Application of Hall Current Sensor in Variable Frequency Speed Regulation Motor
The use of frequency converters to control the speed of AC motors has been widely used in developed countries around the world, and there is a trend of replacing DC speed control. Using frequency converters to control motor speed can save more than 10% of electrical energy. In frequency converters, the main function of Hall current sensors is to protect expensive high-power transistors. Since the response time of Hall current sensors is shorter than 1μs, when an overload short circuit occurs, the power supply can be cut off before the transistor reaches the limit temperature, so that the transistor is reliably protected, as shown in Figure 43.
Figure 43 Application in variable frequency speed regulating motor
(I, R, S, T are all Hall current sensors)
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