Cogging force mitigation techniques in a modular linear permanent magnet motor

Tootoonchian, F.; Nasiri‐Gheidari, Zahra

doi:10.1049/iet-epa.2015.0575

Cited by 17 publications

(5 citation statements)

References 20 publications

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“…• Requires very exact position recordings to function; [79]- [85] synchronous speed (v s ) that is faster than the mechanical speed (v), according to the relation…”

Section: A Short Primary -Linear Induction Motor (Sp-type Lim)mentioning

confidence: 99%

Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

Nøland

2021

IEEE Access

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The present article outlines the core technologies needed to realize the Hyperloop transportation system (HTS). Currently, the HTS vacuum tube train concept is viewed as the fastest way to cross the earth's surface. However, the concept has not yet been demonstrated for subsonic or near-sonic speeds in large-scale implementations. Among the challenging technical areas are the tube's depressurization, the capsule's air resistance, and choked flows occurring around the capsule. There is also a need for effective levitation and propulsion solutions compatible with the velocities being proposed. Moreover, several conflicting objectives have been identified in the HTS design. It is highlighted that the tubes should be wide enough to lower the capsule's drag forces but that a large-sized tube comes at the expense of higher operational energy costs and infrastructure investments. Another struggle is aiming at a low-cost passive track design and, and at the same time, a lightweight vehicle. One technical path is to turn the whole guideway into an electric propulsor, arriving at a 'lightweight capsule solution' (LCS). Alternatively, the vehicle could be transformed into a 'modified airplane' that stores massive amounts of onboard energy, yielding an energy-autonomous 'low infrastructure solution' (LIS). In a case study, it is shown that even LIS technology is compatible with short-haul flights (1500 km) but that it requires an energy reservoir of about 30 % of the capsule's overall mass. Results and discussions presented in this paper are supported by analytical predictions with parameters or input data either supported by referred simulations or experiments. In general, the paper aims to open up the discussion, provide a sufficient understanding of the Hyperloop field's multidisciplinary aspects, and establish a foundation for further investigations. In the end, new research tasks have been defined, which have the potential to go beyond the state of current knowledge.

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“…• Requires very exact position recordings to function; [79]- [85] synchronous speed (v s ) that is faster than the mechanical speed (v), according to the relation…”

Section: A Short Primary -Linear Induction Motor (Sp-type Lim)mentioning

confidence: 99%

Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

Nøland

2021

IEEE Access

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“…To explain the proposed mover structure, which is based on the use of a variable air‐gap length, the cogging force analysis is presented in this section. The thrust of the rare‐earth PMSLM is determined by using the co‐energy as [11]:

F = \frac{\partial W}{\partial x} |_{i = c o n s t a n t}

…”

Section: Topology Of Rare‐earth Permanent Magnet Synchronous Linear M...mentioning

confidence: 99%

Comparison of rare‐earth and hybrid‐magnet mover configurations for a permanent magnet synchronous linear motor

Liu

Gerada

et al. 2021

IET Electric Power Appl

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Force ripple and cost reduction are two of the main challenges in optimising the design and increasing the market uptake of permanent magnet synchronous linear motors (PMSLM). Two mover configurations are compared in depth; one made entirely from rare-earth materials while another consisting of a hybrid (rare-earth/ferrite) magnet layout. First, the rare-earth PMSLM is optimised and designed. Based on the same design and simulation methods, a hybrid PM materials with structure PMSLM is then proposed, optimised and designed using NdFeB at the centre pole-section and ferrite at the edges. The two configurations of the PMSLM and their relative merits/demerits are compared using the simulation results of the flux density distribution in the air gap, back electromotive force (EMF), and cogging force. The hybrid-magnet structure PMLSM has a better magnetic performance, and the force ripple is reduced by around 1%. Furthermore, the magnet material cost of the hybrid-magnet PMLSM is reduced by nearly 25% compared with the original PMLSM. Finally, a prototype of the rare-earth and hybridmagnet PMSLM is manufactured and tested to validate the modelling techniques and the results. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…In the preliminary electromagnetic design of motor, the original data of motor design is given from Table 3 according to the possible design limitation and conditions [14–16]. The inner diameter of drilling pipes is ∼72 mm (small‐size pipe).…”

Section: Design Of Electromagnetic Hammermentioning

confidence: 99%

Design and analysis of a new down‐the‐hole electromagnetic hammer driven by tube linear motor

Tang

et al. 2017

IET Electric Power Applications

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Percussive‐rotary drilling is an effective method for the hard rock drilling. As hydraulic and pneumatic hammers have many problems especially in the deep core drilling, a new electromagnetic hammer driven by a tube linear motor is introduced in this study. The study mainly covers the mechanical structure and electromagnetic design of the hammer, respectively. Due to the direct use of electric power, the electromagnetic hammer has the advantage of high efficiency while it must meet the minimal percussive energy requirement under the limitation of drill pipe diameter. In this study, the validity of electromagnetic design is verified through the finite‐element analysis software Ansoft/Maxwell 2D and numerical calculation of electromagnetic force. The working temperature in deep down‐hole is relatively high, the influence of high temperature in deep hole on the electromagnetic thrust of the linear motor is then analysed. A motion model of linear motor hammer is established to calculate and analyse the impact power and frequency under different conditions. The results show that the performance of linear motor hammer can reach or even exceed the one of same diameter hydraulic hammer, especially in the low‐frequency range. The prototype test also confirms the validity of the design.

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Cogging force mitigation techniques in a modular linear permanent magnet motor

Cited by 17 publications

References 20 publications

Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

Prospects and Challenges of the Hyperloop Transportation System: A Systematic Technology Review

Comparison of rare‐earth and hybrid‐magnet mover configurations for a permanent magnet synchronous linear motor

Design and analysis of a new down‐the‐hole electromagnetic hammer driven by tube linear motor

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