Studies On Novel Transverse Flux Permanent Magnetic Propulsive Motor

Propulsive motor is the core of ship's integrated power propulsion systems. Transverse flux permanent magnetic (TFPM) motor has low speed, high torque density, and is suitable for direct electrical propulsion. TFPM motor is one of the research areas of electrical propulsive motor. In this dissertation, a novel structure transverse flux permanent magnetic propulsive (TFPMP) motor is presented. The electromagnetic parameters and performances of this motor are analyzed in detail. The main research results are as below.Based on the analysis of existing topology structures of TFPM motor, a novel structure TFPMP motor with concentrating flux rotor configurations is presented. The motor has three-side concentrating flux rotor permanent magnetic (PM) poles, and the stator cores are made up of U-shaped silicon steel sheets. This kind of structure simplifies stator core manufacture and increases air-gap magnetic flux density. Based on the structure of the motor, the principle of TFPM is discussed and the design formulas of the novel TFPMP motor are given.The magnetic circuit structure model of the novel TFPMP motor is presented. Following the analysis of the magnetic circuit structure, cyclic current method is applied to the magnetic circuit analysis. Considering the magnetic conductance and magnetic potential of each branch, cyclic flux method is used to analyze and calculate the magnetic circuit. According to the results of magnetic circuit analysis, the flux linkage curves of stator windings caused by rotor PM poles under no-load condition are gained. The harmonic analysis of flux linkage curves under different stator core thickness is important to choose the proper stator core thickness.The 3-D finite element analysis (FEA) model of the novel TFPMP motor is built. Using the FEA model, the magnetic field distribution of the motor under no-load conditions is calculated. The inductive electromotive force under no-load conditions is gained. The inductances of stator windings are calculated by FEA and magnetic circuit analysis method.Based on the analysis of electromagnetic parameters, the way to calculate the d -axis and q -axis inductances of the novel TFPMP motor is discussed. The results uniform the d - q -axis coordinate transformation matrixes between the novel TFPMP motor and traditional radial flux motor. The power factor characteristic of the motor is analyzed and the relationship between the structure of the motor and power factor is discussed. The performances of the novel TFPMP motor are calculated. The calculated values agree well with measured values. The results validate that the novel structure of TFPMP motor is feasible and the analysis method presented in this thesis is correct.