Linear modules, also known as linear slides or electric slides, are automated transmission components that use synchronous belts or ball screws to drive the movement of sliders. They are generally assembled from components such as synchronous belts/ball screws, linear guides, aluminum alloy profiles, ball screw support seats, couplings, motors, and photoelectric switches.
A linear motor, also known as a linear motor or linear motor, is a transmission device that directly converts electrical energy into linear motion mechanical energy without the need for any intermediate conversion mechanism.
The difference between linear modules and linear motors
Linear modules and linear motors are both different and related. They both belong to automation transmission components, capable of achieving linear motion. They both involve assembling various parts onto aluminum profiles and adding cover plates, and they look similar in appearance.
1. Differences in the principles of linear motion
Although they look similar, their linear motion principles are different. Linear motors directly convert electrical energy into mechanical energy and achieve linear motion without intermediate mechanisms, while linear modules require ball screws or synchronous belts to convert curvilinear motion into linear motion.
2. Difference in precision
Linear motors have higher precision than linear modules. Linear motors have a simple structure and can generate linear motion directly without intermediate conversion mechanisms. This reduces motion inertia and greatly improves dynamic response performance and positioning accuracy. The precision of a linear motor can reach 0.001mm, while the precision of a linear module is generally around 0.005-0.04mm.
3. Difference in speed
In terms of speed, linear motors have a significant advantage. A linear motor can reach a speed of 300 m/min with an acceleration of 10g. A ball screw, on the other hand, can only reach 120 m/min with an acceleration of 1.5g. Comparing speed and acceleration, linear motors have a considerable advantage, and their speed can be further increased once the heat generation issue is resolved. In contrast, the combination of a rotary servo motor and a ball screw is significantly limited in terms of speed and difficult to improve further. From a dynamic response perspective, linear motors have an absolute advantage due to their reduced inertia, backlash, and the complexity of their mechanism.
In terms of speed control, linear motors have a faster response and a wider speed range, up to 1:10000. They can reach the maximum speed instantly at startup and stop quickly when running at high speed.
4. Differences in noise
Linear motors are quieter than linear modules because they are not constrained by centrifugal force, and there is no mechanical contact during movement, resulting in no friction or noise. Transmission components experience no wear, significantly reducing mechanical losses and avoiding noise caused by cables, steel wires, gears, and pulleys, thus improving overall efficiency.
5. Price differences
Linear motors outperform linear modules in all aspects, therefore, they are more expensive, often several times more expensive.
These are the main differences between linear modules and linear motors. Of course, in addition to these differences, the drivers are also different. Linear modules use servo motors or stepper motors for control, while linear motors are the driving devices themselves.
So how should one choose between the two? Based on the different characteristics of linear circuits and linear modules, the following selection can be considered:
1. For customers who generally experience low force, long stroke, and high precision requirements, a linear motor is a suitable option.
2. For customers with high load, short stroke, and relatively high precision requirements, a linear ball screw module can be selected;
3. For customers with moderate stress, long stroke, and low precision requirements, a synchronous belt linear module can be selected.
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