JPH1189210A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motor which is used as an electric appliance driving source which linearly drives the mobile section of an electric appliance. SOLUTION: A linear motor is composed of a bottomed pipelike coil bobbin 25a for winding an exciting coil 25b, a permanent magnet 23 which is slid in the bobbin 25a and has two magnetic poles of N and S, an armature core 24 which forms a magnetic path on the internal surface of the bobbin 25a which is bonded to the magnet 23, a bottomed pipe-like yoke 22 which is loosely put on the outer periphery of the bobbin 25a and made of a magnetic material and to the bottom of which the magnet 23 is integrally attached, and a driving shaft 26 which is detachably inserted into the bottom face of the bobbin 25a after passing through the center of the bottom face of the yoke 22, the magnet 23, and the armature core 24.

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 use in an electric device which reciprocates a movable portion linearly.

[0002]

2. Description of the Related Art Conventionally, motors have been widely used as drive sources in various electric appliances. FIG. 5 shows an example in which the motor is used for a facial treatment device A that strikes the skin surface such as the face like a puff to stimulate the skin surface and maintain vital skin. In FIG. And a connection adapter 4 for connecting the attachment 2 for hitting the face and the transmission shaft 3 with a pusher provided at an end of the transmission shaft 3 (the right side in FIG. 5). The moving plate 5 is operated by the rotation of the eccentric cam 6 to reciprocate the hitting attachment 2 back and forth (left and right in FIG. 5). For example, a motor 7 driven by DC current is A rotor shaft 12, which will be described later, is attached to a housing 9 at the base end of the protruding portion 8 so as to be unswingable with the rotor shaft 12 facing the center of the case 1.

Next, the structure of the DC motor 7 will be described. In FIG. 5, reference numeral 10 denotes a bottomed cylindrical casing having an opening on the upper side, and two permanent magnets 11, 11 for N and S counter electrodes are attached to the inner peripheral side surface thereof using an adhesive or the like. I have. Reference numeral 12 denotes the above-described rotor shaft extending upward from the bottom surface of the casing 10 to the inside of the case 1 through a central portion of a lid 13 closing an opening of the casing 10. , An armature iron core 15 wound with an exciting coil 14 for supplying a drive current is fixed to the pair of permanent magnets 11 while keeping a small space.

When the motor 7 is driven,
When a current is applied to the exciting coil 14 wound around the armature core 15 from a DC power supply (not shown), the electromagnetic force according to Fleming's left-hand rule is generated by the magnetic flux φ of the permanent magnets 11 and the current supplied from the DC power supply. Acts on the armature core 15 to rotate the rotor shaft 12 in a predetermined direction. The eccentric cam 6 attached to the tip of the rotor shaft 12 by the rotation of the rotor shaft 12 pushes the pressing plate 5 provided at the end of the transmission shaft 3 by the long edge a side, and attaches the attachment 2 for hitting the face. FIG.
At the left. When the eccentric cam 6 further rotates and the short edge b side is positioned on the pressing plate 5 side, the transmission shaft 3 is driven by the elastic force of the coil spring 16, and the attachment 2 for hitting the face is moved to the right in FIG. Push in the direction. By continuously performing the left-right movement of the transmission shaft 3 in this manner, the attachment 2 for hitting the face vibrates (reciprocates) in the left-right direction of FIG. 5 and hits the skin surface such as the face like a puff. To stimulate the skin surface.

[0005]

However, the facial beauty device A
The DC motor 7 used has the following problems. That is, since the motor 7 shown in FIG. 5 has a structure in which the rotor shaft 12 is rotated by the magnetic flux φ of the permanent magnets 11 and the DC current flowing through the exciting coil 14, for example, the motor 7 shown in FIG. When the motor 7 is used for an electric device such as a facial beauty device A that reciprocates the attachment 2 linearly,
It is necessary to provide a movement direction converting means such as the eccentric cam 6 at the tip of the rotor shaft 12 so as to convert the rotational movement of the rotor shaft 12 into a linear movement of the hitting attachment 2 for use.
There has been a problem that the structure of this type of equipment is complicated and the manufacturing cost of electrical equipment is increased.

