Cosine‐Trapezoidal Soft‐Starting Control Strategy for a Belt Conveyor

Abstract

To improve the soft-starting performance of a belt conveyor, a cosine-trapezoidal soft-starting control strategy is proposed. With this strategy, the speed curve for soft-starting is S-shaped, continuous, and smooth. The acceleration and jerk are also continuous and smooth without discontinuities. The time-interval ratio of the horizontal and cosine curves can be changed via a single parameter setting, so that the strategy can be modified to meet different practical needs. In this paper, the soft-starting control strategy of cosine trapezoid is analyzed and simulated based on current international and domestic standards. The results show that compared with the classical soft-starting control strategy, the cosine-trapezoidal soft-starting control strategy enables the belt conveyor to start at its highest efficiency. Moreover, the energy savings are obvious, the safety performance is good, and the controllable performance is excellent.

AMT Starting Control as a Soft Starter for Belt Conveyors Using a Data-Driven Method

“…The maximum value of the belt acceleration is 0.15 m/s 2 and that of the AMT output shaft's equivalent angular acceleration is 3 rad/s 2 correspondingly. The ideal time of the acceleration process under the first gear position is 4.8s, and that of the ascent acceleration stage or the descent acceleration stage should be 1.2s calculated by Equation (9) if N is 4. The ascent acceleration stage will be finished if the value of the ideal angular acceleration of the AMT output shaft reaches 3 rad/s 2 .…”

“…Many scholars have proposed some "S" style speed curves. From the available literatures, five soft-starting acceleration curves exist for belt conveyors, including the constant acceleration curve, the sine acceleration curve, the triangle acceleration, the trapezoidal acceleration, and the parabola acceleration [9,10]. A reasonable acceleration starting curve can decrease belt vibration and belt accidents.…”

AMT Starting Control as a Soft Starter Using a Novel Data-Driven Method

“…Normally, the clutch friction disk is often worn which will affect the clutch torque transmissibility. Therefore, the clutch transmitting torque can be expressed in equation (6).…”

“…sampling time. Then, the discrete model of the transmitted torque of the new clutch can be expressed in equation (19) according to equation (6). The engaging solenoid valve can be fully closed if the duty ratio is less than 0.2 and can be fully opened if the duty ratio is greater than or equal to 0.8.…”

“…Many scholars have proposed some "S" style speed curves. From the available literatures, five soft-starting acceleration curves exist for belt conveyors including the constant acceleration curve, the sine acceleration curve, the triangle acceleration, the trapezoidal acceleration, and the parabola acceleration [6]- [7]. Reasonable acceleration starting curve can decrease belt vibration and belt accidents.…”