Performance Analysis of High-Speed Electric Machines Supplied by PWM Inverters Based on the Harmonic Modeling Method

Abstract

This paper presents a method for the performance analysis of high-speed electric machines supplied with pulse-width modulated voltage source inverters by utilizing a fast analytical model. By applying a strict mathematical procedure, effective expressions for the calculation of rotor eddy current losses and electromagnetic torque are derived. Results obtained by the approach suggested in this study are verified by the finite element model, and it is shown that the proposed method is superior in comparison to the finite element method in terms of computation time. The proposed method enables fast parameter variation analysis, which is demonstrated by changing the inverter switching frequency and electric conductivity of the rotor and analyzing the effects of these changes on rotor eddy current losses. The presented work separately models effects of the permanent magnet and pulse-width modulated stator currents, making it suitable for the analysis of both high-speed permanent magnet machines and high-speed induction machines.

Design, Modeling, and Control of Rotating and Linear Electric Machines for Automotive Applications

“…The accepted contributions are listed in the references section [1][2][3][4][5][6][7][8]. They can all be accessed through the following link: https://www.mdpi.com/journal/energies/special_ issues/rotating_and_linear_permanent-magnet_Machines (accessed on 29 July 2023).…”

“…Among the eight accepted papers, seven are research articles [1][2][3][4][5][6][7], and one is a review paper [8]. Contribution [1] presents the control strategy of a fault-tolerant permanent magnet synchronous motor.…”

“…Contribution [4] concerned the evaluation of an analytical modeling approach (which the authors called the "Harmonic Modeling Method") for the analysis of high-speed machine performance. The authors considered the harmonics present in the armature currents due to the PWM technique used in the inverter supplying the machine.…”

“…While contributions [1][2][3][4][6][7][8] concern rotating electric machines, contribution [5] is the only paper dedicated to linear machines. The authors analyzed different single-phase tubular linear permanent magnet machines, and compared different original structures with partitioned stators, and a passive mover was sandwiched between two stators.…”

Semianalytical Modeling for Linear Motors With Conductive Media in High-Dynamic Applications

“…I N THE development of electrical machines, eddy-current effects on losses and forces need to be computed for designing motors that are energy efficient [1], [2], [3], operate within thermal conditions set by the environment [4], [5], [6], or perform precise and repeatable motion [7], [8], [9], [10]. Conventionally, finite-element-analysis (FEA) is used for this analysis.…”