In addition, the motor 7 is disposed at the base end of the projecting portion 8 of the case 1 because the rotor shaft 12 is arranged in a vertical direction orthogonal to the longitudinal (front-rear) direction of the hitting attachment 2. Because it was stored in the storage case 9 provided,
Not only the shape is distorted due to the presence of the overhanging portion 8, but also the size is increased and the user is very difficult to handle.
It was inconvenient to carry.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an improved linear motor capable of reducing the installation space of a motor used as a drive source for an electric device that reciprocates a movable portion linearly. It is in.

[0008]

According to a first aspect of the present invention, there is provided a linear motor having a bottomed cylindrical coil bobbin on which an exciting coil is wound, and which is slid on the inner periphery of the coil bobbin, and which has two magnetic poles, N and S, for magnetic flux to the outside. And a bottomed cylindrical magnetic material loosely joined to the outer periphery of the coil bobbin, the armature core being joined to the permanent magnet to form a magnetic path on the inner periphery of the coil bobbin, A yoke integrally attached to a magnet, and a drive shaft penetrating through the center of the bottom surface of the yoke, the permanent magnet and the armature core, and non-removably fitted to the bottom surface of the coil bobbin. And

The armature iron core of the linear motor according to the present invention is characterized in that the armature iron core or a drive shaft penetrating the armature iron core is provided with a rotation preventing means.

[0010] A coil bobbin of a linear motor according to a third aspect is characterized in that a plurality of ventilation holes are formed on a bottom surface.

According to a fourth aspect of the present invention, in the exciting coil of the linear motor, a coil conductor in which a hot-melt resin such as epoxy resin is coated on an insulating film is wound around the outer periphery of the coil bobbin, and the coil conductor is insulated in a high-temperature bath. It is characterized in that the films are formed by fusion bonding.

According to the present invention, an electromagnetic force according to Fleming's left-hand rule is applied to a movable coil bobbin by a magnetic flux of a permanent magnet and a current supplied from a DC power supply, so that a drive shaft integrally mounted with the coil bobbin is provided. Because the motor is operated linearly, for example, even when the motor is used as a drive source for an attachment for beating of a facial beauty device, there is no need to use a means for changing the direction of movement such as an eccentric cam, and the structure is reduced. At the same time as simplifying the attachment for hitting,
Since the axial directions of the drive shafts of the motors can be the same, the space factor of the motor in the case can be reduced, and the entire device can be reduced in size and can be easily carried.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is used as a driving source for a beating attachment of a facial device, for example, with reference to FIGS. In FIG. 1, reference numeral 17 denotes a case of a facial beauty device B, which is formed so as to be divided into two parts in the vertical direction. Motor (hereinafter simply referred to as a motor) 19 for reciprocating the attachment 18 back and forth (left and right in FIG. 1) is formed in a hollow cylindrical shape in which a flange 20 is screwed to a front wall 17a of a case 17 with a fastening screw. Motor mounting body 2 comprising a cylindrical body 20a and a pan-shaped mounting portion 20b formed integrally with the cylindrical body 20a.
1 is irremovably attached.

Next, the structure of the motor 19 will be described. In FIG. 2 (a), reference numeral 22 denotes a bottomed cylindrical yoke provided with an opening on one side, and a projection 22a is formed at the center of the bottom surface so as to protrude toward the opening.
For example, a permanent magnet 23 having the N-pole side is attached thereto using an adhesive or the like. Reference numeral 24 denotes an armature core whose longitudinal section is formed in a U-shape, and whose open end is directed toward the opening of the yoke 22 and fastened to the permanent magnet 23, for example, on the S pole side using an adhesive or the like. This armature iron core 24
At the lower edge of the opening end of the yoke 22, a guide pin 24a is implanted horizontally toward the opening of the yoke 22.

