JPS6017902A - Method of correcting output of noncontact potentiometer - 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 force method for correcting the output of a non-contact potentiometer, in which the output of a pair of magnetoresistive elements, which changes with the relative movement of a yoke, is adjusted to a straight line as much as possible. A non-contact potentiometer that uses a magnetoresistive element is designed to cause a change in direct proportion to the
The present applicant has previously proposed a non-contact potentiometer that achieves high measurement accuracy (Japanese Patent Application No. 58-33134), which has come to be widely used in various fields.

To describe the gist of the present invention with reference to Figs. A yoke 5 made of a soft magnetic material is placed between the magnetoresistive elements 3.4 with a fixed arrangement and a fixed gap between the two magnetoresistive elements 3.4.
Placed opposite.

Both magnetoresistive resistors 8.4 and the yoke 5 are configured to be moved relative to each other along a fixed line while maintaining the fixed gap.

This non-contact potentiometer can accurately measure large displacements, has a simple configuration, and can be made compact. As can be understood from the above, the magnetic flux distribution form from the permanent magnet that passes through both magnetic resistance elements 3 and 4 varies to some extent depending on the performance of both magnetic resistance elements 3 and 4, especially in the non-contact type. The output change due to the relative displacement with the yoke 5 was not linearly and directly proportional, and the output linear shape was supposed to draw an irregular lateral curve.

The present invention solves the deficiencies and inconveniences of the above-mentioned non-contact type potentiometer.1] The present invention is an output correction force method devised to solve the deficiencies and inconveniences in the above-mentioned non-contact type potentiometer. It is configured to change locally.

Embodiments of the present invention will be described below with reference to Figure 4, but
The same reference numerals as those in FIGS. 1 and 2 indicate the same parts.

The output correction force method of the present invention is applied to a part of the yoke 5.

An auxiliary yoke 5a made of a piece-like soft magnetic material is provided to locally change the magnetic flux distribution form from the permanent magnet l passing through both magnetoresistive resistors 3 and 4, thereby increasing the output of both magnetoresistive resistors 3 and 4. It corrects the linearity.

Since the variation form of the output of the angry air resistance element differs depending on the performance of each individual regulator, the position of the attachment of the auxiliary yaw 521 to the yoke 5 is not necessarily constant and may be adjusted depending on the situation. This makes it possible to increase or decrease the magnetic resistance in a local part of the yoke 5.

Figure 41. FIG. 5 shows a non-contact type potentiometer of the fixed displacement type, which is an embodiment of the p-body structure of the modified force method, in which the shaft 7 can be slid freely on the end wall of the box-shaped case 6. The slider 8 is attached to the tip of the shaft 70 located inside the case 6.

This slider 8 is slidably assembled without wobbling on two guide shafts 9 installed between both end walls of the case 60 parallel to the axis of the shaft 7.

A permanent magnet 1 with magnetic resistance elements 3 and 4 arranged and fixed on the upper surface is fixed on the upper surface of the main body part in the case 6, and a permanent magnet 1 is fixed on the lower surface of the slider 8 in the direction of movement of the slider 8. On the other hand, a yoke 5 is fixed so as to be inclined at a predetermined angle and face the magnetoresistive resistors 3 and 4 with a constant gap.

The slider 8 is provided with an elongated hole 10 that is shorter in length than the yoke 5 and wider in width than the yoke 5, corresponding to the inclined posture of the yoke 5.

