JPWO2020110592A1 - Motor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor unit capable of securing a repulsive force while miniaturizing a magnetic force generating means.
SOLUTION: Moving side magnets 24A and 24B and fixed side magnets 6A and 6B are magnetically partitioned and magnetic poles are opposite to each other in adjacent sections, so that magnetic field lines are applied to the end faces of the magnets. It can be concentrated, and even when the magnets are miniaturized, the repulsive force between the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B can be secured.
[Selection diagram] Fig. 2

Description

The present invention relates to a motor unit including a moving unit, a driving means, a magnetic force generating means, and an accommodating means.

In general, in a device that causes a moving portion to perform a predetermined motion, a means (for example, a damper) for applying a force to the moving portion may be provided in order to reverse the direction of movement or stop the movement. As a means for applying a force to the moving portion in this way, a magnetic spring structure for a resonance motor has been proposed (see, for example, Patent Document 1). In the magnetic spring structure described in Patent Document 1, magnets are fixed to both ends of the housing (accommodating means), and magnets (moving portions) arranged inside the housing slide and repel each other. Power is being generated.

Japanese Unexamined Patent Publication No. 2011-508579

In the configuration in which the moving portion is accommodated in the accommodating means as described in Patent Document 1, the accommodating space is limited, and therefore it has been desired to reduce the size of the accommodating magnet. However, when the magnets are miniaturized (particularly, the dimensions in the opposite directions of the magnets are reduced), the magnetic flux density in the vicinity of the end faces facing the other magnets tends to decrease, and it is difficult to obtain a large repulsive force. That is, it has been difficult to achieve both miniaturization of the magnetic force generating means for generating a magnetic force (repulsive force) and securing of the repulsive force.

An object of the present invention is to provide a motor unit capable of securing a repulsive force while reducing the size of the magnetic force generating means.

The motion unit of the present invention accommodates a moving portion, a driving means for causing the moving portion to perform a predetermined motion, a magnetic force generating means for generating a magnetic force, and the moving portion, the driving means, and the magnetic force generating means. A motion unit including means, wherein the magnetic force generating means has a moving side magnet provided in the moving portion and a fixed side magnet fixed to the accommodating means, and also has the moving side. A repulsive force is generated between the magnet and the fixed-side magnet, and the moving-side magnet and the fixed-side magnet each have a plurality of sections magnetically partitioned in a direction intersecting each other and intersecting with each other. It is characterized in that the magnetic poles are opposite to each other in the adjacent sections.

According to the present invention as described above, since the magnetic poles of the moving side magnets are opposite to each other in the adjacent sections, the magnetic field lines are directed from one section to the adjacent sections on the end face of the moving side magnets. Is extended. The magnetic field lines extend in the fixed-side magnet as well as in the moving-side magnet. On the other hand, in the case of a magnet that is not magnetically partitioned, a magnetic field line extends from one end face of the magnet toward the other end face. That is, according to the present invention, the number of magnetic field lines along the side surface of the magnet can be reduced, and the magnetic field lines can be concentrated on the end face of the magnet. As a result, even when the magnet is miniaturized, the magnetic flux density at the end face of the magnet can be increased, and the repulsive force between the moving side magnet and the fixed side magnet can be secured. The plurality of magnetically partitioned sections of the moving side magnet and the fixed side magnet may be formed by combining a plurality of physically separated magnets, respectively, or when magnetizing one member. It may be formed by partitioning the magnetized region.

The motion unit of the present invention accommodates a moving portion, a driving means for causing the moving portion to perform a predetermined motion, a magnetic force generating means for generating a magnetic force, and the moving portion, the driving means, and the magnetic force generating means. A motion unit including means, wherein the magnetic force generating means has a moving side magnet provided in the moving portion and a fixed side magnet fixed to the accommodating means, and also has the moving side. A repulsive force is generated between the magnet and the fixed-side magnet, and the moving-side magnet and the fixed-side magnet are magnetically partitioned into three or more odd sections in a predetermined direction intersecting the opposite directions. At the same time, the sections whose magnetic pole directions are along the opposite directions are sandwiched between the two sections whose magnetic pole directions are along the intersecting directions, so that the Halbach arrangement is obtained.

