JPH04334960A - Direct-acting motor - Google Patents

Abstract

PURPOSE:To provide a direct-acting motor in which a great driving force can be gotten with small power consumption and small heat generated and a movable member can be restored quickly to the initial position. CONSTITUTION:A permanent magnet 26 is attached to the top of a movable member 24, and the permanent magnet 26 is inserted and positioned in an exciting coil 13. Moreover, a core 16 is inserted and arranged from above in the exciting coil, and by this core 16, the permanent magnet 26 is attracted by magnetism at nonapplication of a current. And at application of a current, the permanent magnet 13 is separated from the core 16 by the magnetic attraction by the magnetic pole generated by the excitation of the exciting coil 13 and the magnetic pole of the permanent magnet 13. Hereby, large driving force can be gotten with small power and small heat generated, and the movable member can be restored quickly to the initial position.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct-acting motor that reciprocates an actuating member using electromagnetic force as a driving force.

0002

2. Description of the Related Art Conventionally, the most common direct drive motors are those that use air or electromagnetic force. A direct-acting motor that uses air introduces compressed air into a cylinder to reciprocate a piston, and requires an air supply source and piping. On the other hand, those that use electromagnetic force generate a magnetic field by energizing an excitation coil, and operate a movable member by the magnetic attraction or repulsion at this time.The movable member is made of a magnetic material such as soft iron. The movable member is manufactured so that the return operation is performed by natural falling due to the weight of the movable member itself or by the force of a spring.

0003

[Problems to be Solved by the Invention] However, the former type of air type direct drive motor requires an air supply source and piping, making the equipment large-scale, and since it uses air, it cannot be used in a clean room. There was a problem that there were some difficulties. On the other hand, with the latter type of electromagnetic direct-acting motor that uses magnetic attraction force or magnetic repulsion force, when trying to obtain a large driving force, a large current is required, which increases the amount of heat generated, and also If a spring is used to force the return of the motor in order to increase responsiveness, the need to overcome this force will require a correspondingly large amount of driving force, resulting in a larger motor and increased power consumption. There was a problem.

[0004] Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to obtain a large driving force with a small amount of electric power in a device that utilizes electromagnetic force. The object of the present invention is to provide a direct-acting motor that can be miniaturized.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a direct drive motor that is equipped with an excitation coil and that operates a movable member by energizing and excitation of the coil. A permanent magnet is disposed on one end surface with one magnetic pole surface fixed, and this permanent magnet is inserted halfway into the excitation coil, and the core is inserted into the excitation coil from the opposite side of the permanent magnet. The permanent magnet is inserted and arranged so that the core magnetically attracts the permanent magnet when the current is not energized.

[0006]

[Operation] In the present invention, one end of the permanent magnet is inserted into the excitation coil and is held at the initial position by being magnetically attracted to the core by its own magnetic force. When the excitation coil is energized and energized, magnetic poles are generated at both ends of the coil, and the permanent magnet is operated and separated from the core by the magnetic repulsion and magnetic attraction between these magnetic poles and the magnetic poles of the permanent magnet. Then, when the power to the excitation coil is cut off, the magnetic field generated by the coil disappears, so that the permanent magnet is magnetically attracted to the core again and returns to its initial position.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a direct-acting motor according to the present invention used in a punching mechanism for a thin plate-shaped object, and FIG. 2 is an exploded perspective view of a die. In these figures, the punch mechanism, which is designated as a whole by reference numeral 1, includes a punch pin 3 for punching a small hole in a thin plate-like object 2, a direct-acting motor 4 for reciprocating the punch pin 3, and a die 5. There is. As the thin plate-like material 2, a ceramic green sheet or a ceramic green tape used in the manufacturing process of telephone cards and multilayer substrates can be considered.

The direct-acting motor 4 has a generally cylindrical shape as a whole, and has a first motor, a first motor, and a first motor arranged coaxially in the vertical direction.
It comprises second bodies 6, 7 and a connecting pipe 8 interposed between these two bodies 6, 7, and the lower end and upper end of the first and second bodies 6, 7 are fitted to the outer periphery of the connecting pipe 8, respectively. Fixed.

