Linear motor rotor position measuring method

Abstract

The invention discloses a linear motor rotor position measuring method. The linear motor rotor position measuring method is characterized in that a reference image with the gray level gradually changing is arranged on a base of a linear motor, a video camera fixedly arranged on a motor rotor continuously shoots the reference image, single-line sampling is carried out on every two adjacent obtained images many times at intervals, the image information of the same lines corresponding to the two images is extracted in each-time single-line sampling, a phase correlation algorithm based on singular value decomposition (SVD) is carried out on the two single-line images obtained through each-time single-line sampling to obtain the horizontal movement values of the two single-line images in the motor rotor moving direction, statistics is carried out on the obtained multiple horizontal movement values to obtain the most precise horizontal movement value, and then the displacement and the speed of the motor rotor can be obtained. According to the method, the simultaneous multi-sampling single-line processing is suitable for hardware parallel processing, and achievement is easy. The linear motor rotor position measuring method is used for achieving the precise measurement of the position of the linear motor rotor, and the real-time performance and the anti-interference in the measuring process can be guaranteed.

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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