According to the present invention as described above, since the moving side magnets are magnetically partitioned and arranged in a Halbach array, in the section of the end faces facing the fixed side magnets, the magnetic pole direction is along the opposite direction. The lines of magnetic force can be concentrated. Similarly, in the fixed side magnet, the magnetic field lines can be concentrated in the section of the end face facing the moving side magnet in which the magnetic pole direction is along the opposite direction. As a result, even when the magnet is miniaturized, the magnetic flux density on one end surface of the magnet can be increased, and the repulsive force between the moving side magnet and the fixed side magnet can be secured. On the other hand, the magnetic flux density of the end face of the fixed side magnet opposite to the end face facing the moving side magnet becomes small, and the magnetic flux leaking from the accommodating means can be reduced. The plurality of magnetically partitioned sections of the moving side magnet and the fixed side magnet may be formed by combining a plurality of physically separated magnets, respectively, or when magnetizing one member. It may be formed by partitioning the magnetized region.

Further, in the motor unit of the present invention, it is preferable that the moving side magnet and the fixed side magnet are composed of a samarium cobalt magnet. According to such a configuration, even when a samarium-cobalt magnet having a weaker magnetic force than a neodymium magnet or the like is used, the repulsive force between the magnets can be secured as described above. Further, if the accommodating means is miniaturized, the temperature of the magnetic force generating means tends to rise, and if the magnet is miniaturized in the magnetic pole direction, the permit coefficient decreases, but by using a samarium-cobalt magnet having a relatively high Curie temperature, the heat is reduced. Since it is less likely to be magnetized, it is possible to suppress a decrease in the repulsive force due to heat.

Further, in the motion unit of the present invention, the moving portion is a vibrator capable of vibrating in a predetermined vibration direction, the driving means has a coil and a driving magnet, and the moving magnet is the moving magnet. It is preferable that the fixed-side magnets are arranged at both ends of the vibrator in the vibration direction and are arranged at positions that sandwich the vibrator in the vibration direction. According to such a configuration, a repulsive force can be generated when the direction of movement of the vibrator is reversed.

According to the motor unit of the present invention, since the moving side magnet and the fixed side magnet are magnetically partitioned, it is possible to secure the repulsive force while reducing the size of the magnetic force generating means.

It is an exploded perspective view which shows the motor unit which concerns on 1st Embodiment of this invention. It is a top view which shows the said motor unit. It is a top view which shows the moving part of the motor unit. It is a top view which shows the magnetic force generating means of the motor unit. It is a top view which shows typically the magnetic field vector in the said motor unit. It is a top view which shows typically the magnetic field vector in the motor unit of Comparative Example 1. It is a top view which shows typically the magnetic field vector in the motor unit of the comparative example 2. It is a graph which shows the spring constant of the magnetic force generating means in the motor unit of 1st Embodiment. It is a graph which shows the spring constant of the magnetic force generating means in the motor unit of the comparative example 1. FIG. It is a top view which shows the motor unit which concerns on 2nd Embodiment of this invention. It is a top view which shows the magnetic force generating means of the motor unit. It is a top view which shows typically the magnetic field vector in the said motor unit. It is a side view which shows the magnet in the motor unit of the modification of this invention. It is a side view which shows the magnet in the motor unit of another modification of this invention.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those described in the first embodiment and the components having the same functions are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[First Embodiment]
As shown in FIG. 1, the motion unit 1A of the present embodiment includes a vibrator 2 as a moving portion, two shafts 3A and 3B, a coil 4, a case 5 as a housing means, and two fixed sides. A linear vibration actuator including magnets 6A and 6B and a flexible printed substrate (FPC) 7, which is mounted on a mobile terminal such as a smartphone to generate vibration. The motion unit 1A is formed in a rectangular parallelepiped shape in which the vibration direction of the vibrator 2 is the longitudinal direction. In the following, the vibration direction is the X direction, the width direction is the Y direction, and the height direction is the Z direction.

As shown in FIG. 2, the oscillator 2 includes a frame body 21, driving magnets 22A to 22C, a yoke 23, and two moving side magnets 24A and 24B.

The frame 21 is formed in a rectangular plate shape along the XY plane with the X direction as the longitudinal direction, and has a rectangular parallelepiped accommodating portion 211. The frame body 21 has holding portions 212 having a semicircular cross section at its four corners.

The driving magnets 22A to 22C are arranged in the X direction and housed in the housing portion 211 of the frame body 21. At this time, the driving magnets 22A to 22C are arranged so as to have the magnetizing direction of the Halbach array as shown in FIG. That is, the north pole of the drive magnet 22A is directed to the upper side in the Z direction (the side on which the coil 4 is placed), the north pole of the drive magnet 22B is directed to the drive magnet 22A side in the X direction, and the drive magnet 22C. The north pole of is directed downward in the Z direction.

