Fast Demagnetization and Vibration Reduction in Switched Reluctance Motor Drive System

Abstract

In this paper, a Switched Reluctance Motor (SRM) drive system is proposed to make a trade-off between torque profile and vibration amplitude. In the proposed drive system, the power factor correction and fast demagnetization are achieved using a single-phase Vienna rectifier as a front-end converter for SRMs with a nominal voltage equal to half DC-link voltage. The three-level Vienna rectifier provides doubled negative voltage in demagnetization, resulting in a shorter current tail and faster demagnetization. But, Applying higher voltage in demagnetization has a negative impact on the vibration amplitude at the point of demagnetization. Therefore, a control algorithm is designed to apply a negative modulated voltage to the motor phase, with a minimum change rate at the beginning of demagnetization and a linear average during the demagnetization interval. Accordingly, the mitigation of the vibration occurring at the commutation point and prevention of negative torque are simultaneously achieved over a wide speed range. The simulation and experimental results demonstrate the proposed drive system's positive effect on the vibration amplitude, grid side current quality, and SRM performance in a wide range of speed variations.

Advancements in Flux Switching Machine Optimization: Applications and Future Prospects

“…To mitigate vibrations in FSMs, specific attention must be paid to high-amplitude and low-order exciting force components. Additionally, it is essential to compare the modal frequencies and frequencies of each order of exciting force to prevent beating vibrations or resonance [105]. Minimizing radial forces is of utmost importance to ensure smooth and reliable machine operation and enhance overall performance.…”

“…Extensive research has been conducted on unbalanced forces and vibrations in various types of electric machines including switched reluctance machines [105]- [107], fractional slot concentrated winding surface permanent magnet machines [102], [108], [109], induction machines [110], [111], wound-field synchronous machines [112], [113], and interior permanent magnet machines [104], [114], [115]. Different design approaches have been proposed to mitigate electromagnetic vibrations by modifying the geometric dimensions and topologies of the machines.…”