Optimization On An Asymmetric Bilateral Linear Switched Reluctance-based Drive Using DSP

In industry, some advanced manufacturing processes require linear motion systems, and some direct drive motion systems with the absence of intermediate mechanical devices have been investigated. Linear direct drive systems can directly realize linear motions, and they are characterized by high positioning precision, high force output density, low energy loss and so on. The systems have the advantages of simple structure, swift response and good flexibility. Linear switched reluctance motors are one type of the linear direct drives, which own a promising prospect. In this paper, an asymmetric bilateral linear switched reluctance motor based linear motion system is investigated that outweighs other linear switched reluctance motors. The ultimate goal of this paper is to investigate a drive system for the linear motion system to realize a high precision and position control.This paper first presents the structure and principles of the asymmetric bilateral linear switched reluctance motor. Control strategies have been researched in this paper. Based on software packages of Simplorer and Maxwell, the co-simulation on the linear motion control has been completed. Besides, the hardware and debugging of the drive for the asymmetric bilateral linear switched reluctance motor have also been completed, mainly including power suppliers design, convertors, detection of feedback signals, circuits for control platform and protection of the circuit, etc.The key point of the paper is the research, design and optimization of the drive system for the asymmetric bilateral linear switched reluctance motor. Research on current loop, including simulations and experiments has been carried out. The relationship between the current ripples and loss of MOSFET corresponding to pulse width modulation are derived. Then an optimization approach has been proposed and the design for the current loop has been accomplished.Finally, the software design and measurements for the drive of the asymmetric bilateral linear switched reluctance motor are conducted. The results reveal the effectiveness of the proposed method, by enhancing the positioning precision and reducing the switching losses for the machine. An optimized control for the current loop of the driving system can be thus achieved.