With such a Halbach array, the magnetic flux upward in the Z direction is concentrated on the upper side of the drive magnet 22A, and the magnetic flux downward in the Z direction is concentrated on the upper side of the drive magnet 22C. The number of driving magnets and the magnetizing direction are not limited to those described above, and any configuration may be used as long as a Lorentz force in the X direction is generated when a current is passed through the coil.

The yoke 23 is formed in a rectangular plate shape along the XY plane by a ferromagnetic material such as iron, and is fixed to the lower side of the frame 21 in the Z direction (opposite to the coil 4). By adjusting the weight of the yoke 23, the weight of the entire oscillator 2 may be adjusted (that is, the yoke 23 may be used as a weight), or the yoke may be omitted.

The two moving side magnets 24A and 24B are composed of samarium-cobalt magnets and are arranged at both ends in the X direction.

The shafts 3A and 3B are rod-shaped members having a circular cross section extending along the X direction, and are configured separately from the case 5. The two shafts 3A and 3B are arranged so as to sandwich the oscillator 2 from the Y direction.

The four holding portions 212 of the vibrator 2 hold the shafts 3A and 3B slidably. That is, the shafts 3A and 3B are positioned inside the concave holding portion 212. The holding portion 212 of the vibrator 2 slidably holds the shafts 3A and 3B on both sides in the Y direction, so that the vibrator 2 is guided to move in the X direction by the shafts 3A and 3B.

The coil 4 is arranged on the flexible printed circuit board (FPC) 7. The FPC 7 is formed in a plate shape along an XY plane, is immovably fixed to the case 5, and has a power supply unit 71 that projects to the outside of the case 5 to supply electric power.

The oscillator 2 is arranged so as to face the coil 4 in the Z direction. The coil 4 has a pair of first extending portions 41 and 42 extending along the X direction and a pair of second extending portions 43 and 44 extending along the Y direction, and is substantially rectangular. It is formed in a shape. The pair of first extending portions 41, 42 are arranged on both sides in the Y direction with respect to the driving magnets 22A to 22C when viewed from the Z direction. Further, when viewed from the Z direction, the second extending portion 43 is arranged so as to overlap the driving magnet 22A, and the second extending portion 44 is arranged so as to overlap the driving magnet 22C.

When power is supplied to the coil 4, Lorentz along the X direction is caused by the interaction between the current flowing through the second extending portions 43 and 44 and the magnetic field in the vicinity thereof (around the driving magnets 22A and 22C). Power is generated. As a result, a driving force along the X direction is applied to the vibrator 2. That is, the coil 4 and the driving magnets 22A to 22C function as driving means for driving the vibrator 2. At this time, if a voltage is applied to the coil 4 so that an energizing current having a frequency corresponding to the resonance frequency of the vibrator 2 flows, the vibrator 2 can be driven with high efficiency.

When the vibrator 2 moves in the X direction, a large Lorentz force can be obtained in a range where the second extending portions 43 and 44 and the driving magnets 22A and 22C overlap each other when viewed from the Z direction. Therefore, the stroke length of the vibrator 2 changes depending on the positional relationship between the second extending portions 43 and 44 and the driving magnets 22A and 22C.

The case 5 has a frame-shaped case body 51, a lower lid 52 extending along the XY plane and closing the lower opening of the case body 51, and an upper lid 53 extending along the XY plane and closing the upper opening of the case body 51. And, and are formed in a rectangular parallelepiped shape with the X direction as the longitudinal direction. The case 5 houses the oscillator 2, the shafts 3A and 3B, the coil 4, the fixed-side magnets 6A and 6B, and the FPC 7.

The walls 511 and 512 on both sides of the case body 51 in the X direction are formed with holding holes 510 through which the ends of the shafts 3A and 3B are inserted. As a result, the shafts 3A and 3B are supported by the case 5 so as to extend along the X direction.

The fixed-side magnet 6A is composed of a samarium-cobalt magnet and is fixed between two holding holes 510 in the wall 511 of the case body 51 and on the inner surface side. Further, the fixed side magnet 6B is fixed between two holding holes 510 in the wall 512 of the case main body 51 and on the inner surface side.

