JPS5842603B2 - Electromagnet for high speed operation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnet of small size, high operating speed, and simple construction, which can be arranged in parallel in high density for use in printing devices and selection devices.

Conventionally, this type of device has a complicated structure as shown in Figure 1, so it has a large number of parts, it is difficult to accommodate a large number of electromagnets in parallel in a small space, and the manufacturing cost is high. was there.

Next, a conventional embodiment will be explained in detail with reference to FIG.

In Fig. 1, a coil 3 is attached to a yoke 1 bent in a generally U-shape and an iron core 2 fixed to it, and a suction plate (armature) 4 made of pure iron restores a retaining plate 5 and a suction plate 4. It is supported by recovery springs 6 to move it to the side.

The spring 6 is hooked on the stopper 7 and constantly pulls the suction plate 4.

The holding plate 5 serves as a stop for the recovery side and excitation side of the suction plate 4, and is made of a material with high magnetic resistance.

The attraction plate 4 is attracted to the iron core 2 by excitation, and when the excitation is released, it separates from the iron core 2 due to the tension of the spring 6, but due to the residual magnetism, the attraction plate 4 is difficult to separate from the iron core 2, and it takes a long time. becomes longer, and its fluctuation time is also large.

Therefore, as a small amount of magnetic resistance in the magnetic circuit, a gap of about 0.1 is provided between the suction plate 4 and the iron core 2 in the suction state, but this gap reduces the suction force.

In order to satisfy these structural requirements, the structure is complicated and the mass of the suction plate 4 cannot be made small.If used for high-speed operation, it is necessary to increase the current flowing through the coil 3, which increases consumption. Since it consumes a lot of electricity and generates a lot of heat, heat dissipation measures are required.
It had many drawbacks, such as not being able to accommodate a large number of electromagnets in a high density, and producing a loud collision sound during suction.

In order to solve these drawbacks, the present invention has an integral structure of the yoke and the iron core, and the suction plate is made of a thin plate made of, for example, 17-7PH material. The regulating receiver for the enclosure is characterized by having a large number of suction plates and iron cores integrated in parallel, without any stoppers.The purpose of this is to reduce the volume of the device by packaging it in high density, and to reduce the cost. The purpose of the present invention is to provide a high-efficiency, high-speed operation electromagnet with low power supply and low noise.

FIG. 2 is a perspective view of an embodiment of the present invention, and FIG.
4 and 5 are exploded views thereof.

Fig. 2 shows a case where four electromagnets are integrally mounted in parallel, in which a coil 9 molded with a material with high thermal conductivity is attached and fixed to an integral iron core 8, and an attraction plate (armature )
10 is fixed to the lower part of the iron core 8.

The gap between the iron core 8 and the suction plate 10 in the non-excited state is determined from the required stroke distance of the suction plate 10.

FIG. 3 shows the suction plate 10. The width of the part corresponding to the iron core 8 is widened to reduce the resistance of the magnetic circuit, and the fulcrum part and tip part are narrowed to shorten the operating time and increase the suction force. The shape is such that the fulcrum parts are connected and integrated.

FIG. 4 is a diagram showing the iron core 8 before the coil 9 is attached thereto. There are upper, middle, and lower protrusions from the main body, and the coil 9 is attached to these.

The length of the overhanging portion is made such that the middle tier is shorter than the lower tier and the upper tier is shorter than the middle tier, so that when the suction plate 10 is sucked, the overhanging surface of each iron core 8 and the suction plate 10 can come into close contact with each other in accordance with the deflection curve. It is.

FIG. 5 shows a coil 9 attached to the iron core 8. The coil 9 at the attachment part and the iron core 8 are brought into close contact with each other, so that the heat generated from the coil 9 can also be radiated from the main body of the iron core 8.
Connect the winding terminals of the upper, middle, and lower stages, mold the upper part, and pull out two lead wires outside the mold.

To operate this, a current is applied to the coil 9 and the suction plate 1
0 to iron core 8.

When a current flows through the coil 9 at the start of suction, the suction plate 1
The suction force in the lower part where the gap between the iron core 8 and the iron core 8 is the smallest is large, and the suction plate 10 is drawn to the iron core 8 by the suction force mainly in this part.

In this process, the gap between the middle iron core 8 and the suction plate 10 becomes smaller, so the suction force in this part also increases, the suction plate 10 bends further, and the gap with the upper iron core 8 becomes smaller as well.
A large suction force is generated on the entire surface.

The suction plate 10 is restored by the deflection energy of the suction plate itself generated by suction.

FIG. 6 shows the waveform of the current supplied when the electromagnet of the present invention is operated to attract at a higher speed.

