In a precision active isolator, Lorentz motors (LM), a permanent magnet linear synchronous motor (PMLSM), often are used as an actuator. As a key equipment, the performance of the precision active isolator is directly affected by the LM. In the design of LM, many factors must be considered, a comprehensive analysis including active isolation system, structural dynamics, magnetic field and cooling, should be integrated to optimize a LM. First, a dynamical model about an active isolator is built. A measurement method of eccentricity in the precision active isolator is presented for the LMs. A simple decoupling magnetic equivalent circuit (MEC) is proposed to predict MFD distribution of the air-gap in the design of LM, and an water cooling system is presented and analysed. Finally, an optimization combining effective cost function is used to find the optimal motor dimensions. The performance of the optimized LM is described by simulation and experimental results, which also confirm effectiveness of the optimized design.
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