Calculation And Analysis Of Temperature Field Of Hybrid Excitation Generator Utilizing Tooth Harmonics For The Excitation

Hybrid excitation generator with tooth harmonic excitation is a new type of hybrid excitation permanent magnet synchronous generator,and the loss and temperature field of the machine are calculated accurately,which is very important for its optimal design.Therefore,this paper mainly focuses on the loss and temperature field of the motor,and the influence of the main design parameters on the temperature of the machine are discussed.The basic structure and working principle of the hybrid excitation generator of tooth excitation are introduced briefly.The calculation method of the loss of each part of the machine is analyzed.The stator and rotor iron consumption,the permanent magnet eddy current loss and the additional loss are calculated by means of finite element software.The influence of the design parameters such as stator slot width,air gap length and permanent magnet thickness on the rotor tooth harmonic electromotive force is analyzed.The results show that when the other design parameters are constant,the larger the stator slot is,the smaller the air gap is,the thicker the permanent magnet magnetization direction,the greater the rotor tooth electromotive force.The influence of these design parameters on the iron consumption of the stator and rotor is also calculated.The results show that the smaller the air gap length is,the thicker the permanent magnet magnetization direction,the greater the iron consumption of the stator and rotor,while the stator slot width is larger,the stator iron consumption is slightly reduced.The two-dimensional temperature field calculation model of the hybrid excitation generator with tooth harmonic excitation is deduced.The method of the combination of Maxwell and Fluent software to calculate the temperature field is adopted.The temperature distribution of stator and rotor are obtained,which can accurately grasp the generator temperature distribution,and calculate the design parameters of the machine temperature.The simulation results show that the temperature of the generator is mainly concentrated in the core and winding of thestator and rotor,which is in good agreement with the actual situation.It verifies the correctness of the calculation of the temperature field,which provides the basis for the optimal design of the machine.