|
In this thesis, it studies and designs a 12/10 poles structure and three-phase switching flux permanent magnet motor, which belongs to one of a new type of saliency permanent magnet motor. But its permanent magnets are embedded stator teeth. It inherits switch reluctance motor merits, including simple structure and high reliability etc. It also has the characteristics of permanent magnet motor with high efficiency and high torque density etc. While, this type of motor also effectively overcome the weakness of switch reluctance motor, such as control complex and large noise. Therefore, in recent years, more and more researchers focus on this kind of motor.Firstly, it analyzes running mechanism of the motor in detail. And then, it deduces mathematical model of three-phase switching flux permanent magnet motor through magnetic circuit, fundamental equation of electric circuit, mechanical equation, mechanical electrical contact equation, flux equations and voltage equation.Secondly, in according to the special structure and characteristics of switching flux permanent magnet motor, it puts forward the basic design requirements of the motor and analyzes detailedly how to select the motor materials, magnetic circuit structure and size ratio. Meanwhile, it calculates the permanent magnets operating point, magnetic circuit and windings. At last, it gets a set of reasonable electromagnetic scheme.Thirdly, using field-circuit coupled method, it can analyze and calculate EMF, phase current, cogging torque, local saturated of 12/10 poles switching flux permanent magnet motor. Through constructing simulation control circuit and ansoft magnetic field analysis software, it can accurately simulate this motor operation from start to stable process and then get rated torque waveform, transient speed waveform and driving voltage waveform, etc.Finally, it analyzes the cogging torque of switching flux permanent magnet motor. Because of saliency structure in stator and rotor, the cogging torque is larger, so how to reduce the cogging torque is the key of design. In this article, it is from two aspects of permanent magnets width and air gap length to analyze cogging torque value under different sizes. Under the premise of the guarantee performance, it can find the reasonable values of permanent magnet width and air gap length. Through prototype manufacture, it proves theoretical analysis and simulation is true.
|