Abstract
Finite-element analysis (FEA) is one of the most significant tools in the designing and analyzing of electrical machines, which mainly includes the transient-magnetic (TM), magnet-static (MS) and time-harmonic (TH) solutions. The transient-magnetic (TM) solution in FEA is capable of considering both the harmonic effects and eddy-current effects accurately, which makes it suitable for the induction machine (IM) simulation. However, the drawback of the TM FEA for the IM modelling is that it takes some time before reaching the steady state because of the longer numerical transient, which is affected by the inherent electromagnetic time constants of the IM directly. In this paper, a new approach is proposed to reduce the duration of the numerical transient of the IM in the time-stepping FEA so that the steady state can be achieved in a short time. The proposed approach is capable of creating an initial condition close to the final steady state for the simulation by eliminating or reducing the stator and rotor electromagnetic time constants separately. The stator electromagnetic time constant is eliminated by an initial current excitation (obtained by the TH solution or the analytical method) and the rotor electromagnetic time constant is reduced by a locked rotor model at the beginning of the simulation. Then the initial current excitation is switched to a voltage excitation and the locked rotor is turned to the rotating state at proper time. Finally, the proposed approach is tested and proved efficient to reduce the transients by two typical cases (a solid-rotor IM and a squirrel-cage IM) with 2D FEA.
Highlights
Finite-element analysis (FEA) has become very helpful and popular in the modelling of electrical machines in both academia and industry, owing to the rapid development of the modelling technologies and computational abilities, which makes the design and optimization of different types of electrical machines much more convenient than ever before [1]–[7]
To shorten the time taken by the numerical transient during the time-stepping FEA of an induction machine (IM) in the TM solution, a novel approach is proposed based on reducing the stator and rotor electromagnetic time constant, separately
The current source excitation is switched to a corresponding voltage source excitation and the locked rotor is turned to the rotating state
Summary
Finite-element analysis (FEA) has become very helpful and popular in the modelling of electrical machines in both academia and industry, owing to the rapid development of the modelling technologies and computational abilities, which makes the design and optimization of different types of electrical machines much more convenient than ever before [1]–[7]. Di et al.: Accelerating the Time-Stepping FEA of IMs in TM Solutions takes several supply periods to reach the steady state This numerical transient in some cases, e.g. in IM simulations, is very long because of the strong rotor eddy-current effects and very high rotor electromagnetic time constants. The use of appropriate initial values (for initialization of the TM solution) is one of the possible methods to shorten the numerical transient emersed in the TM solution during the IM simulation [24], [25] This approach is suitable for eddy-current issues in IMs and the computing speed is highly depended on the initial conditions including currents, voltages, and even magnetic field distributions. The simulation time is very long, which is sometimes not acceptable, especially in the multiparameter optimization
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