sensor 15 connector 17 magnetic sensor current supply conductor 17A Bent part 19 Cover member 19B Engagement protrusion 21 Solder 23 Arm part 23A Engagement recess

Claims (11)

[Claims] 1. A wall-shaped yoke tooth portion projecting from one side surface in the thickness direction of a plate-shaped yoke base portion in the same direction, and side surfaces of the yoke tooth portions, which are located at both ends of the yoke tooth portion, face each other. A linear motor comprising: a stator portion having magnetic field magnets fixed to respective portions; and a mover movable in both directions along a protruding direction of the yoke tooth portion, wherein the mover is the yoke. A cavity is formed in which the yoke tooth located in the center of the tooth is loosely fitted, and
A tubular insulating mover base around which a voice coil for receiving a current supplied from an external current source in the magnetic field formed by the magnetic field magnet and generating a force for moving the mover is wound around the outer peripheral side surface; A magnetic sensor for detecting the strength of a leakage magnetic field in which the magnetic field of the magnetic field magnet leaks from the yoke tooth portion is electrically connected and held at one end position, and the other end portion is fixed to the mover base portion, A magnetic sensor current supply conductor to which a current is supplied from an external current source to the magnetic sensor; and an insulating coating member that covers a part or all of the magnetic sensor current supply conductor along the longitudinal direction. Characteristic linear motor. 2. A portion of the magnetic sensor current supply conductor, which is separated from the magnetic sensor connection portion by a desired length, is desired in a direction in which the magnetic sensor is held at a position where the strength detection output of the leakage magnetic field becomes larger. The linear motor according to claim 1, wherein the linear motor is bent at an angle. 3. An arm portion extending along the bent shape of the magnetic sensor current supply conductor is formed on the mover base, and an engaging recess or an engaging projection is integrally formed on the arm portion. An engaging projection or an engaging recess is integrally formed with the covering member in correspondence with the engaging recess or the engaging projection of the arm portion,
The holding position of the magnetic sensor is positioned and held by engaging the engaging projections or the engaging recesses of the arm portions corresponding to the engaging recesses or the engaging projections of the covering member with each other. The linear motor according to claim 1 or 2. 4. The magnetic sensor current supply conductor is bent at an angle of about 90 degrees, and the magnetic sensor is held at a position facing the voice coil. The linear motor according to item 3. 5. The bent portion of the current supply conductor is formed thick.
Linear motor described in. 6. A wall-shaped yoke tooth portion projecting from one side surface in the thickness direction of a plate-shaped yoke base portion in the same direction, and side surface portions of the yoke tooth portion where the yoke tooth portions located at both ends face each other. A method of manufacturing a linear motor 1 comprising a stator having a magnetic field magnet fixed to each of the magnetic field magnets, and a mover movable in both directions along the protruding direction of the yoke teeth. Of the yoke tooth portions, the yoke tooth portion located at the center is loosely fitted to the mover base portion around which the voice coil that generates the force for moving the mover in the magnetic field formed by the magnet is wound around the outer peripheral side surface. A first step of forming a cavity, and a magnetic sensor for detecting the strength of a leakage magnetic field leaking the magnetic field of the magnetic field magnet from the yoke tooth portion is electrically connected and held at one end position. A second step of fixing a magnetic sensor current supply conductor to the other end of the mover base, the conductor being electrically connected to an external current source for supplying current to the magnetic sensor, and the magnetic sensor current supply A linear motor 1 comprising a third step in which a part or all of the conductor along the longitudinal direction is covered with an insulating covering member, and the first step, the second step and the third step are performed simultaneously. Manufacturing method. 7. After the first step, the second step and the third step are performed at the same time, a portion of the magnetic sensor current supply conductor, which is separated from the magnetic sensor connection portion by a desired length, has a leakage magnetic field. 7. The method for manufacturing the linear motor 1 according to claim 6, wherein the magnetic sensor is bent at a desired angle at a position where the strength detection output becomes larger, at a desired angle. 8. A voice coil in which the magnetic sensor current supply conductor is bent at an angle of about 90 degrees, and the magnetic sensor electrically connected to the magnetic sensor current supply conductor is wound. 8. The linear motor 1 according to claim 6 or 7, wherein the linear motor 1 is held in a position facing the linear motor.
Manufacturing method. 9. In the first step, the second step and the third step, an arm portion extending along the bent shape of the magnetic sensor current supply conductor is formed in the mover base portion, and the arm portion is formed. The step of integrally forming the engaging recess or the engaging projection on the portion, and integrally forming the engaging projection or the engaging recess on the covering member corresponding to the engaging recess or the engaging projection of the arm portion. In the bending step of the magnetic sensor current supply conductor, the engaging projections or the engaging recesses of the arm portion corresponding to the engaging recesses or the engaging projections of the covering member are engaged with each other, The method for manufacturing the linear motor 1 according to claim 7, wherein the holding position of the magnetic sensor is positioned. 10. The magnetic sensor current supply conductor is bent after the magnetic sensor is electrically connected to the magnetic sensor current supply conductor.
Alternatively, the method of manufacturing the linear motor 1 according to Item 9. 11. The magnetic sensor current supply conductor is bent, and then the magnetic sensor is electrically connected to the magnetic sensor current supply conductor.
8. The method for manufacturing the linear motor 1 according to 8 or 9.