Abstract
Permanent magnet linear synchronous motors (PMLSM) has the advantages of high speed, high thrust density, high power density, high power factor and high reliability. In order to save permanent magnet (PM) materials and reduce magnetic leakage, a new type of PMLSM with Halbach consequent-pole (HCP) structure is presented, which has great potential for application to the ropeless elevator system. By using extensive finite element analysis (FEA), the electromagnetic properties of the proposed HCP-PMLSM, including magnetic field, back electromagnetic force (back-EMF), thrust force and cogging force are simulated and compared with the consequent pole PMLSM (CP-PMLSM) and surface-mounted pole PMLSM (SP-PMLSM). The comparison results show that the proposed HCP configuration can reduce substantial PM material and increase the air-gap magnetic field effectively. Then, the influence trend of HCP parameters such as pole thickness, pole width ratio, auxiliary PM width and magnetism angle, are studied and analyzed for evaluating the output performance in HCP-PMLSM. On this basis, Response surface method (RSM) is employed to optimize the HCP parameters with the target of maximum average thrust, minimum thrust ripple, and highest PM utilization. Furthermore, a double-sided pole shift method was proposed to significantly suppress the thrust fluctuation of HCP-PMLSM. Lastly, experimental results are provided to verify the investigation.
Highlights
With the emergence of high-rise and super high-rise skyscrapers, the traditional elevator driven by rotary motor through counterweight is no longer applicable
In order to improve the problems of the aforementioned Consequent pole (CP) motors, we propose a new Halbach consequent-pole (HCP) structure for Permanent magnet linear synchronous motor (PMLSM)
In the analysis model of SP-PMLSM, the least common multiple (LCM) value is 240 and the period of cogging force obtained from equation (1) is 1.5 mm
Summary
With the emergence of high-rise and super high-rise skyscrapers, the traditional elevator driven by rotary motor through counterweight is no longer applicable. In order to achieve independent control of multiple cars without winding switching, the ropeless elevator scheme generally adopts the secondary PM plates of PMLSM to be laid along the entire hoist way track, and the primary winding moves with the car. While, this scheme needs a large amount of PM materials and leads to the cost increase for PMLSM. X. Xu et al.: Pole Optimization and Thrust Ripple Suppression of New HCP PMLSM diagnosis [16]–[18] on special electrical machines, all of which are mainly focused on improving performance and reducing costs. The validity of these analyses is confirmed by prototype experimental results
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