Reference numeral 25 denotes a movable coil which is loosely fitted on the outer periphery of the permanent magnet 23 and the armature core 24 so as to be able to reciprocate along the axial direction thereof while keeping a constant interval a in the yoke 22.
A bottomed cylindrical coil bobbin 25a which is loosely fitted to the outer periphery of the permanent magnet 23 and the armature core 24 so as to close the opening side of the yoke 22, and a hot-melt resin such as epoxy resin is applied to the outer periphery of the coil bobbin 25a. And an exciting coil 25b formed by winding a coil conductor applied on the insulating film. The exciting coil 25b wound around the outer periphery of the coil bobbin 25a is placed adjacent to the coil bobbin 25a by melting the hot-melt resin applied on the insulating film of the exciting coil 25b in a high-temperature chamber having a temperature of about 150 ° C. The insulating films of matching coil conductors are joined together.

On the other hand, the bottom surface 25 of the coil bobbin 25a
g (rightward direction in FIG. 2 (a)), a locking step 2
A cylindrical body 25d having an inner surface 5c is formed to protrude toward the permanent magnet 23, and a guide pin 2 implanted in the armature iron core 24 is provided below the bottom surface 25g.
A through-hole 25f through which 4a protrudes is formed. Further, the coil bobbin 2 located on the side opposite to the through hole 25f
A pair of terminals 25e, 25e for connecting the lead wire c of the exciting coil 25b and the lead wire d on the power supply side is provided on the upper part of the bottom surface 25g of the yoke 22 so as to project toward the opening of the yoke 22. I have.

Reference numeral 26 denotes a bottom surface 25 of the coil bobbin 25a.
g, a driving shaft that penetrates a cylindrical body 25d protruding from the bottom surface 25g and is non-detachably secured to the base using a retaining ring e or the like outside the bottom surface 25g.
As shown in FIG. 2A, the drive shaft 26 has a distal end portion locked by the convex portion 22a of the yoke 22, penetrates the permanent magnet 23 and the armature core 24, and is provided inside the armature core 24. It is slidably fitted into a bearing cylinder 27 having a T-shaped cross section secured using a retaining ring f. And at the tip of the drive shaft 26 projecting from the yoke 22 via the bearing cylinder 27,
A connecting member 26a having a projection 26c provided on the outer peripheral surface is fastened so as not to come off. The movable coil 25
A plurality of ventilation holes 28 are formed in the bottom surface 25g of the (coil bobbin 25a) as shown in FIG.

When the motor 19 is to be mounted on the facial beauty device B shown in FIG.
, And the face tapping attachment 18 is inserted into the connection adapter 29 from the opening side near the locking ridge 31 of the connection adapter 29, respectively. Connector 2 of the drive shaft 26
6a is engaged with the concave groove 30 of the connection adapter 29, and the mounting shaft 18a of the hitting attachment 18 is engaged with the locking ridge 31 of the connection adapter 29 by using the notches 32 and 33, respectively. The attachment 18 for hitting the face is attached to the attachment 18 via a connection adapter 29.

Next, after the drive shaft 26 of the motor 19 is connected to the attachment 18 for striking the face as described above, when the beautifier B shown in FIG. 1 is operated, first, a power switch (not shown) is turned on. Then, a current is supplied to the exciting coil 25b of the motor 19 from a DC power supply (not shown) in the direction shown in FIG. 3A, and this current is applied to the closed magnetic circuit formed by the yoke 22 → the armature core 24 → the permanent magnet 23. The electromagnetic force acts on the movable coil 25 (drive shaft 26) of the motor 19 due to the magnetic flux φ of the permanent magnet 23 passing through
As shown by a two-dot chain line from the position shown by the solid line in FIG.
Moves (retreats) rearward (rightward in FIG. 3A) along the guide pin 24a and the bearing cylinder 27.

Thereafter, when a current is applied to the exciting coil 25b of the motor 19 in the direction shown in FIG. 3B, the electromagnetic force is applied to the movable coil 25 (drive shaft 26) in the same manner as described above. Acting on the movable coil 25 and the movable coil 2
The drive shaft 26 fixed to 5 is moved forward from the position shown by the solid line in FIG.
(Left direction of (b)). in this way,
By applying a current to the movable coil 25 of the motor 19 by switching the polarity (+,-) at regular intervals, the drive shaft 26 moves back and forth at a constant cycle, and the coupling adapter 29 is connected to the drive shaft 26. The striking attachment 18 attached via the body is brought into contact with or away from the skin at a rate of several times per second, for example, to massage the skin surface.

