JPS5947712A - Electromagnet device - Google Patents

Abstract

PURPOSE:To attempt to save energy consumed by an electromagnet device by eliminating its noise and holding its apparent power and power consumption while in operation to the minimum through such an arrangement wherein an AC power source is impressed on a series circuit, and No.1 and No.2 fixed iron cores are magnetically insulated from each other, but they are mechanically interconnected, and No.1 and No.2 movable iron core are also magnetically insulated from each other, but they are also mechanically interconnected. CONSTITUTION:A fixed iron core 1a is wrapped around by a coil 2a, and a movable iron core 3a is arranged opposingly to the fixed iron core 1a. The yoke 16a of the fixed iron core 1a is magnetically insulated by a gap or a nonmagnetic body 14 and it makes a pair with a yoke 16b of another fixed iron core 1b, and under this condition, the fixed iron cores 1a and 1b are mechanically interconnected securely by rivets, etc. while they are magnetically insulated from each other. On the one hand, a movable iron core 3b is arranged opposingly to the fixed iron core 1b, this movable iron core 3b is magnetically insulated from the movable iron core 3a by a gap or a nonmagnetic body 15, and the movable iron cores 3a and 3b are mechanically interconnected securely by rivets, etc. while they are magnetically insulated from each other.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in crows and magnets.

[Technical background of the invention]

FIG. 1 shows an example of a conventional electromagnet. In the figure, reference numeral 1 denotes a U-shaped fixed iron core, and a coil 2 is wound around this fixed iron core 1.

Also, a predetermined gap l is provided opposite the fixed iron core 1.

A movable iron core 3 is arranged apart from each other.

In an electromagnet with such a configuration, when the coil 2 is energized, the fixed core 1 is magnetized and attracts the movable core 3, and conversely, when the coil 2 is de-energized, the fixed core 1 loses its magnetic force and the movable core 3 returns to its original state. Return to position.

FIG. 2 is a characteristic curve diagram showing the relationship between the electromagnetic attraction force by which the movable iron core 3 is attracted to the fixed iron core 1 by energizing the coil 2 and the gap l, where the vertical axis represents the attraction force; Further, the horizontal axis indicates the void l.

FIG. 3 shows an electrical equivalent circuit of the electromagnet MG, in which a and b are input terminals connected to a power source. Electromagnet MG generally has reactance ωL and resistance R.
are connected in series, reactance ωL and air gap! The relationship with is as shown in the characteristic curve shown in FIG.

FIG. 5 shows the state after the movable core 3 is attracted to the fixed core J.
This shows the suction force acting on the movable iron core 3, and A in the figure
The suction cuff time curve shown in is surrounded by the dark coil 4 and 1
The attraction force generated in the magnetic pole portion 5a, which is also the attraction force indicated by B! The temporal curves each indicate the attractive force generated in the magnetic pole portion 5b that is not surrounded by the bearded coil 4. Still, the total suction power that is the sum of the suction force characteristic curve A and the suction force characteristic quantity ill B 'c is the suction force! It is shown as Fke characteristic curve C. In other words, suction power!
With the suction force shown by the temporal curve C, the 'i=J moving iron core 3 is suctioned and held by the fixed iron core against the load reaction force.

[Problems with background technology]

In the conventional electromagnet as described above, when the bear coil 4 is disconnected, the attractive force shown by the attractive force time curve B is no longer generated, and foreign objects such as dust are caught on the magnetic pole surface. In such cases, the suction force shown by the suction force characteristic curve B becomes extremely small, and in either case, electromagnet noise may occur. In other words, as the overall suction force C becomes larger or smaller than the load resistance gradient over time, the movable core 3 repeatedly approaches and separates from the fixed core 1, and noise is generated at this time. It is.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to provide an electromagnetic device that can eliminate noise generation and reduce apparent power and power consumption during operation to save energy. It is about providing.

[Summary of the invention]

In order to achieve the above object, the present invention provides an electromagnet that magnetically attracts an OT moving iron core by energizing a coil wound around a fixed iron core. It is configured to apply AC power to a series circuit in which a second coil is connected in series on the terminal side, and includes a first fixed iron core around which the first coil is wound and a second fixed iron core around which the second coil is wound. The first fixed core is magnetically insulated and mechanically connected to the fixed core, and is opposed to the first and second fixed cores, respectively. It is characterized in that the second movable iron core is also magnetically insulated and mechanically connected.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below. FIG. 6 shows an example of a dry magnet device according to the present invention. In the figure, 1a is a U-shaped identification core, and a coil 2a is wound around this fixed core 1a. Also,
A uJ dynamic core 3a is arranged opposite to the fixed core 1a and separated by a predetermined gap l. Coil 2 of the fixed iron core 1a
The yoke part 161L where a is not wound is insulated by air gap or non-magnetic material 14, and the yoke part 16b where the coil 2b of the other fixed iron 1b is not wound.
In this state, each of the fixed cores 1a and 1b is mechanically fixed with rivets (not shown), and the fixed core 1
a and ) b are firmly connected in a magnetically insulated state. On the other hand, a predetermined space 1) i facing the fixed iron core 1b on the above side
! A movable iron core 3b is placed 4 apart from the movable iron core 3b, and this moving iron core 3b is also magnetically insulated from the movable iron core 3a by an air gap or a non-magnetic material 15, and is mechanically insulated by a rivet or the like (not shown). Furthermore, the movable cores 3a and 3b are firmly connected in a magnetically insulated state. Note that air gaps or non-magnetic bodies 14, 15 are installed so that the movable iron core 3b and the fixed iron core 1a and the movable iron core 3a and the fixed iron core 1b are magnetically insulated. Further, one end of the coil 2a is connected to the power supply connection terminal a, and the other end is connected to the AC 1N converter 1.
3, and the other end of the AC/DC converter device 13 serves as a power supply connection terminal. and,
The coil 2b is connected to the DC output side of the AC/DC conversion device 13. The electrical equivalent circuit of this electromagnet is shown in FIG. MGa is an AC-excited electromagnet, and MGb is a DC-excited electromagnet.

