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This post was last edited by Yamei on 2018-11-21 at 17:01. I believe many people have heard of variable-frequency power supplies by now; I’ve written a lot of information about them before. Today, let’s talk about speed control using variable-frequency power supplies. There are three methods for controlling the speed of AC motors: pole-changing speed control, slip-rate variation speed control, and variable-frequency speed control. Among them, variable-frequency speed control has the greatest advantages. Here, only a comparison is made between AC variable-frequency speed control systems and DC speed control systems. What are the advantages of using an inverter-powered drive for speed control? 1. It provides good smoothness during speed adjustment and high efficiency. At low speeds, the characteristic quench rate is high, resulting in good relative stability. 2. During constant-torque speed control, the overload capacity of the motor in the low-speed range is significantly reduced. 3. It has a wide speed control range and high precision. 4. It has a low starting current, causing no impact on the system or power grid, and offers significant energy-saving effects. 5. Easy to automate the process. 6. A dedicated variable-frequency power supply|stabilizer is required, which is relatively expensive. 7. The variable-frequency power supply is compact in size, making it easy to install, debug, and maintain. These are the advantages of using variable-frequency power supplies for speed control; I hope they will be helpful to everyone. The variable-frequency power supply uses a voltage regulator to control the speed; this is done first to adjust the speed according to requirements, and secondly for energy savings.