Computationally Efficient PM Power Loss Mapping for PWM Drive Surface-Mounted Permanent Magnet Synchronous Machines

Abstract

This paper proposes a computationally efficient approach for mapping permanent magnet (PM) power loss in permanent magnet synchronous machines (PMSMs). The PM loss mapping method here uses time-step finite element analysis (FEA) to determine the function parameters representing the loss variation with speed (frequency), amplitude modulation ratio, carrier ratio, and stator current and is suitable for rapid evaluation of machine performance over the entire torque–speed envelope. The PM loss can be accurately mapped across the full operational envelope, including the field-weakened mode. The loss mapping procedure takes into account the equivalent resistivity of axial segmentation of the PM array calculated by three-dimensional (3-D) FEA. The effect of temperature on the PM loss is also considered. The proposed methodology is validated on two surface-mounted PMSM designs. The results of the loss mapping procedure are consistent with those from direct 3-D finite element prediction and experimental results of PM power loss at each operating point of the machine.

Research on Rotor Loss and Rotor Structure Optimization of Rare Earth Permanent Magnet Synchronous Motors in the Weak Field Area

“…In [20], Guohui Yang et al focused on the influence of stator slot opening of permanent magnet synchronous motor on the loss of permanent magnets. Reference [21] proposes a new calculation method for power loss of permanent magnet based on a two-dimensional finite element and fitting method which can achieve the balance of rapidity and accuracy of calculation of permanent magnet loss with sinusoidal input. In general, the rotor loss in PMSM mainly includes rotor core loss and permanent magnet loss which are caused by the air gap permeability, the space harmonic, and the time harmonic caused by the stator current.…”

“…In [20], Guohui Yang et al focused on the influence of stator slot opening of permanent magnet synchronous motor on the loss of permanent magnets. Reference [21] proposes a new calculation method for power loss of permanent magnet based on a twodimensional finite element and fitting method which can achieve the balance of rapidity and accuracy of calculation of permanent magnet loss with sinusoidal input.…”

Losses in Efficiency Maps of Electric Vehicles: An Overview

“…Therefore, consideration of the PM loss without investigation of hysteresis loss is not accurate. The loss mapping technique is a type of the analytical modelling to the PM losses [129,130,139]. It is fast, but limited to a type of the magnet, shape of the rotor, and shape of the stator.…”

“…In these models, the eddy current loss is the only investigated portion of the PM loss and the hysteresis PM loss is ignored [22]. It was shown that the hysteresis losses are approximately two times of the eddy current losses in PMs [139]. Therefore, consideration of the PM loss without investigation of hysteresis…”

Synchronous Machine Winding Modeling Method Based on Broadband Characteristics

“…A power system's safe operation determines whether human activities are carried out normally, so the reliability of a power system is a very relevant issue for people today [1][2][3]. At the heart of the power industry's energy supply are large-scale synchronous machines, of which regular operation determines whether a power system is adequately supplied with energy [4,5]. As a critical component of a synchronous machine, winding may cause defects, such as winding turn-to-turn faults and grounding short-circuits during synchronous machine operation [6].…”