The Calculation Of Parameters Of The Equivalent Circuit Of The Permanent Magnetic Synchronous Motor By Finite-element Method

With the development of permanent magnet materials, the permanent magnet synchronous motor should be applied more and more widely because of its excellent efficiency, such as: high power density, good reliability and efficient conserving energy etc. The equivalent circuit parameters of permanent magnet synchronous motor is an important parameters in designing permanent magnet synchronous motor, as well as important parameters in the research of electric machines' capability. Because of the diversity and complexity of permanent magnet synchronous motor rotor magnetic pole structure, the calculation and the measurement of equivalent circuit parameters is always the emphases and difficulty in the calculation and the measurement of permanent magnet synchronous motor. In this paper, author paid a systemic research into the calculation and the measurement of equivalent circuit parameters. Through compare with the result of the calculation and the measurement, acquire the interesting rule.The thesis is devoted to exploiting study on the calculation and the measurement of permanent magnet synchronous motor. Three parts include as follows:At first, introduce the method of the calculation and the measurement of permanent magnet synchronous motor all of the world. Then introduce a new improved calculation method of equivalent circuit parameters of permanent magnet synchronous motor. The equivalent d-axis state and the equivalent q-axis state will be introduce. The equivalent circuit parameter can be acquire at the equivalent d-axis state and the equivalent q-axis. All of the thing can be finish with Ansoft.Then the permanent magnet motor with several kind of magnetic pole structure will be measure by several methods. The theory, method and data of all of the measurement method of the equivalent circuit parameters of permanent magnet synchronous motor will be show. Bases on the data and experience, acquire the appropriate measurement method of all of permanent magnet synchronous motor. Through the measurement data, acquire the change rule of the equivalent circuit parameters of permanent magnet synchronous motor. In the end sum up the change rule of the equivalent circuit parameters and saliency of permanent magnet synchronous motor with the change of the length of gap and magnetization and the ratio between the number of poles and slot.