A method for measuring the position of a linear motor mover

Abstract

The invention discloses a method for measuring the position of a mover of a linear motor, which is characterized in that a reference image with a gradual change in gray value is constructed on the base of the linear motor, and a camera fixed on the mover of the motor continuously shoots the reference image, and then the acquired Two adjacent images are sampled multiple times in a single line, and each single line sampling extracts the image information of the two images corresponding to the same line. For each single line sampling, the two single line images are obtained based on the singular value decomposition SVD phase correlation algorithm to solve the two The translation value of a single row of images along the moving direction of the motor mover is calculated, and then the multiple translation values ​​obtained are counted to obtain the most accurate translation value, and then the displacement and speed of the motor mover are calculated. The multi-sampling single-line simultaneous processing of the present invention is suitable for parallel processing of hardware and is easy to realize. The present invention is used to realize the precise measurement of the position of the linear motor mover, and can ensure the real-time performance and anti-interference performance of the measurement process.

Description

technical field [0001] The invention relates to a method for detecting the position of a mover of a linear motor, in particular to a new method for measuring the position of a mover of a linear motor based on an image algorithm. Background technique [0002] In the ultra-precision manufacturing system, the linear servo system has been more and more widely used due to its high precision, high acceleration and large stroke. The accuracy of the linear servo control system determines the manufacturing accuracy, while the accuracy and real-time performance of position detection directly affect the accuracy of servo control. Therefore, it is very important to study the real-time high-precision detection method of the position and speed of the linear motor mover in the linear servo system. [0003] At present, the detection of the displacement and speed of the mover of the linear motor at home and abroad mainly relies on hardware control or is measured by position sensors such as ...

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Problems solved by technology

[0003] At present, the detection of the displacement and speed of the mover of the linear motor at home and abroad mainly relies on hardware control or is measured by position sensors such as encoders, magnetic grids, and gratings. Encoders are mostly used for rotating motors with low precision; magnetic grid sensors In order to ensure the stability of the output signal of the magnetic head, the magnetic scale is in contact with the magnetic head, so it is easy to demagnetize and has a short service life; the grating sensor has high requirements on the working environment and cannot withstand large shocks and vibrations. In order to avoid dust, Pollution such as oil and iron filings must be sealed, and high-precision gratings are expensive and difficult to maintain; although laser interferometers can achieve the highest measurement accuracy among linear measurement devices, they are poor in vibration resistance and environmental interference , and the price is expensive, currently less used in machining sites

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