Magnetic encoder based on double synchronous rotation coordinate systems

Abstract

The invention discloses a magnetic encoder based on double synchronous rotation coordinate systems. The magnetic encoder based on the double synchronous rotation coordinate systems comprises a magneto-electricity signal generator, a signal conditioner, a signal acquisition module and a signal processing unit, wherein the signal processing unit is composed of a forward-direction Parker converter, a reverse-direction Parker converter, a forward-direction decoupling device, a reverse-direction coupling device, low-pass filters and a motion information solver, and is used for carrying out coordinate transformation, decoupling operation, filtering processing and motion information calculation on digital electrical signals input by the signal acquisition module. The signal processing unit which uses the double synchronous coordinate transformation mode carries out coordinate transformation on positive sequence components and negative sequence components of fundamental waves in magneto-electricity signals, and resolves the positive sequence components and the negative sequence components of the fundamental waves into components in a positive sequence dq coordinate system and components in a negative sequence dq coordinate system, calculation of motion information is achieved through a decoupling network and the filtering link, signal distortion components generated due to device difference, installation errors and the like can be eliminated through the decoupling devices and the low-pass filters, and thus calculation accuracy and the anti-interference capacity of the magnetic encoder are greatly improved.

Description

technical field [0001] The invention belongs to the field of motion information detection sensors, and more specifically relates to a magnetic encoder based on a double synchronous rotating coordinate system. Background technique [0002] A magnetic encoder is a sensor that measures and extracts movement information such as movement speed and movement distance by solving the movement information of magnetic components. Its applicable occasions are not affected by factors such as fog, smoke and oil. The sensitivity to installation errors and vibrations is not as strong as that of photoelectric encoders, and its manufacturing process is simple, low in cost, and the encoding interface is rich and flexible. It is an important development direction in the field of motion information detection applications. [0003] At present, the magnetic encoder signal solution methods under research and in use mainly include arctangent calculation solution algorithm, calibration look-up table ...

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Problems solved by technology

The application document assumes that the original magnetoelectric signal is ideally orthogonal by default, so it does not consider the error caused by factors such as component performance differences and installation errors to the motion information solution, so the accuracy of the solution is inevitably affected by the installation process level of the magnetic encoder and Influence of component performance uniformity level

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