Design Optimization of a Reluctance Lead Screw for Wave Energy Conversion

Abstract

A reluctance lead screw (RLS) is proposed in this paper which consists of a rotor and a translator, forming a magnetic device that is able to transfer low-speed linear motion into high-speed rotational motion. Permanent magnets (PMs) are only installed in the rotor, making it more suitable for long-stroke applications. The design aspects are assessed by finite element analysis (FEA) and the performance is evaluated. In addition, the thrust force per magnet volume is presented for evaluating the utilization rate of the PMs. The simulation results show that RLS has an advantage in terms of the PM utilization rate. A new method for realizing spiral magnets has also been developed which can not only reduce the manufacturing difficulties, but also ease the installation work. Finally, based on the simulations and analyses, two RLS prototypes designed for wave energy converters (WECs) are presented to show the potential applications of this novel topology.

Sliding mode control strategy based lead screw control design in electromechanical tracking drive system

“…Similarly, with the input control signal u1(t) as shown in Figure 8, the quality of tracking the position of the lead screw system when using the proposed sliding controller as shown in Figure 9 is also better than that of the lead screw system with conventional PID controller simulation results Figure 5. Moreover, these results compare with the literature [19], [23], the results of this paper are better, because there are smaller tracking errors, leading to better control quality.…”

“…The controller and speed controller of the lead screw system has always been tracking according to the position and set speed with a small tracking error, after a short period of time. Therefore, the position controller of the lead screw control system always follows the set trajectory with a very small error, compared with previous works [17], [19], [20], [23], the results of this paper are better, which proves that the quality of the controller has met the control requirements with high accuracy for the CNC machine tool system. On the basis of the built-in state observer, the results show that the observer has evaluated the value of the controller's impact noise with a small tracking error.…”

“…Syriac and Chiddarwar in [20], proposed an algorithm to reduce the tracking error on the rotation axis of the ISSN: 2088-8694  Sliding mode control strategy based lead screw control design in … (Tran Duc Chuyen) 151 electromechanical tracking system with different thread pitch and its influence on the lead screw. In [23] studies the algorithm to evaluate the lead screw system applied to the hydraulic control system. Syriac and Chiddarwar [20], Tian et al [23] both only study theory and stop at simulation, but have not entered into experimental and control programming.…”

“…In [23] studies the algorithm to evaluate the lead screw system applied to the hydraulic control system. Syriac and Chiddarwar [20], Tian et al [23] both only study theory and stop at simulation, but have not entered into experimental and control programming. As mentioned above, the lead screw drive system for machine tools has the characteristic that during the working process there are always impact disturbances such as friction force, elastic moment, the effect of clearance when reversing rotation, jet, and affects the quality of the controller causing errors when controlling [2], [5], [6], [9], [14], [17], [18], [24].…”