Long-stroke position detection device and method

A detection device and long-stroke technology, applied in the direction of measuring devices, using electric devices, and using electric/magnetic devices to transfer sensing components, etc., can solve problems such as difficulty in ensuring uniformity of magnets and devices, complex circuits and cost, and limited detection accuracy. , to achieve low power consumption, high linearity, and reduce the number of channels

Active Publication Date: 2020-10-09
南京迅传智能工业技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Hall device is sensitive to unsaturated magnetic fields, and there must be harmonic components in the magnetic field of the magnet. It is also difficult to ensure a uniform air gap between the magnet and the device, and the superposition of the external stray magnetic field affects the detection accuracy of this method.
Patent CN 101915590 B proposes a magnetoresistive array-based position detection system, which obtains the position of the movable member by signal processing of the unequal-distance magnetoresistive sensing components, but this method is not suitable for long-stroke detection because each The magnetoresistive components need to be associated with the corresponding integrated circuits in multiple chip carriers, and a large number of analog signal conditioning and ADC converter channels are required under long strokes, resulting in circuits that are too complex and costly to be practically applied

Method used

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  • Long-stroke position detection device and method

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Embodiment 1

[0090] Taking a single detection circuit board composed of four magnetic sensor arrays as an example, when the permanent magnets are in different positions, the corresponding magnetic sensor gating and detection methods are described as follows Figure 5 Shown. The four magnetic sensors in the picture are marked as 1#, 2#, 3# and 4#, where 1# is the first magnetic sensor of the detection circuit board, and the center position of the corresponding sensor is L 1 , L 2 , L 3 And L 4 Is a known or calibrated position, position L 1 It is the coordinate zero point, corresponding to four sensor output curves. Taking the permanent magnets at the four positions of A, B, C and D as an example, the acquisition control process is as follows:

[0091] First, the sensors 1#, 2#, 3#, and 4# are sequentially selected and the initial position is detected, and then the continuous sampling process is entered. When the permanent magnet is in position A, the power supply and output signals of sensor ...

Embodiment 2

[0101] When multiple detection circuit boards are connected in series for long-stroke position detection, such as Image 6 As shown in the embodiment, the first detection circuit board 41 and the second detection circuit board 42 are spliced ​​end to end. The magnetic sensor 1# is the last sensor of the magnetic sensor array of the first detection circuit board 41, and the magnetic sensor 2# is the second detection. The first sensor of the circuit board 42 sensor array, the center position of the sensor is L respectively 1 And L 2 , Is a known or calibrated position, corresponding to two sensor output curves. Taking the permanent magnets at positions A and B in the middle of the two circuit boards as an example, the acquisition control process is as follows:

[0102] When the permanent magnet is in the A position, the detection circuit board 1 gates the sensor 1# and the adjacent sensor on the left side of the sensor power supply and output signal, and collects synchronously throu...

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Abstract

The invention relates to a long-stroke position detection device and method. The detection device comprises a permanent magnet and a detection circuit board. The permanent magnet is fixedly arranged on a movable component at a position to be detected and does linear displacement along with the movable component; the detection circuit board detects the position of the permanent magnet in real time.The detection circuit board is a PCB comprising a magnetic sensor array, a multichannel gating module and a microprocessor module. By adopting the magnetic sensor array, the influence of magnetic field harmonic waves and external stray magnetic fields on the detection precision is avoided, meanwhile, errors caused by uneven air gaps can be reduced, and the magnetic sensor array has the advantageof high linearity. By adopting the multichannel gating module and the microprocessor module, only analog signals output by the magnetic sensor array close to or about to be close to the current to-be-detected position are subjected to signal gating, the number of channels of a synchronous analog-to-digital converter and the complexity of a conditioning circuit structure are reduced while the real-time performance of detection is ensured, and low power consumption is achieved.

Description

Technical field [0001] The present invention relates to the field of long-stroke position detection, in particular to a long-stroke position detection device and method. Background technique [0002] In the field of industrial control, it is often necessary to accurately detect the position of movable components in a non-contact manner for closed-loop feedback of the system. In short-stroke position detection, this technology has developed more maturely, and detection components such as grating scales and magnetic scales have been widely used. However, in the field of long-stroke motion control, such as electromagnetic ejection devices, linear transmission devices based on segmented linear motors, etc., because their movable components are often passive, their position detection methods will be greatly restricted. Patent CN 109217767A aims at linear transmission system and proposes a linear displacement detection method based on grating or magnetic grating encoder, which places ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/14G01B7/00
CPCG01B7/00G01D5/14
Inventor 黄旭珍王安鹏黄倩丁徐哲
Owner 南京迅传智能工业技术有限公司
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