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Refinement of outer rotor permanent magnet flux switching machine for downhole application

Kumar, Rajesh (2017) Refinement of outer rotor permanent magnet flux switching machine for downhole application. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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There has been revitalized research interest in permanent magnet flux switching machine (PMFSM), mainly due to number of perceived advantages. Since all active parts such as armature windings and Permanent Magnet (PM) settled on the stator, direct yet suitable machine cooling can be easily associated. Furthermore, extra point of interest such as robust structure, high torque and power density, high efficiency and better flux weakening capability are completely analyzed and validate for different applications. An electric downhole machine should have the basic characteristics of superior reliability & robustness, high torque & power, and efficiency. Recently, a conventional inner rotor PMFSM was applied in downhole application due to high torque and power compared with previously modeled machines. However, it has high PM utilization and low efficiency due high number of turns. Shifting the rotor to the external surface will convey more torque along with easy maintenance, low total weight and cost. This research work is particularly focused on refinement of outer rotor PMFSM with various rotor poles configuration using analytical modeling, optimization based on deterministic method and performance investigation through 2D-FEA. Initially, key parameters for modeling are derived using sizing equations. Then, the various rotor pole configurations of outer rotor PMFSM are modeled and simulated using 2D-FEA JMAG v. 14.1 for the initial performance investigation. Since, 12slot-22pole has shown higher tendency to achieve desired goal of 25 Nm after implementation of refinement techniques. The model is optimized through deterministic method by shifting modeling free parameters in rotor and stator part. As a result optimum machine has accomplished higher output torque and power of 33.57 Nm and 3.84 kW with average efficiency of 94.74%. The PM weight is reduced to 37.3% with temperature stability up to 140oC. Based on these performances, it can be concluded that optimized model of 12slot- 22pole outer rotor PMFSM is one the prominent candidate for the downhole application.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2000-2891 Dynamoelectric machinery and auxiliaries
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 01 Apr 2018 04:06
Last Modified: 01 Apr 2018 04:06
URI: http://eprints.uthm.edu.my/id/eprint/9931
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