The voice coil motor, named for its structure similar to the voice coil of a horn, is a special form of direct drive motor that converts electrical energy directly into linear motion mechanical energy without the need for any intermediate transfer mechanism. The principle is: a cylindrical winding is placed in a uniform air gap magnetic field, the winding is energized to generate electromagnetic force to drive the load to make a linear reciprocating motion, and the magnitude and direction of the electromagnetic force can be changed by changing the strength and polarity of the current. Therefore, the voice coil motor can be in the form of a straight line or a rotation. The utility model has the advantages of high response, high speed, high acceleration, simple structure, small volume, good force characteristics and convenient control.
SMT machine: also known as "mounting machine", "surface mount system" (Surface Mount System), in the production line, it is configured after the dispenser or screen printer, is the surface mount by moving the placement head The device accurately places a device on the PCB pad. The automatic placement machine is a device for realizing high-speed, high-precision and automatic placement of components, and is the most critical and most complex device in the entire SMT production. The SMT machine is the main equipment in the SMT production line. The SMT machine has developed from the early low-speed mechanical placement machine to the high-speed optical centering machine, and has developed modularly to the multifunctional and flexible connection.
How to improve the work efficiency of patch actuators will always be the direction of patch professional research. Voice coil motors are one of the options. The application of a voice coil motor can realize a patch actuator having a higher speed, a wider range of application, and a better performance.
The motion of the voice coil motor that needs to be completed in the patching process has three main parts: picking up, rotating, and placing. The pick-up and rotation actions only require a position of the moving target, and both the pick-up and rotation of the voice coil motor are repeated movements. Chip placement is the most critical part of the entire patch process. In order to ensure the reliability of the patch, this link not only requires high-precision position control, but also controls the output force of the linear motor of the voice coil motor, that is, force/position mixing control. Specific to the control method of the voice coil motor, that is how to achieve a soft landing of the voice coil motor efficiently and safely, the latter can effectively realize the soft landing control of the voice coil motor, and in terms of parameter setting, program preparation and motion trajectory observation, etc. Relatively more advantages than the former.
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