The main differences are:
1, high acceleration is a significant advantage of linear motor drive over linear module drive.
2, linear motors than linear modules with high precision, linear motor structure is simple, do not need to go through the intermediate conversion mechanism and directly generate linear motion, the motion inertia is reduced, the dynamic response performance and positioning accuracy is greatly improved.
3, linear motor than linear module noise, because the linear motor does not exist in the centrifugal force constraints, the movement of no mechanical contact, there is no friction and noise. There is no wear and tear of transmission parts, which can greatly reduce mechanical loss and avoid noise caused by tow cable, steel cable, gears and pulleys, etc., thus improving the overall efficiency.
4, precision linear module effective stroke will be limited by aluminum or wire rod, etc., while the linear motor effective stroke is not limited.
Linear motor:
Linear module:
Expanded information:
1, linear motor working principle:
Linear motor is a kind of electrical energy will be directly converted into linear motion mechanical energy, without any intermediate conversion mechanism of the transmission device. It can be seen as a rotating motor by radial section, and spread into a plane and become.
The side evolved from the stator is called the primary, and the side evolved from the rotor is called the secondary. In practice, the primary and secondary are manufactured in different lengths to ensure that the coupling between the primary and secondary remains constant over the required travel range. Linear motors can have a short primary and long secondary or a long primary and short secondary.
Taking into account the manufacturing cost, operating costs, are generally used short primary and long secondary. The working principle of linear motors is similar to that of rotary motors. Linear induction motor, for example: when the primary winding into the AC power supply, it will produce traveling wave magnetic field in the air gap, the secondary in the traveling wave magnetic field cutting, will induce an electromotive force and produce a current, the current and the magnetic field in the air gap will produce electromagnetic thrust.
If the primary is fixed, the secondary under the action of the thrust to do linear motion; vice versa, the primary to do linear motion.? Drive control technology for linear motors? A linear motor application system must not only have a good performance of the linear motor, but also must have the ability to realize the technical and economic requirements of the control system under safe and reliable conditions.
With the development of automatic control technology and microcomputer technology, linear motor control methods are more and more. The study of linear motor control technology can basically be divided into three aspects: one is the traditional control technology, the second is the modern control technology, the third is the intelligent control technology. Traditional control techniques such as PID feedback control, decoupling control, etc. have been widely used in AC servo systems.
Which PID control implies the dynamic control process of the past, present and future information, and the configuration is almost optimal, has a strong robustness, is the most basic control mode in the AC servo motor drive system. In order to improve the control effect, often use decoupling control and vector control technology.?
In the object model is determined, does not change and is linear, as well as the operating conditions, the operating environment is determined under the conditions of invariable, the use of traditional control technology is simple and effective. However, in the high-performance situation of high-precision microfeeding, it is necessary to consider the variation of the object structure and parameters. Various non-linear effects, changes in the operating environment and environmental interference and other time-varying and uncertain factors, in order to obtain satisfactory control results.
Therefore, modern control technology in the linear servo motor control research has attracted great attention. Commonly used control methods are: adaptive control, sliding mode variable structure control, robust control and intelligent control. In recent years fuzzy logic control, neural network control and other intelligent control methods have also been introduced into the control of linear motor drive system.
2, linear module type
(1) synchronous belt type:
The working principle of synchronous belt type is: the belt is installed in the linear module on both sides of the drive shaft, which serves as the power input shaft, a piece of the belt is fixed to increase the slider of the workpiece of the equipment. When there is input, the slider moves by driving the belt.
Often synchronous belt type linear module after a specific design, on its side can control the belt movement of the tension, convenient equipment in the production process of debugging.
Synchronous belt linear modules can be selected according to different loads need to increase the rigidity of the guide to improve the rigidity of the linear module. Different specifications of linear modules, the upper limit of the load is different.
The accuracy of synchronous belt linear modules depends on the quality of the belt and the machining process in the combination, and the control of the power input will have an impact on its accuracy at the same time.
(2) Screw type:
1) Ball screws are ideal for converting rotary motion into linear motion, or linear motion into rotary motion. Ball screw consists of screw, nut and ball. Its function is to convert rotary motion into linear motion, which is a further extension and development of the ball screw, and the significance of this development is to change the bearing from a rolling action into a sliding action.
Ball screws are widely used in a variety of industrial equipment and precision instruments due to their low frictional resistance. It can realize high-precision linear motion under high load.
2) Linear guides, also known as slide rails, linear guide, linear slide, used in linear reciprocating motion occasions, has a higher load rating than linear bearings, at the same time can bear a certain amount of torque, can be in the case of high loads to achieve high precision linear motion. Structure, high precision; precision level guide plate,
3) aluminum alloy profile sliding table beautiful appearance, reasonable design, good rigidity, reliable performance, is the combination of machine tools and automatic line is more ideal for the foundation Dynamic performance of power components. Sliding table with high rigidity, small thermal deformation, high stability of feed, thus ensuring the actual accuracy of the machining state (under load).
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