| Summary: | 碩士 === 逢甲大學 === 電機工程學系 === 89 === The purpose of this thesis is to design and analysis interior permanent magnet (IPM) synchronous motors for adjustable-speed applications. To provide satisfactory engineering information but at small computational effort, a combination of the magnetic circuit model and the finite element analysis is employed.
In the first part of this thesis, a design procedure of the IPM synchronous motors is developed. It has been used to design a prototype motor for use in this study.
Then the magnetic circuit model taking into account leakage flux paths around the magnets in the rotor for an IPM synchronous motor has been presented. The analytical expressions of the magnetic field quantities in terms of the reluctance ratio and the leakage flux ratios provide the solutions in extremely short times. Each field quantity of the model can be evaluated directly from the dimensions and material properties of the motor and thus can be easily and suitable incorporated into the motor magnetic design.
The finite element field analysis is employed to verify the accuracy of the magnetic circuit model and to refine the prototype design. The prediction of the performance of the designed motor using the finite element method is also described. The cogging torque, torque, open circuit EMF and air gap flux density are obtained. Especially, the reactances are obtained as a function of current.
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