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Multirotation type encoder

An encoder and angle technology, applied in the direction of converting sensor output, instruments, measuring devices, etc., can solve the problems of complex mechanism, cost and time, and reliability reduction.

Inactive Publication Date: 2005-01-26
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the prior art has a mechanical multi-rotation transmission mechanism, in order to increase the reduction ratio, it is necessary to significantly increase the diameter of the driven gear relative to the diameter of the driving gear, which will cause the problem of excessive size of the equipment, and even with multi-stage To build a gear set with a small reduction ratio, there will also be problems with complex mechanisms and excessive equipment size
In addition, when the gears are meshed with each other, there is a problem that an error occurs in the rotation detector due to backlash or wear of the meshing surfaces, or there is a problem that the reliability is lowered
In addition, since the rotation angle is detected by counting the number of teeth of the gears of each stage, there arises a problem that electronic parts and a battery are required to store the counted value, and it takes cost and time to replace the battery periodically

Method used

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Examples

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no. 1 example

[0041] figure 1 A first embodiment of the invention is shown. figure 1 is a perspective view showing the multi-transform encoder of the first embodiment of the present invention. In the accompanying drawings, reference numeral 20 represents a first encoder for detecting an absolute value angle, reference numeral 30 represents a reduction mechanism, and this reduction mechanism 30 includes a first magnetic gear 31 and a second magnetic gear 32, and reference numeral 40 represents a second encoder , and reference numeral 41 denotes a first magnetic field detecting means. figure 2 The magnetic gear of the reduction mechanism 30 is shown. figure 2 (a) and figure 2 (b) shows respectively figure 1 The first magnetic gear 31 and the second magnetic gear 32 in the. Arrow marks in the drawings indicate magnetization directions. At the same time, the second magnetic gear 32 is magnetized at a plurality of places thereof in the circumferential direction.

[0042] The first m...

no. 2 example

[0049] Figure 4 A second embodiment of the invention is shown. Figure 4 is a perspective view showing a magnetic coupling portion including a magnetic gear of a second embodiment of the present invention.

[0050] The second magnetic gears 32 are provided with an air gap with respect to the first magnetic gears 31 in the axial direction so as to overlap each other. The first magnetic gear 31 is magnetized in the longitudinal direction of the rotating shaft, and has two magnetic poles. The second magnetic gear 32 is also magnetized in the longitudinal direction of the rotation shaft, and a plurality of magnetic poles are magnetized in the circumferential direction thereof. Therefore, when the parts having different polarities of the first magnetic gear 31 and the second magnetic gear 32 face each other, an attractive force acts therebetween, thus forming a transmission force, and the rotation of the first magnetic gear 31 is transmitted to the second magnetic gear 32. Sin...

no. 3 example

[0052] Figure 5 A third embodiment of the present invention is shown. Figure 5 is a perspective view of a multi-stage encoder showing a third embodiment of the present invention. In the figure, symbols 33, 33a, 33b, 33c represent the third magnetic gear, symbols 42, 42a, 42b, 42c represent the second magnetic field detection device, and symbols 50, 50a, 50b, 50c represent the magnetic gear for connecting the second 32 and the second rotating shaft of the third magnetic gear 33. All the magnetic gears are rotatably supported by the second rotation shaft 50 by bearings not shown. The third magnetic gear 33 is magnetized in one direction perpendicular to the rotation shaft 50 . In addition, two or more second magnetic field detection devices 42 are provided around the third magnetic gear 33 .

[0053] Next, a method of detecting the rotation angle of the second magnetic gear 32 will be described. When the third magnetic gear 33 and the second magnetic gear 32 rotate simult...

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Abstract

A multirotation type encoder that is small-sized, having no mechanical contact portion other than bearings, having high reliability and long life, requiring no battery exchange. This multirotation type encoder comprises a first encoder 20 attached to the rotary shaft 11 of a rotary machine 10 for detecting the absolute rotary angle within one revolution, and a second encoder 20 for counting the number of multi-rotation of the rotary shaft 11 by using a speed reduction mechanism 30 using a magnetic coupling, the second encoder 40 being composed of a first magnetic gear 31 connected directly to the rotary shaft and multipole-magnetized, and at least one second magnetic gear 32 disposed in non-contact opposed relation thereto and multipole-magnetized with more magnetic poles than in the first magnetic gear 31, it being arranged that the angle of rotation of the second magnetic gear is detected by the second encoder to count the number of multirotation.

Description

technical field [0001] The invention relates to a battery-free multi-turn encoder for detecting multi-turn rotation amounts of servo motors used in robots, machine tools, etc., using absolute value angles. Background technique [0002] exist as Figure 12 A prior art multi-transform encoder is shown. Figure 12 is a perspective view showing a prior art multi-transition encoder. In the drawing, reference numeral 10 denotes a rotary machine, reference numeral 20 denotes a first encoder and reference numeral 40 denotes a second encoder. The rotating shaft 12 of the first encoder 20 is connected to the driving gear 34a, and the driving gear 34a is meshed with the driven gear 34b. The gear 34b is connected to the second encoder 40 through the rotating shaft 13 . [0003] According to the multi-revolution encoder configured in this way, when the rotary machine 10 rotates, the number of rotations reduced according to the speed reduction ratio determined by the gear ratio of the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/04G01D5/245
CPCG01D5/245G01D5/04G01D5/2451G01D2205/28G01D2205/26
Inventor 椛岛武文松崎一成上村浩司长濑乔
Owner YASKAWA DENKI KK