The diverse measurements and calculations for asynchronous motor load rate are mentioned and some examples are given to illustrate the limitations of electric current method.

介绍了电动机负载率的几种不同测算法，并举例说明电流法应用的局限性。

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Introduces the magnetic scalar potential method solving boundary-value problems of magnetic field generated by steady electric current is introduced.

介绍了用磁标势求解稳恒电流磁场边值问题方法、步骤。

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The principle of electric eddy current sensors is introduced. The method to measure displacement using an electric eddy current sensor is given.

本文简单介绍了电涡流传感器的原理，给出了利用电涡流传感器测量位移的方法。

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