Design Analysis of Line-start Interior Permanent Magnet Synchronous Motor

The past 25 years have been a significant period with advances in the development of interior permanent magnet machines. Over this period, line-start interior permanent magnet synchronous motors have expanded their presence in the industrial and domestic marketplace from few specialized niche markets in high efficiency machine tools, household appliances, small utility motors and servo drives to mass-produced automotive applications. A closer examination reveals that several different knowledge-based technological advancements and market forces as well as consumer demand for high efficiency requirements have combined, sometimes in fortuitous ways, to accelerate the development of the improved new small energy efficient motors.;The advances in computing power have seen numerical methods like Finite Element Analysis (FEA) being employed in various design problems of interior permanent magnet (IPM) motors. This thesis presents the design, analysis and simulation of line-start IPM synchronous motors. Analytical derivations are provided. Taking into account inherent advantages of numerical methods like FEA for optimum design, shape and orientation of IPM motors, simulation codes for Laboratory IPM motors are presented. Three sets of rotors for the IPMSM are analyzed using time-stepping FEA. This works provide cost effective simulations. The simulated results are compared with those published in the literature for verifications.;Compared with squirrel-cage induction machines, line-start permanent magnet machines have high efficiency and high power factor because they exhibit two torque components namely the permanent magnet torque and the reluctance torque. Though the stator of a permanent magnet motor is the same as that of an induction motor, numerous configurations are possible in term of the ways the permanent magnet is placed in the rotor. In order to find the optimized structure, line-start permanent magnet synchronous machines with different rotor structures will be comparatively studied in terms of dynamics and steady state performance and transient process with finite element method.