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Offset correction circuit of encoder

An offset compensation and compensation circuit technology, applied in the field of encoders, can solve the problems of not getting the correct offset, large offset, etc.

Inactive Publication Date: 2007-08-22
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0035] Therefore, in the prior art, when the offset of at least one phase is large and the sampling period T2 is relatively small relative to the period of the input signal, there is a problem that the correct offset cannot be obtained

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  • Offset correction circuit of encoder
  • Offset correction circuit of encoder
  • Offset correction circuit of encoder

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Embodiment Construction

[0052] 6 is a schematic block diagram of an offset compensation circuit of an encoder according to an embodiment of the present invention. In this figure, the offset compensation circuit 60 indicated by the dotted line has an A-phase offset detection circuit 62A, a B-phase offset detection circuit 62B, and subtraction circuits 63A and 63B. The phases of the A-phase signal and the B-phase signal are about 90 degrees out of phase. A-phase signal is converted into digital signal A by A / D converter 61A D , are input to the A-phase offset detection circuit 62A and the B-phase offset detection circuit 62B. B-phase signal is converted into digital signal B by A / D converter 61B D , are input to the A-phase offset detection circuit 62A and the B-phase offset detection circuit 62B. A-phase offset detection circuit 62A and B-phase offset detection circuit 62B obtain offset values ​​Aofs and Bofs by the method described below from these A-phase and B-phase digital signals.

[0053] A-...

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PUM

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Abstract

The invention provides an offset compensation circuit for a coder. The coder can sample a first phase signal and a second phase signal with the phasic difference of 90 degrees at the same time, and detect angle signals according to A / D converted digital signals. The coder comprises an offset detection circuit; and a subtraction circuit. A second phase A / D converted value BD is used to get a second phase offset value Bofs, when a first phase A / D converted value AD is adjacent to a first value XA; the first phase A / D converted value AD is used to get a first phase offset value Aofs when the second phase A / D converted value BD is adjacent to a second value XB. When the next first offset value and the next second offset value are calculated, the first offset value Aofs got is used for calculation of the first value XA, and the second offset value Bofs got is used for calculation of the second value XB. The first offset value Aofs and the second offset value Bofs are used to compensate the offsets of the first phase signal and the second phase signal.

Description

technical field [0001] This invention is an improved invention of the applicant's patent No. 3026949 "Offset Compensation Circuit for Encoder", which relates to an encoder for position detection of motors or linear encoders used in NC machine tools and industrial robots The invention relates to an encoder, in particular to an offset compensation circuit for offset compensation of an encoder. Background technique [0002] A known method is to use a position detector to detect the amount of movement of the moving body as an analog quantity such as a sine wave or a cosine wave when calculating the amount of movement of the moving body as an angular amount, and to convert the detected analog amount into After the digital quantity is converted into an angle quantity by the encoder for calculation. [0003] In order to improve the resolution capability, the encoder detects two signals of A-phase signal and B-phase signal with phase deviation, and converts the two phase signals in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/12G01D5/245
CPCG01D5/2448
Inventor 谷口满幸菊地弘文松尾忠义
Owner FANUC LTD