Linear motor position feedback device

Abstract

The invention discloses a linear motor position feedback device which comprises a magnetic displacement encoder, a signal adapter and a connecting line which are connected via a connecting line. The magnetic displacement encoder comprises a magnetic resistance and magnetic field detection circuit and an analog sine / cosine signal output signal connected successively, and the signal adapter comprises a refining circuit, and a power supply circuit, an external EEPROM storage circuit, an SPI serial debugging interface circuit, an error state indication circuit, an amplitude phase calibration circuit and a differential driving circuit connected to the refining circuit. A magnetic resistance chip is used to detect magnetic field change and output an analog sine / cosine signal, analog-to-digital conversion, refining and difference output are carried out on the analog sine / cosine signal, the signal is fed back to a servo driver, the linear motor position is detected, both a grating and a magnetic railing ruler are omitted, the structure is simple, installation is convenient, there is no friction due the non-contact manner, the anti pollution level is high, and the cost is reduced greatly.

Description

technical field [0001] The invention relates to motor position detection, in particular to a linear motor position feedback device. Background technique [0002] With the advancement of science and technology and the improvement of automation level, linear motors, as a transmission device that directly converts electrical energy into linear motion mechanical energy, have been widely used in the field of automatic control. Domestic research on linear motors and their servo drive systems Also step by step. At present, in the linear motor system, optical sensing or magnetic induction is mainly used as the position feedback method of the mover. The optical sensing position feedback device is mainly composed of a grating ruler and an optical encoder reading head, and the accuracy is high. However, due to the production process, The measurement length is limited. The longer the length of the grating ruler, the more difficult it is to manufacture and the higher the cost. It is mos...

AI Technical Summary

Problems solved by technology

At present, in the linear motor system, optical sensing or magnetic induction is mainly used as the position feedback method of the mover. The optical sensing position feedback device is mainly composed of a grating ruler and an optical encoder reading head, and the accuracy is high. However, due to the production process, The measuring length is limited. The longer the length of the grating ruler, the more difficult it is to manufacture and the higher the cost. It is mostly suitable for a stroke of less than 2m, and it is greatly affected by temperature, dust, and oil, and it is more difficult to install.

The magnetic induction position feedback device is mainly composed of a magnetic scale and a magnetic encoder reading head. When it works, it will generate a lot of noise. There are technical requirements for installation, and the longer the linear motor, the longer the magnetic scale, which will increase the cost.

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