Orthogonal trigonometric function double excitation-based encoder and operation method thereof

Abstract

The invention provides an orthogonal trigonometric function double excitation-based encoder; a stator of the encoder comprises an auxiliary ruler region, a main ruler region, an inner ring DA region and an inner ring DB region which are sequentially arranged from outside to inside;a rotor comprises an auxiliary ruler region, a main ruler region, an inner ring ZA region and an inner ring ZB region which are sequentially arranged from outside to inside; the auxiliary ruler region of the stator is annularly and uniformly divided into a plurality of first emission sheets, every four first emission sheets form a group, and every two groups of first emission sheets are used for signals of one period; the main ruler region of the stator is annularly and uniformly divided into a plurality of second emission sheets, every two second emission sheets form a group, and every two groups of second emission sheets are used for signals of one period; theauxiliary ruler region of the rotor is annularly divided into a plurality of first induction sheets, and one first induction sheet covers two continuous first emission sheets; the main ruler region of the rotor is annularly divided into a plurality of second induction sheets, one second induction sheet covers two continuous second emission sheets, and the rotating arc length of the second induction sheets is twice that of the second emission sheets of the stator.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a dual-excitation encoder based on orthogonal trigonometric functions and an operating method thereof. Background technique [0002] In the field of industrial machinery automation and numerical control processing, encoders are often required as precision position and angle feedback devices for displacement feedback and high-precision processing and measurement of some mechanical structures. [0003] At present, gratings, magnetic gratings, and capacitive gratings are mainly used as grating encoders on the market. The grating lines that are evenly distributed along the space are formed by using the regular and periodic changes of a certain physical quantity during its movement. A displacement pulse signal sent out every time a grid pitch is accumulated to obtain the displacement. Grating is currently the most widely used grating encoder with high precis...

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Problems solved by technology

[0005] However, the current time grating displacement encoders basically use single excitation, that is, a single-channel single-frequency sine wave excitation, through It is realized by phase shifting method, single-channel excitation can only achieve a single calculation reference phase, and internal and external reference signals can only be obtained through the following The periodic signal is used as the division of calculation parameters. When the rotor rotates at high speed and low speed, the calculation error is large.

When the signal source is interfered, the interference signal will be directly superimposed on the source signal. When the frequency of the interference source is close to the source frequency, it is difficult to deal with and the anti-interference ability is low

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