With the advent of power electronics, control technology, and microelectronics, great progress has been made in motion control and drive applications. AC drives are replacing the long-existing DC drives. As permanent magnet (PM) materials have improved rapidly for the past two decades, PM machines have become a powerful competitor as the motor of choice for AC drives, especially for small power rating range due to their high power density and efficiency. Recent research and development on Variable Reluctance Machines (VRM) have shown that with their doubly salient structure and concentrated windings, with proper current control, VRMs have high torque capability in addition to low cost and robustness.; Combined with the merits of both PM machines and VRMs, doubly salient permanent magnet machines (DSPM machines) have simple and robust structure, good manufacturability. They also have the potential of having high power density and efficiency.; In this dissertation, a dual stator, doubly salient permanent magnet motor is investigated. By shifting the two stator for 90 electrical degrees, a two phase stator winding is formed. This configuration serves to add the PM torque created by the two stators, but cancels the reluctance torque to a large extent, because the reluctance torque produced by two phase winding are out of phase. A theoretical analysis of the operating principle is carried out. A finite element analysis and dynamic simulation are made to support the theoretical analysis results. The magnetic circuit model is developed to facilitate machine design. The design procedure and optimization method are also presented. A prototype motor has been built and tested. Based on the test results, the further improvement and optimization are discussed.
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