Sensors and Materials

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Sensors and Materials,
Volume 29, Number 4 (2017)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 511-522
Online Published: April 19, 2017

Near-Field Electrospinning with Close-Loop Motor Control for Manufacturing Polyvinylidene Fluorid Fibers

Cheng-Tang Pan, Kuo-Chang Tsai, Yun-Ping Sun, and Chung-Ken Yen

(Received September 30, 2016; Accepted January 17, 2017)

Keywords: near-field electrospinning (NFES), polyvinylidene fluoride (PVDF), piezoelectric fiber

In this study, we report a close-loop motor control for a cylindrical collector to obtain continuous and uniform polyvinylidene fluoride (PVDF) piezoelectric fiber arrays using near-field electrospinning (NFES). The as-spun PVDF piezoelectric nanofibers were laid on the top of parallel electrodes to generate current and voltage signals by means of mechanical energy of low-frequency vibrations being converting to electrical energy. The PVDF fibers can be used as a flexible sensing device, such as a smart fabric, owing to their excellent voltage response. A PVDF fiber with continuous and uniform diameter is expected to have stable energy conversion for achieving higher electrical current and voltage signals. To ensure the quality of the production process, a closed-loop system for motor speed control was designed to improve on the disadvantages of open-loop systems, such as sensitivity to disturbances and inability to compensate for these disturbances automatically. Transient response and steady-state error can be controlled more conveniently and accurately. The experimental scheme was designed using Taguchi Methods. A mixed solution of 18 wt% PVDF was placed in a metal needle injector and driven by a syringe pump at 0.2, 0.4, and 0.8 ml/h feeding rates. The needles with 0.2, 0.25, and 0.33 mm diameters were subjected to 13k, 15k, and 17k high voltages with a gap of 1 mm between the metal needle and the cylindrical collectors (electrical fields: E =1.3 × 107, 1.5 × 107, and 1.7 × 107 V/m, respectively). The metal needle travelled in the axial direction of the cylindrical collectors at120, 160, and 200 mm/min, respectively. The cylindrical collector motor operated with six different speeds in the range of 900–1900 rpm. With the motor speed control system, about Ip–p = 8.8 × 10−7 A (Imax = −5.0 × 10−7 A) and Vp–p = 0.22 V (Vmax = −0.12 V) were obtained from the PVDF piezoelectric fiber array, which is obviously better than its counterpart of about Ip–p = 3.2 × 10−7 A (Imax = −2.1× 10−7 A) and Vp–p = 0.17 V (Vmax = −0.10 V) with the open-loop system.

Corresponding author: Kuo-Chang Tsai


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