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Composite type rotary encoder and measurement method thereof

A rotary encoder and composite technology, applied in the field of rotary encoders, can solve the problems of binary code disc production error, increasing n value, code track advance or delay, etc.

Inactive Publication Date: 2015-03-25
NANTONG DUOQIAN NEW MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Incremental encoders can only provide information about the current position relative to the previous position. After the power is interrupted, the information change of the position must be reset to zero before it can be confirmed. At the moment when the power is turned on again, the incremental encoder The server cannot immediately know the current location of the organization
In addition, the grating code disc of the incremental encoder is a circular grating disc with several rectangular holes equally divided on a circular plate with a certain diameter, and the grating code disc of the absolute encoder is radially arranged on the grating plate. A number of concentric tracks, each track is composed of light-transmitting and opaque fan-shaped areas alternately, both of which use circular grating code discs, because the grating code discs of both are depicted on a circular plane perpendicular to the axis of the motor, and the motor In the process of operation, it is inevitable that a certain radial runout will be generated due to vibration, which may cause a small displacement of the code track of the grating code disc. When the radial displacement caused by vibration reaches a certain amplitude, the reading of the encoder may be Errors that affect the accuracy of the measurement results
[0004] Moreover, the encoder disks of photoelectric rotary encoders are all encoded with gratings, which have high requirements for grating writing technology, such as absolute binary encoder disks, n-bit binary code disks have 2 n different codes, the minimum resolution is θ=360° / 2 n , to improve the resolution of the code disc, the value of n must be increased
However, increasing the value of n will definitely cause great difficulties in the production of code discs.
At the same time, the slight manufacturing error of the binary code disc will lead to the advance or delay of individual code channels, which will cause the error of the output signal
In addition, for the circular grating encoder disk, in order to improve the subdivision accuracy of Moiré fringes, the method of increasing the density of the grating lines or placing more photosensitive elements to achieve a higher subdivision of the signal is currently more common It is to describe 50-100 grating lines in the range of 1mm, but it is impossible to accurately place multiple photosensitive elements under a certain phase difference
In general, in the current technology, due to the limitation of the grating writing technology, the accuracy of the photoelectric rotary encoder is also greatly limited.

Method used

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  • Composite type rotary encoder and measurement method thereof
  • Composite type rotary encoder and measurement method thereof
  • Composite type rotary encoder and measurement method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0084] refer to Figure 1~Figure 5 , a composite rotary encoder, used to measure the rotation angle of the servo motor, including an optical system, a circular encoder ring 17, a rotating shaft 14, a data acquisition module 15 and a data processing unit 16, the optical system includes a plurality of uniformly distributed The light source module 1 on the surface of the rotating shaft 14, the circular encoding ring 17 is fixed on the frame of the servo motor, the rotating shaft 14 is connected with the servo motor through a brush and is located in the circular encoding ring 17, the circular encoding ring 17 and the rotating shaft 14 It is coaxially installed, and the circular coding ring 17 is provided with a plurality of relative code tracks and a plurality of absolute code track groups in turn on the inner surface 3 of the ring parallel to its axis;

[0085] A plurality of relative code tracks includes multiple groups of photoelectric sensors 4 evenly distributed around the ci...

Embodiment 2

[0100] A method for measuring a composite rotary encoder in Embodiment 1, comprising:

[0101] S1. Install a rotary encoder on the servo motor to be tested;

[0102] S2. The rotating shaft 14 of the rotary encoder rotates under the drive of the servo motor, so that the light emitted by the light source module 1 scans and irradiates a plurality of relative code tracks and a plurality of absolute code track groups on the circular encoding ring 17;

[0103] S3. The photoelectric sensor 4 on each relative code track successively senses light under the irradiation of light and generates a group of time sequence pulse signals, and the photoelectric sensor 4 on each absolute code track successively senses light under the irradiation of light and generates a group of coded pulse signals;

[0104] S4, the data acquisition module 15 collects the timing pulse signal and the encoded pulse signal and sends it to the data processing unit 16;

[0105] S5. The data processing unit 16 counts ...

Embodiment 3

[0113] This embodiment is basically similar to Embodiment 2, the difference is that step S5 is specifically:

[0114] The data processing unit 16 counts the timing pulses in the timing pulse signal after receiving the timing pulse signal, and calculates the rotation angle of the servo motor after obtaining the real-time count total value K, and then calculates the rotation speed of the servo motor;

[0115] After the data processing unit 16 receives multiple sets of coded pulse signals, according to the calculated rotational speed of the servo motor, select the coded pulse signal of the absolute code channel group corresponding to the rotational speed, and then count the coded pulses in the coded pulse signal Obtain the real-time quantity of encoding pulses, and judge whether the multiple relationship between the real-time quantity and the real-time count total value K is equal to the quantity multiple relationship between the corresponding absolute code track and the photoelec...

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Abstract

The invention discloses a composite type rotary encoder and a measurement method of the composite type rotary encoder. The composite type rotary encoder comprises an optical system, a circular coding ring, a rotating shaft, a data collecting module and a data processing unit. The optical system comprises a plurality of light source modules evenly distributed on the surface of the rotating shaft, the circular coding ring and the rotating shaft are coaxially installed, and a plurality of relative code ways and a plurality of absolute code way sets are sequentially arranged on the circular ring inner side face of the circular coding ring. The distances between photoelectric sensors of the relative code ways are equal, the distances between photoelectric sensors of a plurality of absolute code ways of each absolute code way set are equal, and the distances between the photoelectric sensors of the absolute code way sets are gradually increased according to position relations. The relative code ways and each absolute code way are independently connected with the data collecting module, and the data collecting module is connected with the data processing unit. The composite type rotary encoder and the measurement method of the composite type rotary encoder are capable of avoiding measurement errors caused by radial jumps, high in measurement precision, high in anti-interference capability and anti-pollution capability, high in reliability and capable of being widely applied to the field of measurement of rotating angles.

Description

technical field [0001] The invention relates to the field of rotary encoders, in particular to a composite rotary encoder and a measuring method thereof. Background technique [0002] The motor of an AC servo motor is usually equipped with a photoelectric rotary encoder to measure the rotation angle of the motor. The photoelectric rotary encoder can obtain the rotation angle of the rotor to obtain the motor speed information, and the speed information can be fed back to the relevant speed control unit to accurately control the motor. At the same time, the movement displacement, speed, acceleration and other information of the actuator can be calculated indirectly. The positioning accuracy of the servo motor depends on the resolution of the encoder. Photoelectric rotary encoder is a sensor that converts the mechanical geometric displacement on the output shaft into pulse or digital quantity through photoelectric conversion. It is currently the most widely used sensor in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347G01B11/26
Inventor 王新力
Owner NANTONG DUOQIAN NEW MATERIAL SCI & TECH CO LTD
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