A method of using a single-turn absolute encoder to realize power-off position memory

Abstract

The invention discloses a method for realizing power-off position memory through utilizing a single-turn absolute value encoder. The single-turn absolute value encoder, a main controller and a standbypower are further comprised, wherein the main controller comprises a turn number counting module, a position information processing module, a data storage module and a power-off det ection module. The method comprises steps of power-off detection and power-off position information storage and recovery operation. The method is advantaged in that multiple turns of absolute position can be recordedthrough only one ordinary single-turn absolute value encoder, influence of the number of turns and power-off influence are avoided, not only can a problem that the number of measurement turns in a multi-turn absolute value encoder in the prior art is limited be solved, but also a bottleneck problem that the single-turn absolute value encoder in the prior art cannot realize power-off position memory is further solved, memory and recovery of the power-off position can be achieved, whether the power supply is short-term or long-term, the method can be applied, moreover, the method is simple, easy to implement and low in cost of use.

Description

technical field [0001] The invention relates to a method for realizing power-off position memory by using a single-turn absolute value encoder, and belongs to the technical field of encoders. Background technique [0002] A rotary encoder is a device for measuring the position of the motor shaft or the rotational speed of the motor shaft. It can be divided into incremental and absolute values ​​according to the encoding form, and can be divided into single-turn and multi-turn according to the recording method. At present, multi-turn absolute value encoders are used more, because the existing multi-turn absolute value encoders are composed of a single-turn absolute value grating or a magnetic grid plus a multi-turn counting mechanism of a gear, and its biggest advantage is It can provide absolute position information and is not affected by power failure, but its stroke is limited by the number of turns, and the measurement range is limited, and the more turns, the more comple...

AI Technical Summary

Problems solved by technology

At present, multi-turn absolute value encoders are used more, because the existing multi-turn absolute value encoders are composed of a single-turn absolute value grating or a magnetic grid plus a multi-turn counting mechanism of a gear, and its biggest advantage is It can provide absolute position information and is not affected by power failure, but its stroke is limited by the number of turns, and the measurement range is limited, and the more turns, the more complex the structure, the larger the volume, and the higher the cost. Facilitate integration and miniaturization

Although the structure of the single-turn absolute encoder is simple, the cost is much lower than that of the multi-turn absolute encoder, but the disadvantage is that it can only record the absolute position within one turn

[0003] The invention patent application with the application number CN201710678148.4 discloses a multi-turn absolute value encoder, which uses a single-turn absolute value encoder for position detection during normal power supply and records position data by a single-chip microcomputer during normal power supply , 1 ordinary encoder is used for position detection when power is off, and another low-power single-chip microcomputer continues to record position data after power off, although this patented solution can solve the existing multi-turn absolute value encoder due to the gear ring The limitation of the number leads to the problem that the measurement range is limited, but this patent requires 2 encoders and 2 single-chip microcomputers, which not only has a complex structure, but also has a high cost, especially the low-power single-chip microcomputer still needs additional continuous power supply to work, so this The patented solution is not suitable for occasions where the power supply is interrupted for a long time, and cannot realize the memory and recovery of the power-off position