Basic study of optimal design of linear motor for rope-less elevator

Takahashi, Norio; Yamada, T.; Miyagi, Daisuke; Markon, Sandor

doi:10.1049/cp:20080261

Cited by 12 publications

(8 citation statements)

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“…[11][12][13] In the recent decade, more academic studies of linear motor driven multicar elevators have been conducted. 14,15 In their studies, the imperative employment of linear motors to drive ropeless elevators was affirmative. Linear induction motors and switched reluctance motors were considered before but their ratio of payload to self-weight was relatively low.…”

Section: History Of Development Of Ropeless Elevatorsmentioning

confidence: 99%

A study of linear PMSM driven ropeless elevators

Chan

2018

Building Services Engineering Research and Technology

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In recent years, buildings have become taller and wider. The conventional approach of one roped elevator car per hoistway seems increasingly impractical. The idea of ropeless elevators using linear motors was proposed more than 30 years ago, but it was merely treated as wishful thinking by the industry at that time due to lots of safety concerns. And discussion by the industry has mainly been qualitative in nature. In recent years, an international manufacturer announced the development of a prototype and the world's first installation may probably be open to public before the end of 2018. So far, academic studies have mainly focused on the study of linear motors with generic applications, while this paper focuses on the performance of the motor drive from an elevator's point of view. In this paper, we investigate the mechanism of the drive, and the linear permanent magnet synchronous motor and, by discretizing the equations of the full mathematical model, we fine tune the parameters and design suitable controllers. We evaluate its performance by computer simulation, based on the necessary kinematics of a real elevator, so as to arrive at some design guidelines. Finally, the most critical safety concern, i.e. free fall during a total power failure, is quantitatively studied by short circuiting all motor windings. Methods to achieve a reasonably constant and low descending speed, have been studied with parameters estimated analytically, and are verified by simulation. For the sake of illustrating the concept as an initial trial, simplified circuit models, controllers and sensors are all assumed as being ideal. It is hoped that this paper will stimulate the research interest of both the academic world and the industry, while the inclusion of more losses, armature reactions, and imperfections, etc., could be tackled in a further study. Practical application: The application of one roped elevator car in taller and wider buildings seems increasingly impractical. This paper considers the analysis of the application of ropeless elevators using linear motors focusing on the performance of the motor drive from an elevator's point of view. A basic mathematical framework is developed to study and design the controllers and drive of a multi-car elevator system by using linear permanent magnet synchronous motors with emphasis on the elevator performance as a whole system. The paper is aimed at stimulating research interest to drive the appropriate analysis and application of linear permanent magnet synchronous motor driven ropeless elevators.

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Section: History Of Development Of Ropeless Elevatorsmentioning

confidence: 99%

A study of linear PMSM driven ropeless elevators

Chan

2018

Building Services Engineering Research and Technology

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“…In the conventional direct thrust control (DFC), using the voltage model, the primary flux observation equation is described as in (1).…”

Section: A Presentation Of Questionsmentioning

confidence: 99%

Simulation and Test Study on Direct Force Control for Permanent Magnet Linear Synchronous Motor

Wang¹,

Feng²,

Si³

et al. 2013

JCP

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Permanent magnet linear synchronous motor (PMLSM), which has the advantages of simple structure, small volume, high force, is a research focus and difficulties because of the thrust ripple and control problems for PMLSM. In this paper, in order to reduce thrust ripple and improve system control performance, the space voltage vector pulse width modulation technology (SVPWM) was introduced into the directing force control (DFC) strategy of PMLSM. In the running process, the temperature of PMLSM will rise, which changes the resistance of the primary winding. Full consideration of the change of the resistance in the motor running process, the error between the flux observed value and the actual value was analyzed. And then a new flux dynamic compensation algorithm based on flux dynamic compensation was proposed. The novel dynamic compensator was built to improve the observation accuracy of the primary flux, which solved effectively the wrong voltage vector choice and the system control performance failure due to the error of the primary flux. The Simulation and test results show that the PMLSM DFC based on SVPWM and the flux dynamic compensation has better control performance.

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“…Recently however, linear motors for drive of vertical loads in transportation have been also studied [7,8,9,10] where high thrust to weight ratio is required. A strong candidate is permanent magnet linear synchronous motors (PMLSM), which has become feasible in the recent years with the advances in permanent magnet technology where high coercivity permanent magnet material with low cost has become available [8,9,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Linear motor for multi--car elevators: design and position measurement

Gürbüz¹,

Kazan²,

Onat³

et al. 2011

Turkish Journal of Electrical Engineering and Computer Sciences

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Multi-car elevator is an emerging technology consisting of two or more elevator cars moving independently in an elevator hoistway, which has become more appealing as building heights increase. In this paper, the design and drive methodologies for a linear motor driven multi-car elevator system with independently moving cars is introduced together with experimental results. Additionally, a safety method developed for the linear motor elevator and the conditions necessary for its proper operation are discussed. The new results introduced in this paper are in the areas of the design method of the linear motor for multi-car elevator system, and the preliminary results for the position measurement system.

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Basic study of optimal design of linear motor for rope-less elevator

Cited by 12 publications

References 0 publications

A study of linear PMSM driven ropeless elevators

A study of linear PMSM driven ropeless elevators

Simulation and Test Study on Direct Force Control for Permanent Magnet Linear Synchronous Motor

Linear motor for multi--car elevators: design and position measurement

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