Magnetic induction incremental bus encoder for high-speed and high-precision machine tool spindles and electric spindles

Abstract

The invention relates to a high-speed high-precision machine tool spindle and an electric spindle magnetic induction incremental bus type encoder, including a measuring gear and a magnetic induction reading head; the magnetic induction reading head is provided with magnetic induction components, a signal conditioning circuit, and a reference zero point comparator circuit And FPGA interpolation subdivision circuit, the magnetic induction components are installed tangent to the circumference of the measuring gear, and the sine-cosine quadrature differential signal and the reference zero point differential signal generated by the non-contact scanning of the measuring gear by the magnetic induction components are passed through the signal After conditioning the circuit, the FPGA interpolation subdivision circuit performs real-time correction and compensation for its DC offset error, amplitude error and quadrature phase error, and combines with the reference zero comparator circuit to generate the rotation of the shaft relative to the power-on moment The relative position value of the angle and the absolute position value of the rotation angle of the shaft relative to the reference zero point signal, the mechanical transmission structure is simple, the positioning of the machine tool spindle and the repeat positioning accuracy are improved, and the overall measurement accuracy and processing efficiency of the CNC machine tool are improved.

Description

technical field [0001] The present invention relates to an encoder (Encoder), in particular to a high-speed high-precision machine tool spindle, electric spindle magnetic induction incremental bus encoder, which can be widely used in the fields of numerical control machine tools, robots, elevators and industrial automation. Background technique [0002] An encoder is a sensor used to detect angle, position, speed and acceleration. It is a device that compiles and converts the angular displacement or linear displacement of mechanical rotation into an electrical signal that can be used for communication, transmission and storage. Precision measuring devices that combine machinery and electronics are widely used in many fields such as motors, automobiles, wind power, and robots. In terms of measurement function, encoders can be divided into incremental encoders (also called incremental encoders) and absolute encoders. From the measurement principle, encoders include photoelect...

AI Technical Summary

Problems solved by technology

[0014] In order to solve the technical problem of low encoder control accuracy and reliability in the prior art, the present invention provides a magnetic induction incremental bus encoder suitable for high-speed high-precision machine tool spindles and electric spindles. The encoder uses gear induction magnetic force lines The working principle is to perform non-contact scanning on the measuring gear to generate high-reliability sine-cosine quadrature differential signals and reference zero point differential signals. FPGA field programmable logic devices are used to realize high-precision interpolation and subdivision of sine-cosine signals. Combined with the reference zero point comparator circuit, the relative position value of the high line number relative to the rotation angle of the rotating shaft at the power-on moment and the absolute position value of the high line number relative to the rotating shaft rotation angle of the reference zero point signal are respectively generated inside the encoder. While reducing the complex mechanical transmission mechanism, the positioning and repeat positioning accuracy of the machine tool spindle are greatly improved, thereby improving the overall measurement accuracy and processing efficiency of the CNC machine tool

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