The first body 6 includes an outer cylinder 10 and a core mounting member 11 that is fitted and fixed to the upper end opening of the outer cylinder 10, and includes an excitation coil wound around the outer peripheral surface of the bobbin 14 inside. 13 and a core 16 whose upper end is fitted and fixed into the center hole of the core mounting member 11 and whose lower end is inserted into the center hole 15 of the bobbin 13 to a position slightly below the center. The core 16 is made of a magnetic material with high magnetic permeability, such as silicon steel.

The second body 7 includes an outer cylinder 18 and an inner cylinder body 20 whose upper end is fitted and fixed to the outer cylinder 18 and the connecting pipe 8 and whose lower end extends and projects below the outer cylinder 18. This inner cylindrical body 20 is held substantially vertically by a holding member 21 attached to a device fixing part. A cylindrical body 23 made of hardened steel or the like is fitted and fixed inside the inner cylindrical body 20, and further inside this cylindrical body 23, a movable member 24 which is moved in the axial direction by the electromagnet 12 is of a direct acting type. It is inserted and arranged through a bearing 25. The movable member 24 is made of ceramic or the like and has a cylindrical shape, and a permanent magnet 26 and a stopper member 27 are coaxially arranged at the upper end. Permanent magnet 26
is formed in a cylindrical shape and is fixed to the upper surface of the movable member 24,
For example, the upper end surface is magnetized to the N pole, and the lower surface is magnetized to the S pole. The upper end of the permanent magnet 26 is connected to the bobbin 1.
It is loosely fitted into the center hole 15 of No. 4 from below and magnetically attracted to the core 16. The stopper member 27 is formed into a cylindrical shape and integrally has a stopper 28 formed of an annular projection at the center of its outer peripheral surface, and the upper end of the movable member 24 and the permanent magnet 2
A pair of upper and lower buffer members 30 and 31 made of rubber rings or the like are fitted onto the outer circumferential surface with the stopper 28 in between. The upper buffer member 30 is normally pressed against the lower surface of an upper limit stopper 32 annularly protruding from the inner circumferential surface of the connecting pipe 8 by the magnetic attraction force of the permanent magnet 26, thereby moving the movable member 24 to the initial position. It is locked in. In this state, a minute gap is set between the core 16 and the permanent magnet 26. On the other hand, the upper end surface of the cylinder 23 is connected to the movable member 24.
A lower limit stopper 34 is formed by the lower buffer member 31 coming into contact with the lower buffer member 31 during operation.

The lower end portion of the movable member 24 is connected to the inner cylindrical body 2.
A cylindrical protector 36 and a pin guide 37 are disposed at the protruding end to protect the punch pin 3, and a bottomed cylinder is provided on the outer periphery of the protector 36. A shaped cap 38 is screwed and fixed. The pin guide 37 is fitted and fixed inside the protector 36, and the punch pin 3 is slidably inserted into the center hole 40. The lower end of the punch pin 3 projects downward from a small hole 41 formed in the center of the lower surface of the cap 38. A cylindrical buffer member 42 made of sponge or the like is fixed to the lower surface of the cap 38.

The die 5 includes a rectangular parallelepiped block 52;
A plate 53 is fixed to the upper surface of the block 52. A punch dregs collection hole 54 that opens on the upper and lower surfaces is formed through the center of the block 52, and the lower end opening of this punch scum collection hole 54 is connected to a vacuum pump 56 via a pipe 55. A punch hole 57 having a hole diameter approximately equal to or slightly larger than the outer diameter of the punch pin 3 is formed in the center of the plate 53. A groove 58 is formed on the upper surface of the block 52, one end of which communicates with the punch dregs recovery hole 54 and the other end of which is open to one side of the block 52. A pipe 59 forming an air passage 60 is formed in this groove 58. is inserted. The pipe 59 is provided to prevent punch scum 61 from clogging the punch hole 57 when punching the thin plate-like object 2 with the punch pin 3, and one end opening 59a is located below the punch hole 57 of the plate 53. It is located nearby and communicates with the punch dregs collection hole 54, and the opening at the other end communicates with the outside of the block 52. Therefore, the air passage 60 is also evacuated by the vacuum pump 56 together with the punch scrap collection hole 54.

