What is the difference between a linear motor and a rotary motor?
Electric slide table, also known as linear module, linear slide table, linear module, is an automated transmission component that uses synchronous belt or ball screw to drive the slider to move. It is generally assembled from synchronous belt/ball screw, linear guide rail, aluminum alloy profile, ball screw support seat, coupling, motor, photoelectric switch and other components.
Linear motor, also known as linear motor, is a transmission device that directly converts electrical energy into linear motion mechanical energy without the need for any central conversion organization.
The difference between electric slide table and linear motor
Electric sliding table and linear motor have both differences and connections. They all belong to automated transmission components that can complete linear motion. They are assembled on aluminum profiles with cover plates, and look similar in appearance.
1. Differences in the Principle of Linear Motion
Although the appearance is similar, the principle of linear motion is different. Linear motors directly convert electrical energy into mechanical energy and complete linear motion without the need for a central structure, while electric sliding tables require the use of ball screws or synchronous belts to convert curved motion into linear motion.
2. Differences in accuracy
Linear motors have higher accuracy than linear modules. Linear motors have a simple structure and do not require center conversion to directly generate linear motion. The inertia of motion is reduced, and the dynamic response performance and positioning accuracy are greatly improved. The accuracy of linear motors can reach 0.001mm, while the accuracy of electric sliding tables is generally around 0.005-0.04.
3. The difference in speed
Linear motors have significant advantages in terms of speed. The speed of the linear motor is 300m/min; The acceleration is 10g. The speed of the ball screw is 120 m/min; The acceleration is 1.5g. Linear motors have significant advantages in terms of speed and acceleration, and their speed will further increase after successfully solving the heating problem. However, the combination of rotary servo motors and ball screws is limited in speed and difficult to improve further. In terms of dynamic response, linear motors have an absolute advantage due to issues such as motion inertia, clearance, and organizational complexity.
In terms of speed control, linear motors respond faster and have a wider speed range, reaching 1:10000. They can reach the highest speed at the moment of starting and quickly stop running at high speeds.
4. Differences in Noise
Linear motors have lower noise compared to linear modules. As linear motors do not have the constraint of centrifugal force, there is no mechanical touch during movement, so there is no conflict or noise. The transmission components are not worn, which can greatly reduce mechanical wear and avoid noise caused by towing cables, steel cables, gears, and pulleys, thereby improving overall efficiency.
5. Price difference
Linear motors have higher performance than linear modules in all aspects, so in terms of price, linear motors are relatively expensive, usually several times more expensive.
Jen
07-18Firstly, most motors are rotating because in daily life, household motors and most industrial motors are rotating, and some linear motion can also be achieved through gear transmission. Linear motors, although claimed to improve efficiency through direct drive in many industrial settings, have limited practical applications in my personal opinion. The linear motors used in some maglev trains are more familiar to the general public and easier to understand. The principle of motors is electromagnetic induction. Simply put, a charged conductor is subjected to the force of a magnetic field, and the change in the electric field of the charged conductor also generates a magnetic field. It can also be understood as the effect of the magnetic fields on both sides of the stator and rotor, and this effect occurs through the air gap. The difference is that the magnetic field of a rotating motor is distributed along the circumferential direction (for traditional radial magnetic field motors, axial magnetic flux or complex ones are not mentioned), while the magnetic field of a linear motor is distributed along a straight line, which leads to the biggest difference, which is the motion trajectory.
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