Design And Research Of Ferrite PMSM For Washing Machine

With the development of the home appliance industry and people’s living standards,clients are paying more attention to the environmental protection and artificial intelligence of household appliances.In order to effectively save chinese rare earth resources and improve users’ experience of washing machines,research on ferrite motors for high-performance washing machines is an important strategic to promote technological innovation of the washing machine industry and reduce the demand for rare earths.As an important component,washing machine motors need to have high efficiency and low torque ripple.Therefore,the study of high-performance washing machine motors has important significance and engineering application value for promoting the technological progress of washing machines.First of all,this thesis introduces the development background of motors for washing machines,summarizes the characteristics of ferrite PMSM and the current research status in china and abroad.By innovating the rotor topology of the tangentially magnetized SPOKE PMSM,a new type of split SPOKE ferrite PMSM is proposed.The torque pulsation and efficiency of the washing and spining working points of the washing machine are studied,and the correctness of the theoretical analysis is verified by the simulation software ANSYS.The motor designed in this subject has the advantages of high efficiency and low torque ripple,but it has higher requirements for machining accuracy.Secondly,in order to improve the efficiency of the motor,a loss analysis method considering the control method is proposed,which is of great significance to the analysis of the efficiency of the motor having double working conditions.For the purpose of suppressing the torque ripple caused by the field weakening current during high-speed spining operation,combined with the simulation software ANSYS,an analysis method of freezing the static permeability to separate the transient torque is proposed.Based on this method,the key parameters that affect the pulsation component of reluctance torque are extracted,and the torque ripple at the high-speed operating point is effectively controlled to a lower level.To suppress the torque pulsation during low-speed washing operation,genetic algorithm is used to optimize the rotor topology,which achieved effective result.Finally,the optimized design scheme was compared with the initial one of the company in all aspects,which verified the advantage of the motor designed in this subject,and the prototype machine was tested,which proved that the design reached the predetermined goal.