Abstract
C-core linear flux-switching permanent magnet (PM) machines (LFSPMs) are attracting more and more attention due to their advantages of simplicity and robustness of the secondary side, high power density and high torque density, in which both PMs and armature windings are housed in the primary side. The primary salient tooth wound with a concentrated winding consists of C-shaped iron core segments between which PMs are sandwiched and the magnetization directions of these PMs are adjacent and alternant in the horizontal direction. On the other hand, the secondary side is composed of a simple iron core with salient teeth so that it is very suitable for long stroke applications. However, the detent force of the C-core LFSPM machine is relatively high and the magnetic circuit is unbalanced due to the end effect. Thus, a new multiple additional tooth which consists of an active and a traditional passive additional tooth, is employed at each end side of the primary in this paper, so that the asymmetry due to end effect can be depressed and the detent force can be reduced by adjusting the passive additional tooth position. By using the finite element method, the characteristics and performances of the proposed machine are analyzed and verified.
Highlights
Cableless elevator systems based on linear machines are very attractive, since they can eliminate the drawbacks of conventional traction-geared cable elevators, such as the vertical oscillation and height limit caused by the strength and weight of cable [1], especially in case of the skyscrapers of200–400 m height
In [3], a linear permanent magnet (PM) synchronous machine (LPMSM) is adopted for cableless elevators because of its high efficiency and high power density, in which the armature windings are laid along the hoistway and can be controlled section by section according to the elevator vehicle position
A C-core linear versions of FSPM (LFSPM) machine is proposed for long stroke applications such as
Summary
Cableless elevator systems based on linear machines are very attractive, since they can eliminate the drawbacks of conventional traction-geared cable elevators, such as the vertical oscillation and height limit caused by the strength and weight of cable [1], especially in case of the skyscrapers of. 10, 318 a simple and cheap iron core with salient teeth, so the linear counterpart of the stator PM machine, namely the linear primary PM machine, is very suitable for long stroke applications, such as their advantages such as the simple and robust structure of the rotor [6,7] Both the PMs and armature cableless elevators and urban rail transit systems, in which the primary and the secondary can be windings of stator PM machines are housed in the stator, and the rotor is composed of a simple and designed as the short side and long side, respectively, to integrate the high efficiency and power cheap iron core with salient teeth, so the linear counterpart of the stator PM machine, namely the density performances of LPMSMs andsuitable the lowforcost merit ofapplications, LSRMs. FSPM machineaspossesses and urban rail transit in which the and the secondary be designed the short the merits of higher power density and torque density [8], sinusoidal no-load.
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