Design of Axial and Variable Reluctance Machine and Investigation of It’s Electromagnetic Torque Components Analytically for Electrified and Hybrid Transportation Vehicles
Project no. 31995 · Status: Kapanmış (Yayın bekleniyor) · 2024
Summary
<p>In this project, it will be demonstrated that a variable- and axial-flux reluctance machine with a dual-stator structure and an odd number of rotor tooth steps can reduce mechanical vibration levels by eliminating the unbalanced air-gap electromagnetic stress distribution observed in a single-stator, odd rotor tooth step variable-flux reluctance machine.</p><p>In addition, it will be shown that with the dual-stator configuration, the air-gap flux can be guided through the stator yoke – stator teeth – rotor teeth path, thereby eliminating the need for a rotor yoke structure.</p><p>Accordingly:</p><ol><li data-list="bullet"><span class="ql-ui" contenteditable="false"></span>In hybrid aircraft applications where high reliability requirements prevail, it is possible to rapidly cut off the excitation field winding energy in fault conditions;</li><li data-list="bullet"><span class="ql-ui" contenteditable="false"></span>As both excitation and phase windings are located in the stator, the implementation of a cooling jacket allows for effective and straightforward cooling of the windings;</li><li data-list="bullet"><span class="ql-ui" contenteditable="false"></span>With high torque density, the payload mass — which is critical for economic considerations in aerospace applications — can be minimized;</li><li data-list="bullet"><span class="ql-ui" contenteditable="false"></span>Due to the balanced air-gap force distribution and reduced vibration, the maintenance interval can be extended;</li><li data-list="bullet"><span class="ql-ui" contenteditable="false"></span>With a low number of rotor poles and an excitation field intensity that can be actively controlled, torque production can be sustained at high rotational speeds. Furthermore, the low number of rotor poles enables operation at a lower fundamental electrical excitation frequency, thereby reducing the amplitude and frequency of common-mode noise in the bearings connected to the motor shaft. As a result, the fatigue life of ball bearings can be extended.</li></ol><p>Ultimately, the design and prototyping of an electric motor will be accomplished that provides high reliability, efficient cooling, high torque density, extended maintenance intervals, and longer bearing life, making it highly suitable for hybrid aircraft applications.</p>