Limits...
A double-sided linear primary permanent magnet vernier machine.

Du Y, Zou C, Liu X - ScientificWorldJournal (2015)

Bottom Line: The key of this new machine is the introduction of double stator and the elimination of translator yoke, so that the inductance and the volume of the machine can be reduced.Hence, the proposed machine offers improved power factor and thrust force density.The electromagnetic performances of the proposed machine are analyzed including flux, no-load EMF, thrust force density, and inductance.

View Article: PubMed Central - PubMed

Affiliation: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China.

ABSTRACT
The purpose of this paper is to present a new double-sided linear primary permanent magnet (PM) vernier (DSLPPMV) machine, which can offer high thrust force, low detent force, and improved power factor. Both PMs and windings of the proposed machine are on the short translator, while the long stator is designed as a double-sided simple iron core with salient teeth so that it is very robust to transmit high thrust force. The key of this new machine is the introduction of double stator and the elimination of translator yoke, so that the inductance and the volume of the machine can be reduced. Hence, the proposed machine offers improved power factor and thrust force density. The electromagnetic performances of the proposed machine are analyzed including flux, no-load EMF, thrust force density, and inductance. Based on using the finite element analysis, the characteristics and performances of the proposed machine are assessed.

No MeSH data available.


Elevator configuration.
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fig1: Elevator configuration.

Mentions: At present, the linear induction machine (LIM) [4, 5], the linear switch reluctance machine (LSRM) [2], and the linear permanent magnet (PM) synchronous machine (LPMSM) [6, 7] have been proposed for the primary propulsion of vertical transportation systems. It is well known that the LIM has been developed for many years for its simple mechanical structure, low cost, and high reliability. Thus, it is easy to compete with the existing traditional elevators. However, the efficiency and the power factor of the LIM are relatively low [8]. Generally, in order to reduce the rated power of drive machine, the rope is still used to connect the elevator vehicle and the counterweight, in which the LIM is installed. So, the LIM elevator is not very much different from the conventional elevator. In [2], a new double-sided LSRM, which possesses the merits of simple construction, mechanical robustness, and fault tolerance, has been proposed for ropeless elevator, as shown in Figure 1. However, due to its inherent high force ripple and noise especially in low speed, the LSRM has not yet been widely applied [9]. In addition, compared with PM machines, the power density and operating efficiency of the LSRM are relatively low [10]. With the quick development of rare earth PM materials, researches on LPMSM have been gradually prompted. Due to the utility of the PMs, the LPMSM can offer the advantages such as high efficiency and high power density. However, the cost of the LPMSM is quite high in the long-stroke applications such as elevators in high buildings, whether PMs or windings are placed on the long side.


A double-sided linear primary permanent magnet vernier machine.

Du Y, Zou C, Liu X - ScientificWorldJournal (2015)

Elevator configuration.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4385675&req=5

fig1: Elevator configuration.
Mentions: At present, the linear induction machine (LIM) [4, 5], the linear switch reluctance machine (LSRM) [2], and the linear permanent magnet (PM) synchronous machine (LPMSM) [6, 7] have been proposed for the primary propulsion of vertical transportation systems. It is well known that the LIM has been developed for many years for its simple mechanical structure, low cost, and high reliability. Thus, it is easy to compete with the existing traditional elevators. However, the efficiency and the power factor of the LIM are relatively low [8]. Generally, in order to reduce the rated power of drive machine, the rope is still used to connect the elevator vehicle and the counterweight, in which the LIM is installed. So, the LIM elevator is not very much different from the conventional elevator. In [2], a new double-sided LSRM, which possesses the merits of simple construction, mechanical robustness, and fault tolerance, has been proposed for ropeless elevator, as shown in Figure 1. However, due to its inherent high force ripple and noise especially in low speed, the LSRM has not yet been widely applied [9]. In addition, compared with PM machines, the power density and operating efficiency of the LSRM are relatively low [10]. With the quick development of rare earth PM materials, researches on LPMSM have been gradually prompted. Due to the utility of the PMs, the LPMSM can offer the advantages such as high efficiency and high power density. However, the cost of the LPMSM is quite high in the long-stroke applications such as elevators in high buildings, whether PMs or windings are placed on the long side.

Bottom Line: The key of this new machine is the introduction of double stator and the elimination of translator yoke, so that the inductance and the volume of the machine can be reduced.Hence, the proposed machine offers improved power factor and thrust force density.The electromagnetic performances of the proposed machine are analyzed including flux, no-load EMF, thrust force density, and inductance.

View Article: PubMed Central - PubMed

Affiliation: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China.

ABSTRACT
The purpose of this paper is to present a new double-sided linear primary permanent magnet (PM) vernier (DSLPPMV) machine, which can offer high thrust force, low detent force, and improved power factor. Both PMs and windings of the proposed machine are on the short translator, while the long stator is designed as a double-sided simple iron core with salient teeth so that it is very robust to transmit high thrust force. The key of this new machine is the introduction of double stator and the elimination of translator yoke, so that the inductance and the volume of the machine can be reduced. Hence, the proposed machine offers improved power factor and thrust force density. The electromagnetic performances of the proposed machine are analyzed including flux, no-load EMF, thrust force density, and inductance. Based on using the finite element analysis, the characteristics and performances of the proposed machine are assessed.

No MeSH data available.