Absolute optical code wheel as well as absolute coder and method for detecting absolute position thereof

An absolute encoder and absolute position technology, used in measuring devices, instruments, and converting sensor output, etc., can solve problems such as wasting time, improve position accuracy, and eliminate common mode noise.

Active Publication Date: 2009-11-04
DELTA ELECTRONICS INC
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  • Claims
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AI Technical Summary

Problems solved by technology

The advantage of an incremental encoder is that only six signals are needed to obtain high-resolution position information. The disadvantage is that it is necessary to return to the origin every time the power is turned on, which not only wastes time but also does not allow returning to the origin In the application of the program, the incremental encoder cannot meet the requirements and an absolute encoder needs to be added.

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  • Absolute optical code wheel as well as absolute coder and method for detecting absolute position thereof
  • Absolute optical code wheel as well as absolute coder and method for detecting absolute position thereof
  • Absolute optical code wheel as well as absolute coder and method for detecting absolute position thereof

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Embodiment Construction

[0067] At present, most absolute encoders use the physical position coding method to provide absolute position information. The commonly used coding methods include binary code (Binary Code) and Gray code (Gray Code). Whether it is binary code or Gray code, the encoder The resolution accuracy depends on the number of sensing components, the more the number of sensing components, the larger the volume of the encoder and the higher the cost. The main purpose of the present invention is to utilize the structure of the incremental encoder to realize the function of the absolute encoder, only need to add a group of modulating signal (modulating signal) in the original code disc of the incremental encoder, just can produce A set of sine and cosine signals with a period of 360 degrees, using the set of sine and cosine signals, the absolute position information at any moment can be interpolated.

[0068] see Figure 5A , is a schematic diagram of the rotary code wheel 100 (that is, t...

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Abstract

The invention relates to an absolute optical code wheel as well as an absolute coder and a method for detecting the absolute position thereof. The absolute coder comprises the absolute optical code wheel, and the absolute optical code wheel comprises a main raster unit and two auxiliary raster units; the two auxiliary raster units are respectively positioned at two sides of the main raster unit, and the raster numbers of the two auxiliary raster units are one less than that of the main raster unit. When the absolute coder is used for detecting the absolute position, the absolute optical code wheel can be rotated so as to find out optical detection signal zero points of the auxiliary raster units and also numerical values corresponding to the zero points of the main raster unit, thereby the absolute position can be derived. As the absolute coder can provide the calculation of an increment position and the absolute position simultaneously, the using elasticity can be increased.

Description

technical field [0001] The present invention relates to an absolute encoder and an operating method thereof, in particular to an absolute optical encoder wheel utilizing an incremental encoder architecture, an absolute encoder and a method for detecting absolute positions thereof. Background technique [0002] The known AC servo motor usually includes an optical encoder, which provides the angle of the rotor to obtain the motor rotation speed information, and the rotation speed information can be fed back to the related speed control unit to precisely control the motor rotation speed. [0003] figure 1 It is a block diagram of a conventional AC servo motor control system. The angular position of the rotor of the motor 10 is detected by the optical encoder 12 and processed by the signal processing unit 20 to obtain angular information. The angle information is sent to the controller 14 for processing to obtain the estimated rotational speed of the motor, and then the speed c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
Inventor 欧阳盟苏暐凯许宏成
Owner DELTA ELECTRONICS INC
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