Fairul Azhar Abdul Shukor

Design and Performance Index Comparison of the Permanent Magnet Linear Motor

In this paper, a cylindrical permanent magnet linear motor (PMLM), which has a high performance, was designed and developed, because the motor has a zero normal force and a higher thrust density. The structure of the motor plays a vital role at the stage of design. During the design stage, several models of the PMLM that had different structural parameters were simulated using FEM software, and the model that produced the high-performance was identified. The structural parameters involved include the radius and height of the permanent magnet, rpm and hpm, the height of coil, hc ,a nd the shaft radius, rs, within a fixed total radius, rtotal. To prove its high-performance characteristics, the performance of the PMLM was then compared to the commercialized PMLM using four performance indexes which are thrust F , thrust constant kf , motor constant km and motor constant square density G. About 200 commercialized PMLMs with three different types have been chosen which are the slot type PMLM, slotless type PMLM and shaft motor. Based on the comparisons, the designed PMLM had a better performance than the commercialized PMLM. In order to validate the simulation result, the PMLM was manufactured. The simulation and measurement static thrust characteristics were then compared, and it was found that the simulated thrust had a good agreement with the measured one.

Performance Characteristics of Non-Arc Double Stator Permanent Magnet Generator

The improvement in the power density in the double stator configurations is feasible with increase in the electrical loading of the electrical machines. This type of newer configuration is finding significant applications in improvising energy generation, more commonly for renewable energy generation. Various double stator configurations with non-arc permanent magnet machines for power density are modelled and analyzed in this paper. Finite Element Method (FEM) is used to simulate for the generation capability including the electromagnetics parameters such as flux linkage and open circuit voltage. A new slotted rotor structure is evolved based on the magnetic flux flow control inside the machine. The proposed structure is then fabricated in the laboratory and tested for operating characteristics with load circuit. The proposed machine produces a maximum power of 600W at speed of 2000 rpm with 75% of maximum efficiency with the micro-hydro generation unit.

Design of Permanent Magnet Linear Synchronous Motor Stator to Improve Magnetic Flux Density Profile Toward High Thrust Density Performance

The Permanent Magnet Linear Synchronous Motor (PMLSM) is designed in this paper to solve the drawbacks of the previous designed PMLSM. The previous designed PMLSM has magnetic flux density, B saturation at lower rated current, I. Therefore, to overcome the saturation of the magnetic flux density, the stator of the PMLSM is designed. Apart from that, the design of the stator help to increase the ratio of thrust, F to cogging force, F cog. The design of PMLSM is completed in two stages where in the first stage the best model chosen is the model of t y2 = 3 mm. The thrust of the model has reduced by 14% from the previous designed PMLSM. The model designed and chosen in second stage is compared with the previous designed PMLSM in terms of it performance index. The designed PMLSM has improved in terms of motor constant square density, G compared to the previous designed PMLSM with the increment of 2%.