Next, the detailed structures of the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B will be described with reference to FIG. The moving side magnet 24A and the moving side magnet 24B have the same configuration, and the fixed side magnet 6A and the fixed side magnet 6B have the same configuration. Therefore, the configurations of the moving side magnet 24A and the fixed side magnet 6A will be described below, and the description of the moving side magnet 24B and the fixed side magnet 6B will be omitted.

The entire moving side magnet 24A is formed in a rectangular shape with each side along the X, Y, and Z directions, and the first magnetic section A1 and the second magnetic section A2 magnetically partitioned in the Y direction. And have. That is, the division screen between the first magnetic section A1 and the second magnetic section A2 is along the ZX plane.

In the first magnetic section A1, the north pole faces the inside (driving magnets 22A to 22C side), and the south pole faces the outside (fixed side magnet 6A side). On the other hand, in the second magnetic section A2, the north pole faces outward and the south pole faces inward. That is, the magnetic poles of the first magnetic section A1 and the second magnetic section A2 adjacent to each other in the Y direction are opposite to each other. The first magnetic section A1 and the second magnetic section A2 may be formed by combining two physically separated magnets, or the magnetizing region may be partitioned when one member is magnetized. The first magnetic section A1 and the second magnetic section A2 may be formed by the above.

The entire fixed-side magnet 6A is formed in a rectangular parallelepiped shape in which each side is along the X, Y, and Z directions, and the first magnetic section B1 and the second magnetic section B2 are magnetically partitioned in the Y direction. And have. That is, the block screen between the first magnetic section B1 and the second magnetic section B2 is along the ZX plane.

In the first magnetic section B1, the north pole faces the outside (wall 511 side) and the south pole faces the inside (moving side magnet 24A side). On the other hand, in the second magnetic section B2, the north pole faces inward and the south pole faces outward. That is, the magnetic poles of the first magnetic section B1 and the second magnetic section B2 adjacent to each other in the Y direction are opposite to each other. The first magnetic section B1 and the second magnetic section B2 may be formed by combining two physically separated magnets, or the magnetizing region may be partitioned when one member is magnetized. The first magnetic section B1 and the second magnetic section B2 may be formed by the above.

The first magnetic section A1 of the moving side magnet 24A and the first magnetic section B1 of the fixed side magnet 6A face each other in the X direction, and the second magnetic section A2 of the moving side magnet 24A and the second magnetic section B2 of the fixed side magnet 6A Are facing each other in the X direction. That is, the same poles of the moving side magnet 24A and the fixed side magnet 6A face each other, and a repulsive force is generated. In this way, the moving side magnet 24A and the fixed side magnet 6A function as magnetic force generating means for generating a magnetic force (repulsive force). Further, the magnetic force generating means arranged on both sides in the X direction also functions as a magnetic urging means by generating an urging force for moving the vibrator 2 toward the vibration center.

Here, the magnetic field lines (magnetic field vector) around the moving side magnet 24A and the fixed side magnet 6A will be described with reference to FIG. In the moving side magnet 24A, since the S pole of the first magnetic section A1 and the N pole of the second magnetic section A2 both face outward and are adjacent to each other in the Y direction, from the N pole of the second magnetic section A2. A magnetic field line is drawn so as to go toward the S pole of the first magnetic section A1. That is, the magnetic field lines are concentrated on the outer end surface of the moving side magnet 24A, and the magnetic flux density is increased. Similarly, the magnetic field lines are concentrated on the inner end surface of the moving side magnet 24A, and the magnetic flux density is increased.

On the other hand, in the fixed-side magnet 6A, the S pole of the first magnetic section B1 and the N pole of the second magnetic section B2 both face inward and are adjacent to each other in the Y direction. A magnetic field line is drawn from the pole toward the S pole of the first magnetic section B1. That is, the magnetic field lines are concentrated on the inner end surface of the fixed-side magnet 6A, and the magnetic flux density is increased. Similarly, the magnetic field lines are concentrated on the outer end surface of the fixed-side magnet 6A, and the magnetic flux density is increased.

On the other hand, as Comparative Example 1, a magnetic field line (magnetic field vector) when a moving side magnet 100 and a fixed side magnet 101 that are not magnetically partitioned will be described with reference to FIG. The moving side magnet 100 is arranged so that the north pole faces outward and the south pole faces inward. The fixed-side magnet 101 is arranged so that the south pole faces outward and the north pole faces inward. In the moving side magnet 100, a magnetic field line is drawn so as to go from the outer N pole to the inner S pole. In the fixed side magnet 101, a magnetic field line is drawn so as to go from the inner N pole to the outer S pole.

