Sine and cosine position encoder suitable for stator non-magnetic-rail type linear motor

Abstract

The invention discloses a sine and cosine position encoder suitable for a stator non-magnetic-rail type linear motor. The sine and cosine position encoder comprises an installation support, an iron core, an excitation coil and a response coil. According to the main structure of the position encoder, the iron core, the exciting coil and the response coil are combined to form a position encoder bodyand fixed to an installation support, the body is installed in the vertical direction of a stator of the stator non-magnetic-rail type linear motor, and a certain air gap is reserved between the bodyand the stator of the stator non-magnetic-rail type linear motor. According to the working principle, after an excitation signal is input into the excitation coil, the iron core and the stator of thestator non-magnetic-rail type linear motor interact in the motor advancing process, magnetic flux density similar to sine change is generated, and then a response signal is generated in the responsecoil. And the response coil is connected in series or in parallel to reconstruct a response signal to obtain mutually orthogonal sine and cosine signals so as to reflect the real-time rotor position of the stator non-magnetic-rail type linear motor. The position encoder has the advantages of small size, reliable structure, high precision, low cost and the like.

Description

Technical field[0001]The invention relates to the technical field of permanent magnet synchronous linear motors, and in particular to a sine-cosine position encoder suitable for stator non-magnetic track linear motors.Background technique[0002]In the permanent magnet synchronous linear motor servo system, the position detection of the motor mover is a crucial part, and the position detection technology applied directly affects the control performance of the motor. Although the current position sensorless detection technology is relatively mature, the detection accuracy and stability of this technology are restricted, and it is not suitable for occasions that require high position accuracy. In the field of stator non-magnetic track linear motor displacement sensors, linear displacement sensors such as grating scales and magnetic scales have the advantages of high accuracy in the application process. However, due to the high cost, large size and impact of the motor performance, such s...

AI Technical Summary

Problems solved by technology

In the field of stator trackless linear motor displacement sensors, linear displacement sensors such as grating scales and magnetic scales have the advantages of high precision in the application process, but due to the high cost, large size and impact on the performance of the motor, such sensors, It is limited to a certain extent in engineering applications

Images