Abstract
Finite Element Method (FEM) analysis tools are the most adopted in the design of brushless alternating current motors due to the advantage of considering multi-physics effects with dependencies of variables such as cross-coupling, saturation and others that are not possible to be modeled analytically with high precision. During the design process designers compute operation points such as maximum torque per ampere or flux weakening characteristics that cannot be targeted directly on the FEM tool. Therefore, designers make a sweep of simulations and post-processed the data in order to obtain the results, this is repetitive particularly in the conceptual phase of the design where features of the motor are still not defined. This paper presents nine algorithms as an alternative to compute with iterative methods operation points that cannot be targeted directly on a FEM tool. The algorithms must be coupled to the FEM tool and can compute complex points such as the characteristic current and modes of operations limits within acceptable range of error and times of execution for practical purposes. Validation of the algorithms using Jython is presented with results for the three types of brushless motors (non-salient, interior permanent magnet and reluctance motor).
Highlights
Three-phase brushless drive systems, especially those based on permanent magnets motors, have proven to be a good solution for high efficiencies and compactness requirements
Algorithm 8 assumes the limit is given by the voltage, it iterates along the maximum torque per Ampere (MTPA) curve using Algorithm 5 until the voltage is found as illustrated in Figure 1, in this case we do not take into account the current or torque limit, the user criteria must decide if the point is valid or not
If changes to the model are automated with scripts and the algorithms are used inside them, these provide the possibility to generate different machine candidates within the same finite element method (FEM) tool taking into account all multi-physics effects of FEM
Summary
Three-phase brushless drive systems, especially those based on permanent magnets motors, have proven to be a good solution for high efficiencies and compactness requirements. This paper is focused on developing fast algorithms to obtain the motor key operation points performance in order to compare a high set of machine candidates For this purpose, different approaches were considered:. Ampere per torque (MAPT), maximum torque per voltage (MTPV), the speed for a voltage and current limit, characteristic or short circuit current (Ich ), the maximum power point during flux weakening, the CPSR and the boundary transition point from FW to MTPV control Their logic intention was developed to work for the three types of brushless AC motor obtaining reliable approximations with the least number of simulation step points and iterations possible, in shorter times compared to a full simulation process, yet still flexible as to whether or not more steps are needed.
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