That is, in Comparative Example 1, the lines of magnetic force extending from the outer end surface of the moving side magnet 100 and the inner end surface of the fixed side magnet 101 proceed along the side surface of each magnet and head toward the opposite end surface. As described above, the magnetic field lines are less likely to be concentrated on the outer end surface of the moving side magnet 100 and the inner end surface of the fixed side magnet 101.

Further, as Comparative Example 2, a magnetic field line (magnetic field vector) when a moving side magnet 102 and a fixed side magnet 103 that are not magnetically partitioned will be described with reference to FIG. 7. The moving side magnet 102 is the moving side magnet 100 of Comparative Example 1 formed thicker in the X direction, and the fixed side magnet 103 is the fixed side magnet 101 of Comparative Example 1 formed thicker in the X direction.

In Comparative Example 2, as in Comparative Example 1, the lines of magnetic force extending from the outer end face of the moving side magnet 102 and the inner end face of the fixed side magnet 103 travel along the side surface of each magnet and head toward the opposite end face. , The magnetic field lines are less likely to concentrate on the outer end surface of the moving side magnet 102 and the inner end surface of the fixed side magnet 103.

However, in Comparative Example 2, since each magnet is formed thicker in the X direction, the magnetic flux density on the outer end face of the moving side magnet 102 and the inner end face of the fixed side magnet 103 is higher than that of Comparative Example 1. That is, as the moving side magnet and the fixed side magnet are miniaturized in the X direction, the magnetic flux density at the opposite end faces decreases, and it becomes difficult to obtain a repulsive force.

The spring constant of the magnetic force generating means in the present embodiment is shown in the graph of FIG. 8, and the spring constant of the magnetic force generating means in Comparative Example 1 is shown in the graph of FIG. The spring constant is the repulsive force generated between the magnets divided by the unit length. Further, the amplitudes in FIGS. 8 and 9 correspond to the position of the vibrator 2, and the case where the vibrator 2 is arranged at the center of vibration is set to 0, and the moving side magnet approaches the fixed side magnet. It is assumed that the value becomes large.

In the present embodiment in which the moving side magnet 24A and the fixed side magnet 6A are magnetically partitioned, the spring constant is larger (that is, the repulsive force is larger) than in Comparative Example 1 in which the moving side magnet 24A and the fixed side magnet 6A are magnetically partitioned. In particular, when the amplitude becomes large, the difference between these spring constants becomes large.

According to this embodiment, there are the following effects. That is, the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B are magnetically partitioned and the magnetic poles are opposite to each other in the adjacent sections, so that the magnetic field lines are concentrated on the end faces of the magnets. Therefore, even when the magnet is miniaturized, the repulsive force between the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B can be secured.

Further, since the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B are magnetically partitioned, each section can be formed into an elongated shape with the X direction, which is the magnetic pole direction, as the longitudinal direction. Therefore, the permeance coefficient can be increased to prevent thermal demagnetization.

Further, since the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B are composed of samarium cobalt magnets, even when a samarium cobalt magnet having a weaker magnetic force than a neodymium magnet or the like is used, the above As described above, the repulsive force between the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B can be secured. Further, if the case 5 as the accommodating means is miniaturized, the temperature of the magnetic force generating means tends to rise, and if the magnet is miniaturized in the magnetic pole direction, the permit coefficient decreases, but a samarium-cobalt magnet having a relatively high Curie temperature should be used. Therefore, it is possible to make it difficult to be demagnetized by heat.

Further, since the motor unit 1A is a linear vibration actuator that vibrates the vibrator 2, the repulsive force is generated when the moving direction of the vibrator 2 is reversed by the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B. Can be generated.

[Second Embodiment]
In the motor unit 1B of the present embodiment, as shown in FIG. 10, the moving side magnets 24A and 24B of the moving unit 1A of the first embodiment are replaced with the moving side magnets 24C and 24D, and the fixed side magnets 6A and 6B are fixed. It is replaced with side magnets 6C and 6D.

The detailed structures of the moving side magnets 24C and 24D and the fixed side magnets 6C and 6D will be described below with reference to FIG. The moving side magnet 24C and the moving side magnet 24D have the same configuration, and the fixed side magnet 6C and the fixed side magnet 6D have the same configuration. Therefore, the configurations of the moving side magnet 24C and the fixed side magnet 6C will be described below, and the description of the moving side magnet 24D and the fixed side magnet 6D will be omitted.

