Synchronous Reluctance Machines with Auxiliary Magnet Structures -A Review

Permanent Magnet-Assisted Synchronous Reluctance Motors (PMaSynRM) are a class of motors that combine the benefits of Synchronous Reluctance Motors (SRM) and Permanent Magnet (PM) motors, offering significant advantages in terms of efficiency, torque density, and reduced energy losses. This paper investigates the structural characteristics and control strategies for PMaSynRM motors, with a focus on optimizing their performance across a wide range of operating speeds. The primary aim of this study is to explore the impact of various control methods, including Maximum Torque Per Ampere (MTPA), efficiency optimization, and minimization of input KVA, while maintaining a constant torque output. The research examines the operational challenges of PMaSynRM motors, such as their performance at high speeds, and introduces flux weakening control techniques to extend their speed range. Additionally, the paper discusses the critical factors that influence motor performance, such as torque production, efficiency, and the interaction between the reluctance torque and magnetic torque components. Various control strategies are analyzed for both sub-nominal and super-nominal speed ranges. In sub-nominal operation, strategies like MTPA, Maximum Efficiency Control (MEC), and Cross-Linked Magnetic Flux (CMFL) are investigated to maximize the efficiency and torque output while minimizing power losses. For high-speed operation, flux weakening control methods are employed to maximize the motor's torque production by adjusting the stator current. These strategies ensure optimal motor operation across a wide speed range, reducing energy consumption and system costs. The results show that implementing these control strategies allows for improved overall performance, ensuring efficient operation even under varying operating conditions. The findings of this study provide valuable insights into the potential of PMaSynRM motors for various industrial applications, where energy efficiency, cost-effectiveness, and high-performance operation are critical requirements.

کلیدواژه ها:

PMaSynRM ، Control Strategies ، MTPA ، Flux Weakening ، Efficiency