Method for straight line motor automatic door vector control based on linear Hall sensor

A linear motor and linear Hall technology, applied in vector control systems, motor generator control, AC motor control, etc., can solve the requirements of unsuitable working environment and low cost, unsuitable for large-stroke operation of automatic doors, and measurement feedback components Expensive and other issues, to achieve high system stability and reliability, easy to implement algorithms, and reduce hardware costs

Active Publication Date: 2017-12-12
谢文超
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the common linear motors on the market have the characteristics of short strokes and expensive measurement feedback components, which are not suitable for the large stroke operation of automatic doors, nor are they suitable for their complicated and harsh working environment and low cost requirements.

Method used

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  • Method for straight line motor automatic door vector control based on linear Hall sensor
  • Method for straight line motor automatic door vector control based on linear Hall sensor
  • Method for straight line motor automatic door vector control based on linear Hall sensor

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Embodiment Construction

[0023] See figure 1 , the linear motor automatic door driver adopting the inventive method includes two linear motors, a controller located in the middle of the two linear motors, a permanent magnet moving rail (not shown) driven by the linear motors, and the controller includes two linear motors with a difference of 90°. Hall sensor and a DSP chip that receives the linear Hall sensor voltage signal and performs calculations. The driver uses a 40 series linear motor with a rated power of 100w. The main chip of the driver uses DSP33EP512, and the linear Hall model is AH3503. In addition to the 90-degree difference between the linear Hall sensor and the moving track magnet, the gap between it and the moving track magnet should be between 1.5mm and 3mm.

[0024] See figure 2 , the method for the linear motor automatic door vector control based on the linear Hall sensor provided by the present invention includes: detecting the back electromotive force of the linear motor throug...

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Abstract

The invention discloses a method for straight line motor automatic door vector control based on linear Hall sensors. The method comprises the following steps: detecting counter electromotive force of a linear motor through two linear Hall sensors which differ from each other for 90 degrees, and performing vector control; according to the counter electromotive force, calculating an electric angle of the linear motor; according to difference feedback of the electric angle, calculating an operation speed of the linear motor and a total route to be operated; comparing the operation speed calculated according to the feedback of the linear motor with a given speed so as to obtain a speed difference, performing PID (Proportional Integral Differential) control of a speed control ring so as to obtain output torque current Iqref, enabling exciting current Idref to be 0, adopting the output torque current Iqref and the current Idref=0 as input of the torque control ring, generating voltage output expected by the linear motor through the torque control ring, and changing the operation speed of the linear motor along with change of the given speed. The method has the advantages of being high in precision, low in cost and easy in algorithm achievement.

Description

technical field [0001] The invention belongs to a control method of a linear motor, in particular to a vector control method of a linear motor automatic door based on a linear Hall sensor. technical background [0002] In the permanent magnet linear motor servo control system, no matter what method is used, it is necessary to accurately detect the position of the motor mover. It can be said that the position detection part is a very critical component in the servo control system, which directly affects the motor control accuracy and system performance. At present, in the linear motion control system, the most common position detection method is to use a linear grating, but the cost of the grating is very high, and the installation requirements are also very high; there are also additional mechanical structures to convert the linear motion into a rotary motion, and then use The method of position detection by rotary encoder obviously has disadvantages in both cost and accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/08H02P25/064
CPCH02P21/08H02P25/064
Inventor 邹威
Owner 谢文超
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