In such an Mli, the auxiliary yoke 5a is fixed at a predetermined position on the upper surface of the yoke 5 in the window hole 10 of the yoke. 1 resistance resistor 3,4
When the yoke 50 is moved relative to the yoke 50, the output of both magnetoresistive resistors 3.4 changes, and the change in resistance value can be measured. Since the output of the resistor can be corrected, the magnetic flux distribution form from the permanent magnet l passing through the magnetic resistance elements 3 and 4 will vary in direct proportion to the movement of the yoke 5, allowing extremely accurate measurement. Figures 6 and 7 show an embodiment of a rotary displacement type non-contact potentiometer, with a circular box-shaped case 6.
A shaft 7 is rotatably inserted through the center of the shaft 7, and a holding disk 1 is attached to the portion of the shaft 7 located inside the case 6.
Notches 12 are cut into the circumferential edge of the holding disk 110 at equal intervals.A magnetoresistive element is mounted on the upper surface of the circumferential edge of the weighted part in the case 6. 3.4 are arranged and fixed, and the lower surface of the circumferential end of the holding disk 110 has a helical curve so as to face both the string resistance resistors 3 and 4 with a constant gap. The yoke 5, which has a ring structure along the axis, is fixed. Therefore, as the amount of rotation of the shaft 70 changes, the positions of both magnetoresistive elements 8.4, which the yoke 5 faces, change, and the output fluctuates.

Even in this case, the magnetic flux distribution form from the permanent magnet l passing through the two magnetoresistive elements 3 or 4 does not necessarily vary in direct proportion to the movement of the yoke 5, depending on the performance of each magnetoresistive element. The auxiliary yoke 5a is fixed to any predetermined location on the upper surface of the yoke 5 exposed through the notch 12 of the disk 11, and the output of the magnetic resistance in a local part of the yoke 50 is corrected.

Note that the location where the auxiliary yoke 5a is fixed to the yoke 5 is determined by the performance of each magnetoresistive element employed as described above. If the output amount of the pixel element 3.4 is too small relative to the amount of relative movement between the yoke 5 and the yoke 5, an auxiliary yoke 5a is placed at that local portion of the yoke 5 to increase the magnetic flux. On the other hand, when the output i'' is too large, the magnetic flux is dispersed by the auxiliary yoke 5a. That is, the magnetic flux is controlled by fixing the auxiliary yoke 5a.

Therefore, according to the present invention, an auxiliary yoke is provided in a part of the yoke to locally change the form of magnetic flux distribution from the permanent magnet passing through both magnetoresistive transducers, and the output linear shape of one magnetoresistive transducer is corrected. Therefore, the output of the five magnetoresistive elements is extremely L-line-like, and it changes in proportion to the relative displacement i- with the yoke.
It has advantages such as being able to obtain a high degree of measurement accuracy and having a simple configuration.

[Brief explanation of the drawing]

1 and 2 show the basic configuration of a non-contact potentiometer according to the present invention. FIG. 1 is a top view showing the form of displacement operation, and FIG. 2 is a plan view thereof. FIG. 3 is a graph showing the output linearity of a pair of magnetic resistance elements. FIG. 4 shows an embodiment of the present invention, and FIG. 4 shows a plan view, and FIG. 5 shows a sectional view. FIG. 6 (and FIG. 7 show another embodiment of the present invention)
FIG. 6 shows a plan view, and FIG. 7 shows a sectional view. Explanation of symbols l; Permanent magnet, 2; Element stand-3*4: Magnetoresistive cable, 5
Yoke, 5a; Auxiliary yoke, 6; Case, 7; Shaft, 8; Slider, 9; Guide shaft. 10; Window hole, 11; Retaining disc, 12; Notch. Applicant Ensoki Co., Ltd. Nubu ν'4〃 (a) (b) (c) (a) (b) (c) Numpu'7 Kusag70 /'5P/~5, "77 Onion = 10-

Claims (1)

[Claims] ffi- and a second magnetoresistive element arranged and fixed on the magnetic pole face of a single permanent magnet, and a yoke made of a soft magnetic material,
The non-contact potentiometer is arranged to face each other with a certain narrow gap and move both the ventilation resistors and the yoke relative to each other along a certain linear line while maintaining the certain gap. An auxiliary yoke made of a soft magnetic material that locally changes the magnetic flux distribution shape WiA from the permanent magnet passing through both the magnetic resistance elements is provided in part, thereby modifying the output linear shape of the magnetic resistance elements. Contact potentiometer output correction force method.