The research of iterative learning control method on linear voice coil motor and application in flip chip

In this paper, we report the research of iterative learning control method on linear voice coli motor and application in flip chip. As the flip chip technology has realized minimum size package, excellent electric performance and thermal characteristics, it is suitable for mass production and high-density package. The process usually includes two different kinds of movement under the high speed and high acceleration circumstance, so the linear voice coil motor (VCM) was chosen as its drive. In the “pick” process, the iterative learning control method was proposed to improve the precision: in the “place” process of flip chip, a new soft landing method was proposed to realize low contact force, and the motion track is optimized. The application result in IC packaging and assembly equipment proved the effectiveness of the control method.