The entire moving side magnet 24C is formed in a rectangular shape with each side along the X, Y, and Z directions, and includes a first magnetic section C1 and a second magnetic section magnetically partitioned in the Y direction. C2 has a third magnetic section C3. That is, the ward screen between the first magnetic section C1 and the second magnetic section C2 and the ward screen between the second magnetic section C2 and the third magnetic section C3 are along the ZX plane, respectively. ..

In the first magnetic section C1, the north pole faces the second magnetic section C2 side in the Y direction, and the south pole faces the opposite side. In the second magnetic section C2, the north pole faces the outside (fixed side magnet 6C side) in the X direction, and the south pole faces the inside (driving magnets 22A to 22C). In the third magnetic section C3, the north pole faces the second magnetic section C2 side in the Y direction, and the south pole faces the opposite side.

That is, the second magnetic section C2 whose magnetic pole direction is the X direction is sandwiched between the first magnetic section C1 and the third magnetic section C3 whose magnetic pole direction is the Y direction, and the moving side magnets 24C are arranged in a Halbach array. ing. The first magnetic section C1, the second magnetic section C2, and the third magnetic section C3 may be formed by combining three physically separated magnets, or the magnets may be attached when one member is magnetized. The first magnetic section C1, the second magnetic section C2, and the third magnetic section C3 may be formed by partitioning the magnetic region.

The entire fixed-side magnet 6C is formed in a rectangular shape with each side along the X, Y, and Z directions, and includes a first magnetic section D1 and a second magnetic section magnetically partitioned in the Y direction. D2 has a third magnetic section D3. That is, the ward screen between the first magnetic section D1 and the second magnetic section D2 and the ward screen between the second magnetic section D2 and the third magnetic section D3 are along the ZX plane, respectively. ..

In the first magnetic section D1, the north pole faces the second magnetic section D2 side in the Y direction, and the south pole faces the opposite side. In the second magnetic section D2, the north pole faces the inside (moving side magnet 24C side) in the X direction, and the south pole faces the outside (wall 511 side). In the third magnetic section D3, the north pole faces the second magnetic section D2 side in the Y direction, and the south pole faces the opposite side.

That is, the second magnetic section D2 whose magnetic pole direction is the X direction is sandwiched between the first magnetic section D1 and the third magnetic section D3 whose magnetic pole direction is the Y direction, and the fixed side magnets 6C are arranged in a Halbach array. ing. The first magnetic section D1, the second magnetic section D2, and the third magnetic section D3 may be formed by combining three physically separated magnets, or the magnets may be attached when one member is magnetized. The first magnetic section D1, the second magnetic section D2, and the third magnetic section D3 may be formed by partitioning the magnetic region.

The second magnetic section C2 of the moving side magnet 24C and the second magnetic section D2 of the fixed side magnet 6C face each other in the X direction, and the same poles face each other to generate a repulsive force. .. In this way, the moving side magnet 24C and the fixed side magnet 6C function as a magnetic force generating means for generating a magnetic force (repulsive force). Further, the magnetic force generating means arranged on both sides in the X direction also functions as a magnetic urging means by generating an urging force for moving the vibrator 2 toward the vibration center.

Here, the magnetic field lines (magnetic field vector) around the moving side magnet 24C and the fixed side magnet 6C will be described with reference to FIG. Since the moving side magnets 24C are arranged in a Halbach array, the magnetic field lines are concentrated on the outer end face of the moving side magnet 24C in the second magnetic section C2, and the magnetic flux density is increased. Further, since the fixed side magnets 6C are arranged in a Halbach array, the magnetic field lines are concentrated on the inner end surface of the fixed side magnet 6C in the second magnetic section D2, and the magnetic flux density is increased.

According to this embodiment, there are the following effects. That is, since the moving side magnets 24C and 24D and the fixed side magnets 6C and 6D are magnetically partitioned and arranged in a Halbach array, the magnetic field lines can be concentrated on one end surface of the magnet, and the magnet can be arranged. Even when the size is reduced, the repulsive force between the moving side magnets 24C and 24D and the fixed side magnets 6C and 6D can be secured.

