A new high-response self-balancing sensorless control system of induction motor for weft accumulator

Self-Balancing Control of Yarn Number Based on a Novel Sensorless PMSM Speed Drive System

“…When the yarn passes through the air gap between the infrared module and the mirror at high speed, its shielding effect will inevitably lead to the change of the instantaneous amplitude of the infrared sensing signal. Then the high-speed signal acquisition can be achieved [3]. The drive system is used for driving PMSM of the weft accumulator, which is the key component to realize the high-response and high-precision adaptive control of the yarn number.…”

“…The existing weft accumulator drive system mostly adopts the compensation method based on open-loop control, which has the problems of poor accuracy and low response for the tracking of yarn numbers [1][2][3]. In order to realize the high-response adaptive tracking of the yarn input number to yarn output number, a self-balancing closed-loop control of yarn number based on a PDF controller is proposed in this paper, as shown in Fig.…”

“…EFT accumulator is one of the critical components in textile machinery such as the rapier loom, projectile loom, water jet loom, and air-jet loom, etc [1][2]. The traditional weft accumulators generally use the asynchronous motor [3] as the driving unit, which has characteristics of simple control and a smooth start. However, the asynchronous motor cannot achieve high-efficiency operation in the full-speed range, and serious heating of the motor due to frequent start-up and stop operation will occur, which affects the quality of the feeding yarn.…”

A voltage waveform design method for shortening current response time of a coil

“…A current sensor is used to measure the current, and the measured and expected currents are input into the proportional-integrative-derivative (PID)/ proportional-integral (PI) regulator to adjust the voltage, which makes the current reach the expected value rapidly. 4,16,18,21 Yang 18 experimentally demonstrated that the current response time of an MR damper based on the current control could be shortened by 94% compared with that based on the voltage control. However, the current oscillation of the current control exceeded 25% of the expected current.…”

“…Meanwhile, the energy utilization of the solenoid valve was decreased by 4%, which was the main limitation of shortening the current response time by increasing the maximum voltage. Lu 21 optimized the algorithm of the PI regulator by designing the PI regulator with adaptive coefficients instead of the conventional fixed coefficients to shorten the convergence time of the PI regulator. By using the PI regulator, the response time of the induction motor speed from zero to the expected value could be shortened by 35%.…”