In an electromagnet device having such a configuration, when an alternating current voltage is applied to power supply terminals a and b, the actance of the electromagnet MGi consisting of the coil 21L, fixed iron core 1a, and movable iron core 3a is
As shown in FIG. 4, when the gap l is large, the force is small, and when the gap l is /h small, the force is large. However, it consists of a coil 2b, a fixed iron core 1b, and a moving iron core 3b.
[h magnet, ~iGh reactance ωLb(riI',
, does not change due to the gap e1. For this, the pressure sr' applied to the source terminals a and b is also the source 1;
tt:f-, when the air gap l is large, d, most of the electric power 11 is applied to the coil 21], and when the air gap l is small, the electric power 11 is also applied to the coil 2a.

To explain this in detail using a mathematical formula, if the force of the electromagnet ■Ga is Z $1,'Fl\, and the impedance of the magnet MGb is f''7.b, then the tti pressure applied to the coil 2b is E2b+- , 32.

As described above, in KZb, tl is constant, but Z2 changes depending on the gap e. When the air gap l is large, is the impedance Z8 a little smaller than Zb? Assuming it is small enough to be a big brother, the movable core 3a, ,? b f fixed core Ja
The attraction force that attracts +2b is lightning, magnet 1vNG1. will occur for the most part. However, when the suction is completed, the gap 1 becomes smaller, so that the impedance z8 also becomes larger, and the suction holding force MGb and MGa share their respective roles. However, the impedance (Za+Zb)
is larger than before the start of suction, so after suction is completed, the amount of current flowing through the circuit becomes smaller, and therefore the apparent power and power consumption are reduced.

FIG. 8 shows the suction force acting on the rotating iron cores 9a and 3b after suction is completed. In the figure, the attraction force characteristic curve E shows the attraction force generated by the electromagnet MGa, and the attraction force characteristic curve F1 shows the total attraction force generated by the electromagnet MGb. This is the attraction force characteristic curve G, and it can be seen that the movable core Ja+Jb is attracted and held by the fixed core 7a+Jb against the load reaction force.

On the other hand, since the electromagnet MG b is magnetically excited with direct current, the attraction force does not pulsate as shown by the attraction force characteristic curve F, and when it generates an attraction force that is larger than the load reaction force,
Electromagnet MGb does not generate noise.

As described above, if the electromagnets MGb and MGa are designed in a well-balanced manner, it is possible to save energy after attraction, and moreover, it is possible to achieve noiseless DC excitation.

As described above, this electromagnet device mechanically connects electromagnets MGa and MGb that are magnetically insulated from each other, and excites one of the electromagnets MGai with alternating current, and this electromagnet M
G, and the other electromagnet MGbt electrically connected in series.
It is configured to be DC excited, and when the electromagnet is turned on, the power supply voltage is applied to the DC excitation coil, and after attraction, it is attracted and held by the attraction force of the two types of electromagnets MGa + MGb, and the respective impedances are Since the circuit current limited by the vector sum of ZB y Zb can be reduced, it is possible to save energy after attraction, and since the attraction force due to DC excitation is applied, the electromagnet can be made noiseless. An extremely reliable product can be obtained.

[Invention @rice]

As explained above, the present invention provides a highly reliable system that can eliminate noise generation and reduce apparent power consumption and power consumption during operation to save energy.
You can get good deals on magnet equipment.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a conventional electromagnet, Figure 2 is a diagram showing the gap between the fixed core and the movable core in an electromagnet that is excited by AC, and the attraction force characteristic curve. 4
．． Figure 4 is a configuration diagram showing the hyalonic equivalent circuit of a Ti1 stone.
Figures 8 and 8 are diagrams showing the attraction force characteristics that act on the movable core and fixed 1 after completion of attraction of the conventional city magnet and the Ti magnet of the present invention, and Figure 6 shows an example of the present invention. FIG. 7 is a block diagram showing a typical equivalent circuit of the Himi 1 and Suri electromagnets. 1 + 1 a, 1 b---fixed core, 2.2a
+2b--s"':'1il, 3.3a, 3b...n
J moving iron core, 4-(cross coil, 5a+5b... magnetic pole part, A w B re, E, F, G... attractive force characteristic curve, D... load reaction force, No. 3... alternating or directing Conversion equipment, 1
4.15... air gap or non-magnetic material, 16g, 16b
...Yoke, MG, MGa, MGb...Electromagnet,
a, b...input terminals,! ...Void. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 'z*l (mm) Figure 1 Figure 5 6 Electrical angle (&) Figure 6 Figure 7 Figure 8 Electrical angle (&) 1

Claims (1)

[Claims] By energizing the coil wound around the fixed core,!
l) FIJ moving iron core "c" (In an electromagnet that attracts iH air, full AC power is applied to a series circuit in which the first coil is connected to the DC terminal side and the second coil is connected in series to the AC terminal side of the text conversion device. The first fixed iron core around which the first coil is wound and the second fixed iron core around which the second coil is wound are insulated by 718 degrees and mechanically connected, An electromagnet device characterized in that the first and second movable cores, which respectively face the second fixed core, are also magnetically insulated and mechanically connected.