Design And Implementation Of An Inertial Actuator

Inertial actuator has the characteristics of low harmonic distortion,good linearity,easy installation and compact structure,which has broad application prospects as an actuator in active vibration control system.In practical engineering applications,inertial actuators not only have high reliability,but also require large force output per unit weight.At present,the technology of domestic inertial actuator is not mature,and it is expensive to import from abroad.Therefore,the development of an actuator with high power density and high reliability has become an urgent problem to be solved in active vibration control system.Based on this background,an inertial actuator with large output force and high reliability is designed and analyzed in detail.The actuator developed has low heat consumption and does not need forced heat dissipation;the leaf spring is made of stainless steel,which is not easy to creep,can work for a long time and has high reliability.This work has laid a foundation for the development of more powerful high power density inertial actuators.The main research contents are as follows:The magnetic circuit and suspension systems of the inertial actuator are designed respectively.The overall structural design of the inertial actuator is proposed by considering a series of structural elements such as different magnetic circuit configuration,coil series parallel scheme,permanent magnet arrangement,skeleton and shell installation,plate spring connection and so on.Based on the Ampere's molecular circulation hypothesis,the surface current model of the permanent magnet is derived.The insufficient precision of analytical magnetic field model of inertial actuator is discussed,and the electromagnetic model and electromagnetic force model of permanent magnet are established.The electromagnetic model was analyzed from the outer annular permanent magnet.The expressions of radial magnetic induction intensity and electromagnetic force at the time gap of axial and radial magnetization were deduced by using the superposition theorem.The theoretical analytical curve is drawn.At the same time,the electromagnetic model is verified by COMSOL,and the theoretical analytical curve is consistent with the simulation curve,which preliminarily confirms the correctness of the expressions of magnetic induction intensity and electromagnetic force.The size parameters of inertial actuator are designed and optimized.Considering these main structural parameters such as magnetic circuit system size,coil parameters,resistance heat consumption and selection of novel plate spring structure,the parameter size of inertial actuator is determined.Moreover,the actuators are tested by a self-designed experimental device.The experimental results show that the magnetic induction intensity and electromagnetic force of the actuator meet the design requirements.The theoretical analytical curves of the magnetic induction intensity and electromagnetic force are in good agreement with the simulation curves,which further verifies the correctness and accuracy of the electromagnetic model.