Generally, in this type of electromagnet mechanism, back tension (spring 6 in Figure 1) is applied in order to stabilize the recovery operation of the suction plate, and when current is passed through the electromagnet in this state, the suction force is The suction plate does not operate until the magnitude of the back tension is reached.

Therefore, in order to quickly operate the attraction plate after supplying the drive current, the electromagnet may be excited with an attraction force equal to or less than the back tension in preparation for the start of supply of the drive current.

In other words, waveform 11 is for this purpose, and is a current waveform in which a small amount of current is intermittent at a constant cycle in order to flow through all the electromagnets in advance, and waveform 12 is a current waveform for attracting and maintaining that state. Current waveform 13 is a current waveform for attraction when attraction is not required, and 14.1
5 is a composite waveform obtained by synchronously combining waveform 11 with waveform 12 or 13, respectively.

Then, a small amount of intermittent current shown in waveform 11 is supplied to the electromagnet in advance to vibrate the suction plate with a minute stroke that prevents the suction plate from being attracted. When suction and holding are required, waveform 12 As shown, an attraction current that continues for the required holding time is applied to the electromagnet in synchronization with the intermittent current.

Therefore, the composite current of waveform 14 flows, and the suction plate is attracted to the iron core, and is held for only the time that the current is flowing.

Further, when it is necessary to maintain the attracted state, a current shown in waveform 13 is caused to flow through the electromagnet in synchronization with waveform 11.

As a result, a current of waveform 15 flows, and after the suction plate is attracted, it is instantly restored.

In this way, by vibrating the suction plate in advance to prepare for the suction operation to be performed easily, and then supplying the suction current in synchronization with this, it is possible to perform the suction operation at high speed at a predetermined timing. .

The effect of this structure is that it is possible to arrange a large number of electromagnets in parallel in one piece.
The suction plate is a single component, and the iron core is also a single block, so the number of components is small and can be housed in high density.

In addition, in the case of suction, the operation of the suction plate can smoothly transition from the lower part of the iron core to the upper part, resulting in an electromagnet with less collision noise and a faster operating time.

The thickness and width of the suction plate are determined from the magnetic flux of the electromagnet, but in that case, if the elastic constant (stiffness) for elastic deflection of the suction plate is too large, the suction energy of the electromagnet will exceed the elastic energy of the suction plate. , and the kinetic energy of the suction plate does not increase.

To solve this problem, the width of the portion of the suction plate adjacent to the root of the suction plate may be made smaller than the width of the central portion of the suction plate in an appropriate manner so that stress concentration does not become a problem.

As explained above, the high-speed operation electromagnet of the present invention has a thin and light suction plate, and has a simple structure with a small number of parts, so it consumes less power, has low noise, and is capable of high-speed operation. It has the advantage of being able to accommodate a large number of electromagnets in a high density and also being able to be manufactured at a low cost.

Therefore, it can be applied to matrix printing machines, line printers, etc. that are composed of a large number of electromagnets.
It is especially suitable for matrix line printers.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional general electromagnet, Fig. 2 is a perspective view of an embodiment of the present invention, Fig. 3, Figs. 4 and 5 are exploded perspective views thereof, and Fig. 6 is a perspective view of an embodiment of the present invention. FIG. 3 is a waveform diagram of current supplied when operating the electromagnet particularly at high speed. 1...Yoke, 2,8...Iron core, 3,9
... Coil, 4, 10 ... Attraction plate (armature), 5 ... Holding plate, 6 ... Spring,
7... Clasp, 11, 12° 1300060.
Current waveform, 14, 15... Composite current waveform.

Claims (1)

[Scope of Claims] 1 A plurality of armature groups are integrally formed using a single metal plate having high bending fatigue strength, high magnetic flux density, and low residual magnetism, with their roots common to each other. , a plurality of iron cores are provided corresponding to one armature hook, and each of the plurality of iron cores is attached with a coil molded integrally corresponding to one armature hook to form an electromagnet. Each armature of the plurality of armature groups can be controlled independently, and when each armature is released from the state in which it is attracted to the magnetic pole of the magnet by excitation, the armature has its own elasticity. A high-speed operating electromagnet characterized by the ability to return to its original state using energy. 2 A plurality of armature groups are integrally formed by a single metal plate with high bending fatigue strength, high magnetic flux density, and low residual magnetism, and the joints made of the metal plate are The width of the part adjacent to the base of the pole is made smaller than the width of the central part of the armature, and a plurality of iron cores are provided corresponding to one armature hook, and the plurality of iron cores are provided with the armature. An electromagnet is constructed by attaching one integrally molded coil corresponding to one pole pot, and each armature of the plurality of armature groups can be independently controlled, and each armature can be controlled by excitation. A high-speed operating electromagnet characterized by having a function in which the armature returns to its original state by its own elastic energy when excitation is released from a state where it is attracted to the magnetic poles of the magnet.