一个连续性测试器给电缆导线注入交流信号，从而找到电路故障。
A continuity tester injects an AC signal into the conductors of a cable to find circuit faults.
采用含电机电压模型和电机电感模型的观测器，在低速时注入测试信号，可以得到位置和速度信号。
Position and speed are obtained by an observer using a voltage and an inductance motor model together with test signal injection at low speed.
研究采用高频注入法的无传感器直接转矩控制系统，通过注入特定的高频信号来追踪电机转子的空间凸极效应，以此得到转子位置和速度值。
In the sensorless control system, a specified high frequency signal is injected in to trace the magnetic anisotropy of the motor, by which we can get the value of rotor speed and position.
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