JPS60165016A - Method of regulating sensitivity of magnetic proximity switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting and setting the sensitivity of a magnetic proximity switch configured using a magnetoelectric transducer such as a Hall element. The purpose is to be able to accurately set and maintain the maximum operating distance of the switch.

There are seven possible circuit configurations for the magnetic proximity switch S that utilizes a magnetoelectric conversion element such as a ball element.
The circuit configuration shown in FIG. 1 is considered to be the most common.

In the circuit configuration example of the magnetic proximity switch S shown in FIG. 1, 1 is a magnetoelectric transducer, a constant voltage power supply 2 is inserted and connected between both input terminals of the magnetoelectric transducer 1, and One output terminal of the magnetoelectric transducer 1 is connected to the input terminal of the amplifier 3 to which the feed bank resistor R2 is connected via the resistor R1, and the other output terminal of the magnetoelectric transducer 1 is connected to the input terminal of the amplifier 3 to which the feed bank resistor R2 is connected. A differential amplifier 4 is connected to the other input terminal, and the output terminal of this amplifier 3 is connected to a differential amplifier 4 whose threshold value is set by two resistors R3 and R4 connected in series.
It is configured by connecting it to one input terminal of the.

This magnetic proximity switch S shown in FIG. After the change value is amplified by the amplifier 3, the difference value is compared with the threshold value of the differential amplifier 4 in the differential amplifier 4, and the output voltage of the magnetoelectric conversion element 1 is determined to be larger than the threshold value. When this happens, an ON signal is output to the differential amplifier 4.

In the magnetic proximity switch S having such a configuration,
As with other common detection switches, there is a need to be able to more accurately and freely set the ratings of the switch.

However, as is well known, there are extremely large variations in the ratings of the magnetoelectric transducer 1, and for this reason, in order to adjust the sensitivity of the switch, the magnetoelectric transducer 1 must be replaced with another magnetoelectric transducer with different sensitivity. The sensitivity has been adjusted by replacing the converter element 1 or by adjusting or changing the value of other electrical components 2 that make up the switch, such as resistance.

Both methods are not only cumbersome to operate.

Since the newly set sensitivity is not necessarily accurate and cannot be freely adjusted to increase or decrease, there have been many inconveniences and dissatisfaction, such as the fact that the sensitivity may not be adjustable.

The present invention was devised to eliminate the dissatisfaction and inconvenience in the conventional example described above, and uses three ferromagnetic materials to change and adjust the magnetic force acting on the magnetoelectric conversion element 1 from the drive magnet, which is a permanent magnet. This is what I did.

The present invention will be explained below with reference to the drawings.

The sensitivity adjustment method of the magnetic proximity switch S according to the present invention is based on the method of adjusting the sensitivity of the magnetic proximity switch S, as shown in FIG. This is achieved by positionally adjusting and arranging a ferromagnetic material 6 with a size adjusted to tJl on the surface side of the ferromagnetic material 6.

Magnetoelectric conversion element 1 and/or drive magnet 5 made of ferromagnetic material 6
As an example of the assembly, as shown in the embodiment shown in Fig. 3,
An example of the configuration assembled into the magnetoelectric transducer 1, an example of the configuration assembled with the drive magnet 5 as shown in the embodiment shown in FIG. There is a configuration example as shown in the figure.

In the case of the embodiment shown in FIG. 3, the amount of magnetic lines of force F of the driving magnet 5 passing through the magnetoelectric conversion element 1 is smaller than that in the case shown in FIG. 2, in which the ferromagnetic material 6 is not used.

The number increases by the amount that is attracted to the ferromagnetic material 6, and the sensitivity of the switch increases accordingly.

Of the magnetic flux from the driving magnet 5 passing through the magnetoelectric conversion element 1,
The magnetic flux that is attracted to this ferromagnetic material 6 and increases, because the size and shape of this ferromagnetic material 6 and its assembly to the magnetoelectric transducer 1 change depending on the positional relationship. Alternatively, by adjusting and setting each, the sensitivity of the magnetic proximity switch S can be freely set and determined.

Further, the location where the first ferromagnetic material 6 is attached is not limited to the embodiment shown in FIG. 3, but may be attached to the driving magnet 5 as shown in FIG. 4.

