According to the principle of virtual-work, the formula of electromagnetic force based on magnetic vector potential is deduced.
根据虚位移原理，推导出基于矢量磁势的电磁力计算公式。
The prestress method is tried to be used to solve the problem of magnetic tensile force and lateral vibration on a turbo_generator rotor and the calculating formula is presented.
探讨了采用预应力法求解发电机转子磁拉力与弯曲振动问题的可行性，导出了有关的计算公式。
At first, the asynchronous steady state of LPMLSM is analyzed, the formula of magnetic force under this state and the influences on motor starting is deduced in theory.
首先对低速永磁直线同步电机的异步稳态运行状态进行了分析，从理论上推导了异步稳态的电磁力的公式以及它对电机起动特性的影响。
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