A Generalized Per-Phase Equivalent Circuit Model of the PMSM With Predictable Core Loss

Abstract

Equivalent circuit model (ECM) of the permanent magnet (PM) synchronous motor (PMSM) lays the foundation of the motor analysis, design, optimization, and control. However, the most widely used ECM of the PMSM ignores the core loss, which accounts for a considerable part of the electromagnetic loss and may exceed the copper loss in the medium and high-speed ranges. Previous researches of ECMs with predictable core loss are hard to satisfy the prediction precision over a broad range of speed and current. Therefore, a generalized per-phase ECM of the PMSM with predictable core loss is proposed. The proposed ECM topology and parameter identification method can effectively enhance the prediction accuracy of both the no-load and load core loss, and each component of the core loss in terms of the hysteresis, eddy current, and anomalous loss can be analyzed separately. Apart from the core loss, the proposed ECM has better precision in predicting the motor's output performance, such as mechanical characteristics, compared with traditional ECMs. The merits of the proposed ECM have been experimentally validated on the prototype of a PM transverse flux synchronous motor. This proposed ECM can be promotionally employed in other control strategies, such as model predictive control, to improve the PMSM performance.