As shown in FIG. 2 (b), the motor 19 has a bottomed cylinder which fits into an inner bottom surface of an armature core 24 having a U-shaped vertical section and an outer periphery of the armature core 24. A tension spring g having a predetermined elastic force is provided between the bottom surfaces of the coil bobbins 25a having a T-shape, or the bearing cylinder 27 having a T-shaped cross section.
And a ring-shaped cushioning member 34 made of rubber or the like, a compression spring g 'having the same predetermined elastic force is interposed therebetween, and the movable coil 25 and the drive shaft 26 are moved from the position shown by the solid line in FIG. Only when moving backward (shown to the right in FIG. 3A) indicated by a two-dot chain line, an electromagnetic force is applied by energization from a DC power supply (not shown), and thereafter, from the position shown by a solid line in FIG. When moving (forwarding) forward (in the leftward direction in FIG. 3B) indicated by the dashed-dotted line, the energization from the DC power supply is cut off, and the movable coil 25 and The drive shaft 26 is connected to the drive shaft 26 in FIG.
May be moved to the left (forward) to move the hitting attachment 18 back and forth at a constant cycle.

At this time, the movable coil 25 and the drive shaft 2
6 causes micro-vibration by several forward / backward movements per second and tries to rotate around the axis inside the yoke 22 with the help of various external factors.
As shown in FIG. 4, a through hole 25 f through which a guide pin 24 a implanted in the armature core 24 protrudes and penetrates is formed in the g, so that the rotation of the movable coil 25 and the drive shaft 26 The guide pin 24a and the through hole 25f can surely avoid this, and the bottom surface 25g of the coil bobbin 25a
The reliability of the connection between the pair of terminals 25e, 25e protruding from the upper part and the lead wire d on the power supply side can be maintained.

However, the movable coil 25 and the drive shaft 2
The rotation of the bearing 6 is not limited to the above-described method. For example, the drive shaft 26 shown in FIG. The rotation of the movable coil 25 and the drive shaft 26 may be prevented by, for example, forming the hollow shape of the 27 and the longitudinal cross-sectional shape of the drive shaft 26 into an elliptical shape.

The bottom surface 25g of the movable coil 25
Is a plurality (two in FIG. 4) as shown in FIG.
The movable coil 25 is reciprocated due to the presence of the ventilation holes 28, 28 even when the movable coil 25 repeatedly reciprocates at a high speed several times per second. The air resistance applied to the bottom surface 25g during the movement can be reduced as much as possible, and the high speed movement of the movable coil 25 is enabled.

Further, on the outer periphery of the coil bobbin 25a of the movable coil 25, a coil conductor coated with a hot-melt resin such as an epoxy resin on an insulating film is wound.
Thereafter, in a high-temperature bath (not shown) having a temperature of about 150 ° C., since the hot-melt resin is melted and joined to adjacent coil conductors, as described above, the movable coil 25 around which the coil conductors are wound is moved at high speed. Even if the coil conductor is moved back and forth, the coil conductor wound around the coil bobbin 25a does not loosen or unravel and can maintain good conductivity.

Since the motor 19 has the drive shaft 26 disposed on the same line as the tapping attachment 18 via the connecting adapter 29, the space factor of the motor 19 in the case 17 of the facial beauty device B can be reduced. In addition, as in the case of the conventional facial treatment device A shown in FIG. 5, a movement direction converting means such as an eccentric cam 6 for converting the rotational movement of the rotor shaft 12 into a linear movement of the hitting attachment 2 is used. Since there is no need at all, the mechanism is simplified and the manufacturing cost is reduced, which is economical.

Furthermore, since the motor 19 has the drive shaft 26 and the hitting attachment 18 arranged on the same line in the axial direction, the case 1 has the same structure as the conventional facial treatment device A shown in FIG.
There is no need to form an overhanging portion 8 for disposing the motor 7 therein, and the shape of the facial beauty device B becomes smart and the size is reduced, so that the user is easy to handle and easy to carry. Become.

