Linear motor rotor position detecting method based on extended phase correlation algorithm

Abstract

The invention discloses a linear motor rotor position detecting method based on an extended phase correlation algorithm. The linear motor rotor position detecting method is characterized in that an aperiodic and strong-robustness fence image is engraved on the base of a linear motor to serve as a shooting source; during rotor operation, a high-speed camera is used to shoot in real time to obtain a series of partial fence images; the extended phase correlation algorithm is used to calculate the pixel displacement value between every two adjacent partial fence images; the pixel displacement values are used to obtain the actual displacement value and speed of the a linear motor rotor. The linear motor rotor position detecting method has the advantages that the extended phase correlation algorithm is used to achieve the non-contact precise measuring of the position of the linear motor rotor, and the high-precision measuring and robustness requirements can be satisfied.

Description

technical field [0001] The invention relates to a method for detecting the position of a mover of a linear motor. Background technique [0002] Linear motors have the characteristics of high precision, large stroke, and high acceleration, which make them widely used in ultra-precision manufacturing. The detection accuracy of the mover position of the linear motor directly affects the control accuracy of the motor, and then determines the manufacturing accuracy of the product. Therefore, it is of great practical significance to study a high-precision linear motor mover position measurement method. [0003] At present, magnetic grating sensors, grating sensors, or laser interferometers are mostly used for position measurement of linear motor movers, and the measurement accuracy can reach micron-level or even nanometer-level measurement. Although these methods have certain applications in different measurement environments, each has its own shortcomings: the magnetic grating ...

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Problems solved by technology

[0005] In order to avoid the shortcomings of the traditional measurement method, the present invention provides a linear motor mover position detection method based on the extended phase correlation algorithm, in order to solve the problems of the existing measurement method such as low real-time performance and difficulty in installation and maintenance, and realize the linear motor mover position detection method. High-precision real-time measurement of position

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