Abstract
This paper considers a linear tubular permanent magnet motor (LTPMM) for an active suspension system. The LTPMM has an end effect due to its structure. This can be an important factor for analysis and design of the LTPMM because it distorts the air-gap magnetic flux distribution. The field reconstruction method (FRM) was developed for an effective evaluation of the magnetic field in the electric machine. It can reduce the computation time using the basis-function which reconstructs the air-gap magnetic flux distribution with a static finite element analysis. In this paper, we adopted the FRM to evaluate the LTPMM. However, the FRM has been applied only to the rotating machines and does not take into account the distortion of the magnetic flux distribution in the LTPMM. To deal with this problem, we proposed an enhanced FRM with new basis-function. The proposed method is verified by comparing between experiment result, conventional and enhanced FRM.
Highlights
In the automotive industry, the current and the future trend are becoming more electrified vehicles
Since the basis-function of the conventional field reconstruction method (FRM) selects the reference magnetic flux distribution when the mover is located at the initial time, at Point A, the error between the FRMs and the finite element method (FEM) is 3.45%
The contribution of this paper is to present a method for fast evaluation of the force calculation and magnetic flux distribution of linear motors using the FRM
Summary
The current and the future trend are becoming more electrified vehicles. The LTPMM is structurally accompanied by a longitudinal end effect, which distorts the magnetic flux distribution in the air-gap [16], [17] This effect can be further increased because the electromagnetic active suspension has a shorter stroke. If one of three waveforms is selected as the reference magnetic flux distribution, the basis-function will sweep this difference at all mover positons It will distort the overall air-gap magnetic flux density and eventually results in unexpected characteristics. BASIS FUNCTION: STATOR In the proposed FRM, the air-gap magnetic flux density generated by the armature reaction is expressed as follows: Bs(t) = Fs · Is(t) Is(t) = is, (t + θ1). The difference between the results of the FRM and FEM is acceptable below 2.8%
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