1. Frequency control: When the frequency exceeds the rated frequency of 50Hz, the inverter output voltage remains constant at 380V. 2. During frequency control, if the frequency goes beyond 50Hz, the inverter output voltage is kept at 380V. As the frequency increases, the motor's magnetic field decreases, and the product of the magnetic field and frequency remains constant, meaning they are inversely proportional. 3. When the frequency exceeds the rated value, the magnetic field weakens, which is known as "weak magnetic speed regulation." 4. Since the rated voltage cannot be changed, the motor’s rated power also remains constant, referred to as "constant rated power speed regulation." 5. You might have noticed that I added the word "rated" in the text—it plays a crucial role in understanding the concept. 6. When the frequency exceeds the rated frequency, the magnetic field weakens, but the voltage stays constant regardless of the load. 7. The motor current changes based on the load, and so does its operating power. The motor may run under rated, light load, full load, or even overload conditions. 8. Constant power means the motor’s rated power is fixed, while the actual power depends on the load. The load determines how much power it needs. 9. For example, if the load is a fan, the power increases with speed. Even in weak magnetic speed regulation, the power doesn’t stay constant. 10. When the load is a fan, increasing the frequency beyond the rated level causes the load power to rise until it reaches the motor’s rated or overload power. 11. For a fan, exceeding the rated speed can lead to overload, making the operation unsafe. 12. If the load is a hoist running at constant speed, torque remains the same, and power increases with speed. However, even in weak magnetic speed regulation, the power doesn’t stay constant. 13. When hoisting at constant speed, if the frequency goes above the rated value, the motor’s speed increases, and the power rises until it hits the rated or overload levels. 14. Whether the frequency converter enters the weak magnetic speed regulation zone depends on the relationship between the load and the speed. Only when the load power increases with speed or reduces, can the system enter this mode. 15. The maximum frequency for entering the weak magnetic speed regulation is the point where the load power reaches the motor’s rated power. 16. Once in the weak magnetic speed regulation zone, the motor current still depends on the load, which could be no load, light load, full load, or overload. 17. Some people mistakenly believe that once in weak magnetic speed regulation, the load power is fixed and won’t cause overloading. That’s not correct. 18. According to the requirements of weak magnetic speed regulation, when the motor is fully loaded, increasing the speed causes the load torque to decrease inversely. 19. Not all loads experience a reduction in torque when speed increases. In fact, many loads require more torque at higher speeds. 20. Therefore, the maximum frequency for weak magnetic speed regulation in most loads is when the motor’s operating power reaches its rated capacity. 21. It’s important to understand that entering weak magnetic speed regulation doesn’t automatically reduce the motor’s torque. The torque behavior depends on the specific load characteristics.
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