High linearity electromagnetic actuator using double closed rectangular magnetic circuits for active vibration isolation

Electromagnetic actuators that produce high linearity driving force are key components in active vibration isolation. In this paper, a design of high linearity electromagnetic actuator is proposed. Scheme of double closed magnetic circuits is used to ensure the linearity of magnetic flux density and rectangular structure is adopted to ensure the processing and assembly precision. The magnetic circuits of electromagnetic actuator are modeled using lumped parameter magnetic circuit modeling method, validated by simulation, and optimized to obtain improved performance. Experimental results show that magnetic flux density of 293.2mT and non-linearity of 0.37% is achieved.