Although the present invention has been described with reference to an example in which the linear motor 19 is used in a facial treatment device, the present invention is not limited to this. The present invention is also applicable to other electric devices such as an electric toothbrush in which a movable portion operates linearly. Of course, you can.

As described above, the present invention uses a linear motor that moves a drive shaft back and forth as a drive source of an electric device that moves a movable part linearly, for example, a beating attachment in a facial beauty device. By doing so, the drive shaft of the linear motor can be arranged on the same line as the mounting shaft of the attachment for hitting the face, the space factor of the motor in the electric device can be reduced, and the electric device main body can be reduced. The size can be reduced.

[0030]

According to the linear motor of the present invention, the drive shaft of the linear motor as the drive source can be arranged on the same line with respect to the movable part of the electric equipment. It is not necessary to provide a movement direction converting means for converting the direction of movement between the movable parts, and the mechanism is simplified, and the overhanging part for disposing the linear motor is not formed in the case of the electric device. The main body of the electric device can be miniaturized, and the user can easily handle and carry the device.

In the linear motor of the present invention, the movable coil and the drive shaft are moved back and forth at a high speed several times per second to cause micro-vibration, thereby rotating the movable coil and the drive shaft around the axis in the yoke. The movable coil is prevented from rotating by the rotation preventing means provided on the bottom surface by, for example, drilling a through hole through which a guide pin implanted in an armature iron core penetrates the bottom surface of the movable coil, The lead wire connected to the terminal projecting from the bottom surface of the movable coil can be prevented from being disconnected or entangled by the rotation of the movable coil.

Further, the movable coil has a plurality of ventilation holes formed in the bottom surface, and the air resistance applied to the bottom surface of the movable coil when the movable coil repeatedly moves back and forth at high speed is reduced as much as possible by the ventilation holes. This enables high-speed driving of the movable coil.

In addition, according to the present invention, a coil conductor in which a hot-melt resin such as an epoxy resin is applied on an insulating film is wound around a coil bobbin of the movable coil, and the coil conductors are adjacent to each other in a high-temperature bath at about 150 ° C. Because the coil conductors are joined by melting a hot-melt resin applied on an insulating film to form an exciting coil, even when the movable coil around which the coil conductor is wound moves back and forth at high speed, Disconnection and loosening of the coil conductor wound around the coil bobbin can be prevented.

[Brief description of the drawings]

FIG. 1 is a cutaway sectional view of a main part of a facial beauty device provided with a linear motor of the present invention.

FIG. 2 is a longitudinal sectional view of the linear motor of the present invention.

FIG. 3 is an explanatory diagram illustrating an operation state of the linear motor of the present invention.

FIG. 4 is a rear view of the linear motor of the present invention.

FIG. 5 is a cutaway sectional view of a main part of a facial beauty device provided with a conventional DC motor.

[Explanation of symbols]

 B Beauty device 17 Case 19 Linear motor 22 Yoke 23 Permanent magnet 24 Armature iron core 24a Guide pin 25 Moving coil 25a Coil bobbin 25b Exciting coil 25f Through hole 26 Drive shaft 28 Vent hole

Claims (4)

[Claims] A bottomed cylindrical coil bobbin on which an exciting coil is wound; and N, S sliding on the inner periphery of the coil bobbin.
A permanent magnet which generates a magnetic flux outside by two magnetic poles, and
An armature core that is joined to the permanent magnet and forms a magnetic path on the inner periphery of the coil bobbin; A yoke, and a drive shaft penetrating through the center of the bottom surface of the yoke, the permanent magnet and the armature core, and non-removably fitted to the bottom surface of the coil bobbin. 2. The linear motor according to claim 1, wherein the armature core is provided with an anti-rotation means on the armature core itself or on a drive shaft penetrating the armature core. 3. The linear motor according to claim 1, wherein the coil bobbin has a plurality of ventilation holes formed on a bottom surface. 4. An exciting coil, wherein a coil conductor obtained by applying a heat-melting resin such as epoxy resin on an insulating film is wound around the outer periphery of the coil bobbin, and the coil conductor is melt-bonded between the insulating films in a high-temperature bath. 4. The linear motor according to claim 1, wherein the linear motor is configured to be driven.