Analysis on Irreversible Demagnetization Condition of Linear Oscillatory Actuator with Moving Magnets
In this paper, a linear oscillatory actuator with moving magnets used in active engine mount is modeled and theoretically analyzed considering its performance decline at high temperature. Firstly, a finite element model of the linear oscillatory actuator with moving magnets is established. The actuator force is decomposed to ampere force and cogging force through formation mechanism analysis. By using the finite element model, ampere force and cogging force of the linear oscillatory actuator with moving magnets under different current loads and different mover positions are calculated. The finite element model and calculation method are validated by bench level test. The voice coil constant and cogging coefficient at room temperature are identified, which indicates the actuator force is a linear model related to the current and the mover position.