In such a configuration, the permanent magnet 26 is usually
is at the uppermost position by being magnetically attracted to the core 16, and holds the punch pin 3 at the initial position. In this state, the excitation coil 13 is excited by energization, and as shown in FIG.
When a magnetic field 62 is generated in the direction of canceling the magnetic field 63 shown by the solid line of the permanent magnet 26 shown by the broken line, the upper end of the coil becomes N.
Since the pole and the lower end side are the S pole, the coil 13 and the permanent magnet 2
6, magnetic repulsion and magnetic attraction generated between
That is, the repulsive force between the S pole on the lower end side of the coil and the S pole of the permanent magnet 26, and the repulsive force between the S pole on the lower end side of the coil and the N pole of the permanent magnet 26.
Due to the attractive force between the poles, the permanent magnet 26 is forcefully separated from the core 16 and moved downward. Therefore, the movable member 24 also moves together with the permanent magnet 26, and the punch pin 3 punches a small hole at a predetermined location of the thin plate-like material 2 positioned on the die 5. When the excitation coil 13 is turned off, the magnetic field generated by the excitation coil 13 disappears, so the permanent magnet 2
6 is magnetically attracted to the core 16 and quickly rises and returns to the initial position. This magnetic attraction force is inversely proportional to the square of the distance between the core 16 and the permanent magnet 26, and a large attraction force can be obtained when the stroke of the punch pin 3 is as small as about 5 mm. Then, by moving the thin plate-like object 2 using an unillustrated XY stage or the like and repeatedly operating the movable member 24 by energizing the excitation coil 13, small holes can be continuously bored in the thin plate-like object 2. .

Punch dregs 61 generated when a small hole is punched in the thin plate-shaped object 2 by the punch pin 3 are pushed out below the punch hole 57 by the punch pin 3, fall below the punch dregs collection hole 54, and are collected (not shown). Collected in the case. However, if the adhesion force with the punch pin 3 is large, it will not fall and be recovered, and the punch hole 5 will not be recovered as the punch pin 3 returns.
7. There is a risk of it becoming clogged. Therefore, a pipe 59 that communicates with the outside is provided in the die 5, and its inner open end is connected to the punch hole 57.
When the air in the punch dregs collection hole 54 and the pipe 59 is sucked and exhausted by the vacuum pump 56, the air outside the die 5 is sucked into the punch dregs collection hole 54 through the pipe 59. to form an air flow 65 and create a negative pressure below the punched hole 57. Therefore, the punch dregs 61 adhering to the lower surface of the punch pin 3 pushed out below the punch hole 57 are subjected to a downward force by the air flow 65, so that they are well separated from the punch pin 3 and are dropped and collected.

In the direct-acting motor 4 having such a structure, the permanent magnet 26 provided at the upper end of the movable member 24 is inserted into the excitation coil 13, so that
The permanent magnet 26 can be separated from the core 16 by using magnetic repulsion and magnetic attraction forces generated between the excitation coil 13 and the permanent magnet 26 of the movable member 24 at the same time. Therefore, if the current and number of turns of the coil are the same, it is possible to obtain twice the driving force compared to the conventional drive using only magnetic repulsion or magnetic attraction. Furthermore, in order to obtain the same driving force, the current can be reduced or the number of turns of the coil can be reduced. Furthermore, since the permanent magnet 26 is magnetically attracted to the core 16, a return spring is not required, the structure is simple, and the permanent magnet 26 can be returned to the initial position quickly.

[0016]

Effects of the Invention As explained above, the direct-acting motor according to the present invention utilizes both magnetic repulsion and magnetic attraction. A larger driving force can be obtained compared to one that uses only suction force for driving. Furthermore, if the driving force is kept the same, the current or the number of turns of the coil can be reduced, making it possible to save power consumption or downsize the motor itself. Furthermore, since the permanent magnet is magnetically attracted by the core, a return spring is not required, and the movable member can be returned to the initial position quickly with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to a punch mechanism.

FIG. 2 is an exploded perspective view of the die.

[Explanation of symbols]

1 Punch mechanism 2　Thin plate-like object 3 Punch pin 4 Direct-acting motor 5 Die 13 Excitation coil 14 Bobbin 16 core 24 Movable member 26 Excitation coil

Claims (1)

[Claims] 1. A direct-acting motor that is equipped with an excitation coil and that operates a movable member by energizing and excitation of the coil, wherein a permanent magnet is fixed to one end surface of the movable member with one magnetic pole surface fixed to the movable member. and inserting this permanent magnet to a halfway position inside the excitation coil,
A direct-acting motor characterized in that a core is inserted into the excitation coil from the side opposite to the permanent magnet, and the permanent magnet is magnetically attracted by the core when the current is not energized.