AC motor variable frequency speed regulation-Industrial Control-EEWORLD

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The adjustable power supply composed of LM317 has the following two problems: 1. What is the function of the circuit composed of VQ1 and R3 in the figure? 2. What is the function of VD2 in the picture
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After a circuit board is soldered, when checking whether the circuit board can work normally, it is usually not powered on directly. Instead, follow the steps below to ensure that there are no problem
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AC motor variable frequency speed regulation