Browse Publications Technical Papers 2019-01-1348

AFP Modular Head With Servo Creel 2019-01-1348

A 16 tow modular head AFP head is developed with a servo creel. The tension of each tow is controlled by a servo motor as it is unwound. There are sixteen servo motors for precision unwinding of the tow, each in turn controlled by a dancer with a position feedback device. The head is modular, de-attachable and re-attachable from the machine. Implementing a modular head requires that all electrical and fluid connections to the head be automatically connected when the head is attached and disconnected when the head is detached. A goal of the designer would be to minimize the number of those connections. A servomotor with integrated electronics and I/O was selected, the SM23166MT made by MOOG. This device is small enough to be mounted inside the modular servo head and includes all of the electronics required. The motor package includes electronics that accept analog input from the Sick position sensor which senses the dancer position. They need to control the servo motor such that the dancer stays in the desired central position on its track. All of this could be readily achieved with the Moog SM23166MT, one for each spool. The result is extremely smooth and reliable laydown with the dancers precisely controlled in the center position. For example if the spool is 4 inch in diameter and the AFP machine is laying tape at 5000 inches per minute then the spool is unwinding tow at 398 RPM. Due to the gearbox ratio 10:1 that means that the servomotor is unwinding at 3980 RPM. The maximum speed of the servomotor is 4700 RPM so there is adequate headroom. The motor torque is 0.9 Ntm which with the benefit of the 10:1 reducer is more than adequate to accelerate and decelerate the spool.


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