An Accurate Prediction Method for Thrust of Permanent Magnet Synchronous Linear Motor Considering Air Gap Fluctuation

A permanent magnet synchronous linear, motor thrust technology, applied in motor control, AC motor control, electrical components, etc., can solve the problem of little research on the influence of motor thrust reaction, and achieve simple and clear principles and calculation processes, fast analytical quantitative analysis Effect

Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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Problems solved by technology

However, there is little research on the reaction effect of mechanical vibration on motor thrust.

Method used

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  • An Accurate Prediction Method for Thrust of Permanent Magnet Synchronous Linear Motor Considering Air Gap Fluctuation
  • An Accurate Prediction Method for Thrust of Permanent Magnet Synchronous Linear Motor Considering Air Gap Fluctuation
  • An Accurate Prediction Method for Thrust of Permanent Magnet Synchronous Linear Motor Considering Air Gap Fluctuation

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0046] The present invention is a method for accurately predicting the thrust of a permanent magnet synchronous linear motor considering air gap fluctuations, such as figure 1 shown, including the following steps,

[0047] Step 1: Obtain the torsional oscillation angular displacement θ(t) of the workbench of the permanent magnet synchronous linear motor feed system through the experimental test or simulation model, and calculate the actual air gap g of the motor after considering the mechanical oscillation according to the motor installation position and mechanical structure parameters '(x 0 ,t), where x 0 Indicates different positions in the motor mover coordinate system.

[0048] Step 2: Introduce the relative permeability function to describe the influence of the motor air gap fluctuati...

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Abstract

The invention provides a permanent magnet synchronous linear motor thrust accurate prediction method considering air gap fluctuation. The method comprises the following steps that 1. the actual air gap of the motor after considering mechanical oscillation is calculated; 2. the relative permeance function is introduced to describe the influence of the motor air gap fluctuation on the motor air gapmagnetic field distribution; 3. a permanent magnet field equation is established for the vector magnetic potential, and the basic magnetic field intensity produced by the permanent magnet is solved; and the motor air gap magnetic field intensity considering the slot effect and the end effect is obtained; 4. the relative permeance function considering the air gap change obtained in the step two isintroduced to the step three so that the air gap magnetic field distribution of any point of the motor rotor is obtained; and 5. the motor thrust F considering the air gap fluctuation is calculated byusing an electromagnetic energy method. The method has great significance for revealing the complex electromechanical coupling problem in the linear motor feed system and further mechanical structureoptimization and feedforward control compensation strategy.

Description

technical field [0001] The invention relates to the field of motor performance analysis and evaluation, in particular to a method for accurately predicting the thrust of a permanent magnet synchronous linear motor considering air gap fluctuations. Background technique [0002] The permanent magnet synchronous linear motor feed system realizes zero feed transmission. Compared with the traditional ball screw feed system, it has the advantages of large thrust, high speed and good precision. It has broad application prospects in high-speed high-precision CNC machine tools . However, direct drive feed has not fully utilized its advantages at present. During the motion process, thrust harmonics, friction, cutting force and other external disturbances directly act on the mechanical system, causing obvious mechanical oscillations. Since the motor mover is directly connected to the drive components, mechanical vibrations other than the feed direction, especially mechanical vibratio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/064
CPCH02P25/064H02P2207/05
Inventor 赵万华杨晓君刘辉吕盾张俊张会杰
Owner XI AN JIAOTONG UNIV
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