In the embodiment shown in FIG. 4, the ferromagnetic material 1 is the driving magnet 5.
(the surface opposite to the side facing magnetoelectric conversion element 1)
, the lines of magnetic force F from the drive magnet 5 toward the back are suppressed, and as a reaction to this, the lines of magnetic force F extend toward the magnetoelectric transducer 1 side, which causes the Schiff magnetoelectric transducer 1 to The number of magnetic fluxes passing through from the driving magnet 5 will be increased compared to the case shown in FIG.

Furthermore, when a ferromagnetic material 6 is assembled to both the magnetoelectric transducer 1 and the drive magnet 5 as shown in FIG. 5, the effect of the embodiment shown in FIG. 3 and the effect of the embodiment shown in FIG. is added, so the increase in the number of magnetic fluxes from the drive magnet 5 passing through the magnetoelectric conversion element 1 is the largest, and the largest increase in sensitivity can be achieved.

A specific example of increasing the sensitivity of the magnetic proximity switch S according to the present invention will be explained with reference to FIGS. 6 and 7.

In FIG. 6, the driving magnet 5 has the following dimensions.

8 × 8 × 121all, 1 surface magnetic flux density is 1
．． 5KG, but the maximum sensitivity distance of this magnetic proximity switch S was 11 degrees.

When a ferromagnetic material 6 using a 5PCC board with one dimension of 1010x6x1 is assembled on the back side of the magnetoelectric conversion element 1 of the magnetic proximity switch S shown in FIG.
The maximum sensitivity distance in the switch S was 13 steps, confirming that the sensitivity of the magnetic proximity switch S was enhanced.

In this way, the method for adjusting the sensitivity of the magnetic proximity switch S according to the present invention involves modifying the electrical components that make up the circuit of the magnetic proximity switch S that has been assembled into a single assembly, so that the sensitivity of the magnetic proximity switch S can be adjusted accurately and reliably. can be adjusted to

Further, the sensitivity adjustment operation of the magnetic proximity switch S is easy to perform because it is only necessary to assemble the ferromagnetic body 6 to the drive magnet 5 or the magnetoelectric transducer 1.

Furthermore, by adjusting and setting the assembly position and size of the two-ferromagnetic body 6, the sensitivity adjustment amount of the two-magnetic proximity switch S can be freely set, and a desired sensitivity can be obtained depending on dirt.

Incidentally, there are several well-known methods for adjusting the sensitivity of magnetic proximity switches. In this method, the sensitivity of the switch is adjusted using the bias magnet 7. However, when adjusting the speed of a non-contact magnetic switch using such a bias magnet, the fixed position of the bias magnet 7 is Due to a slight change in the amount of bias magnetic flux or thickness m
It changed to l, making it difficult to make fine adjustments. Here, the ferromagnetic material 6 is placed on the back side of the driving magnet 5 as shown in FIGS. 11 and 12.
9 as shown or on the front or back of the bias magnet 7.
By attaching the switch as shown in Figures and Figure 10, making rough adjustments using the bias magnet 7, and then making fine adjustments using the ferromagnetic material 6, it is now possible to manufacture highly accurate switches with little variation. .

In addition, in Japanese Patent Application No. 57-22477 ``Operation Method of Non-Contact Magnetic Switch and Non-Contact Magnetic Switch Device'', the applicant Nippon O-I-Mation Co., Ltd.
D is omitted.F is a non-contact magnetic switch body that turns ON due to the flux action and turns OFF due to the magnetic flux action of the magnetic flux density B1. Bl<Bo<
A bias magnet is placed near the switch body in order to cause a magnetic flux with a magnetic flux density Bo that satisfies B to act during lightning, and a magnetic flux with a magnetic flux density of BON that satisfies B, L Bo≦BON, and Bo Bl≦ B O that satisfies B OFF
It is composed of at least one driving magnet that is displaceable with respect to the switch body so that the magnetic flux of the magnetic flux density FF acts separately, and the magnetic flux for switching the switch state is no longer affected. The purpose of the present invention is to self-maintain the switch state of the switch body in the state where the above-described magnetic flux is applied.

Furthermore, according to Japanese Patent Application No. 57-81080 "Non-contact magnetic switch device" filed by Nippon O-Mation Co., Ltd., when the magnetic flux density acting on a non-contact magnetic switch from the outside exceeds Bl (unit omitted), ONL , a switch that turns off when the magnetic flux density becomes less than or equal to B1, which is smaller than B2, a bias magnet that is placed near this switch and whose magnetic flux density that acts on the switch body is greater than or equal to B2, and a bias magnet that is displaced relative to this bias magnet and The object is to create a non-contact magnetic switch body that is configured to consist of a magnet and a drive magnet with opposite magnetic poles, and can cause the switch body to perform a switching operation using a smaller drive magnet. Then, bring the drive magnet close to the switch body,
Arranged so that it can be moved away.