The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

For example, in the first and second embodiments, it is assumed that each magnet is magnetically partitioned in the Y direction, but the partitioning direction is the direction in which the moving side magnet and the fixed side magnet face each other (X). The direction may be any direction that intersects with the direction). That is, each magnet may be magnetically partitioned in the Z direction (having a partition screen along the XY plane), or may be magnetically partitioned in the directions inclined in the Y and Z directions.

Further, each magnet may be magnetically partitioned in a plurality of directions. For example, as shown in FIG. 13, the magnet 200 may be partitioned in both the X and Y directions and may have a total of four sections. Further, as shown in FIG. 14, the magnet 201 may be partitioned in both the X direction and the Y direction, and may have a total of nine sections. At this time, the directions of the magnetic poles of the adjacent sections may be opposite to each other.

Further, in the second embodiment, each magnet is divided into three sections to form a Halbach array, but each magnet is divided into five or more odd-numbered sections to form a Halbach array. May be good.

Further, in the first embodiment, it is assumed that the moving side magnets 24A and 24B and the fixed side magnets 6A and 6B are composed of samarium cobalt magnets, but the material of each magnet has required dimensions and characteristics (repulsion). It may be appropriately selected according to the strength of force and heat resistance). Further, the material of the moving side magnet and the fixed side magnet may be different. For example, the moving side magnet close to the coil as a heat source is composed of a samarium cobalt magnet, and the fixed side magnet far from the coil is composed of a neodymium magnet. You may.

Further, in the first embodiment, the motor unit 1A is a linear vibration actuator provided with the vibrator 2, but the motor unit is not limited to the one that generates vibration. That is, the motor unit may be one in which a moving portion that makes a predetermined motion is accommodated in the accommodating means, and a repulsive force is generated between the moving side magnet and the fixed side magnet to apply a force to the moving portion. ..

Further, in the first and second embodiments, the driving means is composed of a magnet provided on the vibrator and a coil provided on the case, but the vibrator is also provided. A magnet may be provided on the case.

In addition, the best configuration, method, and the like for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, although the present invention is particularly illustrated and described primarily with respect to a particular embodiment, it does not deviate from the scope of the technical idea and purpose of the present invention and has a shape relative to the embodiments described above. , Materials, quantities, and other detailed configurations can be modified by those skilled in the art. Therefore, the description that limits the shape, material, etc. disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, those shapes, materials, etc. The description by the name of the member which removes a part or all of the limitation such as is included in the present invention.

1A, 1B Motor unit 2 Oscillator (moving part)
22A to 22C Drive magnet 24A to 24D Moving side magnet 4 coil 5 case (accommodation means)
6A-6D Fixed side magnet

Claims (4)

A movement including a moving portion, a driving means for causing the moving portion to perform a predetermined motion, a magnetic force generating means for generating a magnetic force, and an accommodating means for accommodating the moving portion, the driving means, and the magnetic force generating means. It ’s a unit,
The magnetic force generating means has a moving side magnet provided in the moving portion and a fixed side magnet fixed to the accommodating means, and has a repulsive force between the moving side magnet and the fixed side magnet. Causes
The moving side magnet and the fixed side magnet each have a plurality of sections magnetically partitioned in a direction intersecting each other, and the magnetic poles are opposite to each other in the adjacent sections. A characteristic motor unit. A movement including a moving portion, a driving means for causing the moving portion to perform a predetermined motion, a magnetic force generating means for generating a magnetic force, and an accommodating means for accommodating the moving portion, the driving means, and the magnetic force generating means. It ’s a unit,
The magnetic force generating means has a moving side magnet provided in the moving portion and a fixed side magnet fixed to the accommodating means, and has a repulsive force between the moving side magnet and the fixed side magnet. Causes
The moving side magnet and the fixed side magnet are magnetically partitioned into three or more odd sections in a predetermined direction intersecting the opposite directions, and the section in which the magnetic pole direction is along the opposite direction is the magnetic pole direction. A movement unit characterized in that it is arranged in a Halbach array by being sandwiched between two sections along the intersecting direction. The motor unit according to claim 1 or 2, wherein the moving-side magnet and the fixed-side magnet are composed of a samarium-cobalt magnet. The moving portion is an oscillator capable of vibrating in a predetermined vibration direction.
The driving means has a coil and a driving magnet, and has a coil and a driving magnet.
The moving side magnets are arranged at both ends of the vibrator in the vibration direction.
The motor unit according to any one of claims 1 to 3, wherein the fixed-side magnet is arranged at a position that sandwiches the vibrator in the vibration direction.

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