One-dimensional positioning method of motion platform based on linear magnetic steel array

A motion platform and magnetic steel array technology, which is applied in the direction of using electric/magnetic devices to transmit sensing components, etc., can solve the problems of complex circuits and optical equipment, high cost, and loss of measurement accuracy

Active Publication Date: 2010-07-07
TSINGHUA UNIV +1
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  • Abstract
  • Description
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Problems solved by technology

Although the components used in the above patented technologies have high measurement accuracy, they require more complex circuits and optical equipment and are more expensive.
In the actual movem

Method used

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  • One-dimensional positioning method of motion platform based on linear magnetic steel array
  • One-dimensional positioning method of motion platform based on linear magnetic steel array
  • One-dimensional positioning method of motion platform based on linear magnetic steel array

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Embodiment

[0046] The minimum number of the linear Hall sensors 5 placed on the motion platform 4 is determined by the number of unknown parameters contained in the linear magnetic steel array 2 magnetic flux density distribution model, and on this basis, the more the number of placed The more, the more beneficial it is to reduce the uncertainty of the motion platform 4 phase solution results, therefore, n is at least equal to 2.

[0047] refer to image 3 In the following, two linear Hall sensors 5 (ie n=2) are placed on the moving direction of the surface of the moving platform 4, and the unscented Kalman filter algorithm is used as an example to describe the present invention, so as to further understand the present invention.

[0048] 1) Select any two different positions within one pole pitch of the linear magnetic steel array 2 on the surface movement direction of the motion platform 4 in the motion system, and place a linear Hall sensor 5 at each position;

[0049] 2) Determine t...

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Abstract

The invention discloses a one-dimensional positioning method of a motion platform based on a linear magnetic steel array, which comprises the following steps: placing more than 2 linear Hall sensors in arbitrary and different positions within one or more polar distances on the linear magnetic steel array in the motion direction of the surface of the motion platform in a motion system, determining a magnetic flux density distribution model according to the linear magnetic steel array, determining the mounting positions of the linear Hall sensors and converting into a phase relative to the mass center of the motion platform, recoding magnetic flux density measured values of the linear Hall sensors in the motion process, solving the phase of the mass core of the motion platform in the motion direction by taking the measured values as observed values and taking the magnetic flux density distribution model as a calculation value, and then determining the position of the mass core of the motion platform relative to an initial phase according to the phase, thus realizing the one-dimensional positioning of the motion platform. The invention provides the easy, convenient and robust method for calculating the position of the one-dimensional mass core of the platform for the motion system which contains the linear magnetic steel array.

Description

technical field [0001] The invention relates to a measurement method of a moving part including a linear magnetic steel array, in particular to a measurement method using a linear Hall sensor, which belongs to the technical field of measurement and data processing. Background technique [0002] Linear motor is an electromagnetic device that directly converts electromagnetic energy into linear motion mechanical energy. It has the advantages of simple structure, high positioning accuracy, and fast response speed. It can directly drive the workbench, thus eliminating the gap between the drive motor and the workbench. All the intermediate transmission links of the drive, thus overcoming the shortcomings brought by the transmission link of the traditional drive mode, so it is widely used in many fields such as industrial linear drive, transportation, military equipment and so on. [0003] In the motion system using linear motors, high-precision grating rulers are generally used a...

Claims

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Application Information

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IPC IPC(8): G01D5/12
Inventor 胡金春朱煜汪劲松尹文生张鸣杨开明徐登峰廖凯段广洪张利
Owner TSINGHUA UNIV
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