The composition of the laser marking machine vibration mirror: manipulator, vibration lens (motor). The basic structure of the vibration lens: vibration lens by the stator, rotor, detection sensor three parts. Vibrating lens are the use of permanent magnets for the magnetic core, detection sensor imitation vibrating mirror for capacitive sensors, digital vibrating mirror for the scale detection sensor. Capacitance sensor is the motor swing, the detection sensor of the electrical capacity of a small change, the capacitance of the change into an electrical signal, feedback to the controller, and then closed-loop control. The optical scale sensor measures the actual deflection point through the optical scale, and then transforms it into an electrical signal and feeds it to the galvanometer scanner controller for closed-loop control. Dynamic coil type due to the rotor for the coil, and the coil is relatively large, large rotational inertia, is not conducive to rapid response, so now simply do not choose. Dynamic magnetic type because of the hollow core column-shaped core mounted on the rotation axis, small volume, small inertia, so the speed response function is very good.
The principle of laser oscillator: input a position signal, the oscillating motor (laser oscillator) will swing a certain angle according to the conversion ratio of certain voltage and angle. The whole process is controlled by closed-loop feedback, with five major control circuits, such as position sensor, error amplifier, power amplifier, position differentiator and current integrator. And the principle of digital laser oscillator is to convert the analog signal into digital signal on the principle of analog laser oscillator.
The fundamental operating principle of the motor: the motor is a magnetic field as the medium, using electromagnetic induction to complete the energy transformation, so its internal must have the magnetic circuit to conduct the magnetic flux and the circuit to conduct the current. When the motor is transformed, it should have two major parts in relative motion: the part that sets up the excitation field and the part that is induced, the motion is called the rotor, and the stop is called the stator. The generator absorbs mechanical power from the mechanical system and outputs electrical power to the electric system; the motor absorbs electrical power from the electric system and outputs mechanical power to the mechanical system. In the process of energy transformation inside the motor, there are electric energy, mechanical energy, magnetic energy and thermal energy, among which thermal energy is caused by the internal energy loss of the motor, which is minimized when designing. For electric motor, the electric energy input from power source = the increment of energy storage in coupled electromagnetic field + the energy lost inside the motor + the mechanical energy output, for generator, the mechanical energy input from mechanical system = the increment of energy storage in coupled electromagnetic field + the energy lost inside the motor + the electric energy output.
Classification of electric motors: Generally, electric motors are divided into four categories - communication motors, DC motors, AC and direct dual-use motors, and special purpose motors. Communication motors include synchronous motors and asynchronous motors. Special purpose motors include electric dynamometers, synchronous regulators, feeders, micro motors, and other special purpose motors. Laser marking machine vibrating lens belongs to other special purpose motors in the swing motor.
The fundamental needs of the manipulator: As the laser marking machine is relying on the cooperation of X, Y vibration deflection, the light will be reflected to the operating table surface for accurate carving. And the manipulation of the oscillator is controlled by the computer open-loop. So it is necessary to be linear, that is, the input signal is linear with the deflection point of view. Because the mirror is a fast precision machinery, so from one operating condition to another operating condition needs to be accelerated as much as possible.
According to the classification of the oscillator.
Digital laser oscillator
The current domestic use of laser vibrators are analog laser vibrators, the realization of the main or use analog devices, because the analog devices are susceptible to electromagnetic radiation interference from the surrounding environment, so in the process of use will appear to have scattered points, line bending, filling with irregular underline and other phenomena. Domestic analog laser oscillator speed compared to foreign countries are relatively slow its small step step response time are more than 300um.
Digital laser oscillator using digital signals for operation to control the motor, can effectively suppress environmental interference, even if the working environment electromagnetic interference is serious, can also be used normally. The system uses foreign control technology, the system response speed is very high, basically beyond the same type of domestic laser oscillator system. The motor uses a special process, long life, stable and reliable performance.
Scanning laser oscillator.
High-speed scanning laser oscillator system is a high-performance rotating motor specially designed for optical scanning applications. The motor part uses a kind of high precision position sensor. The main application is the fast and precise positioning of the beam. The high speed laser oscillator is the result of many years of experience in the development and production of industrial laser oscillator scanning systems. The motor is specially designed for the lens load to achieve the optimal scanning performance. Special treatment is applied to the bearing part, which is capable of long-term uninterrupted operation. The special design of the bearings enables the system to achieve the highest dynamic performance and resonance characteristics. The international leading digital control method can effectively avoid various electromagnetic interference in the working environment, and the advanced control algorithm can ensure that the system has a faster response speed.
The photoelectric sensor used in the high-speed scanning laser oscillator has high resolution and very good repeatability as well as very small drift. The motor has a heating device and temperature sensor, which can work stably in the case of environmental fluctuations. In summary, the high-speed scanning laser oscillator can ensure long-term stable operation.