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Description
As a vertical transportation apparatus for moving people and goods between floors, the elevator or lift plays an increasingly important role in the high-rise buildings. The requirements for fast velocity, comfort ability, reliability and safety issues become higher and higher. Due to its inefficiency and complicated operating system, the conventional cable elevators, which usually utilize rotational drives and hoist cables with counterweights, are no longer acceptable. By using the linear motor for propelling the elevator car, it can travel smoothly from standstill to high speed while eliminating the cables and counterweights. Hence, the efficiency, stability and reliability can be significantly improved. Linear induction motor (LIM), linear synchronous motor (LSM), and linear switched reluctance motor (LSRM)are applied for cableless elevators in recent years. For the reliability and safety concerns, LIMs and LSRMs which possess rugged and passive moving parts are favorable. The purpose of this paper is to propose a doubly-fed doubly-salient HTS linear motor (DFDS-HTSLM) for linear drives in the cableless elevator. The proposed linear motor possesses the advantages of both LSRM and LSM. It adopts a doubly-salient structure which is very similar to the LSRM. By equipping the HTS field winding for providing the field excitation, a higher thrust density can be achieved. Moreover, by adopting 5-phase armature design, the high fault-tolerance capability can be realized. With these merits, the proposed DFDS-HTSLM not only provides a high thrust density with flexible thrust control, but also can achieves higher reliability with fault-tolerant operation. By coupling the finite element method model of the proposed linear motor with the circuit simulator, the transient characteristics of the proposed motor will be performed at both the accelerating and decelerating conditions. This work is supported by a grant (Grant No. 51607114) from the National Natural Science Foundation of China.
| Submitters Country | China |
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