Abstract
Line start permanent magnet synchronous motors (LS-PMSM) are energy-efficient synchronous motors that can start asynchronously due to a squirrel cage in the rotor. The drawback, however, with this motor type is the chance of failure to synchronize after start-up. To identify the problem, and the stable operation limits, the synchronization at various parameter combinations is investigated. For accurate knowledge of the operation limits to assure synchronization with the utility grid, an accurate classification of parameter combinations is needed. As for this, many simulations have to be executed, a rapid evaluation method is indispensable. To simulate the dynamic behavior in the time domain, several modeling methods exist. In this paper, a discussion is held with respect to different modeling methods. In order to include spatial factors and magnetic nonlinearities, on the one hand, and to restrict the computation time on the other hand, a magnetic equivalent circuit (MEC) modeling method is developed. In order to accelerate numerical convergence, a mesh-based analysis method is applied. The novelty in this paper is the implementation of support vector machine (SVM) to classify the results of simulations at various parameter combinations into successful or unsuccessful synchronization, in order to define the synchronization capability limits. It is explained how these techniques can benefit the simulation time and the evaluation process. The results of the MEC modeling correspond to those obtained with finite element analysis (FEA), despite the reduced computation time. In addition, simulation results obtained with MEC modeling are experimentally validated.
Highlights
In recent years, the interest in high energy-efficient motors is growing, due to increasing energy prices and ecological awareness
An line start permanent magnet synchronous motors (LS-PMSM) has a squirrel cage rotor to help start the motor by generating an asynchronous torque, similar to the electromagnetic torque generated in an induction motor
Once the motor is synchronized to the utility grid, the asynchronous torque is zeroed, and the LS-PMSM behaves like a permanent magnet synchronous machine
Summary
The interest in high energy-efficient motors is growing, due to increasing energy prices and ecological awareness. The performance of line start permanent magnet synchronous motors (LS-PMSM) is dependent on design, grid and load parameters. In [17,23], a more complex air gap reluctance modeling for IPMSM taking slotting into account is presented This modeling method is used to compute the start-up torque in LS-PMSM [7]. Look-up tables (LUTs) are preprocessed, e.g., position-dependent reluctance matrices Based on these LUTs and simulations in the time domain in Simulink, the dynamic performance is discussed during the synchronization of the LS-PMSM motion with the grid frequency. Emphasis will be given to the nonlinear and position-dependent reluctances, the dynamic management of the reluctances and the MEC network These methods are used to discuss the synchronization capability of the LS-PMSM to the grid frequency. The simulation results obtained with the MEC model are compared to experimental results
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