Semi-Analytical Magnetic Field Calculation for Dual-Rotor Permanent-Magnet Synchronous Machines by Using Hybrid Model

Abstract

Based exclusively on the exact subdomain (SD) technique and finite-difference method (FDM), this paper proposes a two-dimensional (2-D) hybrid model (HAM) for the semi-analytical magnetic field calculation in electrical machines at no-/on-load conditions. It is applied to dual-rotor permanent-magnet (PM) synchronous machines. The magnetic field is computed by solving Laplace's and Poisson's equations through exact SD technique in all regions at unitary relative permeability (i.e., PMs, air-gap and slots) with a numerical model based on FDM in ferromagnetic regions (i.e., teeth and rotor/stator yokes). These two models are specifically coupled in both directions (i.e., 𝒓and 𝜽-edges) of the (non-)periodicity direction (i.e., in the interface between teeth regions and all its adjacent regions as slots and/or air-gap). To provide accurate solutions, the current density distribution in slots regions is modeled by using Maxwell's equations. Finiteelement analysis (FEA) demonstrates highly accurate results of the developed technique. The 2-D HAM is ≈ 6 times faster than 2-D FEA.

Harmonic Closed-loop Model Combined Predictive Fault-tolerant Control of Double Parallel Rotor Permanent Magnet Synchronous Motor

“…This model was based on the precise subdomain technique and finite difference method, addressing the common modeling challenges in motor design considering nonlinearity and magnetic saturation effects. This approach aimed to enhance the computational efficiency and accuracy of results [8]. In addressing the issue of low internal space utilization in singlerotor motors, Wu and his colleagues designed four different dual-rotor permanent magnet synchronous motors.…”

“…In Equation ( 7), L(s) represents the denominator polynomial of the closed-loop identification model, while M (s) and N (s) are the two components of the transfer function, as detailed in Equation (8). Equation ( 8) is arranged to yield the standard form of the transfer function; therefore, Equation ( 9) is obtained.…”

Full-Domain Harmonic Potential Balance Model for 2-D Magnetic Field Analysis of Electrical Machine

“…Generally, the methodologies for analytical models of electrical machines include two types: modeling based on magnetic equivalent circuits (MEC) [3]- [4], and modeling based on Maxwell's field equations [5]. Although MEC models are considered to have issues of inaccuracy, they are still widely applied in analyzing electrical machines [6].…”

Analysis of Detent Force in Flat‐Type Permanent Magnet Linear Synchronous Motor and Multi‐Objective Optimization Based on Parameter Classification

“…Currently, many modeling methods have been employed, such as Subdomain (SD) method [3,12], Schwarz‐Christoffel (SC) method [13], finite element method (FEM) [14,15] and nonparametric modeling method [16,17], etc. Each method has its own advantages and disadvantages.…”