1. Frequency control: When the frequency exceeds the rated frequency of 50Hz, the inverter output voltage remains at 380V. 2. In this case, as the frequency increases, the motor's magnetic field decreases, and the product of the magnetic field and frequency remains constant, showing an inverse relationship. 3. This reduction in magnetic field when frequency is above the rated value is known as weak magnetic speed regulation. 4. Since the rated voltage cannot be changed, the motor's rated power also stays constant, which is referred to as constant power speed regulation. 5. I added the word "rated" in the text, which is crucial for accurate understanding. 6. When the frequency exceeds the rated value, the magnetic field weakens, but the voltage remains constant regardless of the load. 7. The motor current and its running power vary depending on the load—whether it’s no load, light load, full load, or overload. 8. Constant power means that the motor's rated power is fixed, while the actual power depends on the load. The load determines how much power is used. 9. For example, if the load is a fan, increasing the frequency doesn’t increase the power—it remains constant. 10. However, when the frequency exceeds the rated frequency, the fan’s power increases until it reaches the motor’s rated or overload capacity. 11. Operating a fan beyond its rated speed can lead to overload, making it unsafe. 12. If the load is a hoist operating at a constant speed, the torque remains the same, and the power increases with speed, even under weak magnetic speed regulation. 13. As the frequency increases, the motor’s speed and power rise until it reaches the rated or overload condition. 14. Whether the system enters weak magnetic speed regulation depends on the load and speed relationship. Only loads that allow power to increase with speed can enter this mode. 15. The maximum frequency for entering 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 may misunderstand that the load power remains constant and won't overload, but that’s not always the case. 18. Under weak magnetic speed regulation, when the load is full, the speed increases, and the load torque decreases inversely. 19. It’s important to note that not all loads experience a decrease in torque with increased speed—many actually require more torque at higher speeds. 20. Therefore, the maximum frequency for weak magnetic speed regulation for most loads is when the motor’s running power reaches its rated value. 21. It’s not true that once in weak magnetic speed regulation, the motor’s torque automatically decreases with speed. This only happens under specific conditions.
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