High Accuracy Modeling of Permanent Magnet Synchronous Motors Using Finite Element Analysis

Abstract

Permanent magnet synchronous machines (PMSMs) have garnered increasing interest because of their advantages such as high efficiency, high power density, wide speed range, and fast dynamics. They have been employed recently in several industrial applications including robotics and electric vehicles (EVs). However, PMSMs have highly nonlinear magnetic characteristics, especially interior PMSMs, due to the existence of reluctance torque. Nonlinearity complicates not only machine modeling but also control algorithms. An accurate machine model is the key aspect for the prediction of machine performance as well as the development of a high-performance control algorithm. Hence, this paper presents an accurate modelling method for PMSMs. The proposed model method is applicable for all PMSMs, even multiphase machines. This paper considers a fractional slot concentrated winding 12/10 interior PMSM (IPMSM) for this study to demonstrate the effect of magnetic saturation and special harmonics. The developed model considers accurately the magnetic saturation, mutual coupling, spatial harmonics, and iron loss effects. It utilizes finite element analysis (FEA) to estimate the precise magnetic characteristics of IPMSM. The finite element model is calibrated precisely using experimental measurements. The iron losses are estimated within the simulation model as d- and q-axes current components. The model accuracy is validated experimentally based on a 12/10 IPMSM prototype.

Optimization of an IPMSM for Constant-Angle Square-Wave Control of a BLDC Drive

“…As such machines were highly saturated due to their high power densities, and a FEM model was used to simulate the performance. Parameter identification of a saturated IPMSM was discussed in [21], where [22] used a FEM model to model the IPMSM accurately. In the next step, a multi-objective optimization of the rotor and pole shoe geometry was performed to enhance the performance.…”

Nonlinear Magnetic Model of IPMSM Based on the Frozen Permeability Technique Utilized in Improved MTPA Control

“…Certainly, approaches using FEA for flux map calculation are also widespread in the literature [8,[15][16][17]. In Ref.…”

“…The inverse flux maps of IPMSM were obtained using FEA in Ref. [17], but this technique does not account for the offset in the inverse flux map resulting from the excitation caused by permanent magnets. The frozen permeability technique is also used in Ref.…”

Field Oriented Control of Brushless Direct Current Motor for Electric Vehicle Robot Obstacle Detection and Avoidance

“…The idea of field-oriented control, often known as vector control, was put forth by F. Blascke in 1971. The d-q reference frame is the basis for the mathematical model of the PMSM [6]. The motor model is instantly changed in these two references frame system, the ABC coordinate system to the DQ coordinate system.…”