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Accuracy analysis of linear motor and linear motion system V1.0
Author:Administrator   Published in:2019-07-31 15:24

   Using the alternating current direction of the current flowing in the mover coil, an electromagnetic field with alternating polarity changes is generated, which is opposite to the opposite polarity between the S pole and the N pole of the permanent magnet block of the stator, and the principle of homosexual reciprocation, so that the mover is in the stator The motor that moves linearly in suspension is a linear motor, also called a linear motor. In theory, the permanent magnet block on the stator can be infinitely spliced, and the mover stroke can be infinitely long. A loadable multi-axial linear motion mechanism constructed with a linear motor becomes a linear motion system. It mainly uses two indicators to calibrate its motion accuracy, positioning accuracy and repeatability:

 

    Positioning accuracy: The driver sets the difference between the stroke of the mover motion and the actual length (indicated by the scale read head). It is the concept of precision for full stroke. For example, the program is set to run Ls: 60.00mm, actually ran Lt: 59.92mm. Then:

Positioning accuracy α= Ls–Lt= 60.00-59.92= 0.08mm

Expressed as a percentage: α = (Ls - Lt) / Ls X 100% = (60.00 - 59.92) / 60 = 0.13%

 

    Repeating accuracy: The driver sets the stroke of the mover motion (to a specified position) and traverses to the same specified position twice. The difference between the two indicated values of the scale read head is also called repeat positioning accuracy. For example, to run to the specified position of Ls: 60.00mm, the first time ran L1: 60.02mm, the second time ran L2: 59.97. Then:

Repeatability β= L1-L2= 60.02 - 59.97=0.05mm

Expressed as a percentage as β = (L1-L2) / Ls X 100% = (60.02 - 59.97) / 60 = 0.08%

 

    Normally, only the motion system uses the positioning accuracy and repeatability to calibrate the accuracy of the system or product. Repeated positioning accuracy is generally higher than the positioning accuracy. For example, the US TEO brand LMS-3000 series high-precision multi-axis linear motion system platform, the positioning accuracy α can reach 0.1μm; the repeat positioning accuracy β can reach 0.01μm.

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