Moving magnet type absolute position detection device and method

Abstract

The invention relates to a moving magnetic type absolute position detection device and method. The detection device comprises a moving magnetic head, a sensor acquisition board and a signal calculation module, the moving magnetic head is installed on a moving component at a to-be-detected position, linearly moves along with the moving component, and is composed of three rows of permanent magnet arrays formed by combining a plurality of permanent magnets according to a specific coding and arrangement mode. The sensor acquisition board is fixed below the moving magnetic head in parallel, provides a position reference and consists of a plurality of groups of three rows of linear magnetic sensor arrays which are arranged at equal intervals; and the signal calculation module is composed of a data processing unit, a storage module and a data communication module, collects signals of the magnetic sensor in real time and calculates absolute displacement information. According to the device, absolute position detection and unique coding can be carried out on the detected moving component under the condition of no cable constraint, the flexibility and the movement stroke of the position detection device are improved, displacement measurement and subdivision are carried out by adopting the three-axis linear magnetic sensor array, the measurement precision of the device is improved, and the cost is saved.

Description

technical field [0001] The invention belongs to the field of position detection, and in particular relates to a moving magnet absolute position detection device and method. Background technique [0002] In the field of intelligent manufacturing, the automatic production, processing, assembly and manufacturing of products depend on the precise positioning and feedback of position detection sensors in the control system. The structure and performance of the sensors directly affect the production efficiency and product quality of the automation system. In linear displacement measurement, the most commonly used is the position detection method using grating scale and magnetic scale. The grating ruler is a displacement measuring device made using the principle of light interference and diffraction. It is widely used in precision measurement and closed-loop servo control systems due to its advantages of high measurement accuracy, fast response speed and long life. The magnetic sc...

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Problems solved by technology

[0003] In industrial production, conventional grating scales or magnetic scales are used for linear displacement measurement, the cost is relatively high, and the sensor reading head is fixedly installed on the moving component, and the power supply and communication cables connected to the reading head will directly affect the motion unit. Motion stroke and performance, the layout of cables will complicate the structure of the control system and increase the cost of the system

In an industrial production system where multi-movement components cooperate, multiple sensors need to be used for position positioning and measurement. Conventional sensors cannot be uniquely numbered on the hardware, and cannot be flexibly configured and used

Patent CN 101915590B proposes a magnetoresistive array-based position detection system, which obtains the position of the motion unit by processing the unequal-distance magnetoresistive sensing components. This method needs to cooperate with multiple analog signal processing circuits and ADCs during displacement measurement For the converter channel, when measuring the position of a long stroke, the circuit is too complicated and the cost is high, which is difficult for practical application. When measuring the position of multi-moving components, it is impossible to distinguish the numbers of multiple moving components

Patent CN 111750904 A proposes a position detection device using a single-row magnetic sensor array, and multiple magnetic sensors are pre-selected for position detection. In the actual application process, when affected by external stray magnetic fields, the method will cause The detection accuracy is limited, and the detection device cannot meet the requirements for numbering and distinguishing multiple moving components

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