In other words, a bias magnetic flux is applied to the switch body to keep it in the ON state, and the magnetic flux from the drive magnet is intended to act in the opposite direction to this bias magnetic flux. Fine adjustment is also easily possible using the method described above.

As is clear from the above explanation, (1) the method for adjusting the sensitivity of a magnetic proximity switch according to the present invention requires no modification to the circuit structure of the magnetic proximity switch (5) and simply assembling the ferromagnetic material; The operation and man-hours are extremely simple and require less man-hours, and not only can a large amount of sensitivity adjustment be obtained, but also fine adjustment of the sensitivity can be achieved easily and accurately. Since the sensitive distance can be obtained, the overall size of the VA proximity switch can be significantly reduced, and many other excellent effects can be achieved.

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram showing the most typical circuit configuration of a magnetic proximity switch. FIG. 2 is an explanatory diagram showing the basic form of the magnetic flux action form from the drive magnet on the magnetoelectric conversion element. Figures 3 to 5 show an embodiment of the method of the present invention. Figure 3 is an explanatory diagram when a ferromagnetic material is assembled into a magnetoelectric conversion element, and Figure 4 is an illustration of a ferromagnetic material being attached to a driving magnet. FIG. 5 is an explanatory diagram when the ferromagnetic material is assembled to both the magnetoelectric conversion element and the drive magnet. 6 and 7 are used to explain a specific example of the method of the present invention. FIG. 6 is a diagram showing a state in which the method of the present invention is not carried out, and FIG. It is a figure which shows the implemented state. Explanation of symbols 1; magnetoelectric conversion element; 2; constant voltage power supply; 3; amplifier 4; differential amplifier; 5; drive magnet; 6; ferromagnetic material. S: Magnetic proximity switch, F: Line of magnetic force, 7: High-ass magnet. Applicant Nippon Automation Co., Ltd. + No. 71, No. 28, No. 7, No. 71, No. 28, No. 6, Procedural Amendment (voluntary), March 1980, Commissioner of the Japan Patent Office, Kazuo Wakasugi, 2 , Title of the invention: Sensitivity adjustment method for magnetic proximity switches 3, Relationship with the case of the person making the amendment Patent applicant Address: 2923 Hamakita Uchino, Shizuoka Prefecture Name: Japan Automation Co., Ltd. 4, Agent ■
164 Do 382-6771 Address: 2-25-8 Nakano, Nakano-ku, Tokyo Column 6 of the detailed description of the invention in the specification, Contents of amendment (1) "Speed" on page 7, line 120 of the specification ” to “Sensitivity J.” 59゜3,22 Procedural amendment (method) % formula % 2. Name of the invention Method for adjusting the sensitivity of a hydrogen proximity switch 3. Person making the amendment Relationship with the case Patent Applicant Address: 2923 Hamakita Uchino, Shizuoka Prefecture Name: Japan Automation Co., Ltd. 4゛9 Agent
8164 Yellow 382-6771 (generation) April 1980 0
4th (shipment date) April 24, 1980 6. Subject of amendment 7. Contents of amendment (1) On page 11 of the specification, line 11, next to "This is a diagram showing..." Insert the following sentence into . Figure 8 shows how the sensitivity of the switch is adjusted using a bias magnet, Figure 9 shows a ferromagnetic material attached to the front of the bias magnet, and Figure 10 shows a ferromagnetic material attached to the front of the bias magnet. Figure 11 shows a ferromagnetic material attached to the back of a drive magnet, and another ferromagnetic material attached to the back of a bias magnet. Figure 12 shows a ferromagnetic material attached to the back of a bias magnet. It is a diagram showing a state in which another ferromagnetic material is attached to the back side of the drive magnet and the front side of the bias magnet.

Claims (1)

[Claims] A method for adjusting the sensitivity of a magnetic proximity switch, in which a ferromagnetic material of an adjusted size is positioned and arranged on the surface side of at least one of a magnetoelectric conversion element and a drive magnet that constitute the magnetic proximity switch, on the side that does not face the other. .