The accuracy of a linear motor is also affected by factors such as workload, speed, and acceleration. Generally speaking, linear motors achieve high accuracy when performing low-speed, high-precision positioning, but accuracy degrades at high speeds and with large loads. Therefore, the appropriate linear motor model, control algorithm, and position feedback system must be selected based on the specific application scenario and requirements to ensure the required accuracy in actual operation.
In addition to positioning accuracy, linear motors offer advantages such as fast response, excellent dynamic performance, quiet operation, long life, and low maintenance costs. However, linear motors are relatively expensive, and long-stroke applications require consideration of guideway deformation and thermal expansion, requiring more complex design and control. Therefore, when selecting a linear motor, it is important to comprehensively consider its advantages and disadvantages and conduct a detailed application analysis and technical evaluation.
Simply put, the positioning accuracy of a linear motor is the error between the programmed movement and the actual movement. For example, if the program inputs a 50mm square movement on the X-axis, and the actual measured movement is 49.95, the positioning accuracy is 0.05/50. The repeatability of a linear motor refers to whether it stays at the same point each time it moves forward and retracts.
For example, if the current X-axis position meter shows 50mm and the program instructs a positive feed of 50mm, the meter might display 99.05mm (due to error). Then, the program instructs a negative feed of 50mm. If there were no error, the meter would display 50mm. However, due to repeatability error, the meter might display 50.05mm or 49.95mm. The repeatability in this case is 0.05/50.
To put it simply, the positioning accuracy of a linear motor is based on a reference origin. Each positioning accuracy is calculated based on the accuracy error at that origin. Repeatability is the positional accuracy between two irregular points, without a reference origin.
