Abstract
Permanent magnet synchronous motor (PMSM) possesses the advantages of low power loss, high power density and high torque density and, hence, has achieved broad applications in both industrial drives and home appliances. With the increasing demands for high power density, the PMSM often operates at high speed and high frequency, leading to high power loss and temperature rise. Consequently, proper consideration of power loss, including the core loss, has attracted much attention for the modelling, designing, controlling and optimizing of PMSMs. However, the widely used equivalent circuit model, capable of providing good analysis results with fast calculation, often ignores the core loss, which may lead to unsatisfactory motor performance. This paper aims to investigate the development of equivalent circuit models, with predictable core loss for PMSMs, and proposes novel equivalent circuit models, which improve the core loss prediction accuracy in the load conditions. Some thoughts about the further improvement of the models are proposed and discussed.
Highlights
A permanent magnet (PM) synchronous motor (PMSM) is a kind of synchronous motor with permanent magnets to provide the field excitation
This paper aims to present the development of the Permanent magnet synchronous motor (PMSM) equivalent circuit models considering the core loss
In Colby and Novotny’s original work, the equivalent core loss resistance Rc is modelled as a single-valued resistance, and it was evaluated by measuring the torque required to drive the PMSM as a generator at no-load conditions
Summary
A permanent magnet (PM) synchronous motor (PMSM) is a kind of synchronous motor with permanent magnets to provide the field excitation. The thermal effects due to the power loss, including core loss, directly influence the irreversible demagnetization of PM, the cooling design, and the volume of PMSMs. proper core loss calculation and modelling have significant influences on the performance, efficiency and temperature rise in PMSMs. The equivalent circuit model (ECM) is the most widely used method for electric machine analysis. In limited application for modern high-performance PMSM design and control In both traditional vector control and in flourishing model predictive control of PMSMs, the both traditional vector control and in flourishing model predictive control of PMSMs, the ECM lays the basis for establishing the control strategies and, excluding the core.
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